比大循环比操作更有效的降低蜡油收率的延迟焦化技术

提出了有别于大循环比操作方式且更有效的降低蜡油收率的延迟焦化技术：在现有延迟焦化装置的基础上，增加焦化蜡油补人原料系统的设施，改变普通延迟焦化操作方式，在一个焦炭塔操作周期的后期一段时间内，通过切换焦化蜡油为装置进料，提高加热炉出口温度10～20℃，实现焦化蜡油深度热裂化，提高其单程转化率。该方法与循环比为0．8的普通延迟焦化操作相比，焦化蜡油收率下降到2．89％，焦化汽油收率增加了2．8个百分点，焦化柴油收率增加了4．7个百分点，焦炭加富气收率下降了2．46个百分点，焦炭的挥发分下降了1．49个百分点，综合能耗降低了82MJ／t。

DELAYED COKING TECHNOLOGY TO REDUCE CGO YIELD MORE EFFECTIVELY THAN LARGE CIRCULATION RATIO OPERATION

Delayed coking technology to reduce CGO yield more effectively than large circulation ratio operation has been proposed. On the basis of existing delayed coker, the facilities have been set up to introduce CGO into the feedstock system, the operation mode has been modified and the unit feedstock has been altered with CGO during the late part time of a coker drum so as to increase the outlet temperature of the furnace by 10C ~ 20C Deep thermal cracking of CGO has been realized and single-pass conversion rate increased. Compared to the common delayed coking operation with the circulation ratio of 0.8, CGO yield has been reduced by 2.89% , naphtha increased by 2.8 percent points, gas oil increased by 4.7 percent points, yields of coke and rich gas reduced by 2.46 percent points, and the volatile matter of coke reduced by 1.49 percent points. Meanwhile, comprehensive energy consumption has decreased by 82 MJ/t.