CN201316679Y - Thermophoresis-type cyclone separator for superfine particles - Google Patents

Abstract

The utility model discloses a thermophoresis type cyclone separator for fine particles, which belongs to the field of environmental protection dust removal equipment. The inner wall of the interlayer is surrounded by a thermophoretic cyclone separation chamber, and the lower end of the inner wall of the interlayer is connected to the dust discharge cone sleeve and the dust hopper; the outer wall of the interlayer is connected to a water-cooled or air-cooled cooling device to generate a lower wall temperature; heating The device is connected through the inlet valve and the inner wall of the interlayer as an auxiliary heating device for generating a higher air flow temperature; the short pipe of the net gas outlet is fixed on the upper end wall of the inner wall of the interlayer. The utility model removes inhalable particles on the basis of the comprehensive effect of thermophoresis principle and centrifugal rotation effect, so that fine particles of various particle sizes can achieve higher total deposition efficiency. The fine particle thermophoresis cyclone separator can be connected in series in multiple stages, and when the air velocity is 5-25m/s, the total removal efficiency can reach 95%. Moreover, the construction cost and operation cost are low, the implementation is convenient, and the control is simple.

Description

Thermophoretic Cyclone Separator for Fine Particles

technical field

The utility model belongs to the field of environmental protection dust removal equipment. Specifically, it is a thermophoretic cyclone separator that uses the thermophoretic effect and centrifugal rotation effect under the action of temperature difference to deposit fine particles on the cold wall surface and realize the removal of fine particles in a wide range of particle sizes.

Background technique

The widely used common cyclone separator has extremely low removal efficiency for inhalable particulate matter (PM ₁₀ ) contained in the airflow. Under the action of the temperature difference between the higher airflow temperature and the colder wall surface, the fine particles in the airflow will move to the direction of lower temperature and deposit on the cold wall surface, which is called thermophoretic effect. Thermophoresis is a hot research topic in the world. According to the current foreign experimental and theoretical research results, the thermophoretic deposition efficiency caused by thermophoretic effect in turbulent flow is only 10% to 20%. The low efficiency of thermophoretic deposition is due to the fact that thermophoretic force is a short-range force and only works near the boundary layer. Moreover, studies have shown that when the length of the pipeline is more than 2m, the efficiency of thermophoretic deposition stops increasing. Therefore, there are few reports on dust collectors made of thermophoretic effect. A more typical study is: In 2002, South Korea's Byung Uk Lee and Sang Soo Kim in the literature "New type of impactor with a cooled impact plate for capturing PM _2.5 and other aerosol s. Journal of Aerosol Science. (34) 957-967.2003))" In , an experimental study was carried out on a new type of captive impactor equipped with a cold plate. At the same time, they used the inertial collision and thermophoretic deposition of the particles on the cold copper plate, and coated the copper plate with butter to bond the particles, so that the total deposition efficiency reached more than 50%, but this method is very complicated and difficult. applied to engineering practice. Therefore, to solve the problem of removing inhalable particulate matter, a new dust collector must be designed.

Contents of the invention

The purpose of this utility model is to solve the problem of extremely low removal efficiency of ordinary cyclone separators for inhalable particulate matter (PM ₁₀ ) contained in the airflow in the prior art, and propose to use thermophoresis principle and centrifugal rotation effect to realize the removal of fine particulate matter (PM 10 ). A fine particle thermophoretic cyclone separator for particulate matter, characterized in that the inner ring wall of the ring interlayer 6 of the fine particle thermophoretic cyclone separator forms a thermophoretic cyclone separation chamber 7, and the inner wall of the ring interlayer 6 The lower end of the ring wall is connected to the taper sleeve 8, and the thin taper mouth of the taper sleeve 8 extends into the dust collection hopper 9; the clean gas outlet pipe 3 is fixed on the upper end of the cyclone separator chamber 7; the intake valve 2 passes through the intake pipe and the separation chamber 7 Connected, the heater 1 is connected to the intake end of the intake valve 2, the coolant pump 11 is connected to the inlet valve 10 through a pipeline, and the inlet valve 10 communicates with the lower part of the interlayer 6, and the coolant discharge pipe is connected to the lower part of the interlayer 6. The upper part of the outer ring wall is connected, and the discharge valve 4 and the cooler 5 are connected in series.

Two short pipes with a first branch valve 12 and a second branch valve 13 are installed on the upper end surface of the cyclone separator.

Compared with the prior art, the utility model has the following outstanding advantages and effects: the principle of thermophoresis and the effect of centrifugal rotation are used to remove inhalable particles. On the basis of the centrifugal rotation effect and the thermophoretic effect, the combination of the two effects makes fine particles of various particle sizes achieve a higher total deposition efficiency. Using the multi-stage series connection of the thermophoretic cyclone separator for fine particles, when the air velocity is 5-25m/s, the total removal efficiency can be as high as over 90%. Moreover, the construction cost and operation cost are low, the implementation is convenient, and the control is simple; the equipment runs stably for a long time, and the performance is reliable. And it can be effectively used under various environmental conditions, and has obvious effects on the control of fine particulate matter environmental pollution. It is easy to carry out market promotion and application.

Description of drawings

Figure 1 is a schematic diagram of the structure of a thermophoretic cyclone separator for fine particles.

Fig. 2 is a top view of a thermophoretic cyclone separator for fine particles.

Detailed ways

The utility model provides a thermophoretic cyclone separator for fine particles. Below in conjunction with accompanying drawing, concrete structure, work process and best implementation mode of the present utility model will be further described.

Figure 1 is a schematic diagram of the structure of a thermophoretic cyclone separator for fine particles. Figure 2 is a top view of the cyclone separator. The utility model is a cyclone-type combined dust removal system with a ring interlayer and a coolant (cooling water or cold air). In the figure, the inner ring wall of the ring interlayer 6 is a heat exchange wall, which encloses a thermophoretic cyclone separation chamber 7, and the lower end of the inner ring wall of the ring interlayer 6 is connected to the cone sleeve 8, and the thin cone mouth of the cone sleeve 8 extends into the dust collection chamber. Inside the ash hopper 9; the clean gas outlet pipe 3 is fixed at the upper end of the cyclone separation chamber 7, the intake valve 2 is connected through the intake pipe and the inner ring wall of the interlayer 6, and the heater 1 is connected to the intake end of the intake valve 2 , as an auxiliary heating device that produces a higher airflow temperature; the coolant pump 11 communicates with the lower part of the interlayer 6 through the inlet valve 10, the pipeline, to generate a lower wall temperature; the coolant discharge pipe is connected to the upper part of the outer ring wall of the interlayer 6 out, and discharge valve 4 and cooler 5 in series.

The above-mentioned heat exchange wall encloses a thermophoretic cyclone separation chamber 7 (working section). Generally, the diameter of the cylinder is between 40mm and 200mm; the total height of the cylinder and the cone is 120mm to 1500mm, and the cylinder can be slightly shorter than the height of the cone; the diameter of the ash discharge port is 10mm to 140mm; the diameter of the net gas outlet pipe is 16mm to 140mm ; Entrance height 24mm ~ 130mm; entrance width 8mm ~ 60mm. The system can be installed in any external natural space and indoor space of the size required by the system. It can produce water-cooled and air-cooled micro-particle thermophoretic cyclone separators of various sizes. As shown in Figure 1, after passing through the auxiliary heater 1, the mixture of non-high-temperature gas particles enters the separation chamber 7 (working section) of the thermophoretic cyclone separator from the tangential direction of the working section of the separator. The mixture is centrifugally rotated in the separation chamber, and the relatively large particles will be separated close to the inner wall under the effect of centrifugal rotation; Gas) under the action of temperature difference on the wall surface, it is deposited on the tube wall surface according to the law of thermophoresis.

Considering that the dust particles discharged from power plants contain various types of particles with a wide range of particle sizes, and in consideration of improving the total deposition efficiency of fine particles, multi-stage series connection can be adopted. Through multi-level series connection, non-fully developed flow effects are continuously generated in several working sections of the swimming cyclone separator, so that the total deposition efficiency is continuously improved. The auxiliary heater of the present utility model mainly improves the incoming flow temperature. For the dust-laden airflow that already has a relatively high temperature, such as boiler flue gas, kiln flue gas, etc., this link can be omitted. The auxiliary heater can be replaced by an electric heater on the general market.

The two ends of the thermophoretic cyclone separator main ring sleeve interlayer are made of steel plates with holes, which are welded with the lower cylinder of the separator, so that the two cylinders are concentric and sealed to form a ring-shaped end surface, and the outer body of the separator interlayer is welded and passed through the water. hole. Cooling water can be taken from various normal temperature water sources and can be used repeatedly. The number of multi-level series connection should be determined according to the temperature difference and Reynolds number, generally about 10 is appropriate. The connection of the pipeline system should prevent water and air leakage.

Two short pipes with a first branch valve 12 and a second branch valve 13 are installed on the upper end surface of the cyclone separator. (Arrangement of 4 or more branches can also be considered). After closing the two main valves in and out, and opening the first branch valve 12 and the second branch valve 13, it is used to pass in compressed air to regularly purge the deposited fine particles. , and connect a cloth bag or other container at the dust outlet at the end of the airflow to collect fine particles. If the system has hot water supply or uses the cooling water that is heated during work, the hot water can be passed through the cooling water hole, and at the same time, the colder compressed air can be used to pass through the interlayer channel. Efficient blown into bag collection. Of course, the system can also be easily cleaned with various solvents such as water.

Claims (2)

1. a kind of fine particulate matter thermophoretic cyclone separator, it is characterized in that, the inner ring wall of the ring interlayer (6) of described fine particulate matter thermophoretic cyclone separator is surrounded into thermophoretic cyclone separation cavity (7), ring The lower end of the inner ring wall of the interlayer (6) is connected to the taper sleeve (8), and the thin taper mouth of the taper sleeve (8) extends into the dust collecting bucket (9); the net gas outlet is fixed at the upper end of the cyclone separator chamber (7) pipe (3); the intake valve (2) is connected through the intake pipe and the separation chamber (7), the heater (1) is connected to the intake end of the intake valve (2), and the coolant pump (11) passes through the pipeline and The inlet valve (10) is connected, the inlet valve (10) communicates with the lower part of the interlayer (6), the coolant discharge pipe is connected from the upper part of the outer ring wall of the interlayer (6), and the outlet valve (4) and cooler (5). 2. according to the described fine particulate matter thermophoresis type cyclone separator of claim 1, it is characterized in that, described cyclone separator upper end face is installed two respectively have the first branch valve (12), the second branch valve (13) ) short tube.

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