A novel micro kinetic analyzer(MFBK) for fluidized bed gas-solid reactions is developed.With this MFBK analyzer,the reaction rate and kinetic parameters can be deduced via measuring the time-dependent composition chan...A novel micro kinetic analyzer(MFBK) for fluidized bed gas-solid reactions is developed.With this MFBK analyzer,the reaction rate and kinetic parameters can be deduced via measuring the time-dependent composition changes of its evolved gas.By using a micro fluidized bed reactor,it is expected to enable the on-line feed of particle reactant based on a pulse solid conveying mechanics and the effective suppression of external gas diffusion in the reactor.This MFBK analyzer is evaluated through the decomposition of CaCO3 powder,giving an apparent activation energy of 142.73 kJ·mol-1 and a preexponential factor of 399777 s-1.This activation energy value is much lower then the TG-measured one of 184.3 kJ·mol-1 and within the literature-reported range of 120—280 kJ·mol-1.The measurement also provides a kinetic-model function with a correlation linearity of above 0.99.With this MFBK analyzer,the pyrolysis of coal and biomass at 800℃ is studied.The measured pyrolysis reaction finished in about 15 s,which is very close to the theoretically anticipation.This pyrolysis measurement with the MFBK analyzer can also identify a definite gas release order for typical gas species contained in the pyrolysis-formed gas products,which actually can provide a strong evidence for the deep insight in the pyrolysis reaction mechanism.展开更多
文摘A novel micro kinetic analyzer(MFBK) for fluidized bed gas-solid reactions is developed.With this MFBK analyzer,the reaction rate and kinetic parameters can be deduced via measuring the time-dependent composition changes of its evolved gas.By using a micro fluidized bed reactor,it is expected to enable the on-line feed of particle reactant based on a pulse solid conveying mechanics and the effective suppression of external gas diffusion in the reactor.This MFBK analyzer is evaluated through the decomposition of CaCO3 powder,giving an apparent activation energy of 142.73 kJ·mol-1 and a preexponential factor of 399777 s-1.This activation energy value is much lower then the TG-measured one of 184.3 kJ·mol-1 and within the literature-reported range of 120—280 kJ·mol-1.The measurement also provides a kinetic-model function with a correlation linearity of above 0.99.With this MFBK analyzer,the pyrolysis of coal and biomass at 800℃ is studied.The measured pyrolysis reaction finished in about 15 s,which is very close to the theoretically anticipation.This pyrolysis measurement with the MFBK analyzer can also identify a definite gas release order for typical gas species contained in the pyrolysis-formed gas products,which actually can provide a strong evidence for the deep insight in the pyrolysis reaction mechanism.
