The Study Of Steam Co-gasification Of Biomass And MSW To Produce Hydrogen-rich Gas

Corn stalks and municipal solid waste(MSW)are the two kinds of solid waste,which production are huge and the calorific value is high,directly discard in the environment will cause serious waste of resources and environmental pollution,while the use of this waste can effectively reduce environmental pollution and improve resource utilization.In this paper,steam co-gasification of corn stalks and MSW to produce hydrogen-rich gas was investigated.(1)The pyrolysis characteristics of single component and mixed component(MSW and corn stalk)were discussed through thermogravimetric analysis and derivative thermogravimetric analysis(TG/DTG),the results showed that there were two main weight loss stages during the pyrolysis of waste paper and rubber,while there was only one main weight loss stage during the pyrolysis of other single component.There were two main weight loss stages during the pyrolysis of all the mixturecomponents,and weight-loss ratio would be influenced by material ratio.What’s more,kinetic studies on each materials were calculated during pyrolysis,the results showed that apparent activation energy of mixture components were less than weighted average,indicading that there were synergistic effects between single components,the addition of corn stalk promotes pyrolysis of MSW.(2)The characteristics of steam co-gasification of biomass and MSW which was carried out in a lab-scale fixed bed has been studied in this paper.The effects of mixing ratio(MSW=100~0 %),pyrolysis temperature(700~950 °C)and steam flow rate(0.5~4g/min)on hydrogen production were investigated respectively,the results indicated that the hydrogen yield is the highest when the ratio of corn stalk is 60 %,the addition of corn stalks promotes steam gasification of MSW.Raising temperature would improve the generation of hydrogen,the maximum hydrogen yield was 51.26 g/kg when the materials pyrolysis at 900 °C with 2 g/min steam flow rate.Steam flow rate and the high temperature increase the content of unbranched low ring aromatic compounds in the tar,and the oxygen compounds were obviously reduced.(3)Experiments of catalytic gasification by adding Alkaline Earth Metals(AAEMs)were studied,the results showed that there was a maximum hydrogen yield of 78.75 g/kg when the addition ratio of CaO was 0.4,and there was a maximum hydrogen production rate of 68.83 g/kg when the addition ratio of MgO was 0.3;there was a maximum hydrogen production rate of 89.81 g/kg When the ratio of CaO/MgO was 2 in the composite catalyst.There was no obviously difference between the properties of the tar produced by catalysis with CaO and MgO,but the purity of tar was higher when pyrolysis with composite catalyst.