CN114068996B - Purging system and purging method for fuel cell packaging box - Google Patents
Purging system and purging method for fuel cell packaging box Download PDFInfo
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- CN114068996B CN114068996B CN202210051505.5A CN202210051505A CN114068996B CN 114068996 B CN114068996 B CN 114068996B CN 202210051505 A CN202210051505 A CN 202210051505A CN 114068996 B CN114068996 B CN 114068996B
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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
- H01M8/04223—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells
- H01M8/04231—Purging of the reactants
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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
- H01M8/06—Combination of fuel cells with means for production of reactants or for treatment of residues
- H01M8/0662—Treatment of gaseous reactants or gaseous residues, e.g. cleaning
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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
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Abstract
The invention provides a purging system and a purging method for a fuel cell packaging box, which relate to the technical field of fuel cell equipment and comprise a cell stack, an air compression mechanism, a gas-liquid separation mechanism and a purging mechanism; the battery electric pile is accommodated in the packaging box body, and the air compression mechanism conveys air in the atmosphere into the battery electric pile; the source of the gas introduced into the packaging box body of the cell stack for purging is the waste gas discharged from the air outlet of the cell stack, and the power consumption is not required to be additionally increased by an air compressor, so that the overall working efficiency of the fuel cell engine is improved; simultaneously, because of entering into the gas that sweeps in the encapsulation box for the air outlet tail gas of battery galvanic pile, the oxygen content in this tail gas is less than the gas before getting into the galvanic pile greatly, uses the gas of this low oxygen content to sweep the inside hydrogen of battery galvanic pile encapsulation box, with the danger of the internal hydrogen of greatly reduced galvanic pile encapsulation box, has promoted fuel cell's safety in utilization.
Description
Technical Field
The invention relates to the technical field of fuel cell equipment, in particular to a purging system and a purging method for a fuel cell packaging box body.
Background
In order to meet the protection level requirement of IP67, a fuel cell engine needs to use a closed box to seal the galvanic pile, and in the working process of the engine, the galvanic pile can permeate a small part of hydrogen outwards all the time, and the hydrogen is accumulated in the galvanic pile packaging box and has certain danger, so that the accumulated hydrogen needs to be discharged in time.
In the prior art, the hydrogen purging mode in the fuel cell packaging box is that an air path branch is arranged after air provided by an air compressor is cooled by an intercooler, partial air in the air cooled by the intercooler is introduced into the cell stack packaging box, hydrogen accumulated in the packaging box is blown out to an engine tail exhaust pipeline, and the hydrogen inside the packaging box is taken away in real time.
However, in the purging scheme of the fuel cell packaging box in the prior art, a fuel cell engine is required to additionally provide a part of power for an air compressor, a branch is formed at the front end of air entering a stack, a part of supplied air is wasted, the power consumption of the air compressor is increased, and the power generation efficiency of the fuel cell engine is reduced; meanwhile, the oxygen content in the air before entering the galvanic pile is high, and after the oxygen is introduced into the packaging box body, the oxygen and the hydrogen in the packaging box body are easy to generate chemical reaction, so that the danger is high.
Disclosure of Invention
The invention aims to provide a purging system and a purging method for a fuel cell packaging box body, which are used for relieving the technical problems that in the prior art, part of wasted supply air is supplied, the power consumption of an air compressor is increased, the power generation efficiency of a fuel cell engine is reduced, and the oxygen content of the air before entering the packaging box body of a galvanic pile is high, so that potential safety hazards are easily caused by the reaction with hydrogen in the packaging box body.
The invention provides a purging system for a fuel cell packaging box, which comprises: the device comprises a battery pile, an air compression mechanism, a gas-liquid separation mechanism and a blowing mechanism;
the battery electric pile is accommodated in the packaging box body, an air inlet of the battery electric pile is communicated with the external environment through the air compression mechanism, and the air compression mechanism is used for conveying air in the atmosphere into the battery electric pile;
the air outlet of the battery electric pile is communicated with the external environment through the gas-liquid separation mechanism, the battery electric pile is used for conveying a gas-liquid mixture to the gas-liquid separation mechanism, the gas-liquid separation mechanism is used for separating gas from liquid, two ends of the purging mechanism are respectively communicated with the gas-liquid separation mechanism and the packaging box body, and the purging mechanism is used for conveying part of gas separated by the gas-liquid separation mechanism to the inside of the packaging box body so as to purge hydrogen in the packaging box body.
In a preferred embodiment of the invention, the purge mechanism comprises a flow control valve;
the flow control valve is respectively communicated with the gas-liquid separation mechanism and the packaging box body, and is used for adjusting the flow of gas output by the gas-liquid separation mechanism so as to control the purging or stopping of the hydrogen in the packaging box body.
In a preferred embodiment of the present invention, the purge mechanism further comprises an air dryer;
the flow control valve is connected with the packaging box body through the air dryer, the flow control valve is used for adjusting the gas output by the gas-liquid separation mechanism, the gas is conveyed to the interior of the packaging box body through the air dryer, and the air dryer is used for drying the gas output by the gas-liquid separation mechanism.
In the preferred embodiment of the invention, the air conditioner also comprises an air main path and an air branch path;
the air main path is sequentially connected with the battery electric pile and the gas-liquid separation mechanism so as to convey gas and liquid output by the gas-liquid separation mechanism to an external environment, two ends of the air branch path are respectively connected with the packaging box body and one end, close to the external environment, of the air main path, and the air branch path is used for converging hydrogen and purge air in the packaging box body to the air main path.
In the preferred embodiment of the invention, the hydrogen concentration sensor also comprises a controller and a hydrogen concentration sensor;
the controller respectively with hydrogen concentration sensor with flow control valve signal connection, hydrogen concentration sensor is located the air branch road is close to one side of encapsulation box, hydrogen concentration sensor with the air branch road is connected, hydrogen concentration sensor is used for monitoring the hydrogen concentration information in the encapsulation box, and with this concentration information transport to controller department, the controller corresponds the control the aperture of flow control valve.
In the preferred embodiment of the invention, the device also comprises a backpressure valve;
the back pressure valve is positioned at one end of the main air path close to the external environment and is connected with the main air path, and the back pressure valve is used for controlling the pressure regulation and the opening and closing of the main air path;
the air branch is connected with the rear end of the air main path far away from the backpressure valve, so that the gas conveyed by the air branch and the gas conveyed by the backpressure valve are converged and discharged at the rear end of the air main path.
In a preferred embodiment of the present invention, the air compression mechanism includes an air filter, an air compressor and a intercooler;
the air filter the air compressor machine with the intercooler connects gradually, the air filter be used for with external environment intercommunication, the intercooler with the battery galvanic pile intercommunication to with through the gas transport of filtration, compression and cooling extremely inside the battery galvanic pile.
In a preferred embodiment of the present invention, a humidifier is further included;
the humidifier comprises a dry side and a wet side, two ends of the dry side of the humidifier are respectively connected with the intercooler and the cell stack, two ends of the wet side of the humidifier are respectively connected with the gas-liquid separation mechanism and the cell stack, and the humidifier is used for humidifying dry gas conveyed in the dry side through a gas-liquid mixture conveyed in the wet side and conveying a mixed gas-liquid mixture to the gas-liquid separation mechanism.
The invention provides a purging method based on a fuel cell packaging box purging system, which comprises the following steps:
air in the atmosphere is filtered, compressed, cooled and humidified and is conveyed into a cell stack;
gas-liquid mixture after the reaction of the cell stack is subjected to gas-liquid separation and then discharged to the atmosphere;
drying the dried gas after gas-liquid separation again and then purging the interior of the packaging box body of the cell stack;
and (4) converging hydrogen and dry gas in the packaging box body with the gas-liquid mixture, and uniformly discharging the hydrogen and the dry gas into the atmosphere.
In a preferred embodiment of the present invention, the step of purging the packaging box of the cell stack further comprises:
presetting a hydrogen concentration threshold interval inside the packaging box body;
detecting the hydrogen concentration of the gas output by the packaging box body;
when the hydrogen concentration in the packaging box body is smaller than the lowest value of the preset hydrogen concentration threshold range, controlling the flow control valve to be closed so as to discharge all the gas separated by the gas-liquid separation mechanism to the atmosphere;
when the hydrogen concentration in the packaging box body is within the preset hydrogen concentration threshold range, controlling the flow control valve to be gradually opened so as to enable the gas separated by the gas-liquid separation mechanism to purge the interior of the packaging box body;
and when the hydrogen concentration in the packaging box body is greater than the highest value of the preset hydrogen concentration threshold range, controlling the flow control valve to be completely opened and sending alarm information to the center console.
The invention provides a purging system for a fuel cell packaging box, which comprises: the device comprises a battery pile, an air compression mechanism, a gas-liquid separation mechanism and a blowing mechanism; the battery electric pile is accommodated in the packaging box body, an air inlet of the battery electric pile is communicated with the external environment through an air compression mechanism, and the air compression mechanism is used for conveying air in the atmosphere into the battery electric pile; an air outlet of the battery electric pile is communicated with the external environment through a gas-liquid separation mechanism, the battery electric pile is used for conveying a gas-liquid mixture to the gas-liquid separation mechanism, the gas-liquid separation mechanism is used for separating gas from liquid, two ends of the purging mechanism are respectively communicated with the gas-liquid separation mechanism and the packaging box body, and the purging mechanism is used for conveying part of gas separated by the gas-liquid separation mechanism to the interior of the packaging box body so as to purge hydrogen in the packaging box body; the source of the gas introduced into the packaging box body of the cell stack for purging is the waste gas discharged from the air outlet of the cell stack, and the power consumption is not required to be additionally increased by an air compressor, so that the overall working efficiency of the fuel cell engine is improved; meanwhile, the gas entering the packaging box body for purging is the tail gas at the air outlet of the cell stack, the oxygen content in the tail gas is greatly lower than that before entering the cell stack, and the gas with low oxygen content is used for purging the hydrogen in the packaging box body of the cell stack, so that the danger of the hydrogen in the packaging box body of the cell stack is greatly reduced, and the use safety of the fuel cell is improved; the technical problems that the air is supplied by a waste part, the power consumption of an air compressor is increased, the power generation efficiency of a fuel cell engine is reduced, the oxygen content of the air is high before the air enters the packaging box body of the galvanic pile, and potential safety hazards are caused due to the fact that the air reacts with hydrogen in the packaging box body easily in the prior art are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art 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 can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic flow structure diagram of a purging system for a fuel cell enclosure according to an embodiment of the present invention.
Icon: 100-cell stack; 200-an air compression mechanism; 201-air filter; 202-an air compressor; 203-an intercooler; 300-a gas-liquid separation mechanism; 400-a purge mechanism; 401-a flow control valve; 402-an air dryer; 500-main air path; 600-air branch; 700-hydrogen concentration sensor; 800-backpressure valve; 900-humidifier.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present embodiment provides a purging system for a fuel cell enclosure, including: a cell stack 100, an air compression mechanism 200, a gas-liquid separation mechanism 300, and a purge mechanism 400; the cell stack 100 is accommodated in the packaging box, an air inlet of the cell stack 100 is communicated with the external environment through an air compression mechanism 200, and the air compression mechanism 200 is used for conveying air in the atmosphere into the cell stack 100; the air outlet of the cell stack 100 is communicated with the external environment through the gas-liquid separation mechanism 300, the cell stack 100 is used for conveying a gas-liquid mixture to the gas-liquid separation mechanism 300, the gas-liquid separation mechanism 300 is used for separating gas from liquid, two ends of the purging mechanism 400 are respectively communicated with the gas-liquid separation mechanism 300 and the packaging box body, and the purging mechanism 400 is used for conveying part of gas separated by the gas-liquid separation mechanism 300 to the inside of the packaging box body so as to purge hydrogen in the packaging box body.
It should be noted that the fuel cell enclosure purging system provided in this embodiment changes the existing hydrogen purging manner of the fuel cell, specifically, when the fuel cell is operating normally, the air compression mechanism 200 filters, compresses, cools, humidifies and conveys air in the atmosphere to the inside of the cell stack 100 for reaction, and conveys a gas-liquid mixture formed by gas and liquid after the reaction is completed to the gas-liquid separation mechanism 300, the gas-liquid separation mechanism 300 can separate gas from liquid water, and the liquid water and gas can be discharged to the atmosphere; the part of the gas without liquid water at the separation part of the gas-liquid separation mechanism 300 is conveyed to the purging mechanism 400, the part of the gas enters the packaging shell of the cell stack 100 for purging by the adjusting and conveying of the purging mechanism 400, and the hydrogen in the packaging box can be driven by the purging of the gas, so that the hydrogen and the recovered gas are discharged out of the packaging box together to complete the purging of the interior of the packaging box; because the gas entering the packaging shell for purging is part of the gas recovered after the cell stack 100 completes the reaction, the air at the position of the air compression mechanism 200 is no longer required to purge the interior of the packaging shell, so that the gas at the position of the air compression mechanism 200 completely enters the cell stack 100 for reaction, and the working efficiency of the fuel cell is improved; meanwhile, the oxygen content in the recovered gas is greatly lower than that of the gas at the air compression mechanism 200, and the gas with low oxygen content is used for purging the hydrogen, so that the potential safety hazard of the hydrogen is reduced, the use safety of the fuel cell is improved, and the fuel cell is suitable for popularization and application.
Optionally, the fuel cell stack 100 has an internal flow channel inside, the internal flow channel of the fuel cell stack 100 can receive the gas delivered by the air compression mechanism 200, and the internal flow channel of the fuel cell stack 100 can also receive the hydrogen delivered by the hydrogen tank for reaction, and since the fuel cell stack 100 belongs to a structure known in the art, details thereof are not described herein.
The embodiment provides a fuel cell encapsulates box purge system, includes: a cell stack 100, an air compression mechanism 200, a gas-liquid separation mechanism 300, and a purge mechanism 400; the cell stack 100 is accommodated in the packaging box, an air inlet of the cell stack 100 is communicated with the external environment through an air compression mechanism 200, and the air compression mechanism 200 is used for conveying air in the atmosphere into the cell stack 100; an air outlet of the cell stack 100 is communicated with the external environment through the gas-liquid separation mechanism 300, the cell stack 100 is used for conveying a gas-liquid mixture to the gas-liquid separation mechanism 300, the gas-liquid separation mechanism 300 is used for separating gas from liquid, two ends of the purging mechanism 400 are respectively communicated with the gas-liquid separation mechanism 300 and the packaging box body, and the purging mechanism 400 is used for conveying the gas separated by the gas-liquid separation mechanism 300 to the inside of the packaging box body so as to purge hydrogen in the packaging box body; the source of the gas introduced into the packaging box of the cell stack 100 for purging is the waste gas discharged from the air outlet of the cell stack 100, so that the power consumption is not required to be additionally increased by the air compressor 202, and the overall working efficiency of the fuel cell engine is improved; meanwhile, because the gas entering the packaging box body for purging is the tail gas at the air outlet of the cell stack 100, the oxygen content in the tail gas is greatly lower than that before entering the stack, and the gas with low oxygen content is used for purging the hydrogen in the packaging box body of the cell stack 100, so that the danger of the hydrogen in the packaging box body of the stack is greatly reduced, and the use safety of the fuel cell is improved; the technical problems that the air is supplied by the waste part in the prior art, the power consumption of the air compressor 202 is increased, the power generation efficiency of a fuel cell engine is reduced, the oxygen content of the air is high before the electric pile is charged into the packaging box body, and potential safety hazards are caused by the reaction of the air and the hydrogen in the packaging box body easily are solved.
Further, on the basis of the above-mentioned embodiment, in a preferred embodiment of the present invention, the purge mechanism 400 includes a flow control valve 401; the flow control valve 401 is respectively communicated with the gas-liquid separation mechanism 300 and the packaging box, and the flow control valve 401 is used for adjusting the flow of the gas output by the gas-liquid separation mechanism 300 so as to control the purging or stopping of the hydrogen inside the packaging box.
In this embodiment, the flow control valve 401 may be connected to the gas outlet of the gas-liquid separation mechanism 300, that is, when the flow control valve 401 is opened, the gas outlet of the gas-liquid separation mechanism 300 delivers the separated gas without liquid water; alternatively, the flow control valve 401 may employ a solenoid valve.
In the preferred embodiment of the present invention, the purge mechanism 400 further includes an air dryer 402; the flow control valve 401 is connected with the packaging box through an air dryer 402, the flow control valve 401 is used for adjusting the gas output by the gas-liquid separation mechanism 300 and conveying the gas to the interior of the packaging box through the air dryer 402, and the air dryer 402 is used for drying the gas output by the gas-liquid separation mechanism 300.
In this embodiment, the air entering the enclosure of the cell stack 100 is dried in advance by the air dryer 402, so as to prevent the moisture from being condensed inside the enclosure of the cell stack 100, so that the air entering the enclosure of the cell stack 100 maintains a certain dryness, and the air inside the enclosure of the cell stack 100 is in a dry state, thereby reducing the risk of air breakdown inside the enclosure and preventing the occurrence of a dangerous situation of high air humidity and easy conduction.
In the preferred embodiment of the present invention, it further comprises an air main path 500 and an air branch path 600; the air main circuit 500 is sequentially connected with the cell stack 100 and the gas-liquid separation mechanism 300 so as to convey gas and liquid output by the gas-liquid separation mechanism 300 to the external environment, two ends of the air branch circuit 600 are respectively connected with the packaging box body and one end of the air main circuit 500 close to the external environment, and the air branch circuit 600 is used for converging hydrogen and purging air in the packaging box body into the air main circuit 500.
In this embodiment, the air main circuit 500 may be a sealed pipeline in which the air compression mechanism 200, the cell stack 100, and the gas-liquid separation mechanism 300 are sequentially connected, and the air main circuit 500 may allow high-pressure gas of the air compression mechanism 200 to enter the cell stack 100, and the air main circuit 500 may also uniformly convey waste gas and liquid water after the reaction of the cell stack 100 is completed to the gas-liquid separation mechanism 300, and discharge the waste gas and a part of waste water to the atmospheric environment together after the separation by the gas-liquid separation mechanism 300 is completed; the air branch 600 is used as a sealed pipeline for purging gas, wherein the gas-liquid separation mechanism 300, the flow control valve 401 and the air dryer 402 are sequentially connected in a sealing manner through the air branch 600, and the air branch 600 can also be connected in a sealing manner with an outlet position of the packaging shell, so that the purged gas is converged and discharged by using the tail end position of the air main circuit 500.
In the preferred embodiment of the present invention, a controller and a hydrogen concentration sensor 700 are further included; the controller respectively with hydrogen concentration sensor 700 and flow control valve 401 electric signal connection, hydrogen concentration sensor 700 is located the one side that air branch 600 is close to the encapsulation box, hydrogen concentration sensor 700 is connected with air branch 600, hydrogen concentration sensor 700 is used for monitoring the hydrogen concentration information in the encapsulation box through air branch 600 to carry this concentration information to controller department, the controller corresponds the aperture of controlling flow control valve 401.
In this embodiment, the controller may be an internal controller of a fuel cell engine, the hydrogen concentration sensor 700 may monitor the hydrogen concentration in the packaging box of the cell stack 100 in real time, and the fuel cell engine controller may adjust the air flow passing through the flow control valve 401 in real time according to the concentration signal, so that the hydrogen concentration in the packaging box of the cell stack 100 is always within the required safe concentration range.
Optionally, presetting a hydrogen concentration threshold interval inside the packaging box body aiming at a fuel cell engine controller; when the hydrogen concentration inside the packaging box body is smaller than the lowest value of the preset hydrogen concentration threshold range, controlling the flow control valve 401 to close so as to discharge all the gas separated by the gas-liquid separation mechanism 300 to the atmosphere; when the hydrogen concentration in the packaging box body is within the preset hydrogen concentration threshold range, the flow control valve 401 is controlled to be gradually opened so that the gas separated by the gas-liquid separation mechanism 300 sweeps the interior of the packaging box body; when the hydrogen concentration inside the package box is greater than the maximum value of the preset hydrogen concentration threshold range, the flow control valve 401 is controlled to be completely opened, and alarm information is sent to the center console.
In a preferred embodiment of the present invention, a back pressure valve 800 is further included; the back pressure valve 800 is connected to one end of the main air path 500 close to the external environment, and the back pressure valve 800 is used for controlling the pressure regulation and opening and closing of the main air path 500; the air branch 600 is connected with the rear end of the main air path 500 away from the backpressure valve 800, so that the gas delivered by the air branch 600 and the gas delivered by the backpressure valve 800 are merged and discharged at the rear end of the main air path 500.
In the preferred embodiment of the present invention, the air compressing mechanism 200 includes an air filter 201, an air compressor 202 and a intercooler 203; the air filter 201, the air compressor 202 and the intercooler 203 are connected in sequence, the air filter 201 is used for being communicated with the external environment, and the intercooler 203 is communicated with the cell stack 100 so as to convey filtered, compressed and cooled gas to the interior of the cell stack 100.
In the preferred embodiment of the present invention, a humidifier 900; the humidifier 900 includes a dry side and a wet side, both ends of the dry side of the humidifier 900 are respectively connected with the intercooler 203 and the cell stack 100, both ends of the wet side of the humidifier 900 are respectively connected with the gas-liquid separation mechanism 300 and the cell stack 100, and the humidifier 900 is configured to humidify the dry gas conveyed in the dry side by the gas-liquid mixture conveyed in the wet side and convey the mixed gas-liquid mixture to the gas-liquid separation mechanism 300.
In this embodiment, when the system is in operation, the flow path of the main air path 500 is: atmospheric air → air filter 201 → air compressor 202 → intercooler 203 → dry side of humidifier 900 → internal flow passage of cell stack 100 → wet side of humidifier 900 → gas-liquid separation mechanism 300 → back pressure valve 800 → atmospheric air; the purge air in the enclosure is provided by the air separated by the air-liquid separation mechanism 300, and the air flows through the following route: the gas-liquid separation mechanism 300 → the flow control valve 401 → the air dryer 402 → the inside of the package case → the atmosphere; the air-liquid separation mechanism 300 separates air from liquid water in the wet air provided from the wet side of the humidifier 900, the liquid water and most of the air flow through the backpressure valve 800 into the atmosphere, a small part of the air flow without liquid water flows through the flow control valve 401 into the purging line of the air branch 600, the air is dried by the air dryer 402, and then the dried air enters the packaging box body to take away hydrogen in the packaging box body, and the hydrogen is converged with the main air path 500 at the rear end of the backpressure valve 800 and is discharged into the atmosphere together.
As shown in fig. 1, the present embodiment provides a purging method based on the fuel cell enclosure purging system, including the following steps: air in the atmosphere is filtered, compressed, cooled and humidified and is conveyed into the cell stack 100; gas-liquid mixture after the reaction of the cell stack 100 is subjected to gas-liquid separation and then discharged to the atmosphere; drying the dried gas after gas-liquid separation again and then purging the interior of the packaging box body of the cell stack 100; and (4) converging hydrogen and dry gas in the packaging box body with the gas-liquid mixture, and uniformly discharging the hydrogen and the dry gas into the atmosphere.
In a preferred embodiment of the present invention, the step of purging the enclosure of the cell stack 100 further comprises: presetting a hydrogen concentration threshold interval inside the packaging box body; detecting the hydrogen concentration of the gas output by the packaging box body; when the hydrogen concentration inside the packaging box body is smaller than the lowest value of the preset hydrogen concentration threshold range, controlling the flow control valve 401 to close so as to discharge all the gas separated by the gas-liquid separation mechanism 300 to the atmosphere; when the hydrogen concentration in the packaging box body is within the preset hydrogen concentration threshold range, the flow control valve 401 is controlled to be gradually opened so that the gas separated by the gas-liquid separation mechanism 300 sweeps the interior of the packaging box body; when the hydrogen concentration inside the package box is greater than the maximum value of the preset hydrogen concentration threshold range, the flow control valve 401 is controlled to be completely opened, and alarm information is sent to the center console.
In the purging method of the purging system for the fuel cell package box provided by the embodiment, the source of the gas introduced into the package box of the cell stack 100 for purging is the exhaust gas discharged from the air outlet of the cell stack 100, the air compressor 202 is not required to additionally increase the power consumption, and the overall working efficiency of the fuel cell engine is improved; meanwhile, because the gas entering the packaging box body for purging is the tail gas at the air outlet of the cell stack 100, the oxygen content in the tail gas is greatly lower than that before entering the stack, and the gas with low oxygen content is used for purging the hydrogen in the packaging box body of the cell stack 100, so that the danger of the hydrogen in the packaging box body of the stack is greatly reduced, and the use safety of the fuel cell is improved; meanwhile, an adjusting program is preset by using a controller in the fuel cell engine and the hydrogen concentration sensor 700, and the air flow passing through the flow control valve 401 is adjusted in real time, so that the hydrogen concentration in the packaging box body is always kept within the required safety concentration range; when the hydrogen concentration inside the packaging box body is greater than the highest value of the preset hydrogen concentration threshold range, the controller can send alarm information to the control center console in time at the moment, and workers can overhaul the fuel cell in time, so that the fuel cell packaging box is suitable for popularization and application.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A fuel cell enclosure purging system, comprising: the device comprises a battery pile, an air compression mechanism, a gas-liquid separation mechanism and a blowing mechanism;
the battery electric pile is accommodated in the packaging box body, an air inlet of the battery electric pile is communicated with the external environment through the air compression mechanism, and the air compression mechanism is used for conveying air in the atmosphere into the battery electric pile;
an air outlet of the cell stack is communicated with the external environment through the gas-liquid separation mechanism, the cell stack is used for conveying a gas-liquid mixture to the gas-liquid separation mechanism, the gas-liquid separation mechanism is used for separating gas from liquid, two ends of the purging mechanism are respectively communicated with the gas-liquid separation mechanism and the packaging box body, and the purging mechanism is used for conveying part of gas separated by the gas-liquid separation mechanism to the inside of the packaging box body so as to purge hydrogen in the packaging box body;
the purge mechanism comprises a flow control valve;
the flow control valve is respectively communicated with the gas-liquid separation mechanism and the packaging box body, and is used for adjusting the flow of gas output by the gas-liquid separation mechanism so as to control the purging or stopping of the hydrogen in the packaging box body;
the air conditioner also comprises an air main path and an air branch path; the air main path is sequentially connected with the battery electric pile and the gas-liquid separation mechanism so as to convey gas and liquid output by the gas-liquid separation mechanism to the external environment, two ends of the air branch path are respectively connected with the packaging box body and one end, close to the external environment, of the air main path, and the air branch path is used for converging hydrogen and purge air in the packaging box body to the air main path;
the hydrogen concentration sensor is connected with the controller; the controller respectively with hydrogen concentration sensor with flow control valve signal connection, hydrogen concentration sensor is located the air branch road is close to one side of encapsulation box, hydrogen concentration sensor with the air branch road is connected, hydrogen concentration sensor is used for monitoring the hydrogen concentration information in the encapsulation box, and with this concentration information transport to controller department, the controller corresponds the control the aperture of flow control valve.
2. The fuel cell enclosure purge system of claim 1, wherein the purge mechanism further comprises an air dryer;
the flow control valve is connected with the packaging box body through the air dryer, the flow control valve is used for adjusting the gas output by the gas-liquid separation mechanism, the gas is conveyed to the interior of the packaging box body through the air dryer, and the air dryer is used for drying the gas output by the gas-liquid separation mechanism.
3. The fuel cell enclosure purge system of claim 2, further comprising a back pressure valve;
the back pressure valve is positioned at one end of the main air path close to the external environment and is connected with the main air path, and the back pressure valve is used for controlling the opening and closing of the main air path;
the air branch is connected with the rear end of the air main path far away from the backpressure valve, so that the gas conveyed by the air branch and the gas conveyed by the backpressure valve are converged and discharged at the rear end of the air main path.
4. The fuel cell enclosure purging system of any of claims 1-3, wherein the air compression mechanism comprises an air filter, an air compressor, and a intercooler;
the air filter the air compressor machine with the intercooler connects gradually, the air filter be used for with external environment intercommunication, the intercooler with the battery galvanic pile intercommunication to with through the gas transport of filtration, compression and cooling extremely inside the battery galvanic pile.
5. The fuel cell enclosure purge system of claim 4, further comprising a humidifier;
the humidifier comprises a dry side and a wet side, two ends of the dry side of the humidifier are respectively connected with the intercooler and the cell stack, two ends of the wet side of the humidifier are respectively connected with the gas-liquid separation mechanism and the cell stack, and the humidifier is used for humidifying dry gas conveyed in the dry side through a gas-liquid mixture conveyed in the wet side and conveying a mixed gas-liquid mixture to the gas-liquid separation mechanism.
6. A purging method based on a fuel cell enclosure purging system according to any one of claims 1 to 5, comprising the steps of:
air in the atmosphere is filtered, compressed, cooled and humidified and is conveyed into a cell stack;
gas-liquid mixture after the reaction of the cell stack is subjected to gas-liquid separation and then discharged to the atmosphere;
drying the dried gas after gas-liquid separation again and then purging the interior of the packaging box body of the cell stack;
and (4) converging hydrogen and dry gas in the packaging box body with the gas-liquid mixture, and uniformly discharging the hydrogen and the dry gas into the atmosphere.
7. A purging method for a fuel cell enclosure purging system as claimed in claim 6, wherein the step of purging the enclosure of the cell stack further comprises:
presetting a hydrogen concentration threshold interval inside the packaging box body;
detecting the hydrogen concentration of the gas output by the packaging box body;
when the hydrogen concentration in the packaging box body is smaller than the lowest value of the preset hydrogen concentration threshold range, controlling the flow control valve to be closed so as to discharge all the gas separated by the gas-liquid separation mechanism to the atmosphere;
when the hydrogen concentration in the packaging box body is within the preset hydrogen concentration threshold range, controlling the flow control valve to be gradually opened so as to enable the gas separated by the gas-liquid separation mechanism to purge the interior of the packaging box body;
and when the hydrogen concentration in the packaging box body is greater than the highest value of the preset hydrogen concentration threshold range, controlling the flow control valve to be completely opened and sending alarm information to the center console.
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| CN211629222U (en) * | 2020-01-06 | 2020-10-02 | 郑州宇通客车股份有限公司 | Fuel cell system and exhaust hydrogen purging system using stack waste gas |
| CN113381043A (en) * | 2021-05-28 | 2021-09-10 | 上海申风投资管理有限公司 | Air supply system of fuel cell |
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