Preheating clean synthesis gas method and system for improving IGCC (integrated gasification combined cycle) power generation facility performances

Abstract

The invention discloses a preheating clean synthesis gas method and a preheating clean synthesis gas system for improving IGCC (integrated gasification combined cycle) power generation facility performances. A preheating synthesis gas device for improving the IGCC power generation facility performances is arranged, and is arranged at an air separating mechanism in the IGCC power generation facility; an oxygen boosting unit of the air separating mechanism is utilized to compress oxygen generated by the air separating mechanism to form high-temperature high-pressure oxygen; the clean synthesis gas is conveyed to a heat exchanger by a clean synthesis gas pipeline; and the heat exchanger is used for adsorbing the heat of the high-temperature high-pressure oxygen to preheat the clean synthesis gas. According to the preheating clean synthesis gas method and the preheating clean synthesis gas system for improving IGCC power generation facility performances, the heat generated by compressing O2 in the air separating mechanism is effectively utilized, and the clean synthesis gas of the IGCC power generation facility is preheated by the heat in the O2 compressing process through the preheating clean synthesis device, thus not only improving the performances such as efficiency of the IGCC power generation facility, but also avoiding the high-temperature sulphidation corrosion of the turbine of a gas turbine device caused by the fact that coarse synthesis gas is blended into the clean synthesis gas, and ensuring the safe operation of the IGCC power generation facility.

Description

technical field [0001] The invention relates to a method and system for preheating clean syngas for improving the performance of IGCC power generation facilities, and belongs to the technical field of electric power generation. Background technique [0002] The integrated gasification combined cycle (IGCC) power generation facility is a device that converts solid or liquid fuel into combustible syngas (Syngas), and then uses the syngas to generate power in a gas-steam combined cycle system. IGCC power generation facilities can include gasification island and power island. The functions of the gasification island include producing crude syngas, recovering the heat of high-temperature crude syngas to generate water vapor, dedusting and purifying the crude syngas, and then preheating the purified clean syngas. The role of the power island is to receive clean syngas from the gasification island and use the gas-steam combined cycle system to generate power. A power island may t...

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Problems solved by technology

[0007] However, the disadvantage of this method is that when the high-temperature crude synthesis gas is used to preheat the clean synthesis gas, the safety of IGCC power generation facilities will be reduced. The desulfurized crude syngas is mixed with clean syngas and then enters the gas turbine unit, which eventually leads to high-temperature sulfidation and corrosion problems in the turbine of the gas turbine unit

In IGCC power generation facilities, the high-temperature and high-pressure steam produced by the radiant cooler and the convective cooler can be sent to the steam turbine device to generate power. When cleaning the syngas, since the temperature of high-temperature water or water vapor is significantly reduced after passing through the clean syngas heat exchanger, the energy carried by it into the HRSG heat exchanger and the steam turbine unit is reduced, which will lead to the power generation of the steam turbine, The reduction of the total power generation of IGCC power generation facilities and the decrease of the overall efficiency of IGCC power generation facilities at the same time

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