Improved delayed coking process

A delayed coking and process technology, which is used in the coking of carbon-containing materials, coke ovens, petroleum industry, etc., can solve the problems of high investment and energy consumption, and the tendency of coking heating furnace tubes to increase.

Active Publication Date: 2009-12-09
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process can alleviate the coking of the coking heating furnace tube and increase the yield of liquid products, but the process consists of two heating furnaces, the investment and energy consumption are relatively high, and the circulating oil is mixed with the vis-reduced oil to remove coking Heating furnaces, which have a greater coking tendency for coking furnace tubes for higher-viscosity poor-quality feeds

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Heavy oil I at 150°C (see Table 1 for its properties) is mixed with circulating oil from the coking fractionation tower and then mixed with 0.65% high-temperature steam, and then enters the preheating furnace (that is, the convection chamber of the heating furnace of the delayed coking industrial device) for heating , the temperature of the material at the outlet of the preheating furnace is controlled to be 385°C; the material exiting the preheating furnace enters the upflow visbreaking reactor for visbreaking, the material stays in the visbreaking reactor tower for 156min, and the top temperature of the visbreaking reactor is 377°C , The gauge pressure is 0.29MPa (to overcome the resistance of the system).

[0044] The visbroken mixture from the visbreaking reactor enters the gas-liquid separation tank for gas-liquid separation. The separated high-temperature oil gas is mixed with the oil gas from the top of the coking tower and then separated in the decoking fractiona...

Embodiment 2

[0053] The 150°C heavy oil II (properties are listed in Table 3) is mixed with the circulating oil from the coking fractionation tower and then mixed with 0.50% high-temperature steam, and then enters the preheating furnace (that is, the convection chamber and radiation chamber of the delayed coking industrial device heating furnace) chamber) heating, the temperature of the control preheating furnace outlet material is 417 ℃; other processes are the same as embodiment 1, and the operating conditions are listed in table 4.

Embodiment 3

[0062] Investigation on coking tendency of heavy oil and its visbroken in heating furnace tube.

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Abstract

The invention discloses an improved delayed coking process, aiming at solving the defects of serious heating furnace coking, low liquid product yield and the like in the current delayed coking processes. The process is characterized in that feeds are heated to 360-460 DEG C in a convection chamber or a convection chamber and a radiation chamber of the heating furnace, and then enter a visbreakingreactor for cracking reaction; heavy oil separated from the reaction product enters the radiation chamber of the heating furnace to be heated to 480-515 DEG C and then enters a coke tower; oil gas out of the coke tower singly enters or enters a fractionating tower after being mixed with the gas in the visbreaking reactor for fractionation. By adopting the process of the invention, the delayed coking liquid product yield can be improved, the coke yield reduced, the operation cycle of the delayed coking unit lengthened and the equipment investment lowered at the same time.

Description

technical field [0001] The invention belongs to the field of petroleum refining, in particular to an improved delayed coking process. Background technique [0002] With the development of the global economy, the demand for light and clean fuel oil is also growing rapidly, and the quality of crude oil is getting worse and worse with the continuous increase of crude oil extraction, mainly manifested in high density, high viscosity, high content of heavy metals, High sulfur content, high nitrogen content, high colloid and asphaltene content, which brings great difficulties to the processing of crude oil, especially the secondary processing of heavy oil. [0003] At present, the processing of heavy oil is mainly based on the decarbonization process, and the delayed coking process has the characteristics of thorough decarbonization, simple process, mature technology, and low equipment investment, and has become one of the important processes for heavy oil processing. However, wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G57/00C10B55/00
Inventor 李和杰黄新龙张海燕陈建民齐文义徐江华王晨涯张建成方长生郭永博杜翔王少锋
Owner CHINA PETROCHEMICAL CORP
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