Studies On Eupatorium Adenophorum Spreng Stem Pyrolysis And Gasification

Because of the energy shortage and the protection of the environment, more attention has been paid to the use of biomass energy technologies, especially biomass pyrolysis/gasification, which has very broad application prospects. Recently, scholars in different countries have done a lot of researches on the use of EAS ( Eupatorium Adenophorum Spreng ) and found out there were still a lot of problems needing to be solved that make the industrial application impossible. Meanwhile, pyrolysis/gasification of EAS is seldom studied. Therefore, it is significant to use the thermo-chemical method to converse EAS into energy, which will provide a new way to solve EAS problem. Here, we stuided effects of different temperature, residence time, particle size, heating rate, atmosphere, gas steam rate on the yields of products, gas composition, density and heat as well as the characteristics of tar and give experimental datas to explore the optimum conditions for different targets.In this paper, TGA showed that EAS pyrolysis process mainly had one decomposition reaction. Smaller particles and faster heating rate can make polymer decompose faster.Results of studies of various conditions on yields of products showed that gas yield, which can up to 70 %, increased with the promotion of temperature, residence time, air flow as well as the decrease of particle size. Tar yield was smaller than 10 %.Results of studies of various conditions on gas nature showed that H2 content, which was up to 70 %, increased with the promotion of temperature, residence time, particle size as well as decrease of heating rate. H2 content is much higher than that got from the already used biomasses; CO content increased with the promotion of temperature; CH4 content declined with the increase of temperature, residence time and heating rate. Heat value of gas was 10 000 ~ 13 500 kJ/m3. Using air as atmosphere can increase CO content but reduce the heat value of gas.Tar GC-MS results showed the aromatics mainly contained phenols with functional groups such as methyl, ethyl, methoxy-, hydroxy-. Butylated hydroxy toluene (BHT) content was the highest. The value of phenol is much higher than the oxygen-liquid fuel. Aromatic compounds (PAH) and biphenyls are seldom, it means the tar was not so toxin that it can be used as fuels which match the environmental emission requirements.In conclusion, making use of EAS as the raw material for pyrolysis and gasification to produce energy is practical. To get products suitable different situations, reasonable considerations of various factors should be needed.