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Delayed coking equipment for high-acid-containing raw oil and delayed coking method using same

A technology of delayed coking and raw oil, applied in the direction of coking carbonaceous materials, non-catalytic thermal cracking, cracking, etc., can solve the problems of short service life, impact, and increased costs, and achieve good economic benefits and reduce costs.

Active Publication Date: 2010-01-20
CNOOC OIL & PETROCHEMICALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] The material of the above-mentioned delayed coking unit is generally carbon steel. Such delayed coking equipment can generally meet the requirements for the processing of raw material oil with conventional acidity (less than 0.5mgKOH / g). However, when using such equipment to process high-acid raw material Oil, such as the vacuum residue of Penglai high-acid crude oil, cannot meet the anti-corrosion requirements, and the service life of the equipment is short (usually 1-1.5 years), and the product quality is greatly affected by equipment corrosion, which increases the follow-up treatment the cost of

Method used

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  • Delayed coking equipment for high-acid-containing raw oil and delayed coking method using same
  • Delayed coking equipment for high-acid-containing raw oil and delayed coking method using same

Examples

Experimental program
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Effect test

Embodiment 1

[0041] This embodiment is used to illustrate the delayed coking equipment and delayed coking method provided by the present invention.

[0042] The "two furnaces and four towers" delayed coking equipment with a designed processing capacity of 4.2 million tons per year is adopted in accordance with the figure 1 The process shown is to carry out delayed coking on the vacuum residue (>560°C) after atmospheric and vacuum distillation of Penglai PL19-3 high-acid crude oil. One heating furnace is connected with two coke towers as a set, and one coke tower The coke tower is reacted and charged, and the other coke tower that has been charged is used for hydraulic decoking. The two coke towers are switched with a four-way valve, and they are operated in rotation according to the order of tower changing operations. The properties of the vacuum residue are shown in Table 2 below. The main operating conditions for delayed coking include that the operating pressure at the top of the coke t...

Embodiment 2

[0051] This embodiment is used to illustrate the delayed coking equipment and delayed coking method provided by the present invention.

[0052] Delayed coking was carried out on the high-acid feedstock oil according to the method in Example 1. The difference was that, except for the heating furnace, the materials of the other containers were all carbon steel 16MnR steel, and the materials of the pipelines were all 20# steel. After one year of continuous operation of the delayed coking equipment, the corrosion amount was tested according to the method on pages 13-16, Volume 35, Issue 4, 2006 of Shandong Chemical Industry. mm, the corrosion amount of the inlet line of the radiation section is 0.03 mm, the corrosion amount of the outlet line of the radiation section is 0.01 mm, the corrosion amount of the fractionation tower body is 1 mm, the corrosion amount of the tray is 1 mm, and the oil and gas at the top of the tower The corrosion amount of the separation tank is 1 mm, the ...

Embodiment 3

[0054] This embodiment is used to illustrate the delayed coking equipment and delayed coking method provided by the present invention.

[0055] Delayed coking was carried out on the high-acid feedstock oil according to the method in Example 1, the difference is that the acid value of the high-acid feedstock oil was 1.8 mgKOH / g, and the iron content was 40.56 μg·g -1 , The material of the convection tube and radiation tube of the delayed coking equipment is 321H, the material of the inlet line of the radiation section is 321, and the material of the outlet line of the radiation section is 316L.

[0056] After one year of continuous operation of the delayed coking equipment, the corrosion amount was tested according to the method on pages 13-16, Volume 35, Issue 4, 2006 of Shandong Chemical Industry. mm, the corrosion amount of the inlet line of the radiation section is 0.04 mm, the corrosion amount of the outlet line of the radiation section is 0.02 mm, the corrosion amount of ...

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Abstract

The invention provides a delayed coking equipment for high-acid-containing raw oil, comprising a heating furnace, a fractionating tower and a coke tower, wherein the heating furnace includes a convection tube, a radiant tube, a radiation section inlet line and a radiation section outlet line, wherein the convection tube and the radiant tube are made of T9 and / or 321H; the radiation section inlet line is made of 1CrMo5 and / or 321; and the radiation section outlet line is made of P9 and / or 316L. The invention also provides a delayed coking method using the delayed coking equipment. The delayed coking equipment for the high-acid-containing raw oil can effectively solve the problem that the equipment can be corroded by delayed coking the high-acid-containing raw oil; furthermore, as the material with low corrosion resistance or the conventional material can be used at the place which can not be seriously corroded, the equipment cost can be greatly reduced, and better economic benefit is obtained.

Description

technical field [0001] The invention relates to a delayed coking equipment, in particular to a delayed coking and delayed coking method of high-acid feedstock oil. Background technique [0002] Delayed coking is the process of converting heavy oil or residual oil into gas, light oil, middle distillate and coke through deep thermal cracking and polymerization. It is the main means for refineries to increase the yield of light oil and produce petroleum coke. [0003] The delayed coking method includes coking and decoking. Coking is a continuous operation, and decoking is an alternate intermittent operation of two towers. Typical delayed coking unit and delayed coking process such as figure 1 As shown, after the raw oil is heated by the heating furnace, the oil product reaches the required level of coking reaction in the heating furnace in a short time through high flow rate (water injection in the furnace tube) and high heat intensity (heating furnace outlet temperature 500°C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G9/18C10G57/02C10B55/00
Inventor 董孝利吴青张锡泉郑明光陈淳周雨泽李锋梁文彬闻明科
Owner CNOOC OIL & PETROCHEMICALS CO LTD
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