WO2025087259A1 - Plume-abatement cooling tower and plume-abatement packing unit thereof - Google Patents

Abstract

The present invention relates to the field of cooling towers. Disclosed are a plume-abatement cooling tower and a plume-abatement packing unit thereof. The plume-abatement packing unit comprises a plurality of heat exchange sheets which are stacked, and dry cold airflow channels and wet hot airflow channels which are alternately distributed along a stacking direction and capable of realizing inter-wall heat exchange by means of the heat exchange sheets. The lower part of each heat exchange sheet is formed as an inverted trapezoidal structure, and adjacent heat exchange sheets are alternately sealed and connected at inclined edges on two sides of the inverted trapezoidal structure, so that dry cold airflow inlets in communication with the dry cold airflow channels and wet hot airflow inlets in communication with the wet hot airflow channels are alternatively formed on two opposite sides, and liquid collection outlets in communication with the wet hot airflow channels are formed at bottom short edges. Water collection and guide structures capable of guiding at least part of water carried in an airflow entering from the wet hot airflow inlets and/or generated by condensation of the airflow to the liquid collection outlets are formed on the sides of the heat exchange sheets facing the wet hot airflow channels. The plume-abatement packing unit can effectively improve the plume abatement effect.

Description

Demisting cooling tower and demisting filler unit

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of Chinese patent application 202311380107.9 filed on October 23, 2023, the contents of which are incorporated herein by reference.

Technical Field

The present invention relates to the field of cooling towers, and in particular to a demisting filler unit. Based on this, the present invention also relates to a demisting cooling tower comprising the demisting filler unit.

Background Art

In the petroleum, chemical and other industries, circulating water cooling systems are widely built. Traditional open cooling towers use water-spraying fillers to cool circulating water. The circulating hot water from the process device enters the cooling tower spray system, and forms spray circulating hot water through the water-spraying nozzle. The spray circulating hot water enters the water-spraying filler from top to bottom. The filler is generally made of PVC sheets. Water enters the filler and forms a water film along the PVC sheet. The dry and cold air from the outside enters the filler from bottom to top, and exchanges heat with the water film. The water film evaporates and cools down. The air is heated and humidified to form hot and humid air. A fan is installed on the top of the cooling tower to discharge the hot and humid air out of the tower, and the circulating hot water is cooled and turned into circulating cold water. The hot and humid air coming out of the top of the water-spraying filler is discharged out of the tower through the cooling tower wind tube. Because the hot and humid air discharged out of the tower is high in humidity and temperature, when the ambient temperature is low, the hot and humid air is discharged out of the tower and mixed with the cold air. Due to cooling and condensation, a fog containing many tiny liquid particle groups is formed.

The water contained in the mist of the above-mentioned micro-liquid particle group is the water evaporated from the cooling tower water filling. This water contains very little or almost no salt. At the same time, chemical plants, steel plants and other enterprises equipped with a large number of cooling towers generally have desalted water production equipment, which uses specific technical means to remove the salt in industrial water at a high cost and high energy consumption, thereby producing desalted water. The cooling of circulating water by the cooling tower depends on the evaporation of circulating water on the water filling. The steam gas evaporated from the top of the water filling is salt-free. The demisting unit of the ordinary demisting cooling tower recovers part of the gas evaporated from the water filling, and the spray droplets containing salt entrained by the hot and humid air in the process are also collected and mixed and returned to the tower. The waste of low-salt or salt-free evaporated water by the cooling tower is in sharp contrast to the high cost and high energy consumption of obtaining desalted water in the factory.

Typically, the existing demisting environmental protection device may include a tower body, in which fillers, water sprayers, water collectors, and heat exchangers are arranged from bottom to top in sequence, an air outlet is arranged at the top of the tower body, a fan is installed in the air outlet, and a transition section air chamber is arranged in the tower body between the heat exchanger and the air outlet. During operation, the hot circulating cooling water sprayed by the water sprayer is cooled by the cold air entering through the lower air inlet of the cooling tower in the fillers, and the temperature of the circulating cooling water decreases; the temperature of the cold air in the fillers increases, and the moisture content increases, forming humid hot air that is basically in a saturated state; the humid hot air enters the hot air channel after passing through the water collector, and then enters the heat exchanger to exchange heat with the dry cold air entering the heat exchanger through the cold air channel; after passing through the heat exchanger, the humid hot air and the dry cold air are mixed in the transition section air chamber and discharged into the atmosphere by the fan.

The main deficiencies of the above-mentioned prior art are: 1. The heat exchange device in the demisting and environmental protection device is the main demisting facility. The heat exchange device is equipped with a diamond-shaped demisting filler group. The running speed of the cold air and hot air in the filler group is high, which is 1.414 times the average wind speed of the cooling tower cross section. The running resistance is high. Affecting the performance of the entire cooling tower. 2. The heat exchange device in the demisting and environmental protection device has a limited heat exchange area under a certain pressure drop requirement, low heat exchange efficiency, and poor water collection effect. 3. The heat exchange device in the heat exchange and demisting device has a triangular support at the bottom of the demisting filler group, which has low strength, and there is cold air and hot air on both sides. It needs to be fully packaged and installed, and the packaging and installation costs are high. 4. The heat exchange device in the heat exchange and demisting device has a demisting filler group composed of heat exchange plates, and the heat exchange plates are thin film structures. The demisting filler group is large in size and has low structural strength. It is not difficult to install large-size demisting fillers. 5. The demisting environmental protection device is provided with a damper above the water collector, and a height of at least one damper rotation radius is reserved between the damper and the water collector. The inverted tower body is high in height and the cost is high. 6. Condensate with less salt cannot be effectively distinguished and recovered.

In another prior art, a demisting device and a cooling tower are provided, wherein the demisting device comprises: a stacked first flow path and a second flow path, heat exchange between the first airflow and the second airflow flowing from bottom to top; the first airflow flowing out of the first flow path is discharged to a first outlet above the demisting device; the second airflow flowing out of the second flow path is discharged to a second outlet above the demisting device; and the first outlet and the second outlet are alternately stacked, and the demisting device can play a role in water-saving demisting. The cooling tower comprises the demisting device as above.

The main deficiencies of this prior art are: 1. A water collector is required when the demisting tower is in use, which increases the cost of the demisting tower. 2. The spray droplets carried by the moist and hot air are mixed with the condensed water recovered by the demisting device, and no separation is achieved. The salt-free (low-salt) condensed water is not recycled separately. 3. The bottom of the packing is a two-stage structure. The condensed water recovered by the demisting device flows back into the tower from the air inlet of the demisting device by gravity. At the same time, it is a drainage outlet, forming a mainly countercurrent form. This process is prone to gas-liquid entrainment. The condensate recovered by the demisting device is entrained again into the demisting device or leaves the demisting device, causing the demisting effect to decrease.

Summary of the invention

The purpose of the present invention is to overcome the problem in the prior art that condensed water recovered by the defogging packing unit is easily entrained into or leaves the defogging unit, thereby causing poor defogging effect, and to provide a defogging packing unit that can effectively improve the defogging effect.

In order to achieve the above-mentioned purpose, the present invention provides a defogging packing unit on one hand, comprising a plurality of heat exchange plates arranged in a stack, the side edges of adjacent heat exchange plates being sealed and connected to each other, so as to form dry cold air flow channels and moist hot air flow channels which are alternately distributed along the stacking direction and can exchange heat through the walls between the heat exchange plates, the lower part of the heat exchange plate is formed into an inverted trapezoidal structure, and the adjacent heat exchange plates are alternately sealed and connected at the oblique sides of the inverted trapezoidal structure, so as to alternately form a dry cold air flow inlet connecting the dry cold air flow channel and a moist hot air flow inlet connecting the moist hot air flow channel on the two opposite sides, and form a liquid collection outlet connecting the moist hot air flow channel at the bottom short side, and the side of the heat exchange plate facing the moist hot air flow channel is formed with a water collecting and guiding structure which can guide at least part of the water carried in the air flow entering from the moist hot air flow inlet and/or generated by the condensation of the air flow to the liquid collection outlet. Wherein, the bottom short side of the inverted trapezoidal structure of the heat exchange plate can be horizontal.

Preferably, the water collecting and guiding structure includes a guiding protrusion protruding from the heat exchange plate into the humid hot air flow channel, and the guiding protrusion includes an oblique guiding protrusion extending intermittently upward in the inverted trapezoidal structure along the direction of the air flow from the humid hot air flow inlet to the humid hot air flow channel. The condensed water generated by the condensation of the air flow entering the humid hot air flow inlet can be guided by the oblique guiding protrusion and fall to the liquid collection outlet through the gap between adjacent oblique guiding protrusions. The protrusion height of the guiding protrusion can be one quarter to three quarters of the thickness of the humid hot air flow channel, preferably half.

Preferably, the water collecting and guiding structure further comprises a vertical guiding protrusion extending vertically upward from the top of the oblique guiding protrusion, and the guiding protrusion abuts against another adjacent heat exchange plate in the hot and humid air flow channel.

Optionally, the water collecting and diverting structure includes a parallel fold structure formed on the main body portion of the heat exchange plate located above the inverted trapezoidal structure, and adjacent heat exchange plates are formed in the main body portion to have upper fold areas extending parallel to each other, so that the airflow entering from the hot and humid air flow inlet is repeatedly folded when flowing through the upper fold area.

Preferably, the water collecting and guiding structure includes a baffled water collecting structure formed at the heat exchange plate near the hot and humid air flow inlet and extending in a direction parallel to the hypotenuse of the inverted trapezoidal structure on one side of the hot and humid air flow inlet, and the baffled water collecting structure is formed so that the airflow entering from the hot and humid air flow inlet changes its flow direction in the hot and humid air flow channel and guides the spray water carried in the airflow to the liquid collection outlet. The height of the baffled water collecting structure can be close to or exceed the thickness of the hot and humid air flow channel, preferably 0.7 to 2 times the thickness of the hot and humid air flow channel, and more preferably 0.9 to 1.1 times.

Preferably, the demisting packing unit further comprises a water collecting tank disposed at the lower side of the heat exchange plate and opposite to the short side of the bottom of the inverted trapezoidal structure. The water collecting tank may have a condensed water collecting area for collecting condensed water generated by condensation of the airflow entering the humid hot airflow inlet and a spray droplet collecting area for collecting spray water carried in the airflow entering the humid hot airflow inlet, and the spray droplet collecting area is separated from the condensed water collecting area.

Preferably, adjacent heat exchanger plates form liquid seals at the short sides of the bottom, which are connected to the dry cold air flow channel and are alternately distributed with the liquid collection outlet along the stacking direction of the heat exchanger plates, and the side of the heat exchanger plates facing the dry cold air flow channel is formed with the same water collecting and guiding structure as that in the wet hot air flow channel, and the water collecting and guiding structure is configured to guide at least part of the water carried in the air flow entering from the dry cold air flow inlet and/or generated by the condensation of the air flow to the liquid seal. The baffled water collecting structure is arranged along the wet hot air flow inlet and obliquely points downward to the liquid collection outlet arranged at intervals of the heat exchanger plates, or is arranged along the wet hot air flow inlet and the dry cold air flow inlet and obliquely points downward to the liquid collection outlet and the liquid seal arranged at intervals of the heat exchanger plates. That is, the baffled water collecting structure is arranged in the wet hot air flow channel for guiding and collecting condensed water, and the dry cold air flow channel basically does not produce condensed water, so the baffled water collecting structure may be provided or not. During operation, the liquid level of the water in the water collecting tank exceeds the edge of the short side of the bottom of the inverted trapezoidal structure, so as to achieve the isolation of the cold and hot air flows.

In the above preferred scheme, the liquid collection outlet and the liquid sealing port are all open structures, that is, the liquid collection outlet is connected to the hot channel, and the liquid sealing port is connected to the cold channel. It can be open over the entire length of the bottom short side of the inverted trapezoidal structure to form a fully open structure, or only a semi-open structure.

Preferably, the top edge of the heat exchange plate is formed as a horizontal straight edge or a plurality of downwardly concave edges, and adjacent heat exchange plates form cold channel outlets that are alternately distributed along the stacking direction and connected to the dry cold air flow channel and hot channel outlets that are connected to the wet hot air flow channel over the entire length area of the top edge.

Preferably, the top edge of the heat exchange plate extends along the wave line and adjacent heat exchange plates are connected to each other at the wave crest/wave trough positions, so as to form cold channel outlets that are alternately distributed along the stacking direction and connected to the dry cold air flow channel and hot channel outlets that are connected to the wet hot air flow channel over the entire length area of the top edge, and the cold channel outlets and the hot channel outlets form a honeycomb-shaped top outlet.

Preferably, columnar supports are formed on the heat exchange fins, extending in the dry cold air flow channel and/or the wet hot air flow channel and abutting against adjacent heat exchange fins.

In the present invention, the material of the heat exchange plate can be selected from PVC, PP or similar film composite materials, preferably PVC thermal conductive plastic.

The second aspect of the present invention provides a demisting cooling tower, which includes a tower body and a demisting packing layer, a spray unit and a water sprinkling packing layer arranged from top to bottom in the tower body, the demisting packing layer includes a plurality of groups of demisting packing units according to any one of claims 1 to 9 connected to each other at the side, the tower body is formed with a cooling tower air inlet located at the lower side of the water sprinkling packing layer and a plurality of dry cold air channels located between the demisting packing layer and the spray unit and connected to the dry cold air flow inlet respectively, and a humid hot air channel is provided between adjacent dry cold air channels to allow the spray liquid evaporated from the water sprinkling packing layer to flow to the humid hot air flow inlet.

Through the above technical scheme, at least part of the moisture carried in the airflow introduced through the humid and hot air flow inlet and/or generated by the condensation of the airflow can be guided by the water collecting and guiding structure to the liquid collection outlet formed at the bottom short side of the inverted trapezoidal structure of the corresponding heat exchange plate, thereby avoiding the condensed water recovered in the defogging packing unit from forming a countercurrent with the humid and hot airflow at the humid and hot airflow inlet and being entrained into the defogging unit, that is, the humid and hot airflow to be treated and the condensed water are respectively introduced into and discharged from the defogging packing unit through different parts of the defogging packing unit (the hypotenuse and the bottom short side of the inverted trapezoidal structure), thereby significantly improving the defogging effect.

In addition, compared with the prior art, the demisting packing unit and demisting cooling tower of the preferred embodiment of the present invention can have the following beneficial effects:

1. The defogging packing unit of the present invention can be provided with a baffle water collecting structure on both sides of the inverted trapezoidal structure at the bottom of the heat exchange plate. On the one hand, the overall structural strength of the defogging packing can be greatly increased; on the other hand, when the humid hot air passes through the convex structure of the baffle water collecting, the tiny water droplets carried by it hit the outside of the baffle water collecting structure, and the tiny droplets are captured by the baffle under the action of inertial force and recovered by gravity, especially the separate recovery from condensed water can be achieved, thereby improving the utilization value of low-salt condensed water. The defogging packing unit of the present invention has a better water collection and defogging effect. The water collecting and defogging tower containing the defogging packing unit of the present invention can eliminate the water collector layer of the traditional cooling tower. At the same time, the defogging packing unit of the present invention is provided with a vertical guide groove inside, which can capture the droplets entrained by the humid hot air by relying on the different inertia of the inverted gas-liquid density difference, and guide it to the lower part of the water collecting groove through the inclined guide groove, thereby reducing the entrainment of droplets of the humid hot air flow and enhancing the water collection and defogging ability.

The unique two-stage entrained droplet series capture structure can remove more than 95% of the entrained liquid, and the removal rate of entrained droplets larger than 20μm is close to 100%.

2. The defogging packing unit of the present invention can be opened at the short side of the bottom of the inverted trapezoidal structure at the bottom of the heat exchange plate. The short side is a horizontal structure and is set to an open or semi-open structure to separate the air inlet from the liquid discharge port, reduce the entrainment caused by gas-liquid countercurrent, and enhance the separation effect of salt-containing water and low-salt water and the recovery rate of low-salt water. The open or semi-open structure is in contact with the partitioned water collecting tank, which can well support the weight of the entire water-collecting defogging packing without deformation; the short side of the bottom of the inverted trapezoid at the bottom of the heat exchange plate is an open structure, forming a liquid collection outlet and a liquid seal. The baffle water collection structure, vertical guide groove and inclined guide groove arranged inside the water-collecting defogging packing unit can respectively recover the salt-containing spray droplets brought by the humid hot gas and the salt-free condensate precipitated in the humid hot gas by partitioning, and guide them to the spray droplet collection area and condensate collection area in the partitioned water collecting tank respectively.

The unique separation of air inlet and drain outlet and the zoned water collection mechanism make the salt content of spray entrained water and condensate recovered by the zoned water collector differ by about a hundred times. The salt content of desalted water is 1-15ppm, which basically meets the requirements of low-grade desalted water, and realizes the function of producing high-value desalted water at the same time, which greatly improves the economic value of the demisting device, eliminates the company's desalted water production equipment or reduces the scale of desalted water production equipment, and improves the overall economic benefits of the company.

3. The water collecting and mist dispelling cooling tower of the present invention can eliminate the setting of the traditional water collector because the mist dispelling filler has a significant water collecting function. The damper has sufficient rotation space and the height of the whole tower can be reduced by 1-2 meters compared with conventional technology, which significantly reduces the equipment cost.

4. The water-absorbing and mist-eliminating filler of the present invention has a polygonal heat exchange plate. The upper part of the two vertical sides of the heat exchange plate is a three-section top fold line with a concave middle section. The three-section top fold line structure with a concave middle section can better correspond to the inverted trapezoidal structure of the lower part of the heat exchange plate. When the water-absorbing filler is used to produce the heat exchange plate by rolling the flat sheet, the bottom structure of the heat exchange plate can have a certain shape fit with the top structure of the heat exchange plate, which greatly reduces the generation of waste. The waste rate can be as high as close to zero, thereby reducing costs.

5. In the water-collecting and mist-eliminating cooling tower of the present invention, the hot and humid air and the cold air enter the interior of the mist-eliminating packing unit through the air inlets on both sides of the inverted trapezoidal structure at the bottom of the mist-eliminating packing. When the air initially enters the mist-eliminating packing, due to the spacing between the hot and cold channels, the actual inlet area on the side of the inverted trapezoidal structure area at the bottom of the mist-eliminating packing unit is reduced by half, and the initial wind speed entering the packing is equivalent to 1.4 times the wind speed of the tower cross section. When entering the upper structure of the inverted trapezoidal structure of the mist-eliminating packing through the hot and cold channels, the gas flow rate is reduced to the same as the wind speed of the tower cross section, and the pressure drop of the mist-eliminating packing unit and the mist-eliminating packing layer is only about 50% of that of the traditional technology.

6. In the water-collecting and mist-dispelling cooling tower of the present invention, air enters the mist-dispelling packing and finally leaves through the top outlet of the heat exchanger. Since the hot and cold channels of the top folded-line outlet are arranged at intervals, the air can be quickly and evenly mixed after leaving the mist-dispelling packing through the hot and cold channels of the top outlet. No additional mixing space is required on the top of the water-collecting and mist-dispelling tower, and the height of the tower can be further reduced.

7. The water collecting and mist dissipating cooling tower of the present invention has a mist dissipating packing layer formed by a plurality of mist dissipating packing units with their sides abutting against each other. The installation cost of the mist dissipating packing layer is low, and the cost of the whole tower is low.

8. The defogging channel is provided with a rotating baffle of the damper. In summer, the damper rotating baffle is in a vertical position, the shutter is closed, and the hot and humid air is discharged from the cooling tower through the cold and hot channels of the defogging packing at the same time; in winter, the damper rotating baffle is in a horizontal position, the shutter is opened, and the dry cold air enters the cold channel of the defogging packing through the cold air channel, and the hot and humid air enters the hot channel of the defogging packing through the hot and humid air channel. The defogging cooling tower of the present invention includes two modes: water collection and defogging operation and thermal operation, which can be respectively applied to the needs of different seasons and have the characteristics of flexible operation.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a demisting filler unit according to a first embodiment of the present invention;

FIG2 is a schematic diagram of the assembly structure of a mist elimination filling unit according to a first embodiment of the present invention;

FIG3 is a schematic diagram of the edge sealing structure on both sides of the inverted trapezoidal structure of the heat exchange plate;

FIG4 is a schematic diagram of the structure of the bottom short side of the inverted trapezoidal structure of the heat exchange plate;

FIG5a is a schematic diagram of the installation structure of the water collection tank;

Fig. 5b is a schematic diagram of the joint of the water collection tank;

FIG6 is a schematic diagram of the structure of a vertical flow guide protrusion;

FIG. 7 is a schematic diagram of the structure of the oblique flow-guiding protrusion;

FIG8 is a schematic diagram of a demisting cooling tower in a demisting operation mode according to a second embodiment of the present invention;

FIG9 is a schematic diagram of a mist-eliminating cooling tower in a non-mist-eliminating operation mode;

FIG10 is a schematic diagram of a mist dispelling cooling tower according to a third embodiment of the present invention;

FIG11 is a perspective view of a mist-eliminating packing unit used in the mist-eliminating cooling tower in FIG10;

FIG12 is a schematic diagram of a water collection tank at the bottom of the mist dissipation packing unit used in the mist dissipation cooling tower in FIG10;

FIG13 is a schematic diagram of a mist elimination filling unit according to a fourth embodiment of the present invention;

FIG14 is a schematic diagram of a mist elimination filling unit according to a fifth embodiment of the present invention;

FIG15 is a partial enlarged view of the fog-eliminating packing unit in FIG14;

FIG16 is a partial enlarged view of the fog-eliminating packing unit in FIG14;

FIG17 is a schematic diagram of a demisting filler unit according to a sixth embodiment of the present invention;

FIG18 is a partial enlarged view of the fog-eliminating packing unit in FIG17;

FIG. 19 is a partially enlarged view of the mist-eliminating filler unit in FIG. 17 .

Description of Reference Numerals
1001-heat exchange plate; 1002-vertical guide protrusion; 1003-baffle water collection structure; 1004-oblique guide protrusion; 1005-water collection groove; 1006-top fold line; 1007-top fold line angle; 1008-oblique sealing surface; 1009-oblique sealing surface; 1010-sealing surface angle; 1011-bottom short side; 1012-oblique side; 1013-humid hot air; 1014-dry cold air; 1015-spray droplet collection outlet; 1016-condensed water collection outlet 1017-condensed water collection area; 1018-spray droplet collection area; 1019-cold channel outlet; 1020-hot channel outlet; 1021-vertical edge sealing surface; 1022-wet hot air flow inlet; 1023-liquid collection outlet; 1024-liquid sealing port; 1025-dry cold air flow inlet; 1026-inverted trapezoidal structure; 1027-misting packing unit; 1028-side; 1029-condensed water droplets; 1030-gap; 1031-windward surface of the baffle water collection structure;
2001-cooling tower air inlet; 2002-water spraying filler layer; 2003-spraying unit; 2004-damper; 2005-dry cold air channel; 2006-humid hot air channel; 2007-wind tube; 2008-cooling tower air outlet; 2009-louver; 2010-partition; 2011-tower body; 2012-fan; 2013-misting filler layer;
3001- mist elimination packing unit; 3002- top outlet; 3003- water collection tank;
4001- mist elimination packing unit; 4002- top outlet;
5001-wet hot air inlet; 5002-liquid collection outlet; 5003-liquid sealing port; 5004-support reinforcement area; 5005-dry cold air inlet; 5006-misting filler unit; 5007-inverted trapezoidal structure; 5008-upper folding plate area; 5009-columnar support;
6001-heat exchange plate; 6002-liquid collection outlet; 6003-liquid sealing port; 6004-vertical guide protrusion; 6005-upper spoiler strip; 6006-misting filler unit; 6007-inverted trapezoidal structure; 6008-oblique guide protrusion; 6009-inverted trapezoidal structure spoiler strip; 6010-baffle water collection structure.

DETAILED DESCRIPTION

The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

In the present invention, unless otherwise specified, directional words such as "up, down, left, right" generally refer to up, down, left, right as shown in the reference drawings; "inside and outside" refer to inside and outside relative to the outline of each component itself.

Figures 1 to 19 provide a variety of different embodiments of the demisting packing unit, which includes a plurality of heat exchange plates arranged in a stack, and the sides of adjacent heat exchange plates are sealed and connected to each other to form dry cold air flow channels and moist hot air flow channels that are alternately distributed along the stacking direction and can exchange heat through the walls between the heat exchange plates. The lower part of the heat exchange plate is formed into an inverted trapezoidal structure, and adjacent heat exchange plates are alternately sealed and connected at the oblique sides of the inverted trapezoidal structure to alternately form a dry cold air flow inlet connected to the dry cold air flow channel and a moist hot air flow inlet connected to the moist hot air flow channel on the two sides opposite to each other, and a liquid collection outlet connected to the moist hot air flow channel is formed at the short side of the bottom, and a water collection and diversion structure that can guide at least part of the moisture carried in the airflow entering from the moist hot air flow inlet and/or generated by the condensation of the airflow to the liquid collection outlet is formed on the side of the heat exchange plate facing the moist hot air flow channel.

At least part of the moisture carried in the airflow introduced through the humid and hot air flow inlet and/or generated by the condensation of the airflow can be guided by the water collecting and guiding structure to the liquid collection outlet formed at the bottom short side of the inverted trapezoidal structure of the corresponding heat exchange plate, thereby avoiding the condensed water recovered in the demisting packing unit from forming a countercurrent with the humid and hot airflow at the humid and hot air flow inlet and being entrained into the demisting unit, that is, the humid and hot airflow to be treated and the condensed water are respectively introduced into and discharged from the demisting packing unit through different parts of the demisting packing unit (the hypotenuse and the bottom short side of the inverted trapezoidal structure), thereby significantly improving the demisting effect.

Wherein, as described later in different embodiments, the water collecting and guiding structure may include a guiding protrusion and/or a baffled water collecting structure. Wherein, the guiding protrusion can guide the salt-free condensed water precipitated from the humid hot air flow to the liquid collection outlet, and the baffled water collecting structure can guide the salt-containing spray droplets brought by the humid hot gas to the liquid collection outlet. Wherein, the corresponding guiding protrusions formed on adjacent heat exchanger plates are opposite to or abut against each other in the humid hot air flow channel to separate the humid hot air flow channel into a plurality of flow areas, and for this purpose, the protrusion height of the guiding protrusions on each heat exchanger plate can be half the thickness of the humid hot air flow channel. Alternatively, the protrusion height of the guiding protrusion can be equal to the thickness of the humid hot air flow channel, so that it can abut against another adjacent heat exchanger plate.

It should be understood that, although described as an "inverted trapezoidal structure", the shape of the lower part of the heat exchanger is not limited to a strict trapezoidal shape. For example, its "bottom short side" can extend in the horizontal direction, or have an appropriate inclination angle relative to the horizontal direction, or extend along a wavy line based on the horizontal direction, etc. Similarly, the hypotenuse of the inverted trapezoidal structure can also be other shapes other than straight sides. Therefore, the term "inverted trapezoidal structure" used in the present invention is only for the convenience of clear and concise expression. As long as the lower part of the heat exchanger is sealed and connected to form a liquid collection outlet and a dry cold air flow inlet and a moist hot air flow channel on both sides thereof, and the side of the heat exchanger facing the moist hot air flow channel is formed with a water collecting and guiding structure that can guide at least part of the water carried in the air flow entering the moist hot air flow inlet and/or generated by the condensation of the air flow to the liquid collection outlet, it belongs to the conception scope of the present invention. Among them, the term "inverted" mainly refers to that the length of the bottom short side of the trapezoidal structure at the lower part of the heat exchanger is less than the length of the position where the trapezoidal structure is connected to the main part of the upper part of the heat exchanger. For example, typically, as shown in FIG. 1 , the inverted trapezoidal structure of the heat exchange plate may be an isosceles trapezoid including a top long side and a bottom short side 1011 , and the lengths of the oblique sides 1012 on both sides thereof are equal to each other.

The demisting packing unit may also include a water collecting tank disposed on the lower side of the heat exchange plate and opposite to the short side of the bottom of the inverted trapezoidal structure, the water collecting tank having a condensed water collection area for collecting condensed water and a spray droplet collection area for collecting spray water. Thus, the salt-free condensed water precipitated from the humid hot air flow and the salt-containing spray droplets brought by the humid hot gas are guided to different areas of the water collecting tank, realizing zoned recovery, meeting the requirements of low-grade demineralized water, realizing the demisting device having the function of producing high-value demineralized water at the same time, greatly improving the economic value of the demisting device, eliminating the enterprise's demineralized water production device or reducing the scale of the demineralized water production device, and improving the overall economic benefits of the enterprise.

In order to save production costs, each heat exchange plate can have the same structure. Therefore, when assembled to form a defogging packing unit, a water collecting and guiding structure is also formed on the side of the heat exchange plate facing the dry cold air flow channel, and the water collecting and guiding structure is the same as the water collecting and guiding structure in the wet hot air flow channel. Accordingly, a liquid seal port connected to the dry cold air flow channel is also formed at a position corresponding to the short side of the bottom of the inverted trapezoidal structure, and at least part of the moisture carried in the air flow entering the dry cold air flow channel from the dry cold air flow inlet and/or generated by the condensation of the air flow can be guided to the liquid seal port. However, since the dry cold air flow channel basically does not produce condensed water in the usual water collecting and defogging mode, a deflecting water collecting structure may or may not be provided.

The following describes various different embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that these embodiments are only exemplary, and the technical features in different embodiments can be used interchangeably without violating the technical principles thereof to form other more embodiments falling within the scope of the present invention.

Embodiment 1:

This embodiment provides a preferred structure of the water collecting and mist dissipating unit.

As shown in Figures 1 to 7, the demisting filler unit 1027 of the present invention is composed of a plurality of vertically arranged heat exchange plates 1001 stacked (or layered); both sides of the heat exchange plate 1001 have vertically extending side edges 1028, and the lower part connected to the side edges 1028 is an inverted trapezoidal structure 1026; the opposite side edges 1028 of the heat exchange plate 1001 are provided with vertical sealing surfaces 1021 to form relatively spaced moist hot air flow channels and dry cold air flow channels; the opposite sides of the inverted trapezoidal structures 1026 of adjacent heat exchange plates 1001 are alternately surrounded by oblique sealing surfaces 1008 to form spaced moist hot air flow inlets 1022 and dry cold air flow inlets 1025.

The moist hot air inlet 1022 and the dry cold air inlet 1025 (i.e., the openings formed by the oblique sealing surfaces 1008 alternately surrounding the opposite sides of the inverted trapezoidal structures 1026 at the lower part of the adjacent heat exchange plates 1001) are arranged at intervals, and the other side of the inverted trapezoidal structure 1026 opposite to the moist hot air inlet 1022 and the dry cold air inlet 1025 is closed by the oblique sealing surface 1008. The relatively spaced moist hot air flow channels and the dry cold air flow channels are not connected to each other.

The bottom short sides 1011 of the inverted trapezoidal structures 1026 of adjacent heat exchange plates 1001 form a downward opening structure, and the adjacent opening structures are respectively connected to the moist hot air flow channel and the dry cold air flow channel to form spaced liquid collection outlets 1023 and liquid sealing ports 1024.

As shown in FIG. 1 and FIG. 2 , the lower part of the heat exchanger 1001 is an inverted trapezoidal structure 1026, which has a bottom short side 1011 and oblique sides 1012 on both sides, and the top of the heat exchanger 1001 is a top fold line 1006, and the top fold lines 1006 of adjacent heat exchangers 1001 form a cold channel outlet 1019 and a hot channel outlet 1020, and a baffle water collecting structure 1003 is respectively arranged beside the oblique side 1012 of the inverted trapezoidal structure in the wet hot air flow channel and beside the oblique side 1012 of the inverted trapezoidal structure in the dry cold air flow channel, and a guide protrusion is arranged inside the heat exchanger 1001. The upper part of the inverted trapezoidal structure 1026 of the heat exchanger 1001 is provided with a vertical guide protrusion 1002 extending in the vertical direction, and the protrusion or depression direction of adjacent vertical guide protrusions 1002 on the heat exchanger 1001 is opposite. The inverted trapezoidal portion 1026 of the heat exchange plate is provided with inclined and discontinuous oblique guide protrusions 1004, which extend discontinuously and obliquely upward in the inverted trapezoidal structure 1026 along the direction of the airflow from the humid hot air flow inlet 1022 or the dry cold air flow inlet 1025 to the humid hot air flow channel or the dry cold air flow channel, and the oblique guide grooves with different inclination directions have opposite protrusions or depressions.

As shown in Figures 2 and 4, the humid hot air 1013 enters the humid hot air flow channel from the humid hot air flow inlet 1022, and the dry cold air 1014 enters the dry cold air flow channel from the dry cold air flow inlet 1025; the air flowing out of the humid hot air flow channel leaves the demisting filler unit through the hot channel outlet 1020; the air flowing out of the dry cold air flow channel flows out of the demisting filler unit through the cold channel outlet 1019; the air flowing out of the hot channel outlet 1020 and the air flowing out of the cold channel outlet 1019 are mixed at the top of the demisting filler unit and are further discharged out of the cooling tower.

As shown in Fig. 3, the oblique sealing surface 1008 is perpendicular to the base surface of the heat exchange plate 1001, forming a sealing surface angle 1010, and the side of the oblique sealing surface 1008 that is not connected to the heat exchange plate 1001 extends outward to form an oblique sealing surface 1009, and the oblique sealing surface 1009 is perpendicular to the oblique sealing surface 1008. Each heat exchange plate 1001 can be bent in the same direction at a position close to the moist hot air flow inlet 1022 to form a baffled water collecting structure 1003, and its bending height can be close to or exceed the thickness of the moist hot air flow channel, preferably 0.7 to 2 times the thickness of the moist hot air flow channel, and more preferably 0.9 to 1.1 times, and the baffled water collecting structure 1003 extends in a direction parallel to the oblique side 1012 of the inverted trapezoidal structure 1026 on the side of the moist hot air flow inlet 1022. Thus, the baffled water collecting structure 1003 can change the flow direction of the airflow entering from the hot and humid airflow inlet 1022 in the hot and humid airflow channel, and the spray droplets carried in the airflow hit the windward surface 1031 of the baffled water collecting structure and are captured. Then, under the action of gravity, these spray droplets are guided to the liquid collection outlet along the extension direction of the baffled water collecting structure 1003.

As shown in Figures 5a and 5b, the water collecting groove 1005 is tightly abutted against the bottom short side 1011 of the inverted trapezoidal structure at the bottom of the heat exchange plate 1001; the two sides of the water collecting groove 1005 are spray liquid droplet collection areas 1018, and the middle is a condensed water collection area 1017, the spray liquid droplet collection outlet 1015 is connected to the spray liquid droplet collection area 1018, and the condensed water collection outlet 1016 is connected to the condensed water collection area 1017.

As shown in Figures 6 and 7, the hot and humid air 1013 entering the hot and humid air flow channel of the defogging filler unit 1027 and the dry and cold air 1014 entering the dry and cold air flow channel from the dry and cold air inlet 1025 are subjected to inter-wall heat exchange through the heat exchange plate 1001, and the hot and humid air is condensed. Due to the heat exchange with the dry and cold air, the temperature of the hot and humid air 1013 drops, and the saturated hot and humid air 1013 precipitates condensed water as the temperature drops. The condensed water adheres to the heat exchange plate and is carried by the hot and humid air. The hot and humid air 1013 carrying condensed water is guided by the oblique guide protrusion 1004, enters the upper part of the inverted trapezoidal structure 1026, and turns in the process. The condensed water carried in the hot and humid air 1013 has different densities and large differences in inertia. Due to inertia, it hits the vertical guide protrusion 1002, and the condensed water droplets 1029 carried by the hot and humid air are captured by the vertical guide protrusion 1002.

The condensed water droplets attached to and captured on the heat exchange plates inside the hot and humid air flow channel flow along the vertical guide protrusions 1002 and the oblique guide protrusions 1004 under the action of gravity, and flow downward through the gaps 1030 of the oblique guide protrusions, and further enter the condensed water collection area 1017 of the water collecting tank 1005.

A portion of the humid hot air 1013 carrying spray droplets coming from the watering filler directly enters the defogging filler unit 1027 through the humid hot air flow inlet 1022. The remaining humid hot air 1013 flows toward the inclined edge sealing surface 1008, and is deflected by the inclined edge sealing surface 1008, and then enters the hot channel air inlet 1022 and enters the defogging filler unit 1027. The spray droplets entrained in the humid hot air 1013 deflected by the inclined edge sealing surface 1008 are blocked and captured by the inclined edge sealing surface 1008, and flow along the inclined edge sealing surface 1009 to the spray droplet collection area 1018 of the water collecting tank 1005.

The hot and humid air 1013 carrying the spray droplets entering the mist elimination packing unit 1027 first passes through the baffle water collecting structure 1003, and the hot and humid air 1013 carrying the spray droplets is baffled by the baffle water collecting structure 1003. During the baffle process of the hot and humid air, the density of the spray droplets carried by the hot and humid air is large. The air pressure is much higher than that of the hot and humid air and its inertia is relatively large. The entrained spray droplets hit the windward surface 1031 of the baffle water collecting structure. The spray droplets entrained by the hot and humid air are captured and removed by the baffle water collecting structure and flow into the spray droplet collection area 1018 of the water collecting tank 1005 along the windward surface 1031 of the baffle water collecting structure under the action of gravity.

The liquid seal port 1024 is sealed by the liquid in the water collecting tank 1005 to prevent the cold and hot gases from mixing with each other.

In this embodiment, as shown in FIG1 , the top edge of the heat exchanger 1001 is formed as a plurality of downwardly concave edges, namely, a top fold line 1006, which includes three segments of the bottom short edge 1011 and the oblique edge 1012 that roughly correspond to the inverted trapezoidal structure 1026, and forms a top fold line angle 1007. Thus, the upper part of the two vertical edges of the heat exchanger is a three-segment top fold line with a concave middle portion, and the three-segment top fold line structure with a concave middle portion can correspond well to the inverted trapezoidal structure at the bottom of the heat exchanger, so that when the heat exchanger is produced by rolling flat sheets, the bottom structure of the heat exchanger can have a certain shape fit with the top structure of the heat exchanger, which greatly reduces the generation of waste materials, and the waste rate can be close to zero at the highest, thereby reducing costs.

Embodiment 2:

By using the demisting filler unit 1027 in the first embodiment, this embodiment provides a structure of a demisting cooling tower.

As shown in Figures 8 and 9, the demisting cooling tower of the present invention includes a tower body 2011, a cooling tower air inlet 2001 is provided at the lower part of the tower body 2011, and a cooling tower air outlet 2008 is provided at the upper end, and the cooling tower air outlet 2008 is configured to use a wind tube 2007 to guide the outgoing air, and a fan 2012 is provided in the wind tube 2007; a water sprinkling filler layer 2002 is provided at the upper part of the cooling tower air inlet 2001, and a spray unit 2003 is provided above the water sprinkling filler layer 2002, which is used to spray hot water; a damper 2004 is provided above the spray unit 2003, and a water collecting trough 1005 is provided at the upper part of the damper 2004, and a demisting filler layer 2013 composed of a plurality of demisting filler units 1027 is provided above the water collecting trough 1005, and the side surfaces of the demisting filler units described in the plurality of embodiment one are mutually abutted to form the demisting filler layer 2013.

As shown in FIG8 , the demisting channel includes a partition 2010 and a damper 2004. The partition and the damper separate the demisting channel system into a dry cold air channel 2005 and a moist hot air channel 2006. The dry cold air channel 2005 is connected to a louver 2009 on the side of the tower body 2011. The louver 2009 is arranged on the side wall of the cooling tower and is also used as a cold air inlet when the cooling tower is in demisting operation.

The hot and humid air passage 2006 and the dry and cold air passage 2005 are not connected to each other. The upper end of the partition 2010 is connected to the bottom of the water collecting tank 1005. The upper surface of the water collecting tank 1005 is in contact with the liquid collecting outlet 1023 and the liquid sealing port 1024 at the lower part of the inverted trapezoidal structure of the defogging packing unit 1027. The lower ends of adjacent partitions 2010 are spaced apart with dampers 2004, and the lower ends of the partitions 2010 are connected to the side of the dampers 2004. The dry and cold air passage 2005 is formed between the partition, the damper and the defogging packing layer 2013 (the damper 2004 is in the closed state, i.e., the horizontal position), and the hot and humid air in the cooling tower cannot enter. At this time, the dry and cold air passage 2005 can only be introduced into the cooling tower through the shutters 2009 arranged on the side wall of the cooling tower connected thereto.

The damper 2004 can rotate along the rotation axis in the middle of itself and can be in a horizontal position (fogging condition) or a vertical position (non-fogging condition)

The process of the mist elimination operation mode of the water-saving mist elimination cooling tower of the present invention is as follows:

As shown in Figure 8, the circulating hot water is evenly sprayed on the water-spraying filler 2002 through the spray unit 2003. The external dry and cold air 1014, driven by the fan 2012, enters the cooling tower from the air inlet 2002 at the lower part of the tower body, flows upward through the water-spraying filler layer 2002, and countercurrently contacts the circulating hot water sprayed from the top of the water-spraying filler layer 2002. Mass and heat are transferred on the surface of the water-spraying filler layer 2002, and the circulating hot water is cooled, leaves the water-spraying filler layer 2002 and falls into the water collection pool below the cooling tower air inlet 2001. The external dry and cold air passing through the water-spraying filler layer 2002 is heated and becomes saturated humid hot air 1013, leaves the water-spraying filler, enters the humid hot air channel 2006, and enters the humid hot air flow channel of the demisting filler unit 1027 through the humid hot air channel 2006. The damper 2004 is closed, the shutter 2009 is opened, and the dry cold air passage 2005 composed of the partition 2010 and the damper 2004, under the suction action of the fan 212, the dry cold air from the outside enters the dry cold air passage 2005 through the shutter 2009, and then enters the dry cold air flow passage of the mist-eliminating packing unit 1027. In the mist-eliminating packing unit, the captured spray droplets and the condensed water collected by cooling are discharged to the spray droplet collection area 1018 and the condensed water collection area 1017 of the water collection tank 1005 through the liquid collection outlet 1023 at the bottom of the mist-eliminating packing unit 1027, respectively, wherein the baffle water collection structure 1003 plays the role of isolating and diverting the spray droplet collection and the condensed water collection. The condensed water collected by the condensed water collection area 1017 has very little salt content and can be directly used as low-grade demineralized water, greatly reducing the production cost of demineralized water.

Figure 9 describes the working process of the water-saving and mist-eliminating cooling tower in summer operation (i.e., thermal operation mode): the circulating hot water is evenly sprayed on the water-spraying filler layer 2002 through the spray unit 2003, and the dry and cold air from the outside enters from the lower part of the tower body driven by the fan 212, flows upward through the water-spraying filler layer 2002, and countercurrently contacts with the circulating hot water sprayed from the top of the water-spraying filler layer 2002. Mass and heat are transferred on the surface of the water-spraying filler layer 2002, and the circulating hot water is cooled, leaves the water-spraying filler layer 2002 and falls into the water collection pool at the bottom of the cooling tower inlet 2001. The dry and cold air from the outside that passes through the water-spraying filler layer 2002 is heated, becomes saturated hot and humid air, leaves the water-spraying filler layer 2002, and enters the mist-eliminating channel. The damper 2004 rotates around its own rotation axis to a vertical state (open), and at the same time, the shutter 2009 connected to the dry cold air channel 2005 is in a closed state, then the hot and humid air from the water-spraying filler layer 2002 enters the defogging filler unit 1027 through the dry cold air channel 2005 and the hot and humid air channel 2006 of the defogging channel, and the dry cold air flow channel and the hot and humid air flow channel of the defogging filler unit 1027 are all used as channels for hot and humid air. The hot and humid air carries many small liquid water droplets, which are captured by the beveled edge sealing surface 1008, the baffle water collection structure 1003, and the vertical guide protrusion 1002 in the flow of the dry cold air flow channel and the hot and humid air flow channel in the defogging filler unit 1027, and are guided and gathered to form liquid collection. The collected liquid in the water flows out through the liquid collection outlet 1023 and the liquid sealing port 1024 of the mist elimination packing unit 1027, respectively, and enters the water collection tank 1005, and is further recovered.

Embodiment three:

This embodiment provides a deformation mode of a demisting filler unit and a demisting cooling tower.

As shown in Figures 10 and 11, the demisting cooling tower of this embodiment has basically the same composition and working principle as the demisting cooling tower described in Example 2. The difference lies in that the top outlet 3002 of the demisting filler unit 3001 used is in a horizontal state, that is, the top edge of each heat exchange plate is formed as a horizontal straight edge, so as to form cold channel outlets that are alternately distributed along the stacking direction and connected to the dry cold air flow channel and hot channel outlets that are connected to the moist hot air flow channel over the entire length area of the top edge.

In addition, as shown in FIG. 12 , the short sides of the bottom of the heat exchange plate in the demisting filler unit 3001 abut against the water collecting tank 3003 , and the water collecting tank 3003 is not partitioned, so that the spray water and condensed water collected therein are mixed.

Embodiment 4:

This embodiment provides a second variation of the demisting filler unit.

As shown in FIG13 , the top outlet 4002 of the demisting packing unit 4001 is honeycomb-shaped. Specifically, the top edge of the heat exchange plate used in the demisting packing unit 4001 extends along the wave line and adjacent heat exchange plates are connected to each other at the wave crest/wave trough position, so as to form a cold channel outlet that is alternately distributed along the stacking direction and connected to the dry cold air flow channel and a hot channel outlet that is connected to the wet hot air flow channel in the entire length area of the top edge, and the cold channel outlet and the hot channel outlet form a top outlet 4002 in a honeycomb shape.

Embodiment five:

This embodiment provides a third variation of the demisting filler unit.

As shown in Figures 14 to 16, the lower part of the heat exchange plate used in the demisting filler unit 5006 is an inverted trapezoidal structure 5007, and the upper part is formed as an upper folded plate area 5008. The upper folded plate areas 5008 of adjacent heat exchange plates are supported and separated from each other by columnar supports 5009, forming a dry cold air flow channel and a moist hot air flow channel.

As shown in Figure 15, humid hot air enters the defogging packing unit from the humid hot air flow inlet 5001, and the collected liquid generated or captured by the defogging packing unit flows out from the liquid collection outlet 5002 and enters the water collection tank. Cold air enters the defogging packing from the dry cold air flow inlet 5005, and the liquid seal port 5003 at the bottom of the defogging packing is sealed by the liquid in the water collection tank to prevent the hot and cold gases from mixing with each other. In this embodiment, the bottom short sides of the inverted trapezoidal structure 5007 of adjacent heat exchange plates are connected to each other at the part away from the corresponding humid hot air flow inlet 5001 or the dry cold air flow inlet 5005 to form a liquid collection outlet 5002 and a liquid seal port 5003 of a semi-open structure. The part of the heat exchange plate close to the bottom short side can be strengthened to form a support strengthening area 5004.

As shown in FIG16 , the upper fold area 5008 is a parallel fold structure, and the heat exchange plates are supported and separated from each other by columnar supports 5009. When the incoming hot and humid air passes through the upper fold area of the defogging filler unit, it is repeatedly deflected by the fold area, and the droplets entrained in the air flow are captured.

Embodiment six:

This embodiment provides a fourth variation of the demisting filler unit.

As shown in Figures 17 to 19, the demisting filler unit 6006 is composed of repeatedly stacked heat exchange plates 6001, the lower part of which is an inverted trapezoidal structure 6007. Adjacent heat exchange plates are supported and separated from each other at the top by vertical guide protrusions 6004 to form dry cold air flow channels and moist hot air flow channels.

The inverted trapezoidal structure 6007 has beveled edges on both sides, and a baffled water collecting structure 6010 is provided at a position close to one beveled edge in the moist hot air flow channel, and a vertical guide protrusion 6004 is provided on the upper part of the heat exchange plate 6001, and the protrusion or depression directions of adjacent vertical guide protrusions 6004 on the heat exchange plate 6001 are opposite. The heat exchange plate 6001 is provided with inclined and discontinuous oblique guide protrusions 6008 at the inverted trapezoidal structure 6007, and the inclination direction of the oblique guide protrusion 6008 is the same as the inclination direction of the beveled edges on both sides of the inverted trapezoidal structure 6007, and the oblique guide grooves with different inclination directions have opposite protrusion or depression directions.

The humid hot air enters the defogging packing unit 6006 from the humid hot air flow inlet, and the collected liquid generated or captured by the defogging packing unit 6006 flows out from the liquid collection outlet 6002 and enters the water collection tank. The cold air enters the defogging packing unit from the dry cold air flow inlet, and the liquid seal port 6003 at the bottom is sealed by the liquid in the water collection tank to prevent the cold and hot gases from mixing with each other.

In addition to the above-mentioned structure, the upper and lower parts of the heat exchange plate 6001 of the demisting filler unit 6006 are also provided with an upper spoiler strip 6005 and an inverted trapezoidal spoiler strip 6009 to enhance the heat exchange effect.

In the water-collecting and mist-eliminating tower of the present invention, the relatively cold air in the cold season atmosphere enters the dry cold air channel through the louvers, and further enters the water-collecting and mist-eliminating packing unit through the dry cold air flow inlet; the humid hot air carrying the spray droplets coming up from the water-spraying packing layer enters the hot air channel, and reaches the humid hot air flow inlet through the hot air channel, and enters the water-collecting and mist-eliminating packing. The humid hot air carrying the spray droplets entering the water-collecting and mist-eliminating packing first passes through the baffle water-collecting structure, and the humid hot air carrying the spray droplets is baffled by the baffle water-collecting structure. During the baffle process of the humid hot air, the humid hot air carrying the spray droplets is baffled by the baffle water-collecting structure. The density of spray droplets is much higher than that of humid hot air, and its inertia is relatively large. The entrained spray droplets hit the windward surface of the baffle water collecting structure. The spray droplets entrained by the humid hot air are captured and removed by the baffle water collecting structure, and flow along the windward surface of the baffle water collecting structure under the action of gravity into the spray droplet collection area of the partitioned water collecting tank.

The hot and humid air without the entrained spray droplets passes over the baffle water collection structure and further enters the hot channel of the water collection and defogging filler. It exchanges heat with the cold air entering the cold channel from the air inlet of the cold channel through the heat exchange plate, and the hot and humid air is condensed. Due to the heat exchange with the cold air, the temperature of the hot and humid air drops, and the saturated hot and humid air precipitates condensed water as the temperature drops. The condensed water adheres to the heat exchange plate and is entrained by the hot and humid air. The hot and humid air entrained with condensed water is guided by the inclined guide groove and enters the upper part of the inverted trapezoid of the water collection and defogging filler, and turns in the process. The condensed water entrained in the hot and humid air has different densities and large differences in inertia. Due to inertia, it hits the vertical guide groove, and the condensed water droplets added by the hot and humid air are captured by the vertical guide groove. The condensate droplets attached to and captured on the heat exchanger plates inside the hot channel flow along the vertical guide grooves and the inclined guide grooves under the action of gravity, flow to the lower part at the discontinuity of the inclined guide grooves, and further enter the condensate collection area of the partitioned water collection tank.

After the heat exchange between the hot and cold air flows in the above-mentioned water collecting and mist dissipating module, the dry cold air from the outside is heated and the temperature rises, and the humid hot air is cooled down. Finally, the cooled humid hot air and the heated dry cold air leave the water collecting and mist dissipating filler and mix to become unsaturated air, which is discharged out of the tower through the fan to achieve the purpose of water collecting and mist dissipation.

According to the different operating seasons and operating loads of the water mist collecting and dispelling tower, the water mist collecting and dispelling cooling tower of the present invention can be divided into a water mist collecting and dispelling operation mode and a thermal operation mode. In the water mist collecting and dispelling mode, a part of the external cold air is directly introduced into the water mist collecting and dispelling filler in the tower to realize the water mist collecting and dispelling of the cooling tower. In the thermal operation mode, all the external cold air passes through the water spraying filler, and at this time, the cooling tower has the maximum circulating water cooling capacity.

In the water collection and demisting operation mode, the circulating hot water is evenly sprayed on the water filling through the circulating hot water spray head. The dry and cold air from the outside enters from the air inlet of the water filling at the bottom of the tower body under the drive of the fan, flows upward through the water filling, and countercurrently contacts the circulating hot water sprayed from the top of the water filling. The circulating hot water is cooled by mass and heat transfer on the surface of the water filling, and enters the water collection tank below the water filling. The dry and cold air from the outside that passes through the water filling is heated and becomes saturated hot and humid air, leaving the water filling, entering the hot and humid air channel, and entering the hot channel of the demisting filling through the hot and humid air channel. The cold air channel composed of the partition and the damper, under the suction action of the fan, the dry and cold air from the outside enters the cold air channel through the louver, and then enters the cold channel of the demisting filling. Inside the defogging filler, the airflow first passes through the baffle water collection structure. The spray water droplets entrained in the airflow are collected under the action of inertial force and flow to the spray droplet collection area of the partitioned water collection tank by gravity, and then return to the tower; the airflow further enters the heat exchange plate, and the cold channel and hot channel in the defogging filler are arranged at intervals. The heat transfer between the heat exchange plates occurs, the humid hot air is cooled, and the dry cold air is heated. The droplets condensed by the humid hot air are captured by the vertical guide groove and the heat exchange plate and diverted through the inclined guide groove into the condensate collection area of the partitioned water collection tank. The condensate collected in the condensate collection area contains very little salt and can be used as feed for the desalting device, or directly used as desalting water in places with lower requirements. This part of the condensate can also be returned to the tower. The heated dry cold air and the condensed humid hot air are mixed together after leaving the defogging filler, becoming unsaturated gas, and discharged from the cooling tower through the fan.

In the thermal operation mode, the cooling tower does not need to be defogged in summer. At the same time, the cooling tower has a high operating load in summer, and the cooling tower needs to have the maximum cooling capacity. The thermal operation mode is as follows: the circulating hot water is evenly sprayed on the water filling through the circulating hot water spray head. The dry and cold air from the outside enters from the lower part of the tower body under the drive of the fan, flows upward through the water filling, and contacts the circulating hot water sprayed from the top of the water filling in countercurrent. Mass and heat are transferred on the surface of the water filling. The circulating hot water is cooled and enters the water collection tank below the water filling. The dry and cold air from the outside that passes through the water filling is heated and becomes saturated humid hot air, leaving the water filling and entering the defog channel. The damper of the defog channel rotates around the rotation axis to a vertical state, and the shutters connected to the cold air channel are in a closed state. Then, the humid hot air from the water filling enters the defog filler through the cold air channel and the humid hot air channel of the defog channel. The cold channel and the hot channel of the defog filler all have humid hot air. The humid hot air carries with it many small liquid water droplets. When flowing in the cold channel and hot channel of the mist-eliminating filler, the humid hot air is collected by the baffle water collection structure. The humid hot air leaving the mist-eliminating filler is discharged from the cooling tower through the fan.

The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various specific technical features in any suitable manner. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims (12)

A defogging packing unit comprises a plurality of heat exchange fins (1001, 6001) arranged in a stack, wherein the side edges (1028) of adjacent heat exchange fins (1001, 6001) are sealed and connected to each other to form dry cold air flow channels and wet hot air flow channels which are alternately distributed along the stacking direction and can exchange heat through the walls of the heat exchange fins (1001, 6001). The unit is characterized in that the lower portion of the heat exchange fins (1001, 6001) is formed into an inverted trapezoidal structure (1026, 5007, 6007), and adjacent heat exchange fins (1001, 6001) are alternately sealed and connected at the oblique edges (1012) on both sides of the inverted trapezoidal structure (1026, 5007, 6007). A dry cold air flow inlet (1025, 5005) connected to the dry cold air flow channel and a humid hot air flow inlet (1022, 5001) connected to the humid hot air flow channel are alternately formed on two sides opposite to each other, and a liquid collection outlet (1023, 5002, 6002) connected to the humid hot air flow channel is formed at the short side (1011) of the bottom, and a water collecting and guiding structure is formed on the side of the heat exchange plate (1001, 6001) facing the humid hot air flow channel, which can guide at least part of the moisture carried in the air flow passing through the humid hot air flow inlet (1022, 5001) and/or generated by condensation of the air flow to the liquid collection outlet (1023, 5002, 6002). The demisting filler unit according to claim 1 is characterized in that the water collecting and guiding structure includes a guiding protrusion protruding from the heat exchange plate (1001, 6001) into the moist hot air flow channel, and the guiding protrusion includes an oblique guiding protrusion (1004, 6008) extending discontinuously upward in the inverted trapezoidal structure (1026, 5007, 6007) along the direction of the air flow from the moist hot air flow inlet (1022, 5001) into the moist hot air flow channel, and the condensed water generated by the condensation of the air flow entering the moist hot air flow inlet (1022, 5001) can be guided by the oblique guiding protrusion (1004, 6008) and fall to the liquid collection outlet (1023, 5002, 6002) through the gap (1030) between adjacent oblique guiding protrusions (1004, 6008). The demisting filler unit according to claim 2 is characterized in that the guide protrusion also includes a vertical guide protrusion (1002, 6004) extending vertically upward from the top of the oblique guide protrusion (1004, 6008), and the guide protrusion abuts against another adjacent heat exchange plate (1001, 6001) in the hot and humid air flow channel. The demisting filler unit according to claim 2 is characterized in that the water collecting and diverting structure includes a parallel fold structure formed on the main body of the heat exchange plate (1001, 6001) located above the inverted trapezoidal structure (1026, 5007, 6007), and adjacent heat exchange plates (1001, 6001) are formed in the main body to have upper fold areas (5008) extending parallel to each other, so that the airflow entering from the hot and humid air flow inlet (1022, 5001) is repeatedly folded when flowing through the upper fold area (5008). The demisting packing unit according to any one of claims 1 to 4 is characterized in that the water collecting and guiding structure includes a deflecting water collecting structure (1003, 6010) formed at a position of the heat exchange plate (1001, 6001) close to the moist hot air flow inlet (1022, 5001) and extending in a direction of the hypotenuse (1012) on one side of the moist hot air flow inlet (1022, 5001) parallel to the inverted trapezoidal structure (1026, 5007, 6007), the deflecting water collecting structure (1003, 6010) being formed so that the airflow introduced from the moist hot air flow inlet (1022, 5001) changes its flow direction in the moist hot air flow channel and guides the spray water carried in the airflow to the liquid collecting outlet (1023, 5002, 6002). The demisting filler unit according to any one of claims 1 to 5 is characterized in that the demisting filler unit also includes a water collecting groove (1005, 3003) arranged on the lower side of the heat exchange plate (1001, 6001) and opposite to the bottom short side (1011) of the inverted trapezoidal structure (1026, 5007, 6007). The demisting filling unit according to claim 6 is characterized in that the water collecting trough (1005, 3003) has a condensed water collection area (1017) for collecting condensed water generated by condensation of the airflow introduced through the moist and hot air flow inlet (1022, 5001) and a spray droplet collection area (1018) for collecting spray water carried in the airflow introduced through the moist and hot air flow inlet (1022, 5001), and the spray droplet collection area (1018) is separated from the condensed water collection area (1017). The demisting packing unit according to any one of claims 1 to 7 is characterized in that adjacent heat exchange plates (1001, 6001) form liquid sealing openings (1024, 5003, 6003) at the bottom short sides (1011) which are connected to the dry cold air flow channel and are alternately distributed with the liquid collection outlets (1023, 5002, 6002) along the stacking direction of the heat exchange plates (1001, 6001), and the side of the heat exchange plate (1001, 6001) facing the dry cold air flow channel is formed with the water collecting and guiding structure which is the same as that in the wet hot air flow channel, and the water collecting and guiding structure is configured to guide at least part of the moisture carried in the air flow introduced by the dry cold air flow inlet (1025, 5005) and/or generated by condensation of the air flow Lead to the liquid seal port (1024,5003,6003). The demisting filler unit according to any one of claims 1 to 8 is characterized in that the top edge of the heat exchange plate (1001, 6001) is formed as a horizontal straight edge or a plurality of downwardly concave edges, and adjacent heat exchange plates (1001, 6001) form cold channel outlets (1019) alternately distributed along the stacking direction and connected to the dry cold air flow channel and hot channel outlets (1020) connected to the wet hot air flow channel over the entire length area of the top edge. The demisting filler unit according to any one of claims 1 to 9 is characterized in that the top edge of the heat exchange plate (1001, 6001) extends along a wave line and adjacent heat exchange plates (1001, 6001) are connected to each other at the wave crest/wave trough positions, so as to form cold channel outlets (1019) alternately distributed along the stacking direction and connected to the dry cold air flow channel and hot channel outlets (1020) connected to the wet hot air flow channel over the entire length area of the top edge, and the cold channel outlets (1019) and the hot channel outlets (1020) form a honeycomb-shaped top outlet (3002, 4002). The demisting filler unit according to any one of claims 1 to 10 is characterized in that a columnar support (5009) is formed on the heat exchange plate (1001, 6001) and extends within the dry cold air flow channel and/or the wet hot air flow channel and abuts against the adjacent heat exchange plate (1001, 6001). A demisting cooling tower, characterized in that the demisting cooling tower comprises a tower body (2011) and a demisting packing layer (2013), a spray unit (2003) and a water sprinkling packing layer (2002) arranged from top to bottom in the tower body (2011), the demisting packing layer (2013) comprising a plurality of groups of demisting packing units (1027, 3001, 4001, 5006, 6006) according to any one of claims 1 to 11 connected to each other at the side, the tower body (2011) is formed with a demisting packing layer (2013) located at The cooling tower air inlet (2001) at the lower side of the water spraying filler layer (2002) and a plurality of dry cold air channels (2005) respectively connected to the dry cold air flow inlets (1025, 5005) are located between the mist eliminating filler layer (2013) and the spraying unit (2003); and there are humid hot air channels (2006) between adjacent dry cold air channels (2005) for allowing the spray liquid evaporated from the water spraying filler layer (2002) to flow to the humid hot air flow inlets (1022, 5001).