Fuel cell air supply system based on waste heat utilization

Abstract

The invention provides a fuel cell air supply system based on waste heat utilization. The fuel cell air supply system comprises an organic working medium pump, a first heat exchanger, an expansion machine, a condenser, an air compressor and a humidifier. The organic working pump is communicated with an organic working medium liquid storage tank on the outside. A waste heat recycling and circulating loop based on organic Rankine cycle is formed by the organic working medium liquid storage tank, the organic working medium pump, the first heat exchanger, the expansion machine and the condenser. A pressurized air supply path is formed by the air compressor, the first heat exchanger and the humidifier. The organic working medium pump conveys the liquid organic working medium pump in the organic working medium liquid storage tank to the first exchanger. The first heat exchanger receives liquid organic working media conveyed by the organic working medium pump. Heat exchange is carried out between the liquid organic working media passing through the first heat exchanger and a fuel cell, so that the waste heat of the fuel cell is absorbed and the liquid organic working media are evaporated to gas organic working media, the gas organic working media enter the expansion machine and drive the expansion machine to act, and exhaust gas generated after acting enters the condenser and is cooled to be liquid and conveyed to the organic working medium liquid storage tank.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a fuel cell air supply system based on waste heat utilization. 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 compressor: 1) driven by...

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Problems solved by technology

[0004] Aiming at the problem of low system efficiency due to high power consumption of fuel cell air compressors, the present invention provides a fuel cell air supply system based on waste heat utilization, which can improve the net output power and system efficiency of the fuel cell system

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