Method for integrally starting and stopping integrated gasification combined cycle (IGCC) power station

Abstract

The invention discloses a method for integrally starting and stopping an integrated gasification combined cycle (IGCC) power station. An air separation backup system outsourcing liquid nitrogen is used for large air density work and gasification furnace preheating temperature rise work, the air separation start time is postponed, and the air separation outsourcing power electricity cost is reduced. When a gas turbine has the proper synthesis gas condition, purified synthesis gas just has the delivery condition, gasification shutdown and unit splitting are well linked, the shutdown time is formulated according to the planned splitting time, coal feeding is controlled in advance, and pulverized coal is just burnt out during shutdown. After a gasification furnace is shut down, nitrogen replacement is carried out for three times and then air separation is stopped. The nitrogen of the air separation backup system is used for converting ash into residual pulverized coal. According to the method for integrally starting and stopping the IGCC power station provided by the invention, the overall start-stop time of the IGCC power station is shortened, and seamless connection is realized. Start-stop material consumption of a unit is reduced, and start-stop cost is reduced.

Description

technical field [0001] The invention relates to the technical field of clean coal-fired power generation, in particular to an overall start-up and stop method of an IGCC power station. Background technique [0002] IGCC power station, that is, integrated coal gasification combined cycle power generation system, is an advanced power system that combines coal gasification technology and efficient combined cycle. Oxygen and pulverized coal produced by the air separation unit are used for incomplete combustion reaction in the gasifier to generate synthesis gas. After purification, the synthesis gas is burned as fuel gas in the gas turbine to drive the generator, and the high-temperature gas after combustion enters the waste heat boiler. The water is heated to generate steam that works in a steam turbine to drive a generator. [0003] Compared with conventional gas turbines, the IGCC power station has a longer process. It not only has a gas-fired combined cycle power generation ...

AI Technical Summary

Problems solved by technology

It takes about 60 hours to start and stop for a long time. During the start and stop process, there is a large amount of material consumption, no output, and the start and stop costs are relatively high.

[0004] Even if adequate preparations and tests are made before start-up, incidents of equipment failure affecting the normal start-up of the unit during the official start-up process may occur from time to time, and failure of key equipment will lead to delays in grid connection, and even cause unit startup failures that cannot be connected to the grid as planned

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