Inside-mixing type reducing agent atomizing spray gun for SNCR (Selective Non-Catalytic Reduction) denitration process

Abstract

The invention discloses an inside-mixing type reducing agent atomizing spray gun for an SNCR (Selective Non-Catalytic Reduction) denitration process, belonging to the technical field of boiler denitration devices. The inside-mixing type reducing agent atomizing spray gun comprises a spray gun sleeve, an electric propulsion plant and a spray gun and is characterized in that the spray gun sleeve is installed on the external wall of a boiler and communicated with a boiler hearth; the spray gun sleeve is inclined downward and has an included angle of 5-15 degrees with the horizontal plane; and the electric propulsion plant is fixedly connected with the spray gun and fixedly connected with the spray gun sleeve. When the system is put into operation, a motor is rotated forward and drives a screw rod to rotate through a coupler, a screw nut is moved forward in the rotation action of the screw rod and drives the spray gun to move forward and enter the hearth to spray; and when the system is shut down, the motor is rotated reversely and the screw nut moves backward to drive the spray gun to exit the hearth. The inside-mixing type reducing agent atomizing spray gun disclosed by the invention has the advantages of good atomizing effect, high degree of automation, low rate of gas consumption and prevention of corrosion to a water-cooled wall and is applicable to boilers such as a medium-small coal-powder boiler and a circulating fluidized bed the like; and the atomizing medium can be compressed air or steam.

Description

technical field [0001] The invention relates to an internal mixing reducing agent atomizing spray gun used in the SNCR denitrification process, and belongs to the technical field of boiler denitrification devices. Background technique [0002] my country is the world's major coal producer and consumer, and also a country that uses coal as its primary energy source. According to statistics, in 2002, raw coal accounted for 70.7% of my country's primary energy, while coal used for power generation accounted for 49.1% of coal consumption. The flue gas produced by coal combustion contains soot, sulfur oxides (SOx), nitrogen oxides (NOx) and CO 2 These pollutants are discharged into the atmosphere, which has caused serious environmental problems and is an important issue to be solved urgently for the sustainable development of my country's economy. [0003] Nitrogen oxides emitted along with flue gas not only cause the greenhouse effect and form nitric acid rain, but also are on...

AI Technical Summary

Problems solved by technology

Due to the late start of my country's denitrification technology, there are few domestic independent research and development technologies, and most of the denitrification reducing agent spray guns are foreign patented technologies, which restrict their application and development

Moreover, the existing reducing agent spray gun has a single structure and poor atomization effect. When the spray gun is out of service, it cannot automatically exit, and a cooling medium is required to cool the spray gun; Falling onto the water wall, causing corrosion and leakage of the water wall

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