Research On Pyrolysis Of Pine Sawdust Using Biomass Char As Catalyst

Energy is the material foundation of human activities. The development of humansociety cannot live without superior energy and the application of advanced energytechnology. We are now suffering several serious energy problems, such as rapideconomic growth in emerging countries, high energy consumption in developed countriesand short supply of one-time energy resource, so how to improve energy efficiency, howto improve the energy structure and how to seek diversification of energy sources havebecome the consensus of the world. Biomass is abundant, and it can play a dual role byalso reducing our reliance on fossil fuels and cutting greenhouse gas emissions, so it willbecome the focus of further study.The research on reactivity of biomass char with CO₂was studied in a lab-scale fixedbed, mainly investigating the influence of different temperatures and CO₂pressures, andthe Unreacted Shrinking Core Model（SCM） and the Hybrid Model（HM） were used tostudy of reaction kinetic processes. The results indicated that biomass reactive faster withhigher temperature and partial pressure of CO₂, and that the SCM reflected morerealistically than the HM both in different temperature and different CO₂pressure, butwhat we should notice was that the kinetic processes was changing to the HM when thetemperature was over850℃. Data obtained also showed the reaction rate constantincreased as the growing of temperature and CO₂pressure.The experiment of biomass catalytic pyrolysis based on pine sawdust was conductedin this study, using biomass char as a catalyst and the main influence factors consideredwere temperature, addition amount of biomass char, particle size of biomass char andbiomass moisture content. The results showed that the content of H₂,CO increased whilethe content of CO₂decreased when the temperature changing from750℃to950℃, andthe highest H₂+CO can reach to78.46%. Besides this when the biomass changed tosmaller particles, the content of H₂and CO also increased and the CO₂decreased at the same time. The drying of sawdust leaded that the content of H₂+CO decreased by7.39%and CO/CO₂reduced to3.18. The best gas we got from the experimental was consisted of85.34%H₂+CO and4.40%CO₂.