天然气制甲醇结合蒸汽转化（SMR）和二氧化碳重整（DMR）串并联新补碳工艺探究

Study on Natural Gas based Methanol Production Process by the Combined Process of Steam and Dry Methane Reforming

近年来,大气中CO2的积累而造成的全球变暖已经引起广泛关注.天然气重整(SMR)技术合成甲醇合成气是主要的工艺之一.然而,甲醇反应器中产生了大量的水使氢气的利用率降低,并且过程中CO2的排放量增多加剧了全球变暖的趋势.基于此,本文提出了一种结合蒸汽转化(SMR)和二氧化碳重整(DMR)串并联工艺来实现CO2的高效利用新技术,通过Aspen Plus进行模拟估算,从技术、经济和环境等指标对炉后补碳工艺和联合新补碳工艺进行比较发现联合补碳工艺有很高的利用价值.

Global warming caused by the accumulation of atmospheric CO2 has received widespread attention in recent years. The direct CO2 integration process in NG-based methanol (MeOH) synthesis plant is one of the predominant CO2 utilization technologies. However;a large amount of water produced in the MeOH reactor reducing the conversion rate and the high direct CO2 emissions are caused by the low CO2 conversion rate exacerbating global warming. Hence, we propose an innovative MeOH production approach based on a parallel-series system combining steam methane reforming (SMR) and dry methane reforming (DMR) to achieve a high-efficiency utilization of CO2. The comparative evaluations are carried out using Aspen Plus and the proposed improved process is demonstrated to be more efficient than existing ones from views of technological, economic, and environmental metrics.