Biomass gas coupled coal-fired unit power generation device

Abstract

The invention provides a biomass gas coupled coal-fired unit power generation device, which mainly solves the problems that under an ultralow load situation, SCR inlet temperature is lower than effective working temperature of a catalyst, which causes that denitration cannot be put in use. A circulating fluidized bed gasifier, a cyclone dust collector, a fuel gas heat exchanger are successively connected via pipelines. The outlet of the fuel gas heat exchanger is divided into two paths: one passes through a fuel gas combustor A via a path-A fuel gas pipeline and is connected to the hearth of aboiler furnace, the other passes through a fuel gas combustor B via a path-B fuel gas pipeline and is connected to a horizontal flue in the front of a SCR denitration device. The SCR denitration device is connected to the outlet of a coal-firing boiler economizer through the horizontal flue. The fuel gas combustion chamber of the fuel gas combustor B is connected to a tail secondary air duct of the coal-firing boiler. The tail secondary air duct of the coal-firing boiler and the outlet flue of the SCR denitration device are respectively to a revolving air preheater. The device achieves coupled power generation of the biomass flue gas and the coal-fired unit under an ultralow load situation of the coal-fired unit.

Description

technical field [0001] The invention relates to the field of coal-fired boiler systems for power generation, in particular to a biomass gasification coupled coal-fired unit power generation device. Background technique [0002] With the continuous development of biomass power generation technology, "biomass gasification coupled coal-fired unit power generation technology" has become the mainstream technical route of biomass power generation due to its significant advantages of high biomass energy conversion rate and easy measurement. The biomass is converted into biomass gas after being gasified by the gasifier, and then the biomass gas is transported to the coal-fired boiler for combustion and power generation. [0003] On the one hand, due to the complexity of the biomass gasification system, when the coal-fired boiler needs variable load operation, the biomass gas cannot realize the flexible start and stop or fuel quantity adjustment similar to the coal mill, and when the...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the above-mentioned problems in the prior art, and further provide a biomass gasification coupled coal-fired unit power generation device, which solves the problem of low smoke temperature at the SCR inlet under ultra-low load conditions, which is lower than the effective working temperature of the catalyst , the problem that denitrification cannot be put into use; at the same time, it better realizes the coupled power generation of biomass gas and coal-fired units under the ultra-low load operation condition of coal-fired units, and avoids the impact of biomass gas mixed in the combustion zone under ultra-low load. Combustion of Coal Boiler and Influence of Performance Parameters

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