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数理分析结果表明,燃用无烟煤的循环流化床锅炉效率难以较大幅度提高,其根本原因在于:无烟煤燃料的一次烧失率较低,虽然燃料粒子经过有限的几次循环便可基本燃尽,但对于国内常用的低循环倍率锅炉,占有相当比例的、只经过极少次循环的燃料粒子,却含有较多的可燃物,它们随灰分一起由烟道排出。为减小这一部分损失,采用飞灰回燃技术是个行之有效的途径,可望获得锅炉效率的较大幅度提高,但相应带来锅炉尾部烟道灰浓度增大、受热面磨损加剧等不利影响。
The results of mathematical analysis show that the efficiency of circulating fluidized bed boiler burning anthracite is hard to be improved greatly. The fundamental reason is that the primary burning rate of anthracite fuel is low, although the fuel particles can be burnt out after a limited number of cycles , But for the domestic low-cycle rate boiler, possession of a considerable proportion of only very few cycles of fuel particles, but contains more combustibles, which together with the ash discharged from the flue. To reduce this part of the loss, the use of fly ash back to combustion technology is an effective way, is expected to get a more substantial increase in boiler efficiency, but the corresponding bring the boiler tail flue ash concentration increased heating surface wear and other adverse influences.