Judgment Method for Air Leakage in Boiler Bottom of Supercritical DC Direct-flow Front and Back Walls

Abstract

The invention provides a judgment method for air leakage of a boiler bottom of a supercritical direct current front and back wall opposed firing and relates to the technical field of power plants. The method includes the steps that running data of the boiler bottom of the supercritical direct current front and back wall opposed firing are acquired; a preset parameter threshold is acquired; and according to the running data and the parameter threshold, the air leakage condition of the boiler bottom of the supercritical direct current front and back wall opposed firing is judged. The judgment method achieves judgment on air leakage of the boiler bottom of the supercritical direct current front and back wall opposed firing, and can judge the air leakage amount, a certain basis is provided for better running of the boiler, and important theoretical meaning and engineering value is achieved.

Description

technical field [0001] The present invention relates to the technical field of power plants, in particular to boiler equipment in thermal power plants, and specifically relates to a method for determining air leakage from the furnace bottom of a supercritical direct-flow direct current wall against the bottom of a boiler. Background technique [0002] At present, during the operation of the unit, the impact of air leakage on the economy and safety of the unit cannot be underestimated. Air leakage includes furnace air leakage, air preheater air leakage, flue air leakage and furnace bottom air leakage, among which the furnace bottom air leakage has the greatest impact. The cold air at the bottom of the furnace is under the action of the negative pressure of the boiler, and the cold air enters the furnace from the bottom of the furnace. For the dry slag removal system, air leakage is inevitable, and the amount of air leakage is small, which will not cause too much threat to th...

AI Technical Summary

Problems solved by technology

However, most dry slag machines are mechanically sealed and have many observation holes. These designs may cause a large amount of cold air to leak in from the bottom of the furnace.

For the wet slag removal system, when the water seal is damaged, the cold air enters the furnace for a short time, which often causes the deviation of the smoke temperature to increase, the negative pressure in the furnace fluctuates, the fuel combustion is unstable, and even the protection action

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