Influence of the Particle Size of Fujian Anthracite Coal on Its Burnout in CFB Boiler
ZHUANG Huang-huang HE Hong-zhou LI Zhi-wei ZOU Zheng
Mechanical Engineering College of Jimei University Cleaning Combustion and Energy Utilization Research Center of Fujian Province, School of Mechanical Engineering, Jimei University Cleaning Combustion and Energy Utilization Research Center of Fujian Province, School of Mechanical Engineering, Jimei University Cleaning Combustion and Energy Utilization Research Center of Fujian Province, School of Mechanical Engineering, Jimei University
Abstract：A simplified heat transfer and combustion model for the combustion of fine anthracite coal particles in a circulating fluidized bed (CFB) boiler was established. The burnout time and residence time (one time through furnace) of a single fine coal particle in the CFB boiler were calculated, and the effects of particle sizes of Fujian anthracite on both of time at different combustion temperatures and flue gas velocities examined. Besides, industrial combustion experiments of Fujian anthracite were conducted in a 35 t/h CFB boiler to test the effect of coal particle size on the carbon content of fly ash. It is shown that the particle size has a significant effect on the burnout of coal in the boiler. With rising of the coal particle size, both the burnout time and residence time increase, but the former increases more faster than the latter, the critical particle size of Fujian anthracite in burnout, which is burnt out once through the furnace, is about 0.15 mm. As the particles are coarser, their residence time is more sensitive to the flue gas velocity, while their burnout time to the combustion temperature. For those CFB boilers with small capacity for combustion of Fujian anthracite, in order to reduce the carbon content in fly ash, using the coarse coal particles with the sizes of 3~8 mm is suitable.
庄煌煌 何宏舟 李志伟 邹峥. 粒径对福建无烟煤在CFB锅炉中燃尽的影响[J]. , 2013, 13(5): 846-850.
ZHUANG Huang-huang HE Hong-zhou LI Zhi-wei ZOU Zheng. Influence of the Particle Size of Fujian Anthracite Coal on Its Burnout in CFB Boiler. , 2013, 13(5): 846-850.
2013, Vol. 13 
