重油浅度热裂化反应深度对延迟焦化过程的影响

摘要

As the feedstocks of delayed coker become heavier and inferior,there are more challenges for coker unit,such as higher liquid product yield,long-term and safe operation,environmental protec-tion and capacity of the unit. A new process named ADCP which integrates a mild thermal cracking stage with a deep thermal cracking stage with one furnace in a coking unit is realized by LPEC for higher liquid product yield. Studies were conducted in LPEC pilot plant with visbreaking,delayed coking and continuous distillation to investigate the effect of heavy oil mild thermal cracking depth on the properties and compositions of coking products. The results show that the yields of liquid products are improved by 0. 48,0. 97 and 1. 71 percentage points,respectively when visbreaking ratios of heavy oil are 33. 03%,52. 43%and 78. 21%. The yields of light liquid products are increased by 1. 04,1. 11 and 2. 19 percentage points,respectively,compared with that of the traditional process. The improvement in light oil yields is mainly manifested in yield increase of the diesel fraction. However,the properties of ADCP products are almost the same as the ones of traditional process products,so the new process has no neg-ative effects on down-stream processes.%为了提高延迟焦化的液体产品收率，中国石化洛阳工程有限公司对现有工艺进行改进，把浅度热裂化反应和深度热裂化反应有机地结合在一起，开发出了ADCP新工艺。在新研制的减黏-焦化-连续蒸馏联合试验装置上考察了劣质重油浅度热裂化深度对焦化产品分布的影响。结果表明，当重油的减黏率分别为33．03％，52．43％，78．21％时，与常规工艺相比，液体产品收率分别提高了0．48，0．97，1．71百分点，其中轻质油收率分别提高了1．04，1．11，2．19百分点，轻质油收率的提高主要体现在柴油馏分收率提高上，而焦化汽油、柴油和蜡油等产品的性质与常规工艺的产品无明显区别，不会影响各产品的后续加工过程。