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为了降低芳烃装置二甲苯塔换热网络的能量消耗,本文利用Aspen Plus软件建立了芳烃装置中以二甲苯塔为热源的整个换热流程模型。通过对比模型计算值与装置实际标定值,确定了该模型的准确性。在此基础上利用该软件的灵敏度分析功能找到了该换热系统的可调变量,最后以二甲苯塔塔底热负荷最低为目标函数,可调变量为自变量,换热网络中各塔产品质量和换热温差为约束条件,对整个换热系统进行了优化计算,结果表明,优化后的二甲苯塔塔压可降低0.09 MPa,回流比降低0.1,塔底热负荷可减少1510 kW。整个换热系统共可节约能源7774 kW。
In order to reduce the energy consumption of xylene tower heat exchange network in aromatics plant, this paper established the entire heat exchange process model using xylene tower as heat source in aromatics plant with Aspen Plus software. By comparing the calculated value of the model and the actual calibration value of the device, the accuracy of the model is confirmed. On this basis, the sensitivity analysis function of the software was used to find the adjustable variables of the heat exchange system. Finally, taking the lowest heat load of xylene tower as the objective function and the adjustable variable as the independent variable, The results show that the optimized xylene tower pressure can be reduced by 0.09 MPa, the reflux ratio can be reduced by 0.1, and the thermal load on the bottom of the tower can be reduced by 1,510 kW. The entire heat exchange system can save a total of 7774 kW of energy.