In order to increase the decompression yield and improve the product distribution of decompression line, column internals of decompression tower were replaced by new structured packing, and the related process flow was optimized. After above transformation, the pressure drop of decompression tower decreases 1.15 kPa, the side distillation range drops 20 ℃, VGO pull-out rate increases by 4.78%. Meanwhile, heat transfer final temperature increases by 35 ℃, and device energy consumption reduces the 1.91 kg standard oil/ton.%为提高减压拨出率和改善减压侧线的产品分布，将减压塔塔内件由舌形塔盘更换为新型规整填料，并对相应的工艺流程进行优化。改造后减压塔压降降低1.15 kPa，侧线馏程宽度下降20℃，减压蜡油拔出率提高4.78%，换热终温提高35℃，装置能耗降低1.91 kg标油/t。
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