Combustion Stability of Swirling Burners
ZHAO Ling-ling, ZHOU Qiang-tai (Faculty of Power Engineering, Southeast University, Nanjing 210096, China)
Aiming at the combustion stability problem of low volatile coal in swirling burners, and introduction to stabilizing measure used in this country and abroad is presented, including divergent outlet, bluff cone, bias combustion, gear ring stabilizer etc. The primary air flow field of a swirling burner is further numerically simulated and analyzed in detail. Analyzing results show that in flow fields, with the above measures involved, the pulverized coal-air flow entering the furnace, besides to pulsating, first of alol moves along the recirculating zone's outer boundary, diverging outwards, but without mixing rapidly with the hot gast. Therefore, in case of low volatile coal, these measures are not contributory to stabilizing combustion. New research orientations for solving the combusting stability problem of swirling burners are proposed, and the knowledge concerning combustion broadened. Simulataneously, petal flame stabilizers are introduced which may incite new ideas for further development of stabilizing techniques of swirling combustion. Figs 8 and refs 9.
【CateGory Index】： TK223.23