Method and device for detecting a leakage rate of a solid oxide fuel cell system

Patent metadata

Field	Value
Publication number	US-2023296469-A1
Application number	US-202117928686-A
Country	US
Kind code	A1
Filing date	Jun 29, 2021
Priority date	Jun 30, 2020
Publication date	Sep 21, 2023
Grant date	—

Abstract

The invention discloses a method and device for detecting a leakage rate of a solid oxide fuel cell system on line. The method comprises steps of: cutting off fuel gas supply of an anode cavity, cutting off an exhaust line of the anode cavity and cutting off high-pressure air supply of a cathode cavity in the operation process of a solid oxide fuel cell; obtaining an open-circuit voltage and temperature of the solid oxide fuel cell; and determining a leakage rate of the solid oxide fuel cell system according to the open-circuit voltage and the temperature of the solid oxide fuel cell. Based on the technical solutions disclosed by the invention, the leakage rate of the solid oxide fuel cell system can be detected on line.

First claim

1 . A method for detecting a leakage rate of a solid oxide fuel cell system on line, wherein the solid oxide fuel cell system comprises a solid oxide fuel cell, an anode cavity arranged on an anode side of the solid oxide fuel cell, and a cathode cavity arranged on a cathode side of the solid oxide fuel cell, wherein the method comprises:
ceasing fuel gas supply to the anode cavity, closing an exhaust line of the anode cavity, and ceasing high-pressure air supply to the cathode cavity in the operation process of the solid oxide fuel cell; obtaining an open-circuit voltage and temperature of the solid oxide fuel cell; and determining a leakage rate of the solid oxide fuel cell system according to the open-circuit voltage and the temperature of the solid oxide fuel cell.

2 . The method according to claim 1 , wherein determining a leakage rate of the solid oxide fuel cell system according to the open-circuit voltage and the temperature of the solid oxide fuel cell comprises:
calculating the leakage rate of the solid oxide fuel cell system according to

dm

(
Air
)

dt

=

e

-

dV

a
*

⁢
dt

-
c

b

;

where

dm

(
Air
)

dt

is the leakage rate of the solid oxide fuel cell system,
V is the open-circuit voltage of the solid oxide fuel cell,

a
=

RT

4
⁢
F

,

b
=

0.21
RT

?

,

c
=

?

?

,

?

indicates text missing or illegible when filed

R is the molar gas constant,
T is the temperature of the solid oxide fuel cell,
F is the Faraday constant,
M o 2 is the molar mass of oxygen,
V a is the volume of the anode cavity,
P o 2 o 2 is the oxygen partial pressure of the cathode cavity,
P o 2 a 2 is the oxygen partial pressure of the anode cavity in a non-leaking state, and
m (Air) is the mass of leaking air.

3 . The method according to claim 1 , wherein determining a leakage rate of the solid oxide fuel cell system according to the open-circuit voltage and the temperature of the solid oxide fuel cell comprises:
obtaining a pre-established correspondence between the open-circuit voltage and the temperature of the solid oxide fuel cell and the leakage rate; and determining a leakage rate corresponding to the open-circuit voltage and the temperature of the solid oxide fuel cell according to the obtained correspondence between the open-circuit voltage and the temperature of the solid oxide fuel cell and the leakage rate.

4 . The method according to claim 1 , wherein after obtaining an open-circuit voltage and temperature of the solid oxide fuel cell, the method further comprises:
when the open-circuit voltage of the solid oxide fuel cell is greater than a preset voltage threshold, implementing the step of determining a leakage rate of the solid oxide fuel cell system according to the open-circuit voltage and the temperature of the solid oxide fuel cell; or when the open-circuit voltage of the solid oxide fuel cell is less than or equal to the preset voltage threshold, determining that a leakage occurs to the solid oxide fuel cell system.

5 . The method according to claim 4 , further comprising:
outputting a prompt message if the open-circuit voltage of the solid oxide fuel cell is less than or equal to the preset voltage threshold.

6 . A device for detecting a leakage rate of a solid oxide fuel cell system on line, the solid oxide fuel cell system comprising a solid oxide fuel cell, an anode cavity arranged on an anode side of the solid oxide fuel cell, and a cathode cavity arranged on a cathode side of the solid oxide fuel cell, wherein the device comprises:
a temperature sensor for detecting the temperature of the solid oxide fuel cell; a voltage sensor for detecting the open-circuit voltage of the solid oxide fuel cell; and a controller connected to the temperature sensor and the voltage sensor; wherein the controller is operable to: cease fuel gas supply to the anode cavity, close an exhaust line of the anode cavity, and cease high-pressure air supply of the cathode cavity in the operation process of the solid oxide fuel cell; obtain an open-circuit voltage and temperature of the solid oxide fuel cell; and determine a leakage rate of the solid oxide fuel cell system according to the open-circuit voltage and the temperature of the solid oxide fuel cell.

7 . The device according to claim 6 , wherein the controller is operable to determine a leakage rate of the solid oxide fuel cell system according to the open-circuit voltage and the temperature of the solid oxide fuel cell, wherein the controller is configured to calculate the leakage rate of the solid oxide fuel cell system according to

dm

(
Air
)

dt

=

e

-

dV

a
*

⁢
dt

-
c

Assignees

• Ceres Ip Co Ltd

Inventors

• Sun Chuanxin
• Sun Lei
• Zheng Xiaoguang

Classifications

• H01M8/0432 Primary

  Temperature; Ambient temperature · CPC title

• H01M8/04671 Primary

  of the individual fuel cell · CPC title

• H01M8/04089 Primary

  of gaseous reactants · CPC title

• G01M3/40 Primary

  by using electric means, e.g. by observing electric discharges · CPC title

• H01M8/04544

  Voltage · CPC title