高效脱水技术在柴油加氢精制装置的应用

Application of high-efficiency dehydration technology in diesel hydrofining unit

介绍了某石化企业0.6 Mt/a柴油加氢精制装置先后新增两套不同的柴油脱水设施的改造情况,从柴油产品脱水效果、油品性质和能耗等角度对两种新型脱水技术进行对比。结果表明,两套设施对柴油均有良好的脱水作用;经过真空干燥脱水后,柴油水质量分数在200~300μg/g,而经过新型液-液聚结器脱水后,柴油产品水质量分数降到200μg/g以下;真空干燥脱水新增单位能耗为22.52 MJ/t,而液-液聚结器脱水新增单位能耗为3.19 MJ/t;液-液聚结器脱水后柴油产品相对于真空干燥脱水后柴油产品更加清澈,乳化明显减少。为使出厂柴油产品含水率合格,选择新型液-液聚结器脱水效果更优。

The revampings of the two different new dehydration facilities in a 0. 6 MM TPY diesel hydro fining unit of a refinery were introduced. The two new dehydration processes were compared in respect of the dehydration efficiency,product properties and energy consumption. The results show that both of the two new facilities have a good impact on dehydration. After the dehydration by vacuum drying,the water content of diesel product is between 200 μg/g and 300 μg/g. And after the dehydration by the new liquid-liquid coalescer,the water content of diesel product is below 200 μg/g. The increased unit energy consumption of vacuum drying dehydration is 22. 52 MJ/t,and the increased unit energy consumption of the new liquid-liquid coalescer is only 3. 19 MJ/t. The diesel product after dehydration of the liquid-liquid coalescer is clearer than that after the vacuum drying dehydration. And the emulsification of the diesel product from the liquid-liquid coalescer is lower. The new liquid-liquid coalescer dehydration is better to be selected to meet the water content specification of diesel product in the standard.