HRDC烃循环技术在延迟焦化装置的工业应用

Commercial application of hydrocarbon circulation technology in delayed coking unit

中国石油吉林石化公司炼油厂采用中国石油大学(华东)重质油国家重点实验室开发的烃循环延迟焦化技术(HRDC)在1.0 Mt/a延迟焦化装置中进行了工业应用。结合装置生产实际,提出了2种工业化测试方案,方案一:自然循环比为0.20,供氢循环比为0.20(以中段回流油为供氢物流);方案二:自然循环比为0.20,供氢循环比为0.20(中段回流油循环比为0.05,轻蜡油循环比为0.15)。方案一在测试过程中受分馏塔能力限制且分馏塔操作难度较大,不能实现长周期平稳生产,而方案二在测试期间的生产较为稳定,因此,选择方案二为工业应用方案。方案二的工业应用结果表明,焦化装置在以减压渣油为主,掺炼16%~20%催化裂化油浆为原料的情况下,石油焦收率降低0.83%,轻油收率和液体收率分别提高1.16百分点和0.79百分点,且方案实施7个月后的经济效益达2 294.49万元,值得在同类装置中进行推广和应用。

State Key Laboratory of Heavy Oil Processing, China University of Petroleum （EastChina）has successfully developed ＂hydrocarbon recycle delayed coking technology HRDC ＂, which was first applied in the 1.0 MM TPY delayed coking unit in PetroChina Jilin Chemical Company. Two commercial test schemes were proposed, i.e. Scheme Ⅰ and Scheme Ⅱ. In Scheme Ⅰ , the recycle ratio is 0.20 and hydrogen supply recycle ratio is 0.20 （ the middle reflux oil is used as hydrogen supply stream） ; In Scheme Ⅱ, the recycle ratio is 0.20 and hydrogen supply recycle ratio is 0.20 （ the middle reflux oil recycle ratio is 0. 05, and the light gas oil recycle ratio is 0.15 ）. As Scheme I was subject to the limitation of the capacity of the main fractionator and the difficulty of fractionator operation, the long-term stable operation of the unit could not be maintained. Whereas in Scheme Ⅱ , the testing operation was stable. Therefore, Scheme Ⅱ was selected for commercial application. The commercial operation of Scheme Ⅱ has demonstrated that, when the feedstock of delayed coker was mainly vacuum residue blended with 16% -20% FCC slurry, the petroleum coke production was reduced by 0.83% , the light oil yield and liquid yield were raised by 1.16% and 0.79% respectively. In the 7 months after the implementation of the scheme, the economic benefit was improved by 22.944 9 million Yuan. This scheme is recommended to be applied in commercial process units.