Furnace Numerical Model Development for Checking the Possibility of Boiler Retrofitting from Liquid to Dry Ash Removal

摘要

Two schemes of lean Kuznetsky coal combustion with solid slag removal are proposed and investigated in the work: for the scheme with direct pulverized coal injection and for the scheme with pulverized coal bunker. Both schemes are based on the use of direct-flow burners and nozzles with a counter-displaced arrangement, the orientation of burners with a downward angle, and the use of staged fuel combustion. The possibility of a stable and efficient operation of the proposed schemes was tested in the ANSYS Fluent software package. The simulation results showed steady fuel combustion, carbon-in-ash losses of not more than 2% and a concentration of nitrogen oxides in flue gases of not more than 350 mg/m~3.