TG-FTIR Experimental Study On Co-gasification Of Pine Sawdust And Lignite

Biomass energy is a clean renewable energy resource. Therefore, the study of the co-gasification of biomass with coal process is one of the crucial areas of the clean utilization of coal. However, the mechanism of the synergistic effect in the co-gasification of biomass with coal process remains unclear. Further studies are necessary to understand the formation of gas products.In this thesis, the Co-gasification experiments of pine sawdust and ligniteare in the TG-FTIR analyzer.The TG-FTIR anaylsis technology is applied to analyze the co-gasification process of pine sawdust, lignite and their mixtures. The influence of mixing ratio, heating rate and reaction atmosphere to the co-gasification process is also studied. The synergistic effect of pine sawdust and ligniteare emphatically analyzed. And the infrared spectrum of gaseous phase products is analyzed.The influence of mixing ratio, heating rate and reaction atmosphere to the co-gasification process is studied through the analysis of the thermogravimetric curve of co-gasification process. The results show that the DTG curve of co-gasification of pine sawdust and lignite has two weight loss peaks, and the first weight loss peak is attributed to the gasification of pine sawdust; the second weight loss peak is attributed to the gasification of lignite. The TG curve and the DTG curve of co-gasification move to the direction of high-temperature side, and the thermogravimetric curve becomes temperature hysteresis, but the reactivityof mixed sample is heightened,as the increase of heating rate. In the stages of drying and pre heating, the thermogravimetric curve is sameon different reaction atmosphere. The thermogravimetric curve was sameon the reaction atmosphere of N2, and CO2was same except the atmosphere of air in the stage of devolatilization. In coke gasification stage, the synergistic effect of co-gasification is most significant when the mixting ratio was1:1, through the analysis of the RMS and MR of co-gasification process. The gaseous phase products of co-gasification are H2O,CH4,CO and some organic carbohydrate, through the infrared spectrum analysis of the gaseous phase products of co-gasification.The Aco and ACH4was decrease and the began precipitation time of CO and CH4was decrease with the increase of pine sawdust in mixting ratio. The began precipitation temperature was incrase and the Aco and ACH4decreases,with the increase of heating rate. The began precipitation time of CO and CH4is invariant in different reaction atmosphere. The time of CO precipitation is the longest, and the quantity of CO precipitation is biggest in the reaction atmosphere of CO2. The time of CH4precipitation is the longest in the reaction atmosphere of N2.