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加氢裂化装置涉及高温高压反应,能耗较高、操作复杂。大连石化加氢裂化装置以减压蜡油为原料,生产航煤、柴油、液化气、轻石脑油及重石脑油。产品方案为最大量生产优质中间馏分油,也可实现多产重石脑油的工艺方案。该装置由反应、分馏及气体脱硫三部分组成。应用Honeywell公司的Unisim Design R390软件,采用PR模型建立大连石化3.6Mt/a加氢裂化装置流程模拟模型。基于模型考察了热高分温度对于循环氢纯度的影响,并建立吸收塔模型进行模拟,研究了胺液循环量、操作压力、MDEA浓度等条件改变对吸收效果的影响。结果表明:热高分入口温度由288℃降至275℃,在满足循环氢纯度的前提下,降低装置能耗,提升装置经济效益。实施后,每年可实现装置挖潜增效218.4万元。UniSim具有良好的模拟环境,能够得到准确的低分气处理系统的稳态模型。基于所建稳态模型的操作参数优化,降低装置能耗,每年可实现节约成本303.6万元。
Hydrocracking unit involves high temperature and pressure reactions, high energy consumption, complex operation. Dalian Petrochemical hydrocracking unit uses vacuum oil as raw material to produce jet fuel, diesel oil, liquefied gas, light naphtha and heavy naphtha. Product solutions for the production of the highest quality middle distillates, but also to achieve more productive heavy naphtha process options. The device consists of three parts: reaction, fractionation and gas desulfurization. The flow simulation model of Dalian Petrochemical 3.6Mt / a hydrocracking unit was established by using Unisim Design R390 software of Honeywell and PR model. Based on the model, the effect of hot high temperature on the purity of circulating hydrogen was investigated. An absorption tower model was established to simulate the effect of the change of amine solution circulation, operating pressure and MDEA concentration on absorption. The results show that the temperature of hot inlet decreases from 288 ℃ to 275 ℃. Under the precondition of satisfying the purity of circulating hydrogen, the energy consumption of the device is reduced and the economic benefit of the device is improved. After the implementation of the device every year to achieve 2.184 million yuan tapping potential efficiency. UniSim has a good simulation environment and is capable of obtaining accurate steady-state models for low-scavenging treatment systems. Based on the operating parameters of the steady-state model built to optimize, reducing device energy consumption, annual savings of 3.036 million yuan.