Petroleum Refinery Engineering ›› 2025, Vol. 55 ›› Issue (3): 5-8.

• PROCESSING • Previous Articles     Next Articles

Analysis of the problem of deep cut vacuum distillation of atmospheric and vacuum unit

Tu Liantao, Qiu Wanlong, Gong Chuanbo, Li Xingbiao, Gu Tao   

  1. PetroChina Dushanzi Petrochemical Company
  • Received:2024-10-04 Online:2025-03-15 Published:2025-03-21

常减压装置减压深拔运行问题分析

涂连涛，邱皖龙，龚传波，李兴彪，顾涛   

  1. 中国石油独山子石化分公司
  • 作者简介:涂连涛，高级工程师，2007年毕业于南京工业大学化学工程与工艺专业，主要研究方向为生产优化。E-mail：lyc_tlt@petrochina.com.cn

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Abstract:

At the end of the operating cycle from 2019 to 2024, the deep cut vacuum distillation of PetroChina Dushanzi Petrochemical Company's 10.0 MMTPY atmospheric and vacuum distillation unit experienced a significant increase in vacuum residue yield due to factors such as a significant increase in pressure drop in the packing layer of the vacuum tower washing section and deterioration of crude oil properties, which seriously affected the balance of residual oil. The main factors leading to coking in the packing layer of the wash section and the subsequent accelerated increase in pressure drop include: clogging of the wash oil nozzles, low spray density in the packing layer of the wash section, deterioration of crude oil properties, and excessively high outlet temperature of the vacuum furnace. To ensure a five-year operation cycle, it is recommended that the spray density at the bottom of the packing layer in the wash section of the vacuum tower be controlled at no less than 0.5 m³/(m²·h) in the next cycle. Through empirical exploration and simulation calculation, the optimal matching of the outlet temperature of the vacuum furnace and the top pressure of the vacuum tower should be determined to improve the deep cutting effect.

Key words:

border:0px, font-size:14px, font-family:-apple-system, BlinkMacSystemFont, ", vertical-align:baseline, margin:0.859em 0px, color:#060607, background-color:#FFFFFF, "> atmospheric and vacuum unit, vacuum tower, deep cut vacuum distillation, washing section packing, vacuum extraction rate, crude oil properties, outlet temperature, spraying density

摘要：

中国石油独山子石化分公司10.0 Mt/a常减压蒸馏装置减压深拔在2019—2024年运行周期末期，因减压塔洗涤段填料层压力降大幅上升、原油性质劣化等因素，减压渣油收率大幅上升，严重影响渣油平衡。分析导致洗涤段填料层结焦进而造成压力降上升加快的主要因素：洗涤油喷嘴堵塞、洗涤段填料层喷淋密度偏低、原油性质劣化、减压炉出口温度偏高。为保证装置5 a运行周期，建议装置在下一个运行周期减压塔洗涤段填料层底部喷淋密度按不小于0.5 m³/(m²·h)控制，通过经验摸索和模拟核算，确定减压炉出口温度和减压塔塔顶残压的最优匹配，提高深拔效果。

关键词:

border:0px, font-size:14px, font-family:-apple-system, BlinkMacSystemFont, ", vertical-align:baseline, margin:0.859em 0px, color:#060607, background-color:#FFFFFF, "> 常减压, 减压塔, 减压深拔, 洗涤段填料, 减压拔出率, 原油性质, 出口温度, 喷淋密度