Fuel cell air supply system based on waste heat and pressure utilization

Abstract

The invention provides a waste heat and pressure utilization-based fuel cell air supply system which comprises an organic Rankine cycle-based waste heat recycle loop and a pressurized air supply system, wherein the organic Rankine cycle-based waste heat recycle loop comprises an organic working medium pump, an expansion machine, an organic working medium pipeline and a condenser; the pressurized air supply system comprises a first control valve, a turbocharging bypass loop, a second control valve, a turbocharger, a first intercooler, a compressor, a second intercooler and a humidifier. According to the waste heat and pressure utilization-based fuel cell air supply system, the pressurized air supply system is used for recycling and converting the dynamic energy from the waste gas of a fuel cell into mechanical work which is used for driving the turbocharger to compress the external air for the first time; the air compressed for the first time is used as supply air compressed by the compressor; the organic Rankine cycle-based waste heat recycle loop is used for recycling and converting the waste heat from the electrochemical reaction of the fuel cell into mechanical work which is used for driving the compressor of the pressurized air supply system to compress the supply air.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a fuel cell air supply system based on utilization of waste heat and pressure. Background technique [0002] The fuel cell system consists of a fuel cell stack and auxiliary systems such as an air supply system, a hydrogen system, and a cooling system. The air supply system supplies air with certain pressure and humidity to the fuel cell stack, which is an important part of the fuel cell system. The performance of the air supply system has an important impact on the efficiency, volume, weight and transient response of the fuel cell system. The core component of the air supply system, the air compressor, is the main energy-consuming component of the fuel cell system, and consumes about 15% to 20% of the output power of the fuel cell stack, which has a great impact on the efficiency of the fuel cell system. [0003] There are two main driving modes of the existing fuel cell air compress...

AI Technical Summary

Problems solved by technology

The second method uses the exhaust energy of the fuel cell to drive the air compressor. Due to the low temperature of the exhaust gas of the fuel cell, its energy cannot meet the power demand of the air compressor, and the air compressor must be driven by the auxiliary motor to meet the air supply of the fuel cell. Require

Both driving methods need to consume a part of the output power of the fuel cell, resulting in a decrease in the net output power of the system

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