A drain solenoid valve, fuel cell cold start system and cold start method

Abstract

The invention relates to a drain solenoid valve, a fuel cell cold start system and a cold start method. A diaphragm is arranged between the fluid entry channel and the fluid discharge channel of the drain solenoid valve and the valve stem, and the diaphragm prevents the fluid from entering the flow channel and fluid discharge The fluid in the runner enters the sliding gap formed between the valve stem and the valve seat; the cold start system includes a hydrogen bottle, a pressure reducer, a proportional valve, an ejector, a pressure sensor, an electric stack, a hydrogen circulation pump, a water separator, and a drain Gas pipe and controller; the cold start method includes: Step 1: The controller judges whether the fuel cell is below 0°C, and if so, executes Step S2; Step 2: The controller opens the drain solenoid valve and periodically adjusts the hydrogen pressure entering the stack , the controller records the pressure change period T of the pressure sensor, and judges whether to perform a cold start by judging the period T. Compared with the prior art, the cost and complexity are reduced, and the cold start time is reduced.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a drain solenoid valve, a fuel cell cold start system and a cold start method. Background technique [0002] A fuel cell is a power generation device that directly converts the chemical energy of fuel into electrical energy. The fuel cell system has high energy conversion efficiency and is an ideal energy utilization method. There is a broad prospect for commercial application. In practice, for an anode closed loop system, in order to avoid anode flooding, it is necessary to drain the anode liquid water regularly, usually using a drain solenoid valve to periodically drain the liquid water. [0003] In order to prevent the solenoid valve from freezing due to condensation at low temperatures after the system stops and affect the cold start performance of the system, most of the current methods are to increase the heating PTC (PTC ceramic heating element) through the solenoid valve, and st...

AI Technical Summary

Problems solved by technology

[0003] In order to prevent the solenoid valve from freezing due to condensation at low temperatures after the system stops and affect the cold start performance of the system, most of the current methods are to increase the heating PTC (PTC ceramic heating element) through the solenoid valve, and start heating the PTC before the system is cold started. After judging that the temperature of the solenoid valve exceeds the set threshold, the system is starting at low temperature; the heating power of the PTC is small, and the heating time is long; this technology increases the complexity, cost, parasitic power and start-up time of the system

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