Experimental Study On Copper Residue Catalytic Gasification Of Ethyl Acetate In Bio-oil

Bio-oil is a kind of renewable energy which comes from a wide range of sources and is clean and environmentally friendly.However,as a primary fuel,its complex chemical composition and characteristics determine that the application scope is limited,so it is necessary to deeply explore the specific behavior and mechanism of various chemical components in bio-oil during the process of thermochemical reaction.In this paper,the mechanism of pyrolysis and gasification of ethyl acetate,a major component of bio-oil,and the pyrolysis characteristics of copper slag as catalyst were studied.There are different competing pathways in the pyrolysis reaction of ethyl acetate,which will affect its product distribution.After the initial molecular reaction of ethyl acetate,the two main acetic acids,cis and trans,were obtained.In the subsequent competition,decarboxylation and dehydration were performed.Finally,gas products including CH₄,CO,CO₂,H₂O,other types of oligomers,and carbon deposits are obtained.In the ethyl acetate pyrolysis gasification reaction without water vapor,in general,the effect of carrier gas flow on the pyrolysis and gasification of ethyl acetate exists but is relatively small.A carrier gas flow of 50 ml/min most ideally promotes the secondary reaction of ethyl acetate pyrolysis.The improvement of H₂ production and content improves gas quality.At a reaction temperature of 900?,the calorific value of the pyrolysis synthesis gas and the final gasification efficiency reach the maximum value,while ensuring the conversion rate of the synthesis gas.Under the reduction of ethyl acetate,copper slag reduces the original high-valent iron compounds to low-valent iron compounds and simple substances.In the process,the macromolecular substances generated by the pyrolysis reaction are cracked again,it also provides a reactive site for it,which increases the yield of pyrolysis gas,calorific value of gas production,gasification efficiency,conversion rate of syngas,and conversion rate with fixed carbon in raw materials.When the liquid hourly space velocity LHSV=6m L/(g-cat·h),it can ensure that the ethyl acetate raw material and the copper slag of unit mass have sufficient interaction in the reactor in unit time,promote the pyrolysis and gasification reaction of raw material to fully carry out,and obtain a higher syngas conversion rate,gas calorific value and gasification efficiency that meet the cost requirements.In the ethyl acetate steam reforming reaction involving water vapor as a gasification agent,it was finally determined that the calorific value of the recombined gas and the final gasification efficiency reached the maximum value at a temperature of 800?while maintaining a large syngas conversion rate.The participation of copper slag significantly promoted the thermal steam reforming of ethyl acetate by promoting the decomposition of C₂ gas in the low temperature section and the steam reforming of CH₄ in the high temperature section,compared with ethyl acetate steam reforming without copper slag participation.For the chemical reaction,the product yield,volume fraction,and synthesis gas conversion rate of the reformed reaction after adding copper slag at the same temperature have significantly increased.When the reaction temperature is 900?,the calorific value and gasification efficiency reach the maximum value.The change of S/C promotes the formation of more CH₄,CO,H₂,and CO₂ by increasing the adsorption amount of-OH formed by the dissociation of water vapor at the reactive sites in the copper slag,and at the same time promotes the methane reforming reaction gets more syngas CO and H₂.But for the calorific value and gasification efficiency,the change of S/C affects the percentage content of each gas in the final gas production,so that the values of these two indicators continue to increase with the increase of S/C,and It reached the maximum value at the minimum value of S/C=0.3 set in this experiment,which were5666.95k J/kg and 22.19%,respectively.