Gasification power generation plant

Abstract

A gasifier (101) that has a fluid communication channel (131) that communicates a fluid, which undergoes heat exchange in the furnace, and that generates syngas by gasifying fuel; gas purifying equipment that removes impurities contained in the syngas generated by the gasifier (101); a gas turbine that is driven by the gas purified by the gas purifying equipment; and a heat exchanger that heats a fluid with exhaust expelled from the gas turbine are provided, and the fluid heated by the heat exchanger is supplied to the fluid communication channel (131) by being pressurized by pressurizing gas when performing warm-up of the gasifier (101).

Description

technical field [0001] The invention relates to gasification power generation equipment, in particular to the preheating operation of a gasification furnace. Background technique [0002] In general, in a coal gasification power plant, a gasifier gasifies coal to form a product gas, and the generated gas drives a gas turbine to generate electricity from a generator connected to the gas turbine. During the start-up operation of coal gasification power generation equipment, starting fuel such as light oil or natural gas is burned in the gasifier to start, and the sulfur component contained in the product gas generated from the starting fuel causes the gasification furnace to be depleted. In order to prevent acid dew point corrosion of walls, economizers, evaporators, etc., or solidification of dust in the generated gas, the inside of the gasifier is preheated (heated) above the dew point temperature. [0003] Patent Document 1 discloses a technique of preheating the inside of...

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Problems solved by technology

[0007] However, in the invention described in Patent Document 1, when the pressure of the water in the wall of the gasifier, the economizer, and the evaporator is low during the preheating of the gasifier, due to the water flowing toward the wall of the gasifier, , Economizer, evaporator water supply boiler water circulation circuit supplies high-temperature water, which may cause overflow phenomenon (decompression boiling) in the boiler water circulation circuit, resulting in corrosion or excessive flow rate

In order to prevent corrosion or excessive flow velocity, it is necessary to set an upper limit on the flow rate of high-temperature water supplied to the boiler water circulation path, so there is a problem that the warm-up time of the gasifier cannot be shortened, and the operability of the coal gasification power plant cannot be improved.

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