CN114243058B - Fuel cell system, gas-liquid separation device, control method and control device thereof - Google Patents
Fuel cell system, gas-liquid separation device, control method and control device thereof Download PDFInfo
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- CN114243058B CN114243058B CN202111311419.5A CN202111311419A CN114243058B CN 114243058 B CN114243058 B CN 114243058B CN 202111311419 A CN202111311419 A CN 202111311419A CN 114243058 B CN114243058 B CN 114243058B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
- H01M8/04119—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
- H01M8/04156—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying with product water removal
- H01M8/04164—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying with product water removal by condensers, gas-liquid separators or filters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/70—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by fuel cells
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/30—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/0444—Concentration; Density
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/0444—Concentration; Density
- H01M8/04447—Concentration; Density of anode reactants at the inlet or inside the fuel cell
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2250/00—Fuel cells for particular applications; Specific features of fuel cell system
- H01M2250/20—Fuel cells in motive systems, e.g. vehicle, ship, plane
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells
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- Engineering & Computer Science (AREA)
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- Manufacturing & Machinery (AREA)
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- General Chemical & Material Sciences (AREA)
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- Mechanical Engineering (AREA)
- Fuel Cell (AREA)
Abstract
The embodiment of the invention provides a fuel cell system, a gas-liquid separation device, a control method and a control device thereof, wherein a tank body of the gas-liquid separation device comprises a liquid storage cavity and a monitoring cavity, and a vent hole and a liquid through hole are arranged between the liquid storage cavity and the monitoring cavity, so that the liquid level in the liquid storage cavity and the liquid level in the monitoring cavity change slowly. Because first level sensor and second level sensor set up in the different liquid level positions of monitoring cavity, when the jar body receives factor such as jolt, acceleration, speed reduction or slope change and influences, the liquid level in monitoring cavity and the stock solution cavity can not produce great fluctuation, therefore, reduced first level sensor and second level sensor and produced wrong liquid level signal's condition, improved first level sensor and second level sensor and detected the accuracy of liquid level, and then, can control the flowing back or the exhaust process of jar body more accurately through the controller.
Description
Technical Field
The present invention relates to the technical field of fuel cells, and in particular, to a fuel cell system, a gas-liquid separation device, a control method, and a control device thereof.
Background
In the operation process of the fuel cell, as the proton exchange membrane has excellent water conduction characteristics, part of water generated by the cathode migrates to the anode through water permeation of the proton exchange membrane and the like, and part of water permeated to the anode humidifies anode reaction gas, the rate of electrochemical reaction can be improved, but excessive water can cause flooding of the membrane electrode, increase mass transfer resistance in the electric pile, influence the transmission rate of the reaction gas, and reduce the output performance and service life of the electric pile.
Therefore, the redundant water in the fuel cell needs to be removed to ensure that the water content of the hydrogen is suitable during the re-reaction, and water flooding is avoided.
At present, the prior art discharges the liquid generated by the fuel cell by opening the drain valve for a certain period of time in a certain period, but in actual operation, it is difficult to accurately control the opening and closing of the drain valve as the actual environmental temperature, pressure, etc. vary. In addition, during the running of the vehicle, the sensor detects inaccurate water level data due to the road gradient change and jolt, and further, the control accuracy of the drain valve is lowered.
In addition, in the prior art, the common drainage process is accompanied by the situation of hydrogen discharge, so that the utilization rate of hydrogen is reduced, and potential safety hazards are also caused.
Disclosure of Invention
The embodiment of the invention solves the technical problem of lower accuracy when controlling the gas-liquid separation device to discharge liquid or gas in the related technology by providing the fuel cell system, the gas-liquid separation device, the control method and the control device thereof.
In a first aspect, the present invention provides a gas-liquid separation apparatus, applied to a fuel cell system including a controller, the gas-liquid separation apparatus including: the tank body comprises a liquid storage cavity and a monitoring cavity, and a vent hole and a liquid through hole are arranged between the liquid storage cavity and the monitoring cavity; the first liquid level sensor and the second liquid level sensor are arranged at different liquid level positions of the monitoring cavity; the first liquid level sensor and the second liquid level sensor are electrically connected with the controller; the controller is used for controlling the liquid discharging or exhausting process of the tank body according to the liquid level signals of the first liquid level sensor and the second liquid level sensor.
Preferably, the gas-liquid separation device further comprises: the floating baffle is arranged in the monitoring cavity and is positioned between the first liquid level sensor and the second liquid level sensor; the floating baffle comprises: an upper floating plate, a hollow plate and a lower floating plate which are sequentially stacked; a first through hole is formed in the thickness direction of the upper floating plate, and a second through hole is formed in the thickness direction of the lower floating plate; the first through holes and the second through holes are opposite to the hollow area of the hollow plate, and the first through holes and the second through holes are arranged in a staggered mode.
Preferably, the tank is further provided with: the discharge valve is electrically connected with the controller; the controller is specifically configured to: and controlling the opening and closing states of the discharge valve according to the liquid level signals of the first liquid level sensor and the second liquid level sensor.
Preferably, the discharge valve is arranged at the bottom of the tank body; the first liquid level sensor is arranged at a first liquid level position of the side wall of the monitoring cavity; the first liquid level position is determined according to a first preset angle constant and the distance between the discharge valve and the side wall of the monitoring cavity.
Preferably, the tank is further provided with: the collecting port is formed in the top of the tank body; the second liquid level sensor is arranged at a second liquid level position of the side wall of the monitoring cavity; the second liquid level position is determined according to a second preset angle constant and the distance between the collecting port and the side wall of the monitoring cavity.
In a second aspect, the present invention provides, by an embodiment of the present invention, a fuel cell system including a controller, a fuel cell, a gas supply device, and the gas-liquid separation device of any one of the first aspects; the gas-liquid separation device is connected with the discharge port of the fuel cell and is used for receiving liquid and gas discharged by the fuel cell; the controller is electrically connected with the fuel cell and the gas-liquid separation device; the gas supply device is used for supplying gas required for operation to the fuel cell.
In a third aspect, the present invention provides, by an embodiment of the present invention, a fuel cell system control method applied to the fuel cell system described in the second aspect, the control method including: if the fuel cell is detected to be in the running state, acquiring the concentration of target gas entering the gas-liquid separation device; when the concentration of the target gas reaches a preset concentration threshold value, controlling the working state of the gas-liquid separation device according to the liquid level signals of the first liquid level sensor and the second liquid level sensor; otherwise, controlling the gas-liquid separation device to be in a discharge state, and controlling the gas-liquid separation device to stop discharging until the concentration of the target gas reaches the preset concentration threshold value.
Preferably, the controlling the working state of the gas-liquid separation device according to the liquid level signals of the first liquid level sensor and the second liquid level sensor includes: if the liquid level signal of the first liquid level sensor is detected, controlling the gas-liquid separation device to be in a discharge state so as to discharge the liquid in the tank body; and controlling the gas-liquid separation device to stop discharging until the liquid level signal of the second liquid level sensor is detected to disappear, so as to stop discharging the liquid in the tank body.
Preferably, the method further comprises: and if the fuel cell is detected to be in the shutdown purging state, controlling the gas-liquid separation device to be in the discharging state, and controlling the gas-liquid separation device to stop discharging until the fuel cell system is detected not to be in the shutdown purging mode.
In a fourth aspect, the present invention provides, by an embodiment of the present invention, a fuel cell system control apparatus applied to the fuel cell system described in the second aspect, the control apparatus being configured to: when the fuel cell is detected to be in an operating state, acquiring the concentration of target gas entering the gas-liquid separation device; when the concentration of the target gas reaches a preset concentration threshold value, controlling the working state of the gas-liquid separation device according to the liquid level signals of the first liquid level sensor and the second liquid level sensor; otherwise, controlling the gas-liquid separation device to be in a discharge state, and controlling the gas-liquid separation device to stop discharging until the concentration of the target gas reaches the preset concentration threshold value.
One or more technical solutions provided in the embodiments of the present invention at least have the following technical effects or advantages:
the gas-liquid separation device provided by the embodiment of the invention comprises: the device comprises a tank body, a floating baffle, a first liquid level sensor and a second liquid level sensor. Because the tank body comprises a liquid storage cavity and a monitoring cavity, and the vent hole and the liquid through hole are arranged between the liquid storage cavity and the monitoring cavity, the liquid level in the liquid storage cavity and the liquid level in the monitoring cavity change slowly. Because first level sensor and second level sensor set up in the different liquid level positions of monitoring cavity, when the jar body receives factors such as jolt, acceleration, speed reduction or slope change and influences, the liquid level in monitoring cavity and the stock solution cavity can not produce great fluctuation, therefore, reduced first level sensor and second level sensor and produced the condition of wrong liquid level signal, improved first level sensor and second level sensor's accuracy of detecting the liquid level.
Furthermore, the first liquid level sensor and the second liquid level sensor are electrically connected with the controller, and the controller can control the liquid discharging or exhausting process of the tank body more accurately according to the liquid level signals of the first liquid level sensor and the second liquid level sensor.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a gas-liquid separation device according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of the floating baffle structure of FIG. 1;
FIG. 3 is a schematic diagram of a gas-liquid separation device according to an embodiment of the present invention;
FIG. 4 is a schematic view of a gas-liquid separation device according to another embodiment of the present invention;
fig. 5 is a schematic view showing the structure of a fuel cell system according to an embodiment of the present invention;
fig. 6 is a flowchart of a control method of a fuel cell system in an embodiment of the invention.
Detailed Description
The embodiment of the invention solves the technical problem of lower accuracy when controlling the gas-liquid separation device to discharge liquid or gas in the related technology by providing the fuel cell system, the gas-liquid separation device, the control method and the control device thereof.
The technical scheme provided by the embodiment of the invention aims to solve the technical problems, and the overall thought is as follows:
through set up air vent and logical liquid hole between stock solution cavity and monitoring cavity for liquid level in the stock solution cavity and the liquid level in the monitoring cavity change slowly, through setting up first level sensor and second level sensor in the different liquid level positions of monitoring cavity, even the jar body receives factor influences such as jolt, acceleration, speed reduction or slope change, the liquid level in monitoring cavity and the stock solution cavity also can not produce great fluctuation, first level sensor and second level sensor just also are difficult to produce wrong liquid level signal, have improved the accuracy that first level sensor and second level sensor detected the liquid level.
Therefore, through the electric connection of the first liquid level sensor and the second liquid level sensor and the controller, the controller can control the liquid discharging or exhausting process of the tank body more accurately according to the liquid level signals of the first liquid level sensor and the second liquid level sensor.
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
First, the term "and/or" appearing herein is merely an association relationship describing associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be capable of operation in sequences other than those illustrated or otherwise described.
In a first aspect, the present invention provides a gas-liquid separation apparatus, which is applied to a fuel cell system, where the fuel cell system includes a controller, and in a specific implementation process, the controller may be an FCCU (Fuel Cell Control Unit, a fuel cell system control unit), or may be an electronic device with a control function, such as a fuel cell system controller.
Referring to fig. 1, the gas-liquid separation apparatus may include: the tank 100, the floating baffle 200, the first liquid level sensor 300, and the second liquid level sensor 400. Specifically, the tank body 100 includes a liquid storage cavity 101 and a monitoring cavity 102, and a vent hole 103 and a liquid through hole 104 are arranged between the liquid storage cavity 101 and the monitoring cavity 102. The first liquid level sensor 300 and the second liquid level sensor 400 are disposed at different liquid level positions of the monitoring cavity 102. The floating baffle 200 is disposed within the monitoring cavity 102 and between the first level sensor 300 and the second level sensor 400. The first liquid level sensor 300 and the second liquid level sensor 400 are both electrically connected to the controller 500.
Since the vent hole 103 and the liquid through hole 104 can make the liquid level in the liquid storage cavity 101 consistent with the liquid level in the monitoring cavity 102, the liquid level in the liquid storage cavity 101 can be monitored by detecting the liquid level in the monitoring cavity 102, and in addition, since the liquid level area in the monitoring cavity 102 is smaller than the total liquid level area of the tank body 100, the fluctuation of the liquid level in the monitoring cavity 102 is smaller. Because the floating baffle 200 is disposed in the monitoring cavity 102, the floating baffle 200 can attenuate the fluctuation of the liquid level in the monitoring cavity 102 by floating on the liquid level in the monitoring cavity 102.
Based on the technical features, the liquid level in the monitoring cavity 102 cannot generate larger fluctuation due to factors such as jolt, acceleration, deceleration or gradient change, so that the situation that the first liquid level sensor 300 and the second liquid level sensor 400 generate error liquid level signals is reduced, and the accuracy of detecting the liquid level by the first liquid level sensor 300 and the second liquid level sensor 400 is improved.
Further, when the controller 500 controls the drain or drain process of the tank 100 based on the liquid level signals of the first liquid level sensor 300 and the second liquid level sensor 400, the drain or drain process of the tank 100 can be more accurately controlled.
In the implementation process, referring to fig. 1, the isolation baffle 105 may be disposed inside the tank 100 to isolate the entire tank 100 into two parts, namely, the liquid storage cavity 101 and the monitoring cavity 102. As is known from the general knowledge of fluid, the smaller the liquid surface area, the smaller the fluctuation of the liquid surface, and in order to reduce the fluctuation of the liquid surface in the monitoring chamber 102, the volume of the liquid storage chamber 101 may be set larger than the volume of the monitoring chamber 102, so that the fluctuation of the liquid surface in the monitoring chamber 102 is smaller than the fluctuation of the liquid surface in the liquid storage chamber 101.
In order to make the liquid level in the liquid storage chamber 101 coincide with the liquid level in the monitoring chamber 102, it is necessary to make the air pressure in the liquid storage chamber 101 coincide with the air pressure in the monitoring chamber 102, and the liquid pressure in the liquid storage chamber 101 coincides with the liquid pressure in the monitoring chamber 102. In the implementation process, the isolation baffle 105 may be provided with a vent hole 103 and a liquid through hole 104, and specifically, the vent hole 103 may be disposed in a top area of the isolation baffle 105; the liquid passage holes 104 may be provided in the bottom region of the isolation barrier 105.
It should be noted that one or more ventilation holes 103 may be provided to ensure that the air pressure in the liquid storage cavity 101 is consistent with the air pressure in the monitoring cavity 102; one or more fluid ports 104 may be provided to ensure that the fluid pressure in the fluid reservoir 101 is consistent with the fluid pressure in the monitoring chamber 102. Thus, even if the gas-liquid separation device is affected by external factors to cause fluctuation of liquid levels in the liquid storage cavity 101 and the monitoring cavity 102, the liquid passing through the liquid passing hole 104 is hindered by the liquid passing hole 104, the liquid passing hole 104 plays a role in damping vibration, so that the amplitude of water waves in the liquid storage cavity 101 and the monitoring cavity 102 is weakened, and the corresponding fluctuation of the liquid level is also greatly weakened.
Specifically, referring to fig. 2, the floating baffle 200 may include: an upper floating plate 201, a hollow plate 202, and a lower floating plate 203, which are stacked in this order; a first through hole 2011 is provided along the thickness direction of the upper floating plate 201, and a second through hole 2031 is provided along the thickness direction of the lower floating plate 203; the first through hole 2011 and the second through hole 2031 are opposite to the hollow area 2021 of the hollow plate 202, and the first through hole 2011 and the second through hole 2031 are offset from each other.
It should be noted that, since the floating baffle 200 may float on the liquid surface of the monitoring cavity 102, and the profile of the floating baffle 200 may be identical to the profile of the inner wall of the monitoring cavity 102, such that the floating baffle 200 can only float in a direction perpendicular to the inner wall of the monitoring cavity 102. When the liquid level fluctuates, the liquid cannot directly pass through the first through hole 2011 and the second through hole 2031, and a part of the fluctuation energy is absorbed by the floating baffle 200, so that the fluctuation of the liquid level of the monitoring cavity 102 is weakened.
For the floating baffle 200, in the implementation process, the number of stacked floating baffles 200 may be greater than 3, and the greater the number of stacked floating baffles 200, the better the blocking effect on the liquid level fluctuation. Any one of the upper floating plate 201, the hollow plate 202 and the lower floating plate 203 may be further added to the upper floating plate 201 and/or the lower floating plate 203. Of course, the floating baffle 200 may also include a plurality of upper floating plates 201, hollow plates 202, and lower floating plates 203 stacked in this order.
In the implementation process, the density of the floating baffle 200 can also be controlled, when the floating baffle 200 floats on the liquid level of the monitoring cavity 102, the liquid level can be ensured to be positioned in the middle of the hollow plate 202 of the floating baffle 200, so that when the water surface shakes, the floating baffle 200 swings up and down under the dual actions of inertia and water viscosity, and the fluctuation of the liquid level can be further weakened.
For the can 100, referring specifically to fig. 1, the can 100 may further be provided with: the discharge valve 106, and may electrically connect the discharge valve 106 with the controller 500. The controller 500 is specifically configured to: the open/close state of the drain valve 106 is controlled according to the liquid level signals of the first liquid level sensor 300 and the second liquid level sensor 400.
Specifically, the drain valve 106 may be disposed at the bottom of the tank body 100, for example, at the bottom of the liquid storage cavity 101, or at the bottom end of the inner wall of the liquid storage cavity 101; the first level sensor 300 may be disposed at a first level location of the sidewall of the monitoring cavity 102.
Specifically, referring to fig. 1, the can body 100 may further be provided with: a collection port 107, and the collection port 107 may be opened at the top of the can 100; the second level sensor 400 may be disposed at a second level location of the sidewall of the monitoring cavity 102.
In a specific implementation process, the first liquid level position may be a liquid level at which a lowest liquid level of the monitoring cavity 102 is located, and the second liquid level position may be a liquid level at which a highest liquid level of the monitoring cavity 102 is located. When the controller 500 detects a liquid level signal through the second liquid level sensor 400, the discharge valve 106 is controlled to be opened to discharge the liquid in the gas-liquid separation device; when the controller 500 fails to detect the liquid level signal through the first liquid level sensor 300, the discharge valve 106 is controlled to be closed to stop the discharge of the liquid in the gas-liquid separation device.
Because the liquid level of the gas-liquid separation device may be affected by acceleration or gradient change during the actual use process of the gas-liquid separation device, the liquid level signals generated by the first liquid level sensor 300 and the second liquid level sensor 400 are not perpendicular to the inner wall of the tank body 100 any more, and the actual liquid level condition may not be necessarily represented.
Based on this, as an alternative embodiment, the first liquid level position may be determined according to a first preset angle constant and the distance between the drain valve 106 and the side wall of the monitoring cavity 102; the second liquid level position may be determined based on a second predetermined angle constant and the distance between the collection port 107 and the side wall of the monitoring cavity 102.
In the implementation process, referring to fig. 3, if the inclination angle of the liquid surface is a first preset angle constant, the horizontal distance between the first liquid level position and the discharge valve 106 can be calculated by using the following formula:
L 2 ＝L 1 /cosα 1
wherein L is 2 L is the horizontal distance between the first level position and the drain valve 106 1 Alpha is the distance between the discharge valve 106 and the side wall of the monitoring chamber 102 1 Is a first predetermined angle constant.
The first liquid level position is the lowest liquid level position that can be set by the first liquid level sensor 300. Once the first liquid level sensor 300 is set lower than the first liquid level position, there may be a case where the first liquid level sensor 300 is always able to detect the liquid, which in turn causes the controller 500 to be in an open state without closing the gas-liquid separation device even if there is no liquid dischargeable in the gas-liquid separation device after controlling the discharge valve 106 to be opened, so that the gas-liquid separation device is disabled.
Specific to the first preset angle constant, the first preset angle constant can be set according to the use condition of the gas-liquid separation device. For example, if the gas-liquid separation device is disposed on an automobile, the first preset angle constant may be set according to a maximum climbing gradient or a maximum downhill gradient of the automobile.
In the implementation process, as shown in fig. 4, if the inclination angle of the liquid surface is a second preset angle constant, the horizontal distance between the second liquid level position and the collection port 107 can be calculated by using the following formula:
L 4 ＝L 3 /cosα 2
wherein L is 4 L is the horizontal distance between the second liquid level position and the collection port 107 3 For the distance α between the collection port 107 and the side wall of the monitoring chamber 102 2 Is a second predetermined angle constant.
The second liquid level position is the highest liquid level position that can be set by the second liquid level sensor 400. Once the second liquid level sensor 400 is set higher than the second liquid level position, there may be a case where the second liquid level sensor 400 cannot detect the liquid when the liquid level is backward flowed into the collection port 107, thereby causing the controller 500 not to control the discharge valve 106 to be opened, so that the liquid in the gas-liquid separation device is backward flowed into the collection port 107.
For the second preset angle constant, specifically, the second preset angle constant can be set according to the use condition of the gas-liquid separation device. For example, if the gas-liquid separation device is disposed on an automobile, the second preset angle constant may be set according to a maximum climbing gradient or a maximum downhill gradient of the automobile.
In an embodiment of the present invention, both the first liquid level sensor 300 and the second liquid level sensor 400 may be photoelectric liquid level sensors. When the liquid submerges the lens of the photoelectric level switch in the photoelectric level sensor, the amount of light received by the receiver in the photoelectric level sensor is reduced due to refraction of light into the liquid, and at this time, the first level sensor 300 and the second level sensor 400 generate a level signal and transmit the level signal to the controller 500.
In a second aspect, the present invention provides, by way of an embodiment of the present invention, a fuel cell system, as shown in fig. 5, comprising a controller 500, a gas supply device 600, a fuel cell 700, and a gas-liquid separation device 800 of any one of the first aspects; wherein the gas-liquid separation device 800 is connected to the discharge port 701 of the fuel cell 700, and is used for receiving the liquid and gas discharged from the fuel cell 700; the controller 500 is electrically connected to the fuel cell 700 and the gas-liquid separation device 800; the gas supply device 600 is used to supply gas required for operation to the fuel cell 700.
Specifically, the collection port 107 of the gas-liquid separation device 800 is connected to the discharge port 701 of the fuel cell 700, so that liquid generated during the operation of the fuel cell 700 can be collected by the gas-liquid separation device 800, and gas that is not utilized by the fuel cell 700 can also be collected by the gas-liquid separation device 800.
In the specific implementation process, during the operation of the fuel cell 700, the anode of the fuel cell 700 continuously generates liquid, and the liquid enters the gas-liquid separation device 800 from the discharge port 701 of the fuel cell 700 and is continuously accumulated in the gas-liquid separation device 800.
As the liquid level in the gas-liquid separation device 800 continuously rises, when the liquid level reaches the second liquid level sensor 400, the controller 500 detects a liquid level signal through the second liquid level sensor 400, and controls the gas-liquid separation device 800 to drain. Under the combined action of the gas pressure and the liquid pressure in the gas-liquid separation device 800, the liquid level continuously drops, and when the liquid level reaches the first liquid level sensor 300, the controller 500 detects a liquid level signal through the first liquid level sensor 300, so as to control the gas-liquid separation device 800 to stop liquid discharge.
When the gas-liquid separation device 800 is controlled to stop liquid discharge, a liquid column with a certain height is reserved in the pipe section of the discharge port of the gas-liquid separation device 800, so that the gas in the gas-liquid separation device 800 is separated from the mixed gas at the tail end of the discharge valve 106, and only the effect of single water discharge is realized. If the liquid column in the outlet pipe section of the gas-liquid separation device 800 is discharged, the gas in the gas-liquid separation device 800 is communicated with the mixed exhaust gas at the tail end of the discharge valve 106, so that the effect of discharging the gas in the gas-liquid separation device 800 can be realized.
In addition, the gas supply device 600 may be further connected to the gas-liquid separation device 800 to reuse the gas discharged from the gas-liquid separation device 800 and supply it to the fuel cell 700, thereby improving the utilization efficiency of the gas.
By independently controlling the liquid discharging process and the air discharging process of the gas-liquid separation device 800, the pressure fluctuation phenomenon caused by the sudden pressure drop in the gas pipeline in most liquid discharging and air discharging processes is avoided, and the control difficulty of the air discharging process of the gas-liquid separation device 800 is reduced.
In a third aspect, the present invention provides, by an embodiment of the present invention, a fuel cell system control method applied to the fuel cell system in the second aspect.
Referring to fig. 6, the control method includes the following steps:
step S601: if it is detected that the fuel cell 700 is in an operating state, the concentration of the target gas that enters the gas-liquid separation device 800 is obtained.
Specifically, the operating state of the fuel cell 700 may be acquired by the controller 500, and the concentration of the target gas may be detected by the target gas concentration sensor when the fuel cell 700 is in the operating state; wherein the target gas concentration sensor may be disposed at a position upstream of the collection port 107 of the gas-liquid separation apparatus 800.
In the implementation process, the target gas may be hydrogen, and the target gas concentration sensor may be a hydrogen concentration sensor.
Step S602: when the concentration of the target gas reaches a preset concentration threshold, the working state of the gas-liquid separation device 800 is controlled according to the liquid level signals of the first liquid level sensor 300 and the second liquid level sensor 400; otherwise, the gas-liquid separation device 800 is controlled to be in a discharge state until the concentration of the target gas reaches a preset concentration threshold, and the gas-liquid separation device 800 is controlled to stop the discharge.
Specifically, the preset concentration threshold may be set according to the utilization efficiency of the gas by the gas supply device 600, or may be set according to the minimum requirement of the fuel cell 700 for the concentration of the gas. For example, the preset concentration threshold may be any value between 80% and 90%.
Specifically, controlling the operation state of the gas-liquid separation device 800 according to the liquid level signals of the first liquid level sensor 300 and the second liquid level sensor 400 may include: if the liquid level signal of the first liquid level sensor 300 is detected, controlling the gas-liquid separation device 800 to be in a discharge state to discharge the liquid in the tank 100; until it is detected that the liquid level signal of the second liquid level sensor 400 disappears, the gas-liquid separation device 800 is controlled to stop discharging the liquid in the tank 100.
In order to prevent the gas-liquid separation device 800 from being frozen and failing in a low-temperature environment, particularly when the fuel cell system is not operating, liquid remains in the gas-liquid separation device 800. The control method may further include: if the fuel cell 700 is detected to be in the shutdown purge state, the gas-liquid separation device 800 is controlled to be in the discharge state, until the fuel cell system is detected not to be in the shutdown purge mode, the gas-liquid separation device 800 is controlled to stop the discharge.
By evacuating the liquid in the gas-liquid separation device 800 when the fuel cell 700 is detected to be in the shutdown purge state, the situation that the gas-liquid separation device 800 is frozen and damaged and fails in a low-temperature environment is effectively avoided.
In a fourth aspect, the present invention provides, by an embodiment of the present invention, a fuel cell system control apparatus applied to the fuel cell system in the second aspect. The control device may be configured to: upon detecting that the fuel cell 700 is in an operating state, acquiring the concentration of the target gas that enters the gas-liquid separation device 800; when the concentration of the target gas reaches a preset concentration threshold, the working state of the gas-liquid separation device 800 is controlled according to the liquid level signals of the first liquid level sensor 300 and the second liquid level sensor 400; otherwise, the gas-liquid separation device 800 is controlled to be in a discharge state until the concentration of the target gas reaches a preset concentration threshold, and the gas-liquid separation device 800 is controlled to stop the discharge.
As an alternative embodiment, the control device may also be used for: when the fuel cell 700 is detected to be in the shutdown purge state, the gas-liquid separation device 800 is controlled to be in the discharge state until the fuel cell system is detected not to be in the shutdown purge mode, the gas-liquid separation device 800 is controlled to stop the discharge.
Since the fuel cell system control method described in this embodiment is a method adopted to implement the fuel cell system control device in this embodiment, based on the fuel cell system control method described in this embodiment, those skilled in the art will be able to understand the specific implementation of the method in this embodiment and various modifications thereof, so how this method is implemented in this embodiment will not be described in detail herein. The method of implementing the fuel cell system control device according to the embodiment of the present invention is within the scope of the present invention.
The technical scheme provided by the embodiment of the invention at least has the following technical effects or advantages:
1. because the tank body 100 comprises the liquid storage cavity 101 and the monitoring cavity 102, and the vent hole 103 and the liquid through hole 104 are arranged between the liquid storage cavity 101 and the monitoring cavity 102, the liquid level in the liquid storage cavity 101 and the liquid level in the monitoring cavity 102 change slowly. Because the first liquid level sensor 300 and the second liquid level sensor 400 are arranged at different liquid level positions of the monitoring cavity 102, when the tank body is affected by factors such as jolt, acceleration, deceleration or gradient change, the liquid levels in the monitoring cavity 102 and the liquid storage cavity 101 cannot generate larger fluctuation, so that the situation that the first liquid level sensor 300 and the second liquid level sensor 400 generate error liquid level signals is reduced, and the accuracy of detecting the liquid levels by the first liquid level sensor 300 and the second liquid level sensor 400 is improved.
2. Because the floating baffle 200 is disposed in the monitoring cavity 102 and between the first liquid level sensor 300 and the second liquid level sensor 400, the floating baffle 200 can weaken fluctuation of the liquid level in the monitoring cavity 102 by floating on the liquid level of the monitoring cavity 102, so that the situation that the first liquid level sensor 300 and the second liquid level sensor 400 generate error liquid level signals is further reduced, and further, the liquid discharge or exhaust process of the tank 100 can be controlled more accurately through the controller 500.
It will be appreciated by those skilled in the art that embodiments of the invention may be provided as a method, system, or computer product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the invention may take the form of a computer product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer instructions. These computer instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (9)
1. A gas-liquid separation device applied to a fuel cell system including a controller, characterized by comprising:
the tank body comprises a liquid storage cavity and a monitoring cavity, and a vent hole and a liquid through hole are arranged between the liquid storage cavity and the monitoring cavity;
the first liquid level sensor and the second liquid level sensor are arranged at different liquid level positions of the monitoring cavity; the first liquid level sensor and the second liquid level sensor are electrically connected with the controller; the controller is used for controlling the liquid discharge or exhaust process of the tank body according to the liquid level signals of the first liquid level sensor and the second liquid level sensor;
the floating baffle is arranged in the monitoring cavity and is positioned between the first liquid level sensor and the second liquid level sensor;
the floating baffle comprises:
an upper floating plate, a hollow plate and a lower floating plate which are sequentially stacked;
a first through hole is formed in the thickness direction of the upper floating plate, and a second through hole is formed in the thickness direction of the lower floating plate;
the first through holes and the second through holes are opposite to the hollow area of the hollow plate, and the first through holes and the second through holes are arranged in a staggered mode.
2. The device as claimed in claim 1, wherein the tank is further provided with:
the discharge valve is electrically connected with the controller;
the controller is specifically configured to: and controlling the opening and closing states of the discharge valve according to the liquid level signals of the first liquid level sensor and the second liquid level sensor.
3. The apparatus of claim 2, wherein,
the discharge valve is arranged at the bottom of the tank body;
the first liquid level sensor is arranged at a first liquid level position of the side wall of the monitoring cavity;
the first liquid level position is determined according to a first preset angle constant and the distance between the discharge valve and the side wall of the monitoring cavity.
4. The apparatus of claim 2, wherein the canister is further provided with:
the collecting port is formed in the top of the tank body;
the second liquid level sensor is arranged at a second liquid level position of the side wall of the monitoring cavity;
the second liquid level position is determined according to a second preset angle constant and the distance between the collecting port and the side wall of the monitoring cavity.
5. A fuel cell system comprising a controller, a fuel cell, a gas supply device, and the gas-liquid separation device according to any one of claims 1 to 4; the gas-liquid separation device is connected with the discharge port of the fuel cell and is used for receiving liquid and gas discharged by the fuel cell; the controller is electrically connected with the fuel cell and the gas-liquid separation device; the gas supply device is used for supplying gas required for operation to the fuel cell.
6. A control method of a fuel cell system according to claim 5, characterized by being applied to the fuel cell system, comprising:
if the fuel cell is detected to be in the running state, acquiring the concentration of target gas entering the gas-liquid separation device;
when the concentration of the target gas reaches a preset concentration threshold value, controlling the working state of the gas-liquid separation device according to the liquid level signals of the first liquid level sensor and the second liquid level sensor; otherwise, controlling the gas-liquid separation device to be in a discharge state, and controlling the gas-liquid separation device to stop discharging until the concentration of the target gas reaches the preset concentration threshold value.
7. The method of claim 6, wherein controlling the operating state of the gas-liquid separation device based on the liquid level signals of the first liquid level sensor and the second liquid level sensor comprises:
if the liquid level signal of the first liquid level sensor is detected, controlling the gas-liquid separation device to be in a discharge state so as to discharge the liquid in the tank body;
and controlling the gas-liquid separation device to stop discharging until the liquid level signal of the second liquid level sensor is detected to disappear, so as to stop discharging the liquid in the tank body.
8. The method of claim 6, wherein the method further comprises:
and if the fuel cell is detected to be in the shutdown purging state, controlling the gas-liquid separation device to be in the discharging state, and controlling the gas-liquid separation device to stop discharging until the fuel cell system is detected not to be in the shutdown purging mode.
9. A fuel cell system control apparatus, applied to the fuel cell system according to claim 5, for:
when the fuel cell is detected to be in an operating state, acquiring the concentration of target gas entering the gas-liquid separation device;
when the concentration of the target gas reaches a preset concentration threshold value, controlling the working state of the gas-liquid separation device according to the liquid level signals of the first liquid level sensor and the second liquid level sensor; otherwise, controlling the gas-liquid separation device to be in a discharge state, and controlling the gas-liquid separation device to stop discharging until the concentration of the target gas reaches the preset concentration threshold value.
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| CN115233247A (en) * | 2022-06-23 | 2022-10-25 | 中国船舶重工集团公司第七一八研究所 | Gas-liquid separation device and separation method of offshore wind electrolysis hydrogen production system |
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