On-line soot blowing method and on-line soot blowing device for coal water slurry boiler

Abstract

The invention discloses an on-line soot blowing method and an on-line soot blowing device for a coal water slurry boiler. The bottom of a convection heating surface of the coal water slurry boiler is provided with a soot blowing device along the smoke circulating direction, the soot blowing device is provided with over two nozzles with oblique upward outlets along the smoke circulating direction, the soot blowing device can eject high-pressure steam or compressed air through the nozzles along the smoke circulating direction in turn, the high-pressure steam or the compressed air blows the inside of the heating surface of the boiler section by section in order and compels large granules deposited in a smoke passage of the heating surface of the boiler to elevate again due to the impact of strong airflow, and meanwhile the granules collide with the metal wall of the heating surface so that the dust adhered to the metal wall drops due to the action of an external force and is discharged along with the smoke together to achieve the soot blowing effect. The method and the device have the advantages of simple required equipment, low operating expense, high efficiency and low manpower intensity.

Description

technical field [0001] The invention relates to a boiler combustion method and a boiler structure, in particular to a method and a device for cleaning dust in a heating surface of a boiler when a coal-water slurry combustion boiler is burning. When the boiler burns, the dust cleaning method and device in the heating surface of the boiler can make the coal-water slurry burn continuously and stably for a long time in the boiler. Background technique [0002] Coal water slurry is a coal-based liquid fuel that is mixed with coal, water and additives. It has low ash and low sulfur, and is an environmentally friendly and clean fuel. The development of coal water slurry has always been a national key energy project, and the country has issued a number of related policies and documents. Therefore, coal water slurry and coal water slurry boilers have very broad prospects in our country. However, as a coal-based fuel, coal-water slurry contains a certain amount of ash. After combust...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is: Aiming at the problems that the existing coal-water slurry boiler is not easy to be cleaned when the boiler is in normal operation, the boiler needs to be shut down regularly for cleaning, and the labor intensity of the workers is high. On-line soot blowing method and device for coal-water slurry boilers that can effectively remove ash deposits inside the boiler during operation and do not need to shut down the boiler during cleaning

Images