Circulating fluidized bed boiler of flue gas recirculation comprehensive efficient utilization, and operation method

Abstract

The invention discloses a circulating fluidized bed boiler of flue gas recirculation comprehensive efficient utilization. The boiler comprises a flue gas recirculation system. The flue gas recirculation system comprises a flue gas recirculation parent pipe. The flue gas recirculation parent pipe is provided with a first recirculation branch pipe, a second recirculation branch pipe and a third recirculation branch pipe. The first recirculation branch pipe penetrates into a first fluidization wind chamber. Wind in the second recirculation branch pipe is transferred to a return feeder through a material return wind branch pipe, a coal spreading wind branch pipe and a lubricating wind branch pipe to be used as material return wind, coal spreading wind and lubricating wind. Wind in the third recirculation branch pipe passes through an SNCR compressed gas branch pipe and an SNCR cooling wind branch pipe to be used as denitration spray gun compressed gas of an SNCR denitration system and cooling wind of the SNCR denitration system. The circulating fluidized bed boiler of flue gas recirculation comprehensive efficient utilization can better implement staged combustion, reduced in heat lossand improved in efficiency.

Description

technical field [0001] The invention belongs to the technical field of clean coal power generation, in particular to a circulating fluidized bed boiler and an operation method for comprehensive and efficient utilization of flue gas circulation. Background technique [0002] The biggest technical feature of the circulating fluidized bed boiler is that the fuel is repeatedly burned in a medium temperature environment in the furnace under the push of the material circulation system. Since the late 1960s, foreign countries have developed circulating fluidized bed boilers with industrial practical application value, and the research and application of foreign circulating fluidized bed boilers have entered a peak period. The installed capacity of circulating fluidized bed boilers in my country is the largest in the world. In recent years, with the development of my country's economy, the people's requirements for the quality of living environment have become higher and higher, an...

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