| Based on the requirements of the National Science and Technology Support Program:Research and Utilization Demonstration of Biogas Gas Industry?2015BAD21B00?,this paper aims at how to improve the gasification temperature in the process of biomass gasification to reduce the tar yield,improve the gasification efficiency and gas production quality,A new type of external heating regenerative gasifier is proposed.Through the experimental study and software simulation,the gas production mechanism in the process of biomass gasification and the influence of the operating parameters on the gasification characteristics during the experiment are studied and analyzed,which can provide reference for the design and manufacture of regenerative gasification.In this paper,biomass pyrolysis and steam gasification experiments were carried out on sawdust as raw material.The effects of gasifier temperature distribution,raw material moisture content,particle size and water vapor flux on gas production were studied.The results show that the pyrolysis and gasification of biomass are mainly composed of CO,H2,CH4 and CO2,and the temperature can increase the pyrolysis gasification reaction.The gasification temperature is increased from 700?C to900?C,the increase of gas production from gasification efficiency increased by 70%,reaching 72%;The reduction of moisture in raw materials is conducive to the production of H2 in the gas,while can effectively reduce the CO2 component content.The results show that the content of H2 in the gas is increased by 11.98%,and the CO2content decreases from 16.96%to 10.26%after the drying process.The smaller the particle size is,the more favorable to the heat transfer.When the particle size is decreased from 80 mesh to 100 mesh,and the gas production is increased by 34.8%to1.51m3 kg.The appropriate water vapor is used to improve the gas production in the gasification process.Flux,can promote by-product tar and coke cracking,thereby promoting water gas reaction.When the S B is 1.4,the H2 content is increased by27.76%and the gas production increased to1.49 m3 kg,which is 25.21%,compared with the case where the water vapor is not introduced.Based on biomass pyrolysis gasification experiment and gasification kinetics,a simulation model of biomass gasification process was established by using process simulation software.And the model parameters are corrected by comparison with the experimental data.The influence of the change of operating parameters on the gasification reaction was studied by using the modified model.The model can predict the gasification reaction more accurately,and provide the theoretical basis for the optimization of the operation parameters of the gasifier. |
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