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

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...

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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

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