Experimental Study on Operation Characteristics of Circulating Fluidized Bed Boiler Burning Zhundong Coal Under Variable Conditions
The high alkali and alkaline earth metals in Zhundong coal causes serious slagging and fouling on the heating surface during combustion process,which affects the safe and stable operation of boiler.Circulating fluidized bed boiler has the advantages of wide fuel adaptability,low nitrogen oxide emission and wide range of load regulation.Moreover,the combustion of high alkali coal in CFB boiler is considered as an effective means to solve the slagging and fouling problem.In order to analyze the operation characteristics of CFB boiler under different loads,the test was carried out on the 325 t/h CFB boiler burning Zhundong coal.The results show that the bed temperature of the boiler is evenly distributed,and the boiler maintains a high efficiency during operation,which indicates the boiler has a good load adaptability.With the increase of load,the fluidization of bed material in dense zone is significantly improved.While the temperature difference between upper and lower of the furnace increases gradually with the decrease of load.In addition,when the boiler runs at low load,the flue gas temperature at the outlet of the furnace is low,so,attention should be paid to the problem of the steam temperature at low load.
Zhundong coalcirculating fluidized bed boilerload regulationoperation characteristics
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