A waste incinerator flue gas quenching and deacidification device

Abstract

This utility model relates to a rapid cooling and deacidification device, providing a rapid cooling and deacidification device for flue gas from a municipal solid waste incinerator. The device includes a base, a control cabinet, a water tank, metering pumps, and a drain pipe. The control cabinet is located on one side of the base, housing a data processing unit and a control module. A water tank is installed on the top right side of the base, and two metering pumps are located on the top of the base near the water tank. The input ends of both metering pumps are connected to the inside of the water tank, and the output ends of both pumps are connected to the drain pipe. This utility model achieves staged treatment of the gas flow by using a main cooling tank and a secondary cooling tank in cooperation. The secondary cooling tank pre-cools the gas flow, regulating the temperature of the gas entering the main treatment area to a preset temperature. The main cooling tank then performs deep cooling of the gas flow, completing the deacidification cooling process. This reduces the impact of gas temperature fluctuations on the overall treatment effect and significantly reduces the workload of the main cooling tank, improving the stability and efficiency of the system.

Description

Technical Field

[0001] This utility model relates to a rapid cooling and deacidification device, and more particularly to a rapid cooling and deacidification device for flue gas from a municipal solid waste incinerator. Background Technology

[0002] The flue gas produced by municipal solid waste incineration contains high concentrations of acidic gases (such as HCl and SOx). If emitted directly without effective treatment, it will severely pollute the atmosphere and corrode equipment. Therefore, rapid cooling and acid removal is an indispensable part of the flue gas purification process. Current technologies generally use spray towers to directly cool and remove acid from high-temperature flue gas, achieving rapid cooling and acid-base neutralization through alkaline spraying.

[0003] Due to fluctuations in incinerator operating conditions (such as changes in waste calorific value and uneven feed), flue gas temperature often exhibits irregular jumps. Traditional single-stage spray systems lack buffering mechanisms. For example, when the temperature suddenly rises, insufficient spray water volume leads to inadequate cooling and an increase in acidic gas residue. Conversely, a sudden drop in temperature can easily cause overcooling, wasting water resources and causing white smoke due to flue gas humidity saturation. This also exacerbates the risk of condensation and corrosion in pipelines, making it difficult to match dynamic temperature demands in real time. Ultimately, this results in unstable acid removal efficiency and shortened equipment lifespan. Especially when treating high-chlorine waste, temperature fluctuations may even trigger dioxin resynthesis, posing a serious challenge to subsequent environmental compliance emissions. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, the objective is to provide a device for rapid cooling and deacidification of flue gas from a municipal solid waste incinerator.

[0005] The technical solution of this utility model is: a rapid cooling and deacidification device for flue gas from a municipal solid waste incinerator, comprising a base, a control cabinet, a water tank, metering pumps, a drain pipe, a branch pipe, a main spray pipe, a branch spray pipe, a secondary cooling tank, a connecting pipe, an air inlet pipe, an integrated detection module, a main cooling tank, and an exhaust pipe. The control cabinet is located on one side of the base, housing a data processing unit and a control module. A water tank is installed on the top right side of the base. Two metering pumps are located on the top of the base near the water tank, with their input ends connected to the inside of the water tank and their output ends connected to drain pipes. A main cooling tank is vertically located on the top left side of the base, and a secondary cooling tank is vertically located on the top of the base near the main cooling tank. Both the main and secondary cooling tanks have cooling cavities inside. Airflow pipes are located at the bottom of both the main and secondary cooling tanks. An air inlet pipe is located on the airflow pipe of the secondary cooling tank. The pipeline is equipped with multiple integrated detection modules to detect the temperature, flow rate, and air pressure inside the inlet pipe. The integrated detection modules are connected to the data processing unit of the control cabinet. The top of the auxiliary cooling tank is equipped with a connecting pipe, the other end of which is connected to the airflow pipeline of the main cooling tank. The top of the main cooling tank is equipped with an exhaust pipe. The inlet pipe is used to introduce the gas that needs to be cooled and deacidified into the auxiliary cooling tank. The airflow after cooling and deacidification is transmitted into the external reactor through the exhaust pipe. Each of the two drain pipes is equipped with multiple branch pipes. The ends of the branch pipes on the two drain pipes extend into the main cooling tank and the auxiliary cooling tank, respectively. The branch pipes are connected to the main spray pipes. The multiple main spray pipes in the same tank are arranged vertically. Each main spray pipe is connected to multiple branch spray pipes in a radiating tree pattern. Each branch spray pipe is equipped with multiple atomizing nozzles. The metering pumps are all connected to the control module of the control cabinet.

[0006] Furthermore, it also includes a transmission pipe, a gas guide pipe, and an electrically controlled valve body. The transmission pipe is installed on the connecting pipe and is connected to the external reactor. The gas flow pipe of the main cooling tank is provided with a gas guide pipe at the end, and the end of the gas guide pipe extends into the inlet pipe. Electrically controlled valve bodies are installed on the rear section of the connecting pipe, the gas guide pipe, and the rear section of the inlet pipe along the air flow direction. The air flow in the inlet pipe is controlled to enter the main cooling tank or the auxiliary cooling tank by the alternating control of the two electrically controlled valve bodies on the gas guide pipe and the inlet pipe. The direction of the air flow inside and outside the auxiliary cooling tank is controlled by the electrically controlled valve body on the connecting pipe.

[0007] Furthermore, it also includes a dust collector. The air intake pipe is equipped with a dust collector, and the airflow will pass through the dust collector before entering the main cooling tank or the auxiliary cooling tank.

[0008] Furthermore, it also includes a booster pump, which is installed on the air intake pipe and is connected to the control module of the control cabinet.

[0009] Furthermore, it also includes an airflow distributor and a demister. Demisters are installed in the upper part of both the main cooling tank and the auxiliary cooling tank, and an airflow distributor is installed above each spray pipe in both the main cooling tank and the auxiliary cooling tank.

[0010] Furthermore, it also includes a return pipe and an overflow pipe. Both the main cooling tank and the auxiliary cooling tank have overflow ports at the bottom. The overall height of the overflow ports is lower than the height of the airflow pipes in the same tank. An overflow pipe is provided at each overflow port. Both the main cooling tank and the auxiliary cooling tank have return pipes at the bottom. The return pipes are used to connect to external liquid circulation components to extract the spray liquid collected in the lower part of the tank.

[0011] The beneficial effects are as follows: 1. By setting up a main cooling tank and a secondary cooling tank to cooperate with each other, this utility model realizes the staged treatment of the airflow. The secondary cooling tank is responsible for pre-cooling the airflow and regulating the temperature of the airflow entering the main treatment area to the preset temperature. Then, the main cooling tank completes the deep cooling of the airflow and completes the cooling work of deacidification. This reduces the impact of gas temperature fluctuations on the overall treatment effect and also significantly reduces the workload of the main cooling tank, improving the stability and efficiency of the system.

[0012] 2. By setting up auxiliary pipelines and electrically controlled valves, this utility model significantly improves the system's handling capability in emergency situations. When maintenance is required on a certain tank, the airflow direction can be flexibly adjusted through the electrically controlled valve to guide the airflow to a single tank for processing. This eliminates the need to rely on other tanks for cooperation or to stop the operation, thereby enhancing the system's reliability and flexibility and effectively ensuring the continuity of production.

[0013] 3. This utility model further optimizes the uniform distribution of airflow during transmission within the tank by adding an airflow distributor above each spray pipe of the main cooling tank and the auxiliary cooling tank, ensuring full contact between the airflow and the cooling medium, and significantly improving the cooling effect and deacidification efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the first three-dimensional structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the second three-dimensional structure of the present invention.

[0016] Figure 3 This is a three-dimensional structural diagram of the main cooling tank, auxiliary cooling tank, and dust collector of this utility model.

[0017] Figure 4 This is a three-dimensional structural diagram of the spray mechanism, airflow distributor, and demister of this utility model.

[0018] In the attached diagram, the following are the reference numerals: 1_base, 2_control cabinet, 3_water tank, 31_metering pump, 32_drain pipe, 321_diverter pipe, 33_main spray pipe, 34_branch spray pipe, 4_auxiliary cooling tank, 41_connecting pipe, 42_air inlet pipe, 43_integrated detection module, 44_transmission pipe, 5_main cooling tank, 51_exhaust pipe, 52_air guide pipe, 6_return pipe, 61_overflow pipe, 7_dust collector, 8_booster pump, 9_electrically controlled valve body, 10_airflow distributor, 11_demister. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0020] Example 1

[0021] A device for rapid cooling and deacidification of flue gas from a municipal solid waste incinerator, such as Figure 1-4 As shown, the system includes a base 1, a water tank 3, a metering pump 31, a drain pipe 32, a branch pipe 321, a main spray pipe 33, a branch spray pipe 34, a secondary cooling tank 4, a connecting pipe 41, an air inlet pipe 42, a main cooling tank 5, and an exhaust pipe 51. The water tank 3 is installed on the top right side of the base 1 as a storage container for coolant, providing a coolant source for the entire device. Alkaline substances can be added to the coolant for mixing, so as to neutralize the acidic substances in the flue gas and improve the deacidification efficiency of the subsequent spraying process. Two metering pumps 31 are installed on the top side of the base 1 near the water tank 3. The input end of each metering pump 31 is connected to the inside of the water tank 3, and the output end of each pump is connected to a drain pipe 32. By controlling the pump's pumping volume, the flow rate of the coolant can be precisely controlled, and the coolant is transported from the water tank 3 to the subsequent cooling system.

[0022] A main cooling tank 5 is vertically mounted on the top left side of the base 1, and a secondary cooling tank 4 is vertically mounted on the top side of the base 1 near the main cooling tank 5. Both the main cooling tank 5 and the secondary cooling tank 4 have cooling cavities inside, and each cooling cavity has multiple atomizing spray areas to efficiently cool and deacidify the high-temperature airflow entering the two tanks. Both the main cooling tank 5 and the secondary cooling tank 4 have airflow pipes at their lower parts. The airflow pipe of the secondary cooling tank 4 is equipped with an air inlet pipe 42, which is used to introduce the gas that needs to be cooled and deacidified into the secondary cooling tank 4. At the same time, multiple integrated detection modules 43 are installed on the air inlet pipe 42 to detect key parameters such as temperature, flow rate and airflow pressure in the air inlet pipe 42 in real time.

[0023] The top of the auxiliary cooling tank 4 is equipped with a connecting pipe 41, and the other end of the connecting pipe 41 is connected to the airflow pipe of the main cooling tank 5. The gas entering the cooling cavity of the auxiliary cooling tank 4 is transported from bottom to top and is initially cooled by the spray cooling components of the auxiliary cooling tank 4. The airflow enters the lower part of the main cooling tank 5 through the connecting pipe 41 for further deep cooling and deacidification treatment. The top of the main cooling tank 5 is equipped with an exhaust pipe 51. The cooled and deacidified airflow is transmitted into the external reactor through the exhaust pipe 51 to complete the entire cooling and deacidification process.

[0024] Each of the two drain pipes 32 is equipped with multiple branch pipes 321. The ends of the branch pipes 321 on the two drain pipes 32 extend into the main cooling tank 5 and the auxiliary cooling tank 4, respectively. The branch pipes 321 distribute the coolant evenly to multiple spray areas in each cooling tank. The branch pipes 321 are connected to the main spray pipes 33. The multiple main spray pipes 33 in the same tank are arranged vertically to improve the cooling uniformity. The main spray pipes 33 are connected to multiple branch spray pipes 34 in a radiating tree pattern. The branch spray pipes 34 are equipped with multiple atomizing nozzles. The coolant is sprayed into the airflow in the form of fine particles through the atomizing nozzles. The multiple main spray pipes 33 and the branch spray pipes 34 distributed on them form multiple vertically distributed cooling spray areas in the tank, which increases the contact area and time between the coolant and the airflow, and significantly improves the heat exchange efficiency and deacidification effect.

[0025] Different types of atomizing nozzles can be used in different spray areas to produce different droplet sizes, thus creating variations in droplet size across the spray areas. Specifically, nozzles that generate larger droplets can be used in the spray area near the bottom of the tank to enhance the cooling capacity in the initial stage; while nozzles that generate smaller droplets are used in the middle and upper areas to increase the residence time and contact area of ​​the droplets in the airflow, further improving heat exchange efficiency and the removal of acidic substances.

[0026] Among them, a control cabinet 2 is provided on one side of the base 1. The control cabinet 2 is equipped with a data processing unit and a control module, which is used to receive signals from the integrated detection module 43 and dynamically adjust the working state of the metering pump 31 through analysis and feedback, so as to accurately control the flow rate of coolant pumped by the two metering pumps 31 and ensure that the cooling effect reaches the best.

[0027] Specifically, the airflow requiring cooling first enters the auxiliary cooling tank 4 through the inlet pipe 42. Before entering this tank, the integrated detection module 43 monitors the airflow pressure and temperature in real time and feeds the detection data back to the data processing unit of the control cabinet 2. Based on the received detection data, the control cabinet 2 dynamically adjusts the pumping volume of the metering pump 31 to precisely control the liquid spray flow rate entering the auxiliary cooling tank 4. After passing through multiple spray zones in the auxiliary cooling tank 4, the airflow rapidly reduces its temperature to a preset value, achieving a pre-cooling effect. This also reduces gas temperature fluctuations and alleviates the processing pressure on the subsequent main cooling tank 5. Subsequently, the pre-cooled airflow enters the main cooling tank 5 through the connecting pipe 41, where it undergoes multi-stage spray cooling and deacidification treatment to further reduce its temperature and remove acidic substances. Finally, the cooled and deacidified airflow is discharged through the exhaust pipe 51 and introduced into the external reactor, completing the entire cooling and deacidification process.

[0028] Example 2

[0029] like Figure 1-3 As shown, the device also includes a transmission pipe 44, a gas guide pipe 52, and an electrically controlled valve body 9. The transmission pipe 44 is connected to the external reactor via the connecting pipe 41, allowing the cooled and deacidified gas flow to enter the external reactor. The gas flow pipe of the main cooling tank 5 has a gas guide pipe 52 at its end, extending into the inlet pipe 42. Electrically controlled valve bodies 9 are installed on the rear section of the connecting pipe 41, the gas guide pipe 52, and the rear section of the inlet pipe 42 along the gas flow direction. By alternately controlling the two electrically controlled valve bodies 9 on the gas guide pipe 52 and the inlet pipe 42, the gas flow in the inlet pipe 42 can be controlled to enter the main cooling tank 5 or the auxiliary cooling tank 4. The direction of the gas flow inside and outside the auxiliary cooling tank 4 can be controlled by the electrically controlled valve body 9 on the connecting pipe 41. This design allows for emergency operation by controlling the gas flow from a single tank to be introduced and drawn out without shutting down the system during the original process if maintenance is required in one tank.

[0030] Specifically, in the initial state, both the main cooling tank 5 and the auxiliary cooling tank 4 are in normal working condition: the electrically controlled valves 9 on the connecting pipe 41, the air guide pipe 52, and the downstream section of the air intake pipe 42 along the airflow direction are all in their initial settings. The airflow enters the auxiliary cooling tank 4 along the air intake pipe 42, and then normally enters the main cooling tank 5. When the auxiliary cooling tank 4 requires maintenance and the main cooling tank 5 needs to operate independently, the electrically controlled valves 9 on the connecting pipe 41 and the air intake pipe 42 are closed, disconnecting the auxiliary cooling tank 4 from the air intake pipe 42 and from the next process. Ensure that the airflow in the auxiliary cooling tank 4 no longer enters or exits, adjust and open the electronically controlled valve body 9 on the air inlet pipe 42 to ensure that the airflow only enters the main cooling tank 5 and does not divert to the auxiliary cooling tank 4, disconnect the working state of the metering pump 31 connected to the drain pipe 32 of the auxiliary cooling tank 4, and adjust the working state of the other metering pump accordingly to switch to the draining state of independent spraying of a single tank. The main cooling tank 5 undertakes the cooling and deacidification task alone. During the independent operation of the main cooling tank 5, maintenance operations such as cleaning and replacement of parts can be performed on the auxiliary cooling tank 4 without stopping the machine.

[0031] When the main cooling tank 5 requires maintenance and the auxiliary cooling tank 4 needs to operate independently, close the electrically controlled valve body 9 on the connecting pipe 41 and the air guide pipe 52 to disconnect the connection between the main cooling tank 5 and the airflow. Adjust and open the electrically controlled valve body 9 on the air inlet pipe 42 to ensure that the airflow only enters the auxiliary cooling tank 4 and does not divert to the main cooling tank 5. The auxiliary cooling tank 4 independently undertakes the task of cooling and deacidification. The airflow after cooling and deacidification is discharged through the transmission pipe 44 and enters the subsequent processing equipment or external reactor. During the independent operation of the auxiliary cooling tank 4, maintenance operations such as cleaning and replacement of parts can be performed on the main cooling tank 5 without stopping the machine. Through the combined use of the added pipes and the electrically controlled valve body 9, the independent operation status of the main cooling tank 5 and the auxiliary cooling tank 4 can be flexibly switched, improving the reliability of the device and its short-term emergency response capability.

[0032] Among them, such as Figure 1 and Figure 2 As shown, the device also includes a dust collector 7. The dust collector 7 is installed on the inlet pipe 42. Before the airflow enters the main cooling tank 5 or the auxiliary cooling tank 4, it will pass through the dust collector 7 to remove particulate matter carried in the airflow, ensuring the subsequent cooling and deacidification effect, thereby reducing the impact of particulate matter on the subsequent cooling and deacidification process, ensuring that the coolant and acidic substances in the airflow are in full contact, and improving the overall treatment effect.

[0033] like Figure 2 and Figure 3As shown, the device also includes a booster pump 8. The booster pump 8 is installed on the air intake pipe 42. The booster pump 8 is connected to the control module of the control cabinet 2. Before the airflow enters the main cooling tank 5 or the auxiliary cooling tank 4, the airflow pressure is detected by the integrated detection module 43. Based on the detection result, the booster pump 8 is controlled to adjust the airflow pressure in real time to reduce pressure fluctuations caused by external factors, thereby ensuring that the airflow enters the cooling tank in a stable state for subsequent processing.

[0034] like Figure 4 As shown, it also includes an airflow distributor 10 and a demister 11. Demisters 11 are provided in the upper part of both the main cooling tank 5 and the auxiliary cooling tank 4. Their main function is to remove residual droplets in the airflow after cooling and deacidification, and prevent the droplets from being discharged with the airflow, thereby avoiding the impact on subsequent equipment or the environment.

[0035] Meanwhile, in the main cooling tank 5 and the auxiliary cooling tank 4, an airflow distributor 10 is provided above each spray pipe 33 to evenly distribute the airflow in the tank, ensuring that the airflow can fully contact the coolant and further improve the cooling and deacidification efficiency.

[0036] In addition, such as Figure 1 , Figure 3 and Figure 4 As shown, it also includes a return pipe 6 and an overflow pipe 61. The main cooling tank 5 and the auxiliary cooling tank 4 are both equipped with return pipes 6 at the bottom. The return pipes 6 are used to connect to external liquid circulation components. Their function is to connect to external liquid circulation components to extract the spray liquid collected in the lower part of the tank and reuse it, thereby reducing the amount of liquid accumulated in the device, saving resources and maintaining the stable operation of the system. The main cooling tank 5 and the auxiliary cooling tank 4 are both equipped with overflow ports at the bottom of the tank body. The overall height of the overflow ports is lower than the height of the airflow pipes in the same tank body. The overflow ports are equipped with overflow pipes 61. The function of the overflow pipes 61 is to provide overflow protection when there is too much liquid in the tank, preventing the liquid from affecting the airflow or damaging the equipment.

[0037] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present application. Therefore, the content of this specification should not be construed as a limitation of the present application.

Claims

1. A device for rapid cooling and deacidification of flue gas from a municipal solid waste incinerator, comprising a base (1) and a control cabinet (2), wherein the control cabinet (2) is provided on one side of the base (1), and the control cabinet (2) is provided with a data processing unit and a control module; Its features are: The base (1) consists of a water tank (3), a metering pump (31), a drain pipe (32), a branch pipe (321), a main spray pipe (33), a branch spray pipe (34), a secondary cooling tank (4), a connecting pipe (41), an air inlet pipe (42), an integrated detection module (43), a main cooling tank (5), and an exhaust pipe (51). The water tank (3) is installed on the top right side of the base (1). Two metering pumps (31) are located on the top side of the base (1) near the water tank (3). The input ends of the metering pumps (31) are connected to the inside of the water tank (3). Each of the base (1) has a drain pipe (32) connected to its output end. The main cooling tank (5) is vertically mounted on the top left side of the base (1). The auxiliary cooling tank (4) is vertically mounted on the top side of the base (1) near the main cooling tank (5). Both the main cooling tank (5) and the auxiliary cooling tank (4) have cooling cavities inside. Both the main cooling tank (5) and the auxiliary cooling tank (4) have airflow pipes at their lower parts. The airflow pipe of the auxiliary cooling tank (4) has an air inlet pipe (42). The air inlet pipe (42) has multiple integrated detection modules (43) on its pipe for detecting the air inlet pipe (4). 2) The temperature, flow rate and air pressure inside are integrated. The detection module (43) is connected to the data processing unit of the control cabinet (2). The top of the auxiliary cooling tank (4) is provided with a connecting pipe (41). The other end of the connecting pipe (41) is connected to the air flow pipe of the main cooling tank (5). The top of the main cooling tank (5) is provided with an exhaust pipe (51). The air inlet pipe (42) is used to introduce the gas that needs to be cooled and deacidified into the auxiliary cooling tank (4). The air flow after cooling and deacidification is transmitted into the external reactor through the exhaust pipe (51). Both drain pipes (32) are equipped with Multiple branch pipes (321) are provided. The ends of the branch pipes (321) on the two drain pipes (32) extend into the main cooling tank (5) and the auxiliary cooling tank (4) respectively. The branch pipes (321) are connected to the main spray pipes (33). The multiple main spray pipes (33) in the same tank are arranged vertically. The main spray pipes (33) are connected to multiple spray branch pipes (34) in a radiating tree shape. The spray branch pipes (34) are equipped with multiple atomizing nozzles. The metering pumps (31) are all connected to the control module signal of the control cabinet (2).

2. The rapid cooling and deacidification device for flue gas from a municipal solid waste incinerator according to claim 1, characterized in that: It also includes a transmission pipe (44), a gas guide pipe (52), and an electric control valve body (9). The transmission pipe (44) is provided on the connecting pipe (41) and is connected to the external reactor. The gas flow pipe (52) of the main cooling tank (5) is provided at the end of the gas flow pipe and extends into the inlet pipe (42). Electric control valve bodies (9) are provided on the rear section of the connecting pipe (41), the gas guide pipe (52), and the rear section of the inlet pipe (42) along the gas flow direction. The gas flow in the inlet pipe (42) is controlled to enter the main cooling tank (5) or the auxiliary cooling tank (4) by the alternating control of the two electric control valve bodies (9) of the gas guide pipe (52) and the inlet pipe (42). The direction of the gas flow inside and outside the auxiliary cooling tank (4) is controlled by the electric control valve body (9) on the connecting pipe (41).

3. The rapid cooling and deacidification device for flue gas from a municipal solid waste incinerator according to claim 2, characterized in that: It also includes a dust collector (7). The air inlet pipe (42) is equipped with a dust collector (7). Before the airflow enters the main cooling tank (5) or the auxiliary cooling tank (4), it will pass through the dust collector (7).

4. The rapid cooling and deacidification device for flue gas from a municipal solid waste incinerator according to claim 3, characterized in that: It also includes a booster pump (8), which is installed on the air intake pipe (42) and is connected to the control module of the control cabinet (2) via signal.

5. The rapid cooling and deacidification device for flue gas from a municipal solid waste incinerator according to claim 4, characterized in that: It also includes an airflow distributor (10) and a demister (11). The upper part of the main cooling tank (5) and the auxiliary cooling tank (4) are equipped with demisters (11). Each spray pipe (33) in the main cooling tank (5) and the auxiliary cooling tank (4) is equipped with an airflow distributor (10).

6. The rapid cooling and deacidification device for flue gas from a municipal solid waste incinerator according to claim 5, characterized in that: It also includes a return pipe (6) and an overflow pipe (61). The main cooling tank (5) and the auxiliary cooling tank (4) both have overflow ports at the bottom. The overall height of the overflow ports is lower than the height of the airflow pipes in the same tank. An overflow pipe (61) is provided at each overflow port. The main cooling tank (5) and the auxiliary cooling tank (4) both have a return pipe (6) at the bottom. The return pipe (6) is used to connect to external liquid circulation components to extract the spray liquid collected in the lower part of the tank.

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