Effect Of Pretreatment On Structure And Combustion Performance Of Different Micromorphologies Shengli Lignite

The Shengli lignite which from Xilin Gol league of Inner Mongolia was selected as the research object.The inertinite and vitrinite lignite were obtained by manual selection,and the inertinite and vitrinite groups were treated by different pretreatment methods?minerals removal,adding different natural minerals,NaOH treatment?.The structure of the prepared coal samples were characterized by SEM-EDS,FT-IR,XPS,XRD and Raman methods,and the combustion reaction performance of different micromorphologies lignite were characterized by TGA.The results showed that the appearance and thermal stability of different micromorphologies lignite have a certain difference.The inertinite?SLI?structure is loose and has silk silk luster and obvious fibrous structure.The vitrinite?SLV?structure is dense and hard and the appearance is irregular and lumpy,the luster is dark.The thermal stability and ignition point of SLI are higher than SLV.The lignite after acid treatment are influenced the combustion reaction performance and structure of different micromorphologies lignite.The thermal stability and ignition point of lignite after mineral removal increased,and the thermal stability of the inertinite(SLI⁺⁺)was higher than that of the vitrinite(SLV⁺⁺).The combustion reaction performance of SLI⁺⁺was weaker than that of SLV⁺⁺.The characterization results showed that the alkyl side chain of lignite after mineral removal decreased,the degree of disorder decreased,the degree of graphitization increased,and the degree of graphitization of SLI⁺⁺was higher than SLV⁺⁺.The Fe/Al/Si are effected the structure and the combustion reaction performance of different micromorphologies lignite.Fe₂O₃ and FeCl₃ can promote the combustion of lignite and the FeCl₃ promotes better.The FeCl₃ can promote vitrinite(SLV⁺⁺)better than inertinite(SLI⁺⁺).The characterization results showed that the SLI⁺⁺-FeCl₃ and SLV⁺⁺-FeCl₃ appeared in coal samples of Fe OOH structure,The degree of disorder of SLI⁺⁺-FeCl₃ is lower than that of SLV⁺⁺-FeCl₃.The addition of Al element inhibits the combustion reactivity of inertinite(SLI⁺⁺)and promotes the combustion reactivity of vitrinite(SLV⁺⁺).The Si O₂ can inhibits the combustion of inertinite(SLI⁺⁺)and vitrinite(SLV⁺⁺),but the inhibition effect of Si O₂ is not different.The NaOH treatment has a significant inhibition effect on the combustion performance of different micromorphologies lignite.There are two weightless temperature zones in two lignites combustion that treated with NaOH,and the maximum combustion reaction rate of lignite in the vitrinite is higher 60-100?than that of the inertinite.The characterization results show that the carboxylate structure appeared in different micromorphologies lignite treated with NaOH,and the structure of carboxylate was more obvious in vitrinite lignite(SLV⁺⁺-NaOH).NaOH treatment was carried out on two kinds of lignite that with Al element.On the TG curve,there are also two weightless temperature zones on lignite and the temperature of the maximum combustion reaction rate are higher 20-60?than that of the NaOH treated coal sample without Al,and the hysteresis of vitrinite is more obvious than that of the inertinite.NaOH treatment was carried out on two kinds of lignite that with Si element.The maximum combustion reaction rate are lower 70-130?than that of the NaOH treated coal sample without Si and the hysteresis of vitrinite is more obvious than that of the inertinite.