Flue gas recycling combustion system

Abstract

The invention discloses a flue gas recycling combustion system, and relates to a semi-coke return and auxiliary flue gas recycling combustion technology in collaboration with a furnace partitioning device for generating low nitrogen oxide in a chain boiler. The problem that in an existing chain boiler low nitrogen combustion technology, the NOx emission and the stable operation of the boiler cannot be controlled simultaneously through the fuel graded combustion technology and the flue gas recycling technology is solved. The flue gas recycling combustion system comprises a chain boiler, a dustremover, a flue gas pipeline, and an induced fan, the coal powder is burned in the chain boiler, dust removing of the dust remover is conducted on the exhausted flue gas with the dust, then the flue gas after dust removing is exhausted into the air through the induced air, and the dust remover communicates with the induced fan through the flue gas pipeline; and the flue gas recycling combustion system further comprises a first flue gas recycling branch arranged on the chain boiler externally, and the first flue gas recycling branch sends the partial flue gas in the fuel gas pipeline back to the wind chambers corresponding to the combustion area and the partial main combustion area on a grating of the chain boiler. The flue gas recycling combustion system mainly carries out the low-nitrogencombustion.

Description

technical field [0001] The invention relates to a furnace partition device for a chain boiler with low nitrogen oxide generation in cooperation with semi-coke return and auxiliary flue gas recirculation burnout mode. Background technique [0002] In my country's coal-fired industrial boilers, chain boilers account for more than 60% of the total number of industrial boilers. Due to the stable combustion conditions of the chain boiler, good load adaptability, and continuously improving energy efficiency indicators, it has been promoted to continue to develop into a large-scale, and has become an important part of the heat source of urban central heating. [0003] In recent years, my country's environmental protection requirements have been increasing year by year, making the NOx emission problem of industrial boilers more and more prominent. In particular, the secondary source contribution rate of NOx to PM 2.5 in the urban air environment has attracted attention. On Decembe...

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Problems solved by technology

[0008] The present invention aims to solve the problem that in the existing chain boiler low-nitrogen combustion technology, the fuel staged combustion technology and the flue gas recirculation technology cannot control NOx emissions and the stable operation of the boiler at the same time. The present invention provides a flue gas recirculation combustion system and burning method

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