Combined processing method capable of improving coking liquid-phase product yield

Abstract

The invention discloses a combined processing method capable of improving coking liquid-phase product yield. In the method, coke powder is removed from high-temperature oil gases produced by a delayed coking device in a coke powder-removing tank, light components are extracted at the same time, heavy components enter a reduced pressure distillation device to separate a wax oil fraction, and obtained vacuum residues are used as delayed coking feed. The method avoids product fractionation in the prior coking fractional distillation column, thereby greatly reducing investment and operation cost.The method improves the yield of coking waxy oil and ensures the quality of the coking waxy oil. With the increase of the extraction amount of the coking waxy oil, the amount of coking circulation oil is greatly reduced and the processing capacity of the coking device is improved, so the economic benefits are increased.

Description

technical field [0001] The invention belongs to the combined process technology of delayed coking and distillation equipment, in particular, it is a method for maximum production of distillate oil in the process of delayed coking-product flashing and vacuum distillation. Background technique [0002] According to statistics, by 2005, the processing capacity of delayed coking units in the world will reach 226.48Mt / a. It can be seen that the coking process is still one of the important means to deal with residual oil. In terms of how to improve the yield of delayed coking liquid, major companies in the world have researched and developed many technical methods, such as: US5925236, US4784744, US5006223, US7067053, CN1448466A, CN1552799A, CN1487056A, CN1246514A, CN1465658A mainly reveal the improvement of delayed coking process , which increases the liquid yield. However, due to the poor separation precision of the coking fractionation tower, the output of the wax oil cannot be...

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Problems solved by technology

Due to the limitation of the coking fractionation tower process, this technology still cannot achieve satisfactory results in the end

[0003] The coking fractionation tower mainly relies on the heat generated by coking to generate oil and gas to complete the separation of products under normal pressure conditions. Therefore, the separation accuracy of wax oil with a higher boiling point is poor, so that the temperature difference between the 90% point of coking wax oil and the dry point is very large. If If the output of coking wax oil is increased, its quality will become worse, and downstream processing devices will be difficult to process, which will seriously affect the total liquid yield of coking and cause a waste of resources

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