CAJ | 학술논문

采用热重法对稻草的催化热解特性及反应动力学进行了研究.同时采用Coats-Redfern法对稻草的催化热解过程进行了拟合计算,得到稻草热解的活化能和指前因子.结果表明,酸洗脱灰后稻草热解的初始温度和结束温度都有所升高,稻草的热解反应活性明显降低,热解曲线向高温区移动;而金属盐的加入使稻草的热解曲线向低温区移动,反应活性增加.酸洗后稻草热解活化能升高,加入不同浓度的钾离子、钙离子和镁离子后求得的活化能明显降低,而且加入金属离子的浓度越高,稻草热解的活化能越低.
채용열중법대도초적최화열해특성급반응동역학진행료연구.동시채용Coats-Redfern법대도초적최화열해과정진행료의합계산,득도도초열해적활화능화지전인자.결과표명,산세탈회후도초열해적초시온도화결속온도도유소승고,도초적열해반응활성명현강저,열해곡선향고온구이동;이금속염적가입사도초적열해곡선향저온구이동,반응활성증가.산세후도초열해활화능승고,가입불동농도적갑리자、개리자화미리자후구득적활화능명현강저,이차가입금속리자적농도월고,도초열해적활화능월저.
The properties and reaction kinetics of straw catalytic pyrolysis were investigated using thermogravimetric method. Matching computation was carried out to analyze catalytic pyrolysis of straw with the Coats-Redfern method , through which the apparent activation energy and pre-exponential factors of straw pyrolysis with different catalysts were obtained. The initial temperature and final temperature of straw pyrolysis rose after acid-washing. The pyrolysis curve moved to the higher temperature region because of decreasing straw pyrolysis reaction activity. But when metal salts were added to straw,the pyrolysis curve moved to the lower temperature region because of increasing straw pyrolysis reaction activity. The results indicated that the pyrolysis reaction was enhanced by metal salts. The apparent activation energy of acid-washed straw pyrolysis increased. But the apparent activation energy of straw pyrolysis with potassium,calcium and magnesium ions decreased obviously. The larger the ratio of metal ions,the lower the apparent activation energy of straw pyrolysis.