As a new and mature clean coal technology with high efficiency and low pollution, CFB combustion technology has many advantages that other combustion methods do not have. Circulating fluidized bed belongs to low-temperature combustion, so the emission of helium oxide is far lower than that of coal-fired boiler, only about 100mg / Nm3, and it can realize direct desulfurization in the combustion process, with high desulfurization efficiency. Moreover, the technical equipment is simple and economic, and the initial investment and operation cost of desulfurization is far lower than that of dry pulverized coal boiler plus flue gas desulfurization (PC + FCD). The discharged ash has good activity, easy to realize comprehensive utilization and no secondary ash pollution. The range of load regulation is large, and the low load can be reduced to about 30% of the full load.