720-DEG C efficient ultra-supercritical secondary reheating power plant boiler

Abstract

The invention provides a 720-DEG C efficient ultra-supercritical secondary reheating power plant boiler and relates to a high-efficiency, safe, low-emission and low-manufacturing-cost 720-DEG C efficient ultra-supercritical secondary reheating power plant boiler which is used in a coal fired power station and matched with a parameter-optimized 720-DEG C efficient ultra-supercritical secondary reheating turboset. The parameters of a main steam inlet at a boiler side are optimized as 590 DEG C and 42MPa; primary reheating steam parameters are optimized as 723 DEG C and 10.5MPa; secondary reheating steam parameters are optimized as 603 DEG C and 2.1MPa; a tail smoke channel is divided into a front smoke channel, a middle smoke channel and a rear smoke channel by separation walls; hot primary air regulation baffles of an ejector are positioned in the boiler and are opened when in low load; by virtue of controlling the opening and use quantity of the hot primary air regulation baffles of the ejector, primary reheating steam temperature is maintained at a rated value within a BMCR (Boiler Maximum Continuous Rating) interval of 40%-100%; by virtue of changing the use sequence and use quantity of tempering air-smoke ejectors along the furnace width direction, the thermal deviation of a high-temperature surface along the furnace width direction can be compensated and reduced.

Description

(1) Technical field: [0001] The invention relates to a 720°C high-efficiency ultra-supercritical secondary reheat power plant boiler, which relates to a high-efficiency, safe, low-emission, Low-cost 720°C high-efficiency ultra-supercritical double-reheat power plant boiler. (two) background technology: [0002] So far, there are four 700°C ultra-supercritical coal-fired power generation technology development plans being implemented in the world: [0003] The 17-year plan of AD700 in Europe (1998~2014); the 9-year plan of A-USC in Japan (2008~2016); the 15-year plan of A-USC in the United States (2001~2015); Supercritical power generation technology development roadmap (2010~2015), roadmap target parameters: pressure ≥ 35MPa, temperature ≥ 700 ℃, unit capacity ≥ 600MW, construction started in 2015. Without exception, these plans have encountered various difficulties, and it is difficult to see demonstration units put into commercial operation before 2020. [0004] For the...

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Problems solved by technology

[0013] The 700°C / 723°C / 723°C secondary reheat boiler main steam temperature adjustment method in the research and development of the existing technology will continue to use coal-water ratio + water spray temperature reduction + swing burner; primary reheat steam temperature and secondary reheat steam The method of temperature regulation is not yet clear

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