Method for processing high-temperature alloy furnace tube

A high-temperature alloy and furnace tube technology, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of poor film performance and low water vapor content, and prolong the coke cleaning cycle and service life Life, reduce the degree of carburization, slow down the effect of catalytic coking

Active Publication Date: 2009-10-28
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
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Problems solved by technology

In the technical solution disclosed in the above-mentioned patent, the water vapor conten

Method used

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  • Method for processing high-temperature alloy furnace tube
  • Method for processing high-temperature alloy furnace tube
  • Method for processing high-temperature alloy furnace tube

Examples

Experimental program
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Example Embodiment

[0027] Example 1

[0028] The high-temperature alloy HP40-Nb furnace tube was cut into a square test piece with a side length of 10mm and a thickness of 4mm. The material composition of the test piece was analyzed by X-ray energy dispersive spectrometer (EDS), and the results are shown in Table 1. From the data in Table 1, it can be concluded that there are a large amount of iron and nickel on the surface of the superalloy furnace tube, which is the cause of catalytic coking.

[0029] The two test pieces were put into two tube furnaces, and hydrogen gas (containing 0.169% and 0.2% water vapor respectively) was introduced, and the gas pressure was controlled to 1.01 atmospheres. After heating the atmosphere furnace to 900 degrees Celsius, heat preservation treatment for 30 hours, and then take out the test piece after the furnace is cooled.

[0030] X-ray photoelectron spectroscopy (XPS) was used to test the surface composition of the treated test piece, and the energy spectrum (ED...

Example Embodiment

[0034] Example 2

[0035] The high-temperature alloy HP40-Nb alloy tube is cut into test pieces with a side length of 10mm and a thickness of 4mm. The material composition of the test piece was analyzed by X-ray energy dispersive spectrometer (EDS), and the results are shown in Table 2.

[0036] The test piece is put into a tube furnace, and hydrogen gas is introduced, which contains water vapor with a volume fraction of 1.95%, and the gas pressure is 1.01 atm. After the atmosphere furnace was heated to 1050 degrees Celsius, the temperature was kept for 40 hours, and the test piece was taken out after the furnace was cooled.

[0037] X-ray photoelectron spectroscopy (XPS) was used to test the surface composition of the treated test piece, and the energy spectrum (EDS) values ​​of different accelerating voltages were used to calculate the thickness of the oxidation protection layer. The results are shown in Table 2. It is found that the oxidation protection layer is mainly composed...

Example Embodiment

[0040] Example 3

[0041] Use high-temperature alloy HP40-Nb to make a test piece, the size of the test piece is a square with a side length of 10mm and a thickness of 4mm. X-ray energy dispersive spectrometer (EDS) was used to analyze the composition of the test piece, and the specific results are shown in Table 3.

[0042] The test piece was put into a tube furnace, and a mixed gas of hydrogen and argon was introduced, in which the integral number of argon gas was 60%, the mixed gas contained 1.6% water vapor by volume, and the gas pressure was 1.01 atm. After the atmosphere furnace is heated to 1000 degrees Celsius, heat preservation treatment is performed for 50 hours, and the test piece is taken out after the furnace is cooled.

[0043] X-ray photoelectron spectroscopy (XPS) was used to test the surface (oxidation protection layer) composition of the test piece, and it was found that it was mainly composed of manganese, chromium and oxygen, and the content of iron and nickel ...

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Abstract

The invention relates to a method for processing a high-temperature alloy furnace tube, which comprises the following steps: controlling the pressure of low-oxygen partial pressure gas to 0-3 atmospheric pressure; introducing the low-oxygen partial pressure gas into an atmosphere furnace provided with the high-temperature alloy furnace tube; raising the temperature to between 600 and 1,100 DEG C; keeping the temperature for 5 to 80 hours; and forming an oxidized protective layer on the surface of the high-temperature alloy furnace tube to obtain the processed high-temperature alloy furnace tube, wherein the low-oxygen partial pressure gas comprises one or two kinds of H2 and CO, and water vapor accounting for 0.17 to 2 percent of the volume fraction of the low-oxygen partial pressure gas. The method for processing the high-temperature alloy furnace tube is adopted to process a furnace tube of a hydrocarbon cracking furnace and the like, so that the compact and stable oxidized protective layer on the surface of the furnace tube, and the requirement for long-term use can be met; and the method can inhibit or retard the phenomena of catalysis and coking, reduces the carburization degree of the furnace tube, and prolongs the decoking cycle and the service life of the furnace tube.

Description

technical field [0001] The invention relates to a method for treating a high-temperature alloy furnace tube. Specifically, the invention relates to a method for treating a high-temperature alloy furnace tube under a certain atmosphere to form an oxidation protection layer on the surface, which can reduce the coking and carburizing of the furnace tube and prolong the life of the furnace tube. The coke cleaning cycle and service life of the furnace tube. Background technique [0002] Ethylene is an important industrial raw material, mainly derived from the cracking of hydrocarbons. In the hydrocarbon cracking production unit, the mixture of hydrocarbon raw materials and steam is gradually heated to the cracking temperature, and cracked at this temperature to produce ethylene and other olefinic products. During the cracking process of hydrocarbons, an unavoidable phenomenon is that the inner wall of the cracking furnace tube is carburized and a large amount of coke is deposite...

Claims

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Application Information

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IPC IPC(8): C23C8/10
Inventor 崔立山郑雁军熊建新
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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