A bipolar plate channel cleaning system based on soluble solid particles
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-18
- Publication Date
- 2026-08-14
AI Technical Summary
1.化学清洗液（如草酸）腐蚀流道内壁涂层，会造成燃料电池金属双极板钝化层脱落，石墨双极板孔隙率上升，缩短寿命；
在对流道进行清洗的过程中，混合器将固体颗粒按比例混合在去离子水中，残留清洗模块保持关闭，第一循环泵带动固液混合液将固液混合液以设定流速流经待清洗流道，在固液混合液流经待清洗流道的过程中，固液混合液中携带的固体颗粒对待清洗流道的内表面进行冲刷，待清洗流道内表面的固体污垢冲刷下后随固液混合液一起排出；当完成对待清洗流道的冲刷清洁后，残留清洗模块开启，混合器关闭，通过残留清洗模块将残留在待清洗流道内表面的固体颗粒清洗干净，实现自动清除残留的固体颗粒的技术效果。相较于现有技术中流道常用的清洗方法而言，通过固体颗粒以纯物理的手段对待清洗流道的内表面进行冲洗，无需拆解产品，污垢去除率高，内部残留少。
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Figure CN224629445U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of hydrogen fuel cell fabrication technology, and in particular to a bipolar plate flow channel cleaning system based on soluble solid particles. Background Technology
[0002] After a period of use, a certain amount of dirt will accumulate in the bipolar plate channels of a fuel cell. This not only affects heat exchange but also increases channel resistance and internal resistance, resulting in a decrease in fuel cell power generation efficiency. Therefore, it is necessary to clean the fuel cell bipolar plate channels regularly to extend their service life.
[0003] Currently, conventional bipolar plate flow channel cleaning methods have insurmountable drawbacks, mainly in the following aspects: 1. Chemical cleaning solutions (such as oxalic acid) corrode the coating on the inner wall of the flow channel, which can cause the passivation layer of the metal bipolar plate of the fuel cell to fall off, increase the porosity of the graphite bipolar plate, and shorten its lifespan. 2. Ultrasonic cleaning requires disassembling the product, resulting in high downtime costs, and the seals need to be replaced. 3. Pure water rinsing cannot remove hard carbon deposits (such as graphite debris in fuel cell systems), and pure water rinsing has a low graphite debris removal rate; 4. There is a problem that a small amount of residue remains inside the steel balls or silicone balls after cleaning, which cannot be discharged. Utility Model Content
[0004] To ensure effective cleaning of the bipolar plate flow channels while minimizing damage to the plates and reducing post-cleaning residue, this application provides a bipolar plate flow channel cleaning system based on soluble solid particles.
[0005] The bipolar plate flow channel cleaning system based on soluble solid particles provided in this application adopts the following technical solution: A bipolar plate flow channel cleaning system based on soluble solid particles includes a deionized water tank, a mixer, a solid particle storage tank, and a residual cleaning module for removing residual solid particles in the flow channel to be cleaned. The deionized water tank and the solid particle storage tank are both connected to the feed end of the mixer. The outlet end of the mixer is connected to a first pipe. A first three-way switching valve is installed on the first pipe. A second pipe is connected between the deionized water tank and the first three-way switching valve. The first pipe and the second pipe are respectively connected to the two inlet ends of the first three-way switching valve. The outlet end of the first three-way switching valve is connected to a third pipe, the outlet end of the third pipe is connected to the flow channel to be cleaned, and a first circulation pump is installed on the third pipe.
[0006] By adopting the above technical solution, during the cleaning process of the flow channel, the mixer mixes solid particles in deionized water in a certain proportion, the residual cleaning module remains closed, and the first circulation pump drives the solid-liquid mixture to flow through the flow channel to be cleaned at a set flow rate. During the flow of the solid-liquid mixture through the flow channel, the solid particles carried in the mixture flush the inner surface of the flow channel. The solid dirt on the inner surface of the flow channel is flushed off and discharged with the solid-liquid mixture. After the flushing and cleaning of the flow channel is completed, the residual cleaning module is turned on, and the mixer is turned off. The residual cleaning module cleans the solid particles remaining on the inner surface of the flow channel, achieving the technical effect of automatically removing residual solid particles. Compared with the commonly used cleaning methods for flow channels in the prior art, this method uses solid particles to rinse the inner surface of the flow channel using purely physical means, without disassembling the product, resulting in a high dirt removal rate and minimal internal residue.
[0007] Preferably, the solid particles in the solid particle storage tank are temperature-sensitive solid particles, and the outlet end of the flow channel to be cleaned is connected to a particle recovery module. The residual cleaning module includes a first heater installed on a second pipe.
[0008] By adopting the above technical solution, after the solid-liquid mixture has finished rinsing the channel to be cleaned, the first heater is started, the mixer is turned off, and the first circulating pump draws deionized water and flows through the first heater, the first three-way switching valve, and the third pipeline in sequence before passing through the channel to be cleaned. Since the solid particles are temperature-sensitive solid particles, the temperature of the deionized water can be raised by the first heater. When the heated deionized water flows through the channel to be cleaned, the solid particles remaining on the inner surface of the channel to be cleaned can be brushed off and dissolved into the deionized water, and finally flow to the particle recovery module.
[0009] Preferably, the temperature-sensitive solid particles are ammonium dihydrogen phosphate with a particle size of 50-150 μm.
[0010] By adopting the above technical solution, ammonium dihydrogen phosphate is insoluble in deionized water at room temperature (20°C) and exists in the form of solid particles; when the temperature of deionized water is heated to 65°C, ammonium dihydrogen phosphate is easily soluble in water. Taking advantage of this property, it is convenient to clean the solid particles of ammonium dihydrogen phosphate remaining on the inner surface of the channel to be cleaned, and at the same time, to realize the subsequent particle recovery and impurity removal process.
[0011] Preferably, the particle recovery module includes a second heater, a first particle filter, a recovery tank, a cooler, a solid-liquid separator, and a pulverizer; A fourth pipe connects the outlet end of the channel to be cleaned to the first particulate filter. The second heater is installed on the fourth pipe. The recovery tank is connected to the outlet end of the first particulate filter. The drain outlet of the first particulate filter is connected to the sewage system. The cooler is connected to the outlet end of the recovery tank, and the outlet end of the cooler is connected to the inlet end of the solid-liquid separator. The solid discharge end of the solid-liquid separator is connected to the crusher. The discharge end of the crusher is connected to the solid particle storage tank. The liquid discharge end of the solid-liquid separator is connected to the second particulate filter. The solid discharge end of the second particulate filter is connected to the recovery tank. The liquid discharge end of the second particulate filter is connected to the ion filter. The outlet end of the ion filter is connected to the inlet end of the deionized water tank.
[0012] By adopting the above technical solution, during the cleaning process, when the solid-liquid mixture carrying ammonium dihydrogen phosphate solid particles flows through the channel to be cleaned, the solid-liquid mixture carrying solid dirt flows through the second heater. The second heater raises the temperature of the solid-liquid mixture to 65°C, which allows the ammonium dihydrogen phosphate solid particles in the solid-liquid mixture to dissolve in the deionized water. Since the solid dirt is insoluble in deionized water, the dirt originally attached to the solid particles falls off and remains suspended in the solid-liquid mixture. The solid-liquid mixture carrying the solid dirt enters the first particle filter. After filtration, the solid dirt is discharged from the drain port, while the deionized water containing dissolved ammonium dihydrogen phosphate enters the recovery tank. After entering the recovery tank, the deionized water containing dissolved ammonium dihydrogen phosphate (MDP) enters the cooler. The cooler lowers the temperature, causing the MDP to precipitate as a solid. After separation by a solid-liquid separator, the solid MDP is pulverized into particles of the required size and returned to the solid particle storage tank. The discharged deionized water passes through a second particle filter and an ion filter before being recycled back to the deionized water tank. A small amount of solid MDP filtered through the second particle filter is then returned to the recovery tank for further recycling.
[0013] Preferably, the solid particles in the solid particle storage tank are solvent-sensitive, and the residual cleaning module includes a solvent storage tank, a second circulation pump, and a second three-way switching valve. The second three-way switching valve is installed on a third pipeline and is located between the first circulation pump and the flow channel to be cleaned. A fifth pipeline connects one of the inlet ends of the second three-way switching valve to the outlet end of the solvent storage tank. The second circulation pump is installed on the fifth pipeline, and the flow channel to be cleaned is connected to the sewage system through the drain outlet.
[0014] By adopting the above technical solution, during the cleaning process, the first three-way switching valve is connected to the inlet connected to the mixer, and the second three-way switching valve is connected to the inlet connected to the third pipeline. Solid particles and deionized water are mixed by the mixer and then pumped by the first circulating pump, flowing sequentially through the first three-way valve, the third pipeline, the second three-way valve, and the channel to be cleaned. The solid particles in the solid-liquid mixture flush away the solid dirt on the inner surface of the channel to be cleaned, and are discharged through the drain outlet, achieving the technical effect of cleaning the channel to be cleaned. When the solid-liquid mixture containing solid particles has finished cleaning the channel to be cleaned, the first three-way switching valve and the first... The circulation pump is turned off, and the second three-way switching valve is connected to the inlet connected to the solvent storage tank. The second circulation pump runs, driving the solvent in the solvent storage tank through the channel to be cleaned, causing the solid particles remaining on the inner surface of the channel to be cleaned to dissolve in the solvent and be discharged from the drain port along with the solvent. After all the solid particles on the inner surface of the channel to be cleaned have been dissolved and carried out by the solvent, the second three-way switching valve is connected to the inlet connected to the third pipe, and the first three-way switching valve is connected to the inlet connected to the second pipe. The first circulation pump starts, driving deionized water to flow through the channel to be cleaned, cleaning the solvent remaining on the inner surface of the channel to be cleaned, and then discharging it through the drain port.
[0015] Preferably, the solvent-sensitive solid particles are polyvinyl alcohol porous microspheres, and the particle size of the polyvinyl alcohol porous microspheres is 20-100 μm; The solvent stored in the solvent storage tank is hot water at 40-50°C or a 20% ethanol solution.
[0016] In summary, the bipolar plate flow channel cleaning system based on soluble solid particles proposed in this application has the following beneficial technical effects: During the cleaning process of the flow channel, the mixer mixes solid particles in deionized water in a specific ratio. The residual cleaning module remains closed. The first circulation pump drives the solid-liquid mixture to flow through the flow channel to be cleaned at a set flow rate. As the solid-liquid mixture flows through the flow channel, the solid particles carried in the mixture flush the inner surface of the flow channel. The solid dirt on the inner surface of the flow channel is flushed off and discharged with the solid-liquid mixture. After the flow channel is cleaned, the residual cleaning module is activated and the mixer is closed. The residual cleaning module removes the solid particles remaining on the inner surface of the flow channel, achieving the technical effect of automatically removing residual solid particles. Compared with the cleaning methods commonly used in existing flow channels, this method uses solid particles to rinse the inner surface of the flow channel through purely physical means, without disassembling the product, resulting in a high dirt removal rate and minimal internal residue. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of the flow channel cleaning system when the solid particles are temperature sensitive, as shown in Embodiment 1 of this application.
[0018] Figure 2 This is a schematic diagram of the overall structure of the flow channel cleaning system when the solid particles are solvent-sensitive, as shown in Embodiment 2 of this application.
[0019] Explanation of reference numerals in the attached diagram: 1. Deionized water tank; 11. Second pipe; 2. Mixer; 21. First pipe; 3. Solid particle storage tank; 4. First three-way switching valve; 41. Third pipe; 5. Flow channel to be cleaned; 51. Fourth pipe; 6. First circulation pump; 7. Residual cleaning module; 71. First heater; 72. Solvent storage tank; 73. Second circulation pump; 74. Second three-way switching valve; 75. Fifth pipe; 8. Particle recovery module; 81. Second heater; 82. First particle filter; 83. Cooler; 84. Solid-liquid separator; 85. Crusher; 86. Second particle filter; 87. Ion filter; 88. Recovery tank; 9. Drain outlet. Detailed Implementation
[0020] The following combination Figures 1-2 This application will be described in further detail.
[0021] Example 1 This application discloses a bipolar plate flow channel cleaning system based on soluble solid particles. (Refer to...) Figure 1 It includes a deionized water tank 1, a mixer 2, a solid particle storage tank 3, and a residual cleaning module 7 for removing residual solid particles from the flow channel 5 to be cleaned.
[0022] Both the deionized water tank 1 and the solid particle storage tank 3 are connected to the feed end of the mixer 2. The outlet end of the mixer 2 is connected to the first pipe 21. A first three-way switching valve 4 is installed on the first pipe 21. A second pipe 11 is connected between the deionized water tank 1 and the first three-way switching valve 4. The first pipe 21 and the second pipe 11 are respectively connected to the two inlet ends of the first three-way switching valve 4.
[0023] The outlet end of the first three-way switching valve 4 is connected to the third pipe 41, the outlet end of the third pipe 41 is connected to the flow channel 5 to be cleaned, and the first circulation pump 6 is installed on the third pipe 41.
[0024] During the cleaning process of the flow channel, the mixer 2 mixes solid particles in deionized water in a certain proportion, the residual cleaning module 7 remains closed, and the first circulation pump 6 drives the solid-liquid mixture to flow through the flow channel 5 to be cleaned at a set flow rate. As the solid-liquid mixture flows through the flow channel 5 to be cleaned, the solid particles carried in the solid-liquid mixture are flushed against the inner surface of the flow channel 5 to be cleaned. The solid dirt on the inner surface of the flow channel 5 to be cleaned is flushed off and discharged with the solid-liquid mixture. After the flushing and cleaning of the flow channel 5 to be cleaned is completed, the residual cleaning module 7 is turned on and the mixer 2 is turned off. The residual cleaning module 7 cleans the solid particles remaining on the inner surface of the flow channel 5 to be cleaned, achieving the technical effect of automatically removing residual solid particles.
[0025] Compared to the cleaning methods commonly used in existing technologies for flow channels, this method uses solid particles to rinse the inner surface of the flow channel 5 using purely physical means, without disassembling the product, resulting in a high dirt removal rate and minimal internal residue.
[0026] Reference Figure 1 In this embodiment, the solid particles in the solid particle storage tank 3 are temperature-sensitive solid particles, and the outlet end of the flow channel 5 to be cleaned is connected to the particle recovery module 8; the residual cleaning module 7 includes a first heater 71 installed on the second pipe 11.
[0027] After the solid-liquid mixture has finished rinsing the cleaning channel 5, the first heater 71 is started, the mixer 2 is turned off, and the first circulating pump 6 draws deionized water that flows sequentially through the first heater 71, the first three-way switching valve 4, and the third pipeline 41 before passing through the cleaning channel 5. Since the solid particles are temperature-sensitive, the temperature of the deionized water can be raised to 65°C by the first heater 71. When the heated deionized water flows through the cleaning channel 5, the solid particles remaining on the inner surface of the cleaning channel 5 can be brushed off and dissolved into the deionized water, and finally flow to the particle recovery module 8.
[0028] Furthermore, the temperature-sensitive solid particles are ammonium dihydrogen phosphate with a particle size of 50–150 μm. Ammonium dihydrogen phosphate is insoluble in deionized water at room temperature (20°C) and exists in the form of solid particles; when the temperature of deionized water is heated to 65°C, ammonium dihydrogen phosphate is readily soluble in water. Utilizing this property, it is convenient to clean the residual ammonium dihydrogen phosphate solid particles on the inner surface of the flow channel to be cleaned, while simultaneously realizing subsequent particle recovery and impurity removal processes.
[0029] The particle recovery module 8 includes a second heater 81, a first particle filter 82, a recovery tank 88, a cooler 83, a solid-liquid separator 84, and a crusher 85. A fourth pipe 51 connects the outlet end of the cleaning channel 5 to the first particle filter 82. The second heater 81 is installed on the fourth pipe 51. The recovery tank 88 is connected to the outlet end of the first particle filter 82. The drain outlet 9 of the first particle filter 82 is connected to the sewage system. The cooler 83 is connected to the outlet end of the recovery tank 88, and the outlet end of the cooler 83 is connected to the inlet end of the solid-liquid separator 84. The solid discharge end of the solid-liquid separator 84 is connected to the crusher 85, and the discharge end of the crusher 85 is connected to the solid particle storage tank 3. The liquid discharge end of the solid-liquid separator 84 is connected to the second particle filter 86. The solid discharge end of the second particle filter 86 is connected to the recovery tank 88. The liquid discharge end of the second particle filter 86 is connected to an ion filter 87, and the outlet end of the ion filter 87 is connected to the inlet end of the deionized water tank 1.
[0030] During the cleaning process, when the solid-liquid mixture carrying ammonium dihydrogen phosphate solid particles flows through the cleaning channel 5, the solid-liquid mixture carrying solid dirt flows through the second heater 81. The second heater 81 heats the solid-liquid mixture to 65°C, which allows the ammonium dihydrogen phosphate solid particles in the solid-liquid mixture to dissolve in deionized water. Since the solid dirt is insoluble in deionized water, the dirt originally attached to the solid particles falls off and is suspended in the solid-liquid mixture.
[0031] The solid-liquid mixture carrying solid dirt enters the first particle filter 82. After filtration, the solid dirt is discharged through the drain outlet 9, while the deionized water containing dissolved ammonium dihydrogen phosphate enters the recovery tank 88. After entering the recovery tank 88, the deionized water containing dissolved ammonium dihydrogen phosphate enters the cooler 83, where it is cooled to 15-20°C. The solubility of ammonium dihydrogen phosphate in the deionized water decreases, and it precipitates out in solid form. After separation by the solid-liquid separator 84, the solid ammonium dihydrogen phosphate is pulverized by the pulverizer 85 into solid particles that meet the particle size requirements and then returned to the solid particle storage tank 3. The discharged deionized water passes through the second particle filter 86 and the ion filter 87 and then flows back to the deionized water tank 1 for recycling. A small amount of solid ammonium dihydrogen phosphate filtered by the second particle filter 86 is returned to the recovery tank 88 through the solid discharge end for further recovery treatment.
[0032] The implementation principle of a bipolar plate flow channel cleaning system based on soluble solid particles in this application embodiment is as follows: During the cleaning process of the flow channel, the mixer 2 mixes solid particles in deionized water in a certain proportion, the residual cleaning module 7 remains closed, and the first circulation pump 6 drives the solid-liquid mixture to flow through the flow channel 5 to be cleaned at a set flow rate. During the flow of the solid-liquid mixture through the flow channel 5, the solid particles carried in the solid-liquid mixture are flushed against the inner surface of the flow channel 5. The solid dirt on the inner surface of the flow channel 5 is flushed off and discharged with the solid-liquid mixture. After the flushing and cleaning of the flow channel 5 is completed, the residual cleaning module 7 is turned on and the mixer 2 is turned off. The residual cleaning module 7 cleans the solid particles remaining on the inner surface of the flow channel 5, achieving the technical effect of automatically removing residual solid particles. Compared with the cleaning methods commonly used in the prior art for flow channels, this method uses solid particles to rinse the inner surface of the flow channel 5 by purely physical means, without disassembling the product, resulting in a high dirt removal rate and less internal residue.
[0033] Example 2 In this embodiment, the solid particles in the solid particle storage tank 3 are solvent-sensitive. (Refer to...) Figure 2 The residual cleaning module 7 includes a solvent storage tank 72, a second circulation pump 73, and a second three-way switching valve 74. The second three-way switching valve 74 is installed on the third pipe 41 and is located between the first circulation pump 6 and the flow channel 5 to be cleaned. A fifth pipe 75 connects one of the inlet ends of the second three-way switching valve 74 and the outlet end of the solvent storage tank 72. The second circulation pump 73 is installed on the fifth pipe 75. The flow channel 5 to be cleaned is connected to the sewage system through the drain outlet 9.
[0034] During the cleaning process, the first three-way switching valve 4 is connected to the inlet connected to the mixer 2, and the second three-way switching valve 74 is connected to the inlet connected to the third pipeline 41. After being mixed by the mixer 2, the solid particles and deionized water are pumped by the first circulating pump 6 and flow sequentially through the first three-way valve 4, the third pipeline 41, the second three-way valve 74, and the channel to be cleaned 5. The solid particles in the solid-liquid mixture flush and clean the solid dirt on the inner surface of the channel to be cleaned 5, thereby achieving the technical effect of cleaning the channel to be cleaned 5.
[0035] When the solid-liquid mixture containing solid particles is cleaned, the first three-way switching valve 4 and the first circulation pump 6 are closed, the second three-way switching valve 74 is connected to the inlet connected to the solvent storage tank 72, the second circulation pump 73 is running, and the solvent in the solvent storage tank 72 is driven through the cleaned channel 5, so that the solid particles remaining on the inner surface of the cleaned channel 5 are dissolved in the solvent and discharged from the drain port 9 together with the solvent.
[0036] After all the residual solid particles on the inner surface of the channel to be cleaned 5 are dissolved and carried out by the solvent, the second three-way switching valve 74 is connected to the inlet connected to the third pipe 41, the first three-way switching valve 4 is connected to the inlet connected to the second pipe 11, the first circulation pump 6 is started, and deionized water flows through the channel to be cleaned 5 to clean the residual solvent on the inner surface of the channel to be cleaned 5.
[0037] It should be noted that the solvent-sensitive solid particles are polyvinyl alcohol porous microspheres with a particle size of 20–100 μm; the solvent stored in solvent storage tank 72 is hot water at 40–50 °C or a 20% concentration ethanol solution.
[0038] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A bipolar plate flow channel cleaning system based on dissolvable solid particles, characterized by, It includes a deionized water tank (1), a mixer (2), a solid particle storage tank (3), and a residual cleaning module (7) for removing residual solid particles in the flow channel (5) to be cleaned; The deionized water tank (1) and the solid particle storage tank (3) are both connected to the feed end of the mixer (2). The outlet end of the mixer (2) is connected to a first pipe (21). A first three-way switching valve (4) is installed on the first pipe (21). A second pipe (11) is connected between the deionized water tank (1) and the first three-way switching valve (4). The first pipe (21) and the second pipe (11) are respectively connected to the two inlet ends of the first three-way switching valve (4). The outlet end of the first three-way switching valve (4) is connected to a third pipe (41), the outlet end of the third pipe (41) is connected to the flow channel (5) to be cleaned, and a first circulation pump (6) is installed on the third pipe (41).
2. A dissolvable solid particle based bipolar plate flow channel cleaning system according to claim 1, wherein, The solid particles in the solid particle storage tank (3) are temperature-sensitive solid particles, and the outlet end of the flow channel (5) to be cleaned is connected to a particle recovery module (8). The residual cleaning module (7) includes a first heater (71) installed on the second pipe (11).
3. A dissolvable solid particle based bipolar plate flow channel cleaning system according to claim 2, wherein, The temperature-sensitive solid particles are ammonium dihydrogen phosphate with a particle size of 50–150 μm.
4. A dissolvable solid particle based bipolar plate flow channel cleaning system according to claim 3, wherein, The particle recovery module (8) includes a second heater (81), a first particle filter (82), a recovery tank (88), a cooler (83), a solid-liquid separator (84), and a pulverizer (85); A fourth pipe (51) connects the outlet end of the flow channel (5) to the first particulate filter (82). The second heater (81) is installed on the fourth pipe (51). The recovery tank (88) is connected to the outlet end of the first particulate filter (82). The drain outlet (9) of the first particulate filter (82) is connected to the sewage system. The cooler (83) is connected to the outlet end of the recovery tank (88), and the outlet end of the cooler (83) is connected to the inlet end of the solid-liquid separator (84). The solid discharge end of the solid-liquid separator (84) is connected to the crusher (85), and the discharge end of the crusher (85) is connected to the solid particle storage tank (3); the liquid discharge end of the solid-liquid separator (84) is connected to the second particle filter (86), the solid discharge end of the second particle filter (86) is connected to the recovery tank (88), the liquid discharge end of the second particle filter (86) is connected to the ion filter (87), and the outlet end of the ion filter (87) is connected to the inlet end of the deionized water tank (1).
5. A dissolvable solid particle based bipolar plate flow channel cleaning system according to claim 1, wherein, The solid particles in the solid particle storage tank (3) are solvent-sensitive. The residual cleaning module (7) includes a solvent storage tank (72), a second circulation pump (73) and a second three-way switching valve (74). The second three-way switching valve (74) is installed on the third pipeline (41) and is located between the first circulation pump (6) and the flow channel to be cleaned (5). A fifth pipe (75) is connected between one of the inlet ends of the second three-way switching valve (74) and the outlet end of the solvent storage tank (72). The second circulation pump (73) is installed on the fifth pipe (75). The flow channel (5) to be cleaned is connected to the sewage system through the drain port (9).
6. A dissolvable solid particle based bipolar plate flow channel cleaning system according to claim 5, wherein, The solvent-sensitive solid particles are polyvinyl alcohol porous microspheres, and the particle size of the polyvinyl alcohol porous microspheres is 20-100 μm; The solvent stored in the solvent storage tank (72) is hot water at 40-50°C or a 20% concentration ethanol solution.