A hearth slagging thickness judgment method based on numerical simulation

Abstract

The invention provides a hearth slagging thickness judgment method based on numerical simulation. The hearth slagging thickness judgment method comprises the steps that A, inputting hearth data into amodel; B, performing grid division on the hearth; C, performing numerical simulation in FLUENT software, and setting a condition model and a simulation algorithm; D, collecting actual data in the hearth, and importing the actual data into a simulation algorithm to obtain a flame combustion temperature; E, through a first thermodynamic calculation formula, calculating and obtaining the wall temperature when the clean water cooling wall has the slag thickness of 0 mm; F, introducing the wall temperature of the clean water wall into a simulation algorithm to obtain reference data, and comparingthe reference data with actual data; Step G, substituting the reference data and the flame combustion temperature into a second thermodynamic calculation formula to obtain wall temperature when the contaminated water wall has the slagging thickness of n mm, and importing the wall temperature into a simulation algorithm to obtain wall temperature data when the slagging thicknesses are different; And step H, performing formula fitting on the wall temperature data at different slagging thicknesses to obtain a relational expression between the slagging thicknesses and the hearth outlet smoke temperature.

Description

technical field [0001] The invention relates to the field of simulation calculation, in particular to a method for judging the thickness of furnace slagging based on numerical simulation. Background technique [0002] In recent years, there have been many researches on furnace slagging and prediction in China. In actual boiler operation, operators need to keep abreast of the degree and development trend of slagging and ash in the furnace, and according to the status of ash and slagging and operation needs , Reasonably and effectively operate the sootblower. Due to the limitation of the actual environmental conditions of the boiler, it is impossible to directly judge the slagging situation in the furnace. At present, the soot blowing systems of domestic power plants basically work according to the pre-set soot blowing cycle, and it is difficult to respond to the real-time situation in time. Excessive use of soot blowers will cause wear and tear on the pipe wall, waste energ...

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Problems solved by technology

Due to the complexity of the process and the variability of fuel in coal-fired boilers, so far, there is a lack of mature theory and experience in the design and operation of boilers, and cold and hot tests are often required to determine operating and design parameters. This type of test cycle is long , cost a lot, and it is difficult to obtain comprehensive and satisfactory data

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