蜡油加氢装置用作LTAG加氢单元的实践
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摘要
介绍了中国石化茂名分公司1.8Mt/a蜡油加氢装置用作LTAG加氢单元的装置改造情况和开工过程中出现的问题、解决措施以及装置实际运行效果。工业运转结果表明:通过将催化剂更换为中国石化石油化工科学研究院开发的新一代蜡油加氢处理催化剂,在较低的反应温度和氢分压条件下,可生产硫质量分数为0.1%、氮质量分数为560μg/g的低硫、低氮精制蜡油;掺炼35t/h(约占总进料量的14%)催化裂化柴油后,可生产单环芳烃含量高、多环芳烃质量分数小于15%的加氢柴油,用作LTAG工艺的催化裂化装置进料;所使用的催化剂组合活性较好,综合性能优异;装置掺炼部分催化裂化柴油原料时,反应器入口温度和平均温度降低,反应器温升和氢耗显著提高,综合能耗与加工纯蜡油的工况相当。装置开工运行期间,曾出现轻组分太多造成分馏系统波动较大、冷高压分离器液位不足而无法进一步提高装置处理量等问题,均采取措施得到解决,确保了装置正常生产。
The 1.8 Mt/a VGO hydrotreating unit was modified and used as a LTAG hydrotreating unit in SINOPEC Maoming Company.The modification effect,the problems and solutions during the operation were introduced.The industrial operation results indicated that by using the new generation catalyst system developed by SINOPEC Research Institute of Petroleum Processing,under the conditions of lower reaction temperature and hydrogen partial pressure,low sulfur and low nitrogen refining wax oil can be produced(sulfur 0.1% and nitrogen 560μg/g).After mixing 35 t/h(about 14% of the total feed)catalytic cracking diesel,the hydrogenated diesel with a high content of monocyclic aromatic hydrocarbons and a mass fraction of polycyclic aromatic hydrocarbons less than 15% can be produced and used as LTAG process feed.The composite catalysts exhibit good activity and excellent comprehensive performance.When the feedstock is composed of mixture of LCO and VGO,the inlet temperature and average temperature of the reactor are decreased,while the reactor temperature and hydrogen consumption increased,and the comprehensive energy consumption is similar to that of pure VGO feed.During the start-up of the device,problems such as too many light fractions,large fluctuation of the fractionation system,and insufficient liquid in cold high pressure separator were encountered,leading the inability to further improve the process capacity.These problems were solved by taking measures to ensure the normal production of the plant.
The 1.8 Mt/a VGO hydrotreating unit was modified and used as a LTAG hydrotreating unit in SINOPEC Maoming Company.The modification effect,the problems and solutions during the operation were introduced.The industrial operation results indicated that by using the new generation catalyst system developed by SINOPEC Research Institute of Petroleum Processing,under the conditions of lower reaction temperature and hydrogen partial pressure,low sulfur and low nitrogen refining wax oil can be produced(sulfur 0.1% and nitrogen 560μg/g).After mixing 35 t/h(about 14% of the total feed)catalytic cracking diesel,the hydrogenated diesel with a high content of monocyclic aromatic hydrocarbons and a mass fraction of polycyclic aromatic hydrocarbons less than 15% can be produced and used as LTAG process feed.The composite catalysts exhibit good activity and excellent comprehensive performance.When the feedstock is composed of mixture of LCO and VGO,the inlet temperature and average temperature of the reactor are decreased,while the reactor temperature and hydrogen consumption increased,and the comprehensive energy consumption is similar to that of pure VGO feed.During the start-up of the device,problems such as too many light fractions,large fluctuation of the fractionation system,and insufficient liquid in cold high pressure separator were encountered,leading the inability to further improve the process capacity.These problems were solved by taking measures to ensure the normal production of the plant.
引文
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[2]任亮,蒋东红,胡志海.延长蜡油加氢预处理装置运行周期的技术关键与工业实践[J].石油炼制与化工,2015,46(5):27-31
[3]蒋东红,龙湘云,胡志海,等.蜡油加氢预处理RVHT技术开发进展及工业应用[J].石油炼制与化工,2012,43(3):1-5
[4]鲁旭,赵秦峰,兰玲.催化裂化轻循环油(LCO)加氢处理多产高辛烷值汽油技术研究进展[J].化工进展,2017,36(1):114-120
[5]毛安国,龚建洪.催化裂化轻循环油生产轻质芳烃的分子水平研究[J].炼油技术与工程,2014,45(7):1-6
[6]吕海宁,许楠,王辉,等.LTAG技术对蜡油加氢装置的影响及分析[J].石油炼制与化工,2017,48(1):14-18
[7]龚剑洪,毛安国,刘晓欣,等.催化裂化轻循环油加氢-催化裂化组合生产高辛烷值汽油或轻质芳烃(LTAG)技术[J].石油炼制与化工,2016,47(9):1-5
[8]Li Xiao,Xie Chaogang,Wei Xiaoli.Research progress in catalytic cracking reaction of tetralin and decalin[J].China Petroleum Processing and Petrochemical Technology,2017,19(4):47-54
[9]崔守业,许友好.加氢循环油与加氢蜡油混合作为催化裂化进料试验研究[J].石油炼制与化工,2018,49(9):1-5
[10]习远兵,龚剑洪,李明丰,等.LCO加氢处理生产催化裂化原料的加氢深度研究[J].石油炼制与化工,2017,48(12):39-43