Device and method for detecting water leakage of fuel cell system

Abstract

The invention relates to a fuel cell system water leakage detection device and method, and belongs to the technical field of fuel cells. The fuel cell system water leakage detection device comprises a leakage detection sensor, a fuel cell, a main control board, a water supply device, a water purification device and a waste water device, the water supply device, the water purification device and the fuel cell are sequentially connected through pipelines, and a waste water outlet of the water purification device is connected with an inlet of the waste water device. The water supply equipment, the water purification equipment and the wastewater equipment are located above the leakage detection sensor, and the leakage detection sensor, the fuel cell, the water supply equipment and the wastewater equipment are respectively connected with the main control board. According to the water leakage detection device for the fuel cell system, whether a water leakage phenomenon exists in the fuel cell system or not is detected through the leakage detection sensor, so that a worker can take corresponding measures in time to solve the water leakage problem, and the situation that a fuel cell crashes due to aggravation of water leakage is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a device and method for detecting water leakage in a fuel cell system. Background Art

[0002] Solid Oxide Fuel Cell (SOFC) is a fully solid-state chemical power generation device that directly converts the chemical energy in hydrogen, natural gas, coal gas and other hydrocarbon fuels and oxidants into electrical energy in an efficient and environmentally friendly manner at high temperatures. The core of the SOFC system is the fuel cell stack, and its peripheral auxiliary systems include gas safety management system, water treatment system, power management system, etc., in order to provide the most suitable reaction conditions for the gas.

[0003] Fuel cells need water to generate electricity through chemical reactions, and the quality of water will affect the efficiency of fuel cell power generation. Therefore, a stable supply of water is a key factor in the electrochemical reaction of fuel cells. Existing SOFC systems are not equipped with water leakage detection equipment. Once a water leak occurs in the system, it cannot be detected in time and emergency measures cannot be taken in time, resulting in fuel cells failing due to lack of water, carbon deposition, and clogging of pipelines, and being unable to work normally.

[0004] Therefore, it is very necessary to design a fuel cell system water leakage detection device. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a fuel cell system water leakage detection device and method.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] In the first aspect, a fuel cell system water leakage detection device provided by the present invention includes a leakage detection sensor, a fuel cell, a main control board, a water supply equipment, a water purification equipment and a wastewater equipment, wherein the water supply equipment, the water purification equipment and the fuel cell are connected in sequence through pipelines, the wastewater outlet of the water purification equipment is connected to the inlet of the wastewater equipment, the fuel cell, the water supply equipment, the water purification equipment and the wastewater equipment are respectively installed in the internal space of the fuel cell system, the water supply equipment, the water purification equipment and the wastewater equipment are located above the leakage detection sensor, and the leakage detection sensor, the fuel cell, the water supply equipment, the water purification equipment and the wastewater equipment are respectively connected to the main control board; the leakage detection sensor has N groups of electrode probes, and N is a positive integer not less than 1.

[0008] Preferably, the fuel cell system water leakage detection device also includes a pure water device, which is installed in the internal space of the fuel cell system. The water supply equipment, water purification equipment, pure water equipment and fuel cell are connected in sequence through pipelines. The pure water equipment is located above the leakage detection sensor, and the pure water equipment is connected to the main control board.

[0009] Preferably, the fuel cell system water leakage detection device further comprises a drain pipe, on which a drain valve is provided, and the drain valve is connected to the main control board.

[0010] Furthermore, in the fuel cell system, the position of the drain valve is not higher than the position of the leakage detection sensor.

[0011] Preferably, the electrode probe comprises a connecting portion, a first electrode and a second electrode, a gap is left between the first electrode and the second electrode, and one end of the second electrode away from the first electrode is connected to the connecting portion.

[0012] Further preferably, an area of ​​a surface of the first electrode close to the second electrode is equal to an area of ​​a surface of the second electrode close to the first electrode.

[0013] Further preferably, N is a positive integer not less than 2. For example, N can be 2, 3, 4, 5, 6 or a range consisting of any two values ​​therein.

[0014] More preferably, the first electrodes in the N groups of electrode probes are distributed in parallel with equal intervals in the vertical direction, and in each group of electrode probes, the first electrode and the second electrode are horizontally aligned with each other; the lowest electrode probe in the N groups of electrode probes is arranged at the bottom of the internal space of the fuel cell system.

[0015] Preferably, the first electrode, the second electrode and the connecting part are all made of metal, an insulating layer is provided on the surface of the first electrode except for one side close to the second electrode, an insulating layer is provided on the surface of the second electrode except for one side close to the first electrode, and an insulating layer is provided on the outer surface of the connecting part.

[0016] Preferably, the leakage detection sensor further includes a thermistor, and the thermistor is disposed on the second electrode.

[0017] In a second aspect, the present invention provides a method for detecting water leakage in a fuel cell system, and the method is implemented by the device for detecting water leakage in a fuel cell system described in the first aspect.

[0018] Preferably, the fuel cell system water leakage detection method comprises the following steps:

[0019] S1. During the operation of the fuel cell system, detecting the real-time voltage values ​​reflected by N target detection areas, wherein the target detection area is the area between the first electrode and the second electrode in the electrode probe;

[0020] S2. Calculate the real-time medium conductivity of the N target detection areas according to the real-time voltage values ​​of the N target detection areas:

[0021] S3. Compare and analyze the real-time medium conductivity of the N target detection areas with the preset conductivity threshold, and generate alarm information according to the comparison and analysis results.

[0022] Further preferably, the alarm information includes at least one of the leakage area, the level of the leakage accident, and the rate level of the leakage accident escalation.

[0023] Further preferably, the preset conductivity threshold includes a first conductivity threshold δ1, and step S3 includes:

[0024] S31. The real-time medium conductivities of the N target detection areas are respectively compared with the first conductivity threshold δ1, and m target detection areas whose real-time medium conductivities are greater than δ1 are screened out. If 1≤m≤N, it is determined that a water leakage accident has occurred in the fuel cell system; if the real-time medium conductivities of the N target detection areas are all less than δ1, it is determined that the fuel cell system is operating normally.

[0025] More preferably, the preset conductivity threshold value further includes a second conductivity threshold value δ2 and a third conductivity threshold value δ3. If 1≤m≤N, step S31 further includes:

[0026] S32, comparing the real-time medium conductivity of the screened m target detection areas with the second conductivity threshold δ2 respectively, if the real-time medium conductivity of the screened m target detection areas is not greater than δ2, it is determined that there is a pure water leakage fault in the fuel cell system, and then the leakage area is determined to be the pure water equipment and the pipeline for transporting pure water;

[0027] If the real-time medium conductivity of the m selected target detection areas is greater than δ2, step S32 further includes:

[0028] S33, comparing the real-time medium conductivity of the screened m target detection areas with the third conductivity threshold δ3 respectively, if the real-time medium conductivity of the screened m target detection areas is not greater than δ3, it is determined that a water supply leakage fault has occurred in the fuel cell system, and then the leakage area is determined to be the water supply equipment and the pipeline for transporting the water supply;

[0029] If the real-time medium conductivity of the screened m target detection areas is greater than δ3, it is determined that a wastewater leakage fault has occurred in the fuel cell system, and then the leakage area is determined to be the wastewater equipment and the pipeline for transporting wastewater.

[0030] More preferably, step S31 includes:

[0031] S311, respectively comparing the real-time medium conductivity of N target detection areas with the first conductivity threshold δ1, screening out m target detection areas whose real-time medium conductivity is greater than δ1, if 1≤m≤N, it is determined that a water leakage accident has occurred in the fuel cell system; if the real-time medium conductivity of the N target detection areas is not greater than δ1, it is determined that the fuel cell system is operating normally;

[0032] S312. If 1≤m≤N, determine the level of the leakage accident according to m, and determine that the level of the current leakage accident is level m.

[0033] After step S312, the following steps are also included:

[0034] S313. According to the real-time medium conductivity of the screened m target detection areas, the corresponding detection time information is obtained, and the obtained detection time is used as the leakage time corresponding to the current leakage accident level to obtain the accident upgrade duration.

[0035] S314, according to the leakage time corresponding to the currently determined leakage accident level, obtain the leakage time corresponding to the m-1 level leakage accident within the preset time, and subtract the leakage time corresponding to the m-1 level leakage accident from the leakage time corresponding to the current leakage accident level to obtain the accident upgrade interval time;

[0036] The obtained accident escalation interval time t is compared with the accident escalation time threshold, and the rate level of leakage accident escalation is determined according to the comparison results.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The fuel cell system water leakage detection device of the present invention detects whether there is water leakage inside the fuel cell system through a leakage detection sensor, so that the staff can take corresponding measures to solve the water leakage problem in time to avoid the water leakage from worsening and causing the fuel cell to crash. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of the structure of a fuel cell system water leakage detection device provided by the present invention;

[0040] Figure 2 This is a schematic structural diagram of the leakage detection sensor provided by the present invention.

[0041] In the figure, 1-leak detection sensor, 11-first electrode, 12-second electrode, 13-connecting part, 14-thermistor, 2-fuel cell, 3-main control board, 4-water supply equipment, 5-water purification equipment, 6-wastewater equipment, 7-pure water equipment, 8-drain valve. DETAILED DESCRIPTION

[0042] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0043] See also Figure 1-2 In the first aspect, the present invention provides a fuel cell system water leakage detection device, including a leakage detection sensor 1, a fuel cell 2, a main control board 3, a water supply device 4, a water purification device 5 and a waste water device 6. The water supply device 4, the water purification device 5 and the fuel cell 2 are connected in sequence through pipelines, and the waste water outlet of the water purification device 5 is connected to the inlet of the waste water device 6. The fuel cell 2, the water supply device 4, the water purification device 5 and the waste water device 6 are respectively installed in the internal space of the fuel cell system, and the water supply device 4, the water purification device 5 and the waste water device 6 are located above the leakage detection sensor 1. The leakage detection sensor 1, the fuel cell 2, the water supply device 4, the water purification device 5 and the waste water device 6 are respectively connected to the main control board 3.

[0044] In the present invention, the water supply equipment 4, the water purification equipment 5 and the wastewater equipment 6 are located above the leakage detection sensor 1. When water leakage occurs in any of the water supply equipment 4, the water purification equipment 5 and the wastewater equipment 6, water will flow from high to low, so that the leakage detection sensor 1 located at the low place can detect the water leakage information and transmit the detected water leakage information to the main control board 3. The main control board 3 analyzes and compares the received water leakage information, and controls the working status of each device in the fuel cell system according to the analysis and comparison results.

[0045] In the present invention, the water supply device 4 is used to provide water, the water purification equipment 5 is a device for filtering and purifying water, and the wastewater equipment 6 is a device for discharging wastewater to the outside. The output end of the wastewater equipment 6 is connected to a wastewater discharge pipe and a flow control valve. The wastewater discharge pipe extends to the outside of the fuel cell system, and the flow control valve of the wastewater equipment 6 is connected to the main control board 3.

[0046] In one embodiment, the fuel cell system water leakage detection device also includes a pure water device 7, which is installed in the internal space of the fuel cell system. The water supply device 4, the water purification device 5, the pure water device 7 and the fuel cell 2 are connected in sequence through pipelines. The pure water device is located above the leakage detection sensor 1, and the pure water device 7 is connected to the main control board 3.

[0047] In the present invention, the pure water device 7 is a water storage device with a flow control valve at the output end, and the flow control valve of the pure water device 7 is connected to the main control board 3.

[0048] In one embodiment, the fuel cell system water leakage detection device further includes a drain pipe, on which a drain valve 8 is provided, and the drain valve 8 is connected to the main control board 3 .

[0049] Specifically, in the fuel cell system, the position of the drain valve 8 is not higher than the position of the leakage detection sensor 1 .

[0050] In one embodiment, the leakage detection sensor 1 is located at the bottom of the internal space of the fuel cell system.

[0051] In one embodiment, the leakage detection sensor 1 includes N groups of electrode probes, N is a positive integer not less than 1, the electrode probes include a connecting portion 13, a first electrode 11 and a second electrode 12, a gap is left between the first electrode 11 and the second electrode 12, the leakage detection sensor 1 is connected to the main control board 3, and the second electrode 12 is connected to the connecting portion 13 by an integrated molding manner.

[0052] Furthermore, in each set of electrode probes, the first electrode 11 and the second electrode 12 are horizontally aligned with each other, and the area of ​​a surface of the first electrode 11 close to the second electrode 12 is equal to the area of ​​a surface of the second electrode 12 close to the first electrode 11 .

[0053] Furthermore, N is a positive integer not less than 2. For example, N can be 2, 3, 4, 5, 6, or a range consisting of any two values ​​therein.

[0054] At least two groups of electrode probes are distributed in parallel at equal intervals in the vertical direction, wherein the electrode probes at the tail ends are arranged at the bottom of the internal space of the fuel cell system.

[0055] When any of the water supply equipment 4, water purification equipment 5, pure water equipment 7, wastewater equipment 8, and fuel cell 2 leaks, the leaked water will flow to the bottom of the fuel cell system and accumulate from the bottom of the system upwards. When the accumulated water overflows the electrode probe, the medium between the first electrode 11 and the second electrode 12 of the electrode probe changes from air to water, and the conductivity value detected by the leakage detection sensor 1 changes accordingly. The main control board compares the detected conductivity with the preset conductivity to determine whether a water leakage fault occurs in the fuel cell system. The electrode probe used in the present invention has the advantages of simple structure and small size.

[0056] Furthermore, the first electrode 11, the second electrode 12 and the connecting part 13 are all made of metal. An insulating layer is provided on the surface of the first electrode 11 except for a side close to the second electrode 12. An insulating layer is provided on the surface of the second electrode 12 except for a side close to the first electrode 11. An insulating layer is provided on the outer surface of the connecting part 13.

[0057] Furthermore, the leakage detection sensor 1 further includes a thermistor 14 , which is disposed on the second electrode 12 .

[0058] In the present invention, the connection part 13 is connected to the power supply of the main control board 3, and the end of the first electrode 11 away from the connection part is respectively connected to the voltage divider module and the signal acquisition interface of the main control board 3. The voltage divider module corresponding to each first electrode 11 is the same or has the same circuit composition structure.

[0059] In one embodiment, the main control board 3 is connected to a host computer; the host computer has a human-computer interaction interface; the host computer can be a computer, a mobile phone, a tablet, a panel or a touch screen.

[0060] In a second aspect, the present invention provides a method for detecting water leakage in a fuel cell system, and the method is implemented by the device for detecting water leakage in a fuel cell system described in the first aspect.

[0061] The fuel cell system water leakage detection method comprises the following steps:

[0062] S1. During the operation of the fuel cell system, detecting real-time voltage values ​​of N target detection areas, wherein the target detection area is an area between the first electrode and the second electrode in the electrode probe;

[0063] S2. Calculate the real-time medium conductivity of the N target detection areas according to the real-time voltage values ​​of the N target detection areas:

[0064] S3. Compare and analyze the real-time medium conductivity of the N target detection areas with the preset conductivity threshold, and generate alarm information according to the comparison and analysis results.

[0065] In one embodiment, after step S3, the method further includes:

[0066] S4. Send the generated alarm information to the host computer.

[0067] The target detection area corresponds to the electrode probe one by one. In each group of electrode probes, the medium between the first electrode 11 and the second electrode 12 (i.e., the medium of the target detection area) is equivalent to a variable resistor, and its resistance is represented by R; the first electrode 11 and the second electrode 12 are opposite to each other, and the areas of the two opposite surfaces are equal, which is the area S of the target detection area in the direction perpendicular to its length; the spacing between the first electrode 11 and the second electrode 12 is the length L of the target detection area; R is determined by S, L, and ρ, and the calculation formula is as follows: ρ = (R×S) / L, δ = 1 / ρ. In the present invention, L is preferably in the millimeter level, and S is preferably in the square millimeter level. The main control board 3 pre-stores the length L of each target detection area and the area S of each target detection area in a direction perpendicular to its length; during detection, the power supply of the main control board 3 forms a loop with the first electrode 11 and the second electrode 12 in a group of electrode probes and the voltage divider module, and the signal acquisition end of the main control board 3 collects the voltage value of the voltage divider module in real time, and then determines the voltage value between the first electrode 11 and the second electrode 12 in the electrode probe, and then calculates the real-time dielectric resistance value of the target detection area through the voltage value between the first electrode 11 and the second electrode 12 in the electrode probe (i.e., the target detection area), and then determines the real-time dielectric conductivity of the target detection area according to the real-time dielectric resistance value, the length L of each target detection area, and the area S of each target detection area in a direction perpendicular to its length, and compares and analyzes the real-time dielectric conductivity of the N target detection areas, and then compares and analyzes the results of the comparison.

[0068] The main control board 3 compares the real-time medium conductivity with the preset conductivity to determine whether a water leakage fault occurs in the fuel cell system.

[0069] In one embodiment, the alarm information includes at least one of a leakage area, a level of leakage accident, and a leakage degree level.

[0070] In one embodiment, if N is a positive integer not less than 2, the length of each target detection area is the same, and the area of ​​each target detection area in a direction perpendicular to its length is the same; the preset conductivity threshold includes a first conductivity threshold δ1, and step S3 includes:

[0071] S31. The real-time medium conductivities of the N target detection areas are respectively compared with the first conductivity threshold δ1, and m target detection areas whose real-time medium conductivities are greater than δ1 are screened out. If 1≤m≤N, it is determined that a water leakage accident has occurred in the fuel cell system; if the real-time medium conductivities of the N target detection areas are all less than δ1, it is determined that the fuel cell system is operating normally.

[0072] In the present invention, the first conductivity threshold δ1 is measured by the following method: during the normal operation of the fuel cell system (no water leakage occurs), the system is in a high temperature and high humidity state. In this state, the dielectric resistance value R1 of the target detection area is detected, and the conductivity is calculated based on the detected dielectric resistance values ​​R1, L and S. The dielectric conductivity of each target detection area is equal; the calculated conductivity is saved as the first conductivity threshold δ1.

[0073] Furthermore, the preset conductivity threshold value further includes a second conductivity threshold value δ2 and a third conductivity threshold value δ3. If 1≤m≤N, step S31 further includes:

[0074] S32, comparing the real-time medium conductivity of the screened m target detection areas with the second conductivity threshold δ2 respectively, if the real-time medium conductivity of the screened m target detection areas is not greater than δ2, it is determined that there is a pure water leakage fault in the fuel cell system, and then the leakage area is determined to be the pure water equipment and the pipeline for transporting pure water;

[0075] If the real-time medium conductivity of the m selected target detection areas is greater than δ2, step S32 further includes:

[0076] S33, comparing the real-time medium conductivity of the screened m target detection areas with the third conductivity threshold δ3 respectively, if the real-time medium conductivity of the screened m target detection areas is not greater than δ3, it is determined that a water supply leakage fault has occurred in the fuel cell system, and then the leakage area is determined to be the water supply equipment and the pipeline for transporting the water supply;

[0077] If the real-time medium conductivity of the screened m target detection areas is greater than δ3, it is determined that a wastewater leakage fault has occurred in the fuel cell system, and then the leakage area is determined to be the wastewater equipment and the pipeline that transports the wastewater;

[0078] The alarm information includes the leakage area.

[0079] In an actual application scenario, the conductivity of water provided by the water supply equipment in the fuel cell system is usually in the range of 1 to 10 μS / cm, the conductivity of pure water in the pure water equipment is usually in the range of 0.055 to 1 μS / cm, and the conductivity of wastewater in the wastewater equipment is usually greater than 10 μS / cm. The second conductivity threshold δ2 is preset to 1 μS / cm, and the third conductivity threshold δ3 is preset to 10 μS / cm. If the real-time medium conductivity of the N target detection areas is not greater than δ1, it is determined that the fuel cell system is operating normally; if m target detection areas with real-time medium conductivity greater than δ1 are screened out, if 1≤m≤N, it is determined that a water leakage accident has occurred in the fuel cell system, and the drain valve 8 can be controlled to open by the main control board 3, and the water in the fuel cell system is discharged through the drain pipe and the drain valve, and the main control board 3 can also be used to control the various devices in the fuel cell system to stop working. If the real-time dielectric conductivity of the m selected target detection areas is greater than δ1 and less than or equal to δ2, it is determined that there is a pure water leakage fault in the fuel cell system, that is, a water leakage fault occurs in the pipeline for conveying pure water or a pure water device for storing pure water; if the real-time dielectric conductivity of the m selected target detection areas is greater than δ2 and less than or equal to δ3, it is determined that there is a water supply leakage fault in the fuel cell system, and a water leakage fault occurs in the water supply device or a pipeline connected to the water supply device; if the real-time dielectric conductivity of the m selected target detection areas is greater than δ3, it is determined that there is a wastewater leakage fault in the fuel cell system, that is, a water leakage fault occurs in the wastewater device and a pipeline for conveying wastewater. The method of the present invention can determine the area where a water leakage fault occurs in the fuel cell system, thereby facilitating the staff to handle the corresponding faulty equipment in a timely manner.

[0080] Further, step S31 includes:

[0081] S311, respectively comparing the real-time medium conductivity of N target detection areas with the first conductivity threshold δ1, screening out m target detection areas whose real-time medium conductivity is greater than δ1, if 1≤m≤N, it is determined that a water leakage accident has occurred in the fuel cell system; if the real-time medium conductivity of the N target detection areas is not greater than δ1, it is determined that the fuel cell system is operating normally;

[0082] S312, if 1≤m≤N, determine the level of the leakage accident according to m, and determine that the level of the current leakage accident is level m;

[0083] The alarm information includes the level of the leakage accident.

[0084] For example, if m=1, the level of the leakage accident is determined to be level one, and the main control board 3 sends the alarm information to the host computer; if m=2, the level of the leakage accident is determined to be level two; if m=3, the level of the leakage accident is determined to be level three; if m=4, the level of the leakage accident is determined to be level four.

[0085] If m=2, step S33 also includes: controlling the drain valve to open; if m=3, step S33 also includes: controlling the fuel cell to reduce the load; if m≥4, step S33 also includes: controlling each device in the fuel cell system to stop working, and controlling each valve in the fuel cell system to close.

[0086] Furthermore, if m=3, and the leakage area is the pure water equipment and the pipeline for transporting pure water, step S33 also includes: controlling the working state of the flow control valve at the output end of the pure water equipment so that the pure water input flow of the fuel cell is controlled not to be greater than the preset flow.

[0087] For example, when m=3, and the leakage area is the pure water equipment and the pipeline for conveying pure water, the pure water input flow rate of the fuel cell is appropriately reduced to put the fuel cell system into a heat preservation state.

[0088] It is understandable that fuel cells require a continuous supply of water to react. If the water supply is insufficient, the fuel cell cannot react completely. During normal operation, water and fuel react in a certain proportion to generate a certain amount of electricity; if the water supply is reduced due to leakage, and the fuel supply remains unchanged, the amount of electricity generated by the fuel cell will decrease, increasing the cost. If m=3, and the leakage area is the water supply equipment and the pipeline for transporting water supply, the water supply equipment is controlled to stop working and stop supplying water to the water purification device; if the leakage area is the wastewater equipment and the pipeline for transporting wastewater, the wastewater equipment is controlled to be closed and stop discharging wastewater; and if the leakage area is the pure water equipment and the pipeline for transporting pure water, the pure water equipment is controlled to reduce the water supply to the fuel cell according to the load reduction and insulation of the fuel cell, so that the system enters the insulation state.

[0089] Furthermore, after step S312, the following steps are further included:

[0090] S313. According to the real-time medium conductivity of the screened m target detection areas, the corresponding detection time information is obtained, and the obtained detection time is used as the leakage time corresponding to the current leakage accident level to obtain the accident upgrade duration.

[0091] S314, according to the leakage time corresponding to the currently determined leakage accident level, obtain the leakage time corresponding to the m-1 level leakage accident within the preset time, and subtract the leakage time corresponding to the m-1 level leakage accident from the leakage time corresponding to the current leakage accident level to obtain the accident upgrade interval time;

[0092] The obtained accident escalation interval time t is compared with the accident escalation time threshold, and the rate level of leakage accident escalation is determined according to the comparison results;

[0093] The alarm information includes the rate level of escalation of the leakage accident.

[0094] The cut-off point of the preset time is the leakage time corresponding to the current leakage level determination result.

[0095] Specifically, the accident escalation time threshold includes a first accident escalation time threshold T1, a first accident escalation time threshold T2, and a first accident escalation time threshold T3, wherein T3<T2<T1;

[0096] If t>T1, the rate level of the leakage accident escalation is determined to be micro leakage, and the drain valve is controlled to open; if T2<t≤T1, the rate level of the leakage accident escalation is determined to be medium leakage, and the drain valve is controlled to open; if T3<t≤T2, the rate level of the leakage accident escalation is determined to be super leakage, and the drain valve is controlled to open;

[0097] By comparing the accident upgrade interval t with the preset time interval, the severity of the leakage accident can be reflected. If t>T1, it means that the leakage rate is low, and it may be that the pipe joints in the system are not plugged in tightly, and there is dripping; if T2<t≤T1, the leakage rate is high, and there may be a water pipe rupture and water spray; if T3<t≤T2, the leakage rate is very high, and there may be a pipe detachment or equipment leakage. Control the drain valve to open and drain water in time.

[0098] In the description of the present invention, it should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. All directional indicators (such as up and down) in the present invention are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0099] In the description of the present invention, it should also be noted that the terms "include", "have" and any variations thereof are intended to cover non-exclusive inclusions.

[0100] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be direct connection or indirect connection through an intermediate medium.

[0101] For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A fuel cell system water leakage detection device, characterized in that: It includes a leakage detection sensor, a fuel cell, a main control board, a water supply device, a water purification device and a wastewater device. The water supply device, the water purification device and the fuel cell are connected in sequence through pipelines. The wastewater outlet of the water purification device is connected to the inlet of the wastewater device. The fuel cell, the water supply device, the water purification device and the wastewater device are respectively installed in the internal space of the fuel cell system. The water supply device, the water purification device and the wastewater device are located above the leakage detection sensor. The leakage detection sensor, the fuel cell, the water supply device and the wastewater device are respectively connected to the main control board; the leakage detection sensor has N groups of electrode probes, and N is a positive integer not less than 1.

2. The fuel cell system water leakage detection device according to claim 1, characterized in that: The electrode probe comprises a connecting portion, a first electrode and a second electrode, a gap is left between the first electrode and the second electrode, the first electrode is connected to the main control board, and an end of the second electrode away from the first electrode is connected to the connecting portion.

3. The fuel cell system water leakage detection device according to claim 2, characterized in that: In each group of electrode probes, the first electrode and the second electrode are horizontally aligned with each other, and an area of ​​a surface of the first electrode close to the second electrode is equal to an area of ​​a surface of the second electrode close to the first electrode.

4. The fuel cell system water leakage detection device according to claim 2, characterized in that: N is a positive integer not less than 2, the first electrodes in the N groups of electrode probes are distributed in parallel at equal intervals in the vertical direction, and in each group of electrode probes, the first electrode and the second electrode are horizontally aligned with each other; the lowest electrode probe in the N groups of electrode probes is arranged at the bottom of the internal space of the fuel cell system.

5. A method for detecting water leakage in a fuel cell system, characterized in that: The method is implemented by the fuel cell system water leakage detection device according to any one of claims 1 to 4.

6. The fuel cell system water leakage detection method according to claim 5, characterized in that: The steps include: S1. During the operation of the fuel cell system, detecting the real-time voltage values ​​reflected by N target detection areas, wherein the target detection area is the area between the first electrode and the second electrode in the electrode probe; S2. Calculate the real-time medium conductivity of the N target detection areas according to the real-time voltage values ​​of the N target detection areas: S3. Compare and analyze the real-time medium conductivity of the N target detection areas with the preset conductivity threshold, and generate alarm information according to the comparison and analysis results.

7. The fuel cell system water leakage detection method according to claim 6, characterized in that: The preset conductivity threshold includes a first conductivity threshold δ1, and step S3 includes: S31. The real-time medium conductivities of the N target detection areas are respectively compared with the first conductivity threshold δ1, and m target detection areas whose real-time medium conductivities are greater than δ1 are screened out. If 1≤m≤N, it is determined that a water leakage accident has occurred in the fuel cell system; if the real-time medium conductivities of the N target detection areas are all less than δ1, it is determined that the fuel cell system is operating normally.

8. The fuel cell system water leakage detection method according to claim 7, characterized in that: The preset conductivity threshold value also includes a second conductivity threshold value δ2 and a third conductivity threshold value δ3. If 1≤m≤N, step S31 further includes: S32, comparing the real-time medium conductivity of the screened m target detection areas with the second conductivity threshold δ2 respectively, if the real-time medium conductivity of the screened m target detection areas is not greater than δ2, it is determined that there is a pure water leakage fault in the fuel cell system, and then the leakage area is determined to be the pure water equipment and the pipeline for transporting pure water; If the real-time medium conductivity of the m selected target detection areas is greater than δ2, step S32 further includes: S33, comparing the real-time medium conductivity of the screened m target detection areas with the third conductivity threshold δ3 respectively, if the real-time medium conductivity of the screened m target detection areas is not greater than δ3, it is determined that a water supply leakage fault has occurred in the fuel cell system, and then the leakage area is determined to be the water supply equipment and the pipeline for transporting the water supply; If the real-time medium conductivity of the screened m target detection areas is greater than δ3, it is determined that a wastewater leakage fault has occurred in the fuel cell system, and then the leakage area is determined to be the wastewater equipment and the pipeline for transporting wastewater.

9. The fuel cell system water leakage detection method according to claim 7, characterized in that: Step S31 includes: S311, respectively comparing the real-time medium conductivity of N target detection areas with the first conductivity threshold δ1, screening out m target detection areas whose real-time medium conductivity is greater than δ1, if 1≤m≤N, it is determined that a water leakage accident has occurred in the fuel cell system; if the real-time medium conductivity of the N target detection areas is not greater than δ1, it is determined that the fuel cell system is operating normally; S312. If 1≤m≤N, determine the level of the leakage accident according to m, and determine that the level of the current leakage accident is level m.

10. The fuel cell system water leakage detection method according to claim 9, characterized in that: After step S312, the following steps are also included: S313, according to the real-time medium conductivity of the screened m target detection areas, obtain the corresponding detection time information, use the obtained detection time as the leakage time corresponding to the current leakage accident level, and obtain the accident upgrade duration; S314, according to the leakage time corresponding to the currently determined leakage accident level, obtain the leakage time corresponding to the m-1 level leakage accident within the preset time, and subtract the leakage time corresponding to the m-1 level leakage accident from the leakage time corresponding to the current leakage accident level to obtain the accident upgrade interval time; The obtained accident escalation interval time t is compared with the accident escalation time threshold, and the rate level of leakage accident escalation is determined according to the comparison results.

Images