Three-step denitration technology for front-end smoke of bagasse boiler in sugarhouse

A three-step method and flue gas technology, which is applied in the direction of solid fuel combustion, combustion equipment, lighting and heating equipment, can solve the problems of increasing production costs, large investment costs, and high operating costs of sugar factories, so as to alleviate energy shortages, The effect of improving utilization efficiency

Inactive Publication Date: 2015-06-10
GUANGXI TIANRUN ENVIRONMENTAL PROTECTION ENG
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Problems solved by technology

This technology is realized by improving the combustion method and process, such as low-nitrogen burner, air staged combustion, fuel staged combustion, flue gas recirculation, etc. It is characterized by low investment and simple process, but the denitrification efficiency is low, and it is also Unable to meet the requirements of emission standards
Terminal denitrification ref...

Method used

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  • Three-step denitration technology for front-end smoke of bagasse boiler in sugarhouse
  • Three-step denitration technology for front-end smoke of bagasse boiler in sugarhouse

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Embodiment Construction

[0029] Below in conjunction with accompanying drawing, the present invention will be further described:

[0030] like figure 1 Shown is a schematic structural diagram of a three-step denitrification system for bagasse boiler flue gas in a sugar factory, a three-step denitrification process for flue gas at the front end of a bagasse boiler in a sugar factory, including the following detailed steps:

[0031] (1) Flue gas recirculation combustion: The present invention further improves the boiler air distribution system, the chimney flue gas is discharged from the boiler chimney 14, and 10%~25% of the dust collector is blown into the bottom of the furnace through the flue gas recycling fan 6 Fan flue gas, the flue gas distribution fan 7 sends this part of the reused flue gas back to the main combustion zone 8 of the boiler furnace as part of the primary air 17 at the bottom of the boiler and the boiler feed air 18, so that the excess air coefficient in the main combustion zone 8...

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Abstract

The invention provides a three-step denitration technology for front-end smoke of a bagasse boiler in a sugarhouse. The three-step denitration technology is characterized by comprising the following steps: (1) recycling combustion of the smoke: flue smoke between a draught fan of a dust collector at a bulged part at the bottom of a hearth and a chimney is used as boiler feeding air and part of bottom primary air and is conveyed back to a main combustion region of the hearth of the boiler; (2) biomass low-NOx mixing combustion is adopted to consume residual oxygen in the boiler smoke to promote NOx reduction; (3) external SNCR denitration: NOx is further reduced by a reducing agent. According to the three-step denitration technology, discharge with standards of the NOx in the smoke from the bagasse boiler in the sugarhouse is realized, and the denitration efficiency can be over 70 percent.

Description

technical field [0001] The patent of the invention relates to a flue gas denitrification process of a combustion boiler, especially a three-step denitrification process of the flue gas at the front end of a bagasse boiler in a sugar factory. Background technique [0002] Nitrogen oxides (NOx) are one of the main pollutants that cause serious air pollution. With the implementation of the new standard "Emission Standards of Air Pollutants for Thermal Power Plants" (GB13223-2011), stricter emission limits are set for the emission concentration of NOx indicators. [0003] Sugar factory boilers mostly use bagasse and eucalyptus bark as fuel, and use scraper-feeder-secondary hot air blowing to enter the furnace for suspension combustion. Suspension combustion needs to deliver a large amount of air to the boiler to make the fuel It can be fully burned in an oxygen-enriched atmosphere, and in a high-temperature environment, it causes excessive emissions of nitrogen oxides in the fl...

Claims

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Application Information

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IPC IPC(8): F23B80/02F23B90/06F23J7/00
Inventor 韦锦然黄进英李春荣
Owner GUANGXI TIANRUN ENVIRONMENTAL PROTECTION ENG
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