Delayed coking process with low circulation ratio

A technology of delayed coking and process method, which is applied in cracking, petroleum industry, non-catalytic thermal cracking, etc., and can solve the problems of poor quality of heavy coking wax oil, high construction investment and operating costs, etc.

Inactive Publication Date: 2005-07-27
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0007] The disadvantage of the above-mentioned delayed coking process is that the obtained heavy coking gas oil often contains some impurities carried out from the coke tower, so the quality of the heavy coking gas oil is very poor
[0010] The common feature of the above patents is that in order to improve the quality of heavy coking wax oil, it is necessary to build new solvent deasphalting, solvent refining or hydrofining units, which requires high construction investment and operating costs

Method used

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  • Delayed coking process with low circulation ratio
  • Delayed coking process with low circulation ratio
  • Delayed coking process with low circulation ratio

Examples

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Effect test

Embodiment

[0040] This example illustrates the case of using the low cycle ratio delayed coking process provided by the present invention.

[0041] The same vacuum residue raw material as in Comparative Example 1 is first heated to 360°C through the convection section of the heating furnace, and then enters the raw material tundish. In the raw material tundish, the coking raw material oil and the heavy coked wax oil from the cyclone separator are in a weight ratio of 0.08 : 1 After mixing, it enters the radiant section of the heating furnace and is heated to 500°C, and enters the coke tower for coking, and the coke generated by coking remains in the coke tower; A small amount of cooled heavy coker gas oil is injected into the top of the tank, the residence time of the coker gas in the cyclone separator is 1 minute, the temperature is 430°C, the coke powder and asphaltene carried in the high temperature coker gas are separated, and the purified coker gas into the fractionation tower, sepa...

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Abstract

The delayed coking process with low circulatio ration includes the preheating of fresh coking raw material and mixing with heavy coking wax oil from cyclonic separator in the convection zone of heating furnace, heating in the radiation zone of the heating furnace, coking in coke furnace, purification of the produced coked oil and gas in a cyclone while injection of cold heavy coking wax oil in the top of the coclone, separation of the purified coked oil and gas in the fractionating tower, introducing small amount of heavy coking wax oil to cyclone for use as washing oil; and returning the separated coke powder, asphaltine and washed heavy coking wax oil to mix with fresh coking material. The process of the present invention has high processing capacity and high quality of produced heavy coked wax oil.

Description

technical field [0001] The invention belongs to a non-catalytic thermal cracking method of hydrocarbon oil in the absence of hydrogen, more specifically, a delayed coking process with low circulation ratio. Background technique [0002] Delayed coking is a thermal processing process that converts residual oil into gas, light distillate oil, middle distillate oil and coke by deep cracking. It has the advantages of low investment, simple process, mature technology, and is not limited by the nature of processing raw materials. It is the main means of residual oil processing in today's refineries. [0003] In the conventional delayed coking process, the raw oil enters the fractionation tower after being preheated by the convection section of the heating furnace, and flows into the bottom of the fractionation tower after exchanging heat with the high-temperature coking oil and gas from the coke tower in the tower, and the bottom oil of the fractionation to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G9/00
Inventor 李锐祖德光丁宗禹李明林
Owner CHINA PETROLEUM & CHEM CORP
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