Anti-coking anti-carburizing cracking furnace tube and manufacturing method thereof

A technology of cracking furnace tube and manufacturing method, applied in cracking, non-catalytic thermal cracking, petroleum industry and other directions, can solve the problems of high cost, many steps, complicated coating preparation process, etc., and achieve the effect of reducing deposition and achieving remarkable effect

Active Publication Date: 2012-04-04
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the coating preparation process is complicated, there are many steps, and the cost is high.

Method used

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  • Anti-coking anti-carburizing cracking furnace tube and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In the smelting process of HK-40 nickel-chromium alloy, 1.0% of rare earth metal elemental lanthanum is added to the total weight of the alloy, and it is made by centrifugal casting method After machining, the inner surface of the furnace tube is bright and free of scale, and the oxygen content is 3.09%. The surface composition of the furnace tube is analyzed by X-ray energy dispersive spectrometer (Energy Dispersive Spectrometer, referred to as EDS). The results are shown in Table 1.

[0050] use this The furnace tube was treated in a low oxygen partial pressure atmosphere on a self-made laboratory device with a feed rate of 200g / h. Use H 2 and H 2 A gas mixture of O is used as a low oxygen partial pressure atmosphere treatment gas, where H 2 O accounts for H 2 and H 2 The volume percentage of the O gas mixture is 2.0%, and the specific treatment conditions are as follows:

[0051] Furnace tube size:

[0052] Oxidation temperature: 900°C

[0053] Oxidation ...

Embodiment 2

[0072] In the smelting process of HP-40 nickel-chromium alloy, 0.5% of rare earth metal elemental yttrium is added to the total weight percentage of the alloy, and it is made by centrifugal casting method After machining, the inner surface of the furnace tube is bright, free of scale, and the oxygen content is 0.15%. The surface composition of the furnace tube is analyzed by X-ray energy dispersive spectrometer (Energy Dispersive Spectrometer, referred to as EDS). The results are shown in Table 3.

[0073] use this The furnace tube was treated in a low oxygen partial pressure atmosphere on a self-made laboratory device with a feed rate of 200g / h. Using CO and H 2 A gas mixture of O is used as a low oxygen partial pressure atmosphere treatment gas, where H 2 O accounts for CO and H 2 The volume percent of the O gas mixture is 8.0%, and the specific treatment conditions are as follows:

[0074] Furnace tube size:

[0075] Oxidation temperature: 950°C

[0076] Oxidation...

Embodiment 3

[0087] In the smelting process of 35Cr45Ni nickel-chromium alloy (referred to as 3545 nickel-chromium alloy steel), 0.8% of rare earth metal elemental yttrium and 0.5% of rare earth metal elemental lanthanum are added to the total weight percentage of the alloy, and it is made by centrifugal casting method After mechanical processing, the inner surface of the furnace tube is bright, free of scale, and the oxygen content is zero. The surface composition of the furnace tube is analyzed by X-ray energy dispersive spectrometer (Energy Dispersive Spectrometer, referred to as EDS). The results are shown in Table 4.

[0088] use this The furnace tube was treated in a low oxygen partial pressure atmosphere on a self-made laboratory device with a feed rate of 200g / h. Using CO 2 The gas mixture with CO is used as a low oxygen partial pressure atmosphere to treat the gas, and the specific treatment conditions are as follows:

[0089] Furnace tube size:

[0090] Oxidation temperature...

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Abstract

The invention relates to an anti-coking anti-carburizing cracking furnace tube and a manufacturing method thereof. The inner surface of the cracking furnace tube of the invention has a layer which comprises an oxide membrane which comprises at least one of Cr, Ni, Fe, Mn, La, Ce and Y. The manufacturing method comprises the following steps: Ni-Cr alloy containing elements of Cr, Ni, Fe, Mn and C is directly added to at least one element selected from La, Ce or Y in a routine cracking furnace tube manufacturing process to prepare a tube; and the tube is subjected to heat treatment in low oxygen partial pressure atmosphere to generate a layer of the metal oxide membrane on the inner surface. The coke deposition on the inner surface of the radiant section furnace tube can be reduced by more than 60% when the cracking furnace tube of the invention is used in a petroleum hydrocarbon cracking furnace to produce low carbon number olefins.

Description

technical field [0001] The invention relates to a cracking furnace tube, and more specifically, to a cracking furnace tube and a manufacturing method thereof which are anti-coking and anti-carburizing when used for cracking petroleum hydrocarbons to produce low-carbon olefins. Background technique [0002] Ethylene is a basic raw material for the petrochemical industry. The output, production scale and technology of ethylene indicate the development level of a country's petrochemical industry. At present, the method of producing ethylene is mainly based on tube furnace petroleum hydrocarbon steam cracking technology. According to statistics, about 99% of ethylene and more than 50% of propylene in the world are produced by this method. In the process of producing ethylene and propylene from petroleum hydrocarbon steam cracking in tube furnaces, the coking and carburizing problems of the furnace tubes in the radiant section of the cracking furnace restrict the operating cycle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G9/20C10G9/16
Inventor 王国清王红霞崔立山王申祥郏景省郑雁军
Owner CHINA PETROLEUM & CHEM CORP
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