Simulating Research On Plasma Gasification Of Refuse Derived Fuel

With the increasing of the total yield of municipal solid waste,the disposal of municipal solid waste is becoming more and more serious.All countries are looking for an environmental and high-efficiency way of waste disposal.As a promising alternative fuel,Refuse Derived Fuel received more and more attention.Waste Plasma Gasification technology,which has the advantage of efficient,environmental,economical and flexible,is a promising way of handling waste.With the continuous increase of the heat value of MSW,it makes municipal solid waste turns into Refuse Derived Fuel and the RDF Plasma Gasification technology industrializing possibly.Based on the chemical equilibrium model,the whole reforming process of the model of RDF Gasification in a fluidized bed-plasma converter is established and data experimented with Aspen Plus soft.(1)First of all,simulating the typical Refuse Derived Fuel gasification in a fluidized bed,and respectively change ER and water steam volume to analyze the whole reform process of Plasma Gasification.It shows that when the equivalent value of oxygen is 0.25,the output energy is maximized.The temperature of the fluidized bed can be controlled within a reasonable range when the water vapor/primary oxygen volume ratio is 2.4~5.0;When other conditions unchanged,through changing the inlet amount of oxygen and water vapor respectively,the reforming process of RDF Gasification in a fluidized bed-plasma converter(keep the temperature at 1200℃)could be simulated.And it find that the plasma reforming can retard the gas composition,decrease the calorific value of gas and reduce energy conversion efficiency,etc.(2)Simulating the whole reforming process of the model of RDF Gasification in a fluidized bed-plasma converter,based on determined primary inlet amount of oxygen and water vapor,analyzing the influence of respectively change the ratio of secondary inlet amount of oxygen between oxygen intake(OPR)and plasma torch power.It is discovered that when OPR is 0.24~0.3,the temperature of the plasma converter is 1108~1231℃;When the plasma power is 1.2~1.8kW/kg RDF,the temperature of the plasma converter is 1108~1231℃.Increasing the OPR or plasma torch power makes the temperature of plasma reforming area and the ratio of O2 increased,and H2/CO ratio and gas production decreased.Increasing the the calorific value of gas,energy conversion efficiency decreased rapidly;Increasing the plasma torch power,the calorific value of gas increased and the energy conversion efficiency changed a little,but the cold gas efficiency decreased.(3)Keeping the plasma converter temperature at 1200℃,increasing the intake amount of CO2,the proportion of CO2 rate increased while the proportion of H2 rate and the calorific value of gas decreased,and this has little influence in energy conversion.The simulation shows that: keeping the plasma converter temperature at 1200℃,decrease plasma torch power and increase the second intake amount of CO2,the energy conversion,the calorific value of gas,and cold gas efficiency all decreased.The parameters above decreasing slower when injected plasma converter than not.After determining the intake amount of primary O2,secondary O2 and steam,it is reasonable to set the plasma torch power at 0.1~0.2 kW/kg RDF.