Low-nitrogen combustion stokerfeed boiler with two-stage smoke recirculation function

A technology of flue gas recirculation and low-nitrogen combustion, which is applied in chain furnaces and low-nitrogen combustion chain furnaces. It can solve the problems of low efficiency and high emission of chain furnaces, reduce NOx generation, delay combustion process, and reduce NOx emissions. Effect

Active Publication Date: 2015-07-22
江苏宇澄环境工程设备有限公司
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Problems solved by technology

[0004] The purpose of the present invention is in order to solve the chain furnace NO that background technology mentions x High emissions and existing combustion t...

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  • Low-nitrogen combustion stokerfeed boiler with two-stage smoke recirculation function

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with accompanying drawing.

[0016] Such as figure 1As shown, the low-nitrogen combustion chain furnace with two-stage flue gas recirculation of the present invention is composed of a furnace 1, a coal feeder 2, a chain grate 3, a slag hopper 4 and a tail flue 5; The furnace 1 is divided into upper and lower parts by the front furnace arch 7a and the rear furnace arch 7b, and the upper part of the furnace 1 includes a front wall 1a, a rear wall 1b and a flame corner 1c; An economizer 10 and an air preheater 11 are arranged from top to bottom; a plurality of primary air chambers 6-1 are arranged in the space area wrapped by the chain grate 3, and the plurality of primary air chambers 6-1 are arranged along the The traveling direction of the chain grate 3 is arranged in the shape of "one", and the outlets of the plurality of primary air chambers 6-1 communicate with the chain grate 3 to supply the prima...

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Abstract

The invention discloses a low-nitrogen combustion stokerfeed boiler with a two-stage smoke recirculation function. Segmentation wind supply is adopted for a fire grate combustion region, and over-fire air is deployed above the secondary air in a suspended combustion region so as to organize staged combustion; smoke with the low temperature ranging from about 250 degrees to 300 degrees is extracted from a tail smoke channel and sent into a plurality of wind chambers in the front of a fire grate so as to organize the first-level smoke recirculation in the fire grate combustion region; reducibility smoke with volatile component N, namely smoke with the medium temperature ranging from about 450 DEG C to 500 DEG C is extracted from the lower region of a front arch and jet into a burnout region below a furnace arch of a hearth at a high speed to be used for organizing the second-level smoke recirculation in the hearth burnout region. With the help of two-layer staged combustion of the fire grate combustion region and the suspension combustion region and smoke recirculation in the fire grate combustion region, NOx generation is inhibited greatly; furthermore, with the help of the medium-temperature reducibility flue smoke of the second-level smoke recirculation, NO generated in the ascending smoke in the burnout region is reverted to N2, and finally efficient low-nitrogen combustion of the stokerfeed boiler is achieved.

Description

technical field [0001] The invention relates to a chain furnace, in particular to a low-nitrogen combustion chain furnace with two-stage flue gas recirculation, belonging to the technical field of industrial boiler combustion. Background technique [0002] Chain furnaces are widely used in coal-fired industrial boilers in my country. In terms of combustion organization, the chain furnace is dominated by constant-speed moving grate layer combustion, supplemented by suspended combustion formed by fine particles in the upper area of ​​the grate. The air distribution is dominated by the primary air sent from the bottom of the grate, and the secondary air from the upper part of the grate is supplemented. From the point of view of combustion concept, chain furnace can theoretically avoid NO X generated in large quantities. However, in actual operation, in order to ensure better burnout of the grate layer combustion and suspension combustion, strong wind needs to be sent into th...

Claims

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Application Information

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IPC IPC(8): F23B80/02F23J15/00F23L1/00F23L9/00
Inventor 凌忠钱况敏谭立武
Owner 江苏宇澄环境工程设备有限公司
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