合成循环比对黑液气化制备混合醇的性能影响

Influence of recycle ratio on performance of mixed alcohol synthesis process based on black liquor gasification

为了研究了合成循环比及合成副产物CO2脱除对黑液气化制备混合醇的合成单元及系统性能的影响,基于合成反应详细机理和动力学参数建立了固定床反应器模型,分析了CO转化率、产物选择性、总醇产率、C2＋醇含量和合成尾气参数的变化规律。对黑液气化合成混合醇系统进行流程模拟与物流能流分析,得到了混合醇产量、能量利用效率、蒸汽产量/消耗随循环比的变化趋势。结果表明：以混合醇产率为评价指标,适宜的循环比为3~3.5;循环气体脱碳可显著提高混合醇产率、减少总醇选择性随循环比的下降;调节循环比,可匹配燃气轮机发电与合成混合醇参数、实现混合醇与电力的联产;对气体净化过程损失的有效气进行回收可望将联产系统总能利用效率提高至40%。

To investigate the performances of mixed alcohol （MA） synthesis reactor and black liquor gasification to MA process, a fixed bed reactor with K/MoS, as catalyst was modeled based on the detail reaction mechanism and kinetics parameters, and the variation rules of CO conversion ratio, products selectivities, total alcohol yield, C2.OH mass fraction and tail gas parameters were analyzed. The process of black liquor to MA was simulated to analyze the mass and energy balances, and the influence of recycle ratio on MA yield, system energy efficiency and steam balance were evaluated. The simulation results showed that the recycle ratio of 3 to 3.5 was suitable to maximize the MA yield, and removing CO, from recycle gas could improve MA selectivity and yield obviously. MA synthesis and gas turbine power generation could be integrated by adjusting recycle ratio. It was expected that the total energy efficiency of the MA and electricity co-production system could be up to 40% with the recovery of CO and H2 lost in the gas purification section.