Abstract:

The rectisol process has the problems of high operating energy consumption and insufficient CO₂ capture. In order to optimize performance and reduce energy consumption, a "two-stage reduced pressure flash coupled semi-lean liquid circulation" process is designed to reduce regeneration energy consumption while improving CO₂ capture efficiency. The results show that CO₂ production increases by 12.16%. Two "self-heat regeneration" optimization schemes are designed and their heat exchange network designs are carried out. The evaluation is carried out from several dimensions such as energy consumption, exergy loss, CO₂ emissions and annual operating costs. The results show that the two methanol scrubbing processes based on self-heating regeneration have improved scrubbing efficiency and optimized thermodynamic performance compared to the original process. Energy consumption is reduced by 36.98% and 37.20% respectively, and exergy loss is reduced by 26.72% and 26.86% respectively. Annual operating costs are reduced by 17.25% and 15.06% respectively, and unit CO₂ production cost reduced by 13.33% and 10.91% respectively. The improved rectisol process has better performance in terms of economy, energy conservation, emission reduction and environmental protection.

Key words: rectisol, self-heat regeneration, optimal design, computer simulation, economics, exergy

摘要：

低温甲醇洗工艺存在运行能耗高和CO₂捕集不充分的问题。为优化捕集性能、降低能耗，设计了一种“双级减压闪蒸耦合半贫液循环”工艺，降低再生能耗的同时提高CO₂捕集效率，结果显示CO₂产量增加12.16%。设计两种“自热再生”优化方案，并对其进行换热网络设计，从能耗、㶲损、CO₂排放量、年度运行费用、单位CO₂产品成本等多个维度进行评价。结果表明，基于自热再生的两种甲醇洗工艺较原工艺㶲效率有所提升，热力学性能得到优化，能耗分别降低36.98%、37.20%，㶲损分别降低26.72%，26.86%，年度运行费用分别降低17.25%、15.06%，单位CO₂产品成本分别降低13.33%、10.91%。改进后的低温甲醇洗工艺在经济性以及节能、减排、环保方面表现出更好的性能。

关键词: 低温甲醇洗, 自热再生, 优化设计, 计算机模拟, 经济, ?