Alloy furnace tube as well as treatment method and application thereof

An alloy furnace tube and contact reaction technology, which is applied in the petroleum industry, cracking, non-catalytic thermal cracking, etc., can solve the problems of difficult control and low oxygen partial pressure atmosphere, and achieve compact structure, reduce carburization degree, prolong The effect of service life

Active Publication Date: 2021-12-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the coking and carburizing of the alloy furnace tube for ethylene cracking in the prior art, and the problem that the low oxygen partial pressure atmosphere is difficult to realize and difficult to control during the preparation of the oxide film protective layer in the alloy furnace tube, and to provide a Method for processing alloy furnace tube and alloy furnace tube obtained by processing the method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The HP40 (Cr25Ni35) small test furnace tube is subjected to low oxygen partial pressure pre-oxidation treatment, and the elemental composition of the furnace tube alloy is (wt%): Cr: 25.1, Ni: 35.2, Mn: 1, Si: 1.5, C: 0.4, P<0.03, S<0.03, and the balance is Fe.

[0049] Use H 2 and H 2 The gas mixture of O is used as the treatment gas in a low oxygen partial pressure atmosphere. The dew point of the mixed gas is 10°C, the flow rate of the low oxygen partial pressure gas is 400ml / min, the treatment temperature is 950°C, and the treatment time is 30 hours. An oxide film mainly containing Cr, Mn, Ni, Fe, O, Si and other elements is formed on the surface. The chromium manganese oxide in the oxide film is MnCr 2 o 4 , in the oxide film, the content of iron element and nickel element is 3.76wt% and 4.58wt% respectively.

[0050] The hydrocarbon steam cracking reaction is carried out in the small test furnace tube after the treatment of the low oxygen partial pressure atm...

Embodiment 2

[0052] Carry out low oxygen partial pressure pre-oxidation treatment to the small-scale furnace tube identical with embodiment 1, difference is H 2 and H 2 The dew point of the O mixed gas is 20°C, and other treatment conditions are the same as in Example 1. An oxide film mainly containing Cr, Mn, Ni, Fe, O, Si and other elements is formed on the inner wall surface of the furnace tube. The chromium manganese oxide in the oxide film is MnCr 2 o 4 , in the oxide film, the content of iron element and nickel element is 5.23wt% and 4.87wt% respectively.

[0053] The hydrocarbon steam cracking reaction was carried out in the small test furnace tube after the low oxygen partial pressure atmosphere treatment, and the cracking raw materials and cracking conditions were the same as in Example 1. The coking amount of the furnace tube of the present invention is 87.65% less than the coking amount of the HP40 (Cr25Ni35) furnace tube in the prior art without low oxygen partial pressure t...

Embodiment 3

[0055] Carry out low oxygen partial pressure pre-oxidation treatment to the small-scale furnace tube identical with embodiment 1, difference is H 2 and H 2 The dew point of the O mixed gas is 0°C, and other treatment conditions are the same as in Example 1. An oxide film mainly containing Cr, Mn, Ni, Fe, O, Si and other elements is formed on the inner wall surface of the furnace tube. The chromium manganese oxide in the oxide film is MnCr 2 o 4 , in the oxide film, the content of iron element and nickel element is 6.48wt% and 5.69wt% respectively.

[0056] The hydrocarbon steam cracking reaction was carried out in the small test furnace tube after the low oxygen partial pressure atmosphere treatment, and the cracking raw materials and cracking conditions were the same as in Example 1. The coking amount of the furnace tube of the present invention is 80.65% less than the coking amount of the HP40 (Cr25Ni35) furnace tube without low oxygen partial pressure treatment in the pr...

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PUM

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Abstract

The invention relates to the field of petroleum hydrocarbon thermal cracking, and discloses a method for treating an alloy furnace tube and the alloy furnace tube treated by the method. The method comprises the step of carrying out contact reaction on low oxygen partial pressure gas and an alloy furnace tube, wherein the dew point of the low oxygen partial pressure gas is -40 DEG C to 40 DEG C. The alloy furnace tube is treated by controlling the dew point of the mixed gas to accurately control the low oxygen partial pressure atmosphere, a compact and stable oxidation film is formed on the surface of the alloy furnace tube, the catalytic coking phenomenon is inhibited or slowed down, the carburizing degree of the furnace tube is reduced, and the service life of the furnace tube is prolonged.

Description

technical field [0001] The invention relates to the field of thermal cracking of petroleum hydrocarbons, in particular to a method for processing an alloy furnace tube, an alloy furnace tube obtained by processing the method, and an application of the alloy furnace tube. Background technique [0002] Ethylene is one of the most important basic raw materials in the petrochemical industry. The current method of producing ethylene is mainly tube furnace cracking technology, which has been widely used in the world. However, an unavoidable problem in the production process of ethylene is the coking and carburization of crackers during service. Coking during the cracking process will reduce the inner diameter of the furnace tube, increase the pressure drop inside the tube, and shorten the operating cycle of the cracking furnace; when the temperature of the tube wall reaches the allowable limit or the pressure drop reaches a certain level, the furnace must be shut down for coke cl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G9/20C10G9/16
CPCC10G9/20C10G9/203C10G9/206C10G9/16
Inventor 王红霞王国清王申祥郏景省张利军
Owner CHINA PETROLEUM & CHEM CORP
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