Synthesis Gas Production From Gasification-reforming Of Refuse Derived Fuel

As countries continue to raise the awareness of environmental protection,as well as world-wide consensus on the economic and social cycle,governments turn their attention from the traditional energy use solely dependent on fossil resources to renewable resources and waste resources,and as one of the important energy development strategy.The municipal solid waste contains large amounts of hydrocarbons,so it can be considered as renewable energy.By system structure unit and operating parameters optimized use gasification-reforming technolygy,obtain synthesis gas generation skill which is clean and have a reasonable equivalent ratio of H2/CO,and lay the necessary foundation for synthesis fuel.In this paper,RDF(Refuse Derived Fuel)as raw materials,the gasification agent was oxygen and steam,experiment study the effect of oxygen supply ER(Equivalent Ratio),gasification temperature,reforming temperature,and addition of steam S/C(Steam/Carbon)on generation characteristic of synthesis gas,Four addiction of metal additives K,Ca,Mg,Zn,Ce,Si in Ni-based catalyst were studied for the problem of higher tar concentration in this experiment,in order to decomposition of tar concentration,promote the production of hydrogen-rich synthsis gas and effectively regulate H2/CO ratio during RDF gasification-reforming process.After the experimental study,the following conclusions are obtained:(1)The supply of oxygen can effectively inhibit the production of tar,in the range of 0 to 0.2 of ER,the more supply of oxygen,the smaller tar concentration.Under the condition of gasification temperature is 850℃,reforming temperature is 850℃,S/C=3.6,when ER=0.2,the concentration of tar is 4.32g/Nm3 and the tar decomposition rate is 42.01%compared with ER=0.(2)Gasification temperature and reforming temperature are important operating parameters to influence the synthesis gas yield and quality during RDF gasification-reforming process.The increasing of gasification temperature is beneficial to the conversion of RDF to synthesis gas,and it also can increase the gas yield and improve the carbon conversion efficiency,and the increasing of reforming temperature is beneficial to incease the concentration of effective components of synthesis gas.Under the condition of reforming temperature is 850℃,gasification temperature is 850℃,ER=0.06,S/C=4.8,when using the catalyst 4#,the gas yield is 0.684g/Nm3,the carbon conversion efficiency is 86.31%,the concentration of H2 is 43.68vol.%.(3)The addition of steam can promote concentration of H2 of synthesis gas.The addition of steam can improve H2 concentration of synthesis gas,so as to enhance equivalent ratio of H2/CO,the addition of excess steam can decrease the concentration of H2.When the gasification temperature is 850℃,the reforming temperature is 850℃,ER=0.06,the best addition of steam of S/C is 3.6,the concentration of H2 in synthesis gas is 29.37vol.%.(4)Ni-based catalyst plays an important role in generation characteristic of synthesis gas.Four addiction of metal additives K,Ca,Mg,Zn,Ce,Si in Ni-based catalyst exhibited excellent catalytic activity in different oxygen supply(ER=0.02,ER=0.04),gasification temperature(700℃,750℃,800℃,850℃),the addition of steam(S/C=0,2.4,3.6,4.8).Ni-based catalyst can effectively promote tar decomposite,increase the ratio of H2/CO,to improve the gas yield and cold gas efficiency.Under the condition of the gasification temperature is 850℃,reforming temperature is 850℃,ER=0.06,S/C=3.6,when using the catalyst 4#,the concentration of H2 is 44.79vol.%,the ratio of H2/CO is 2.801,the concentration of tar is 3.01g/Nm3,the gas yield is 0.679Nm3/Kg,the low heating value of synthesis gas is 17.47MJ/Nm3,carbon conversion efficiency is 87.17%,the cold gas efficiency is 70.17%.(5)In reforming process,the supply of oxygen,the increase of the gasification temperature and the addition of steam can improving the quality of synthesis gas.