In China, over 70 percent of the power production feeds on thermal power plants running with pulverized coal (PC) fired boilers. Millions of tons of oil is consumed annually to ignite PC when the boiler starts up, as well as to stabilize the combustion. In this paper, one oil-free ignition technique is studied for oil-saving, in which high temperature air is used to ignite PC. As a key parameter, the effects of PC concentration on the ignition of PC are investigated by means of particular numerical simulations of FLUENT5.3. Under the given conditions of coal analysis, the author simulates the effects of different PC concentrations on ignition process, including ignition distance, temperature of flame and gas components. Part of the simulation results has the same tendency as the experimental data. The research provides guidance for structure improvement and operation optimization of the oil-free ignition burner by high temperature air.

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