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N-甲酰吗啉(NFM)以其优良的化学和热力学稳定性,以及无毒、无腐蚀性,越来越被国内外的学者关注。目前,以NFM为溶剂的芳烃萃取精馏工艺已经在我国用于工厂生产。本文以某焦化厂的实际工艺为例,利用Aspen Plus软件,建立了以NFM为萃取剂的芳烃萃取精馏工艺流程模型,模拟结果与工业实际状况吻合良好。在此基础上,对现行工艺进行节能优化。利用Aspen Energy Analyzer软件,按照夹点技术的设计法则,综合考虑设备费用和操作费用,确定最佳夹点温差是10℃。据此设计出合理的换热网络,以实现节能优化的目的。通过经济核算,此换热网络提供的节能方案,可实现热公用工程的用量节省30.93%、冷公用工程降低31.66%,年总费用减少13.7%。
N-Formylmorpholine (NFM) has drawn more and more attention from scholars at home and abroad for its excellent chemical and thermodynamic stability, as well as its non-toxic and non-corrosive properties. At present, NFM as aromatics extractive distillation process has been used in factories in our country. In this paper, a coking plant for the actual process, for example, the use of Aspen Plus software, NFM as an extractant to establish aromatics extractive distillation process flow model, the simulation results in good agreement with the actual state of the industry. On this basis, energy-saving optimization of the current process. Using Aspen Energy Analyzer software, in accordance with the design rules of the pinch point technology, considering the equipment cost and operating cost, it is determined that the best temperature difference between the pinch points is 10 ° C. Accordingly, a reasonable heat exchange network is designed to achieve the purpose of energy saving optimization. Through economic calculation, the energy saving scheme provided by this heat exchange network can save 30.93% of the amount of heat public works, 31.66% of cold public works and 13.7% of annual total expenses.