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Heavy oil processing method

A processing method and heavy oil technology, which are applied in the multi-stage series-connected refining and cracking process treatment, etc., can solve the problems of low liquid yield, high investment and energy consumption, and achieve the effects of simple processing flow, low investment and improved heat transfer efficiency.

Inactive Publication Date: 2014-11-26
LUOYANG PETROCHEMICAL ENG CORP SINOPEC +1
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Problems solved by technology

[0011] In order to solve the technical problems of high investment energy consumption and low liquid yield in the prior art, the present invention provides a heavy oil processing method, which can reduce the yield of dry gas and coke, increase the yield of liquid products, and slow down heating Coking of the furnace tube, prolonging the operation period of the delayed coking unit

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Effect test

Embodiment 1

[0036] according to figure 2 As shown in the process flow, the lower part of the feed heavy oil I (listed in Table 1) at 280 ° C is decoked and fractionated. The lower part of the fractionation tower 4 washes and exchanges heat with the high-temperature oil and gas from the coke tower, and the mixed oil (heavy oil + circulation) at the bottom of the fractionation tower is discharged. Oil) enters the convection section of the coking heating furnace 1 for heating, injects 0.74% (accounting for the amount of heavy oil, the same below) steam in this section of the furnace tube, controls the temperature of the material at the outlet of the section of the furnace tube to be 400 ° C, and then enters the upstream Type shallow thermal cracking reactor 2 stays at a gauge pressure of 2.5 MPa for 62.5 minutes to carry out shallow thermal cracking reaction.

[0037] The mixed material from the shallow thermal cracking reactor is returned to the radiant section of the coking heating furnac...

Embodiment 2

[0049] This example mainly investigates the change of properties of heavy oil I before and after shallow thermal cracking.

[0050] The conditions of the shallow thermal cracking reaction are the same as in Example 1, but the feed to the shallow thermal cracking reactor does not include circulating oil. The mixed oil and gas after the shallow thermal cracking reaction of the heavy oil I is cooled, separated and analyzed. The product distribution and the main properties of the heavy oil produced by the shallow thermal cracking reaction are listed in Table 4.

[0051] Comparing Table 1 and Table 4, it can be seen that the viscosity of heavy oil produced by shallow thermal cracking reaction is significantly reduced, the viscosity reduction rate at 100°C is 74.13%, the distillation range becomes lighter, and the yield of gas and gasoline fractions below 180°C accounts for more 1.56% and 3.92% of the feed, improving the feed properties of the radiant section of the heating furnace....

Embodiment 3

[0055] Investigation on coking tendency of heavy oil and its shallow thermal cracking in heating furnace tube.

[0056] Test principle: The traditional thermal scaling method (temperature difference method) is used to evaluate the coking tendency of heavy oil in the heating furnace tube. After the fluid passes through the coke scale test tube, the temperature decreases accordingly to investigate the coking tendency of heavy oil.

[0057] Test method: At the beginning of the test, the raw material oil is drawn out from the raw material tank with a pump, and input into the coke scale test tube. Control the temperature of the heating furnace to be constant, and keep the flow rate of the raw oil and the temperature of the raw oil at the inlet of the test tube constant throughout the test. At the beginning of the test, there is no fouling in the coke scale test tube, the total thermal resistance is the smallest, and the heat transferred to the fluid by the heating furnace is the m...

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Abstract

The present invention provides a heavy oil processing method. According to the method, a fresh feed material and coking heavy oil are mixed in a fractionation tower, then enter a convection section of a heating furnace from the bottom of the fractionation tower so as to be heated, and then enter a slight thermal cracking reactor for reaction; the material discharged from the reactor returns back to a radiation section of a coking heating furnace; the material heated by the radiation section of the heating furnace is divided into two paths which enter a coke tower respectively from the upper portion (including the top portion) and the bottom portion of the coke tower for deep thermal reaction; oil gas generated from the reaction leaves from the top portion of the coke tower and enters a coking fractionation tower for fractionation; the coking heavy oil after fractionation is adopted as circulation oil and is mixed with the fresh feed material; and the obtained mixed material is discharged out of the coke tower and enters the heating furnace for continuous reaction. With such a method, the yields of dry gas and coke can be reduced; the liquid product yield can be improved; the coking of a heating furnace pipe can be slowed down; and the operation period of a coking device can be prolonged and delayed.

Description

technical field [0001] The invention relates to a petroleum processing method in the field of petroleum refining, in particular to a heavy oil processing method. 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 ...

Claims

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Application Information

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IPC IPC(8): C10G55/04
Inventor 黄新龙李和杰王龙延徐江华王少锋张海燕张瑞风郭永博方长生刘淑芳
Owner LUOYANG PETROCHEMICAL ENG CORP SINOPEC
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