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Anti-oxidation and anti-coking hydrocarbon cracking furnace tube and preparation method thereof

A technology for hydrocarbon cracking furnace tubes and cracking furnace tubes, which is applied in the direction of non-catalytic thermal cracking, cracking, petroleum industry, etc. It can solve the problems of easy peeling, cumbersome steps, and damage to the furnace tube matrix, so as to reduce excessive oxidation and prolong operation cycle, reducing the effect of catalytic coking and carburization

Active Publication Date: 2016-05-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The invention provides a hydrocarbon cracking furnace tube with anti-oxidation and anti-coking properties and a preparation method thereof to overcome the cumbersome steps and high cost of coating the inner surface of the furnace tube with an anti-coking and anti-oxidation metallurgical coating in the prior art. High, easy peeling, damage to the furnace tube matrix and other defects, especially reduce the catalytic coking and carburization of the hydrocarbon cracking process, and prolong the operating cycle of the cracking furnace and the service life of the furnace tube, reducing the impact of online coking on cracking Adverse effects such as excessive oxidation and local peeling of the furnace tube in the radiant section of the furnace

Method used

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  • Anti-oxidation and anti-coking hydrocarbon cracking furnace tube and preparation method thereof
  • Anti-oxidation and anti-coking hydrocarbon cracking furnace tube and preparation method thereof
  • Anti-oxidation and anti-coking hydrocarbon cracking furnace tube and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Coupling sheets with the same size and material as Comparative Example 1 were used to prepare the coating according to the method provided by the present invention. Place the coupon and the mass percentage of 60% elemental molybdenum, 30% elemental silicon, and 10% elemental tungsten into a 0.5Pa low vacuum and argon-filled barrel cathode to penetrate molybdenum ions, silicon ions, and tungsten. Ion, temperature 900℃, heat preservation for 5 hours, a gradient concentration of MoSi is formed on the surface of the coupon 2 +W composite permeable layer. The coated coupons were heated to 1200°C at a rate of 20°C / min in an air atmosphere and then oxidized at a constant temperature for 20 hours with a weight loss of 3.83%. X-ray energy dispersive spectrometer (Energy Dispersive Spectrometer for short EDS) was used to analyze the surface element composition of the coupon before and after oxidation. The results are shown in Table 1.

Embodiment 2

[0029] Coupling sheets with the same size and material as Comparative Example 1 were used to prepare the coating according to the method provided by the present invention. Place the coupon and the mass percentage of 60% elemental molybdenum, 30% elemental silicon, 5% elemental niobium, and 5% zirconia in a 0.5Pa low vacuum and argon-filled barrel cathode to penetrate molybdenum Ions, silicon ions, niobium ions, zirconium ions, oxygen ions, at a temperature of 800°C, holding for 6 hours, a gradient concentration of MoSi is formed on the surface of the coupon 2 +Nb+ZrO 2 The composite permeable layer. The coated coupons were heated to 1200°C at a rate of 20°C / min in an air atmosphere, and then oxidized at a constant temperature for 20 hours with a weight loss of 2.06%. X-ray energy dispersive spectrometer (Energy Dispersive Spectrometer for short EDS) was used to analyze the surface element composition of the coupon before and after oxidation. The results are shown in Table 1.

[...

Embodiment 3

[0045] The size used in this comparative example is The material is HK40 alloy furnace tube, which is coated according to the method provided by the present invention. The furnace tube is used as a barrel-shaped cathode, and the mass percentage of 60% elemental molybdenum, 30% elemental silicon, and 10% elemental tungsten are placed in the furnace tube in a low vacuum argon atmosphere at 900°C and 0.5Pa In the middle of the heat preservation for 5 hours, a gradient concentration of MoSi is formed on the surface of the furnace tube 2 +W composite permeable layer.

[0046] Using the cracking conditions and scorching conditions of Comparative Example 3, the furnace tube containing the coating of the present invention was subjected to multiple cracking and scorching cycle tests. The coking amount of different cracking times is shown in Table 4.

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Abstract

The invention provides an oxidation-resistant coking-resistant hydrocarbon cracking furnace pipe and a preparation method thereof. A cracking furnace pipe is used as a barrel-shaped cathode, a molybdenum elementary substance, a silicon elementary substance and a modified material are put into the barrel-shaped cathode, through a glow discharge principle, molybdenum ions, silicon ions and modified substance ions are formed, and a MoSi2-modified substance composite permeable layer is formed on the inner surface of the cracking furnace pipe. The permeable layer can reduce high temperature oxidation and carburization of the cracking furnace pipe, reduce deposition of coke on the inner surface of the cracking furnace pipe in a hydrocarbon steam-cracking process, and obviously prolongs an operation period and a use life.

Description

Technical field [0001] The invention relates to the field of petrochemical industry, in particular to a hydrocarbon cracking furnace tube with anti-oxidation and anti-coking properties and a preparation method thereof. Background technique [0002] The trienes (ethylene, propylene, butadiene) and triphenyls (benzene, toluene, xylene) produced by the ethylene plant are the basic raw materials of the petrochemical industry. The output, production scale and technology of ethylene mark a country’s petrochemical industry. The level of development. The current method of producing ethylene is mainly tube furnace cracking technology, which has been widely used worldwide. [0003] After a period of steam cracking of hydrocarbons in the radiant section of the cracking furnace, a thick layer of coke will be deposited on the inner surface of the furnace tube. The coke layer will increase the thermal resistance of the furnace tube and reduce the heat transfer coefficient. When the coke layer re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G9/20C10G9/16
Inventor 王申祥王国清王红霞郏景省
Owner CHINA PETROLEUM & CHEM CORP