A method and device for blowing soot on the convection heating surface of a boiler

Abstract

The invention provides a method and a device for blowing soot of a convection heating surface of a boiler. The method includes the steps: acquiring thermal parameters of the convection heating surface of the boiler running under a first working condition; and analyzing the acquired thermal parameters according to a database to obtain pollution parameter values of the convection heating surface of the boiler running under the first working condition. The database contains data information of the processed thermal parameters, a soot blowing system only blows the soot of the convection heating surface with the pollution parameter values meeting soot blowing conditions by judging whether the pollution parameter values of the convection heating surface meet pollution indexes or not, the thermal efficiency of the boiler is improved, and energy waste caused by unnecessary soot blowing is decreased.

Description

technical field [0001] The invention relates to the field of boiler soot blowing, in particular to a soot blowing method and device for a convection heating surface of a boiler. Background technique [0002] When pulverized coal is burned in the boiler furnace, in addition to the main combustion products such as carbon dioxide, sulfur dioxide and NOx, the inorganic minerals and metal organic substances in the coal will form residues, namely ash. When the flue gas temperature is higher than the softening temperature of the ash, the ash melts into a liquid state and sticks to the convective heating surface of the furnace to form slagging; at a higher flue gas temperature, the ash volatilizes into a gaseous state, and then in the cooler The water wall, superheater, reheater, economizer and other tube surfaces condense and combine with fly ash to deposit on the tubes to form fouling. More or less slagging and ash accumulation in the boiler is inevitable. Since the thermal condu...

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Problems solved by technology

[0004] However, in the actual operation of the boiler, due to the influence of factors such as coal quality changes and combustion adjustments, the actual ash deposition rate on the convection heating surface is often inconsistent with the original prediction, or even has a large deviation. According to the soot blowing rate set during the boiler design Periodic sootblowing is often unreasonable, resulting in insufficient or too frequent sootblowing

Due to the difference in the layout position of the convection heating surface and the difference in the structure of the pipe row, the speed of the ash in different convection heating areas is also different, resulting in the need for soot blowing on some convection heating surfaces, but because the set soot blowing period has not yet arrived, the soot blowing The device does not perform soot blowing action, which affects thermal efficiency

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