Pinch analysis was applied to optimize the heat exchange network used in the moisture removal processes of energy plants. The moisture removal process absorbs moisture from natural gas using glycol as an absorbent, and the recycling process then separates moisture from the H2O-rich glycol in a regenerator column by applying the principle of vapor-liquid equilibria. For the dehydration process of a natural gas plant, the heat and mass flows are properly established and calculated by means of a static process model for a utility system embedded in the process based on the properties of natural gas. The results of the calculation generate a T-H composite curve that can be used to compare the pinch and to assess the installation and operating costs for the target temperature. The results show that approximately 61% of the total heat supply can be replaced with low-pressure steam, depending on the optimization of the heat exchanger network of the moisture removal process. Further, the annual operating costs can be reduced by about 17% in this case.

中文翻译：

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使用效用夹点分析优化脱水过程中的换热网络

夹点分析用于优化能源工厂除湿过程中使用的热交换网络。除湿过程使用乙二醇作为吸收剂从天然气中吸收水分，然后再循环过程应用汽液平衡原理从再生塔中的富含 H2O 的乙二醇中分离水分。对于天然气工厂的脱水过程，基于天然气的特性，通过嵌入在过程中的公用事业系统的静态过程模型，适当地建立和计算热量和质量流量。计算结果生成 TH 复合曲线，可用于比较夹点并评估目标温度的安装和运行成本。结果表明，大约 61% 的总供热可以用低压蒸汽代替，这取决于除湿过程的换热网络的优化。此外，在这种情况下，每年的运营成本可以降低约 17%。