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Delayed coking process and device

A technology of delayed coking and process method, which is applied in cracking, petroleum industry, non-catalytic thermal cracking, etc. It can solve the problems that affect the separation effect of vacuum fractionation tower, and the liquid fraction is easy to contain coke powder, so as to avoid adverse effects and prolong operation Cycle, improve the effect of liquid collection

Active Publication Date: 2014-09-17
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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  • Delayed coking process and device

Examples

Experimental program
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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 conventional 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 enters the convection section 2 and 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 0.4:1 ( In the feed of 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 cyclone separator 7, and the coke oil gas stays in the cyclone separator...

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 feedstock oil from pipeline 1 is mixed with part of the bottom oil from the fractionation tower from pipeline 23, it enters the convection section 2 and radiation section 4 of the heating furnace in sequence, and enters the coke tower 5 for reaction after heating up to 496°C. The circulation ratio is 0.1:1 ( In the feed of 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 cyclone separator 7, and the coke oil gas stays in the cyclone separator The time is 1 minute, the top oil of the settling tank from the pipeline 20 is mix...

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 fractionation tower bottom oil from pipeline 23, it enters the convection section 2 and radiation section 4 of the heating furnace in turn, and enters the coke tower 5 after the temperature rises to 503°C for reaction. The circulation ratio is 0.1:1 ( In the feed of 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 cyclone separator, and the residence time of the coke oil gas in the cyclone separator For 1 minute, the oil at the top of the settling tank is mixed with the ext...

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Abstract

The invention relates to a delayed coking process which comprises the following steps: high-temperature oil gas coming from a coke tower top enters a cyclone separator in a tangent manner; flushing oil is injected into the top of the cyclone separator; oil gas on the top of the cyclone separator enters a fractionating tower to separate coker rich gas, coker gasoline, coker diesel and coker gas oil; oil at the bottom of the cyclone separator is divided through gravity or rotational flow sedimentation into a flow containing much coke powder and a flow containing less coke powder; 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 flushing oil of the cyclone separator; 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 capable of increasing 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. Usu...

Claims

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Application Information

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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