In order to solve the problem of the low efficiency brought by the exhaust gas temperature up to 180~ 190 ℃ of a 75 t/h biomass circulating fluidized bed boiler in a biomass power plant in Zhejiang and the boiler flameout brought by the water content of the waste wood higher than 45%

this study presents that

the exhaust gas temperature is reduced to below 150 ℃ by using the boiler waste heat to heat air

water and other different media.And the waste wood moisture content is decreased to 5% by using the heated medium to dry wood waste indirectly to meet the water content requirements of fuel for the boiler.Meanwhile

the energy balance

mass balance and economic efficiency of heating waste wood by different media are calculated.The results show that the method of air preheater plus dryer is considered to be the best drying method of dry waste wood by the waste heat from flue gas of circulating fluidized bed boiler.