A novel thermogravimetric analyzer system of furnace with multiple temperature controller was described,which mainly decreased the analysis cycle duration down to 20 min.Furthermore,the present C591 rapid analyzer sys...A novel thermogravimetric analyzer system of furnace with multiple temperature controller was described,which mainly decreased the analysis cycle duration down to 20 min.Furthermore,the present C591 rapid analyzer system under software can monitor and control some coal physical and chemical properties like change of coal,control com- bustion regulation,operation of coal mixture,and improvement of the turnover rate of the transportation facilities as well.展开更多
In continuous biomass torrefaction plants,the products'yields,composition and homogeneity highly depend on the residence time of particles.A characterization of particle residence time distribution(RTD)was therefo...In continuous biomass torrefaction plants,the products'yields,composition and homogeneity highly depend on the residence time of particles.A characterization of particle residence time distribution(RTD)was therefore carried out in an industrial-scale multiple hearth furnace on poplar wood chips using radio frequency identification tracers.The effects of operating conditions,namely,mass flow rate of biomass,shaft speed of the rabbling system and interdental length on the RTD were studied.The increase of shaft speed and mass flow rate reduces particles’mean residence time.Lowering the length between two successive teeth also increases the bed speed.Uncontrollable biomass accumulation(also called“bulldozing”)was observed during several tests.This phenomenon is favored by a high mass flow rate of resources,a small interdental length between the teeth and a low shaft speed.RTD measurements were compared to the axial dispersion model.For all tests,the Peclet number is ranging between 20 and 62,indicating that the multiple hearth furnace cannot be modelled as an ideal plug flow reactor.展开更多
文摘A novel thermogravimetric analyzer system of furnace with multiple temperature controller was described,which mainly decreased the analysis cycle duration down to 20 min.Furthermore,the present C591 rapid analyzer system under software can monitor and control some coal physical and chemical properties like change of coal,control com- bustion regulation,operation of coal mixture,and improvement of the turnover rate of the transportation facilities as well.
文摘In continuous biomass torrefaction plants,the products'yields,composition and homogeneity highly depend on the residence time of particles.A characterization of particle residence time distribution(RTD)was therefore carried out in an industrial-scale multiple hearth furnace on poplar wood chips using radio frequency identification tracers.The effects of operating conditions,namely,mass flow rate of biomass,shaft speed of the rabbling system and interdental length on the RTD were studied.The increase of shaft speed and mass flow rate reduces particles’mean residence time.Lowering the length between two successive teeth also increases the bed speed.Uncontrollable biomass accumulation(also called“bulldozing”)was observed during several tests.This phenomenon is favored by a high mass flow rate of resources,a small interdental length between the teeth and a low shaft speed.RTD measurements were compared to the axial dispersion model.For all tests,the Peclet number is ranging between 20 and 62,indicating that the multiple hearth furnace cannot be modelled as an ideal plug flow reactor.
