CN214668365U - Measuring system and vehicle of fuel cell hydrogen concentration - Google Patents
Measuring system and vehicle of fuel cell hydrogen concentration Download PDFInfo
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- CN214668365U CN214668365U CN202120295445.2U CN202120295445U CN214668365U CN 214668365 U CN214668365 U CN 214668365U CN 202120295445 U CN202120295445 U CN 202120295445U CN 214668365 U CN214668365 U CN 214668365U
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Abstract
The utility model relates to the technical field of fuel cells, in particular to a measuring system of hydrogen concentration of a fuel cell and a vehicle; the system comprises a measurement loop, and a gas-liquid separation component, a heating element, a temperature-pressure-humidity sensor and a hydrogen concentration sensor which are sequentially arranged on the measurement loop; a temperature and pressure sensor is arranged on a measuring loop in front of the heating element; the system performs gas-liquid separation on gas at the outlet of the hydrogen circulating pump, and heats the separated gas until the relative humidity is less than 100%; the hydrogen concentration testing device can be used for obtaining the saturated air pressure of the gas before heating and at the corresponding temperature, the temperature of the heated gas, the saturated air pressure, the humidity and the volume of the heated hydrogen at the corresponding temperature, and obtaining the volume fraction of the heated hydrogen through calculation; through heating the gas after separating, can prevent the condensation of saturated vapor, guarantee the accuracy of measurement.
Description
Technical Field
The utility model relates to a fuel cell technical field, concretely relates to measurement system and vehicle of fuel cell hydrogen concentration.
Background
The proton exchange membrane fuel cell has the working principle that hydrogen and oxygen generate electrochemical reaction to generate water and output electric energy at the same time. Because the voltage of the fuel cell is usually less than 1V, in practical application, hundreds of single cells need to be connected in series to form a fuel cell stack and matched with corresponding peripheral accessories to form a fuel cell system.
Hydrogen is one of reactants of electrochemical reaction of a fuel cell, in an existing fuel cell system, hydrogen recirculation is usually performed on an anode side by means of a hydrogen circulating pump or an ejector, so that the utilization rate of the hydrogen is improved, but the concentration of the hydrogen seriously affects the output performance and the service life of a galvanic pile, and because the anode side usually carries liquid water, an existing hydrogen concentration sensor is easily affected by the liquid water to cause functional failure, and therefore a proper technology needs to be developed to monitor the hydrogen concentration on the anode side.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: provided are a method, a system, a vehicle, and a medium for measuring the hydrogen concentration of a fuel cell, which are simple in structure and low in cost.
In order to solve the technical problem, the utility model discloses a first technical scheme be:
a method for measuring hydrogen concentration of a fuel cell includes
Carrying out gas-liquid separation on gas at the outlet of the hydrogen circulating pump, and heating the separated gas, wherein the relative humidity of the heated gas is less than 100%; obtaining the temperature T before heating the gas7And saturated gas pressure p at the corresponding temperaturesat(T7)；
Obtaining the temperature T of the heated gas10Pressure p10Humidity RH10Saturated gas pressure p at the corresponding temperaturesat(T10) Volume of hydrogen after heating xH2,11And hydrogen volume fraction x after heatingw,11The heated hydrogen gas volume fraction xw,11The calculation method is as follows:
according to the heated gas temperature T10And humidity RH10Obtaining the humidity RH of the gas before heating9The gas humidity RH9The calculation method is as follows:
if RH9Is more than 100 percent; the final hydrogen volume fraction xH2,finalThe calculation method is as follows:
if the gas humidity RH9Less than or equal to 100%, the volume fraction x of hydrogen after heatingw,11Equal to the final hydrogen volume fraction xH2,fin al。
In order to solve the technical problem, the utility model discloses a second kind technical scheme be:
a battery hydrogen concentration measuring system comprises a measuring loop, and a gas-liquid separation component, a heating component, a temperature-pressure-humidity sensor and a hydrogen concentration sensor which are sequentially arranged on the measuring loop;
and a temperature and pressure sensor is arranged on a measuring loop in front of the heating element.
In order to solve the above technical problem, the utility model discloses a third kind technical scheme be:
a vehicle comprising a fuel cell including a hydrogen circulation pump including an inlet and an outlet, and a cell hydrogen concentration measurement system according to the above;
the measuring loop of the cell hydrogen concentration measuring system is connected in parallel with the inlet and the outlet of the hydrogen circulating pump;
one end of the measurement loop with the gas-liquid separation assembly is connected with the upper inlet.
In order to solve the above technical problem, the utility model discloses a fourth technical scheme be:
a medium on which a computer program is stored, which computer program, when executed by a processor, implements the method of measuring the hydrogen concentration of a fuel cell as described above.
The beneficial effects of the utility model reside in that: by the battery hydrogen concentration measuring system and the method, the hydrogen concentration test with low development cost, simple structure and high reliability can be realized; the problems of complex system and high cost caused by measurement in the prior art are solved; by heating the separated gas, the relative humidity of the heated gas is less than 100%, so that the saturated vapor pressure is improved, the condensation of saturated vapor is prevented, and the accuracy of measurement is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a system for measuring hydrogen concentration of a fuel cell according to an embodiment of the present invention;
description of reference numerals: 1. a control valve; 2. a hydrogen circulation pump; 3. an electromagnetic purge valve; 4. a galvanic pile; 5. a pressure regulating valve; 6. an air compressor; 7. a temperature and pressure sensor; 8. a water diversion member; 9. a waterproof and breathable member; 10. a temperature-pressure-humidity sensor; 11. a hydrogen concentration sensor; 12. a heating member; 13. and measuring a loop.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, a method for measuring hydrogen concentration of a fuel cell includes
Carrying out gas-liquid separation on gas at the outlet of the hydrogen circulating pump, and heating the separated gas, wherein the relative humidity of the heated gas is less than 100%; obtaining the temperature T before heating the gas7And saturated gas pressure p at the corresponding temperaturesat(T7)；
Obtaining the temperature T of the heated gas10Pressure p10Humidity RH10Saturated gas pressure p at the corresponding temperaturesat(T10) Volume of hydrogen after heating xH2，11And hydrogen volume fraction x after heatingw，11The heated hydrogen gas volume fraction xw，11The calculation method is as follows:
according to the heated gas temperature T10And humidity RH10Obtaining the humidity RH of the gas before heating9The gas humidity RH9The calculation method is as follows:
if RH9Is more than 100 percent; the final hydrogen volume fraction xH2，finalThe calculation method is as follows:
if the gas humidity RH9Less than or equal to 100%, the volume fraction x of hydrogen after heatingw，11Equal to the final hydrogen volume fraction xH2，final。
Further, the flow ratio of the gas before gas-liquid separation and the gas-liquid separation is less than 5%.
From the above description, the flow ratio before gas-liquid separation and after gas-liquid separation is less than 5%, so that the influence of the measurement process on the normal operation of the system is avoided; alternatively, if the flow ratio is less than 5%, the flow in the measurement circuit may be discharged to the atmosphere with safety ensured.
Further, the flow rate ratio between before and after the gas-liquid separation is 1%.
Further, the final volume fraction x of nitrogen is includedN2(ii) a If RH9Is more than 100 percent; the final nitrogen volume fraction xN2The calculation method is as follows:
if the gas humidity RH9Less than or equal to 100%, the final volume fraction x of nitrogenN2The calculation method is as follows:
xN2＝1-xH2，final-xw，11。
a battery hydrogen concentration measuring system comprises a measuring loop, and a gas-liquid separation component, a heating component, a temperature-pressure-humidity sensor and a hydrogen concentration sensor which are sequentially arranged on the measuring loop;
and a temperature and pressure sensor is arranged on a measuring loop in front of the heating element.
Further, the gas-liquid separation subassembly includes that the branch that sets gradually along measuring the return circuit spare and waterproof ventilative spare.
Further, a flow sensor is further arranged on the measuring loop behind the hydrogen concentration sensor.
As can be seen from the above description, the gas composition can be accurately calculated by the arrangement of the flow sensor.
Furthermore, a pressure regulating part is arranged on the measuring loop behind the hydrogen concentration sensor.
From the above description, it can be seen that by the provision of the pressure regulator, the flow in the measurement circuit can be precisely controlled such that the ratio of the flow in the circuit to the flow in the circulation circuit is less than 5%.
A vehicle comprises a fuel cell, the fuel cell comprises a hydrogen circulating pump, the hydrogen circulating pump comprises an inlet and an outlet, and the vehicle further comprises the battery hydrogen concentration measuring system;
the measuring loop of the cell hydrogen concentration measuring system is connected in parallel with the inlet and the outlet of the hydrogen circulating pump;
one end of the measurement loop with the gas-liquid separation assembly is connected with the upper inlet.
A medium on which a computer program is stored, which when executed by a processor implements the above-described method of measuring a hydrogen concentration of a fuel cell.
As can be seen from the above description, the system and the method for measuring the hydrogen concentration of the battery of the present invention can realize the hydrogen concentration test with low development cost, simple structure and high reliability; the problems of complex system and high cost caused by measurement in the prior art are solved.
Example one
A method for measuring hydrogen concentration of a fuel cell includes
Carrying out gas-liquid separation on gas at the outlet of the hydrogen circulating pump, and heating the separated gas, wherein the relative humidity of the heated gas is less than 100% or less than 80%; obtaining the temperature T before heating the gas7And saturated gas pressure p at the corresponding temperaturesat(T7)；
Obtaining the temperature T of the heated gas10Pressure p10Humidity RH10Saturated gas pressure p at the corresponding temperaturesat(T10) Volume of hydrogen after heating xH2，11And hydrogen volume fraction x after heatingw，11The heated hydrogen gas volume fraction xw，11The calculation method is as follows:
according to the heated gas temperature T10And humidity RH10Obtaining the humidity RH of the gas before heating9(where T is used in the formula)7Because the temperature change in the measurement circuit before and after the gas-liquid separation is extremely small and can be ignored, and is regarded as equivalent, the temperature change is directly used as the temperature after the gas-liquid separation), and the gas humidity RH is9The calculation method is as follows:
if RH9Is more than 100 percent; the final hydrogen volume fraction xH2，finalThe calculation method is as follows:
if the gas humidity RH9Less than or equal to 100%, the volume fraction x of hydrogen after heatingw，11Equal to the final hydrogen volume fraction xH2，final。
The flow ratio of the gas before and after gas-liquid separation is 1%.
Also included is the final nitrogen volume fraction xN2(ii) a If RH9Is more than 100 percent; the final nitrogen volume fraction xN2The calculation method is as follows:
if the gas humidity RH9Less than or equal to 100%, the final volume fraction x of nitrogenN2The calculation method is as follows:
xN2＝1-xH2，final-xw，11。
wherein
Referring to FIG. 1, T7Is the temperature, P, at the temperature and pressure sensor 7sat(T7) The saturated air pressure is the saturated air pressure at the temperature corresponding to the temperature and pressure sensor 7;
T10、p10、RH10temperature, pressure and humidity at the temperature-pressure-humidity sensor 10, Psat(T10) The saturated air pressure of the temperature-pressure-humidity sensor 10 at the corresponding temperature;
xH2，11obtaining the volume of the heated hydrogen for the hydrogen concentration sensor;
RH9is waterproof against the humidity of the gas at the gas permeable member 9.
Example two
Referring to fig. 1, a battery hydrogen concentration measuring system includes a measuring circuit 13, and a gas-liquid separation assembly, a heating element 12, a temperature-pressure-humidity sensor 10 and a hydrogen concentration sensor 11 sequentially disposed on the measuring circuit 13;
a temperature and pressure sensor 7 is arranged on the measuring loop 13 in front of the heating element.
The gas-liquid separation assembly comprises a water diversion part 8 and a waterproof and breathable part 9 which are sequentially arranged along a measurement loop 13.
A flow sensor is also provided on the measurement circuit 13 after the hydrogen concentration sensor 11.
A pressure regulating member is also provided on the measurement circuit 13 after the hydrogen concentration sensor 11.
Wherein
The water diversion part 8 is an SMC type water diversion device, and can selectively remove liquid water particles in gas with the diameter larger than 50 um; the waterproof breathable piece 9 is a waterproof breathable valve, theoretically, only hydrogen, nitrogen, water vapor and other gases can pass through the waterproof breathable piece, liquid water particles cannot pass through the waterproof breathable piece, the aperture of an adopted e-PTFE film material is 0.1-10um, the liquid water particles are generally larger than the range, the diameter of gas molecules is 0.4nm, and due to the characteristics of high contact angle and the like of the film material, gas-water separation can be effectively realized.
EXAMPLE III
Referring to fig. 1, a vehicle includes a fuel cell including a control valve 1, a hydrogen circulation pump 2, an electromagnetic purge valve 3, a stack 4, a pressure regulating valve 5, and an air compressor 6, the hydrogen being introduced into the stack 4 through the control valve 1, the air being introduced into the stack 4 through the air compressor 6, the electromagnetic purge valve 3 controlling discharge of a reaction product, the pressure regulating valve 5 controlling a pressure of the stack 4; the hydrogen circulation pump 2 includes an inlet and an outlet,
the system also comprises a battery hydrogen concentration measuring system in the first embodiment;
a measuring loop 13 of the cell hydrogen concentration measuring system is connected in parallel with the inlet and the outlet of the hydrogen circulating pump 2;
one end of the measurement circuit 13 having the gas-liquid separation assembly is connected to the upper inlet.
The outlet of the hydrogen circulating pump 2 is used as the starting end of the measuring loop 13, the inlet of the hydrogen circulating pump 2 is used as the tail end, and the temperature and pressure sensor 7, the water diversion part 8, the waterproof ventilating part 9, the heating part 12, the temperature and pressure humidity sensor 10 and the hydrogen concentration sensor 11 are sequentially arranged from the starting end to the tail end of the measuring loop 13.
Example four
A medium on which a computer program is stored, which computer program, when executed by a processor, implements the method of measuring the hydrogen concentration of a fuel cell according to the first embodiment.
The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.
Claims (5)
1. A battery hydrogen concentration measuring system is characterized by comprising a measuring loop, and a gas-liquid separation component, a heating component, a temperature-pressure-humidity sensor and a hydrogen concentration sensor which are sequentially arranged on the measuring loop;
and a temperature and pressure sensor is arranged on a measuring loop in front of the heating element.
2. The battery hydrogen concentration measurement system according to claim 1, wherein the gas-liquid separation assembly includes a water diversion member and a waterproof gas permeable member that are provided in this order along the measurement circuit.
3. The battery hydrogen concentration measurement system according to claim 1, wherein a flow sensor is further provided on the measurement circuit after the hydrogen concentration sensor.
4. The battery hydrogen concentration measurement system according to claim 1, wherein a pressure regulator is further provided on the measurement circuit after the hydrogen concentration sensor.
5. A vehicle comprising a fuel cell including a hydrogen circulation pump including an inlet and an outlet, characterized by further comprising the cell hydrogen concentration measurement system of any one of claims 1 to 4;
the measuring loop of the cell hydrogen concentration measuring system is connected in parallel with the inlet and the outlet of the hydrogen circulating pump;
one end of the measurement loop with the gas-liquid separation assembly is connected with the upper inlet.
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| CN202120295445.2U CN214668365U (en) | 2021-02-02 | 2021-02-02 | Measuring system and vehicle of fuel cell hydrogen concentration |
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| CN202120295445.2U CN214668365U (en) | 2021-02-02 | 2021-02-02 | Measuring system and vehicle of fuel cell hydrogen concentration |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114441106A (en) * | 2022-01-28 | 2022-05-06 | 上海重塑能源科技有限公司 | Hydrogen concentration sensor with heating function and fuel cell system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114441106A (en) * | 2022-01-28 | 2022-05-06 | 上海重塑能源科技有限公司 | Hydrogen concentration sensor with heating function and fuel cell system |
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