CAJ | 학술논문

甲醇制烯烃（MTO）是现代煤化工发展的新技术，合理的甲醇制烯烃反应器操作模式可以有效提高催化剂的效率和低碳烯烃选择性。采用在工业SAPO34催化剂上实验得到的反应与失活动力学和流化床动态两相模型，结合颗粒停留时间分布模型，对 MTO 单一流化床反应器、二级串联及三级串联反应器进行了模拟，考察了催化剂停留时间、气固并流和气固逆流对甲醇制烯烃反应的影响。模拟结果表明：采用多级串联反应器有利于减小颗粒的返混，使出口积炭量分布更加均匀，催化剂寿命延长；二级气固逆流操作可以提高低碳烯烃选择性及出口催化剂积炭量，催化剂单位生产能力比单级反应器提高24.4%；三级串联、气固逆流反应器可以充分利用各级反应器的不同功能，使总的低碳烯烃选择性提高到79.36%（质量分数），比单级反应器提高1%，同时单位催化剂单程生产能力比单级提高31.1%。
갑순제희경（MTO）시현대매화공발전적신기술，합리적갑순제희경반응기조작모식가이유효제고최화제적효솔화저탄희경선택성。채용재공업SAPO34최화제상실험득도적반응여실활동역학화류화상동태량상모형，결합과립정류시간분포모형，대 MTO 단일류화상반응기、이급천련급삼급천련반응기진행료모의，고찰료최화제정류시간、기고병류화기고역류대갑순제희경반응적영향。모의결과표명：채용다급천련반응기유리우감소과립적반혼，사출구적탄량분포경가균균，최화제수명연장；이급기고역류조작가이제고저탄희경선택성급출구최화제적탄량，최화제단위생산능력비단급반응기제고24.4%；삼급천련、기고역류반응기가이충분이용각급반응기적불동공능，사총적저탄희경선택성제고도79.36%（질량분수），비단급반응기제고1%，동시단위최화제단정생산능력비단급제고31.1%。
Methanol to olefins (MTO) is a new technology of modern coal-to-chemicals industry. The catalyst performance and selectivity of light olefin in the MTO process can be remarkably improved by well-designed reactor operating mode. The simulation of MTO reaction in a single, two and three fluidized-bed connected in series was carried out by using the reaction and deactivation kinetics experimentally obtained on the commercial SAPO-34 catalyst, combined with fluidized-bed dynamic two-phase model and particle residence time model. The effects of catalyst residence time, gas-solid cocurrent and countercurrent flow on the MTO performance were investigated. The simulation results show that the catalyst coke content and selectivity of the light olefin depend on the catalyst residence time. The multi-bed in series operating mode will reduce the particle back-mixing, which results in a more uniform coke distribution and a longer catalyst lifetime. For the gas-solid countercurrent flow of two reactors in series, the second reactor is used to pre-coke the catalysts before entering into the first reactor and therefore the light olefin selectivity and the total coke content are increased. The catalyst production capacity of one pass is increased by 24.4% compared with that of single reactor mode. Three reactors connected in series mode can fully utilize the different functions of each reactor for pre-coking, MTO reaction and post-coking, bring about a 1% increase in the selectivity of the light olefin and a 31.1% increase in the catalyst production capacity when compared with the single reactor.