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Combined pinch and exergy analysis of an ethylene oxide production process to boost energy efficiency toward environmental sustainability

机译：结合对环氧乙烷生产过程进行捏和能值分析，以提高能源效率，实现环境可持续发展

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Ethylene oxide production process is one of the highest energy consumers in chemical industry, and therefore even a slight improvement in its overall efficiency can have a significant impact on the sustainability of the process. Efficiency improvement can be carried out using the exergy-aided pinch analysis outlined in this paper. The overall exergy loss distribution in different unit operations of an ethylene oxide process was first evaluated and mapped out in the form of "visualized exergetic process flowsheet". An initial analysis of the four main functional blocks of the process showed that the exothermic reaction block contained the largest exergy loss (6043 and 428 kJ/kg of internal and external losses, respectively) which can be reduced by isothermal mixing, as well as increasing reaction temperature and reduction in pressure drop. The absorption block was also estimated to have the second highest contribution with total exergy losses of 3640 kJ/kg which were mainly due to the cooling column. These losses were then recommended to be reduced by improvements in the concentration and temperature gradients along the tower. Following the block-wise analysis, exergy analysis was then carried out for individual unit operations in each block to pinpoint the main sources of thermal exergetic inefficiency. Thermal solutions to reduce losses were also proposed in accordance with the identified sources of inefficiency, leading to a comprehensive list of cold and hot process streams that could be introduced to reduce losses. Finally, pinch analysis was brought into action to estimate the minimum energy requirements, to select utilities, and to design heat exchanger network. Thus, the methodology used in this work took advantage of both exergy and pinch analyses. The combined thermal-exergy-based pinch approach helped to set energy targets so that all the thermal possible solutions supported by exergy analysis were considered, preventing exclusion of any hot or cold process stream with high potential for heat integration during pinch analysis. Results indicated that the minimum cold utility requirement could be reduced from 601.64 MW (obtained via conventional pinch analysis) to 577.82 MW through screening of streams by the combined methodology.
机译：环氧乙烷生产工艺是化学工业中能耗最高的能源之一，因此，即使总体效率略有提高，也会对工艺的可持续性产生重大影响。可以使用本文概述的火用辅助收缩分析来提高效率。首先评估环氧乙烷工艺在不同单元操作中的总火用损失分布，并以“可视化的高能工艺流程图”的形式绘制出来。对该过程的四个主要功能模块的初步分析表明，放热反应模块的最大本能损失（分别为6043和428 kJ / kg内部和外部损失）可以通过等温混合来降低，也可以通过增加反应温度和压降降低。估计吸收块也具有第二高的贡献，总火用损失为3640 kJ / kg，这主要是由于冷却塔造成的。然后建议通过改善沿塔的浓度和温度梯度来减少这些损失。在逐块分析之后，然后针对每个块中的单个单元操作进行了火用分析，以查明热能效率低下的主要来源。根据确定的低效率来源，还提出了减少损耗的热解决方案，从而提出了可引入的冷，热工艺流程的完整清单，以减少损耗。最后，收缩分析开始生效，以估计最低能耗，选择公用事业和设计热交换器网络。因此，这项工作中使用的方法学利用了本能分析和夹点分析。基于热能的夹点方法相结合，有助于设定能量目标，因此考虑了用能分析所支持的所有可能的热解决方案，从而避免了在夹点分析期间排除任何具有高热集成潜力的热或冷过程流。结果表明，通过组合方法筛选流，可以将最低冷效要求从601.64 MW（通过常规夹点分析获得）降低到577.82 MW。

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