流程模拟技术在湛江东兴柴油加氢装置上的应用

应用Aspen Plus软件,对湛江东兴石化150×104t/a柴油加氢改质装置进行流程模拟,得到了与装置实际操作接近的理想模型,通过模型分析,为装置优化操作、节能降耗、寻找生产瓶颈提供依据。在实际生产中,应用模型对各塔关键操作变量进行优化,在满足产品质量指标的前提下,优化汽提蒸汽量和稳定塔底温度,将硫化氢汽提塔汽提蒸汽量由2.3t/h降至1.8t/h,能够保证脱气效果;将产品分馏塔底汽提蒸汽由4.0t/h降至2.5t/h,柴油闪点温度和石脑油干点温度仍然合格,两项措施共计节约蒸汽2.0t/h,降低能耗(以每天加工原料4000t计算)0.912kg标油/t。将稳定塔底温度控制在175～180℃,吸收稳定系统运行平稳率得到改善,基本杜绝了稳定塔回流罐顶气体经常放火炬线现象,液化气收率由0.3%提高到0.44%。柴油加氢装置实施流程模拟优化操作后,全年实现创效825.1万元。

The Application of Process Simulation Technology in Sinopec Zhanjiang Dongxing Petrochemical Co.'s Diesel Hydrogenation Unit

Using the Aspen Plus software,technicians established an ideal model with parameters close to the actual operating conditions of Sinopec Zhanjiang Dongxing Petrochemical Company′s 150×104t/a diesel hydro-upgrading unit.Through analysis based on the model,the technicians tried to find measures for optimizing the operation of the unit,saving energy and identifying production bottlenecks.The model was applied in actual production to optimize the key operational variables of each column and optimize stripping steam amount and the temperature at the bottom of the stabilizer,while ensuring product quality.The amount of stripping steam in the hydrogen sulfide stripper was reduced to 1.8t/h from 2.3t/h while ensuring degassing effect.The amount of stripping steam at the bottom of the product fractionation column was reduced to 2.5t/h from 4.0t/h.The flash-point temperature of diesel fuel and the dry-point temperature of naphtha remain above the standard.Steam savings from these two measures totaled about 2.0t/h and the amount of energy saved(assuming 4,000 tons of feedstock is processed per day) reached 0.912kg of oil equivalent per ton of feedstock.When the temperature at the bottom of the stabilizer was maintained between 175℃ and 180℃,the stability of the absorption stabilizing system improved,basically no vent burning of the gas at the top of the reflux tank of the stabilizer is necessary anymore and the yield of LPG was raised to 0.44% from 0.3%.Annual economic benefits from the optimization of the unit,based on process simulation,reach 8.251 million yuan.