Gas-liquid mixture emission control method, device, system and equipment of fuel cell and medium

Abstract

The invention discloses a gas-liquid mixture discharge control method, device, system and equipment of a fuel cell and a medium, and the output end of the fuel cell is connected with a steam-water mixing box provided with a tail discharge valve. In response to the discharge prohibition signal, transmitting the gas-liquid mixture to a steam-water mixing box for storage, and acquiring control parameters including signal duration and a first liquid level signal value; calling a steam-water mixing box to discharge a gas-liquid mixture generated by the fuel cell according to the control parameters; wherein the signal duration is the total duration of receiving the discharge prohibition signal, and the first liquid level signal value is a feedback signal value according to the real-time liquid level capacity of the steam-water mixing box after the gas-liquid mixture is discharged to the steam-water mixing box. According to the invention, the gas-liquid mixture can be prevented from being discharged in a non-ventilated area, the use risk is reduced, the discharge control efficiency can be improved, and the zero-hydrogen effect is realized.

Description

Background Art

[0002] As global environmental problems become increasingly serious, fuel cells, as a clean energy with zero or low emissions, are considered to be one of the important technologies to achieve the goal of carbon neutrality. Since the energy conversion efficiency of fuel cells is much higher than that of traditional engine energy conversion processes, its theoretical energy conversion efficiency can reach more than 80%. This high efficiency gives fuel cells significant advantages in energy utilization and can be applied to automobiles, aircraft, ships, and fixed power sources.

[0003] With the continuous development and application of hydrogen fuel cell technology, hydrogen fuel cells can be used in the field of rail transportation. Since the hydrogen fuel cell system cannot achieve 100% electrochemical reaction efficiency, the fuel cell will discharge a gas-liquid mixture (including ionized water, hydrogen, nitrogen, etc.) under different working conditions. In order to discharge the gas-liquid mixture reasonably and efficiently, the commonly used method is to set a switch valve at one end of the fuel cell. When the fuel cell produces a gas-liquid mixture, the switch valve is controlled to open to discharge the gas-liquid mixture.

[0004] However, the currently commonly used methods have the following technical problems: Since the gas-liquid mixture contains hydrogen, if the gas-liquid mixture is discharged in a closed or differentially ventilated space, hydrogen is likely to accumulate in the closed or differentially ventilated space, and once it encounters an open flame, it is prone to explosion, thus posing a great hidden danger to the application of fuel cells. Summary of the invention

[0005] The present invention provides a method, device, system, equipment and medium for controlling the emission of a gas-liquid mixture of a fuel cell. The method can solve the technical problems of the prior art that multiple emissions are required, the operation is cumbersome and the processing efficiency is low.

[0006] A first aspect of an embodiment of the present invention provides a method for controlling gas-liquid mixture emission of a fuel cell, wherein an output end of the fuel cell is connected to a steam-water mixing box provided with a tail exhaust valve, and the method comprises:

[0007] When the fuel cell generates a gas-liquid mixture during operation, the gas-liquid mixture is transmitted to the soda-water mixing tank for storage in response to the emission prohibition signal and control parameters are obtained, wherein the control parameters include: signal duration and a first liquid level signal value;

[0008] calling the gas-water mixing box to discharge the gas-liquid mixture generated by the fuel cell according to the control parameters;

[0009] Among them, the signal duration is the total duration of receiving the discharge prohibition signal, and the first liquid level signal value is the feedback signal value based on the real-time liquid level capacity of the soda-water mixing tank after the gas-liquid mixture is discharged into the soda-water mixing tank.

[0010] In combination with the first aspect, in one implementation, calling the gas-water mixing box to discharge the gas-liquid mixture generated by the fuel cell according to the control parameter includes:

[0011] If the signal duration is less than the first preset duration, the tail valve is controlled to move according to the first liquid level signal value, and the gas-liquid mixture generated by the fuel cell in the steam-water mixing tank is discharged;

[0012] If the signal duration is greater than the first preset duration or the signal duration is greater than the second preset duration and the signal value of the first liquid level signal is equal to the second preset value, the tail drain valve is closed to allow the gas-liquid mixture generated by the fuel cell in the soda-water mixing tank to be discharged, and the fuel cell is controlled to switch from the running state to the shutdown state, wherein the first preset duration is greater than the second preset duration.

[0013] In combination with the first aspect, in one implementation, controlling the activity of the tail drain valve according to the first liquid level signal value includes:

[0014] If the first liquid level signal value is equal to a first preset value, the tail valve is controlled to perform an opening and closing activity according to a preset first activity duration and a preset first activity frequency;

[0015] If the first liquid level signal value is equal to the second preset value, the tail exhaust valve is controlled to be normally open.

[0016] In combination with the first aspect, in one implementation, after the step of controlling the tail exhaust valve to be normally open, the method further includes:

[0017] Acquire a second liquid level signal value, where the second liquid level signal value is a feedback signal value according to a real-time liquid level capacity of the soda-water mixing tank when the soda-water mixing tank discharges a gas-liquid mixture;

[0018] If the second liquid level signal value is equal to the first preset value, the tail exhaust valve is controlled to perform opening and closing activities according to the preset second activity duration and the preset second activity frequency.

[0019] In combination with the first aspect, in an implementation manner, before the step of obtaining the control parameter, the method further includes:

[0020] After closing the tail exhaust valve, the current value of the fuel cell is adjusted to a preset current interval value and the pressure difference of the fuel cell is adjusted to a preset pressure interval value. The pressure difference is the pressure difference between the hydrogen path of the fuel cell exhausting hydrogen and the air path of the environment.

[0021] In combination with the first aspect, in an implementation manner, before the step of obtaining the control parameter, the method further includes:

[0022] After receiving the emission prohibition signal, if it is determined that the fuel cell is to be shut down, the tail exhaust valve is closed.

[0023] A second aspect of an embodiment of the present invention provides a gas-liquid mixture emission control device for a fuel cell, wherein the output end of the fuel cell is connected to a steam-water mixing box provided with a tail exhaust valve, and the device comprises:

[0024] A parameter acquisition module is used for transmitting the gas-liquid mixture to a gas-water mixing tank for storage and acquiring control parameters in response to a discharge prohibition signal when the fuel cell generates a gas-liquid mixture during operation, wherein the control parameters include: signal duration and a first liquid level signal value;

[0025] A discharge control module, used for calling the gas-water mixing box to discharge the gas-liquid mixture generated by the fuel cell according to the control parameters;

[0026] Among them, the signal duration is the total duration of continuously receiving the hydrogen emission signal, and the first liquid level signal value is the feedback signal value based on the real-time liquid level capacity of the soda-water mixing tank when the gas-liquid mixture emission of the fuel cell is controlled to the soda-water mixing tank.

[0027] In conjunction with the second aspect, in one implementation, the emission control module is further used to:

[0028] If the signal duration is less than the first preset duration, the tail valve is controlled to move according to the first liquid level signal value, and the gas-liquid mixture generated by the fuel cell in the steam-water mixing tank is discharged;

[0029] If the signal duration is greater than the first preset duration or the signal duration is greater than the second preset duration and the signal value of the first liquid level signal is equal to the second preset value, the tail drain valve is closed to allow the gas-liquid mixture generated by the fuel cell in the soda-water mixing tank to be discharged, and the fuel cell is controlled to switch from the running state to the shutdown state, wherein the first preset duration is greater than the second preset duration.

[0030] In conjunction with the second aspect, in one implementation, the emission control module is further used to:

[0031] If the first liquid level signal value is equal to a first preset value, the tail valve is controlled to perform an opening and closing activity according to a preset first activity duration and a preset first activity frequency;

[0032] If the first liquid level signal value is equal to the second preset value, the tail exhaust valve is controlled to be normally open.

[0033] In conjunction with the second aspect, in one implementation, the emission control module is further used to:

[0034] Acquire a second liquid level signal value, where the second liquid level signal value is a feedback signal value according to a real-time liquid level capacity of the soda-water mixing tank when the soda-water mixing tank discharges a gas-liquid mixture;

[0035] If the second liquid level signal value is equal to the first preset value, the tail exhaust valve is controlled to perform opening and closing activities according to the preset second activity duration and the preset second activity frequency.

[0036] In conjunction with the second aspect, in one implementation, the device further includes:

[0037] The current and air pressure adjustment module is used to adjust the current value of the fuel cell to a preset current interval value and the air pressure difference of the fuel cell to a preset air pressure interval value after closing the tail exhaust valve. The air pressure difference is the pressure difference between the hydrogen path of the fuel cell to discharge hydrogen and the air path of the environment.

[0038] In conjunction with the second aspect, in one implementation, the device further includes:

[0039] The shutdown module is used to close the tail exhaust valve if it is determined that the fuel cell is to be shut down after receiving the emission prohibition signal.

[0040] A third aspect of an embodiment of the present invention provides a gas-liquid mixture emission control system for a fuel cell, the system comprising: a fuel cell, a steam-water separator, a steam-water mixing box, and a tail exhaust valve;

[0041] The fuel cell, the steam-water separator, the steam-water mixing tank and the tail exhaust valve are connected in sequence;

[0042] The steam-water separator is provided with a liquid level sensor for detecting the liquid level in the steam-water separator and triggering a hydrogen discharge operation when the liquid level in the steam-water separator reaches a critical value.

[0043] Compared with the prior art, the gas-liquid mixture emission control method, device, system, equipment and medium of a fuel cell provided in an embodiment of the present invention have the following beneficial effects: when the fuel cell of the present invention generates a gas-liquid mixture during operation, it can respond to the emission prohibition signal to transmit the gas-liquid mixture to the soda-water mixing box for storage and obtain the signal duration and the first liquid level signal value; and call the soda-water mixing box to discharge the gas-liquid mixture generated by the fuel cell according to the control parameters. Emission control through the signal duration and the first liquid level signal value can improve the control accuracy and avoid discharging the gas-liquid mixture in unventilated areas, which can not only improve the emission control efficiency and achieve the zero hydrogen effect, but also reduce the use risk. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1It is a flow chart of a method for controlling gas-liquid mixture emission of a fuel cell provided by one embodiment of the present invention;

[0045] Figure 2 is an operation flow chart of a tail exhaust valve provided by an embodiment of the present invention;

[0046] Figure 3 is an operation flow chart of a method for controlling gas-liquid mixture emission of a fuel cell provided by one embodiment of the present invention;

[0047] Figure 4 It is a structural schematic diagram of a gas-liquid mixture emission control device for a fuel cell provided by one embodiment of the present invention;

[0048] Figure 5 It is a structural schematic diagram of a gas-liquid mixture emission control system of a fuel cell provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] As global environmental problems become increasingly serious, fuel cells, as a clean energy with zero or low emissions, are considered to be one of the important technologies to achieve the goal of carbon neutrality. Since the energy conversion efficiency of fuel cells is much higher than that of traditional engine energy conversion processes, its theoretical energy conversion efficiency can reach more than 80%. This high efficiency gives fuel cells significant advantages in energy utilization and can be applied to automobiles, aircraft, ships, and fixed power sources.

[0051] With the continuous development and application of hydrogen fuel cell technology, hydrogen fuel cells can be used in the field of rail transportation. Since the hydrogen fuel cell system cannot achieve 100% electrochemical reaction efficiency, the fuel cell will discharge a gas-liquid mixture (including ionized water, hydrogen, nitrogen, etc.) under different working conditions. In order to discharge the gas-liquid mixture reasonably and efficiently, the commonly used method is to set a switch valve at one end of the fuel cell. When the fuel cell produces a gas-liquid mixture, the switch valve is controlled to open to discharge the gas-liquid mixture.

[0052] However, the currently commonly used methods have the following technical problems: Since the gas-liquid mixture contains hydrogen, if the gas-liquid mixture is discharged in a closed or differentially ventilated space, hydrogen is likely to accumulate in the closed or differentially ventilated space, and once it encounters an open flame, it is prone to explosion, thus posing a great hidden danger to the application of fuel cells.

[0053] In order to solve the above problems, a method, device, system, equipment and medium for controlling gas-liquid mixture emissions of a fuel cell provided in an embodiment of the present application will be introduced and explained in detail through the following specific embodiments.

[0054] Reference Figure 1 , showing a flow chart of a method for controlling gas-liquid mixture emissions of a fuel cell provided by an embodiment of the present invention.

[0055] In one embodiment, the gas-liquid mixture emission control method of the fuel cell is applicable to an emission controller, and the output end of the fuel cell can be connected to a soda-water mixing box, and the output end of the soda-water mixing box can be provided with a tail discharge valve. The emission controller can be connected to the fuel cell, the soda-water mixing box and the tail discharge valve respectively, detect whether the fuel cell emits a gas-liquid mixture, detect the state of the soda-water mixing box storing the gas-liquid mixture, and control the tail discharge valve to open or close, so as to control the emission of the gas-liquid mixture from the soda-water mixing box.

[0056] Wherein, as an example, the gas-liquid mixture emission control method of the fuel cell may include:

[0057] S11, when the fuel cell generates a gas-liquid mixture during operation, responding to a prohibition emission signal to transmit the gas-liquid mixture to a soda-water mixing tank for storage and obtaining control parameters, wherein the control parameters include: signal duration and a first liquid level signal value;

[0058] In one embodiment, when the fuel cell is running, the fuel cell can directly discharge the gas-liquid mixture generated during the operation into the soda-water mixing tank.

[0059] In the process of discharging the gas-liquid mixture, since the train is in an open area, the gas-liquid mixture can be directly discharged from the soda-water mixing tank. For example, fuel cells are used in rail trains. When the rail train is running on an open track, the fuel cell can discharge the gas-liquid mixture generated during its operation into the soda-water mixing tank, and the gas-liquid mixture in the soda-water mixing tank is directly discharged onto the track through the tail valve. The gas-liquid mixture mainly includes ionized water, hydrogen, nitrogen, etc. Ionized water can evaporate directly on the track, and hydrogen and nitrogen can be discharged into the air.

[0060] During use, if the rail train continues to discharge after entering an unventilated tunnel, hydrogen in the gas-liquid mixture will accumulate. In order to avoid hydrogen accumulation, a discharge prohibition signal triggered by a user can be received and responded to. At this time, the soda-water mixing box can not discharge the gas-liquid mixture, and the gas-liquid mixture can be stored in the soda-water mixing box, and control parameters can be obtained, wherein the control parameters include signal duration and the first liquid level signal value.

[0061] The signal duration may be the total duration of receiving the discharge prohibition signal. The first liquid level signal value may be a feedback signal value according to the real-time liquid level capacity of the soda-water mixing tank after the gas-liquid mixture is discharged into the soda-water mixing tank.

[0062] By collecting control parameters, it can be determined whether to discharge the gas-liquid mixture and the time and frequency of discharging the gas-liquid mixture, or to continue using the soda-water mixing box to store the gas-liquid mixture generated by the fuel cell, thereby avoiding the accumulation of hydrogen in unventilated places and improving the discharge efficiency and effect of the gas-liquid mixture.

[0063] In an optional embodiment, when the fuel cell discharges the gas-liquid mixture generated during operation to the soda-water mixing tank, a signal prohibiting discharge is received. If the tail valve is in a normally open state, the gas-liquid mixture in the soda-water mixing tank will leak, making it difficult to collect hydrogen in the gas-liquid mixture and perform subsequent storage and discharge. In order to avoid leakage of the gas-liquid mixture and allow the fuel cell to operate in a normal state, the following sub-steps may be included, as an example, before the step of obtaining the control parameters:

[0064] S21. After closing the tail exhaust valve, the current value of the fuel cell is adjusted to a preset current interval value and the pressure difference of the fuel cell is adjusted to a preset pressure interval value. The pressure difference is the pressure difference between the hydrogen path of the fuel cell to discharge hydrogen and the air path of the environment.

[0065] In one operation mode, when the fuel cell discharges the gas-liquid mixture generated during operation to a soda-water mixing tank for storage, the tail exhaust valve can be closed to prevent leakage of the gas-liquid mixture in the soda-water mixing tank, thereby allowing the gas-liquid mixture to be discharged into the soda-water mixing tank, which can store the gas-liquid mixture and manage it in a unified manner, and then discharge it when conditions are met.

[0066] A variety of response actions can be performed simultaneously, specifically, the current value of the fuel cell can be adjusted to a preset current interval value and the gas pressure difference of the fuel cell can be adjusted to a preset gas pressure interval value, wherein the gas pressure difference is the pressure difference between the hydrogen path of the fuel cell exhausting hydrogen and the air path of the environment.

[0067] In an operation example, the current value of the fuel cell can be detected. If the current value of the fuel cell is greater than 30A, the current is reduced to 30A. If the current value of the fuel cell is less than or equal to 30A, the current is maintained.

[0068] Similarly, the pressure difference between the gas path and the air path of the fuel cell can be increased to 30 kPa, thereby reducing the penetration of cathode water into the anode.

[0069] In an optional embodiment, when the fuel cell discharges the gas-liquid mixture generated during operation to the soda-water mixing tank for storage, if the user needs to clear the gas-liquid mixture in the soda-water mixing tank and control the fuel cell to shut down at the same time, the gas-liquid mixture in the soda-water mixing tank will not increase. If the control of the gas-liquid mixture discharge is continued, energy consumption will increase. In order to continue to perform the fuel cell shutdown operation, as an example, before the step of obtaining the control parameter, the following sub-steps may be included:

[0070] S31. After receiving the emission prohibition signal, if it is determined that the fuel cell is to be shut down, the tail exhaust valve is closed.

[0071] In actual operation, after receiving the emission prohibition signal input by the user, it is first determined whether the fuel cell is in an operating state. If the fuel cell is in a non-operating state (including shutdown or switching from operation to shutdown), the tail exhaust valve can be controlled to be in a closed state, and there is no need to respond to the emission prohibition signal.

[0072] Similarly, if the fuel cell is in operation, it is determined again whether the fuel cell is in the shutdown process in the operation state. If the fuel cell is in the shutdown process, the tail exhaust valve can be forcibly closed and the shutdown operation can be continued.

[0073] When the tail valve is closed, the gas-liquid mixture can be stored in the soda-water mixing tank to avoid leakage of the gas-liquid mixture.

[0074] S12. Calling the gas-water mixing tank to store or discharge the gas-liquid mixture generated by the fuel cell according to the control parameters.

[0075] Whether the gas-liquid mixture produced by the fuel cell can be discharged can be determined based on the numerical value of the control parameter. If it can be discharged, the gas-liquid mixture stored in the soda-water mixing tank can be discharged. Similarly, if it cannot be discharged while traveling in a tunnel, the soda-water mixing tank can be called to continue storing the gas-liquid mixture produced by the fuel cell, and then discharged after the train leaves the tunnel.

[0076] By using a soda-water mixing box as a cache container to temporarily store the gas-liquid mixture produced by the fuel cell, on the one hand, leakage of the gas-liquid mixture can be avoided; on the other hand, the discharge of the gas-liquid mixture can be reasonably arranged, the discharge efficiency can be improved, and the risk of use can be reduced.

[0077] In order to perform emission control processing according to the control parameters to improve emission efficiency, as an example, calling the soda-water mixing box to store or discharge the gas-liquid mixture generated by the fuel cell according to the control parameters may include the following sub-steps:

[0078] S121. If the signal duration is less than a first preset duration, the tail drain valve is controlled according to the first liquid level signal value, and the gas-liquid mixture generated by the fuel cell in the steam-water mixing tank is discharged.

[0079] In one embodiment, the first preset time length may be the maximum time value for storing the gas-liquid mixture in the soda-water mixing box. If the signal time length is less than the first preset time length, it means that the total time length for receiving the emission prohibition signal is shorter, the time length for prohibiting emission of the gas-liquid mixture is shorter, and the amount of the gas-liquid mixture stored in the soda-water mixing box has not reached the upper limit value.

[0080] When the emission prohibition signal stops and the signal duration has passed, the tail discharge valve can be controlled to be normally open or to be opened and closed at a specific frequency according to the first liquid level signal value, thereby discharging the gas-liquid mixture in the soda-water mixing tank. Since the emission prohibition signal stops after the signal duration has passed, it means that the train is already in an open space and the gas-liquid mixture can be discharged, which can prevent the hydrogen in the gas-liquid mixture from remaining in unventilated places, so that the gas-liquid mixture can be discharged more cleanly, thereby improving the efficiency of the discharge.

[0081] Reference Figure 2 , shows an operation flow chart of the tail exhaust valve provided by one embodiment of the present invention.

[0082] In an optional embodiment, in order to control the activity of the tail drain valve according to the first liquid level signal value to improve the efficiency of discharge, as an example, controlling the activity of the tail drain valve according to the first liquid level signal value may include the following sub-steps:

[0083] S1211. If the first liquid level signal value is equal to a first preset value, the tail valve is controlled to open and close according to a preset first activity duration and a preset first activity frequency.

[0084] S1212: If the first liquid level signal value is equal to a second preset value, control the tail exhaust valve to be normally open.

[0085] In one operation mode, the first liquid level signal value may be a Boolean value fed back by the liquid level sensor, and the first liquid level signal value may be 0 or 1. The first preset value may be 0, and the second preset value may be 1.

[0086] Specifically, if the first liquid level signal value is equal to the first preset value (for example, 0), the tail drain valve can be controlled to perform an opening and closing activity according to the preset first activity duration and the preset first activity frequency. For example, the tail drain valve can be opened at a high frequency, opened once every 1 second, opened for 1 second each time, and lasted for 10 seconds to discharge the liquid in the soda-water mixing tank until the drainage operation is completed.

[0087] Similarly, if the first liquid level signal value is equal to the second preset value (eg, 1), the tail valve can be controlled to be normally open until the first liquid level signal value changes from the second preset value to the first preset value.

[0088] In an optional embodiment, during the process of the tail valve being normally open, the liquid in the soda-water mixing tank gradually decreases, and the detected first liquid level signal value may change. When the first liquid level signal value changes from the second preset value to the first preset value, after the step of controlling the tail valve to be normally open, the method may further include the following sub-steps:

[0089] S1213. Obtain a second liquid level signal value, where the second liquid level signal value is a feedback signal value based on a real-time liquid level capacity of the soda-water mixing tank when the soda-water mixing tank discharges a gas-liquid mixture.

[0090] S1214. If the second liquid level signal value is equal to the first preset value, the tail exhaust valve is controlled to perform opening and closing activities according to a preset second activity duration and a preset second activity frequency.

[0091] Specifically, after the step of controlling the tail exhaust valve to be normally open, a second liquid level signal value can be obtained, which is a feedback signal value based on the real-time liquid level capacity of the soda-water mixing tank when the soda-water mixing tank discharges the gas-liquid mixture.

[0092] If the second liquid level signal value is equal to the first preset value, the tail valve is controlled to perform opening and closing activities according to the preset second activity duration and the preset second activity frequency.

[0093] In actual operation, the tail drain valve can also be opened at a high frequency, opening it once every 1 second, each time for 1 second, and continuously for 10 seconds to discharge the liquid in the soda-water mixing tank until the drainage operation is completed.

[0094] S122. If the signal duration is greater than the first preset duration or the signal duration is greater than the second preset duration and the signal value of the first liquid level signal is equal to the second preset value, the tail drain valve is closed to allow the gas-liquid mixture generated by the fuel cell in the gas-water mixing tank to be discharged, and the fuel cell is controlled to switch from the running state to the shutdown state, wherein the first preset duration is greater than the second preset duration.

[0095] Similarly, if the signal duration is longer than the first preset duration, it means that the emission prohibition signal is long, the fuel cell discharges the gas-liquid mixture to the soda-water mixing tank for a long time, and the amount of gas-liquid mixture stored in the soda-water mixing tank may have reached the upper limit. The soda-water mixing tank may no longer be able to receive the gas-liquid mixture discharged by the fuel cell. Closing the tail exhaust valve can also control the fuel cell to switch from the operating state to the shutdown state, so that the fuel cell does not produce a gas-liquid mixture.

[0096] Similarly, if the signal duration is greater than the second preset duration and the signal value of the first liquid level signal is equal to the second preset value, it may also mean that the amount of gas-liquid mixture stored in the soda-water mixing tank may have reached the upper limit, and the soda-water mixing tank can no longer receive the gas-liquid mixture discharged by the fuel cell. The tail exhaust valve can also be closed and the fuel cell can be controlled to switch from the running state to the shutdown state.

[0097] For example, if the emission prohibition signal does not disappear during the process of obtaining the control parameters, it is determined whether the signal duration is greater than a first preset duration (for example, 3 minutes). If it is greater than 3 minutes, the tail exhaust valve is forcibly closed to control the fuel cell to perform a shutdown operation.

[0098] Similarly, if the signal duration is less than the first preset duration, but the signal value of the first liquid level signal is equal to the second preset value and the signal duration is greater than the second preset duration (e.g. 30s), the tail valve can be forcibly closed and the fuel cell can be controlled to shut down. If the signal duration is less than 30s, the process returns to the determination of whether the emission prohibition signal disappears. If the emission prohibition signal disappears, the tail valve can be controlled to be normally open, and the following operations can be performed: Figure 2 until the hydrogen is exhausted.

[0099] Reference Figure 3 , shows an operation flow chart of a gas-liquid mixture emission control method for a fuel cell provided by an embodiment of the present invention.

[0100] Specifically, the operation of the gas-liquid mixture emission control method of the fuel cell may include the following steps:

[0101] The first step is to determine whether a zero hydrogen signal (specifically a signal prohibiting hydrogen emission) is received. If a zero hydrogen signal is received, it can be determined whether the fuel cell is in operation. If it is not in operation, it is not necessary to respond to the zero hydrogen signal.

[0102] In the second step, if the fuel cell is in operation, it can be determined whether the fuel cell is in the shutdown process. If it is in the shutdown process, the tail exhaust valve can be closed and then a normal shutdown can be performed.

[0103] The third step is to close the tail valve if the system is not in the shutdown process, reduce the current of the fuel cell to 30A and increase the pressure difference between the hydrogen and air paths of the fuel cell to 30kPa.

[0104] The fourth step is to obtain the statistical duration of the zero hydrogen signal. If the zero hydrogen signal disappears during the statistical duration of the zero hydrogen signal, a drainage operation can be performed to control the tail drain valve to open and discharge the hydrogen.

[0105] In the fifth step, if the zero hydrogen signal does not disappear when counting the duration of the zero hydrogen signal, but the signal duration is greater than the first preset duration, the tail exhaust valve can be closed.

[0106] Step 6. If the zero hydrogen signal does not disappear when counting the duration of the zero hydrogen signal, the signal duration is less than the first preset duration, but the signal value of the first liquid level signal is equal to the second preset value and the signal duration is greater than the second preset duration, the tail drain valve can also be closed.

[0107] The present invention has stronger feasibility, and through preliminary design and control strategies, it is ensured that the system can meet the customer's minimum power requirements during the zero-hydrogen process, and can ensure the normal operation of the fuel cell. In abnormal circumstances, zero hydrogen is also the highest priority. It has completely zero hydrogen and tail gas emission characteristics, which makes the applicable working conditions wider and the safety higher, enriching the use cases of fuel cells in rail transit.

[0108] In this embodiment, the embodiment of the present invention provides a method for controlling the emission of a gas-liquid mixture of a fuel cell, and its beneficial effect is that when the fuel cell of the present invention generates a gas-liquid mixture during operation, it can respond to a prohibition emission signal to transmit the gas-liquid mixture to a soda-water mixing box for storage and obtain the signal duration and the first liquid level signal value; the soda-water mixing box is called according to the control parameters to discharge the gas-liquid mixture generated by the fuel cell. Emission control through the signal duration and the first liquid level signal value can improve the control accuracy and avoid discharging the gas-liquid mixture in an unventilated area, which can not only improve the emission control efficiency and achieve the zero hydrogen effect, but also reduce the use risk.

[0109] The present invention also provides a fuel cell gas-liquid mixture emission control device, see Figure 4 , showing a schematic structural diagram of a gas-liquid mixture emission control device for a fuel cell provided by an embodiment of the present invention.

[0110] The output end of the fuel cell is connected to a gas-water mixing box provided with a tail exhaust valve, wherein, as an example, the gas-liquid mixture emission control device of the fuel cell may include:

[0111] The parameter acquisition module 401 is used to transmit the gas-liquid mixture to the gas-water mixing tank for storage and acquire control parameters in response to the emission prohibition signal when the fuel cell generates the gas-liquid mixture during operation, wherein the control parameters include: signal duration and the first liquid level signal value;

[0112] A discharge control module 402, for calling the gas-water mixing box to discharge the gas-liquid mixture generated by the fuel cell according to the control parameters;

[0113] Among them, the signal duration is the total duration of continuously receiving the hydrogen emission signal, and the first liquid level signal value is the feedback signal value based on the real-time liquid level capacity of the soda-water mixing tank when the gas-liquid mixture emission of the fuel cell is controlled to the soda-water mixing tank.

[0114] Optionally, the emission control module is further used to:

[0115] If the signal duration is less than the first preset duration, the tail valve is controlled to move according to the first liquid level signal value, and the gas-liquid mixture generated by the fuel cell in the steam-water mixing tank is discharged;

[0116] If the signal duration is greater than the first preset duration or the signal duration is greater than the second preset duration and the signal value of the first liquid level signal is equal to the second preset value, the tail drain valve is closed to allow the gas-liquid mixture generated by the fuel cell in the soda-water mixing tank to be discharged, and the fuel cell is controlled to switch from the running state to the shutdown state, wherein the first preset duration is greater than the second preset duration.

[0117] Optionally, the emission control module is further used to:

[0118] If the first liquid level signal value is equal to a first preset value, the tail valve is controlled to perform an opening and closing activity according to a preset first activity duration and a preset first activity frequency;

[0119] If the first liquid level signal value is equal to the second preset value, the tail exhaust valve is controlled to be normally open.

[0120] Optionally, the emission control module is further used to:

[0121] Acquire a second liquid level signal value, where the second liquid level signal value is a feedback signal value according to a real-time liquid level capacity of the soda-water mixing tank when the soda-water mixing tank discharges a gas-liquid mixture;

[0122] If the second liquid level signal value is equal to the first preset value, the tail exhaust valve is controlled to perform opening and closing activities according to the preset second activity duration and the preset second activity frequency.

[0123] Optionally, the device further comprises:

[0124] The current and air pressure adjustment module is used to adjust the current value of the fuel cell to a preset current interval value and the air pressure difference of the fuel cell to a preset air pressure interval value after closing the tail exhaust valve. The air pressure difference is the pressure difference between the hydrogen path of the fuel cell to discharge hydrogen and the air path of the environment.

[0125] Optionally, the device further comprises:

[0126] The shutdown module is used to close the tail exhaust valve if it is determined that the fuel cell is to be shut down after receiving the emission prohibition signal.

[0127] The present invention also provides a fuel cell gas-liquid mixture emission control system, see Figure 5, showing a schematic structural diagram of a gas-liquid mixture emission control system for a fuel cell provided by an embodiment of the present invention.

[0128] The system is applicable to the gas-liquid mixture emission control method of the fuel cell as described above, wherein, as an example, the gas-liquid mixture emission control system of the fuel cell may include: a fuel cell, a steam-water separator, a steam-water mixing box, and a tail exhaust valve;

[0129] The fuel cell, the steam-water separator, the steam-water mixing tank and the tail exhaust valve are connected in sequence;

[0130] The soda-water mixing tank is provided with a liquid level sensor for detecting the liquid level in the soda-water mixing tank and triggering the discharge operation of the gas-liquid mixture when the liquid level in the soda-water mixing tank reaches a critical value.

[0131] Specifically, according to the short-term zero hydrogen emission (prohibiting emission of gas-liquid mixture) functional requirements, the gas-liquid mixture emission control system of the fuel cell can meet the requirement that the water and exhaust gas generated in the system cannot be discharged within time T after receiving the tunnel zero hydrogen signal sent by the whole vehicle.

[0132] To further reduce hydrogen emissions, the hydrogen in the gas-liquid mixture can be separated by a steam-water separator and returned to the fuel cell for processing, and the remaining nitrogen and ionized water can be discharged to the steam-water mixing tank for temporary storage.

[0133] It should be noted that in order to prevent the liquid inside the soda-water mixing tank from overflowing, a liquid level sensor is installed at two-thirds of the soda-water mixing tank to warn the tank liquid level.

[0134] At the same time, when designing the size of the soda mixing box, you can focus on calculating the parameters of the soda mixing box. At the same time, there are two main calculation parameters for the soda mixing box: first, the volume of the box; second, the pressure it can withstand.

[0135] Among them, the volume calculation steps of the soda mixing tank are as follows:

[0136] First, calculate the total volume flow of water generated by the system, the calculation formula is as follows:

[0137] Q Total =0.0056*I*N

[0138] Where Q Total is the cathode water production per unit time of the system (ml / s), I is the system current (A) during the zero hydrogen emission process. This parameter needs to be confirmed with the customer to ensure that the power output during the zero hydrogen process can meet the customer's minimum power requirements, and N is the total number of system stacks.

[0139] It should be noted that the water production per unit time here refers to the amount of water (including the total amount of gas and liquid) generated by the system on the cathode side (air side). When the fuel cell stack is in operation, water will be generated on the cathode side. The water will have several destinations. One is to be discharged through the cathode outlet in the form of a gas-liquid mixture, the second is to return to the cathode inlet through the humidifier, and finally to penetrate into the anode (hydrogen side) through the proton exchange membrane. After this part of water is accumulated, it needs to be discharged through the tail outlet on the anode hydrogen side.

[0140] Second, assuming that the diffusion coefficient of the water generated by the system from the cathode to the anode is K, the volume flow rate of the anode water in the system is:

[0141] Q H2 =K*Q Total

[0142] In the above formula, Q H2 It is the water production per unit time of the anode of the system (ml / s), that is, the amount of water accumulated in the soda-water mixing tank per unit time.

[0143] Third, in order to ensure that the system does not trigger the alarm of the liquid level sensor in the soda-water mixing tank when the zero hydrogen signal is effective, the position of the liquid level sensor should be considered and a certain margin should be reserved when designing the volume of the soda-water mixing tank. The volume calculation formula is:

[0144]

[0145] Where V is the volume of the soda mixing tank, V Y is the volume margin, which can be calculated based on the reserved time T Y Calculated according to the following formula:

[0146] V Y =Q H2 *T Y

[0147] About the water tank's pressure resistance:

[0148] The minimum pressure that the soda-water mixing tank should withstand should be the maximum anode pressure of the system, so the actual pressure that the tank should withstand should be:

[0149] P=P H2_Max +P Y

[0150] Where, P is the minimum pressure of the soda-water mixing tank, P H2_Max is the maximum anode pressure of the system, P Y is the pressure margin, which is used to ensure the normal operation of the soda-water mixing tank. Y Can be estimated based on experience.

[0151] When designing the water tank, adjustments can be made based on the above parameters.

[0152] Those skilled in the art can clearly understand that, for the sake of convenience and brevity of description, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0153] Furthermore, an embodiment of the present application also provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the gas-liquid mixture emission control method for a fuel cell as described in the above embodiment is implemented.

[0154] Furthermore, an embodiment of the present application also provides a computer-readable storage medium, which stores a computer-executable program, and the computer-executable program is used to enable a computer to execute the gas-liquid mixture emission control method of a fuel cell as described in the above embodiment.

[0155] It should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. When an element such as a layer, region or substrate is referred to as being "on" or "above" another element, it can be directly on the other element, or there can also be an intermediate element. On the contrary, when an element is referred to as "directly on" or "above" another element, there is no intermediate element. It should also be understood that when an element is referred to as being "under" or "below" another element, it can be directly under or below the other element, or there can also be an intermediate element. On the contrary, when an element is referred to as being "directly under" or "below" another element, there is no intermediate element. Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0156] Those skilled in the art will appreciate that the embodiments of the present application may also provide computer program products. Therefore, the present application may adopt the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the present application may adopt the form of computer program products implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program codes.

[0157] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), apparatuses, and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0158] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0159] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0160] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for controlling gas-liquid mixture emissions of a fuel cell, characterized in that: The output end of the fuel cell is connected to a steam-water mixing box provided with a tail exhaust valve, and the method comprises: When the fuel cell generates a gas-liquid mixture during operation, the gas-liquid mixture is transmitted to the soda-water mixing tank for storage in response to the emission prohibition signal and control parameters are obtained, wherein the control parameters include: signal duration and a first liquid level signal value; calling the gas-water mixing box to discharge the gas-liquid mixture generated by the fuel cell according to the control parameters; Among them, the signal duration is the total duration of receiving the discharge prohibition signal, and the first liquid level signal value is the feedback signal value based on the real-time liquid level capacity of the soda-water mixing tank after the gas-liquid mixture is discharged into the soda-water mixing tank.

2. The method for controlling gas-liquid mixture emission of a fuel cell according to claim 1, characterized in that: The step of calling the gas-water mixing box to discharge the gas-liquid mixture generated by the fuel cell according to the control parameter comprises: If the signal duration is less than the first preset duration, the tail valve is controlled to move according to the first liquid level signal value, and the gas-liquid mixture generated by the fuel cell in the steam-water mixing tank is discharged; If the signal duration is greater than the first preset duration or the signal duration is greater than the second preset duration and the signal value of the first liquid level signal is equal to the second preset value, the tail drain valve is closed to allow the gas-liquid mixture generated by the fuel cell in the soda-water mixing tank to be discharged, and the fuel cell is controlled to switch from the running state to the shutdown state, wherein the first preset duration is greater than the second preset duration.

3. The method for controlling gas-liquid mixture emission of a fuel cell according to claim 2, characterized in that: The step of controlling the tail valve activity according to the first liquid level signal value comprises: If the first liquid level signal value is equal to a first preset value, the tail valve is controlled to perform an opening and closing activity according to a preset first activity duration and a preset first activity frequency; If the first liquid level signal value is equal to the second preset value, the tail exhaust valve is controlled to be normally open.

4. The method for controlling gas-liquid mixture emission of a fuel cell according to claim 3, characterized in that: After the step of controlling the tail exhaust valve to be normally open, the method further includes: Acquire a second liquid level signal value, where the second liquid level signal value is a feedback signal value according to a real-time liquid level capacity of the soda-water mixing tank when the soda-water mixing tank discharges a gas-liquid mixture; If the second liquid level signal value is equal to the first preset value, the tail exhaust valve is controlled to perform opening and closing activities according to the preset second activity duration and the preset second activity frequency.

5. The method for controlling gas-liquid mixture emission of a fuel cell according to claim 1, characterized in that: Before the step of obtaining the control parameters, the method further includes: After closing the tail exhaust valve, the current value of the fuel cell is adjusted to a preset current interval value and the pressure difference of the fuel cell is adjusted to a preset pressure interval value. The pressure difference is the pressure difference between the hydrogen path of the fuel cell exhausting hydrogen and the air path of the environment.

6. The method for controlling gas-liquid mixture emission of a fuel cell according to claim 1, characterized in that: Before the step of obtaining the control parameters, the method further includes: After receiving the emission prohibition signal, if it is determined that the fuel cell is to be shut down, the tail exhaust valve is closed.

7. A gas-liquid mixture emission control device for a fuel cell, characterized in that: The device comprises: A parameter acquisition module is used for transmitting the gas-liquid mixture to a gas-water mixing tank for storage and acquiring control parameters in response to a discharge prohibition signal when the fuel cell generates a gas-liquid mixture during operation, wherein the control parameters include: signal duration and a first liquid level signal value; A discharge control module, used for calling the gas-water mixing box to discharge the gas-liquid mixture generated by the fuel cell according to the control parameters; Among them, the signal duration is the total duration of continuously receiving the hydrogen emission signal, and the first liquid level signal value is the feedback signal value based on the real-time liquid level capacity of the soda-water mixing tank when the gas-liquid mixture emission of the fuel cell is controlled to the soda-water mixing tank.

8. A gas-liquid mixture emission control system for a fuel cell, characterized in that: The system is applicable to the gas-liquid mixture emission control method of the fuel cell according to any one of claims 1 to 6, and the system comprises: a fuel cell, a steam-water separator, a steam-water mixing box, and a tail exhaust valve; The fuel cell, the steam-water separator, the steam-water mixing tank and the tail exhaust valve are connected in sequence; The soda-water mixing tank is provided with a liquid level sensor for detecting the liquid level in the soda-water mixing tank and triggering the discharge operation of the gas-liquid mixture when the liquid level in the soda-water mixing tank reaches a critical value.

9. An electronic device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the gas-liquid mixture emission control method for a fuel cell as described in any one of claims 1 to 6 when executing the computer program.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer-executable program, and the computer-executable program is used to enable a computer to execute the gas-liquid mixture emission control method for a fuel cell as described in any one of claims 1-6.

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