A multi-stage cooling tower

Abstract

This application discloses a multi-stage cooling tower, belonging to the field of cooling tower technology. It mainly includes at least two sets of cooling towers in series or parallel configuration. In the series configuration, multiple cooling towers are stacked vertically, all with single-sided air intake. The upper cooling tower fan is located at the top of the platform, and the lower cooling tower fan is located on the side. All fans are in induced draft mode. In the parallel configuration, multiple cooling towers are placed side-by-side, with single-sided air intake. Multiple cooling towers share a water collection basin and a water distribution plate. The water distribution plate has evenly distributed water spray holes. Multiple branch pipes are led out from the main water supply pipe, with enlarged ends at the branch pipes. This multi-stage cooling tower, employing multiple sets of cooling towers in series and parallel configurations, addresses the problems of large required temperature drop and large water volume. The series configuration also solves the problems of large cooling tower footprint and the need for pumping between multiple stages. The parallel configuration solves the problem of uneven water distribution among the cooling towers, resulting in higher efficiency for the tower group.

Description

Technical Field

[0001] This application relates to the field of cooling tower technology, specifically a multi-stage cooling tower. Background Technology

[0002] When a cooling tower is in use, if the temperature difference between the inlet and outlet of the circulating water is large, a single tower cannot reduce the circulating water to the required temperature, or the cost of cooling in one step is too high. In this case, it is necessary to use a multi-stage cooling tower to cool the water, that is, to connect multiple cooling towers in series through pipelines to provide the required cold water in a stepped manner.

[0003] When the total volume of circulating water is large, the water treatment capacity of a single tower cannot meet the total water volume requirement. At this time, the circulating water that needs to be cooled is distributed to multiple towers, that is, multiple towers are connected in parallel. In this case, the multiple towers are arranged horizontally, and the circulating water is distributed to each tower through the main branch pipe.

[0004] These two methods are traditional series and parallel connection methods for cooling towers, which are widely used, but they also have many drawbacks.

[0005] The cooling towers are connected in series by pipes. Since the circulating water is sprayed and distributed in the cooling tower to dissipate heat and release pressure, the water falling into the water basin has no residual pressure. Therefore, the circulating water to the next tower needs to be pumped through the circulating water pump, which wastes energy.

[0006] Traditional parallel cooling towers typically consist of a single hot water header branching into multiple branches to each tower. Water returning from the cooling towers to the pool / basin is then collected into a single cold water header and supplied to the equipment. This often results in uneven water distribution, leading to inconsistent cooling tower efficiency and varying outlet water temperatures. The overall return water temperature is higher than the design value. Therefore, it is necessary to provide a multi-stage cooling tower to solve these problems.

[0007] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0008] Based on the aforementioned problems in the existing technology, the problem to be solved by this application is to provide a multi-stage cooling tower that solves the problems of large temperature drop and large water volume required for cooling towers.

[0009] The technical solution adopted by this application to solve its technical problem is: a multi-stage cooling tower, including an upper tower and a lower tower, wherein the upper tower is located above the lower tower;

[0010] Both the upper-level tower and the lower-level tower are single-sided air-inlet cooling towers;

[0011] The fan of the upper tower is located at the top of the platform, and the fan of the lower tower is located on the side. Both fans are in induced draft mode.

[0012] The upper-level tower cools high-temperature water, and the lower-level tower cools low-temperature water.

[0013] Furthermore, water distribution nozzles are installed at the lower part of the distribution plate of the upper tower.

[0014] Furthermore, the fan of the lower tower is located at the upper side.

[0015] Furthermore, the upper-stage tower packing is rectangular.

[0016] Furthermore, the lower-stage tower packing is stepped.

[0017] Furthermore, a water collector is provided at the front end of the air outlet of the lower tower.

[0018] A multi-stage cooling tower includes at least two sets of cooling towers, with multiple cooling towers placed side by side and all using a single-sided air intake mode. The multiple cooling towers share a water collection basin and a water distribution plate. The water distribution plate has evenly distributed water spray holes, and multiple branch pipes are led out from the main water supply pipe, with enlarged openings at the ends of the branch pipes.

[0019] The beneficial effects of this application are: The multi-stage cooling tower provided by this application adopts a novel series-parallel connection method for multiple cooling towers, which solves the problems of large required temperature drop and large water volume. The series connection method also solves the problems of large cooling tower footprint and the need for pumping between multiple towers. The parallel connection method also solves the problem of uneven water distribution in the cooling towers, making the tower group more efficient.

[0020] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. A further detailed description of this application will be provided below with reference to the figures. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0022] Figure 1 This is an overall schematic diagram of a multi-stage cooling tower connected in series according to this application;

[0023] Figure 2 This is an overall schematic diagram of a parallel connection method for a multi-stage cooling tower according to this application;

[0024] The following are the labeling elements in the figure:

[0025] 1. Upper tower; 2. Lower tower; 3. Cooling tower. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0028] Example 1

[0029] This embodiment mainly illustrates the series connection structure and principle of multiple cooling towers, specifically:

[0030] like Figure 1 As shown, taking a crossflow cooling tower as an example, the principle of a counterflow cooling tower is similar. Generally, multi-stage cooling towers are divided into two stages: an upper tower 1 and a lower tower 2. The upper tower 1 and the lower tower 2 are placed side by side. The lower tower 2 draws water from the water basin / pool of the upper tower 1 and pumps it to the lower tower 2 for cooling. Here, the series configuration is changed, and the upper tower 1 is located above the lower tower 2. Water is distributed to the water distribution basin packing of the lower tower 2 by gravity. The specific operation method is as follows:

[0031] To avoid the saturated humid air discharged from the lower tower 2 from affecting the upper tower, both the upper tower 1 and the lower tower 2 are single-sided air intake cooling towers.

[0032] The upper tower 1 fan is located at the top of the platform, and the lower tower 2 fan is located on the side. Both fans are in induced draft mode.

[0033] Upper tower 1 is located directly above lower tower 2;

[0034] Upper tower 1 cools high-temperature water, while lower tower 2 cools lower-temperature water.

[0035] Considering air distribution, water distribution, and cooling effect, the packing material of the upper tower 1 is rectangular, and the packing material of the lower tower 2 is stepped.

[0036] The packing material of the lower tower 2 is close to the air outlet, so a water collector is added at the front end of the air outlet;

[0037] Working principle: The upper tower 1 is located above the lower tower 2. The hot water returning to the tower is distributed to the packing through the water distributor and water spray basin of the upper tower 1. At the packing location, the hot water undergoes heat and mass exchange with the air. The hot air is discharged into the atmosphere through the air duct, and the cold water falls into the distribution plate in the lower part of the upper tower 1.

[0038] Water distribution nozzles are installed at the bottom of the distribution plate of the upper tower 1 to distribute the water cooled by the upper tower 1 to the packing of the lower tower 2, so that the water undergoes a second heat and mass exchange with the cold air at the packing of the lower tower 2, and the cooled water falls into the water collection plate for reuse.

[0039] Since the upper tower 1 and the lower tower 2 are connected in series and water is distributed by gravity, the delivery pump can be saved. In order to make the connection between the upper tower 1 and the lower tower 2 closer and to avoid the hot air of the lower tower 2 from affecting the cooling of the upper tower 1, the exhaust fan of the lower tower 2 is located on the side of the tower, and the corresponding position of the upper tower 1 is closed, with air entering from only one side.

[0040] The fan of the lower tower 2 is located on the upper side. Considering the uniformity of air distribution and cooling efficiency, the packing of the lower tower 2 is arranged in a stepped shape, and a water collector is arranged inside the packing to prevent excessive water drift.

[0041] Example 2:

[0042] This embodiment mainly illustrates the parallel connection structure and principle of multiple cooling towers, specifically:

[0043] like Figure 2 As shown, taking a crossflow cooling tower as an example, the principle of a counterflow cooling tower is similar. Generally, when the circulating water volume is large, multiple cooling towers 3 are needed to handle it together. In this case, multiple cooling towers 3 need to be connected in parallel, and the multiple cooling towers 3 connected in parallel are placed side by side. Here, the parallel connection method of the cooling towers 3 is changed, and the specific implementation is as follows:

[0044] Cooling towers are placed side by side;

[0045] Adopting a single-sided air intake mode;

[0046] Multiple cooling towers share a common water collection basin;

[0047] The water distributor is removed, and multiple cooling towers share a water distribution tray.

[0048] The water distribution tray has evenly distributed water holes to control the water spraying speed and maintain a certain liquid level in the water spraying basin.

[0049] Multiple branch pipes are drawn from the main water supply pipe, with enlarged ends at the ends of the branch pipes;

[0050] Working principle: The traditional parallel mode mainly has the problem of uneven water distribution, which is mainly because the traditional water distribution is a main pipe-branch pipe distribution mode;

[0051] This parallel cooling tower design abandons the parallel connection method of double-sided air intake and double-sided water distribution, and only uses one side for air intake and water distribution to solve the problem of uneven water volume in the two pipes;

[0052] The water distribution system eliminates the water distributor and replaces it with an enlarged opening at the end of the branch pipe, connecting all the water distribution basins. This allows the hot water falling into the basins to be distributed a second time through the water spray basins. During the second water distribution, because the liquid level in the water spray basins is consistent, the water volume in each cooling tower is consistent.

[0053] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A multi-stage evaporative cooling tower characterized by: include: An upper tower (1) and a lower tower (2), wherein the upper tower (1) is located above the lower tower (2); Both the upper tower (1) and the lower tower (2) are single-sided air-inlet cooling towers; The fan of the upper tower (1) is located at the top of the platform, and the fan of the lower tower (2) is located on the side. Both fans are in induced draft mode. The upper tower (1) cools high-temperature water, and the lower tower (2) cools low-temperature water.

2. A multi-stage cooling tower according to claim 1, wherein: The upper tower (1) is equipped with water distribution nozzles at the lower part of the distribution plate.

3. A multiple stage cooling tower according to claim 2, wherein: The fan of the lower tower (2) is located at the upper side.

4. A multiple stage cooling tower according to claim 3 wherein: The packing material of the upper tower (1) is rectangular.

5. A multiple stage cooling tower according to claim 4 wherein: The packing of the lower tower (2) is stepped.

6. A multiple stage cooling tower according to claim 5 wherein: A water collector is installed at the front end of the air outlet of the lower tower (2).

7. A multiple stage temperature reduction cooling tower characterized by: It includes at least two sets of cooling towers (3), multiple cooling towers (3) are placed side by side and all adopt a single-sided air intake mode. Multiple cooling towers (3) share a water collection basin and multiple cooling towers (3) share a water distribution plate. The water distribution plate has evenly distributed water spray holes. Multiple branch pipes are led out from the main water supply pipe and the ends of the branch pipes are enlarged.

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