The special design for the furnace and burner of boilers burning lignite is analyzed and the type selection of the pulverizing system is discussed by taking account of the lignite’s characteristics of high moisture, ...The special design for the furnace and burner of boilers burning lignite is analyzed and the type selection of the pulverizing system is discussed by taking account of the lignite’s characteristics of high moisture, low heating value and low ash fusion temperature. The impact of such characteristics on the type selection of burning equipment and pulverizing systems for the lignite boiler is studied. The value ranges of the furnace characteristic parameters for the lignite boiler are recommended. For the old lignite, the premix period in the burner should not be too long in order to avoid slagging and the velocity of the primary air is suggested to be between 17 m/s and 22 m/s. The direct-flow burner with tangential firing is preferred for lignite with the moisture higher than 35%. The medium-speed mill is better to be used for lignite with the moisture less than 35%, while for lignite with the moisture higher than 40% the fan mill should be the first choice.展开更多
The type selection of burning equipment for boilers is affected significantly by the slagging characteristics of coal. Based on the engineering statistics method, the designed furnace parameters are obtained from the ...The type selection of burning equipment for boilers is affected significantly by the slagging characteristics of coal. Based on the engineering statistics method, the designed furnace parameters are obtained from the 600-MW and 1 000-MW boilers with tangential firing and wall firing. The power and arrangement of the burners are analyzed. Their impacts on slagging on heating surfaces and the carbon contents in the ash and cinders are also discussed. Thermal parameters of furnace are recommended for boilers of 600 MW and 1 000 MW firing slagging coal in the design. The static or rotary classifier should be the first choice for the pulverizing system.展开更多
When designing and selecting burning equipment for low volatile coal fired boilers,the primary concerns are about coal ignition and burnout.The characteristics of ignition and burnout are analyzed for low volatile coa...When designing and selecting burning equipment for low volatile coal fired boilers,the primary concerns are about coal ignition and burnout.The characteristics of ignition and burnout are analyzed for low volatile coal and the technical measures are discussed for enhancing the combustion and burnout.The adaptability of tangential firing,wall firing and double-arch firing for low volatile coal is studied.Based on the statistic analysis for the main design parameters of domestic low volatile coal fired boilers with tangential firing,wall firing or double-arch W flame firing,the thermal performance for various boiler furnaces is recommended.The combustion systems for different types of boilers are also put forward for coals with different volatiles.展开更多
文摘The special design for the furnace and burner of boilers burning lignite is analyzed and the type selection of the pulverizing system is discussed by taking account of the lignite’s characteristics of high moisture, low heating value and low ash fusion temperature. The impact of such characteristics on the type selection of burning equipment and pulverizing systems for the lignite boiler is studied. The value ranges of the furnace characteristic parameters for the lignite boiler are recommended. For the old lignite, the premix period in the burner should not be too long in order to avoid slagging and the velocity of the primary air is suggested to be between 17 m/s and 22 m/s. The direct-flow burner with tangential firing is preferred for lignite with the moisture higher than 35%. The medium-speed mill is better to be used for lignite with the moisture less than 35%, while for lignite with the moisture higher than 40% the fan mill should be the first choice.
文摘The type selection of burning equipment for boilers is affected significantly by the slagging characteristics of coal. Based on the engineering statistics method, the designed furnace parameters are obtained from the 600-MW and 1 000-MW boilers with tangential firing and wall firing. The power and arrangement of the burners are analyzed. Their impacts on slagging on heating surfaces and the carbon contents in the ash and cinders are also discussed. Thermal parameters of furnace are recommended for boilers of 600 MW and 1 000 MW firing slagging coal in the design. The static or rotary classifier should be the first choice for the pulverizing system.
文摘When designing and selecting burning equipment for low volatile coal fired boilers,the primary concerns are about coal ignition and burnout.The characteristics of ignition and burnout are analyzed for low volatile coal and the technical measures are discussed for enhancing the combustion and burnout.The adaptability of tangential firing,wall firing and double-arch firing for low volatile coal is studied.Based on the statistic analysis for the main design parameters of domestic low volatile coal fired boilers with tangential firing,wall firing or double-arch W flame firing,the thermal performance for various boiler furnaces is recommended.The combustion systems for different types of boilers are also put forward for coals with different volatiles.
