Study On Pyrolysis And Gasification Of Biomass Waste

Along with the world wide advance of industrialization, energy crisis and environmental problems are increasingly becoming the focus of human’s attention. As a clean, renewable energy sources, biomass is gradually being widely recognized. But now, there is still lack of systems and standards of biomass waste used, resulting in a big group of waste biomass resources. This study built on a biomass pyrolysis and gasification experiment platform, through the thermo-chemical method, by using pyrolysis and gasification method, the wastes of biomass are turned to be gases.1) Leaves as raw materials for pyrolysis, by Box-Behnken experimental design to get the best working conditions:temperature, carrier gas flow rates, amount of catalyst at774℃,0.54L/min,4.18g. In this condition, gas production was0.46Nm3/kg. But the composition of CO2was more than25.00%, so the quality of the gas was not very good.2) Leaves as the research object, examine two stage process pyrolysis-catalytic for treatment of biomass waste, gas production as the main response was determined the best working conditions of the two stage process pyrolysis-catalytic:pyrolysis temperature of550℃, catalytic temperature of900℃, the olivine under10-18mesh was used as the catalyst, gas production was0.67Nm3/kg, in which the composition of the combustible gas was H2:46.17%, CO:28.34%, CH4:7.71%, CO2:17.78%.3) By pyrolysis and pyrolysis-catalytic process for dealing with domestic sludge and industrial sludge, because of its higher organic matter content, domestic sludge got58.5%more gas yield than industrial sludge through the pyrolysis gasification process. Raw sludge with water reduction more than90%in volume in this process. The gas production of domestic sludge was0.516Nm3/kg, and the composition of the gas was H2:52.42%, CO:21.94%, CH4:11.24%, CO2:14.40%.4) Different cellulosic raw materials were handled by pyrolysis process, the differences in gas production and gas composition were relatively large. By analysis of the nature of the material and the product results, found ash impact on gas products greatly. Study on the pyrolysis of mixture of domestic sewage sludge and fallen leaves, the product composition can be adapted through the material mixed. Through the H2/CO proportion of gases become better, it will meet the requirements of subsequent product.5) Economic analysis with an example of industrial sludge pyrolysis process, relies on an industrial wastewater treatment plant of30,000t/d. To deal with the wet sludge across the solar heat pump process and SRT process, the moisture content can be turned below20%. In this process, to deal with1t sludge, which water content is80%, by pyrolysis gasification process, could cost135.32RMB, and by-product crude synthesis gas74.88Nm3.