Visbreaking-coking combined process method by hydrogen generated from heavy oil

A combined process and hydrogen supply technology, which is applied in the direction of only multi-stage series refining and cracking process treatment, to achieve the effects of increasing diesel yield, strong competitiveness, and reducing hydrogen supply costs

Inactive Publication Date: 2012-02-22
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the delayed coking process has certain advantages in terms of investment and operation costs, technical reliability, raw material adaptability, etc., there are still many shortcomings in terms of liquid yield, product distribution, petroleum coke quality, and heating furnace tube coking.

Method used

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  • Visbreaking-coking combined process method by hydrogen generated from heavy oil
  • Visbreaking-coking combined process method by hydrogen generated from heavy oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Fresh heavy oil raw material (a kind of super heavy oil, wherein the viscosity at 80°C is 1454mm 2 / s) and coking narrow fraction (350-420°C) are blended at a ratio of 0.05-0.50, and the obtained blended oil is subjected to visbreaking process. The reaction conditions are: reaction temperature 420°C, residence time 30min, reaction pressure 0.4 MPa(G), the viscosity-reduced product is separated by a fractionation tower, and the gas and gasoline fractions are separated, and the obtained viscosity-reduced residual oil is subjected to delayed coking processing. The coking reaction conditions are: reaction temperature 490 ° C, coke tower top pressure 0.18MPa(G). Results The product yields of the combined process were as follows: coke yield 11.94%, gas yield 7.42%, liquid yield 80.64%, light oil 54.10% (including diesel oil 32.26%).

Embodiment 2

[0025] Fresh heavy oil raw material (a kind of super heavy oil, wherein the viscosity at 80°C is 1454mm 2 / s) and coking narrow fraction (240-350°C) are blended at a ratio of 0.05-0.50, and the obtained blended oil is subjected to visbreaking process. The reaction conditions are: reaction temperature 420°C, residence time 30min, reaction pressure 0.4 MPa(G), the viscosity-reduced product is separated by a fractionation tower, and the gas and gasoline fractions are separated, and the obtained viscosity-reduced residual oil is subjected to delayed coking processing. The coking reaction conditions are: reaction temperature 490 ° C, coke tower top pressure 0.18MPa(G). Results The combined process yields were as follows: coke yield 12.44%, gas yield 7.46%, liquid yield 80.10%, light oil 55.65% (including diesel oil 32.49%).

[0026] Comparative Example 1: The fresh raw material of heavy oil is directly processed according to the conditions of delayed coking in Example 1, and the p...

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Abstract

The present invention relates to a visbreaking-coking combined process method by hydrogen generated from heavy oil. The process method comprises that: narrow fractions of coking distillate oil are added to raw oil, and are preheated to a temperature of 350-380 DEG C; the resulting mixture enters a visbreaking reactor to carry out a thermal cracking reaction; the resulting oil gas discharged from the tower top of the visbreaking reactor enters a visbreaking and fractionating tower to carry out separation to obtain gas, light distillate oil and visbreaking residual oil; the visbreaking residual oil is preheated to a coking temperature, and then enters a coke tower to carry out a coking reaction; the resulting oil gas discharged from the coke tower enters a coking and fractionating tower to carry out separation to obtain coking gas, gasoline, and narrow fractions of the coking distillate oil; the cycle oil pumped from the bottom of the coking and fractionating tower is mixed with the coking raw oil, and enters the coke tower; the narrow fractions of the coking distillate oil are adopted as the hydrogen donor part to be added to the raw oil to carry out the hydrogen-generated visbreaking reaction. According to the process provided by the present invention, the process provides strong adaptability for the raw materials, the yield of the diesel fuel can be improved, and the hydrogen donor fraction is selected from the combined process provided by the present invention so as to substantially reduce the cost of the hydrogen supplying.

Description

Technical field: [0001] The invention relates to a two-way coupled heavy oil hydrogen supply visbreaking-coking combined process method. Background technique: [0002] With the continuous increase of crude oil's inferiority and heavyness and the change of market demand for light oil products, especially the increasing demand for diesel oil, as a key technology to deal with the deep processing of heavy oil and increase the ratio of diesel to gasoline - delayed coking is becoming more and more important. has received more and more attention. Although the delayed coking process has certain advantages in terms of investment and operation costs, technical reliability, raw material adaptability, etc., it still has many shortcomings in terms of liquid yield, product distribution, petroleum coke quality, and heating furnace tube coking. [0003] Visbreaking is a kind of mild thermal conversion, which mainly produces fuel oil and some middle distillates. Due to the restriction of re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G55/04
Inventor 王宗贤郭爱军刘东沐宝泉陈建涛高飞张艳梅于志敏
Owner PETROCHINA CO LTD
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