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Delayed coking process

A delayed coking and process technology, which is applied in the field of delayed coking process, can solve the problems of increased coking tendency, high investment and energy consumption of coking heating furnace tubes

Active Publication Date: 2009-12-02
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

[0039] The 130°C heavy oil I (see Table 1 for its properties) is pumped and mixed with the circulating oil from the coking fractionation tower, and then enters the preheating furnace (that is, the convection chamber and radiation chamber of the heating furnace of the delayed coking industrial device) to be heated. The preheating furnace The water vapor injection rate is 0.82% (accounting for the amount of heavy oil, the same below), and the temperature of the material at the outlet of the preheating furnace is controlled to be 417°C, and then enters the upflow visbreaking reactor for visbreaking, and the material stays in the visbreaking reactor The time is 42 minutes, the temperature at the top of the visbreaking reactor is 408° C., and the gauge pressure is 0.53 MPa (to overcome the resistance of the system).

[0040] The visbroken mixture exiting the visbreaking reactor enters the heating furnace (i.e. the radiation chamber of the heating furnace of the delayed coking indust...

Embodiment 2

[0049] Visbreaking conditions were the same as in Example 1, but the visbreaking feed did not include cycle oil. After cooling, separating and analyzing the visbroken mixture of the visbroken heavy oil I, the product distribution and main properties of the visbroken heavy oil are listed in Table 3.

[0050] Comparing Table 1 and Table 3, the viscosities of the visbreaking heavy oil at 80°C and 100°C are 51.98% and 47.64% of the raw oil, and the visbreaking effect is obvious.

[0051] Table 3 Product distribution of visbroken heavy oil I and main properties of visbroken heavy oil

[0052]

Embodiment 3

[0054] Investigation on coking tendency of heavy oil and its visbroken in heating furnace tube.

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Abstract

The invention discloses a delayed coking process, which aims to overcome the defects of serious furnace coking and low liquid product yield and the like for a heating furnace in the prior delayed coking process. The delayed coking process is characterized by comprising the following steps: heating input materials to a temperature of between 360 and 460 DEG C in a convection chamber or the convection chamber and an irradiation chamber of the heating furnace, then putting the input materials into a visbreaking reactor to perform cracking reaction; putting reaction products into the irradiation chamber of the heating furnace, heating the reaction products to a temperature of between 480 and 515 DEG C, and then putting the reaction products into a coking tower; and putting oil gas from the coking tower into a coking fractionating tower to perform fractionating. The delayed coking process can improve the delayed coking liquid product yield, reduce the coke yield, prolong the start working period of delayed coking devices, and simultaneously reduce the equipment investment.

Description

technical field [0001] The invention belongs to the field of petroleum refining, in particular to a 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, with the inc...

Claims

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Application Information

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IPC IPC(8): C10G55/04C10G9/00
Inventor 李和杰黄新龙张海燕陈建民秦如意徐江华王晨涯张建成方长生郭永博杜翔王洪彬
Owner CHINA PETROCHEMICAL CORP
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