WO2014012284A1

WO2014012284A1 - Filler coupling coil pipe evaporative type condenser

Info

Publication number: WO2014012284A1
Application number: PCT/CN2012/080006
Authority: WO
Inventors: 李志明
Original assignee: 广州市华德工业有限公司
Priority date: 2012-07-20
Filing date: 2012-08-13
Publication date: 2014-01-23
Also published as: CN103575133A; CN103575133B

Abstract

A filler coupling coil pipe evaporative type condenser comprises a coil pipe heat exchanger (1), a draught fan (2), a water pump (3) and a water distributor (4). The coil heat exchanger (1) is formed by a plurality of heat exchange pipe pieces which are connected through an inlet collecting pipe (9) and an outlet collecting pipe (10). Each heat exchange pipe piece comprises a coil pipe (7) and a filler (8). At least one filler layer (8) used for guiding spraying cooling water to flow from an upper layer heat exchange pipe to a lower layer heat exchange pipe is arranged in the coil pipe (7). The filler coupling coil pipe evaporative type condenser can be lower the temperature of cooling water used for cooling the coil, improve the water distribution coverage rate of the cooling water used for cooling the coil, and improve the heat exchange rate, and has the advantages of being large in heat transfer area, and easy to wash.

Description

Packing coupling coil evaporative condenser

The present invention relates to the field of heat exchange equipment, and more particularly to an evaporative condenser using a coil as a heat exchanger.

^ At present, the coils for evaporative condensers on the market are transverse coils, which are cooled by spraying water on the outer surface of the coils, and the circulating spray water is used to evaporate the air to remove heat. 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 disordered floating of the cooling water is easy to generate flying water, and the water on the coil is uneven. Easy to store dry spots, reduce heat transfer capacity and risk of scaling. The cooling wind direction is perpendicular to the coil (that is, the cooling wind passes through the plane space formed by each heat exchange tube and is perpendicular to the straight pipe section of the heat exchange tube), and the coil has a windward side and a leeward side, and the leeward side is lacking. Air convection heat transfer reduces coil heat transfer efficiency. The water distribution and ventilation conditions of the elbow part of the coil are very poor, and the heat exchange area of this part is not rationally utilized. In order to achieve the amount of evaporation and ensure the amount of heat exchange, the length of the coil to be used needs to be increased. As the amount of metal material is increased, the cost is greatly increased. At the same time, due to the misalignment between the tubes and tubes of the conventional transverse coil, there is no The operating space for mechanical cleaning also has the disadvantage of being difficult to clean.

The purpose of the present invention is to overcome the shortcomings of the prior art and provide a packing coupling coil evaporating condenser, which can reduce the cooling water temperature of the cooling coil, improve the water coverage of the cooling coil cooling water, and improve the heat exchange. Efficiency and ease of cleaning.

The object of the invention is achieved by the following technical solution:

A packing coupling coil evaporative condenser comprises a coil heat exchanger, a fan, a water pump, a water distributor, a collecting basin and a frame; the coil heat exchanger comprises a plurality of heat exchange fins through an inlet header and An outlet header connection composition, characterized in that: the heat exchange tube piece comprises a coil and a filler,

The coil is provided with at least one piece for guiding the spray cooling water to flow from the upper heat exchange tube to the lower layer. Preferably, the coil is longitudinally disposed, that is, the cooling air blown by the fan flows along a substantially length direction of the straight pipe section of the coil.

Further, the heat exchange tubes of the coil are bent in an S shape, and the filler is disposed between the adjacent heat exchange tubes to connect the heat exchange tubes into a continuous water flow surface.

Further, the straight pipe sections adjacent to the heat exchange tubes are parallel to each other, and the pipe spacing of the straight pipe sections adjacent to the heat exchange pipes is the same, or the pipe spacing is from the upper layer receiving the spray cooling water to the shower cooling. The lower layer of water gradually becomes smaller.

Further, the straight pipe section of the heat exchange tube has a downward slope along the liquid flow in the pipe. Further, the length of the straight pipe section of the heat exchange pipe is gradually increased from the upper layer which first receives the cooling water spray to the lower layer which receives the shower cooling water.

Further, the heat exchange tube of the coil is bent in an S shape, and the filler is disposed in a plane space formed by the heat exchange tube, and is fixedly coupled with the heat exchange tube, continuously covering a plurality of At least a portion of the surface of the heat exchange tube.

Further, one or more pieces of the filler are attached to the heat exchange tube in a snap-fit manner.

Further, two or more of the fillers are relatively attached to the heat exchange tubes.

Further, the top of the heat exchanger and/or the bottom of the heat exchanger may further be provided with one or more pieces of packing, and z or one or more pieces of packing may be added between the heat exchange tubes of the heat exchanger. .

Further, one end of the heat exchanger is provided with a uniform wind structure for hurrices, and the other end of the packing is provided with an anti-flying water structure. The working principle of the invention: The high temperature fluid enters the coil heat exchanger through the mouthpiece header, at which time the water pump transports the low temperature water in the collecting tank to the water distributor at the top of the serpentine coil and sprays it onto the serpentine coil The outer surface forms a very thin water film, and the longitudinal serpentine coil combined with the filler allows the cooling water to flow through the surface of the upper heat exchange tube and then flows to the surface of the lower heat exchange tube under the guidance of the filler to guide the watering. At the same time, the fan introduces the wind with lower temperature and relative humidity into the space where the evaporative condenser is located, so that it exchanges heat with the heat exchanger and the cooling water flowing through the heat exchanger and the packing, and some water is sucked in the water film. After the heat is evaporated, the rest falls into the collecting basin, and the water supply pump is circulated, and the high-temperature fluid is cooled to a low-temperature fluid and then flows out from the outlet header. 1. Adopt longitudinal coil tube, the cooling wind direction is consistent with the length of the coil, there is no leeward surface, reduce the dry point of the heat exchange coil surface, and reduce the risk of scaling of the heat exchange coil;

2. The elbows at both ends of the longitudinal coil are placed in the airflow and cooling water sprinkling space to improve the effective utilization area of the coil;

3. It is easy to clean with this evaporative condenser, it is convenient to maintain and the cost of use is low;

4. The evaporative condenser adopts a filler-coupled longitudinal coil to reduce the phenomenon that the cooling water drifts or floats along the bottom of the heat exchange tube under the blowing of the cooling air, and at the same time increases the surface area of the cooling water evaporating heat transfer, and After the coil is heated, the water flows through the packing to achieve partial cooling, and the heat exchange temperature difference between the cooling water and the lower coil is improved, and finally the heat exchange efficiency and the heat exchange tube usage can be improved.

, - Figure! It is a schematic structural view of the first embodiment of the evaporative condenser of the present invention;

2 is a partial cross-sectional view of the E-A of the evaporative condenser of the present invention; FIG. 3 is a schematic view showing the structure of the heat transfer fin of the first embodiment of the evaporative condenser of the present invention; Is a cross-sectional view of the heat exchange fin of the first embodiment of the evaporative condenser of the present invention; the cross-sectional direction corresponds to the A-A direction of FIG. 3;

Figure 5 is a cross-sectional view showing another heat exchange fin of the first embodiment of the evaporative condenser of the present invention; the cross-sectional direction corresponds to the A-A direction of Figure 3;

Figure 6 is a schematic structural view of a second embodiment of the evaporative condenser of the present invention;

Figure 7 is a schematic structural view of a heat exchange fin in the second embodiment of the evaporative condenser of the present invention; Figure 8 is a cross-sectional view of the heat exchange fin shown in Figure 7;

Figure 9 is a schematic view showing another structure of the coil of the evaporative condenser of the present invention;

Figure 10 is a schematic view showing another structure of the coil of the evaporative condenser of the present invention;

Figure 11 is a schematic cross-sectional view showing the third embodiment of the evaporative condenser of the present invention;

Figure 12a is a schematic view showing the structure of the fourth embodiment of the evaporative condenser of the present invention;

Figure 12b is a side view showing the structure of the equalizing device in the evaporative condenser of the present invention;

Figure 12e is a schematic view showing the structure of the anti-flying device in the evaporative condenser of the present invention;

Figure 13 is a schematic view showing the structure of the present invention in which the fan is placed at the front of the heat exchanger;

Figure 14 is a schematic view showing the structure of the fan vertically placed in the present invention; Figure 15 is a schematic view showing the structure of the present invention in which a fan is vertically placed and a two-group heat exchanger is used;

Fig. 16 is a schematic view showing another structure of the present invention in which a fan is vertically placed and a two-group heat exchanger is employed. detailed description

The present invention will be further described in detail below with reference to the embodiments and drawings, but the embodiments of the present invention are not limited thereto. Figure 1 and Figure 2 show the structure of the evaporative condenser of the present invention, the evaporative condenser comprises a coil heat exchanger 1, a fan 2, a water pump 3, a water distributor 4, a sump 5 and a frame 6; The heat exchanger 1 is composed of a plurality of serpentine coils formed by a plurality of serpentine coils through an inlet header 9 and an outlet header! Each heat exchange fin includes a longitudinal serpentine (S-shaped) coil 7 and a packing 8 disposed between the planar spaces formed by the serpentine coils, and the packing and the coil form a tight fit structure, that is, the coupling therebetween Connected to form a segment structure. The coil is longitudinally disposed, that is, the cooling wind blown by the fan flows along the approximate length direction of the straight pipe section of the coil (the two do not need to be completely parallel); basically, the cooling wind is from each heat exchange tube The formed planar space is swept flat, and the coil 7 is provided with at least one piece of packing 8 for guiding the cooling water from the upper heat exchange tube to the lower heat exchange tube.

Wherein, the serpentine coil 7 is formed by continuous S-shaped bending of the heat exchange tubes, wherein the straight sections of the heat exchange tubes 71 are substantially parallel. The coil 7 can also be of a formable packing and suitable for use in other shapes within the evaporative condenser. The heat exchange tube of the serpentine coil 7 can be made of a copper tube, a stainless steel tube or a galvanized steel tube, and the cross section of the inner flow passage is circular, elliptical, spiral, corrugated and olive-shaped. As can be understood by those skilled in the art, the inner and outer surfaces of the serpentine coil 7 can adopt a smooth surface, preferably an enhanced heat transfer surface provided with internal and external threads, while the outer surface of the serpentine coil is provided with hydrophilic or anticorrosive. coating. Each serpentine coil has an inlet and an outlet for the flow passage.

Figures 3 and 4 show the construction of a heat exchange fin, comprising a coil 7 and a packing 8, having a structure in which a piece of packing 8 is formed in continuous coupling with the coil 7. As shown in the figure, the filler of the one piece corresponds to the heat exchange tube 71 of the corresponding position coil, and a plurality of grooves 81 matched with the size are provided, and the heat pipe is replaced by ffi. When installing, it is only necessary to directly attach a piece of filler to the surface of the heat exchange tube of the serpentine coil in a snapping manner, and of course, it can also assist other fixed connections. After installation, the above-mentioned piece of packing 8 completely covers one side surface of the heat exchange tube of the coil 7. The filler 8 is made of a metal material such as, but not limited to, rubber (PV, PP, PE, etc.), paper or aluminum foil, copper foil, etc. The filler 8 may be a flat plate filler having a smooth surface, or may be a unidirectional or multi-directional corrugated packing; the cross-sectional shape may be wavy, rectangular or oblong, wherein preferably one or both sides of the filler are formed with undulating convex and concave surfaces to facilitate the flow of spray cooling water. And increase the residence time of the cooling water on the surface of the filler, and correspondingly increase the evaporation heat exchange area.

Preferably, another type of filler and coiled structure may be used. The packing 8 is two sheets which are fitted to each other on both side surfaces of the serpentine coil in a snap-fit manner to form a continuous coupling. The two sheets of packing 8 can enclose the heat exchange tubes 71 of the coils, or a certain gap can be left at the joint of the two sheets of packing 8, as shown in Fig. 5, the gap can allow a cooling water to flow through The surface of the heat exchange tube.

During operation, the high temperature fluid enters the coil heat exchanger 1 through the inlet header 9 at this time, and the water pump 3 delivers the low temperature water in the sump 5 to the water distributor 4 at the top of the serpentine coil 7 and sprays it into a serpentine shape. The outer surface of the coil forms a very thin water film, and the longitudinal serpentine coil combined with the packing 8 allows the cooling water to flow through the surface of the upper heat exchange tube 71 and then flows to the surface of the lower heat exchange tube under the guidance of the packing to realize the guided water sowing. . At the same time, the fan 2 introduces the wind with lower temperature and relative humidity into the space where the evaporative condenser is located, and performs sufficient heat exchange with the heat exchanger and the cooling water flowing through the heat exchanger and the packing, and part of the water in the water film. After the heat is absorbed, it evaporates, and the rest falls into the collecting basin, and the water supply pump is circulated, and the high-temperature fluid is cooled to a low-temperature fluid and then flows out from the outlet header 10.

In Fig. 6-8, the present invention can also provide another evaporative condenser with a packing structure, including a coil heat exchanger 1, a fan 2, a water pump 3, a water distributor 4, a sump 5, and a frame 6; The heat exchanger 1 is composed of a plurality of heat exchanger fins formed by a plurality of serpentine coils connected through an inlet header 9 and an outlet header 10. Each of the heat exchange fins comprises a longitudinal serpentine (S-shaped) coil 7 and a packing 8, and the packing 8 is disposed between the adjacent heat exchange tubes 71 to form a gap coupling, that is, filling the heat exchange tubes 71 through the packing 8. The gap between them is to connect the coil 7 and the packing 8 into a continuous flow surface. Regarding the connection method, the above-mentioned filler 8 can be fixed between the coil 7 and the packing 8 by welding, snapping or connecting means between the heat exchange tubes of the coil 7. For example, the connector is a strap F, and one or more fixing holes are formed at the edge of the filler 8, and a strap is passed through the fixing hole to firmly bind it to the corresponding heat exchange tube 71. If the heat transfer tube of the coil is a circular tube or an elliptical tube, the snapping mode can also be selected, that is, the edge of the packing is set as a U-shaped groove, so that the heat exchange tube of the coil is securely accommodated therein. The packing disposed between the adjacent heat exchange tubes may be one piece or a plurality of pieces.

The coil in the above embodiment may also adopt other structures. For example, in the heat exchange fins shown in FIG. 9, the straight pipe sections of the heat exchange tubes 71 of the coil 7 are parallel to each other, and the pipe pitch is gradually reduced from the upper layer to the lower layer. Accordingly, the radius of curvature of the curved portion of the heat exchange tube 71 is also gradually reduced, and the manner of connecting the filler 8 and the coil 7 can be referred to the above embodiment. In the middle, the upper heat exchange tube 71 first receives the cold water, then flows from top to bottom to the lower heat exchange tube 71; when the high temperature refrigerant enters from the inlet Then, when flowing out from the outlet, since the temperature of the refrigerant in the upper layer is higher than the temperature of the lower layer, the temperature of the water passing through the upper heat exchange tube 71 rises more than the temperature of the water passing through the heat exchange tube 71 of the next layer. Higher, so the upper layer of the packing 8 is lengthened to extend the heat exchange time of the cooling water in the packing 8. The coil of the structure can reduce the temperature difference between the lower heat exchange tube and the cooling water, thereby improving the heat exchange effect between the heat exchange tube and the cooling water, and is superior. Alternatively, the coil shown in Fig. 10, the straight section of the heat exchange tube 71 of the coil has a downward slope along the flow direction of the liquid in the tube, and the liquid in the tube is a high temperature refrigerant. When the high temperature refrigerant recognizes the inlet, the refrigerant flows in a downward slope direction until the outlet flows out. Since the heat exchange tube 71 has a certain downward slope along the direction of the flow, the coil more prominently reduces the pressure drop of the refrigerant from the inlet to the outlet.

In order to obtain more cooling water heat exchange area, FIG. 1 is a schematic cross-sectional view showing another condenser of the present invention for adding a heat exchange filler, in which the serpentine coil 7 in the heat exchanger 1 is exchanged. One or more pieces of packing 8' may be provided at the top of the heat exchanger or at the bottom of the heat exchanger. 12a, 12b, and 12c are views showing the structure of a condenser provided with a uniform wind structure and a flywater prevention structure of the present invention. When the packing is placed in the lower layer of the evaporative condenser, the wind resistance of the lower layer space is greater than the wind resistance of the upper layer space, which is disadvantageous for the heat exchange between the lower layer packing and the water. Therefore, a uniform wind structure 12 may be disposed at one end of the packing at the inlet end of the upper space of the heat exchanger 1 to balance the wind resistance of the lower space and the upper space. In the prior art, there are a plurality of applicable equalizing devices. For example, as shown in FIG. 12b, the equalizing device is integrally formed by the packing 8", and is disposed on the inlet side of the evaporative condenser, and each The packing 8" is aligned with the corresponding heat exchange fins to leave an unobstructed passage for cooling the incoming air; the means of attachment between the packings may be, but is not limited to, being integrated by perforations. It is also possible to select the anti-flying structure 13 on the packing on the other side. The function of the anti-flying structure is: When the wind blows from left to right, the water flow from top to bottom has a tendency to flutter to the right with the wind. At this time, an upward dovetail structure is provided at the right end of the packing 8", and the water flow It will return to the left and participate in heat exchange under the blockage of the dovetail structure. Of course, as will be understood by those skilled in the art, any feasible uniform wind structure and anti-flying structure of the prior art can be selected.

The placement of the fan of the present invention can be implemented in a variety of ways, exemplified by, but not limited to, the following.

Fig. 13 is a view showing the structure of the evaporative condenser for placing the fan at the front of the heat exchanger, which is different from the first embodiment in that the fan 2 is placed at the front (air inlet) of the heat exchanger 1. Fig. 14 is a view showing the structure of the evaporative condenser in which the fan is vertically placed, which is different from the embodiment 1 in that the fan 2 is placed vertically.

Fig. 15 is a view showing another configuration of the evaporative condenser for vertically placing the fan. The difference from the embodiment 1 is that the fan 2 is placed vertically, and two sets of heat exchangers are disposed in the condenser.

Figure! Another embodiment of an evaporative condenser having two sets of heat exchangers is also shown. The heat exchange tubes of the heat exchanger used in the embodiment are not equal in length, that is, the length of the straight pipe section of the heat exchange tube 71 of the coil is gradually increased from the upper layer to the next layer, wherein the upper heat exchange tube 71 first The sprayed cold water is received, and then flows from top to bottom to the heat exchange tubes 71 located in the lower layer. The heat exchange fins provided in this embodiment are more suitable for evaporative condensers using two sets of heat exchangers. The difference from the embodiment shown in Fig. 15 is that this embodiment can install a fan of a larger size and horsepower by changing the length of the straight pipe section of the heat transfer pipe 71 without changing the outer dimensions of the condenser. Wherein, the fan 2 of the solid line part is the heat exchange tube piece provided by the embodiment, and the fan 2' of the broken line part is the heat exchange tube piece of the heat exchange tube of the equal length straight pipe section shown in FIG. . In comparison, the fan used in the former (solid line) is larger than the fan (virtual line) used in the latter, which increases the air volume and thus improves the heat transfer effect.

It is to be noted that the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and the present invention may also be modified by materials or structures, or by technical equivalents. Therefore, equivalent structural changes made by the description and illustration of the present invention, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

Rights demand letter

1 - A packed-coupled coil evaporative condenser, including a coil heat exchanger, a fan, a water pump, a water distributor, a water collecting tank and a frame; the coil heat exchanger consists of multiple heat exchange segments through an inlet The header is connected to the outlet header, and is characterized in that: the heat exchange tube segments include coils and fillers;

The coil is provided with at least one piece for guiding the spray cooling water to flow from the upper heat exchange tube to the lower heat exchange tube.

'

2. The evaporative condenser according to claim 1, wherein the heat exchange tubes of the coil are bent in an S-shape; and the filler is arranged between the adjacent heat exchange tubes to The heat exchange tubes are connected into a continuous water surface.

3. The evaporative condenser according to claim 2, wherein the straight pipe sections of the adjacent heat exchange tubes are parallel to each other, the tube spacing of the straight pipe sections of the adjacent heat exchange tubes is equal to each other, or the tube spacing is located at The upper layer that receives spray cooling water first becomes smaller gradually to the lower layer that receives spray cooling water last.

4. The evaporative condenser according to claim 2, wherein the straight section of the heat exchange tube has a downward slope along the direction of liquid flow in the tube.

5. The evaporative condenser according to any one of claims 1 to 4, characterized in that the coil is arranged longitudinally, that is, the cooling air blown by the fan is along the approximate length of the straight section of the coil direction flow.

6. The heat exchange tube piece according to any one of claims 1 to 5, characterized in that the length of the straight section of the heat exchange tube is from the upper layer which receives the cooling water spray first to the upper layer which receives the cooling water spray last. The lower layer gradually increases.

7. The evaporative condenser according to claim 1, wherein the heat exchange tubes of the coil are bent in an S-shape; the filler is arranged in the plane space formed by the heat exchange tubes, and is in contact with the heat exchange tubes. The heat exchange tubes are fixedly connected to each other and continuously cover at least part of the surfaces of the plurality of heat exchange tubes.

8. The evaporative condenser according to claim 6, characterized in that one or more pieces of the filler are attached to the heat exchange tube in a snap-fitting manner.

9. The evaporative condenser according to any one of claims 1 to 8, characterized in that: one or more pieces of filler are provided at the top of the heat exchanger and/or at the bottom of the heat exchanger, and/or there are One or more pieces of filler are added between the heat exchange tube segments of the heat exchanger.

10. The evaporative condenser according to any one of claims 1 to 9, characterized in that: the filler at one end of the heat exchanger is provided with an air uniformity structure for air inlet, and the filler at the other end is provided with an anti-flying water structure.