Research on Ash Deposition Characteristics of Water-cooled Wall of Zhundong Coal-fired Boiler
In order to optimize the combustion in the furnace and reduce the water-cooled wall slagging,the 660 MW ultra-supercritical Zhundong coal-fired tangentially fired boiler in a power plant was taken as the research object.On the basis of the gas-solid two-phase combustion model,the self-defined udf pro-gram was loaded coupling with the fly-ash particles deposition model.The numerical simulation research on the distribution of ash particles deposition on the boiler radiant heated surface was conducted.The re-sults show that under 75%THA condition,the ash particle deposition rate on the heating surface is the largest in the height interval of 26-29 m and 32-35 m in the furnace;the ash deposition distributions on the four walls of the furnace are similar,with the maximum rate of ash particle deposition in the middle position along the width and depth directions of the boiler,which decreases gradually to both sides;as the load increases from 75%THA to 100%THA,the wall ash particle deposition rate increases and the deposition range becomes larger.
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