Soot blower suitable for SCR denitration of high-temperature and high-dust flue gas

Abstract

The invention provides a soot blower suitable for SCR denitration of high-temperature and high-dust flue gas. The soot blower comprises an air supply unit, a control air valve unit, a gas transmissionheader pipe, and a nozzle unit, wherein the air supply unit is hermetically connected with one end of the air transmission header pipe through the control air valve unit; a gas transmission branch pipe is arranged on one side of the gas transmission header pipe; the nozzle unit is fixedly connected to the gas transmission branch pipe; wherein the nozzle unit is of a flat structure; according to the invention, the flat nozzle is adopted; the injection area and the effective effect are larger than those of the traditional circular injection hole; the soot blower is simple in structure and uniform in blowing force in a coverage area, can effectively prevent excessive local stress and damage to the surface layer of the catalyst, is mounted on the side of a certain distance above the surface layer of the catalyst, can effectively solve the problem of a blowing dead zone of a traditional soot blower, and solves the problems of local soot accumulation and blockage.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a soot blower suitable for SCR denitrification of high-temperature and high-dust flue gas. Background technique [0002] As the emission standards of air pollutants in the cement industry become more stringent, the emission limits of nitrogen oxides in cement kiln and kiln tail flue gas are approaching the ultra-low emission limits of the thermal power industry. The nitrogen oxide treatment of cement kiln tail gas adopts SCR process technology, which can stably meet the most stringent emission requirements. SCR is to install a catalytic reactor at the outlet of the cement kiln preheater, spray a reducing agent (such as ammonia or urea) in front of the reactor, and under the appropriate temperature (300-400 ° C) and catalyst action, the flue gas Nitrogen oxides are reduced to nitrogen and water. This method does not require reheating and consumes a lot of energy...

AI Technical Summary

Problems solved by technology

The Chinese patent "A Pipe Network Type SCR Denitrification Catalyst Hot Air Soot Blowing System and Operation Method" (CN109513353A) discloses the combined application of high pressure steam soot blowing and compressed air as the power source of acoustic wave soot blowing, which is not suitable for cement Denitrification and Ash Cleaning of Kiln Tail Flue Gas

[0004] The Chinese patent "Sootblower for Glass Kiln, Cement Kiln, Coke Oven Flue Gas Denitrification SCR Device" (CN209378802U) discloses that compressed air is used as the power source, and the sootblower is installed on a 360-degree rotatable support. Ash plant, the rotating parts of which have the risk of unstable operation under high temperature, high dust and flue gas conditions

[0005] The Chinese patent "An Active Pulse Compressed Air Soot Blower" (CN105478009A) discloses a soot blowing form using compressed air as a power source, a rake pipe network and a number of blowing components, but when dealing with a large soot cleaning area, The instantaneous consumption of compressed air is astonishing, and the vertical injection has a great impact on the surface of the catalyst

Due to the very limited spray coverage of the circular nozzle hole and the limited angle, the coverage area is limited, and there is a dead angle for cleaning

[0007] The Chinese patent "A Soot Blower" (CN101846325B) discloses a soot blower that can solve the dead angle of the soot blowing area, but it still needs to rely on the motor to drive the parts to rotate, and there is a risk of unstable operation

[0008] The Chinese patent "Sootblower Nozzle Assembly with Improved Downstream Nozzle" (1375657A) discloses a spray group assembly that can reduce flow interference, but it is still a circular nozzle hole in essence, and there is a blowing dead zone in the coverage angle

Images