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Oxidation-resistant coking-resistant hydrocarbon cracking furnace pipe and preparation method thereof

A kind of hydrocarbon cracking furnace tube and cracking furnace tube technology, applied in non-catalytic thermal cracking, cracking, petroleum industry and other directions, can solve the problems of furnace tube matrix damage, easy peeling, cumbersome steps, etc., to reduce catalytic coking and carburizing , The effect of reducing excessive oxidation and prolonging the operating cycle

Active Publication Date: 2014-05-14
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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  • Oxidation-resistant coking-resistant hydrocarbon cracking furnace pipe and preparation method thereof
  • Oxidation-resistant coking-resistant hydrocarbon cracking furnace pipe and preparation method thereof
  • Oxidation-resistant coking-resistant hydrocarbon cracking furnace pipe and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A coupon with the same size and material as that of Comparative Example 1 was used to prepare the coating according to the method provided by the present invention. Put the coupon and 60% elemental molybdenum, 30% elemental silicon, and 10% elemental tungsten in a low vacuum of 0.5Pa and a barrel-shaped cathode filled with argon to infiltrate molybdenum ions, silicon ions, and tungsten ions, the temperature is 900°C, and the temperature is kept for 5 hours, and MoSi with gradient concentration changes is formed on the surface of the coupon. 2 +W's Composite Penetration Layer. The coupon containing the coating was heated to 1200°C at a rate of 20°C / min in the 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 referred to as EDS) was used to analyze the surface element composition of the coupons before and after oxidation, and the results are shown in T...

Embodiment 2

[0029] A coupon with the same size and material as that of Comparative Example 1 was used to prepare the coating according to the method provided by the present invention. Put the coupon and 60% elemental molybdenum, 30% elemental silicon, 5% elemental niobium, and 5% zirconia in a low vacuum of 0.5Pa and filled with argon in a barrel-shaped cathode to infiltrate the molybdenum Ions, silicon ions, niobium ions, zirconium ions, oxygen ions, temperature 800 ℃, heat preservation for 6 hours, formed a gradient concentration of MoSi on the surface of the coupon 2 +Nb+ZrO 2 composite permeable layer. The coupon containing the coating was heated to 1200°C at a rate of 20°C / min in the 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 referred to as EDS) was used to analyze the surface element composition of the coupons before and after oxidation, and the results ...

Embodiment 3

[0045] In this comparative example, the size is The alloy furnace tube made of HK40 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 is placed in the furnace tube, at 900°C and 0.5Pa in a low-vacuum argon atmosphere After 5 hours of medium heat preservation, MoSi with gradient concentration changes was formed on the inner surface of the furnace tube. 2 +W's composite penetration layer.

[0046] Using the pyrolysis conditions and charring conditions of Comparative Example 3, the furnace tube containing the coating of the present invention was subjected to repeated pyrolysis and charring cycle tests, and the coking amounts of different cracking times are 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. At the current level of development, the current method of producing ethylene is mainly tube furnace cracking technology, which has been widely used in the world. [0003] After a period of hydrocarbon steam cracking 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(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
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