Replaceable flush system for thermoelectric air-cooled islands

Abstract

The utility model provides a kind of replaceable flushing system for thermal power air cooling island, belong to thermal power plant energy saving technical field, comprising: softened water unit, desalted water unit, flushing and collection unit and air cooling unit;Desalted water unit includes the ultrafiltration device, reverse osmosis device and desalted water tank connected in turn in desalted water workshop;Softened water unit includes the double medium filter, sodium ion exchanger, softened water tank, constant pressure pump and water replenishing tank connected in turn;Air cooling unit includes air cooler and cooling fin;Flushing and collection unit includes high-pressure pump, flushing pipe, drain tank and water collecting pool connected by pipeline;Desalted water tank and water replenishing tank are connected with high-pressure pump inlet respectively by pipeline.The system uses diversified replaceable flushing water source to flush air cooler cooling fin, effectively reduces ash and deposit on it, improves the sustainability, mobility, reliability of air cooling island flushing system, improves the heat exchange efficiency and long-term stable operation safety of air cooling island.

Description

Technical Field

[0001] This utility model relates to the field of energy-saving technology in thermal power plants, and in particular to a replaceable flushing system for a thermoelectric air-cooled island. Background Technology

[0002] In cogeneration, air-cooled islands are a crucial component of the unit, widely adopted due to their significant water-saving advantages. They cool steam using air, avoiding the large water requirements of traditional wet cooling towers and requiring less floor space. However, since air-cooled islands ultimately release heat to the air during production, the heat dissipation equipment (such as heat exchanger tube bundles and fins) is directly exposed to the atmosphere. Therefore, air-cooled islands are highly susceptible to environmental conditions, especially in summer. Excessive ambient temperature often leads to overheating of the unit, limiting load increases. Load limitations not only reduce power plant revenue but also expose the plant to grid performance assessments. Furthermore, fly ash and dust in the air easily accumulate on the outer walls of the heat dissipation equipment, increasing thermal resistance and reducing heat exchange capacity. This, in turn, leads to decreased vacuum, increased back pressure, hindered unit output, and impaired power generation efficiency. In existing technologies, when the external ambient temperature is high (usually from April to October, depending on the climate of the production site), the heat dissipation equipment in the air-cooled island is often rinsed to remove the dirt and dust deposited on the outside of the equipment, reduce its heat load and back pressure, and improve its heat exchange efficiency and operating efficiency.

[0003] In thermal power generation, the cleanliness of the air-cooled island heat dissipation equipment directly affects the vacuum level of the air-cooled unit. Therefore, flushing the air-cooled island is a crucial step in ensuring the efficient operation of the system. Currently, the common method is to use high-pressure water to flush the air-cooled island heat dissipation equipment. The high-pressure water used for flushing the air-cooled island mainly uses demineralized water, but this method has the following problems: 1. High cost: The preparation and use of demineralized water are costly, increasing overall production costs and also increasing the wear and maintenance costs of the demineralized water production equipment; 2. Resource waste: Flushing the air-cooled island with demineralized water increases the consumption of demineralized water, leading to a waste of high-quality water resources. It is evident that existing flushing methods and systems lack effective cost control and resource optimization measures. Utility Model Content

[0004] This invention provides an alternative flushing system for thermoelectric air-cooled islands, which solves the problems of existing air-cooled island flushing systems using demineralized water, such as large consumption volume, high preparation and usage costs, water waste, and increased wear and maintenance costs of demineralized water production equipment.

[0005] This utility model provides a replaceable flushing system for a thermoelectric air-cooled island, comprising: a softened water unit, a demineralized water unit, a flushing and collection unit, and an air-cooling unit; the demineralized water unit includes an ultrafiltration device, a reverse osmosis device, and a demineralized water tank connected in sequence in the demineralized water workshop; the softened water unit includes a dual-media filter, a sodium ion exchanger, a softened water tank, a constant pressure pump, and a makeup water tank connected in sequence; the air-cooling unit includes at least one air cooler and at least one set of heat sinks; the flushing and collection unit includes a high-pressure pump connected by pipes, flushing pipes corresponding to the heat sinks on each air cooler, and drainage troughs and collection pools corresponding to each air cooler; the demineralized water tank and the makeup water tank are respectively connected to the inlet of the high-pressure pump by pipes; the outlet of the reverse osmosis device is also connected to the inlet of the makeup water tank by pipes; the outlet of the ultrafiltration device is also connected to the inlet of the dual-media filter.

[0006] Preferably, the flushing pipe is provided with a spray nozzle, a shower nozzle, or an atomizing nozzle on the side facing the heat sink.

[0007] Preferably, the softened water tank is equipped with a first level gauge, which is a magnetic float level gauge; a first regulating valve is provided on the pipeline between the constant pressure pump and the water replenishment tank; the first regulating valve, the first level gauge and the constant pressure pump are interlocked through a first control device.

[0008] Preferably, the water supply tank is equipped with a second level gauge, and the pipeline between the water supply tank and the high-pressure pump is equipped with a second regulating valve; the pipeline between the demineralized water tank and the high-pressure pump is equipped with a third regulating valve; the second level gauge, the second regulating valve and the third regulating valve are interlocked by the first control device.

[0009] Preferably, a fourth regulating valve is provided on the pipeline between the reverse osmosis unit and the water supply tank; the fourth regulating valve is interlocked with the second level gauge, the second regulating valve and the third regulating valve through the first control device.

[0010] Preferably, the water collection tank is connected to a wastewater tank via a booster pump.

[0011] Preferably, a filter is installed between the water collection tank and the booster pump.

[0012] Preferably, a third level gauge is installed in the water collection tank, and the third level gauge is interlocked with the booster pump through a second control device.

[0013] The replaceable flushing system for air-cooled islands in thermoelectric power plants provided by this utility model uses two processes—demineralized water flushing and softened water flushing—to perform replaceable flushing of the air-cooled island. The two flushing processes can be operated independently or interchangeably. By using softened water instead of demineralized water for flushing the air-cooled island, the amount of demineralized water used is saved, significantly reducing flushing costs, lowering the cost of demineralized water preparation and use, and extending the service life of ultrafiltration and reverse osmosis membranes, thus reducing their maintenance costs.

[0014] This system uses diverse and replaceable flushing water sources to rinse the heat sinks of air coolers, effectively reducing dust and deposits. This improves the continuity, mobility, and reliability of the air-cooled island flushing system, ensuring the cleanliness of the heat sinks, reducing energy consumption of the cooling system, and thus enhancing the heat exchange efficiency and long-term stable operation safety of the air-cooled island. It addresses the problems of existing air-cooled island flushing systems that use demineralized water, resulting in high consumption volumes, high preparation and usage costs, water waste, and increased wear and maintenance costs for demineralized water production equipment.

[0015] This system uses multi-component interlocking control of pumps, regulating valves, and level gauges in different locations to automatically switch the rinsing process, ensuring the continuity of air-cooled island rinsing. It can also replace manual labor, improving work efficiency, enhancing cleaning quality, reducing labor intensity, ensuring the automation and stability of the entire system, and improving the overall performance of the system. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the replaceable flushing system for a thermoelectric air-cooled island provided in one embodiment of the present invention;

[0018] Figure 2 A schematic diagram of the interlocking relationship of the first control device provided in one embodiment of this utility model;

[0019] Figure 3 This is a schematic diagram of the rinsing and collecting unit provided in one embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures:

[0021] 11-Ultrafiltration unit, 12-Reverse osmosis unit, 13-Demineralized water tank, 21-Dual media filter, 22-Sodium ion exchanger, 23-Softened water tank, 24-Constant pressure pump, 25-Make-up water tank, 31-Air cooler, 32-Heat sink, 41-High pressure pump, 42-Flushing pipe, 43-Drainage trough, 44-Collection tank, 45-Lift pump, 46-Wastewater tank, 47-Filter, 101-First level gauge, 102-First regulating valve, 103-First control device, 104-Second level gauge, 105-Second regulating valve, 106-Third regulating valve, 107-Fourth regulating valve, 201-Third level gauge, 202-Second control device. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are also within the protection scope of this utility model.

[0023] like Figure 1 This utility model provides a replaceable flushing system for a thermoelectric air-cooled island, comprising: a softened water unit, a demineralized water unit, a flushing and collection unit, and an air-cooling unit; the demineralized water unit includes an ultrafiltration device 11, a reverse osmosis device 12, and a demineralized water tank 13 connected in sequence in the demineralized water workshop; the softened water unit includes a dual-media filter 21, a sodium ion exchanger 22, a softened water tank 23, a constant pressure pump 24, and a makeup water tank 25 connected in sequence; the air-cooling unit includes at least one air cooler 31 and at least one set of heat sinks 32; the flushing and collection unit includes a high-pressure pump 41 connected by pipes, flushing pipes 42 corresponding to the heat sinks 32 on each air cooler 31, a drainage trough 43 and a collection pool 44 corresponding to each air cooler 31; the demineralized water tank 13 and the makeup water tank 25 are respectively connected to the inlet of the high-pressure pump 41 by pipes; the outlet of the reverse osmosis device 12 is also connected to the inlet of the makeup water tank 25 by pipes; the outlet of the ultrafiltration device 11 is also connected to the inlet of the dual-media filter 21.

[0024] This utility model's replaceable flushing system employs two processes—demineralized water flushing and softened water flushing—for the air-cooled island, allowing for interchangeable flushing. These two processes can operate independently or interchangeably. By using softened water instead of demineralized water for flushing, the amount of demineralized water used is reduced, significantly lowering flushing costs. This addresses the problems of existing air-cooled island flushing systems that rely on demineralized water, resulting in high consumption, high preparation and usage costs, water waste, and increased wear and maintenance costs for demineralized water production equipment. The system uses diverse and replaceable flushing water sources to clean the air cooler 31 and heat sink 32, effectively reducing dust and deposits. This improves the continuity, mobility, and reliability of the air-cooled island flushing system, ensuring the cleanliness of the air cooler 31 and heat sink 32, reducing energy consumption of the cooling system, and thus enhancing the heat exchange efficiency and long-term stable operation safety of the air-cooled island.

[0025] The demineralized water produced continuously and uninterruptedly by the multi-stage ultrafiltration unit 11 and reverse osmosis unit 12 in the demineralized water workshop is stored in the demineralized water tank 13. This demineralized water is used not only for air-cooled island flushing but also for other water-using units in the thermal power plant. Therefore, the demineralized water tank 13 is always kept at a high level and readily available. Simultaneously, the permeate from the reverse osmosis unit 12 can be sent to the makeup water tank 25 as supplementary water. When the demineralized water tank 13 is under heavy load, the reverse osmosis permeate from the makeup water tank 25 can also be directly used for air-cooled island flushing, providing diversification of flushing water and improving the operational flexibility of the flushing system.

[0026] The softening water unit adsorbs calcium and magnesium ions from ultrafiltration wastewater onto the resin through a dual-media filter 21 and a sodium ion exchanger 22 to obtain softened water. According to DL / T2657-2023, the softened water produced by ultrafiltration wastewater in enterprise production meets the relevant requirements for heating network makeup water. Therefore, using softened water to replace demineralized water for flushing the air-cooled island can also ensure that the flushing effect reaches the level of demineralized water, greatly saving the amount of demineralized water used, reducing its preparation and use costs, and extending the service life of ultrafiltration membranes and reverse osmosis membranes, thus reducing their maintenance costs.

[0027] In the rinsing and collection unit, a high-pressure pump 41 is used to send the rinsing water from the demineralized water tank 13 and the makeup water tank 25 into the rinsing pipe 42. The air cooler 31 is usually arranged in multiple parallel connections, and the rinsing pipe 42 is also arranged in parallel accordingly. The rinsing pipe 42 is arranged corresponding to the heat sink 32 on the air cooler 31 (preferably in parallel), so that it can be directly rinsed. The rinsing wastewater falls directly into the drainage trough 43 below the air cooler 31 and is finally collected in the collection tank 44 to prevent wastewater from being discharged and causing pollution to the production site, thereby improving the working environment.

[0028] In a specific implementation, the flushing pipe 42 is equipped with a spray nozzle, a shower nozzle, or a misting nozzle on the side facing the heat sink 32. The nozzles on the flushing pipe 42 cover a larger flushing area. Under the action of the high-pressure pump 41, the flushing water is sprayed at high speed through the spray nozzle, shower nozzle, or misting nozzle to flush the heat sink 32, ensuring the normal and safe operation of the air cooler 31 under high load and extremely high ambient temperatures in summer, and improving the reliability of the air-cooled island's operation in summer.

[0029] like Figure 2In a specific implementation scheme, the softened water tank 23 is equipped with a first level gauge 101, which is a magnetic float level gauge; a first regulating valve 102 is installed on the pipeline between the constant pressure pump 24 and the water supply tank 25; the first regulating valve 102, the first level gauge 101, and the constant pressure pump 24 are interlocked through a first control device 103. The head and output of the constant pressure pump 24, high pressure pump 41, etc. in this system meet the system requirements. Through the level interlock control, when the water level in the softened water tank 23 is low (e.g., below 0.3 meters), the constant pressure pump 24 automatically stops, and the first regulating valve 102 automatically closes, ensuring the safe operation of the softened water unit and improving the automation level of the system.

[0030] In a specific implementation plan, a second level gauge 104 is provided in the water replenishment tank 25, and a second regulating valve 105 is provided on the pipeline between the water replenishment tank 25 and the high-pressure pump 41; a third regulating valve 106 is provided on the pipeline between the demineralized water tank 13 and the high-pressure pump 41; the second level gauge 104, the second regulating valve 105 and the third regulating valve 106 are interlocked by the first control device 103.

[0031] In a specific implementation plan, a fourth regulating valve 107 is provided on the pipeline between the reverse osmosis unit 12 and the water supply tank 25; the fourth regulating valve 107 is interlocked with the second level gauge 104, the second regulating valve 105 and the third regulating valve 106 through the first control device 103.

[0032] When the demineralized water tank 13 is under heavy load or to conserve demineralized water, and the flushing water is to be replaced with softened water, the first control device 103 closes the third regulating valve 106 and opens the first regulating valve 102, the second regulating valve 105, and the constant pressure pump 24, using softened water from the makeup water tank 25 for flushing. Reverse osmosis permeate is used for makeup water; therefore, the fourth regulating valve 107 is normally closed during normal flushing. When the level in the softened water tank 23 is low, the constant pressure pump 24 and the first regulating valve 102 automatically close, and the fourth regulating valve 107 opens to replenish water to the makeup water tank 25, maintaining continuous flushing. When the level in the makeup water tank 25 is low, the third regulating valve 106 opens and the second regulating valve 105 closes, switching the flushing water to demineralized water to ensure continuous flushing of the air-cooled island. Through the interlocking control of the first control device 103, the system can automatically switch the flushing process, replacing manual operation, improving work efficiency, enhancing cleaning quality, and reducing labor intensity.

[0033] like Figure 3 In the specific implementation plan, the water collection tank 44 is connected to the wastewater tank 46 via a booster pump 45.

[0034] In a specific implementation, a filter 47 is installed between the water collection tank 44 and the booster pump 45. The flushing water carrying impurities from the heat sink 32 is collected in the water collection tank 44. At the same time, the water collection tank 44 can also collect rainwater from the air-cooled island platform. When the water collection tank 44 reaches a higher liquid level between the upper limit of its capacity, the water collected therein is filtered through the filter 47 to remove larger impurities, and then discharged into the wastewater tank 46 by the booster pump 45.

[0035] In a specific implementation plan, a third level gauge 201 is installed in the water collection tank 44. The third level gauge 201 is interlocked with the lift pump 45 through a second control device 202. The third level gauge 201 interlocks with the lift pump 45, and the lift pump 45 can be started through the second control device 202 to discharge the water in the water collection tank 44 into the wastewater tank 46 in a timely manner. This facilitates filtration, purification, desalination, and other treatments for reuse, thereby achieving recycling and saving water resources.

[0036] It should be noted that arrows without annotations indicate the direction of material flow.

[0037] The present invention will be further described in detail below with reference to specific embodiments.

[0038] Example 1

[0039] The replaceable flushing system for the thermal power air-cooled island operates as follows: During operation, the demineralized water produced continuously and uninterruptedly by the demineralized water workshop through the multi-stage ultrafiltration device 11 and the reverse osmosis device 12 is stored in the demineralized water tank 13. When demineralized water flushing is required, the third regulating valve 106 is opened by the first control device 103, and the high-pressure pump 41 sends the flushing demineralized water from the demineralized water tank 13 into the flushing pipe 42. The flushing pipe 42 is set to correspond to the heat sink 32 on the air cooler 31, allowing direct flushing. The flushed wastewater falls directly into the drainage trough 43 below the air cooler 31 and is eventually collected in the collection tank 44. When the collection tank 44 reaches a higher liquid level between the upper limit of its capacity, the lift pump 45 is activated by the second control device 202 to filter out larger impurities from the water in the collection tank 44 and discharge it into the wastewater tank 46 in a timely manner for subsequent purification and reuse.

[0040] The softening water unit adsorbs calcium and magnesium ions from the ultrafiltration wastewater onto the resin through a dual-media filter 21 and a sodium ion exchanger 22, producing softened water which is stored in the softened water tank 23. When the demineralized water tank 13 is under heavy load or to conserve demineralized water, and the flushing water is to be replaced with softened water, the first control device 103 closes the third regulating valve 106 and opens the first regulating valve 102, the second regulating valve 105, and the constant pressure pump 24, using softened water from the makeup water tank 25 for flushing. When the level in the softened water tank 23 is low, the constant pressure pump 24 and the first regulating valve 102 automatically close, and the fourth regulating valve 107 opens to replenish water to the makeup water tank 25, maintaining continuous flushing. When the level in the makeup water tank 25 is low, the third regulating valve 106 opens and the second regulating valve 105 closes, switching the flushing water to demineralized water to ensure continuous flushing of the air-cooled island.

[0041] Example 2

[0042] In this embodiment, taking the actual operating conditions of a thermal power plant as an example, when demineralized water flushing is required, the third regulating valve 106 is opened by the first control device 103, and the high-pressure pump 41 sends the flushing demineralized water from the demineralized water tank 13 into the flushing pipe 42. The flushing pipe 42 is set corresponding to the heat sink 32 on the air cooler 31, and can be directly flushed. The flushing wastewater falls directly into the drainage trough 43 below the air cooler 31, and is finally collected in the collection tank 44. The pipes in this flushing system are uniformly set as φ76mm×4mm stainless steel pipes to ensure the compatibility and stability of the system.

[0043] The demineralized water workshop has at least three sets of ultrafiltration units 11 and reverse osmosis units 12 connected in parallel. The water source for the softening water unit is the ultrafiltration wastewater (outlet water hardness ≤ 5 mmol / L) from ultrafiltration unit 11 (3#). Calcium and magnesium ions in the ultrafiltration wastewater are adsorbed onto the resin through a dual-media filter 21 and a sodium ion exchanger 22 to obtain softened water (hardness ≤ 0.03 mmol / L), which is then stored in the softened water tank 23 (6 cubic meters). When the demineralized water tank 13 is under heavy load or to conserve demineralized water, and the flushing water is to be replaced with softened water, the third regulating valve 106 is closed via the first control device 103, and the first regulating valve 102, the second regulating valve 105, and the constant pressure pump 24 (head 52 meters, output 42 t / h) are opened. Softened water from the makeup water tank 25 is then used for flushing operations. When the level in the softened water tank 23 is low, the constant pressure pump 24 and the first regulating valve 102 automatically close, and the fourth regulating valve 107 opens to replenish water to the makeup water tank 25, maintaining continuous flushing. When the level in the makeup water tank 25 is low, the third regulating valve 106 opens and the second regulating valve 105 closes, switching the flushing water to demineralized water to ensure continuous flushing of the air-cooled island.

[0044] The air-cooled island flushing operation at this plant runs from April to October each year, lasting 6 months (180 days). If demineralized water is used for all flushing, based on the flushing pump flow rate, approximately 19.8 tons of demineralized water are consumed per hour. With approximately 6 hours of flushing per day, the total demineralized water consumption is 19.8 × 6 × 180 = 21,384 tons. At 21.66 yuan per ton, the total cost is 21,384 × 21.66 = 463,177.44 yuan. If softened water is used for all air-cooled island flushing, the softened water consumption is 21,384 tons. At approximately 8.5 yuan per ton, the total cost is 21,384 × 8.5 = 181,764 yuan, resulting in a cost saving of 463,177.44 - 181,764 = 281,413.44 yuan.

[0045] It should be noted that the detailed structure of some devices in this utility model is not described in detail, but belongs to the prior art known to those skilled in the art, and therefore will not be described again here. In addition, the parts of this device not described are the same as or can be implemented using existing technology.

[0046] It should be noted that those skilled in the art, under the guidance of this utility model, can also make some modifications to the design of the above system. For example, the equipment in the system is also equipped with level gauges, overflow / nitrogen pipelines, etc.; pumps, pressure sensors, flow meters or temperature sensors are installed on the conveying pipelines inside the system in different units or devices, and different valves, such as pressure relief valves, pressure regulating valves, safety valves, pneumatic valves, etc., are also installed to regulate and stabilize the pressure of the entire system, and the opening degree of the valves can also be adjusted to regulate the flow rate of materials in the pipeline, etc.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A replaceable flushing system for a thermoelectric air-cooled island, characterized in that, include: Softening water unit, demineralized water unit, rinsing and collection unit, and air cooling unit; The demineralized water unit includes an ultrafiltration unit, a reverse osmosis unit, and a demineralized water tank connected in sequence in the demineralized water workshop; The softened water unit includes a dual-media filter, a sodium ion exchanger, a softened water tank, a constant pressure pump, and a water replenishment tank connected in sequence. The air-cooling unit includes at least one air cooler and at least one set of heat sinks; The flushing and collection unit includes a high-pressure pump connected by a pipeline, a flushing pipe corresponding to the heat sink on each of the air coolers, and a drain trough and a water collection tank corresponding to each of the air coolers. The demineralized water tank and the makeup water tank are respectively connected to the inlet of the high-pressure pump through pipes; the outlet of the reverse osmosis device is also connected to the inlet of the makeup water tank through a pipe; the outlet of the ultrafiltration device is also connected to the inlet of the dual-media filter.

2. The replaceable flushing system for a thermoelectric air-cooled island according to claim 1, characterized in that, The flushing pipe is equipped with a spray nozzle, a shower nozzle, or an atomizing nozzle on the side facing the heat sink.

3. The replaceable flushing system for a thermoelectric air-cooled island according to claim 1, characterized in that, The softened water tank is equipped with a first level gauge, which is a magnetic float level gauge; a first regulating valve is provided on the pipeline between the constant pressure pump and the water replenishment tank; the first regulating valve, the first level gauge and the constant pressure pump are interlocked through a first control device.

4. The replaceable flushing system for a thermoelectric air-cooled island according to claim 3, characterized in that, The water supply tank is equipped with a second level gauge, and a second regulating valve is installed on the pipeline between the water supply tank and the high-pressure pump; a third regulating valve is installed on the pipeline between the demineralized water tank and the high-pressure pump; the second level gauge, the second regulating valve, and the third regulating valve are interlocked through the first control device.

5. The replaceable flushing system for a thermoelectric air-cooled island according to claim 4, characterized in that, A fourth regulating valve is provided on the pipeline between the reverse osmosis unit and the water supply tank; the fourth regulating valve is interlocked with the second level gauge, the second regulating valve and the third regulating valve through the first control device.

6. The replaceable flushing system for a thermoelectric air-cooled island according to any one of claims 1-5, characterized in that, The water collection tank is connected to a wastewater tank via a booster pump.

7. The replaceable flushing system for a thermoelectric air-cooled island according to claim 6, characterized in that, A filter is installed between the water collection tank and the lift pump.

8. The replaceable flushing system for a thermoelectric air-cooled island according to claim 6, characterized in that, The water collection tank is equipped with a third level gauge, which is interlocked with the lift pump through a second control device.

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