CN-122000386-A - Method and device for monitoring anode stoichiometric ratio of hydrogen fuel cell

CN122000386ACN 122000386 ACN122000386 ACN 122000386ACN-122000386-A

Abstract

The application discloses a method and a device for monitoring the anode stoichiometric ratio of a hydrogen fuel cell. The method comprises the steps of monitoring gas parameters of different points of the hydrogen fuel cell, including monitoring total flow qA of a new hydrogen supply point, monitoring hydrogen concentration cB of a recirculation loop point and hydrogen concentration cC of an anode inlet point, calculating total flow qB of the recirculation loop point, calculating hydrogen flow qBH of the recirculation loop point according to the total flow qB of the recirculation loop point and the hydrogen concentration cB of the recirculation loop point, calculating hydrogen flow qAH of the new hydrogen supply point according to the total flow qA of the new hydrogen supply point and the hydrogen concentration cA of the new hydrogen supply point, calculating hydrogen flow qCH2 of the anode inlet point according to the hydrogen flow qAH2 of the new hydrogen supply point and the hydrogen flow qBH of the recirculation loop point, and calculating anode stoichiometric ratio lambda according to the hydrogen flow qCH2 of the anode inlet point and electric quantity generated by the hydrogen fuel cell. By the method, accurate anode stoichiometric ratio can be obtained, and reliable basis is provided for optimizing battery operation.

Inventors

LIU BO
Erro Andresson Ahma Thiene
Amir Ahmed Zadgan

Assignees

康明斯东亚研发有限公司

Dates

Publication Date: 20260508
Application Date: 20260204

Claims (13)

1. A method of monitoring the anode stoichiometry of a hydrogen fuel cell comprising: Monitoring gas parameters of different points of the hydrogen fuel cell, including monitoring total flow rate qA of a new hydrogen supply point, monitoring hydrogen concentration cB of a recirculation loop point, and monitoring hydrogen concentration cC of an anode inlet point; calculating the total flow qB of the point position of the recirculation loop; calculating the hydrogen flow qBH of the recirculation loop point according to the total flow qB of the recirculation loop point and the hydrogen concentration cB of the recirculation loop point; calculating the hydrogen flow qAH of the new hydrogen supply point according to the total flow qA of the new hydrogen supply point and the hydrogen concentration cA of the new hydrogen supply point; Calculating the hydrogen flow qCH2 of the anode inlet point according to the hydrogen flow qAH2 of the new hydrogen supply point and the hydrogen flow qBH of the recirculation loop point; The anode stoichiometric ratio lambda is calculated from the hydrogen flow qCH2 at the anode inlet point and the amount of electricity generated by the hydrogen fuel cell.
2. The hydrogen fuel cell anode stoichiometric ratio monitoring method according to claim 1, characterized in that calculating the total flow qB at the recirculation loop point, comprises: and obtaining the hydrogen concentration cA of the new hydrogen supply point, and calculating the total flow qB of the recirculation loop point according to the total flow qA of the new hydrogen supply point, the hydrogen concentration cA of the new hydrogen supply point, the hydrogen concentration cB of the recirculation loop point and the hydrogen concentration cC of the anode inlet point.
3. The method of monitoring the anode stoichiometric ratio of a hydrogen fuel cell according to claim 2, wherein calculating the total flow rate qB of the recirculation loop point based on the total flow rate qA of the new hydrogen supply point, the hydrogen concentration cA of the new hydrogen supply point, the hydrogen concentration cB of the recirculation loop point, and the hydrogen concentration cC of the anode inlet point, comprises: And calculating the total flow qB of the recirculation loop point according to the fact that the hydrogen flow qCH2 of the anode inlet point is equal to the sum of the hydrogen flow qAH of the new hydrogen supply point and the hydrogen flow qBH of the recirculation loop point, and the total flow qC of the anode inlet point is equal to the sum of the total flow qA of the new hydrogen supply point and the total flow qB of the recirculation loop point, wherein qCH2 = qC.cc, qAH = qa.ca, qBH = qB.cb.
4. The method for monitoring the anode stoichiometric ratio of a hydrogen fuel cell according to claim 1, wherein calculating the anode stoichiometric ratio λ from the hydrogen flow rate qCH2 at the anode inlet point and the amount of electricity generated by the hydrogen fuel cell comprises: And calculating the hydrogen supply mass mCH2 of the anode inlet point according to the hydrogen flow qCH2 of the anode inlet point, calculating the hydrogen consumption mass M of the hydrogen fuel cell according to the electric quantity generated by the hydrogen fuel cell, and calculating the anode stoichiometric ratio lambda according to the hydrogen supply mass mCH2 of the anode inlet point and the hydrogen consumption mass M of the hydrogen fuel cell.
5. The hydrogen fuel cell anode stoichiometric ratio monitoring method of claim 1, wherein a first end of the recirculation loop is connected to the cathode of the hydrogen fuel cell via a cathode line and a second end of the recirculation loop is connected to the anode of the hydrogen fuel cell via an anode line.
6. The hydrogen fuel cell anode stoichiometric monitoring method of claim 5, wherein the recirculation loop point is located on the recirculation loop.
7. The hydrogen fuel cell anode stoichiometric ratio monitoring method of claim 5, wherein the recirculation loop point is located on the cathode tube and the recirculation loop point is located between a first end of the recirculation loop and a cathode of the hydrogen fuel cell.
8. The hydrogen fuel cell anode stoichiometric ratio monitoring method of claim 5, wherein the recirculation loop point is located on the cathode tube and the first end of the recirculation loop is located between the recirculation loop point and a cathode of the hydrogen fuel cell.
9. The hydrogen fuel cell anode stoichiometric ratio monitoring method of claim 5, wherein the new hydrogen supply point is located on the anode line and the second end of the recirculation loop is located between the new hydrogen supply point and the anode of the hydrogen fuel cell.
10. The hydrogen fuel cell anode stoichiometric ratio monitoring method of claim 5, wherein the anode inlet point is located on the anode line and the anode inlet point is located between the second end of the recirculation loop and an anode of the hydrogen fuel cell.
11. A hydrogen fuel cell anode stoichiometric ratio monitoring apparatus, comprising: A memory for storing a computer program; a processor for executing a computer program stored in the memory to cause the apparatus to perform the method of any one of claims 1-10.
12. A computer program product comprising computer program code for performing the method of any of claims 1 to 10 when the computer program code is run on a computer.
13. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program code which, when executed by a processor, implements the method according to any of claims 1-10.

Description

Method and device for monitoring anode stoichiometric ratio of hydrogen fuel cell Technical Field The application relates to the technical field of hydrogen fuel cells, in particular to a method and a device for monitoring the anode stoichiometric ratio of a hydrogen fuel cell. Background The anode stoichiometric ratio (Anode Stoichiometric Ratio, ASR) of a hydrogen fuel cell refers to the ratio of the actual hydrogen supply to the hydrogen consumption at which the stack chemically reacts. The stoichiometric ratio of the anode is a key parameter for determining the operation state of the fuel cell and how the anode should be controlled, and is generally dynamically adjusted according to the working conditions of the load, the operation temperature and the like of the electric pile so as to ensure that the hydrogen on the anode side of the electric pile is fully supplied, and avoid the reduction of reaction efficiency or the attenuation of the performance of the electric pile caused by the insufficient hydrogen supply. Hydrogen fuel cells are typically equipped with a recycling system in order to recover the hydrogen unreacted at the anode and to increase the hydrogen utilization. In a fuel cell system having a recirculation system, the actual supply of hydrogen gas includes two parts, fresh hydrogen gas, hydrogen gas recovered through a recirculation loop. However, the gas recovered in the recirculation circuit is a mixed gas, and nitrogen, water vapor, and the like are present in addition to hydrogen, and thus the mixed gas is actually supplied at the anode inlet. Currently, for hydrogen fuel cells equipped with a recirculation system, the hydrogen content of the mixed gas at the anode inlet cannot be easily measured by one sensor, which makes it difficult to obtain the anode stoichiometric ratio. Disclosure of Invention The application provides a method and a device for monitoring the anode stoichiometric ratio of a hydrogen fuel cell, so as to obtain the anode stoichiometric ratio of the hydrogen fuel cell and provide a reliable basis for the optimized operation of the hydrogen fuel cell. In a first aspect, the present application provides a method for monitoring the anode stoichiometric ratio of a hydrogen fuel cell, comprising the steps of: Monitoring gas parameters of different points of the hydrogen fuel cell, including monitoring total flow rate qA of a new hydrogen supply point, monitoring hydrogen concentration cB of a recirculation loop point, and monitoring hydrogen concentration cC of an anode inlet point; calculating the total flow qB of the point position of the recirculation loop; calculating the hydrogen flow qBH of the recirculation loop point according to the total flow qB of the recirculation loop point and the hydrogen concentration cB of the recirculation loop point; calculating the hydrogen flow qAH of the new hydrogen supply point according to the total flow qA of the new hydrogen supply point and the hydrogen concentration cA of the new hydrogen supply point; Calculating the hydrogen flow qCH2 of the anode inlet point according to the hydrogen flow qAH2 of the new hydrogen supply point and the hydrogen flow qBH of the recirculation loop point; The anode stoichiometric ratio lambda is calculated from the hydrogen flow qCH2 at the anode inlet point and the amount of electricity generated by the hydrogen fuel cell. In a specific embodiment, calculating the total flow qB of the recirculation loop point comprises obtaining the hydrogen concentration cA of the new hydrogen supply point, and calculating the total flow qB of the recirculation loop point according to the total flow qA of the new hydrogen supply point, the hydrogen concentration cA of the new hydrogen supply point, the hydrogen concentration cB of the recirculation loop point and the hydrogen concentration cC of the anode inlet point. In a specific embodiment, calculating the total flow qB of the recirculation loop point based on the total flow qA of the new hydrogen supply point, the hydrogen concentration cA of the new hydrogen supply point, the hydrogen concentration cB of the recirculation loop point, and the hydrogen concentration cC of the anode inlet point includes calculating the total flow qB of the recirculation loop point based on the total flow qCH2 of the anode inlet point equal to the sum of the hydrogen flow qAH of the new hydrogen supply point and the hydrogen flow qBH2 of the recirculation loop point, the total flow qC of the anode inlet point equal to the sum of the total flow qA of the new hydrogen supply point and the total flow qB of the recirculation loop point, wherein qCH2=qC·cC, qAH2 =qA·cA, qBH2 =qB·cB. In a specific embodiment, the calculation of the anode stoichiometric ratio lambda from the hydrogen flow qCH2 at the anode inlet point and the amount of electricity generated by the hydrogen fuel cell comprises calculating the hydrogen supply mass mCH2 at the anode inlet point from the hydrogen flow