Study On Gasification Experiment Of Biomass Entrained Fluidized Bed Based On Orthogonal Test Method

Facing the energy crisis throughout the whole world,renewable energy resources have been proved to be the substitutes of fossil fuels.Biomass gasification is a simple and convenient technology to transfer biomass to high quality fuel gas.Researches on its gasification characters are needed under any utilization condition.In order to study the biomass heat storage gasifier designed in the project,it is necessary to study the simplified model,that is,single-tube external heating fluidized bed gasification.In this paper,a small-diameter heating fluidized bed gasification experiment device is designed.The special screw feeding system is designed for the biomass micron raw material,the gasification furnace is heated outside the synchronous temperature control,and the three-stage gas purification system.Experiments tested This set of experimental devices can be used to lay the foundation for subsequent experiments.According to the results of the orthogonal test,particle size variation has relative obvious influences on carbon conversion efficiency and relative utilization ratio of carbon;temperature has relative big influence on gasification efficiency as well as carbon conversion efficiency.On the other hand,degree of drying doesn't have as much influence as the former two factors.After the secondary trial based on the orthogonal test conclusion and experiment target,we have known the influence of temperature,particle size and steam input on gasified syngas and gasification effect.Relative carbon utilization ratio(_CR)decreases when the temperature increases;carbon conversion efficiency(_C?)variation tendency is almost in accordance with gasification efficiency(_G?)—they both increases when temperature uprises;with particle size decreases from 60 meshes to 100 meshes,carbon conversion efficiency(_C?),relative carbon utilization efficiency(_CR)and gasification efficiency(_G?)increase;when steam input increases,relative carbon utilization ratio(_CR)decreases,while carbon conversion efficiency(_C?)and gasification efficiency(_G?)increase first then decrease which both reach maximums when S/B equals 1.4.