A process for increasing the production of coked diesel oil

A process method and technology for coking diesel oil, which are applied in the petroleum industry, processing hydrocarbon oil, hydrocarbon oil processing products, etc., can solve the problems of increasing the load of the coking main fractionation tower, increasing the unit cost of recovering diesel oil, increasing the tower top condensation cooling load, etc. Achieve the effect of reducing the flow of acidic sewage, saving energy and reducing consumption, and increasing the economic benefits of the device

Active Publication Date: 2016-08-17
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of superheated steam to strip coker wax oil increases the unit cost of diesel oil recovery on the one hand; on the other hand, it also increases the load of the coking main fractionation tower, increases the condensation cooling load at the top of the tower, and increases the amount of sulfur-containing sewage

Method used

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  • A process for increasing the production of coked diesel oil
  • A process for increasing the production of coked diesel oil

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Effect test

Embodiment 1

[0044] The method of the present invention is used in a certain 2 million tons / year delayed coking unit.

[0045] A stripper is installed in the side line production of coking wax oil, and the properties of coking wax oil recovered by steaming in advance are shown in Table 1. The stripping operation is carried out using coke dry gas. The composition of coking dry gas is shown in Table 2. The diesel fraction in the coker wax oil is recovered by stripping operation, so that the initial boiling point of the coker wax oil reaches 311°C, and the yield of the coker wax oil is calculated as 20% of the raw material. The simulation calculation results are shown in Table 3.

Embodiment 2

[0062] The method of the present invention is used in a certain 2 million tons / year delayed coking unit.

[0063] A light gas oil stripper is installed in the side line production of coking gas oil, and the properties of coking gas oil recovered by steam ahead of time are shown in Table 1. The stripping operation is carried out using coke dry gas. The composition of coking dry gas is shown in Table 2. The properties of the light fraction at the top of the wax oil stripper are shown in Table 4. The light fraction at the top of the wax oil stripper enters the diesel stripper, and the properties of the diesel fraction recovered from the bottom of the diesel stripper are shown in Table 4. The diesel fraction in the coker wax oil is recovered by stripping operation, so that the initial boiling point of the coker wax oil reaches 311°C, and the yield of the coker wax oil is calculated as 20% of the raw material. The simulation calculation results are shown in Table 5.

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Abstract

The present invention discloses a process method for increasing the coking diesel fuel yield. The method comprises that: a wax oil steam stripping tower is arranged on the coking main fractionation tower light wax oil side-draw portion; and dry gas from the re-absorption tower top of a coking apparatus absorbing stabilizing unit is introduced into the wax oil steam stripping tower, the oil gas differential pressure of the coking wax oil is reduced, the relatively light diesel fuel distillate is subjected to steam stripping by using the self-heat of the coking wax oil and returns to the coking main fractionation tower from the coking main fractionation tower top or passes through a diesel fuel steam stripping tower and then returns to the coking main fractionation tower, and finally the diesel fuel distillate is extracted from the diesel fuel steam stripping tower. With the method of the present invention, the diesel fuel yield of the delayed coking apparatus can be significantly improved, the coking diesel fuel yield increase purpose can be achieved, the energy consumption of the apparatus can be reduced, the economic benefit of the apparatus can be increased, and the equipment investment can be saved.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a process method for increasing the production of coked diesel oil. More specifically, it is a process for recovering cokered diesel oil in coker wax oil. technical background [0002] Delayed coking process is that oil refineries use thermal cracking process to crack and condense heavy oil (such as heavy oil, vacuum residue, cracked residue, etc.) under high temperature conditions to produce gas, gasoline, diesel oil, wax oil and petroleum coke The process is one of the main processes for deep processing of petroleum, and it is also the most mature and cheapest heavy oil lightening process. The liquid products of the coking process are mainly coker gasoline, coker diesel oil and coker gas oil. [0003] The cetane index of coking diesel oil is relatively high (up to 50 or more), and after hydrofining, it is the main blending component of vehicle diesel fuel, and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G53/00
CPCC10G53/00C10G2300/4006C10G2300/4012C10G2400/04
Inventor 张龙王海波李经伟王明星王岩李欣
Owner CHINA PETROLEUM & CHEM CORP
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