WO2016119365A1

WO2016119365A1 - Compound heat exchange evaporative condenser of board pipe

Info

Publication number: WO2016119365A1
Application number: PCT/CN2015/081392
Authority: WO
Inventors: 李志明; 谭栋; 张勇
Original assignee: 广州市华德工业有限公司
Priority date: 2015-01-28
Filing date: 2015-06-12
Publication date: 2016-08-04
Also published as: CN105987622B; CN105987622A; EP3252416A4; MY193547A; EP3252416B1; US20170276437A1; EP3252416A1

Abstract

A compound heat exchange evaporative condenser of a board pipe comprises a fan (4), a water pump (5), a water distributor (6), and a collecting basin (7), and further comprises a compound heat exchanger (8) of the board pipe. The compound heat exchanger of the board pipe is formed by connecting multiple compound heat exchange fins of the board pipe by using an inlet header and an outlet header. The compound heat exchange fin of the board pipe comprises a heat transfer plate (2) and a coil pipe (1) formed by processing a heat exchange pipe. The heat transfer plate is provided with a placing groove (21). The shape of the placing groove (21) matches the shape of the coil pipe (1). The coil pipe (1) is placed in the placing groove (21). A gap between the coil pipe (1) and the placing groove (21) is filled with a heat conduction bonding layer (3). The heat conduction bonding layer (3) makes the heat transfer plate (2) fully contact with the coil pipe (1), so that the coil pipe (1) can produce a rib effect by using the heat transfer plate, thereby enlarging an effective heat exchange area. The heat transfer plate can drain cooling water to form a continuous water flow surface, thereby enlarging an evaporation surface area of the cooling water. The effective heat exchange area and an evaporation area of the cooling water are enlarged, which improves heat exchange efficiency and also is beneficial to reducing a size of a condenser.

Description

Plate tube composite heat exchange type evaporative condenser

Technical field

The invention relates to the field of heat exchange equipment, in particular to a plate type and coil type composite heat exchange type evaporative condenser.

Background technique

At present, the evaporative condensers on the market usually use a curved coil to form a heat exchanger, and the outer surface of the heat exchanger is cooled by spray water, and the circulating spray water is used to evaporate and remove heat. However, the outer surface of the heat exchanger tube of the coil heat exchanger is generally a smooth surface, and the heat exchange efficiency is low. At the same time, the surface area of the cooling water evaporating heat transfer is small, and the spacing of the coils needs to be increased to increase the heat exchange time between the cooling water and the air, resulting in a bulky volume of the entire heat exchanger. On the other hand, since there is no medium to guide the flow of cooling water between the upper and lower tubes of the coil, when the cooling water descends from above, under the traction of the vertical wind direction, the cooling water is disorderly fluttering and easy to generate flying water, and the coil is clothed. The water is uneven, easy to store dry spots, reduce heat exchange capacity and there is a risk of scaling.

In the patent of the applicant's earlier application number CN202836298U, a heat exchange tube for a coupling coupling coil evaporative condenser is disclosed, and a filler sheet is installed between the coils to guide the spray water to form a water film, and the solution is solved. The problem of disorderly flying water of cooling water. Although the invention patent improves the heat exchange efficiency to some extent, since the heat exchange efficiency is improved only by increasing the utilization rate of the cooling water, the heat exchange efficiency is not greatly improved.

Summary of the invention

In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to increase the heat exchange efficiency to a greater extent by changing the heat exchange structure of the coil.

In order to solve the above technical problems, the technical solution adopted by the present invention is a plate-tube composite heat exchange type evaporative condenser, including a fan, a water pump, a water distributor, a sump; and a plate-tube composite heat exchanger; The composite heat exchanger is composed of a plurality of plate-tube composite heat exchange sheets connected through an inlet header and an outlet header; the plate-tube composite heat exchange sheet comprises a heat transfer plate and a coil processed by the heat exchange tube; The heat transfer plate is provided with a receiving groove, the shape of the receiving groove is matched with the shape of the coil; the coil is placed in the mounting groove, and the gap between the coil and the mounting groove is filled with a heat conductive adhesive layer. The heat transfer plate can guide the spray cooling water from the upper heat exchange tube to the lower heat exchange tube to improve the utilization of the cooling water; and at the same time, the heat conductive adhesive layer fills the gap between the full coil and the heat transfer plate to make the disk The tube is in full contact with the heat transfer plate, and the heat transfer plate becomes a rib of the coil, increasing the effective heat exchange area of the coil.

Preferably, the thermally conductive adhesive layer is a metal filled layer. Such a structure can be realized by soaking liquid metal and then cooling, so that the heat conductive adhesive layer can be sufficiently filled into the gap, and the heat conductivity of the metal is good, thereby further improving the rib formation of the heat transfer sheet.

More preferably, the gap between the coil and the seating groove is less than 10 mm. Such a structure has a small gap. When liquid metal immersion is performed, due to the viscosity of the liquid metal, the liquid metal may cause capillary action, and after penetrating into the inner surface of the heat transfer plate and the coil contact surface, a contact surface can be formed in the contact surface. The uniform thin packing not only completely fuses the heat transfer sheet and the coil into a whole, but also the filling layer is thin, thereby reducing the contact thermal resistance between the heat transfer sheet and the coil.

More preferably, the heat transfer sheet is also stamped with a plurality of limiting slots and/or positioning pads. Such a structure ensures that the gap between the coil and the heat transfer plate can be sufficiently small when the liquid metal is immersed.

Preferably, the metal-filled layer is one or more of zinc, tin, aluminum, and copper. These metals have low melting point and low price, and are used for liquid metal immersion, which is extremely cost-effective.

In a preferred embodiment, the thermally conductive adhesive layer is a thermally conductive adhesive. Direct use of thermal adhesives makes processing easier.

Preferably, the plate-tube composite heat exchange fin is disposed longitudinally, that is, the cooling wind blown by the fan flows along a substantially length direction of the coil. The cooling wind direction is consistent with the length of the coil, and there is no leeward surface, which reduces the dry point of the heat exchange coil surface and reduces the risk of scaling of the heat exchange coil.

Preferably, the heat exchange tube is bent with a plurality of straight pipe segments; the straight pipe segments adjacent to the heat exchange tubes are parallel to each other, and the pipe spacing of the straight pipe segments adjacent to the heat exchange tubes is the same, or the pipe spacing is received from the first place. The lower layer of the spray cooling water gradually becomes smaller as the lower layer of the spray cooling water. Such a structure improves the heat exchange temperature difference between the cooling water and the lower coil, and finally can achieve the effect of improving heat exchange efficiency and reducing the amount of heat exchange tubes used.

In a preferred embodiment, the heat exchange tube may be bent with a plurality of straight pipe sections; the length of the straight pipe section of the heat exchange pipe is gradually increased from an upper layer that first receives the cooling water spray to a lower layer that receives the spray cooling water.

Preferably, the heat transfer sheet is further provided with one or more of a water guiding pattern, a water guiding opening, a water proof preventing structure or a reinforcing rib.

The plate-tube composite heat exchange type evaporative condenser of the present invention has the following beneficial effects as compared with the prior art:

1) The thermal conductive adhesive layer makes the heat transfer plate and the coil fully contact, so that the coil can generate a ribbing effect through the heat exchange plate and increase the effective heat exchange area;

2) The heat exchange plate can simultaneously drain the cooling water to form a continuous water flow surface, and increase the evaporation surface area of the cooling water;

3) Increasing the effective heat exchange area and the evaporation water evaporation area not only improves the heat exchange efficiency, but also helps to reduce the condenser volume.

The above description is only an overview of the technical solutions of the present invention, and the above-described and other objects, features and advantages of the present invention can be more clearly understood. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the structure of a plate-tube composite heat exchange type evaporative condenser of the present invention.

2 is a schematic structural view of a plate-tube composite heat exchange sheet of a plate-tube composite heat exchange type evaporative condenser according to the present invention.

3 is a schematic view showing the structure of a heat transfer plate of a plate-tube composite heat exchange sheet of a plate-tube composite heat exchange type evaporative condenser according to the present invention.

Figure 4 is a cross-sectional view taken along line A-A of Figure 2;

detailed description

The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

As shown in FIG. 1 , the plate and tube composite exchange evaporative condenser of the present invention comprises a fan 4 , The water pump 5, the water distributor 6, the sump 7; further comprises a plate and tube composite heat exchanger 8; the plate tube composite heat exchanger 8 is located between the water distributor 6 and the sump 7, and the water distributor 6 and the sump 7 are The water pump 5 is connected; the fan 4 is located at one end of the plate-tube composite heat exchanger 8. The plate tube composite heat exchanger 8 is composed of a plurality of plate tube composite heat exchange sheets connected through an inlet header and an outlet header. As shown in FIG. 2 and FIG. 3, the plate-tube composite heat exchange sheet comprises a coil 1 processed by a heat exchange tube (the processing may be a bending of a long heat exchange tube into a coil, or a bending The heat exchange tubes of the segment are welded together with the heat exchange tubes of the straight section to form a coil), and the heat transfer sheet 2 is also included. In this embodiment, the coil 1 is formed by continuous S-shaped bending of the heat exchange tubes, wherein the straight sections of the heat exchange tubes are substantially parallel or non-parallel, and the coil 1 can also adopt other suitable for use in the evaporation condenser. shape. The heat exchange tube of the coil 1 may be a copper tube, a stainless steel tube or a galvanized steel tube, etc., and the cross-sectional shape of the internal flow passage may be a circular shape, an elliptical shape, a spiral shape, a corrugated shape or an olive shape. As can be understood by those skilled in the art, the inner and outer surfaces of the coil 1 can adopt a smooth surface, preferably an enhanced heat transfer surface provided with internal and external threads, and the outer surface of the coil 1 can also be provided with a hydrophilic or anti-corrosive coating. Floor. The coil 1 is provided with an inlet and an outlet of a flow passage for connection with an inlet header and an outlet header. In this embodiment, the heat exchange tube is bent with a plurality of straight pipe sections; the straight pipe sections adjacent to the heat exchange pipe are parallel to each other, and the pipe spacing of the straight pipe sections adjacent to the heat exchange pipe is the same, or the pipe spacing is located The lower layer that receives the spray cooling water first receives the lower layer of the spray cooling water gradually becomes smaller; or the length of the straight pipe section of the heat exchange tube may be sprayed and cooled from the upper layer that is first received by the cooling water spray to the rear. The lower layer of water is gradually increasing. The material of the heat transfer sheet 2 may be a carbon steel sheet, a stainless steel sheet, an aluminum sheet, a copper sheet or the like. The plate-tube composite heat exchange fins are disposed longitudinally, that is, the cooling wind blown by the fan 4 flows along the longitudinal direction of the coil pipe 1.

As shown in FIG. 3 and FIG. 4, the heat transfer plate 2 is provided with a receiving groove 21. In the embodiment, the receiving groove 21 is realized by punching the heat transfer plate 2, or may be produced. The heat transfer sheet 2 is directly formed; the shape of the seating groove 21 matches the shape of the coil 1. The coil 1 is placed in the seating groove 21, and a gap between the coil 1 and the seating groove 21 is filled with a thermally conductive adhesive layer 3. In this embodiment, the thermally conductive adhesive layer 3 is a metal-filled layer of zinc. The specific method may be that the heat transfer sheet 2 and the coil 1 are immersed in the high temperature liquid zinc, so that the liquid zinc flows into the gap between the coil 1 and the seating groove 21, and the gap is filled, and the liquid metal is adhered. When the liquid metal is cooled and solidified into a solid state, the heat conductive adhesive layer 3 is filled between the coil 1 and the seating groove 21 to fix the both. In addition to zinc, it is also possible to use tin or aluminum or other metal combinations thereof, which have the characteristics of low melting point and low price, and are cost-effective.

Further, in this embodiment, the gap between the coil 1 and the seating groove 21 is less than 10 mm. When the liquid metal is immersed, due to the viscosity of the liquid metal, the liquid metal may undergo capillary action, infiltration and transmission. After the hot plate 2 and the inside of the contact surface of the coil 1, the thermally conductive adhesive layer 3 formed in the gap of the contact can be made uniform and thin, and the heat transfer sheet 2 and the coil 1 are completely fused together as a whole. Moreover, since the thickness of the thermally conductive adhesive layer 3 is thin, the contact thermal resistance between the heat transfer sheet 2 and the coil 1 is effectively reduced. The smaller the gap between the coil 1 and the seating groove 21, the more obvious the capillary action of the liquid metal permeation, the more uniform the formed thermal conductive adhesive layer 3, the greater the relative cost and the processing difficulty; the gap width of about 10 mm For cost optimization, the gap width of about 5 mm is the best cost-effective choice, and the optimal choice for uniform effect within 3 mm. Further, in order to ensure the immersion of the high temperature liquid metal, the spacing between the coil 1 and the heat transfer sheet 2 can be sufficiently small, The heat transfer plate 2 is punched out with a plurality of limiting slots and/or positioning solder joints (not shown). Before the immersion, the socket 1 is pre-fixed by the limit slot mounting or the positioning of the solder joints. . It is also possible to pre-fix the two by means of a clamp, but the operation is complicated.

The heat of the coil 1 is conducted to the heat transfer sheet 2 through the thermally conductive adhesive layer 3, and the heat transfer sheet 2 becomes the rib of the coil 1, which greatly increases the heat exchange area and directly enhances the heat exchange effect of the coil 1; The hot plate 2 has the effect of guiding the cooling water, so that the cooling water forms a continuous water flow on the surface of the heat transfer plate 2, avoids the disordered flying water of the cooling water, and improves the utilization rate of the cooling water. In addition, since the heat transfer sheet 2 is integrated, the cooling water at the coupling with the coil 1 can be prevented from flowing alternately, and the water distribution rate can be ensured.

On the other hand, the thermal conductive adhesive layer 3 can be replaced by a thermal conductive adhesive; the thermal conductive adhesive is evenly applied to the mounting groove 21 of the heat transfer plate 2, and the coil 1 is directly placed into the mounting groove 21. It can be bonded (for some thermal adhesives that need to be combined, it is also necessary to apply a matching thermal adhesive on the coil 1), which is easy to install and simple in process. However, the existing thermal conductive adhesives, such as silicone thermal conductive adhesives, epoxy resin AB adhesives, and polyurethane thermal conductive adhesives, are not as strong as zinc, aluminum, etc., and are prone to unevenness during the laminating process, resulting in unevenness. When the coil 1 is adhered to the seating groove 21, an air layer insulation phenomenon may occur, which affects heat exchange efficiency.

It is also possible to provide openings, corrugations, bends, water guides, dovetail grooves, reinforcing ribs and the like on the heat transfer sheet 2 to achieve an effect of increasing the water distribution effect, preventing the flying water, and enhancing the solidity. Further, a plurality of elongated holes, round holes or other shaped through holes (not shown) may be formed at the mounting groove 21, and when the coil 1 is placed in the seating groove 21, a part of the coil 1 may be exposed. Outside the tank 21, it can be directly in contact with the condensed water. Increasing the direct contact area between the coil and the water, and at the same time, the disturbance of the water flow due to the unevenness of the opening can strengthen the heat exchange of the copper tube, but to a certain extent, the rib formation of the heat transfer sheet is weakened.

The above embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention belong to the present invention. The scope of the claim.

Claims

The tube-tube composite heat exchange type evaporative condenser comprises a fan, a water pump, a water distributor and a sump; and is characterized in that: a plate-tube composite heat exchanger is further included; the plate-tube composite heat exchanger is composed of a plurality of plate tubes The heat exchange sheet is composed of an inlet header and an outlet header; the plate tube composite heat exchange sheet comprises a heat transfer sheet and a coil processed by the heat exchange tube; the heat transfer sheet is provided with a mounting groove, The shape of the seating groove matches the shape of the coil; the coil is placed in the mounting groove, and the gap between the coil and the mounting groove is filled with a thermally conductive adhesive layer.
The plate tube composite heat exchange type evaporative condenser according to claim 1, wherein the thermally conductive adhesive layer is a metal filled layer.
The plate tube composite heat exchange type evaporative condenser according to claim 2, wherein a gap between the coil and the seating groove is less than 10 mm.
The plate tube composite heat exchange type evaporative condenser according to claim 3, wherein the heat transfer plate is further stamped with a plurality of limiting grooves and/or positioning pads.
The plate-tube composite heat exchange type evaporative condenser according to claim 2, wherein the metal-filled layer is one or more of zinc, tin, aluminum, and copper.
The plate tube composite heat exchange type evaporative condenser according to claim 1, wherein the heat conductive adhesive layer is a heat conductive adhesive.
The plate-tube composite heat exchange type evaporative condenser according to claim 1, wherein the plate-tube composite heat exchange fin is longitudinally disposed, that is, a cooling wind blown by the fan along an approximate length of the coil The direction flows.
The plate tube composite heat exchange type evaporative condenser according to claim 1, wherein the heat exchange tube is bent with a plurality of straight pipe segments; the straight pipe segments adjacent to the heat exchange tubes are parallel to each other, adjacent to each other The pipe spacing of the straight pipe section of the heat exchange tube is the same, or the pipe spacing is located The upper layer that receives the spray cooling water first becomes smaller as the lower layer that receives the spray cooling water.
The plate-tube composite heat exchange type evaporative condenser according to claim 1, wherein the heat exchange tube is bent with a plurality of straight pipe sections; and the length of the straight pipe section of the heat exchange pipe is received from the first cooling water The lower layer of the sprayed cooling water is gradually increased from the upper layer to the rear.
The plate-tube composite heat exchange type evaporative condenser according to claim 1, wherein the heat transfer plate is further provided with one of a water guiding pattern, a water guiding opening, an anti-flying structure or a reinforcing rib. Kind or more.