乙二醇装置用能分析及节能优化

摘要

以年产20万 t/ a 合成气制乙二醇装置为例，采用夹点技术确定原换热网络的最优最小传热温差，在此最小传热温差下，从局部到整体分析比较乙二醇装置以及其各组成单元的用能情况，提出了优化原换热网络的方案，结果表明：循环水节省51%，中压蒸汽节省19%，低压蒸汽节省90%，节能效果显著，并对乙二醇装置进一步节能提出了相关技术改进的建议。%The pinch technology was employed to determine the optimum and minimum heat transfer temperature difference of the heat exchanger net-works in the 200 kt/ a coal to ethylene glycol plant. At the minimum heat transfer temperature difference, energy consumption analysis of the ethylene gly-col plant was performed from part to whole, and optimization schemes of the heat exchanger network were put forward. The results indicated that remarka-ble energy-saving could be realized, 51% of circulating water, 19% of middle pressure steam, and 90% of low pressure steam were saved. Furthermore, suggestions for further energy-saving were provided.