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Estimation Method of Hydrogen Concentration in Tail Exhaust of Fuel Cell System

A fuel cell system, hydrogen concentration technology, applied in fuel cells, circuits, electrical components, etc., can solve problems such as reduced sealing performance, low efficiency, etc., to achieve low resolution dependence, high measurement accuracy, increased cost and The effect of system complexity

Active Publication Date: 2022-01-28
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 Hydrogen Concentration in Tail Exhaust of Fuel Cell System
  • Estimation Method of Hydrogen Concentration in Tail Exhaust of Fuel Cell System
  • Estimation Method of Hydrogen Concentration in Tail Exhaust of Fuel Cell System

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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 present invention provides a method for estimating the hydrogen concentration at the tail of a fuel cell system. Current, air excess coefficient ratio and voltage calculation real-time consumption of hydrogen consumption molar flow rate and oxygen consumption molar flow rate S4: Measure the ambient temperature and ambient pressure at the tail row, and calculate the water vapor mole fraction at the tail row, where, p sat is the saturation pressure of water vapor, p atm is the ambient pressure; S5: Calculate tail 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 Patents(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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