Wide-power-spectrum multistage injection hydrogen circulation system

Abstract

The invention discloses a wide-power-spectrum multi-stage injection hydrogen circulation system which mainly comprises a high-pressure gas supply device, a multi-stage injection device, a control module and an electric pile valve group. High-pressure hydrogen is decompressed through a high-pressure gas supply device and led to a multi-stage injection device, the multi-stage injection device is composed of a plurality of single-stage injection ejector assemblies, each single-stage injection ejector assembly is composed of a hydrogen ejector set, a pressure transmitter and an ejector, and a control module controls the multi-stage injection ejector assembly by collecting operation parameters of the pressure transmitters and an electric pile. The control module is used for calculating the hydrogen flow required by the electric pile according to the power load, and selectively starting the stage number of single-stage injection ejectors in the multi-stage injection device and adjusting the pulse width of a hydrogen injector group through a control method of the control module so as to ensure that the fuel cell system can effectively operate at low, medium and high wide power load working condition points; and meanwhile, the problem that residual condensed water of the ejector is frozen when the environment temperature is low due to the fact that residual water vapor cold condensed water in the ejector cannot be discharged is solved.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a wide power spectrum multi-stage ejection hydrogen circulation system. Background technique [0002] With the continuous growth of the national economy and the increasingly high requirements for environmental protection, automobile exhaust is one of the main factors of the global greenhouse effect. New energy vehicles can greatly reduce the carbon emissions of automobile exhaust, and also in the energy transition play an important role. In the fuel cell system, the hydrogen supply system is currently mainly divided into two methods: anode closed-end and hydrogen circulation. The hydrogen circulation can be further divided into hydrogen pump circulation and ejector circulation. The ejector is widely used because of its advantages of low processing difficulty and low energy consumption. Although the traditional ejector can achieve good ejection effect under high-power and high-flow c...

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Problems solved by technology

[0007] In view of the above-mentioned problems, the object of the present invention is to provide a wide power spectrum multi-stage injection hydrogen circulation system, so that the injector can have enough injection in the range of low, medium and high power in the fuel cell system. ratio, and maintain the required excess hydrogen coefficient, and at the same time solve the problem that the residual water vapor and condensed water in the ejector cannot be discharged, resulting in the freezing of the residual condensed water in the ejector when the ambient temperature is low

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