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建立了福建无烟煤细颗粒燃烧模型,计算了其在容量35 t/h循环流化床锅炉炉膛内的燃尽时间和一次通过炉膛的停留时间,分析了不同粒径煤颗粒在不同燃烧温度和不同烟气流速时在CFB锅炉内的燃尽时间和停留时间的变化差异.实验研究了福建无烟煤粒径对飞灰碳含量的影响及燃尽的影响.结果表明,细煤颗粒的燃尽时间与停留时间均随粒径增大而增长,但燃尽时间增幅更明显,颗粒一次通过炉膛完全燃尽的临界粒径约为0.15 mm;粒径越大的颗粒其停留时间和燃尽时间对烟气流速和燃烧温度变化越敏感;无烟煤入炉粒径明显影响CFB锅炉飞灰含碳量,选用粒度为3~8 mm的偏粗颗粒为宜.
The fume anthracite fine particle combustion model was established, the burnt time in the furnace of 35 t / h circulating fluidized bed boiler and the residence time in one pass through the furnace were calculated, and the effects of different particle sizes of coal particles at different combustion temperatures and different temperatures Flue gas flow rate in CFB boiler burnout time and residence time difference.The experimental study of Fujian anthracite coal particle size on the impact of carbon content and burnout.The results show that the burn time of fine coal particles and The residence time increases with the increase of particle size, but the increase of burnout time is more obvious. The critical particle size of particle once completely burned out in the hearth is about 0.15 mm. The larger the particle size is, the longer the residence time and the burnout time are. Gas flow rate and the more sensitive to changes in combustion temperature; Anthracite into the furnace particle size significantly affect the carbon content of fly ash CFB boiler, the selection of particle size of 3 ~ 8 mm of coarse particles is appropriate.