IGFC system and method for producing oxygen by using cathode tail gas of high-temperature fuel cell

Abstract

The invention discloses an IGFC system and method for producing oxygen by using cathode tail gas of a high-temperature fuel cell. Raw coal is treated in a coal preparation unit and then sent to a gasification furnace, slag is generated at the bottom of the gasification furnace, high-temperature raw gas generated at the top of the gasification furnace is sent to a waste heat boiler, the raw gas with waste heat recovered by the waste heat boiler enters a hot side inlet of a first gas-gas heater, and the cold side outlet coal gas of the first gas-gas heater enters the anode of the high-temperature fuel cell as fuel gas for reaction; tail gas at the anode outlet of the high-temperature fuel cell is fed into a catalytic burner for combustion reaction, high-temperature and high-pressure gas is generated and fed into the waste heat boiler after acting through a gas turbine, and combustion tail gas is discharged into the atmosphere after being cooled; and tail gas at the cathode outlet of the high-temperature fuel cell is divided into two streams, one stream is sent to a high-temperature ion transport membrane technology oxygen production unit, oxygen is separated out and sent to a gasification furnace, and the other stream is sent to a catalytic combustor for combustion reaction. The oxygen production energy consumption is reduced, and the net power generation efficiency of the whole IGFC system can be improved.

Description

technical field [0001] The invention belongs to the field of coal power generation, and relates to an IGFC system and method for producing oxygen by using high-temperature fuel cell cathode tail gas. Background technique [0002] The cryogenic air separation system is the main energy consumption unit in the IGFC power generation system, and there is limited space for further reducing the energy consumption of the cryogenic air separation system. Therefore, exploring a new type of air separation technology is of great significance to reduce the power consumption and power generation cost of IGFC power generation system. High-temperature ion transport membrane technology is a new type of air separation technology developed in the past 20 years. It has developed rapidly due to its advantages of low investment, low energy consumption, and high purity of oxygen production (nearly 100%). The core of high-temperature ion transport membrane technology is a layer of non-porous, mixe...

AI Technical Summary

Problems solved by technology

The conventional high-temperature ion transport membrane technology process needs to be equipped with air compression and air heating links, the system is relatively complicated, and the energy consumption is relatively large

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