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A process method and device for delayed coking

A technology of delayed coking and process method, applied in cracking, petroleum industry, non-catalytic thermal cracking and other directions, can solve the problems of liquid fraction easily containing coke powder, affecting the separation effect of vacuum fractionation tower, etc. the effect of

Active Publication Date: 2016-01-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In CN200810012208.X, the decoking powder tank uses an inert solid filler to remove coke powder. When the content of coke powder is slightly larger, on the one hand, the coke powder and viscous oil on the surface of the filler will greatly reduce the efficiency of the filler, and on the other hand, the decoking powder The heavy component at the bottom of the tank still contains a certain amount of coke powder, and this part of the heavy component is sent to the vacuum fractionation tower for further fractionation, which affects the separation effect of the vacuum fractionation tower, and the separated liquid fraction also easily contains coke powder

Method used

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  • A process method and device for delayed coking
  • A process method and device for delayed coking
  • A process method and device for delayed coking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In this embodiment, the attached figure 1 The process flow, this embodiment illustrates the situation of using a higher circulation ratio of 0.4 and a higher furnace outlet temperature of 503°C. In actual working conditions, when the circulation ratio is 0.4, the outlet temperature of the heating furnace of the coking unit generally does not exceed 500°C.

[0029] After the raw material oil from pipeline 1 is mixed with part of the bottom oil from the fractionation tower from pipeline 23, it passes through the convection section 2 and the radiation section 4 of the heating furnace in sequence, and enters the coke tower 5 after heating up to 503°C for reaction. The circulation ratio is 0.4:1 ( In the feed to the coke tower, the mass ratio of the non-fresh raw material oil part to the fresh raw material oil part); the generated coke stays in the coke tower, and the coked oil gas generated enters the flash tower, and the top oil of the settling tank and the extracted part ...

Embodiment 2

[0031] In this embodiment, the attached figure 1 The process flow, this embodiment illustrates the process when the low circulation ratio and low heating furnace outlet temperature often adopted in current actual production are adopted.

[0032] Using the same vacuum residue raw material as in Example 1. After the raw material oil from pipeline 1 is mixed with part of the bottom oil from the fractionation tower from pipeline 23, it passes through the convection section 2 and the radiation section 4 of the heating furnace in turn, and enters the coke tower 5 after the temperature rises to 496°C for reaction. The circulation ratio is 0.1:1 ( In the feed to the coke tower, the mass ratio of the non-fresh raw material oil part to the fresh raw material oil part); the generated coke stays in the coke tower, and the coked oil gas generated enters the flash tower, and the top oil of the settling tank and the extracted part of the fractionation tower The bottom oil is mixed as reflux...

Embodiment 3

[0034] In this embodiment, the attached figure 1 The flow process of this embodiment illustrates the technological situation when the process method adopts a low circulation ratio and a higher heating furnace outlet temperature.

[0035] Using the same vacuum residue raw material as in Example 1. After the raw material oil from pipeline 1 is mixed with part of the bottom oil from the fractionation tower from pipeline 23, it passes through the convection section 2 and the radiation section 4 of the heating furnace in sequence, and enters the coke tower 5 for reaction after heating up to 503°C. The circulation ratio is 0.1:1 ( In the feed to the coke tower, the mass ratio of the non-fresh raw material oil part to the fresh raw material oil part); the generated coke stays in the coke tower, and the coked oil gas generated enters the flash tower, and the top oil of the settling tank and the extracted part of the fractionation tower The bottom oil is mixed as reflux oil and inject...

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Abstract

The invention relates to a delayed coking process and a device. The process comprises the following steps: flash evaporation is carried out on high-temperature oil gas coming from a coke tower top; a liquid phase flow obtained after flash evaporation is divided through gravity or rotational flow sedimentation into a flow containing much coke powder and a flow containing less coke powder; a gas phase flow obtained after flash evaporation enters a fractionating tower to separate coker rich gas, coker gasoline, coker diesel and coker gas oil; the flow containing less coke powder or an oil mixture composed of the flow containing less coke powder and coking distillate oil is used as a backflow of flash evaporation; and after heated by a convection section and a radiation section of a heating furnace, raw oil or an oil mixture of the raw oil and oil at the bottom of the fractionating tower is mixed with the flow containing much coke powder, and the mixture enters a coke tower to react. By the method and the device provided by the invention, quality of a coking product can be raised; influence of coke powder on downstream processes is reduced; yield of a liquid product can be raised; and operational cycle of the device can be prolonged.

Description

technical field [0001] The invention relates to a delayed coking process method and device for improving the yield of liquid products. Background technique [0002] As the world's crude oil resources become heavier and worse, the consumption of heavy fuel oil decreases and the demand for light oil products increases, heavy oil deep processing technology has become the focus of the development of the world's oil refining industry. At present, the main technologies to increase the conversion depth of heavy oil and increase the output of light oil products are still coking, catalytic cracking of residual oil and hydrotreating of residual oil. As a thermal processing process of deep thermal cracking, delayed coking can convert heavy oil into dry gas, liquefied gas, coker gasoline, coker diesel, coker wax oil and coke. It has the advantages of strong raw material adaptability and obvious economic benefits. One of the most important heavy oil conversion technologies. Usually, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G55/00C10G9/16C10G7/06
Inventor 阎龙申海平王子军范启明刘自宾
Owner CHINA PETROLEUM & CHEM CORP
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