| Fossil fuel is limited and nonrenewable.What’s worse,it brings serious pollution to human living environment.People become to realize it’s urgent to develop and utilize clean and renewable energy.Biomass is a kind of aboudant renewable energy,and hydrogen is an ideal energy carrier.It can be an attractive method to alleviate the energy problem by using biomass resources to produce hydrogen energy.Biomass gasification is a new technology of hydrogen production.In this study,in order to describe its integrated processes,a medium-scale hydrogen production system by biomass gasification is set up and tested through design,manufacture,installation and adjustment.The experimental results show that mass balance in the whole process is realized on this medium-scale system.Gas production and the maximum gas production rate are increased in cracking process.6% nickel base doping olivine has great catalytic effect on tar cracking,which can effectively increase gas production and improve hydrogenyield.In desulphurization process,by using ZnO,content of H2 S of bio-syngas can be decreased from about 20 ppm to below 0.1ppm.Besides,in this study, aimed at bio-syngas,desulphurization experimental research is done. The simulated bio-syngas is made by mixing H2, CO2, H2 S,CO and N2,which reacts with ZnO desulfurizer under different temperatures(200℃,300℃,370℃,430℃) and velocities(1000h-1,2000h-1,3000h-1).Content of H2 S of exit bio-syngas is tested by FPD.The experimental results show that the ideal desulphurizationtemperatureof ZnO is 370℃,under which precision can reach to below 0.1ppm.Penetration time will decrease asvelocity increases.Content of H2 S can be reduced from 190 ppm to below 0.1ppm at 370℃ and 2000h-1,and the penetration time is 10.5h,thus the desulphurization effect is excellent.The penetration time can be extended by decreasing the velocity further.The achievements of this research can be used for reference in the technology of hydrogen production by biomass gasification. |
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