Soot blowing system for horizontal flue of boiler

Abstract

The invention discloses a soot blowing system for a horizontal flue of a boiler, wherein the soot blowing system performs coupling optimization of air leakage recovery of an existing rotary air preheater and soot blowing of the horizontal flue. The soot blowing system comprises a soot blowing nozzle and a soot blowing air duct connected to the inlet of the soot blowing nozzle, wherein the outlet of the soot blowing nozzle is arranged in the horizontal flue; the boiler is equipped with rotary air preheaters; the sealing gaps of the rotary air preheaters are provided with negative pressure air chambers which are connected to the inlets of booster fans through air leakage collecting air ducts; the outlets of the booster fans are connected to the soot blowing air duct; the air leakage collecting air ducts are provided with adjustment blocking plates which are used for adjusting the air volume of corresponding pipelines; and the soot blowing nozzle adopts a continuous blowing-swinging operation mode. The soot blowing system for the horizontal flue of the boiler has good economy. The reliability of the soot blowing nozzle is high. The effect of energy conservation and consumption reduction is significant.

Description

technical field [0001] The invention relates to the soot blowing treatment of the horizontal flue of a boiler, in particular to a system for completing the soot blowing treatment by utilizing the air leakage of a rotary air preheater. Background technique [0002] Large and medium-sized pulverized coal boilers generally adopt a π-shaped layout structure and are equipped with a rotary air preheater as standard. Basically, there are problems of dust accumulation in the horizontal flue of the boiler and air leakage from the rotary air preheater. [0003] In the horizontal flue area, because it is close to the refraction angle, the high-temperature flue gas flows through the refraction angle and turns sharply to form a recirculation zone, and the fly ash in the flue gas is separated and deposited at the bottom of the horizontal flue to form ash accumulation. The existing technology generally installs a certain number of soot-blowing hoods at the bottom of the horizontal flue, pa...

AI Technical Summary

Problems solved by technology

Although the air leakage recovery technology can control the air leakage of the preheater to a very low level (the air leakage rate can be reduced to 2-3%), the air leakage transferred to the hot secondary air will lower the temperature of the hot secondary air on the one hand, and on the other hand due to the new The increase of fans also increases the power consumption rate of the factory, so the economics of this technology is controversial, and further optimization and improvement are needed

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