基于速率型低温甲醇洗流程模拟
发布时间:2018-06-04 06:48
本文选题:低温甲醇洗 + Aspen ; 参考:《西安科技大学》2015年硕士论文
【摘要】:粗合成气中酸性气体的脱除是保证下游产品连续生产、质量稳定的关键环节。本文选用溶剂价格低廉、净化度高且适合于大规模处理量的低温甲醇洗工艺。借助于Aspen Plus流程模拟软件,对某化工厂低温甲醇洗脱硫脱碳工艺全流程进行详细的模拟计算与分析。本文先是计算了不同温度压力下各种气体在甲醇中的溶解度及甲醇在不同温度压力下的蒸汽压,研究温度对吸收的影响,从而确定合适的吸收温度是-60℃~-30℃,也为计算溶解度提供了一种简洁快速方便有效的方法。对全流程模拟全局选用PSRK物性方法,并运用速率型塔模型,分别对甲醇洗涤塔、CO2解析塔、H2S浓缩塔、甲醇再生塔及甲醇水分离塔做了详细的计算与分析,对主要物流的温度、压力、关键组成与现场值进行了全面的对比,误差控制在5%以内。考虑到工业实际生产中,原料气量、原料组成及吸收剂温度会发生一定的波动,本文对液气比、甲醇温度、原料气组成进行灵敏度分析,确定出变工况操作条件下为使净化气达到指标所需甲醇的温度及最低用量,并对有效气体回收段的中压闪蒸罐的温度和压力进行灵敏度分析,确定出合理的回收温度是-35℃,压力范围是1.0 MPa~1.2 MPa。对本工段的关键设备甲醇洗涤塔进行了详细的结构计算及水力学分析,确定出关键设备的详细结构及塔性能负荷图。
[Abstract]:The removal of acid gas from crude syngas is the key to ensure the continuous production and stable quality of downstream products. In this paper, a low temperature methanol washing process with low solvent price, high purification degree and suitable mass treatment capacity is selected. With the aid of Aspen Plus process simulation software, the whole process of methanol desulfurization and decarburization at low temperature in a chemical plant was simulated and analyzed in detail. In this paper, the solubility of various gases in methanol at different temperature and pressure and the vapor pressure of methanol at different temperature and pressure are calculated, and the influence of temperature on absorption is studied, and the suitable absorption temperature is determined to be -60 鈩,
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