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Estimation method of exhaust hydrogen concentration of fuel cell system

A fuel cell system, hydrogen concentration technology, applied in the direction of fuel cells, circuits, electrical components, etc., can solve the problems of reduced sealing performance, low efficiency, etc., achieve low resolution dependence, high measurement accuracy, and wide applicability Effect

Active Publication Date: 2021-05-07
BEIJING SINOHYTEC
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Problems solved by technology

However, this estimation method is only based on the experimentally measured MAP diagram to deduce the amount of pumped hydrogen and the amount of hydrogen released, without considering other conditions, such as reduced sealing performance, and non-low-efficiency operating conditions

Method used

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  • Estimation method of exhaust hydrogen concentration of fuel cell system
  • Estimation method of exhaust hydrogen concentration of fuel cell system
  • Estimation method of exhaust hydrogen concentration of fuel cell system

Examples

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example 1

[0115] Use the experimental equipment and instruments described in the national standard GB / T 37154-2018 to implement the estimation method of the present invention, and measure the tail hydrogen concentration according to the method described in GB / T 37154-2018, compare the results, and use the measured value As a benchmark, calculate the absolute error between the two.

[0116] Among them, the estimation method is as follows:

[0117] S1: Obtain the instantaneous molar flow of hydrogen entering the stack 3 through the following steps

[0118] S101: Collect the input end pressure and output end pressure of the hydrogen flow control device 2 of the fuel cell system and the control signal of the controller 9 of the hydrogen flow control device 2 .

[0119] S102: According to the collected input pressure, output pressure and control signal, query the hydrogen flow MAP diagram of the pre-calibrated hydrogen instantaneous mass flow-the ratio of input pressure to output pressure...

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Abstract

The invention provides a fuel cell system exhaust hydrogen concentration estimation method, which comprises the following steps: S1, obtaining the instantaneous molar flow of hydrogen entering a galvanic pile; S2, collecting the flow of air entering the galvanic pile to obtain the instantaneous molar flow of air; S3, calculating the hydrogen consumption molar flow and the oxygen consumption molar flow consumed in real time according to the current, the air excess coefficient ratio and the voltage; S4, measuring the environment temperature and the environment pressure at the tail emission position, and obtaining the water vapor molar fraction at the tail emission position through calculation, wherein psat is the saturation pressure of water vapor, and patm is the environment pressure; S5, calculating the exhaust hydrogen concentration according to the following formula.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a method for estimating the concentration of hydrogen in tail exhaust of a fuel cell system. Background technique [0002] The working principle of the proton exchange membrane fuel cell is that hydrogen and oxygen undergo an electrochemical reaction to generate water and output electricity at the same time. Among them, hydrogen is a combustible gas, and when the volume concentration in the air is in the range of 4.0%-75.6%, it may explode when encountering a fire source. Therefore, it is very necessary for the safety of the system and personnel to keep the hydrogen concentration (tail hydrogen concentration) at the exhaust outlet of the fuel cell system always below the explosive concentration. [0003] With the long-term operation of the fuel cell system, the efficiency of the fuel cell stack is reduced and the potential hydrogen leakage, the sealing performance of the ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0444H01M8/04992
CPCH01M8/04462H01M8/04992Y02E60/50
Inventor 赵兴旺周鹏飞张国强贾能铀杨绍军
Owner BEIJING SINOHYTEC
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