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 reduced anti-coking carburizing ability, low bonding force, peeling, etc., to reduce the degree of carburization , Strong binding force, prolonging the coke cleaning cycle and the effect of service life

Active Publication Date: 2009-10-28
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the technical solution disclosed in this patent, the atmosphere treatment needs to be carried out first, and then the alloy powder is coated, and a protective layer is formed after alloying treatment. The thickness of the protective layer can reach more than 100 microns, although the prepared protective layer contains iron

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Cut the superalloy HP40-Nb alloy tube into a square test piece with a side length of 10 mm and a thickness of 4 mm. The material composition of the test piece was analyzed by X-ray energy dispersive spectrometer (EDS), and the results are shown in Table 1.

[0033] Put the test piece into the tube furnace, and pass the hydrogen gas with the pressure of 1.01 atmosphere through the ammonia water with the concentration of 0.5% at 25°C, and then pass it into the tube furnace, heat it to 1000°C, and heat it for 30 hours. After cooling, take out the test piece.

[0034]Test the surface composition of the test piece with X-ray photoelectron spectroscopy (XPS) (the results are shown in Table 1), and find that it is mainly composed of elements such as manganese, chromium, oxygen, iron and nickel, and wherein the iron and nickel content has decreased relative to before treatment a lot of.

[0035] Surface composition of the test piece before and after treatment in Table 1 Examp...

Embodiment 2

[0038] A high-temperature alloy HP40-Nb alloy tube is used to make a test piece, which is a square 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.

[0039] Put the test piece into the tube furnace, and pass the hydrogen gas with the pressure of 1.01 atmosphere through the ammonia water with the concentration of 38% at 4°C and pass it into the tube furnace, heat it to 900°C, heat it for 40 hours, and cool it with the furnace Then remove the test piece.

[0040] The surface composition of the test piece was tested by X-ray photoelectron spectroscopy (XPS) (results are shown in Table 2), and it was found that it was mainly composed of manganese, chromium and oxygen, and the content of iron and nickel was reduced to a very low level.

[0041] Surface composition of the test piece before and after treatment in the embodiment 2 of table 2 (...

Embodiment 3

[0044] A high-temperature alloy HP40-Nb alloy tube is used to make a test piece, which is a square with a side length of 10mm and a thickness of 4mm. The composition of the test piece was analyzed by X-ray energy dispersive spectrometer (EDS), and the results are shown in Table 3.

[0045] Put the test piece into the tube furnace, and pass the mixed gas of hydrogen and argon with the pressure of 1.01 atmosphere through the ammonia water with a concentration of 10% at 15°C and pass it into the tube furnace, wherein the hydrogen-argon gas mixture The volume fraction of argon in the medium is 60%. After heating to 900 degrees Celsius, heat preservation treatment for 40 hours, and take out the test piece after cooling with the furnace.

[0046] The surface composition of the test piece was tested by X-ray photoelectron spectroscopy (XPS) (results are shown in Table 3), and it was found that it was mainly composed of manganese, chromium and oxygen, and the content of iron and nicke...

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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 after passing through ammonia water; 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. 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, more specifically, the invention relates to a method for treating a high-temperature alloy furnace tube under a certain atmosphere to form an oxide layer on the surface, reduce coking and carburizing of the furnace tube, and extend the furnace The method of cleaning the coke cycle and service life of the 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 deposited. When coke accumulates to a certa...

Claims

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Application Information

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