Coal-fired boiler high-temperature ammonia spraying denitration system based on biomass pyrolysis and method thereof

A technology for biomass pyrolysis and coal-fired boilers, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles. reasonable effect

Pending Publication Date: 2021-07-09
XIAN THERMAL POWER RES INST CO LTD
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Problems solved by technology

[0006] Aiming at the problem of low efficiency of high-temperature ammonia injection denitrification technology in the main combustion area in the prior art, the present invention provides a high-temperature ammonia injection denitrification system and method for coal-fired boilers based on biomass pyrolysis

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  • Coal-fired boiler high-temperature ammonia spraying denitration system based on biomass pyrolysis and method thereof

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0028] A high-temperature ammonia injection denitrification system for coal-fired boilers based on biomass pyrolysis, such as figure 1 As shown, it includes a boiler 8, a biomass pyrolysis device 16 and an amino reducing agent injection device 17; the side wall of the boiler 8 has a low-nitrogen burner 9, a biomass pyrolysis gas nozzle 10, and an amino reducing agent spray gun 11 in sequence along the height direction and SOFA air nozzle 12; the bottom of the boiler 8 is the main combustion zone, and the middle part is the burnout zone; the low-nitrogen burner 9, the biomass pyrolysis gas nozzle 10 and the amino reducing agent spray gun 11 are in the main combustion zone, and the SOFA air nozzle 12 is set in the burnout zone.

[0029] There is a panel superheater 14 and a high-temperature su...

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Abstract

The invention relates to a coal-fired boiler high-temperature ammonia spraying denitration system based on biomass pyrolysis and a method thereof, a biomass pyrolysis device and an amino reducing agent spraying device are connected to a boiler main combustion area, and high-temperature flue gas obtained after a high-temperature superheater is extracted is connected with the high-temperature flue gas inlet end of the biomass pyrolysis device; biomass fuel is subjected to multi-stage heating pyrolysis to generate mixed gas, and the mixed gas and an amino reducing agent are sequentially introduced into a main combustion area of the boiler; an air staged combustion mode is adopted, and the excess air coefficient of a main combustion area is reduced by utilizing a low-nitrogen combustor and an SOFA air nozzle; an SOFA nozzle is additionally arranged, so that a main combustion area is in a reducing atmosphere; an amino reducing agent is sprayed into the main combustion area, the amino reducing agent can be subjected to a reduction reaction with nitric oxide in flue gas in a high-temperature reducing atmosphere, and the concentration of the nitric oxide at a hearth outlet is reduced.

Description

technical field [0001] The invention relates to flue gas denitrification technology in thermal power plants, in particular to a high-temperature ammonia injection denitrification system and method for coal-fired boilers based on biomass pyrolysis. Background technique [0002] Nitrogen oxides are one of the main sources of air pollution in coal-fired power plants. At present, the NOx emission reduction technologies commonly used in coal-fired power plants include low-NOx combustion technology, non-selective catalytic reduction technology (SNCR) and selective catalytic reduction technology (SCR). The combination or combination of different denitrification processes will be an important development direction of denitrification technology. Innovating the denitrification mechanism and developing multi-stage composite denitrification processes are becoming the development direction. [0003] Conventional SNCR technology is to reduce NO to N by spraying an amino reducing agent in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56B01D53/74B01D53/34
CPCB01D53/346B01D53/56B01D53/74B01D53/8631B01D2251/2062
Inventor 陆续吴庆龙张向宇向小凤付康丽张波徐宏杰
Owner XIAN THERMAL POWER RES INST CO LTD
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