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加氢裂化装置由于涉及高温高压反应,装置能耗较高,而国内加氢裂化装置的用能水平更是参差不齐,用能水平最高与最低的装置之间,其能耗相差达2倍以上。金陵石化Ⅱ套加氢裂化装置以沙轻直馏蜡油和焦化蜡油的混合油为原料,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,实际处理量达到153×104t/a。该装置由反应、分馏、液化气分馏与脱硫、轻烃回收及气体脱硫、溶剂再生五部分组成,投用初期,能耗超过40kg标油/t原料。装置的节能降耗工作主要应从节约瓦斯、节电和节汽三方面展开。主汽提塔进料温度比设计值低、汽提塔底流出温度低,是导致金陵石化Ⅱ套加氢裂化装置能耗较高的重要原因,同时易造成主汽提塔汽提效果不好、产品的硫含量超标。应用Aspen Plus软件,对该装置进行流程模拟,考察了主汽提塔进料温度及目的产品收率对工艺能耗的影响。应用模型,对各塔关键操作变量进行优化,对换热流程进行改造,在满足产品指标前提下,降低装置能耗,提升装置经济效益。实施后可实现装置挖潜增效415万元/a。
Because of the high temperature and high pressure reactions, the hydrocracking unit consumes more energy and the energy consumption of domestic hydrocracking units is more uneven. The difference in energy consumption between the highest and the lowest energy consumption levels is doubled the above. Jinling Petrochemical Ⅱ sets of hydrocracking unit sand light straight-run wax oil and coker gas oil mixture of raw materials for the production of jet fuel, diesel, liquefied petroleum gas, light naphtha and heavy naphtha, the product program for the production of the highest quality Middle distillate oil, but also to achieve more productive heavy naphtha process scheme, the actual handling capacity of 153 × 104t / a. The device consists of reaction, fractionation, liquefied gas fractionation and desulfurization, light hydrocarbon recovery and gas desulfurization, solvent regeneration of five parts, early investment, energy consumption more than 40kg standard oil / t raw materials. Saving energy and reducing the work of the device should be mainly from the three aspects of saving gas, electricity and steam Festival start. The main stripper feed temperature is lower than the design value, stripper bottom outflow temperature is low, leading to Jinling Petrochemical Ⅱ sets of hydrocracking unit higher energy consumption is an important reason, while easy to cause the main stripper stripping effect is not good , The product of sulfur content exceeded. Aspen Plus software was used to simulate the process of the device. The effects of the main stripper feed temperature and the yield of the target product on process energy consumption were investigated. Applying the model, the key operational variables of each tower are optimized to transform the heat exchange process. Under the premise of meeting the product targets, the energy consumption of the plant is reduced and the economic benefits of the plant are improved. After the implementation of the device to tap the potential efficiency of 4.15 million yuan / a.