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Multi-point injected ammonia water atomization reduction method for reducing NOx discharge of gas-fired boiler

A gas-fired boiler and ammonia water technology, which is applied in the field of gas-fired boiler NOx reduction, multi-point injection ammonia water atomization reduction to reduce nitrogen oxide emission, can solve the problems of short residence time, ammonia water escape, and ammonia water temperature being too targeted. The effect of reducing NOx generation and NOx emission

Inactive Publication Date: 2016-05-04
SHANGHAI WISEBOND TECH
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  • Summary
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Problems solved by technology

However, the above two methods also have their significant disadvantages, such as the temperature of the sprayed ammonia water is too targeted, the applicable temperature range is narrow, the residence time is short, the investment and operation costs are expensive, the boiler system is corroded after the ammonia water escapes, and there is a toxic catalyst for subsequent treatment, etc. question

Method used

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  • Multi-point injected ammonia water atomization reduction method for reducing NOx discharge of gas-fired boiler
  • Multi-point injected ammonia water atomization reduction method for reducing NOx discharge of gas-fired boiler

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Embodiment Construction

[0012] figure 1 It is a schematic structural diagram of the ammonia reduction system; figure 2 Schematic diagram of the structure of the multi-point injection system.

[0013] Such as figure 1 , shown in 2, a gas-fired boiler for reducing nitrogen oxide emissions by atomizing reduction of multi-point injection ammonia water, including compressed air system, ammonia water supply system and multi-point injection system, is characterized in that:

[0014] The compressed air system includes an air storage tank 3 , a flow control valve 4 , a pressure regulating valve 5 , an air solenoid valve 6 and a compressed air distribution chamber 7 connected successively by pipelines.

[0015] The ammonia water supply system is pipe-connected with the ammonia solution distribution chamber 2 by controlling the regulating valve 1;

[0016] The multi-point injection system includes a plurality of spray guns 8 symmetrically and evenly distributed around the inner water wall 10 of the furnace ...

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Abstract

The invention provides a multi-point injected ammonia water atomization reduction method for reducing NOx discharge of a gas-fired boiler, aims at solving the technical problem that gas fuel is directly burned for decrease and accordingly a large amount of NOx is generated and environmental pollution is caused and belongs to the technical field of reduction of nitrogen oxide discharge of the gas-fired boiler. The multi-point injected ammonia water atomization reduction method is characterized in that after ammonia water is subjected to compressed air atomization and is jet to a main burning area (fuel-rich area) with the temperature of above 1000 degrees of a gas-fired boiler area through spray gun spray nozzles symmetrically and evenly distributed in a layered multi-point mode, so that NH3 in atomized ammonia steam and hydroxyl and NOx of the main burning area produce chemical reduction reaction, and the NOx concentration is reduced. The low-temperature atomized ammonia water is jet to the high-temperature main burning area, and local burning temperature of the area can be reduced. In addition, the atomized ammonia water can dilute oxygen concentration, reduces binding probability of nitrogen, a nitrogen compound and oxygen and accordingly reduces NOx. The NOx concentration in exhaust gas is reduced.

Description

technical field [0001] The invention relates to a gas-fired boiler for reducing the emission of nitrogen oxides by a reduction method, in particular to a gas-fired boiler for a boiler plant with an ammonia gas supply source and a method for reducing the emission of nitrogen oxides by multi-point spraying ammonia water atomization reduction, which belongs to the gas boiler Boiler NOx emission reduction technical field. Background technique [0002] In the face of the intensified smog crisis, the "coal-to-gas" boiler project is an important measure to improve the smog, and the Ministry of Environmental Protection has put forward higher requirements in terms of emission concentration, and it is imminent to reduce the emission of nitrogen oxides in gas-fired boilers . The methods commonly used at home and abroad to reduce the emission concentration of nitrogen oxides from gas-fired boilers are: SNCR method (no catalyst is required, that is, non-selective catalytic reduction met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/79B01D53/56
CPCB01D53/79B01D53/56B01D2251/2062B01D2258/0283
Inventor 陈宝明毕德贵田莉勤刘佳云
Owner SHANGHAI WISEBOND TECH
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