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A low-temperature self-starting method for a fuel cell system

A fuel cell system and fuel system technology, applied in the direction of fuel cells, circuits, electrical components, etc., can solve the problems of fuel cell start-up difficulties, and achieve the effects of convenient operation, simple system strategy, and low-temperature start-up

Active Publication Date: 2021-08-20
SHANGHAI SHENLI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a low-temperature self-starting method for a fuel cell system in order to overcome the above-mentioned defects in the prior art, which is used to solve the problem of difficulty in starting the fuel cell in a low-temperature environment

Method used

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  • A low-temperature self-starting method for a fuel cell system
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  • A low-temperature self-starting method for a fuel cell system

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Embodiment 1

[0048] Such as figure 2 A low-temperature self-starting device for a fuel cell system shown includes a fuel cell stack 7 , an oxidant system, a fuel system, a power control system, and a single-chip voltage monitor 20 .

[0049] Among them, the oxidant system includes an oxidant filter 1, an oxidant flow meter 2, a compressor 3, an oxidant inlet throttle valve 4, an oxidant humidifier 5, an oxidant inlet temperature and pressure integrated sensor 6, an oxidant outlet temperature and pressure integrated sensor 8, an oxidant outlet Gas throttle valve 9, mixed exhaust pipe 16;

[0050] The connection sequence is as follows: the oxidant filter 1, the oxidant flow meter 2, the compressor 3, and the oxidant intake throttle 4 are arranged in series in sequence, and the dry gas inlet and outlet of the oxidant humidifier 5 are respectively connected to the middle of the oxidant intake throttle 4. The outlet of the cooler is connected with the cathode inlet of the fuel cell stack 7, a...

Embodiment 2

[0077] Such as figure 1 A fuel cell system low-temperature self-starting method based on the fuel cell system low-temperature self-starting device in Embodiment 1 shown, including

[0078] 1) Open the purge branch and perform anode purge on the fuel cell stack 7, then close the purge branch and open the circulation branch;

[0079] 2) Set the cycle temperature threshold, the end point temperature threshold, and the starting current, and adjust the operating speed of the compressor 3 to match the first starting current;

[0080] 3) Start or shut down the compressor 3 intermittently, that is, the compressor 3 runs for 3 seconds, then shuts down for 2 seconds, then restarts and runs for 3 seconds, then shuts down for 2 seconds. This cycle increases the current of the fuel cell stack 7 from zero to the starting current Then reduce to zero, the voltage gradually increases from zero to the starting voltage corresponding to the starting current and then decreases to zero until the o...

Embodiment 3

[0089] In this embodiment, the cycle temperature thresholds are respectively -20°C and -15°C; the end point temperature thresholds are -15°C; the starting currents are 50A and 100A respectively.

[0090]In step 1), during the anode purge process, the purge pressure is 40kPa, and the purge time is 8s;

[0091] After the circulation branch is opened, the anode fuel pressure is 40kPa;

[0092] In step 3), the running time of the compressor 3 is 5s and the closing time is 2.5s during the intermittent startup and shutdown process.

[0093] All the other are with embodiment 2.

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Abstract

The invention relates to a low-temperature self-starting method for a fuel cell system. The device used includes a fuel cell stack, an oxidant system, and a fuel system. The low-temperature self-starting method includes: feeding fuel into the fuel cell stack through the fuel system, and controlling the oxidant The system intermittently feeds oxidant into the fuel cell stack to make the fuel cell stack work at low voltage to generate heat, thereby realizing low-temperature start-up. Compared with the prior art, the present invention has convenient operation and simple system strategy. It only needs to control the intermittent startup or shutdown of the compressor, and adjust the starting current through the load controller to realize high-power heat generation, so that at lower temperatures, such as ‑30℃ to achieve self-starting.

Description

technical field [0001] The invention belongs to the technical field of fuel cell systems, and relates to a low-temperature self-starting method for a fuel cell system. Background technique [0002] A proton exchange membrane fuel cell (PEMFC), also called a polyelectrolyte fuel cell (PEFC), is a device that directly converts the chemical energy of a reducing agent and an oxidizing agent into electrical energy. When a fuel cell is in use, it usually requires a set of corresponding auxiliary systems, mainly including hydrogen system, air system, cooling system, power output system, voltage detection system and other accessory systems, which constitute the fuel cell engine system as a whole. Among them, the hydrogen system provides hydrogen for the fuel cell stack, and adjusts the pressure and flow of hydrogen entering the stack according to the operating conditions; the air system provides an appropriate amount of oxidant (air or oxygen) for the stack, and adjusts the hydrogen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/04223H01M8/04225H01M8/04701
CPCH01M8/04268H01M8/04708H01M8/04738H01M8/04225Y02E60/50
Inventor 徐鑫甘全全戴戚
Owner SHANGHAI SHENLI TECH CO LTD
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