Study On Co-Combustion Characteristics Of Furfural Residue And Oil Shale Semi-Coke And Solid Product Analysis

Oil shale semi-coke is a solid by-product waste produced by oil shale in the process of retorting refined shale oil.The furfural residue is organic waste produced by hydrolyzing furfural from corn cob.At present,most shale oil refining enterprises and furfural plants have not carried out harmless resource treatment,but instead use the method of dumping and disposal,resulting in a large amount of available cultivated land being occupied and polluting the ecological environment.Since both have a certain calorific value,they are wasted a lot of energy resources.In response to this problem,this paper explores a new approach to waste resource utilization by using oil shale semi-coke and furfural residue.Through the different combustion characteristics of oil shale semi-coke and furfural residue,conduct a deeper study of co-combustion characteristics..Firstly,This article respectively using thermogravimetric analyzer to pools shale semicoke,furfural residue and the mixtures of different proportion of 10℃/min,20℃/min,40℃/min and80℃/min under the heating rate of combustion test.The experiment conducted an in-depth study of the effects of mixing ratio and heating rate on the co-combustion characteristics of the two.The results show that the Wangqing oil shale semi-coke combustion process can be divided into the combustion phase,the mineral decomposition stage and the fixed carbon combustion stage.The combustion process of furfural residue can be divided into lignin and cellulose cracking stages,volatile analysis combustion combustion stage and fixed carbon combustion stage.Increasing the heating rate,the combustion law of the same sample did not change qualitatively,the suitable heating rate is beneficial to improve the combustion characteristics of the mixed sample.With the increase of the mixture ratio of furfural residue,the flammability index,the stable combustion characteristic index and the comprehensive combustion characteristic index all increased,indicating that the addition of furfural residue can well improve the combustion characteristics of Wangqing oil shale semi-coke.Secondly,the synergistic effect of the mixed combustion of Wangqing oil shale semi-coke and furfural residue was analyzed.and the mixed kinetics of Wangqing oil shale semi-coke and furfural residue were calculated using the Flynn-wall-ozawa method and the Friedman-Reich-Levi method.The results show that the co-combustion of Wangqing shale semi-coke and furfural residue has a certain synergistic effect.Appropriately increasing the heating rate and furfural residue blending ratio can effectively promote the co-combustion of Wangqing oil shale semi-coke and furfural residue.The calculation results of the two kinetic methods are the same,and the correctness of the activation energy calculation results is ensured.The co-combustion reaction process is complex and mutable,and is not a simple superposition of single fuel combustion.Finally,the microstructure of solid products after combustion was studied by scanning electron microscopy,energy dispersive spectrometer,fully automatic specific surface area and porosity analyzer.The research show that the content of Na,Mg and other trace elements on the surface of solid products increases after combustion reaction.and the C and O elements on the surface of solid products were mainly from silicate,carbonate minerals and fixed carbon.and the percentage of silicate mineral atoms is higher than that of carbonate minerals.The surface structure of Wangqing oil shale semi-coke combustion products is more compact,the surface of furfural residue ash sample presents granular structure,finer fragmentation,and the surface micro-pore is more developed.The adsorption isotherms belong to the second type of adsorption isotherms,class B adsorption hysteresis loop.The pore structure is parallel-wall slit type capillary pores,and the pore size is mainly concentrated in 2~50nm,The accumulative pore volume is greatly influenced by the number of mesopores.Increasing the blending ratio of furfural residue is beneficial to pore development.The pore volume and specific surface area are the largest at the heating rate of 10℃/min.