Optimization And Experiment Of Biomass Pyrolysis Gasfication And Low Calorific Value Pyrolysis Gas Combustion

With the gradual exhaustion of global fossil energy,the development of biomass energy has become an important development strategy in many countries.The technology of biomass pyrolysis and gasification has gradually become an important method for the clean and efficient utilization of biomass energy,and it has a broad prospect for development.According to the preliminary study of the research group,the cycle process of biomass pyrolysis gasification and low calorific value pyrolysis combustion is proposed in this paper,the research focuses on the design of biomass pyrolysis gasification device,the construction of a porous media burner and realizing the continuous and stable operation of the whole process about gas production and combustion.The experimental study on the characteristics of biomass pyrolysis and gasification was carried out using TG-FTIR with grape branches as an example.The effect of heating rate and reaction atmosphere on the characteristics of biomass pyrolysis and gasification was studied.There is a double effect on the process of pyrolysis and gasification by the heating rate;Compared to the atmosphere of nitrogen,the atmosphere of flue gas can promote the reaction of pyrolysis and gasification and increase the pyrolysis conversion rate of the sample and the calorific value of the thermal gas.I designed a pyrolysis gasification device,the device consists of feed system,gasifier part,purge gas system,temperature control and temperature measurement system.The gasifier is in the form of a fixed bed which contains settling section and reaction section.The pyrolysis and gasification efficiency of the device was increased by adding settling sections and increasing the height of the reaction section,cyclone dust remover is used as a purification device for pyrolysis gas,I produced a test prototype.The experimental study of the pyrolysis gasifier was carried out to investigate the effect of feed rate,pyrolysis temperature and reaction atmosphere on the calorific value of pyrolysis gas.The results show that as the feed rate increases,the percentage of flammable gas in pyrolysis gas and calorific value decrease;Increasing the reaction temperature can promote the reaction of biomass pyrolysis gasification,and the calorific value of pyrolysis gas increases;Compared to the atmosphere of nitrogen,the atmosphere of flue gas is conducive to the reaction of biomass pyrolysis gasification,the average low calorific value of pyrolysis gas can reach 4.3MJ/m~3,it can meet the basic condition of low calorific value pyrolysis gas burning in porous media.Finally,the porous medium burner is used to carry out the experimental study on pyrolysis gasification and pyrolysis gas combustion process,low calorific value pyrolysis gas produced by pyrolysis gasification can be stably combusted in a porous medium burner,the content of pollutants in the flue gas in the combustion process meets the national emission standards.