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采用热重分析法和热重质谱联用技术并结合FTIR光谱考察了木薯渣的热化学特性,同时研究了厌氧处理的木薯渣和未经厌氧处理的木薯渣的热失量和气态产物的析出行为,结果表明厌氧处理的木薯渣和未经厌氧处理的木薯渣热解都可以分为3个阶段:水析出阶段(25~200℃)、挥发分析出阶段(200~600℃)和无机物的分解阶段(600~1 000℃),但未经厌氧处理的木薯渣在热解主体阶段有机质释放量高。利用TG-MS联用技术考察了2种原料的热解特性,发现两种木薯渣热解主要析出的气体要是H2、H2O、CO、CH4和CO2等,且气体生成曲线趋势类似。同时研究不同升温速率和粒径对木薯渣热解过程和氢气产物析出行为的影响,表明升温速率增加,H2的产率在高温区增加,粒径增大有利于氢气的生成。根据Coats-Redfern积分法计算结果,木薯渣热解主体阶段的可用一级动力学方程描述,升温速率对木薯渣热解的活化能影响不大。
Thermogravimetry and TG-MS combined with FTIR spectroscopy were used to investigate the thermochemical properties of cassava residue. At the same time, the thermal loss and gaseous products of cassava slag and cassava slag without anaerobic treatment were studied. The results showed that the anaerobic treatment of cassava slag and non-anaerobic treatment of cassava residue pyrolysis can be divided into three stages: water precipitation stage (25 ~ 200 ℃), volatile analysis stage (200 ~ 600 ℃ ) And inorganic decomposition stage (600 ~ 1 000 ℃), but without the anaerobic treatment of cassava residue in the main phase of pyrolysis of organic matter release high. The pyrolysis characteristics of the two raw materials were investigated by TG-MS technique. It was found that the main precipitated gases of the two cassava residue pyrolysis were H2, H2O, CO, CH4 and CO2, and the gas generation curves tended to be similar. At the same time, the effects of different heating rate and particle size on the pyrolysis process and the precipitation behavior of hydrogen product were studied. The results showed that the heating rate increased and the yield of H2 increased at high temperature. The increase of particle size was beneficial to the formation of hydrogen. According to the results of Coats-Redfern integral method, the first-order kinetic equation of the main phase of cassava residue pyrolysis can be described. The heating rate has little effect on the activation energy of cassava residue pyrolysis.