Low Temperature Co-pyrolysis Of Lignite And Sugarcane Bagasse

Energy and environmental problems are the focus point in social development,and the low utilization efficiency of coal resources causes the waste of resources and the environmental pollution problems.Therefore,the clean and efficient utilization of coal resources and the seek for alternative energy sources is particularly important.Low temperature co-pyrolysis of biomass and coal can not only actualize the cascade transformation of coal resources,but also expand the utilization of renewable resources.Low temperature co-pyrolysis of lignite and sugarcane bagasse was undertaken in a fixed bed reactor to investigate the influence of different sugarcane bagasse ratio(0%,10%,20%,25%,30%,40%,100%)in lignite on the yields and quality of products in the study.GC-MS and FTIR were used to analyze the component of tars.FTIR,SEM and BET were applied to investigate structure of chars,and the calorific value and the heavy metal ions adsorption capacity of chars were determined.In addition,the interaction between lignite and sugarcane bagasse was investigated by TGA.Results are as follows:(1)The experimental value of products yield deviated from the theoretical value conspicuously at mixing ratio of 20%,and the experimental value of tar yield was 9.61%higher than the theoretical value.(2)GC-MS revealed that the concentration of phenols and aliphatic compounds in the tar increased with the addition of sugarcane bagasse.The phenols content in co-pyrolysed tar reached 20.35%,which increased by 142.26%compared with the calculated values.FTIR indicated that the tar containing aromatic and saturated aliphatic compounds without alkyne compounds.(3)SEM images suggested that co-pyrolysis char had well-developed pore structure compared with coal char;BET revealed that the interaction of sugarcane bagasse and lignite not only improved the surface area of co-pyrolysis char,but also improved the pore size distribution by reducing pore average width;Chars adsorption experiments showed that the lead ion removal rate of coal char and bio-char reached 78.42% and 87.80% respectively.(4)The sugarcane bagasse decomposition peak partly overlapped with lignite pyrolysis peak from DTG curves.The deviation between the co-pyrolysis of sugarcane bagasse and lignite DTG curves and the DTG curves of theoretical values proved the existence of synergy.