CN108801035A - Novel fishbone adds the plate-type heat exchanger slab of semi-cylindrical protrusion - Google Patents

Abstract

The invention provides a new plate heat exchanger plate with fishbone shape and semi-cylindrical protrusions, including a plate main body, on which corner holes, diversion areas, diversion areas, and heat exchange areas are arranged; along the heat exchange Corrugations are arranged on both sides of the axis of the flow direction of the heat exchange medium in the zone, an angle is set between the corrugations on the same side and the axis of the heat exchange zone, plane troughs are set between adjacent corrugations on the same side, and corrugations on different sides are arranged staggered left and right along the axis of the heat exchange zone , a number of semi-cylindrical protrusions are set on the trough.

Description

New herringbone-shaped and semi-cylindrical raised plate heat exchanger plates

technical field

The invention relates to a heat exchanger plate technology, in particular to a novel fishbone-shaped plate heat exchanger plate with semi-cylindrical protrusions.

Background technique

Compared with shell and tube heat exchangers, plate heat exchangers have high heat transfer coefficient, large logarithmic average temperature difference, small end temperature difference, small footprint, light weight, low price, convenient production, easy cleaning, and small heat loss. Not easy to scale and other advantages. Plate heat exchanger The plate is the most important part of the plate heat exchanger, and the design of the plate directly affects the heat exchange effect of the entire plate heat exchanger.

The plate heat exchanger is composed of several identical plates in a certain order, usually a herringbone plate as shown in Figure 1, which includes positioning holes 1, corner holes 2, diversion area 3, diversion Zone 4, heat exchange zone 5, front small corrugation 6, rear small corrugation 7 and large corrugation 8. When the fluid flows into the plate through the corner hole 2, passes through the diversion area 3 and the diversion area 4, and flows into the heat exchange area 5, where heat exchange is performed on the corrugated plate, that is, the heat exchange area 5. The fluid after heat exchange flows to the corner hole on the other side, and then flows into the next set of plates. At the same time, another fluid flows in the opposite direction on the other side of the plate and performs heat exchange, and the fluid after heat exchange flows to the next set of plates. Plate heat exchanger plates are the main components that affect the performance of plate heat exchangers. At present, there are many corrugated shapes of plates of plate heat exchangers: herringbone corrugated, straight corrugated, trapezoidal straight corrugated, zigzag corrugated, etc. The shapes of the corrugations in the heat exchange areas of these plates are different, but none of them take into account the problem of how to make the fluid on the plates evenly distributed, which has a great impact on the heat exchange effect.

Contents of the invention

The purpose of the present invention is to provide a new plate heat exchanger with herringbone shape and semi-cylindrical protrusions, which has more uniform fluid distribution and better heat exchange effect.

The technical solution for realizing the purpose of the present invention is: a new plate heat exchanger plate with a fishbone shape and a semi-cylindrical protrusion, including a plate main body, on which corner holes, diversion areas, diversion areas, heat exchange Corrugations are set on both sides of the axis along the flow direction of the heat exchange medium in the heat exchange area, an included angle is set between the corrugations on the same side and the axis of the heat exchange area, plane troughs are set between adjacent corrugations on the same side, and corrugations on the opposite side are arranged along the heat exchange zone. The axis of the area is arranged staggered left and right, and several semi-cylindrical protrusions are set on the trough.

With the above-mentioned heat exchanger plate, the widths of the corrugations and the troughs are equal, and the two ends of the bottom surface of the corrugation end on the same side coincide with the two edges of the corresponding troughs on the opposite side.

With the above-mentioned heat exchanger plate, the width of the corrugation is smaller than the width of the trough, and the two ends of the bottom surface of the end of the corrugation on the same side are located between the two edges of the corresponding trough on the opposite side.

The plate structure of the new fishbone plate heat exchanger of the present invention, the staggered corrugations can enhance the disturbance of the fluid in the flow channel; the staggered flow of fluid can reduce the dead zone of heat exchange flow, so that the flow distribution of the fluid in the heat exchange area more evenly. There is a semi-cylindrical protrusion at the trough, which can enhance the disturbance of the fluid near the protrusion, resulting in secondary enhanced heat transfer; at the same time, the obliquely arranged protrusions can also play the role of diversion, so that the fluid flow in the heat exchange area more evenly distributed. The presence of the protrusions also increases the heat exchange area and optimizes the overall performance of the plate heat exchanger.

The present invention will be further described below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a schematic structural view of a herringbone plate of a conventional plate heat exchanger.

Fig. 2 is a schematic diagram of the plate structure of the novel herringbone plate heat exchanger of the present invention.

Fig. 3 is a schematic diagram of the structure of the heat exchange zone of the present invention.

Detailed ways

Combined with Figure 2 and Figure 3, a new type of plate heat exchanger plate with fishbone shape and semi-cylindrical protrusions, including the main body of the plate, on which the positioning hole 1, the corner hole 2, the diversion area 3, and the diversion area are set. Zone 4, heat exchange zone 5. The positioning holes 1 are located at both ends of the main body of the sheet for positioning. There are four corner holes 2 respectively located on the four corners of the plate main body, and the heat exchange medium flows through the corner holes 2 . The flow guide area 3 guides the heat exchange medium to the flow distribution area 4 . The split area 4 splits the heat exchange medium to different areas of the heat exchange area 5 . Corrugations 11 are arranged on the heat exchange area 5 along the flow direction of the heat exchange medium.

When the heat exchange medium flows into the plate through the corner hole 2, passes through the diversion area 3 and the diversion area 4, and flows into the heat exchange area 5, where heat exchange is performed on the corrugated plate, that is, the heat exchange area 5. The fluid after heat exchange flows to the corner hole on the other side, and then flows into the next set of plates. At the same time, another fluid flows in the opposite direction on the other side of the plate and performs heat exchange, and the fluid after heat exchange flows to the next set of plates.

Corrugations 7 are arranged on both sides of the axis of the flow direction of the heat exchange medium in the heat exchange zone 5, an included angle is set between the corrugations 7 on the same side and the axis of the heat exchange zone 5, a plane trough 6 is set between adjacent corrugations 7 on the same side, and The corrugations 7 are alternately arranged left and right along the axis of the heat exchange area 5 , and a number of semi-cylindrical protrusions 8 are arranged on the wave troughs 6 .

The width of the corrugation 7 is equal to that of the trough 6, and the two ends of the bottom surface of the end of the corrugation 7 on the same side coincide with the two edges of the corresponding trough 6 on the opposite side; The corresponding trough 6 on the opposite side is between the two edges.

The included angle between the corrugation axis and the axis of the heat exchange zone 5 is 45°-60°. The included angle should not be too large or too small. If the included angle is too large, most of the fluid will directly impact the front oblique wave surface of the corrugation, while less fluid flows along the wave surface; if the included angle is too small, on the contrary, neither of these two cases can Disperses fluids well.

The fishbone-shaped corrugations of the present invention are arranged in a staggered manner, which can enhance the disturbance of the fluid in the flow channel, generate secondary flow in the flow direction, and generate a secondary vortex. The generation of the secondary vortex strengthens heat transfer; the staggered arrangement of corrugations enables the fluid to The staggered flow also has the effect of reducing flow resistance, making the flow distribution of the fluid in the heat exchange area more uniform, and optimizing the overall performance of the plate heat exchanger.

The semi-cylindrical projections have a diameter of 2-5mm and a height of 5-12mm. The angle between the cylindrical generatrix and the centerline of the plate corrugation is smaller than the angle between the corrugation axis and the centerline, and the distance between the projections is 3-7mm. The included angle should not be too large or too small. If the included angle is too large, most of the fluid will directly impact the front slope wave surface of the corrugation, while less fluid flows along the wave surface; if the included angle is too small, it will be the opposite. Neither of these two cases can handle the relationship between flow and resistance very well, and the heat transfer effect is slightly inferior. A certain interval is set between each protrusion, instead of being continuous. When the fluid flows through the bulge, a secondary flow is generated, which separates the flow and produces local disturbances, and rejoins at the downstream of the flow. In order to obtain a higher strengthening effect, another bulge is added. The continuous bulge not only weakens the disturbance, but also increases the resistance.

The plate structure of the new herringbone plate heat exchanger in the heat exchange area, the corrugation shape is one of horizontal and straight corrugations, herringbone corrugations, flat corrugations, trapezoidal straight corrugations or zigzag corrugations. When the heat exchanger is assembled, the identical plates can be rotated 180° and pressed together completely.

Claims (7)

1. A new plate heat exchanger plate with a fishbone shape and semi-cylindrical protrusions, including a plate main body, on which corner holes (2), diversion areas (3), diversion areas (4), The heat exchange zone (5), is characterized in that, Corrugations (7) are arranged on both sides of the axis along the flow direction of the heat exchange medium in the heat exchange area (5), An included angle is set between the corrugations (7) on the same side and the axis of the heat exchange zone (5), Planar troughs (6) are set between adjacent corrugations (7) on the same side, Corrugations (7) on different sides are arranged staggered left and right along the axis of the heat exchange zone (5), Several semicylindrical protrusions (8) are arranged on the trough (6). 2. The plate according to claim 1, characterized in that the corrugations (7) are equal in width to the troughs (6), and the two ends of the bottom surface of the corrugations (7) on the same side and the corresponding troughs (6) on the opposite side are two The edges overlap. 3. The heat exchanger plate according to claim 1, characterized in that the width of the corrugations (7) is smaller than the width of the troughs (6), and the two ends of the bottom surface of the corrugations (7) on the same side are located at the corresponding troughs (6) on the opposite side ) between the two edges. 4. The heat exchanger plate according to claim 2 or 3, characterized in that the included angle between the corrugation axis and the axis of the heat exchange zone (5) is 45°-60°. 5 . The heat exchanger plate according to claim 1 , wherein the diameter of the semi-cylindrical protrusion is 2-5 mm, and the height is 5-12 mm. 6. The heat exchanger plate according to claim 1, characterized in that the included angle between the busbar of the semi-cylindrical protrusion (8) and the axis of the heat exchange area (5) is smaller than the axis of the corrugation (7) and the axis of the heat exchange area (5) ) the included angle of the axis, and the distance between the protrusions is 3-7 mm. 7. The heat exchanger plate according to claim 1, characterized in that the corrugation (7) is in one of the shapes of horizontal and straight corrugations, herringbone corrugations, straight corrugations, trapezoidal straight corrugations or zigzag corrugations .