Fuel cell medium-pressure hydrogen steady-state cyclic utilization system

Abstract

The invention belongs to the technical field of fuel cells, and particularly discloses a fuel cell medium-pressure hydrogen steady-state cyclic utilization system which comprises a pressure reducing valve, a proportional valve, a hydrogen inlet valve, a fuel cell and a water-vapor separator which are sequentially connected through a pipeline. The water-vapor separator is provided with a gas outletand a liquid outlet, the gas outlet is connected with an inlet of the hydrogen inlet valve through a recycling pipeline, and a buffer tank and a circulating pump are sequentially arranged on the recycling pipeline. The liquid outlet is communicated with a drainage pipeline, and a water storage tank and a drainage valve are sequentially arranged on the drainage pipeline. The buffer tank is also communicated with a hydrogen discharging pipeline provided with an auxiliary valve. The hydrogen utilization rate is high, and the circulating pump power consumption is low. The recycled hydrogen is controllable in humidity and high in purity. The hydrogen recycling pipeline is good in stability, and long-term steady-state supply of hydrogen can be achieved.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a system for steady-state recycling of medium-pressure hydrogen in fuel cells. Background technique [0002] Hydrogen fuel cell is a power generation device that directly converts the chemical energy of hydrogen and oxygen into electrical energy. It has the characteristics of high energy density, high conversion efficiency, fast response speed, light weight, and small size. It is a new type of power with broad application prospects. source. The basic principle of a hydrogen fuel cell is the reverse reaction of electrolyzing water. Hydrogen and oxygen are supplied to the anode and cathode of the fuel cell respectively. The hydrogen gas is passed into the anode flow channel and dissociated into protons and electrons under the action of the catalyst. The protons reach the anode through the proton exchange membrane. At the cathode of the battery, the electrons are col...

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Problems solved by technology

In the process of recycling hydrogen, the utility model separates and circulates the water vapor in the hydrogen for the second time, avoiding water accumulation in the pipeline, but the humidity of the reused hydrogen is too low to wet the proton exchange membrane to improve the operation performance of the fuel cell In actual production, it is often necessary to install another humidification device, which increases the cost; moreover, this system cannot solve the problem of high workload and short service life of the circulating pump.

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