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Study On Adsorption And Decomposition Of Xylene By Enforced Discharge Using Conductive Biomass Charcoal

Posted on:2015-01-03Degree:MasterType:Thesis
Country:ChinaCandidate:R B WuFull Text:PDF
GTID:2251330425481358Subject:Engineering Thermal Physics
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As a kind of important renewable energy, biomass utilization is getting increased attention. Biomass gasification is a method which converts biomass to combustible gas through heating pyrolysis. Excessive tar content in biogas will cause equipment corrosion, pipeline jam, etc. This paper is focus on decomposition of xylene which used as a model of gasification tar. The influence factors on decomposition efficiency of xylene are carried out through dielectric barrier discharge technology, which combined with conductive biomass charcoal (CBC).CBC is preparation by CO2physical activation which used corn cob as raw material. The effects of activation conditions on the structure and conductivity of CBC are explored. Scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET), Fourier transform infrared spectroscopy (FTIR) and resistivity tester are used to identify the characteristics of CBC. The results showed that the specific surface area of CBC enhanced with increasing of CO2flow rate (200mL/min-600mL/min), the conductivity of CBC has a downward trend with increasing of CO2flow rate; with increasing of activation time (0.5h-1.5h), the specific surface area of CBC is increased and then decreased, the activation time has little influence on conductivity of CBC.The CBC which used as adsorbent is prepared at condition of CO2flow rate (400mL/min), activation time (1h), activation temperature (800℃). The absorption experiments of CBC are carried out under different intake flow, intake concentration of xylene and adsorption bed height. The results showed that the slope of adsorption mass transfer zone increased with increasing of intake concentration of xylene and intake flow; the adsorption breakthrough curve shapes are basically the same with the increase of adsorption bed height.The xylene decomposition experiments are carried out by dielectric barrier discharge technology which combined with CBC. The results showed that the characteristic spectral line intensity of discharge is significantly higher when discharge reaction zone is loaded with CBC, which means a stronger discharge. After treatment of plasma, pore structure of CBC is destroyed and inner holes become drape, while the resistivity and surface functional groups of CBC changed little.
Keywords/Search Tags:biomass, conductive biomass charcoal (CBC), xylene, dielectric barrierdischarge, decomposition
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