Method for blowing soot for waste heat boiler by using waste

Abstract

The invention provides a method for blowing soot for a waste heat boiler by using waste, relating to a soot blowing method of a heat exchange pipe of a waste heat boiler. The method comprises the following steps: blown gas of a gas producer enters a cyclone dust collector and gas flow at an exhaust port of the cyclone dust collector enters an exhaust gas waste heat boiler. The method is characterized in that the cyclone dust collector collects deposited pulverized coal after being separated, and when the height of accumulated pulverized coal is close to a lower orifice of a central exhaust pipe of the cyclone dust collector, the accumulated pulverized coal is driven by blown gas is discharged from the exhaust port of the cyclone dust collector and enters a burner of the exhaust gas waste heat boiler; and particles produced after the combustion of blown gas and carrying coarse pulverized coal enters the boiler through a smoke channel to perform soot blowing on a heat exchange pipe bundle. The method has the advantages that blown gas, waste residues, waste soot and the like can be used as additives of coarse particulate pulverized coal soot, low-grade heat value in the waste residues and waste soot can be recycled, the utilization rate can be improved and a very good soot blowing effect can also be reached; therefore the method is an economical, efficient, convenient and quick technology.

Description

Technical field: [0001] The invention relates to a soot blowing method for heat exchange tubes of waste heat boilers. Background technique: [0002] The production process of chemical plants often produces waste gas such as blowing gas from gas generators, ammonia synthesis purge gas, and methanol purge gas. The prior art is to introduce these waste gases into waste gas waste heat boilers for combustion, which can make full use of energy. The exhaust gas waste heat boiler is composed of a combustion furnace and a boiler body. There is a flue gas channel between the two, through which the flue gas enters the boiler body and the heat exchange tube bundle in the boiler body to achieve indirect heat exchange. After the blowing air from the gasifier is introduced into the cyclone dust collector, the pulverized coal settles, and the air flow is introduced into the exhaust gas boiler through the exhaust port, and the ash discharge port of the cyclone dust collector is opened regul...

AI Technical Summary

Problems solved by technology

However, in terms of operation and performance of the soot blower device, there are disadvantages such as limited soot blowing range, dead angle of soot blowing, high energy consumption, high maintenance cost, inconvenient operation, side effects, etc., and the utilization rate is very low.

[0004] In addition, the slag of gas generators and circulating fluidized bed boilers in chemical plants has not been fully utilized

Images