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

A fuel cell and air supply technology, which is applied in the direction of fuel cells, electrical components, circuits, etc., can solve the problems of system net output power reduction, energy cannot meet the power demand of air compressor, and exhaust temperature is low, so as to improve net The effect of output power, compact structure and high practicability

CN104485469BActive Publication Date: 2016-08-24TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2016-08-24

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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.
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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...

Examples

Embodiment Construction

[0022] The fuel cell air supply system based on utilization of waste heat and pressure according to the present invention will be described in detail below with reference to the accompanying drawings.

[0023] refer to figure 1 According to the present invention, the fuel cell air supply system based on waste heat and pressure utilization includes: a waste heat recovery loop 1 based on an organic Rankine cycle, and a pressurized air supply system 2 . The waste heat recovery loop 1 based on the Organic Rankine cycle comprises: an organic working medium pump 11, connected to an external organic working medium liquid storage tank (not shown); an expander 12, arranged downstream of the organic working medium pump 11 and controlled Connected to the organic working medium pump 11; the organic working medium pipeline 13, one end communicates with the organic working medium pump 11 and the other end communicates with the expander 12 and passes through the fuel cell 4, the liquid organ...