Experimental Study On Co-pyrolysis Characteristic Of Straw And Coal Blends In A Fixed Bed Reactor

Co-pyrolysis as an important role of co-utilization of coal and biomass was mainly studied ir following work, which is not only the necessary step of co-utilization of coal and biomass process, but also an independent application process. Coal and biomass have different chemical and physical properties. Some synergetic effects might be expected. During this wok, the behavior and possible synergetic effects during the co-pyrolysis of biomass with different coals in a fixed-bed reactor were studied. Investigations on co-pyrolysis of the two fuels will focused on possible synergetic effects ir co-pyrolysis using a range of various controlling parameters:pyrolysis temperature, blending ratio, mixed mode of the samples of the different fuels.The results show that the yield of co-pyrolysis of straw and coal blend based on volatile matters were higher than those of the sum of straw and coal individually during straw and coal co-pyrolysis at900℃. Meanwhile, considerable deviations from the average weighted value of gas yield were detected, especially for straw and Shenfu bituminous coal blend. The more straw was added into blend, the more gas yield producted during co-pyrolysis. Straw addition did not play significant role on the char yield and organic functional groups characterization, however there were less H in chat than average weighted value. When it come to straw and Shenfu bituminous coal co-pyrolysis at700℃,800℃,900℃, the results indicate that gas yield decreased at low temperature (<800℃),while it was similar in gas yield between straw and Shenfu bituminous coal at800℃,900℃.Beside, Straw addition had no effect on char yield and H content in char. Straw and Shenfu bituminous co-pyrolysis in different mix way also was studied and there was most gas yield when Shenfu bituminous coal cover straw during co-pyrolysis. Random pore model can fit char-CO2gasification data well.