摘要
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。
Due to the involvement of high-temperature and high-pressure reactions,hydrocracking units usual- ly consume large amounts of energy.Domestic hydrocracking units vary greatly in energy consumption levels, with the most efficient and least efficient units having energy consumption differences of even more than two times.Sinopec Jinling Company＇s No.2 hydrocracking unit uses the mixture of Saudi light straight-run wax oil and coker gas oil as feedstock to produce jet fuel,diesel fuel,liquefied petroleum gas,light naphtha,and heavy naphtha.The product scheme is to maximize production of premium middle distillates.The product scheme can also be revised to maximize production of heavy naphtha.The actual processing volume is 153× 10^4t/a.The process of the unit consists of five sections--reaction,fractionation,LPG fractionation and desulfurization,light hydrocarbon recovery and gas desulfurization,and solvent reclamation.When the unit first started operation, its energy consumption exceeded 40kg of oil equivalent per ton of feedstock.The efforts to save en- ergy should concentrate on three areas--saving gas,saving power,and saving steam.The feedstock temperature of the main stripping column lower than the design value and the low discharge temperature at the bottom of the stripping columns are important factors leading to high energy consumption of Sinopec Jinling Compa- ny＇s No.2 hydrocracking unit.Due to these factors,the main stripping column may have poor stripping effects and the sulfur contents of products may be higher than the normal range.Technicians used the Aspen Plus software to simulate the process of the unit and analyzed the effect of the feedstock temperature of the main stripping column and the yields of target products on process energy consumption.With the help of models, they optimized the key operating variables of each column and revamped the heat exchange processes.These measures helped reduce the unit＇s energy consumption and raise the unit＇s economic efficiency while ensuring products produced meet specifications Through potential tapping and efficiency improvement,the optimization could bring the company 4.15 million yuan in economic benefits annually.
出处
《中外能源》
CAS
2014年第2期74-78,共5页
Sino-Global Energy
