Analyzing the inadaptability of uniform air distributing burner for bituminite with high slagging property

摘要

In traditional pulverized coal tangential firing boiler design, the uniform air distributing burner is always adopted to burn bituminite with fine ignitability, the good furnace flame coefficient of fullness and coal powder burn-off rate can be obtained. But such assemblage also gives the inadaptability for coal quality, furnace slagging while burning clinkering coal, the local high temperature zone and uniform air distribution also leads to high emission of thermal NO{sub}x and fuel NO{sub}x. Using uniform air distribution burner also results in bad flame stability at low load and the severe twisting residual at furnace exit. In this paper, a kind of combination burner system is developed by moving the upper primary air to lower location and using the horizontal fuel-rich and lean burner. The modeling test and numerical simulation are used to prove the scheme's feasibility, the hot test illustrates that the scheme is exact.