Low-nitrogen combustion pulverized coal furnace and low-nitrogen combustion method

Abstract

The invention relates to a low-nitrogen combustion pulverized coal furnace and a low-nitrogen combustion method, and belongs to the technical field of power generation equipment. Coarse pulverized coal in a coarse coal bunker is treated by a primary cyclone separator, the coarse pulverized coal with large particles return to the coarse coal bunker, the coarse pulverized coal with small particles enter a secondary cyclone separator, and the coarse pulverized coal with a qualified particle size directly drops into a powder bin; the coarse pulverized coal with tiny particles comes out from an upper outlet of the secondary cyclone separator along with the wind, and then enters a dust removal device; the pulverized coal filtered by the dust removal device enters the powder bin, and outlet gasesenter a hearth through a secondary air inlet. The low-nitrogen combustion pulverized coal furnace and the low-nitrogen combustion method have the advantages that the utilization rate of the pulverized coal can be increased, the content of NOX can be reduced, and the controllability of composition and consumption of supplied materials can be realized.

Description

technical field [0001] The invention relates to a low-nitrogen combustion pulverized coal furnace and a low-nitrogen combustion method, belonging to the technical field of power generation equipment. Background technique [0002] Boiler low-nitrogen combustion technology can effectively reduce the formation of nitrogen oxides (NOx) in boilers, and the investment and operating costs are relatively low. It can significantly save the operation and maintenance costs of selective catalytic reduction (selective catalytic reduction, SCR) systems, and has been widely valued. and a large number of applications. At present, the low-nitrogen combustion transformation of boilers burning bituminous coal and lignite has achieved good results. However, for boilers burning low volatile coal, such as anthracite and lean coal boilers, there are still problems such as high NOx emission mass concentration (hereinafter referred to as "NOx emission concentration"), low boiler efficiency, and poo...

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Problems solved by technology

[0004] However, under normal circumstances, the composition and amount of primary air and secondary air are controllable, while the uncontrollability of tertiary air is strong (for example, the performance of coarse coal powder in different batches is different, and the pulverized coal entering the tertiary air The proportion may be different), which may lead to: (1) the temperature is too high (over 850°C), and the amount of NOx increases; (2) the amount of NOx generated after the tertiary air enters cannot be determined, so the amount of reducing agent that should be added cannot be determined; (3) The tertiary air inlet is generally too close to the top of the furnace, and the space in the reduction zone is limited, so NOx cannot be effectively reduced

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