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Method for treating inner surface of hydrocarbon cracking furnace tube

A hydrocarbon cracking furnace tube and a technology for a cracking furnace tube are applied in the field of treating the inner surface of a hydrocarbon cracking furnace tube, which can solve problems such as reducing deposition, and achieve the effects of improving surface roughness, refining grains, and improving anti-coking effect.

Active Publication Date: 2022-05-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for processing the inner surface of the hydrocarbon cracking furnace tube in order to overcome the coking problem existing in the prior art inside the hydrocarbon cracking furnace tube. The oxide protective layer is thinner and not easy to peel off, so that the deposition of coke on the inner surface of the split tube furnace is significantly reduced, and the service life of the oxide protective layer obtained by using this method is longer, which can meet the requirements of long-term use and repeated heating of cracking furnace tubes. Waiting for needs

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  • Method for treating inner surface of hydrocarbon cracking furnace tube
  • Method for treating inner surface of hydrocarbon cracking furnace tube
  • Method for treating inner surface of hydrocarbon cracking furnace tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] A new furnace tube with the same size and material as Comparative Example 1 was used, and the furnace tube was coated according to the method of the present invention. First, the furnace tube was extruded and ground according to the method of Comparative Example 4, and then the furnace tube was treated according to the two-stage low oxygen partial pressure method. In the first stage, let the furnace tube be at a pressure of 0.3MPa, H 2 H with a molar ratio of 4000 to water vapor 2 -H 2 In the low oxygen partial pressure atmosphere, the temperature was kept at 1000 °C for 10 hours; in the second stage, the furnace tube was kept at a pressure of 0.4MPa, H 2 H with a molar ratio of 100 to water vapor 2 -H 2 O in a low oxygen partial pressure atmosphere at 950°C for 30 hours. After cooling, the composition of the inner surface of the furnace tube was analyzed, and the thickness of the oxide layer on the inner surface was tested. The results are shown in Table 2.

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Embodiment 2

[0085] A new furnace tube with the same size and material as Comparative Example 1 was used, and the furnace tube was coated according to the method of the present invention. The furnace tube was first extruded and ground according to the following conditions: (1) abrasive formula, 83% silicon carbide (400 mesh) + 17% vaseline; (2) extrusion grinding pressure, 2MPa; (3) extrusion grinding time, 500 seconds. The furnace tube was then treated according to a two-stage low oxygen partial pressure method. In the first stage, let the furnace tube be at a pressure of 0.3MPa, H 2 H with a molar ratio of 4000 to water vapor 2 -H 2 In the second stage, the furnace tube was kept at a pressure of 0.5MPa, H 2 H with a molar ratio of 120 to water vapor 2 -H 2 O in a low oxygen partial pressure atmosphere (in which nitrogen accounts for 60% of the total gas volume) at 900°C for 40 hours. After cooling, the composition of the inner surface of the furnace tube was analyzed, and the thic...

Embodiment 3

[0088] A new furnace tube with the same size and material as Comparative Example 1 was used, and the furnace tube was coated according to the method of the present invention. The furnace tube was first extruded and ground according to the following conditions: (1) abrasive formula, 83% silicon carbide (400 mesh) + 17% vaseline; (2) extrusion grinding pressure, 2MPa; (3) extrusion grinding time, 500 seconds. The furnace tube was then treated according to a two-stage low oxygen partial pressure method. In the first stage, let the furnace tube be at a pressure of 0.4MPa, H 2 H with a molar ratio of 5000 to water vapor 2 -H 2 In the second stage, the furnace tube was kept at a pressure of 0.35MPa, H 2 H with a molar ratio of 150 to water vapor 2 -H 2 O low oxygen partial pressure atmosphere (in which helium accounts for 50% of the total gas volume) for 40 hours at 1000 °C. After cooling, the composition of the inner surface of the furnace tube was analyzed, and the thicknes...

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Abstract

The invention relates to the field of petrochemical industry, and discloses a method for treating the inner surface of a hydrocarbon cracking furnace tube, wherein the method comprises the following steps: (1) Extruding and grinding the inner surface of a hydrocarbon cracking furnace tube to obtain a pretreatment cracking Furnace tube; (2) In the presence of the treatment gas and under pressurized conditions, the first oxidation treatment and the second oxidation treatment are performed on the inner surface of the pretreatment cracking furnace tube. The method can form a dense, thinner and less prone to peeling oxide protective layer on the inner surface of the hydrocarbon cracking furnace tube, so that the deposition of coke on the inner surface of the split tube furnace is significantly reduced, and the obtained oxide protective layer is treated by this method The service life is longer, which can meet the needs of long-term use and repeated heating of cracking furnace tubes.

Description

technical field [0001] The invention relates to the petrochemical field, in particular to a method for treating the inner surface of a hydrocarbon cracking furnace tube. Background technique [0002] Ethylene is one of the main products of the petrochemical industry. The trienes (ethylene, propylene, butene) and triphenyls (benzene, toluene, xylene) produced by the ethylene plant are the basic raw materials of the petrochemical industry. At present, the method of producing ethylene is mainly based on the tubular furnace cracking technology. [0003] However, when the hydrocarbon feedstock is thermally cracked at high temperature to produce ethylene, coke will be formed on the inner surface of the furnace tube in the radiant section of the tubular cracking furnace. The coke formed at high temperature is a poor conductor of heat, which will increase the heat transfer resistance of the furnace tube and reduce the inner diameter of the furnace tube, resulting in an increase in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G9/20C10G9/16C23C8/16C23C8/02C22C27/06C22F1/11B24B31/116C07C4/04C07C11/04
CPCC10G9/20C10G9/16C23C8/16C23C8/02C22C27/06C22F1/11B24B31/116C07C4/04C07C11/04
Inventor 王申祥柳颖郏景省王红霞王国清张利军
Owner CHINA PETROLEUM & CHEM CORP