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放热反应的反应-分离系统,可通过工艺设计实现能量集成的效果,改变其工艺条件,调整系统能量利用需求。本文提出反应-分离系统逐步优化的能量集成策略,以连续反应合成乙二醇丁醚醋酸酯的生产工艺为例,利用Aspen Plus软件对其进行模拟计算,采用过程模拟技术与夹点技术相结合的办法,以温焓图(T-H图)上冷、热物流之间的匹配关系为尺度,以尽可能减少公用工程能耗为目标,通过调整分离塔塔压实现能量集成。计算结果表明,优化后系统额外添加的冷、热公用工程能耗由原来的185.8 kW降至105.8 kW,仅为优化前的56.9%,全系统能量的利用效率提高,达到系统精馏塔与换热网络能量集成的目的。本文的研究利用模拟软件科学计算与系统整体匹配相结合的方法,对过程工业企业的能量集成有着很大的推广潜力和应用价值。
The reaction-separation system of exothermic reaction can realize the effect of energy integration through process design, change the process conditions and adjust the system energy utilization requirements. In this paper, the energy integration strategy of stepwise optimization of reaction-separation system is proposed. Taking continuous production of ethylene glycol monobutyl ether acetate as an example, the Aspen Plus software is used to simulate the process. The process simulation technology is combined with the pinch point technology Approach, taking the matching relationship between cold and hot logistics on the temperature-enthalpy diagram (TH diagram) as a yardstick, reducing the energy consumption of public works as much as possible, and integrating the energy by adjusting the separation tower. The calculation results show that after the optimization, the additional cooling and heating utilities of the system are reduced from 185.8 kW to 105.8 kW, which is only 56.9% before optimization, and the utilization efficiency of system-wide energy is improved, The purpose of thermal network energy integration. In this paper, the method of combining the scientific computing of the simulation software with the overall system matching is used in the research of this paper, which has a great promotion potential and application value to the energy integration of process industrial enterprises.