Dry-wet combined cooling tower

Abstract

The utility model provides a dry-wet combined cooling tower, which belongs to the technical field of cooling towers and comprises a tower body. The dry section heat exchange area is arranged on the upper section in the tower body; the wet-section heat exchange area is arranged at the lower section in the tower body and is in gas circulation with the dry-section heat exchange area; the circulating water system is connected with the heat exchanger group in the dry-section heat exchange area and the water distribution device in the wet-section heat exchange area through pipelines in a liquid way manner; wherein the heat exchanger group is vertically arranged in the dry section heat exchange area in a W shape and is adjacent to the first air inlets in the two side walls of the tower body. The utility model provides the heat exchanger group which is arranged in a W shape, so that the effective contact area between the heat exchanger and dry cold air can be greatly increased, the heat exchange efficiency of the dry section of the cooling tower is further obviously improved, meanwhile, the air mixing effect in the tower is better, and the fog dispersal and water saving effects are further improved; under the same heat exchange efficiency, compared with the traditional form of linear arrangement, the cooling tower is smaller in size and lower in overall cost.

Description

Technical Field

[0001] The utility model relates to the technical field of cooling towers, in particular to a dry-wet combined cooling tower. Background Art

[0002] A widely used cooling device today is the combined dry-wet cooling tower. This highly efficient cooling system combines dry cooling (air cooling) and wet cooling (water evaporation). This cooling tower is designed to overcome the limitations of a single cooling method, achieving a more optimal cooling effect by combining air flow and water evaporation.

[0003] The dry-section heat exchanger in a combined dry-wet cooling tower is a key component of the system, primarily used to transfer heat to the surrounding environment through air cooling, without involving direct evaporation of water. In the dry-section heat exchanger, a heat medium (typically hot water or other hot fluid discharged from the plant) enters the heat exchanger through pipes and exchanges heat with the outside air. The outside air is forced to circulate by the fan within the cooling tower, removing heat as it passes over the heat exchanger surface. This non-contact cooling method avoids direct evaporation losses of water, reduces water quality requirements, and also reduces water treatment costs.

[0004] The design of dry heat exchangers usually takes into account the optimization of air flow to ensure that the air can effectively contact the heat exchanger surface. Heat exchangers generally use a larger surface area to increase the efficiency of heat exchange. Figure 1 As shown, in the prior art, dry-side heat exchangers 11 are typically arranged vertically and linearly on the end walls of the cooling tower 10. However, this layout has several drawbacks: 1. The heat exchange area cannot be significantly increased, resulting in poor heat exchange performance in the dry section of the dry-wet combined cooling tower. 2. The dry hot air generated by the heat exchanger and then mixed with the moist hot air in the tower is inefficient, resulting in suboptimal demisting and water conservation. Summary of the Invention

[0005] The purpose of the utility model is to overcome the defects of the prior art and provide a dry-wet combined cooling tower, which solves the problems in the prior art of the linear layout of the heat exchanger in the dry section, resulting in a small heat exchange area, poor overall heat exchange effect, and unsatisfactory water-saving effect.

[0006] In order to achieve the above objectives and other objectives, the present invention is implemented by including the following technical solutions: the present invention proposes a dry-wet combined cooling tower, including a tower body; a dry-section heat exchange zone, arranged in the upper inner section of the tower body; a wet-section heat exchange zone, arranged in the lower inner section of the tower body, and communicating with the gas of the dry-section heat exchange zone; a circulating water system, connected to the heat exchanger group of the dry-section heat exchange zone and the water distribution device of the wet-section heat exchange zone through a pipeline; wherein the heat exchanger group is vertically arranged in a W shape in the dry-section heat exchange zone, and is arranged adjacent to the first air inlet on the two side walls of the tower body.

[0007] In one embodiment, the angle between two adjacent heat exchangers in the heat exchanger group can be set to 30° to 90°.

[0008] In one embodiment, second air inlets are further provided on both side walls of the tower body, and the second air inlets are provided on both side walls of the bottom of the tower body.

[0009] In one embodiment, a first louver and a second louver are respectively provided at the first air inlet and the second air inlet.

[0010] In one embodiment, the wet section heat exchange zone includes a water collector, a water distribution device and a packing layer arranged in sequence from top to bottom; the water collector is arranged at the junction of the dry section heat exchange zone and the wet section heat exchange zone; the water distribution device is respectively connected to the outlet pipe of the heat exchanger group and the wet section water inlet pipe of the circulating water system, and the water distribution device evenly sprays liquid onto the packing layer through the sprayer thereon.

[0011] In one embodiment, the packing layer is disposed above the second air inlet of the tower body.

[0012] In one embodiment, the circulating water system includes a dry section water inlet pipe, a wet section water inlet pipe, a bypass pipe and a water pool; the dry section water inlet pipe is connected to the water inlet pipe of the heat exchanger group; the wet section water inlet pipe is connected to the water distribution device; the water inlet end of the bypass pipe is connected to the water outlet pipe of the heat exchanger group, and the water outlet end is connected to the water pool; the water pool is arranged at the bottom of the tower body.

[0013] In one embodiment, during normal operation, the valve of the dry section water inlet pipe and the valve of the water distribution device are opened, and circulating hot water enters from the dry section water inlet pipe, flows into the heat exchange tubes of the heat exchanger group through the water inlet pipe of the heat exchanger group for air cooling, and the cooled hot water flows out from the water outlet pipe of the heat exchanger group, enters the water distribution device and is sprayed on the packing layer through the sprinkler thereon for heat exchange, and finally flows into the water pool.

[0014] In one embodiment, when the outlet water temperature of the dry-wet combined cooling tower is too low or the ambient temperature is below 0°C, the valve of the dry section water inlet pipe and the valve of the bypass pipe are opened, and circulating hot water enters from the dry section water inlet pipe, flows into the heat exchange tubes of the heat exchanger group through the water inlet pipe of the heat exchanger group for air cooling, and the cooled hot water flows out from the outlet pipe of the heat exchanger group and directly flows into the water pool through the bypass pipe.

[0015] In one embodiment, when the heat exchanger group is under maintenance and the dry-wet combined cooling tower needs to be operated, the valve of the wet section water inlet pipe and the valve of the water distribution device are opened, and circulating hot water enters from the wet section water inlet pipe, passes through the water distribution device and is sprayed on the packing layer through the sprinkler thereon for heat exchange, and finally flows into the water pool.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The heat exchanger group of the dry-wet combined cooling tower provided by the utility model has a W-shaped layout, which can greatly increase the effective contact area between the heat exchanger and the dry cold air, thereby significantly improving the heat exchange efficiency of the dry section of the cooling tower. Due to the better cooling effect of the dry section, the water-saving benefits of the entire system are also enhanced, which not only contributes to environmental protection, but also brings significant economic benefits.

[0018] 2. The heat exchanger group of the dry-wet combined cooling tower provided by the utility model is in a W-shaped layout, which makes the air mixing effect in the tower better, further improves the fog elimination and water saving effects, and has great environmental benefits;

[0019] 3. The dry-wet combined cooling tower provided by the utility model adopts a W-shaped heat exchanger group. Under the same heat exchange efficiency, the cooling tower size is smaller and the overall cost is lower than the traditional linear layout;

[0020] 4. The circulating water system design of the dry-wet combined cooling tower provided by the utility model enables the cooling tower to operate only the dry section when the outlet water temperature is too low or the ambient temperature is below 0°C; when the heat exchanger group is under maintenance, the wet section can still be operated, the application scenarios are more extensive, and the cooling effect and water-saving effect are significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It shows a schematic diagram of the arrangement of the dry section heat exchanger in the cooling tower in the prior art.

[0022] Figure 2 Shown is a structural schematic diagram of a dry-wet combined cooling tower of the present utility model.

[0023] Figure 3 Shown is a schematic diagram of the arrangement of the heat exchanger group in the present invention.

[0024] Figure 4 Shown is a schematic diagram of the three-dimensional structure of the heat exchanger group in the present utility model.

[0025] Figure 5 Shown is a gas flow schematic diagram of a dry-wet combined cooling tower of the present invention. DETAILED DESCRIPTION

[0026] Please refer to the attached drawings. The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0027] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by those skilled in the art. They are not intended to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modifications, changes in proportional relationships, or adjustments in size, without affecting the efficacy and objectives that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0028] In this utility model, the serial numbers assigned to components, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. The term "connected" as used in this utility model, unless otherwise specified, includes both direct and indirect connections. The terms "include," "comprising," or any other variations thereof are intended to encompass a non-exclusive inclusion, meaning that in addition to the listed elements, additional elements not expressly listed may also be included.

[0029] like Figure 2 and Figure 3 As shown, the present invention provides a dry-wet combined cooling tower 100, comprising a tower body 110, a dry heat exchange section 120, a wet heat exchange section 130, and a circulating water system 140. The tower body 110 mainly supports the equipment inside and outside the tower; the dry heat exchange section 120 is arranged in the upper section of the interior of the tower body 110; the wet heat exchange section 130 is arranged in the lower section of the interior of the tower body 110; the dry heat exchange section 120 and the wet heat exchange section 130 are in gas circulation, and the gas in the wet heat exchange section 130 flows upward into the dry heat exchange section 120. The main pipes and valves of the circulating water system 140 are located outside the tower body 110, and are connected to the heat exchanger group 121 of the dry heat exchange section 120 and the water distribution device 132 of the wet heat exchange section 130 through pipes.

[0030] Please combine Figure 3 and Figure 4The heat exchanger group 121 is arranged vertically in a W-shape in the dry section heat exchange area 120, adjacent to the first air inlet provided on the two side walls of the tower body 110. The W-shaped arrangement of the heat exchanger group 121 can form a certain angle between its heat exchange surface and the air inlet surface, thereby making the heat exchange area at the first air inlet much larger than that of the traditional linear arrangement (see Figure 1 ) of the heat exchanger group, thereby improving the heat exchange efficiency and heat exchange effect at the first air inlet.

[0031] Furthermore, considering that the W-shaped arrangement of heat exchanger group 121 increases the number of heat exchangers within the tower, the angle between two adjacent heat exchangers in heat exchanger group 121 can be set to 30° to 90° while ensuring optimal heat exchange performance. This significantly improves heat exchange performance while reducing the increase in heat exchanger installation and operating costs. When the angle between two adjacent heat exchangers is 60°, the heat exchange area of ​​heat exchanger group 121 is twice that of a linearly arranged heat exchanger group, doubling the overall heat exchange efficiency and significantly improving water conservation.

[0032] Please review Figure 2 A first air inlet and a second air inlet are provided on both side walls of the tower body 110. The first air inlet is provided on both side walls where the dry section heat exchange area 120 is located, and is used to introduce dry and cold air into the dry section heat exchange area 120; the second air inlet is provided on both side walls at the bottom of the tower body 110, and is used to introduce dry and cold air into the wet section heat exchange area 130. The shape and size of the first and second air inlets can be determined according to specific design requirements. Furthermore, in order to adjust the air intake volume of the first and second air inlets, a first louver 111 and a second louver 112 can be provided at the first and second air inlets, respectively.

[0033] A fan 113 is further provided on the top of the tower body 110 . Two fans 113 are provided to improve the convection of air in the dry section heat exchange area 120 .

[0034] The heat exchanger groups 121 are located on both sides of the dry section heat exchange area 120 , and the middle is an air chamber area where dry hot air and moist hot air are mixed.

[0035] The wet heat exchange section 130 comprises, from top to bottom, a water collector 131, a water distribution device 132, and a packing layer 133. The water collector 131 is located at the junction of the dry heat exchange section 120 and the wet heat exchange section 130, intercepting water mist to conserve water. The water distribution device 132 is connected to the outlet pipe of the heat exchanger assembly 121 and evenly sprays liquid onto the packing layer 133 through its sprinklers. The packing layer 133 is located above the second air inlet 112 and primarily functions to increase the contact area between gas and liquid, thereby improving cooling efficiency. Dry, cold air entering through the second air inlet 112 comes into contact with the hot liquid sprayed by the water distribution device 132 in the packing layer 133. Some of the hot water evaporates and converts to steam, removing a significant amount of heat. Meanwhile, the remaining heat enters the dry heat exchange section 120 through conduction and convection, further cooling it.

[0036] The circulating water system 140 includes a dry-end water inlet pipe 141, a wet-end water inlet pipe 142, a bypass pipe 143, and a water tank 144. The dry-end water inlet pipe 141 is connected to the water inlet pipe of the heat exchanger group 121; the wet-end water inlet pipe 142 is connected to the water distribution device 132; the water inlet end of the bypass pipe 143 is connected to the water outlet pipe of the heat exchanger group 121, and the water outlet end is connected to the water tank 144. The water tank 144 is located at the bottom of the tower body 110 and is used to receive water discharged from the packing layer 133 and the water discharged from the bypass pipe 143.

[0037] The circulating water system 140 includes three operating modes: a dry and wet section operating mode, a dry section operating mode only, and a wet section operating mode only. The dry and wet section operating mode is the primary operating mode. During operation, the valves of the dry section water inlet pipe 141 and the valves of the water distribution device 132 are opened. Circulating hot water enters the dry section water inlet pipe 141, flows through the water inlet pipe of the heat exchanger group 121, and flows into the heat exchange tubes of the heat exchanger group 121 for air cooling. The cooled hot water then flows out of the water outlet pipe of the heat exchanger group 121, enters the water distribution device 132, and is sprayed on the packing layer 133 by the sprinklers thereon for heat exchange, before finally flowing into the water pool 144.

[0038] The dry-end-only operation condition is generally used when the cooling tower outlet water temperature is too low or the ambient temperature is below 0°C to prevent ice and freezing. During operation, the valve of the dry-end water inlet pipe 141 and the valve of the bypass pipe 143 are opened. Circulating hot water enters the dry-end water inlet pipe 141, flows through the water inlet pipe of the heat exchanger group 121, and flows into the heat exchange tubes of the heat exchanger group 121 for air cooling. The cooled hot water flows out of the water outlet pipe of the heat exchanger group 121 and directly into the water tank 144 through the bypass pipe 143.

[0039] The wet-segment-only operating condition is primarily used to ensure the normal operation of the combined dry-wet cooling tower 100 during maintenance of the heat exchanger assembly 121. During operation, the valves of the wet-segment water inlet pipe 142 and the water distribution device 132 are opened. Circulating hot water enters the wet-segment water inlet pipe 142, passes through the water distribution device 132, and is sprayed by the sprinklers thereon onto the packing layer 133 for heat exchange, before finally flowing into the water pool 144.

[0040] like Figure 5 As shown, the working principle of the dry-wet combined cooling tower 100 is as follows: dry cold air (thick solid arrow) passes through the first louver 111 to cool the hot water in the heat exchanger group 121 and turns into dry hot air (thin solid arrow); the cooled hot water flows out from the outlet pipe of the heat exchanger group 121, enters the water distribution device 132 and is sprayed onto the packing layer 133 through the sprinkler, and the external dry cold air enters the bottom of the tower body 110 through the second louver 112, exchanges heat with the sprayed hot water, and turns into saturated humid hot air (dashed arrow); the saturated humid hot air is mixed with the dry hot air in the air chamber area, turns into unsaturated air (double solid arrow), and is discharged from the tower body 110 from the fan 113.

[0041] In summary, the air exchanges heat with the sprayed hot water for evaporation, resulting in water loss; therefore, the greater the temperature drop in the dry heat exchange zone 120, the higher the water-saving effect of the dry-wet combined cooling tower 100. The heat exchanger group 121 of this design adopts a highly efficient W-shaped layout, which not only increases the heat exchange contact area between the dry cold air and the heat exchanger group 121, but also allows the dry cold air from the environment to enter the tower along the layout direction of the heat exchanger group 121 and mix with the hot and humid air in the tower. Since the air enters in a W-shaped manner, it has a turbulent effect, which improves the mixing effect of the dry hot air and the hot and humid air, further improving the demisting and water-saving effects, and has great environmental benefits.

[0042] Therefore, the present invention effectively overcomes the shortcomings of the prior art and possesses high industrial value. The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by persons skilled in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A dry and wet combined cooling tower, characterized in that: include tower body; The dry section heat exchange zone is arranged in the upper inner section of the tower body; The wet section heat exchange zone is arranged in the lower section of the tower body and is in gas communication with the dry section heat exchange zone; A circulating water system is connected to the heat exchanger group of the dry section heat exchange zone and the water distribution device of the wet section heat exchange zone through a pipeline; The heat exchanger group is vertically arranged in a W shape in the dry section heat exchange area and is disposed adjacent to the first air inlet on both side walls of the tower body.

2. The dry-wet combined cooling tower according to claim 1, characterized in that: The angle between two adjacent heat exchangers in the heat exchanger group can be set to 30° to 90°.

3. The dry-wet combined cooling tower according to claim 1, characterized in that: The two side walls of the tower body are further provided with second air inlets, and the second air inlets are arranged on the two side walls of the bottom of the tower body.

4. The dry-wet combined cooling tower according to claim 3, characterized in that: A first louver and a second louver are respectively provided at the first air inlet and the second air inlet.

5. The dry-wet combined cooling tower according to claim 1, characterized in that: The wet section heat exchange area includes a water collector, a water distribution device and a packing layer arranged in sequence from top to bottom; the water collector is arranged at the junction of the dry section heat exchange area and the wet section heat exchange area; the water distribution device is respectively connected to the outlet pipe of the heat exchanger group and the wet section water inlet pipe of the circulating water system, and the water distribution device evenly sprays liquid onto the packing layer through the sprayer thereon.

6. The dry-wet combined cooling tower according to claim 5, characterized in that: The packing layer is arranged above the second air inlet of the tower body.

7. The dry-wet combined cooling tower according to claim 6, characterized in that: The circulating water system includes a dry section water inlet pipe, a wet section water inlet pipe, a bypass pipe and a water pool; the dry section water inlet pipe is connected to the water inlet pipe of the heat exchanger group; the wet section water inlet pipe is connected to the water distribution device; the water inlet end of the bypass pipe is connected to the water outlet pipe of the heat exchanger group, and the water outlet end is connected to the water pool; the water pool is arranged at the bottom of the tower body.

8. The dry-wet combined cooling tower according to claim 7, characterized in that: During normal operation, the valve of the dry section water inlet pipe and the valve of the water distribution device are opened, and circulating hot water enters from the dry section water inlet pipe, flows into the heat exchange tube of the heat exchanger group through the water inlet pipe of the heat exchanger group for air cooling, and the cooled hot water flows out from the water outlet pipe of the heat exchanger group, enters the water distribution device and is sprayed on the packing layer through the sprinkler thereon for heat exchange, and finally flows into the water pool.

9. The dry-wet combined cooling tower according to claim 7, characterized in that: When the outlet water temperature of the dry-wet combined cooling tower is too low or the ambient temperature is lower than 0°C, the valve of the dry section water inlet pipe and the valve of the bypass pipe are opened, and circulating hot water enters from the dry section water inlet pipe, flows into the heat exchange tubes of the heat exchanger group through the water inlet pipe of the heat exchanger group for air cooling, and the cooled hot water flows out from the outlet pipe of the heat exchanger group and directly flows into the water pool through the bypass pipe.

10. The dry-wet combined cooling tower according to claim 7, characterized in that: When the heat exchanger group is under maintenance and the dry-wet combined cooling tower needs to be operated, the valve of the wet section water inlet pipe and the valve of the water distribution device are opened, and circulating hot water enters from the wet section water inlet pipe, passes through the water distribution device and is sprayed on the packing layer through the sprinkler thereon for heat exchange, and finally flows into the water pool.

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