Longitudinal finned tube heat exchanger with built-in heat exchange jacket and nozzle and closed cooling tower

Abstract

The present application relates to longitudinal finned tube heat exchanger with built-in heat exchange sleeve and nozzle and its cooling tower, comprising heat exchange array with several longitudinal finned tube heat exchange units, flow divider, sprinkling water distributor, liquid collector. By setting heat exchange tube for counter flow heat exchange inside longitudinal finned tube, the heat exchange efficiency of heat exchanger is greatly improved, by setting upper connection assembly with uniform sprinkling on longitudinal finned tube, the uniformity and surface film forming property of sprinkling water are improved, so that the comprehensive heat exchange performance of heat exchanger in indirect evaporation process is greatly improved. The closed cooling tower prepared by using the longitudinal finned tube heat exchanger of the present application has the advantages of small volume, large refrigerating capacity and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of indirect evaporative cooling heat exchanger and evaporative cooling, in particular to the longitudinal finned tube heat exchanger with built-in heat exchange sleeve and nozzle applied to fluid cooling and the closed cooling tower with the built-in heat exchanger. BACKGROUND

[0002] The closed cooling tower has many advantages such as clean, water saving, energy saving, direct cooling supply to the end, etc., but also has disadvantages such as high cost, large volume, heavy, etc. These disadvantages are because the efficiency of the column tube heat exchanger used in the conventional closed cooling tower is low, the surface area is not large enough, the water spraying is rough and uneven, causing uneven distribution of liquid film on the filler and the surface of the heat exchanger, so the water evaporation efficiency of the conventional closed cooling tower on the filler and the surface of the heat exchanger is not high, and the heat exchange efficiency is also poor. In order to achieve the corresponding cooling effect, the equipment must be large. The research and development of closed cooling tower focuses on improving the water flow, air flow distribution efficiency, and water evaporation, heat transfer efficiency, etc. The longitudinal finned tube heat exchanger used in the closed cooling tower has the advantages of long counterflow heat exchange stroke, high heat transfer efficiency, small wind resistance, high wind speed, etc., but a series of problems need to be solved, such as high cost of finned tube processing, complex water flow distribution inside the heat exchanger, uniformity of water spraying, etc. SUMMARY

[0003] The longitudinal finned tube heat exchanger with built-in heat exchange sleeve and nozzle of the present application uses a longitudinal finned tube heat exchanger with built-in heat exchange tube. Each finned tube has an independent spraying module in addition to the built-in heat exchange tube. The cold spraying water made by high-efficiency wet film is used to cool the cooled fluid through the built-in heat exchange sleeve. The finned tubes are connected by plug-in connectors for water distribution and internal heat exchange tube connection, and are fixed on the heat exchanger frame. The inlet and outlet water uses multi-stage water distribution design to ensure the uniformity of water flow distribution, so that the longitudinal finned tube heat exchanger with built-in heat exchange sleeve and nozzle has high evaporative heat exchange efficiency, small wind resistance, large ventilation volume, large fin surface area, and good film forming property after hydrophilic treatment of the surface. The closed cooling tower with the longitudinal finned tube heat exchanger as the evaporative cooling heat exchanger has the advantages of small volume and large refrigerating capacity.

[0004] The technical scheme of the embodiment of the present application is as follows:

[0005] The longitudinal finned tube heat exchanger with built-in heat exchange sleeve and nozzle,

[0006] The longitudinal finned tube heat exchanger with built-in heat exchange sleeve and nozzle,

[0007] The longitudinal finned tube heat exchanger unit is composed of an upper connection assembly integrated with a nozzle, a longitudinal finned tube, a heat exchange tube, and a lower connector.

[0008] The upper part of the heat exchange pipe is connected with the spray head of the upper connecting assembly through the internal pipeline of the upper connecting assembly, the lower part of the heat exchange pipe is connected with the spray water collector through the internal pipeline of the lower connecting piece, and the middle part of the heat exchange pipe is arranged in the longitudinal finned tube base pipe of the longitudinal finned tube;

[0009] The upper end of the upper connecting assembly is communicated with the flow divider, and the lower end of the upper connecting assembly is communicated with the longitudinal finned tube base pipe and the heat exchange pipe respectively; the spray head of the upper connecting assembly is arranged in alignment with the longitudinal fin, and the spray head is communicated with the heat exchange pipe through the internal pipeline of the upper connecting assembly;

[0010] The lower connecting piece is arranged below the longitudinal finned tube base pipe, the upper end of the lower connecting piece is communicated with the heat exchange pipe and the finned tube base pipe respectively, the liquid collector is communicated with the finned tube base pipe through the lower connecting piece, and the spray water collector is communicated with the heat exchange pipe through the lower connecting piece.

[0011] The structure of the upper connecting assembly and the lower connecting piece is further optimized, the number and depth of the spray channel are optimized, and the surface treatment is performed on the longitudinal finned tube heat exchanger.

[0012] Overall, the specific technical effects of the longitudinal finned tube heat exchanger are as follows:

[0013] (1) Compared with the conventional indirect evaporative heat exchanger, the present application not only performs indirect evaporation, but also performs counterflow heat exchange, so that the heat exchange efficiency is greatly improved.

[0014] (2) The upper connecting assembly arranged on the longitudinal finned tube can uniformly spray, so that the uniformity and surface film forming performance of the spray water are improved, the efficiency of indirect evaporation is improved, and the heat exchange performance of the whole heat exchanger is improved.

[0015] (3) Compared with the conventional horizontal finned tube heat exchanger for indirect evaporation, the air resistance is small, and the cleaning is easy.

[0016] The present application further discloses a closed cooling tower based on the longitudinal finned tube heat exchanger, and the closed cooling tower is improved from a series of angles. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a cross-sectional structure schematic view of the embodiment of the longitudinal finned tube heat exchanger of the present application;

[0018] Figure 2 It is a cross-sectional structure schematic view of the upper connecting assembly of the embodiment of the present application;

[0019] Figure 3 It is a cross-sectional structure schematic view and a side view of the spray head of the embodiment of the present application;

[0020] Figure 4 Cross-sectional structure diagram of another scheme of the upper connecting assembly of the embodiment of the present application;

[0021] Figure 5 Cross-sectional structure diagram of the lower connecting piece of the first embodiment of the present application;

[0022] Figure 6 Structure diagram of the flow divider of the embodiment of the present application;

[0023] Figure 7 Schematic diagram of the working principle of the first embodiment of the present application;

[0024] Figure 8 Structure diagram of the one-to-two and one-to-four water distributors of the present embodiment

[0025] Figure 9 Structure diagram of the one-to-two water distributor of the present embodiment transitioning to the one-to-three water distributor

[0026] Figure 10 Structure diagram of the one-to-three water distributor of the present embodiment transitioning to the one-to-three water distributor

[0027] Figure 11 Structure diagram of the one-to-four water distributor of the present embodiment transitioning to the one-to-three water distributor

[0028] Figure 12 Structure diagram of the second embodiment of the present application;

[0029] Figure 13 Cross-sectional structure diagram of the lower connecting piece of the second embodiment of the present application;

[0030] Figure 14 Structure diagram of the third embodiment of the present application;

[0031] Figure 15 Structure diagram of the fourth embodiment of the present application;

[0032] Figure 16 Structure diagram of the second water collecting tank of the embodiment of the present application;

[0033] Figure 17 Structure diagram of the fifth embodiment of the present application;

[0034] 10 air outlet, 20 fan, 30 water collecting module, 40 longitudinal finned tube heat exchanger with built-in heat exchange sleeve and spray head, 410 heat exchange array, 411 upper connecting assembly,

[0035] 4111 upper connecting flow director, 4112 first inner sleeve, 4113 spray head, 4114 spray limiting device, 4115 cooled fluid inlet joint, 4116 spring,

[0036] 413 longitudinal finned tube, 4131 longitudinal fin, 4132 longitudinal finned tube base pipe, 414 heat exchange tube, 416 lower connecting piece,

[0037] 4161 lower connecting flow guide, 4162 second inner sleeve, 4163 lower connecting joint, 4164 cooled fluid outlet joint, 4165 spray water inlet joint,

[0038] 420 flow distributor, 421 flow distributor inlet port, 422 flow distributor flow equalizer trunk component, 423 flow distributor flow equalizer branch component, 424 flow distributor distribution hole,

[0039] 430 spray water distributor, 440 collector,

[0040] 50 first wet membrane, 51 second wet membrane, 511 water distributor, 60 air inlet, 70 first spray water pump, 71 second spray water pump, 80 first water collector, 801 first water replenishing valve, 802 first automatic blowdown device, 81 second water collector, 811 second water replenishing valve, 812 second automatic blowdown device, 813 partition, 814 filter screen, 815 baffle, 90 air precooling surface cooler. DETAILED DESCRIPTION

[0041] In order to facilitate the understanding of the present application, a more complete understanding of the present application can be had by reference to the following description and the accompanying drawings, in which preferred embodiments of the present application are illustrated. The present application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

[0042] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0044] The longitudinal finned tube heat exchanger of the embodiment of the present application is applied to the field of indirect evaporation and is used for indirect evaporation cooling of a cooled fluid, in particular, is applied to a closed cooling tower and is used for indirect heat exchange of the cooled fluid by the closed cooling tower. The cooled fluid can be gaseous or liquid fluid. When the cooled fluid is gaseous fluid, the gap size between the longitudinal finned tube base pipe and the heat exchange tube is adaptively increased; when the cooled fluid is liquid fluid, the gap size between the longitudinal finned tube base pipe and the heat exchange tube is adaptively reduced. The embodiment of the present application generally mainly cools liquid fluid, but is not limited to the case of protecting liquid fluid from indirect evaporation cooling.

[0045] First embodiment:

[0046] As shown in Figure 1 The longitudinal finned tube heat exchanger 40 of the embodiment is used for indirect evaporation cooling of a cooled fluid (gas, liquid) and is a sectional view of the heat exchanger. The longitudinal finned tube heat exchanger 40 comprises an array 410 of a plurality of longitudinal finned tube heat exchange units (referred to as a heat exchange array), a heat exchanger frame, a flow divider 420, a spray water distributor 430, and a liquid collector 440. The heat exchange array 410, the flow divider 420, the spray water distributor 430, and the liquid collector 440 are fixed on the heat exchanger frame; the flow divider 420, the heat exchange array 410, the spray water distributor 430, and the liquid collector 440 are sequentially connected from top to bottom. The spray water distributor 430 is arranged above the liquid collector 440.

[0047] The heat exchange array 410 is a square array and is composed of m*n longitudinal finned tube heat exchange units. One side of the square array is m longitudinal finned tube heat exchange units and the other side is n longitudinal finned tube heat exchange units. The number of finned tube heat exchange units is adjusted according to the design flow and flow rate. m and n are natural numbers.

[0048] The heat exchange array 410 can also be designed into an elliptical array or a circular array according to the application environment of the longitudinal finned tube heat exchanger.

[0049] The longitudinal finned tube heat exchange unit is composed of an upper connecting assembly 411 integrated with a spray head, a longitudinal finned tube 413, a heat exchange tube 414, and a lower connecting piece 416.

[0050] The upper part of the heat exchange tube 414 is connected to the spray head of the upper connecting assembly 411 through the internal pipeline of the upper connecting assembly 411, the lower part of the heat exchange tube 414 is connected to the spray water distributor 430 through the internal pipeline of the lower connecting piece 416, and the middle part of the heat exchange tube 414 is arranged inside the longitudinal finned tube base pipe 4132 of the longitudinal finned tube 413; the heat exchange tube 414 is used for cooling the cooled fluid inside the longitudinal finned tube base pipe 4132 by the spray water flowing inside the heat exchange tube.

[0051] The upper end of the upper connecting assembly 411 communicates with the flow divider 420, and the lower end of the upper connecting assembly 411 communicates with the longitudinal finned tube base pipe 4132 and the heat exchange pipe 414, respectively; the nozzle 4113 of the upper connecting assembly 411 is arranged in alignment with the longitudinal fin 4131, and the nozzle 4113 communicates with the heat exchange pipe 414 through the internal pipeline of the upper connecting assembly 411; the nozzle 4113 is used for spraying water on the longitudinal fin 4131, the gap between the longitudinal fins 4131 is used for the flow of external air, and the longitudinal fin 4131 is used for the sprayed water to flow on the longitudinal fin, evaporate, and cool the cooled fluid in the longitudinal finned tube base pipe 4132.

[0052] The lower connecting piece 416 is arranged below the longitudinal finned tube base pipe 4132, the upper end of the lower connecting piece 416 communicates with the heat exchange pipe 414 and the finned tube base pipe 4132, respectively, the liquid collector 440 communicates with the finned tube base pipe 4132 through the lower connecting piece 416, and the sprayed water distributor 430 communicates with the heat exchange pipe 414 through the lower connecting piece 416. The lower connecting piece 416 is used for leading the cooled fluid from the gap between the longitudinal finned tube base pipe 4132 and the heat exchange pipe 414 downward to the liquid collector 440, while leading the sprayed water from the sprayed water distributor 430 to be introduced into the heat exchange pipe 413.

[0053] When the longitudinal finned tube heat exchanger works, the sprayed water enters the array composed of the finned tube heat exchange units from the sprayed water distributor, sequentially passes through the inside of the lower connecting piece of the longitudinal finned tube heat exchange unit, the inside of the heat exchange pipe, the internal pipeline of the upper connecting assembly, the nozzle, and finally is sprayed on the longitudinal fin through the nozzle; the cooled fluid enters the array composed of the finned tube heat exchange units from the flow divider, sequentially passes through the inside of the upper connecting assembly of the longitudinal finned tube heat exchange unit, the gap space between the longitudinal finned tube base pipe and the heat exchange pipe, the inside of the lower connecting piece, and the liquid collector, and finally flows out through the liquid collector; before the sprayed water is sprayed, the sprayed water and the cooled fluid perform counterflow heat exchange on the wall of the heat exchange pipe.

[0054] The embodiment of the present application realizes the counterflow heat exchange between the sprayed water and the cooled fluid before the sprayed water flows to the nozzle, greatly improves the heat exchange efficiency and the heat exchange capacity of the heat exchanger of the embodiment, by the sprayed water flowing in the heat exchange pipe and the cooled fluid flowing in the gap between the heat exchange pipe and the longitudinal finned tube base pipe. Simulation simulation proves that, under the same external environment, the heat exchange capacity of this heat exchanger is doubled relative to the case without counterflow heat exchange.

[0055] Preferably, the upper connecting assembly 411 of the embodiment of the present application is as shown in Figure 2 The upper connecting assembly 411 is composed of an upper connecting flow guide 4111, a T-shaped first inner sleeve 4112, a nozzle 4113, and a sprayed water limiter 4114.

[0056] AsFigure 3 The figures show a cross-sectional view and a side view of the nozzle 4113. The nozzle 4113 has a hollow structure that is wider at the top and narrower at the bottom. Specifically, the nozzle 4113 is integrally formed from top to bottom by a first cylindrical member 4113a with concave grooves on its outer surface, a second cylindrical member 4113b, a third cylindrical member 4113c with a frustum-shaped outer surface, and a fourth cylindrical member 4113d with several limiting strips 4113e inside. The lower part of the upper part of the nozzle 4113 is nested inside for inserting the upper connecting guide 4111; the lower part of the nozzle 4113 is nested inside for inserting the heat exchange tube 414; the lower part of the nozzle 4113 is connected to the upper part of the finned tube base tube 4132 by insertion, for inserting into the finned tube base tube 4132; the outer surface of the top of the nozzle has several concave grooves to serve as spray water channels.

[0057] The first inner sleeve 4112 is composed of a first branch unit distributed laterally, a second branch unit distributed laterally, and a third branch unit distributed vertically. It is a tubular structure. The third branch unit is connected to both the first and second branch units and is used to introduce the spray water of the heat exchange tube 414 from the third branch unit into the first and second branch units.

[0058] The upper end of the upper connecting guide 4111 is connected to the distributor 420, and the lower part of the upper connecting guide 4111 is nested within the first inner sleeve 4112. The lower part of the upper connecting guide 4111 is wrapped by the upper part of the nozzle 4113 and is positioned above the internal support surface of the nozzle 4113.

[0059] The spray limiter 4114 is arranged around the connecting guide 4111 and the nozzle 4113, and wraps the first inner sleeve 4112. The first branch unit and the second branch unit of the first inner sleeve are connected to the inside of the spray limiter, and are used to lead the spray water from the first branch unit and the second branch unit into the spray limiter and spray it onto the longitudinal fins 4131 through the nozzle 4113.

[0060] Preferably, such as Figure 2 As shown, the upper connecting assembly 411 is also provided with a cooled fluid inlet connector 4115, one end of which is provided with a groove and a thread to facilitate connection with the distributor 420, and the other end is provided with a thread to facilitate connection with the upper connecting guide 4111 of the upper connecting assembly 411. The cooled fluid inlet connector facilitates the connection between the upper connecting guide and the distributor.

[0061] Preferably, such as Figure 4As shown, the upper connecting assembly 411 is further provided with a spring 4116 arranged above the spray limiter 4114, which is used to adjust the height of the spray limiter 4114 with the change of the spray water pressure, so as to adjust the size of the spray water. The spray limiter of the embodiment realizes the elastic adjustment of the spray amount by the spring. When the spray water pressure is large, the spray amount is large, and the spray water droplets are large. When the spray water pressure is small, the spray amount is small, and the spray water droplets are small. In other embodiments, the spray limiter can not be provided with a spring, and only the spray limiter 4114 is reserved. The spray limiter 4114 is fixed on the upper connecting flow director 4111 by a threaded connection or a glue connection.

[0062] Preferably, 20-60 spray channels are uniformly arranged on the top of the spray head 4113, and the depth of the spray channel is between 0.1mm-0.2mm. Preferably, the number of spray channels of the spray head 4113 is more than 2 times the number of longitudinal fin books of the longitudinal finned tube, so that each longitudinal fin has at least 2 spray channels corresponding to spray, improving the uniformity of the spray.

[0063] As shown, Figure 5 The lower connecting piece 416 includes a lower connecting flow director 4161, a T-shaped second inner sleeve 4162, and a lower connecting joint 4163. The upper part of the lower connecting flow director 4161 is connected with the lower connecting joint 4163, the middle part of the lower connecting flow director 4161 is nested with the second inner sleeve 4162, and the lower part of the lower connecting flow director 4161 is connected with the liquid collector 440.

[0064] The second inner sleeve 4162 is composed of a vertically distributed fourth branch unit, a transversely distributed fifth branch unit, and a transversely distributed sixth branch unit. The fourth branch unit is in communication with the fifth branch unit and the sixth branch unit, and is used to introduce the spray water of the heat exchange pipe 14 from the fifth branch unit and the sixth branch unit into the fourth branch unit.

[0065] The lower connecting joint 4163 is composed of a lower connecting upper cylinder with two different diameters, a lower connecting lower cylinder, and a support wall connecting the lower connecting upper cylinder and the lower connecting lower cylinder. The heat exchange pipe 414 is placed in the inside of the lower connecting upper cylinder. The lower end of the heat exchange pipe 414 is connected with the fourth branch unit of the second inner sleeve 4162 in a plug-in manner. The inner wall of the lower connecting upper cylinder is used to insert the heat exchange pipe 414 into the fourth branch unit. The inner diameter of the lower connecting upper cylinder is larger than the outer diameter of the heat exchange pipe 414. The outer wall of the lower connecting upper cylinder is connected with the longitudinal finned tube base pipe 4132 in a plug-in manner, which is used to insert the longitudinal finned tube base pipe 4132. The outer wall of the lower connecting upper cylinder is in a tight fit connection with the longitudinal finned tube base pipe. The lower connecting lower cylinder is used to be inserted into the upper part of the lower connecting flow director 4111.

[0066] Preferably, as Figure 1As shown, two adjacent longitudinal finned tube heat exchange units are connected to each other by means of the fifth branch unit and the sixth branch unit of the transverse distribution of the second inner sleeve of the corresponding lower connecting member. In this way, the spray water distributor 430 only needs to be arranged at both ends of the longitudinal finned tube heat exchanger to complete the spray water distribution, the water distribution distance is short, and the resistance is small. In addition, the two adjacent longitudinal finned tube heat exchange units are connected by meansing the plug-in connection, which enhances the firmness of the longitudinal finned tube heat exchanger as a whole, so that it is not easy to deform.

[0067] Preferably, a threaded cooling fluid outlet connector 4164 is further arranged at the lower part of the lower connecting flow distributor 4161, which is used for connecting the lower connecting flow distributor 4161 and the second cooled fluid flow distributor of the collector 40.

[0068] Preferably, the shunt of the embodiment of the present application is as shown in Figure 6 As shown, the shunt 420 is composed of a shunt inlet port 421, a shunt flow distributor main component 422, a shunt flow distributor branch component 423, and a shunt liquid distribution hole 424, which is in communication with the upper part of the upper connecting flow distributor 4111 (or the cooling fluid inlet connector) of the upper connecting assembly 411. The liquid to be cooled enters the heat exchanger through the upper connecting assembly 411 of the longitudinal finned tube through the liquid distribution hole 424 arranged below the flow distributor main component 422 and the flow distributor branch component 423 from the inlet port 421.

[0069] Preferably, in other embodiments of the present application, the shunt 420 adopts a layered tubular staged water distribution manner for water distribution. The water distributor is composed of a liquid port and M-level staged water distribution units; the N-level staged water distribution unit is composed of an N-level water distributor and a water distribution pipe (as shown in Figure 8 As shown, the water flows out of the water distributor to the water distribution pipe from the A port and flows out from the B port); the N-level water distributor is a one-to-two water distributor or a one-to-three water distributor or a one-to-four water distributor (as shown in Figure 8 a schematic diagram of a one-to-two or one-to-four water distributor); the N-level staged water distribution unit distributes the water in the upper-level staged water distribution unit to the water distribution pipe of the N-level staged water distribution unit through the N-level water distributor; the N-1-level staged water distribution unit connects the N-level water distributor of the N-level staged water distribution unit through the water distribution pipe of the N-1-level staged water distribution unit; and the M-level staged water distribution unit connects the liquid connector of the finned tube heat exchange unit through the water distributor of the M-level staged water distribution unit. Figure 9 、 Figure 10 、 Figure 11For the structure diagram of transition from one-to-two water distributor to one-to-three water distributor, from one-to-three water distributor to one-to-three water distributor, from one-to-four water distributor to one-to-three water distributor, through such water distribution, each layer of water can be uniformly distributed to the next layer through one-to-two (or one-to-three or one-to-four) in a symmetrical manner, and each layer of water distribution is uniformly and symmetrically distributed, so that the path and resistance of each layer of water inlet and outlet are completely consistent, realizing uniform water distribution and ensuring the uniformity of liquid separation and collection. (1≤N≤M, N and M are natural numbers)

[0070] Preferably, the liquid collector 440 is arranged in reference to the structure of the flow divider 420, and the to-be-cooled liquid is introduced into the liquid collector through the liquid distribution hole.

[0071] Preferably, the liquid inlet position of the spray water distributor 430 is as shown in Figure 1 The spray water distributor 430 is arranged on both sides of the heat exchange array 410, and the second inner sleeve 4162 of the connected longitudinal finned tube is sequentially connected through the transversely distributed fifth branch unit and sixth branch unit, and the spray water distributor 430 flows through different longitudinal finned tubes through the second inner sleeve 4162 of the longitudinal finned tube in sequence, so as to realize spray water inlet.

[0072] Preferably, in other embodiments, the liquid inlet position of the spray water distributor 430 is as shown in Figure 6 The spray water is introduced into each second inner sleeve 4162 of the longitudinal finned tube through the branch pipeline of the spray water distributor and the fifth branch unit and the sixth branch unit.

[0073] The working principle of the longitudinal finned tube heat exchanger is as shown in Figure 7 The air sequentially passes through the liquid collector 440, the spray water distributor 430, the heat exchange array 410, and the flow divider 420, so as to realize cooling of the heat exchange array 410; the spray water sequentially passes through the spray water distributor 430, the longitudinal finned tube heat exchanger 414, the spray head 4113 of the upper connecting assembly 411, and the longitudinal fin 142, first flows through the heat exchanger 414, and then sprays through the spray head 4113 of the upper connecting assembly 411; the cooled fluid sequentially passes through the flow divider 420, the upper connecting assembly 411, the gap between the longitudinal finned tube base pipe and the heat exchanger pipe, the lower connecting piece 416, and the liquid collector 440, and is introduced into the gap between the longitudinal finned tube base pipe and the heat exchanger pipe through the structure of the inner sleeve in the upper connecting assembly.

[0074] The longitudinal finned tube heat exchanger of the embodiment realizes countercurrent heat exchange between the spray water and the cooled fluid before the spray water flows to the spray head through the flow of the spray water in the heat exchanger pipe and the flow of the cooled fluid in the gap between the heat exchanger pipe and the longitudinal finned tube base pipe, so as to improve the heat exchange capacity and efficiency.

[0075] Preferably, the material of any of the longitudinal fin, the longitudinal fin tube base pipe and the heat exchange pipe is aluminum or aluminum alloy, and the longitudinal fin and the longitudinal fin tube base pipe are integrally formed. Compared with steel, copper and other materials, the longitudinal fin, the longitudinal fin tube base pipe and the heat exchange pipe are light in weight, thereby reducing the overall weight of the heat exchanger. The longitudinal fin and the longitudinal fin tube base pipe are integrally formed, thereby facilitating installation.

[0076] Preferably, the longitudinal fins are radially distributed on the longitudinal fin tube base pipe, the longitudinal fins close to the longitudinal fin tube base pipe are thick, and the longitudinal fins far from the longitudinal fin tube base pipe are thin. The gradually changing longitudinal fin structure is beneficial to increasing the heat exchange contact area and reducing the thermal resistance under the same volume of longitudinal fin, thereby improving the efficiency of the heat exchanger.

[0077] Preferably, the outer surface of the longitudinal fin tube is provided with a hydrophilic coating layer added with infrared radiation heat dissipation material. In this embodiment, the coating layer contains nano-silicon dioxide or nano-aluminum oxide, and contains transition metal oxides such as cobalt, nickel and manganese. The coating layer can improve the heat exchange efficiency of the evaporative cooling heat exchanger, and better absorb water droplets to form a water film, thereby increasing the evaporation efficiency of the sprayed water and improving the cooling capacity of the indirect evaporative fluid cooling device as a whole.

[0078] Embodiment two:

[0079] The difference between the embodiment two and the embodiment one of the present application lies in the structure of the lower connecting member 416, and the spray water distributor 430 is arranged below the liquid collector 440, as shown in Figure 12 .

[0080] Specifically, as shown in Figure 13 , the lower connecting member 416 is composed of a cross-shaped lower connecting flow guide 4161, a lower connecting joint 4163 and a spray water inlet joint 4165. The upper part of the lower connecting flow guide 4161 is connected with the lower connecting joint 4163, the left and right branches in the middle part of the lower connecting flow guide 4161 are respectively connected with the liquid collector 440 or the left and right branches in the middle part of the lower connecting flow guide 4161 of the adjacent longitudinal fin tube, the lower part of the lower connecting flow guide 4161 is connected with the upper end of the spray water inlet joint 4165 through threads, and the lower end of the spray water inlet joint 4165 is connected with the spray water distributor 430.

[0081] The lower connecting joint 4163 is composed of a lower connecting upper cylinder, a lower connecting lower cylinder, a support wall connecting the lower connecting upper cylinder and the lower connecting lower cylinder, and the inner wall of the lower connecting upper cylinder is used for inserting the heat exchange pipe 414 into the spray water inlet joint 4165, and the inner diameter of the lower connecting upper cylinder is larger than the outer diameter of the heat exchange pipe 414; the outer wall of the lower connecting upper cylinder is used for inserting the longitudinal finned tube base pipe 413, and the outer wall of the lower connecting upper cylinder is in tight fit connection with the longitudinal finned tube base pipe.

[0082] The second embodiment realizes the reverse flow heat exchange of the spray water and the cooled fluid before the spray water flows to the spray head, improves the heat exchange capacity and the heat exchange efficiency, and the lower connecting piece has no inner sleeve structure, is simple in structure, and is convenient to process.

[0083] Embodiment three:

[0084] As shown in Figure 14 , the embodiment includes a shell (not marked in the figure), an air outlet 10, a fan 20, a water collecting module 30, a longitudinal finned tube heat exchanger 40 with an inner heat exchange sleeve and a spray head (for details, refer to the description of the first embodiment and the second embodiment above), a first wet membrane 50, an air inlet 60, a spray water pump 70, and a first water collecting tank 80.

[0085] The first water collecting tank 80 includes a tank body, a first water supplement valve 801, and a first automatic sewage device 802. The first water supplement valve 801 is arranged at the middle upper part of the tank body of the first water collecting tank 80, is an automatic floating ball valve, and is used for automatic water supplement. The first automatic sewage device 802 is arranged at the bottom of the first water collecting tank and is composed of a sewage pipe, an electromagnetic valve, and a controller, can regularly open the electromagnetic valve to automatically discharge sewage through the sewage pipe according to a control program, and is used for discharging the sediment at the bottom of the first water collecting tank.

[0086] The fan 20 is used for making the air enter the first wet membrane 50, the longitudinal finned tube heat exchanger 40 with an inner heat exchange sleeve and a spray head, the water collecting module 30, and the air outlet 10 in sequence through the way of air suction.

[0087] The fan 20, the water collecting module 30, the longitudinal finned tube heat exchanger 40 with an inner heat exchange sleeve and a spray head, and the first wet membrane 50 are arranged in sequence along the air outlet direction.

[0088] The first wet membrane 50 is used for humidifying and cooling the air and cooling the spray water sprayed on the first wet membrane 50.

[0089] Preferably, the first wet membrane 50 is obliquely arranged between the longitudinal finned tube heat exchanger 40 with built-in heat exchange jacket and shower head and the first water collecting tank 80. By obliquely arranging the wet membrane, the windward area and surface area are increased, and the evaporation cooling efficiency of the wet membrane is improved.

[0090] Preferably, the first wet membrane is a paper or polymer synthetic material wet membrane with a certain thickness, so that the relative humidity of the air humidified by the wet membrane is not less than 95% (generally, the relative humidity is 95%-97%) when the fluid cooling device is in use, and the evaporation cooling process mainly occurs on the wet membrane, so that the air temperature after the wet membrane and the water temperature are both close to the wet bulb temperature of the air entering the wet membrane.

[0091] The embodiment improves the cooling capacity of the same volume cooling tower by arranging the longitudinal finned tube heat exchanger with built-in heat exchange jacket and shower head in the closed cooling tower, and simultaneously causing the reverse flow heat exchange and indirect evaporation on the longitudinal finned tube heat exchanger. In the embodiment, the same spray water flow actually achieves the double effects of reverse flow heat exchange and indirect evaporation heat exchange, improves the heat exchange capacity under the same spray water power, and reduces the energy consumption ratio of the cooling tower. The cooling tower of the embodiment has the advantages of small volume and large refrigerating capacity.

[0092] In the embodiment, the air entering the indirect evaporation heat exchanger first passes through the first wet membrane for cooling, and the first wet membrane also cools the spray water passing through the wet membrane, so that the air close to the wet bulb temperature and the spray water close to the wet bulb temperature can be obtained. The spray water is sent to the indirect evaporation heat exchanger to cause the reverse flow heat exchange and indirect evaporation heat exchange, the reverse flow heat exchange performance is further improved, the indirect evaporation heat exchange performance is slightly decreased, and the heat exchange performance of the whole indirect evaporation heat exchanger is improved. The air with lower temperature after passing through the wet membrane is used to enter the indirect evaporation heat exchanger, which improves the cooling capacity of the outdoor air to the liquid to be cooled and improves the cooling capacity of the cooling tower.

[0093] Embodiment Four:

[0094] The difference between the embodiment four and the embodiment three is that a second wet membrane 51 for washing the air entering the first wet membrane is added before the first wet membrane, as shown in Figure 15 .

[0095] Preferably, the first wet membrane 50 and the second wet membrane 51 are both arranged below the longitudinal finned tube heat exchanger 40 and are arranged at different horizontal inclination angles, so that the air passing through the second wet membrane can completely flow to the first wet membrane. A water distributor 511 is arranged at the top of the second wet membrane, and the water in the water collecting tank is pumped to the second wet membrane 51 by the second spray water pump 71. The second wet membrane 51 washes the air entering the first wet membrane, which plays a role of purifying the air and cooling the air, so that the temperature of the air entering the longitudinal finned tube heat exchanger is lower, and the cooling capacity of the cooling tower and the cleanliness of the evaporation cooling unit of the cooling tower are improved.

[0096] Preferably, as shown in the figure, the closed cooling tower is provided with a second water collecting tank 81 in addition to the first water collecting tank 80, and the second spray water pump draws water from the second water collecting tank. In the case where the second water collecting tank is not provided, the second spray water pump draws water from the first water collecting tank. Figure 15

[0097] Preferably, as shown in the figure, the second water collecting tank 81 is composed of a water tank body, a second water replenishing valve 811, a second automatic sewage device 812, a partition plate 813, a filter screen 814, and a baffle 815, and is divided into three areas A, B, and C. The position and type of the second water replenishing valve 811 and the second automatic sewage device 812 are consistent with those of the first water replenishing valve 801 and the first automatic sewage device 802. The second water replenishing valve 811 is arranged in the upper part of the C area, the water suction port of the second spray water pump 71 is arranged in the lower part of the C area, and the sewage inlet of the second automatic sewage device 802 is arranged at the bottom of the B area, so that the second automatic sewage device 802 can periodically discharge sewage from the second water collecting tank. Figure 16

[0098] The partition plate 813 is arranged obliquely, with one end close to the left bottom of the second water collecting tank and the other end arranged at the middle of the top edge of the second water collecting tank. The left side of the second water collecting tank and the partition plate constitute the first area A, which is used for preliminarily collecting the spray water flowing out of the wet membrane.

[0099] The filter screen 814 is preferably a 80-mesh stainless steel screen, which is arranged between the second and third areas of the second water collecting tank and further filters the spray water entering the third area.

[0100] The baffle 815 is used to block the precipitates at the bottom of the B area from entering the C area, so that the spray water in the B area is subjected to gravity sedimentation, and only the water that has not passed through the baffle 815 can enter the C area.

[0101] One end of the filter screen 814 is arranged at the middle of the top edge of the second water collecting tank, and the other end is arranged on the baffle 815.

[0102] By arranging the partition plate 813, the filter screen 814, and the baffle 815 in the second water collecting tank, the second water collecting tank can be divided into three areas, and the spray water flowing out of the wet membrane must pass through the partition plate 813, the filter screen 814, and the baffle 815 to enter the third area C, and is then sucked away by the second spray water pump. Through the blocking of the partition plate 813, the gravity sedimentation in the B area, the secondary blocking of the baffle 815, and the filtration of the filter screen 814, the water sucked out by the second spray water pump is relatively clean.

[0103] ​​The second water collecting tank with automatic pollution discharge device, partition, filter screen and baffle is further arranged below the second wet membrane. The automatic pollution discharge device regularly discharges the precipitates in the second water collecting tank. The settlement, gravity settlement and filtration ensure the purification degree of the water extracted by the second spraying water, so that the second wet membrane is not easy to be blocked, and the number of manual cleaning of the second wet membrane is reduced.

[0104] In other embodiments, the first water collecting tank can also be provided with the structure of the second water collecting tank. The filtration ensures the purification degree of the water extracted by the second spraying water, ensures the cleanliness of the cooling water system, and reduces the number of maintenance.

[0105] Embodiment five:

[0106] The difference between embodiment five and embodiment four is that an air precooling surface cooler 90 for precooling the air entering the wet membrane is added before the second wet membrane, as shown in Figure 17 .

[0107] The air precooling surface cooler 90 can be a coil or a radial finned tube type heat exchanger. Preferably, the air precooling surface cooler is a radial finned tube type heat exchanger. Preferably, by selecting the parameters of the radial finned tube, in this embodiment, the temperature of the external air flowing through the air precooling surface cooler is reduced by 2-10℃ (all-year working condition), and the temperature of the spraying water flowing through the air precooling surface cooler is increased by 1-5℃ (all-year working condition).

[0108] Preferably, the radial finned tube heat exchanger is composed of a coil and fins, as shown in Figure 17 . The fins on the radial finned tube heat exchanger are uniformly arranged, completely cover and uniformly divide the air flow space inside the radial finned tube heat exchanger, and are corrugated along the air flow direction or staggered along the air flow direction. The flow direction of the spraying water is countercurrent to the air flow direction between the layers of the radial finned tube heat exchanger. Such a radial finned tube heat exchanger has the best cooling effect on air.

[0109] The air precooling surface cooler 90 of this embodiment can be arranged in the air inlet direction outside the cooling tower, as shown in Figure 17 , or arranged in the air inlet direction inside the cooling tower. Preferably, a wind guide louver is arranged in front of the air precooling surface cooler to guide the wind and stabilize the flow.

[0110] In the embodiment, the air pre-cooling surface cooler is preferably used to realize the obvious cooling of the external air, which is beneficial to the air temperature after the wet membrane close to the external air dew point temperature, realizes the obvious heating of the spray water, which is beneficial to the improvement of the evaporation amount of the spray water on the second wet membrane, the improvement of the evaporation cooling capacity of the second wet membrane, and the water temperature of the second water collecting tank close to the dew point temperature. Because the air temperature through the second wet membrane is close to the dew point temperature, the air temperature through the first wet membrane and the spray water through the first wet membrane are also close to the dew point temperature, so that the spray water temperature entering the longitudinal finned tube heat exchanger is lower, the air temperature entering the longitudinal finned tube heat exchanger is lower, and the cooling capacity of the embodiment is improved as a whole.

[0111] Embodiment six:

[0112] Compared with other embodiments, the difference of the embodiment six is that the water collecting module is preferably a radial finned tube surface cooler, and the cooled fluid first flows into the radial finned tube surface cooler and then flows into the longitudinal finned tube heat exchanger.

[0113] By setting the water collecting module as the radial finned tube surface cooler, the residual heat in the air is fully utilized to cool the cooled fluid, the utilization rate of the air residual heat of the cooling tower is improved, and the cooling capacity of the closed cooling tower is improved.

[0114] The technical features of the above embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered that it is within the scope of the present application.

[0115] The above embodiments only express the preferred embodiments of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A longitudinal finned tube heat exchanger with built-in heat exchange sleeve and spray head, characterized in that: it comprises an array composed of several longitudinal finned tube heat exchange units, a heat exchanger frame, a flow divider, a spray water distributor, and a liquid collector; the longitudinal finned tube heat exchange unit is composed of an upper connecting assembly with integrated spray head, a longitudinal finned tube, a heat exchange tube, and a lower connecting piece; the upper part of the heat exchange tube is connected to the spray head of the upper connecting assembly through the internal pipeline of the upper connecting assembly, the lower part of the heat exchange tube is connected to the spray water distributor through the internal pipeline of the lower connecting piece, and the middle part of the heat exchange tube is arranged inside the longitudinal finned tube base tube of the longitudinal finned tube; the upper end of the upper connecting assembly is in communication with the flow divider, the lower end of the upper connecting assembly is in communication with the longitudinal finned tube base tube and the heat exchange tube respectively; the spray head of the upper connecting assembly is arranged in alignment with the longitudinal fin, and the spray head is in communication with the heat exchange tube through the internal pipeline of the upper connecting assembly; the lower connecting piece is arranged below the longitudinal finned tube base tube, the upper end of the lower connecting piece is in communication with the heat exchange tube and the finned tube base tube respectively, the liquid collector is in communication with the lower connecting piece and the finned tube base tube, and the spray water distributor is in communication with the lower connecting piece and the heat exchange tube.

2. The longitudinal finned tube heat exchanger with built-in heat exchange sleeve and spray head according to claim 1, characterized in that: the upper connecting assembly comprises an upper connecting flow guide, a T-shaped first inner sleeve, a spray head, and a spray limiting device; the spray head has a hollow structure with a wide upper part and a narrow lower part, the lower part of the upper connecting flow guide is embedded in the upper part of the spray head, the heat exchange tube is embedded in the lower part of the spray head, and the upper part of the finned tube base tube is connected to the lower part of the spray head by insertion; a plurality of concave grooves are arranged on the outer surface of the top of the spray head to serve as spray water spray channels; the first inner sleeve is composed of a horizontally distributed first branch unit, a horizontally distributed second branch unit, and a vertically distributed third branch unit, and the third branch unit is in communication with the first branch unit and the second branch unit; the upper end of the upper connecting flow guide is connected to the flow divider, and the lower part of the upper connecting flow guide is embedded in the first inner sleeve; the lower part of the upper connecting flow guide is wrapped by the upper part of the spray head and arranged above the internal support surface of the spray head; the spray limiting device is arranged around the upper connecting flow guide and the spray head, and wraps the first inner sleeve; the first branch unit and the second branch unit of the first inner sleeve are in communication with the interior of the spray limiting device.

3. The longitudinal finned tube heat exchanger with built-in heat exchange sleeve and spray head according to claim 1, characterized in that: 20-60 spray grooves are uniformly arranged on the top of the spray head, and the depth of the spray grooves is between 0.1mm and 0.2mm.

4. The longitudinal finned tube heat exchanger with built-in heat exchange sleeve and spray head according to claim 1, characterized in that: the spray water distributor is arranged above the liquid collector; the lower connecting piece comprises a lower connecting flow guide, a T-shaped second inner sleeve, and a lower connecting joint. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The upper part of the lower connecting flow director is connected with the lower part of the lower connecting joint, the middle part of the lower connecting flow director is nested with the second inner sleeve, and the lower part of the lower connecting flow director is connected with the liquid collector; The second inner sleeve is composed of a vertically distributed fourth branch unit, a transversely distributed fifth branch unit and a transversely distributed sixth branch unit, and the fourth branch unit is in communication with the fifth branch unit and the sixth branch unit; The lower connecting joint is composed of a lower connecting upper cylinder, a lower connecting lower cylinder and a support wall connecting the lower connecting upper cylinder and the lower connecting lower cylinder; the inside of the lower connecting upper cylinder is provided with the heat exchange pipe, the lower end of the heat exchange pipe is connected with the fourth branch unit in a plug-in manner, the outer wall of the lower connecting upper cylinder is connected with the longitudinal finned tube base pipe in a plug-in manner, and the lower connecting lower cylinder is connected with the upper part of the lower connecting flow director in a plug-in manner.

5. The longitudinal finned tube heat exchanger with built-in heat exchange sleeve and shower nozzle according to claim 4, wherein: Two adjacent longitudinal finned tube heat exchange units are connected with each other in a plug-in manner through the transversely distributed fifth branch unit and the sixth branch unit of the second inner sleeve of the corresponding lower connecting piece.

6. The longitudinal finned tube heat exchanger with built-in heat exchange sleeve and shower nozzle according to claim 1, wherein: The spray water distributor is arranged below the liquid collector; The lower connecting piece comprises a cross-shaped lower connecting flow director, a lower connecting joint and a spray water inlet joint; The upper part of the lower connecting flow director is connected with the lower part of the lower connecting joint, the left and right two branches of the middle part of the lower connecting flow director are respectively connected with the liquid collector or the left and right branches of the middle part of the lower connecting flow director of the adjacent longitudinal finned tube, and the lower part of the lower connecting flow director is connected with the upper end of the spray water inlet joint in a threaded manner, and the lower end of the spray water inlet joint is connected with the spray water distributor; The lower connecting joint is composed of a lower connecting upper cylinder, a lower connecting lower cylinder and a support wall connecting the lower connecting upper cylinder and the lower connecting lower cylinder; the inner wall of the lower connecting upper cylinder is used for inserting the heat exchange pipe into the spray water inlet joint, the inner diameter of the lower connecting upper cylinder is greater than the outer diameter of the heat exchange pipe; the outer wall of the lower connecting upper cylinder is used for inserting the longitudinal finned tube base pipe, the outer wall of the lower connecting upper cylinder is in a tight fit connection with the longitudinal finned tube base pipe; and the lower connecting lower cylinder is used for inserting the upper part of the lower connecting flow director.

7. The longitudinal finned tube heat exchanger with built-in heat exchange sleeve and shower nozzle according to claim 6, wherein: Two adjacent longitudinal finned tube heat exchange units are connected with each other in a plug-in manner through the transversely distributed left and right branches of the corresponding lower connecting flow director.

8. The longitudinal finned tube heat exchanger with built-in heat exchange sleeve and shower nozzle according to claim 1, wherein: An infrared radiation heat dissipation material is added to the hydrophilic coating on the outer surface of the longitudinal finned tube.

9. The longitudinal finned tube heat exchanger with built-in heat exchange sleeve and shower nozzle according to claim 1, wherein: The shunt or the spray water distributor or the liquid collector is composed of a liquid port, an M-stage hierarchical water distribution unit; an N-stage hierarchical water distribution unit is composed of an N-stage water distributor and a water distribution pipe; the N-stage water distributor is a two-way water distributor or a three-way water distributor or a four-way water distributor; the N-stage hierarchical water distribution unit divides the water in the upper-stage hierarchical water distribution unit into the water distribution pipe of the N-stage hierarchical water distribution unit through the N-stage water distributor; the N-1-stage hierarchical water distribution unit connects the N-stage water distributor of the N-stage hierarchical water distribution unit through the water distribution pipe of the N-1-stage hierarchical water distribution unit; the M-stage hierarchical water distribution unit connects the liquid connector corresponding to the finned tube heat exchange unit through the water distributor of the M-stage hierarchical water distribution unit, 1 < N ≤ M, N and M are natural numbers.

10. A closed cooling tower, characterized in that: The closed cooling tower comprises the built-in heat exchange finned tube of claim 1-9 and the longitudinal finned tube heat exchanger of the spray head, which is used for the countercurrent heat exchange and indirect evaporative heat exchange of the sprayed water on the cooled fluid during the operation of the cooling tower.

11. The closed cooling tower of claim 10, characterized in that: The closed cooling tower further comprises an air outlet, a fan, a water collection module, a first wet membrane, an air inlet, a first spray water pump, and a first water collection tank. The fan is arranged at the top of the closed cooling tower and sucks air from the air inlet into the first wet membrane, the longitudinal finned tube heat exchanger, the water collection module, and the air outlet in sequence. The fan, the water collection module, the longitudinal finned tube heat exchanger, and the first wet membrane are arranged in sequence along the air outlet direction.

12. The closed cooling tower of claim 11, characterized in that: The closed cooling tower further comprises a second wet membrane arranged on the windward side of the first wet membrane.

13. The closed cooling tower of claim 12, characterized in that: The closed cooling tower further comprises a second water collection tank. The second water collection tank comprises a second water supplement valve, a second automatic blowdown device, a partition, a filter screen, and a baffle for sedimentation and blowdown of the sprayed water.

14. The closed cooling tower of claim 13, characterized in that: The closed cooling tower further comprises an air precooling surface cooler. The air precooling surface cooler is arranged on the windward side of the second wet membrane.

15. The closed cooling tower of claim 11, characterized in that: The water collection module is a radial finned tube surface cooler.

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