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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the technical solution disclosed in the above-mentioned patent, the water vapor content in the adopted atmosphere is low, and the performance of the prepared film is not good.

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
Comparison scheme
Effect test

Embodiment 1

[0028] Cut the superalloy HP40-Nb furnace 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. From the data in Table 1, it can be concluded that there are a large amount of iron and nickel elements on the surface of the superalloy furnace tube, which is the reason for catalytic coking.

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

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

Embodiment 2

[0035] Cut the high-temperature alloy HP40-Nb alloy pipe into test pieces 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 2.

[0036] Put the test piece into a tube furnace, pass through hydrogen gas, containing 1.95% water vapor by volume, and the gas pressure is 1.01 atmospheres. After heating the atmosphere furnace to 1050 degrees Celsius, heat preservation treatment for 40 hours, and take out the test piece after cooling with the furnace.

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

Embodiment 3

[0041] Use superalloy 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. The composition of the test piece was analyzed by X-ray energy dispersive spectrometer (EDS), and the specific results are shown in Table 3.

[0042] Put the test piece into a tube furnace, pass through the mixed gas of hydrogen and argon, wherein the fraction of argon gas is 60%, the mixed gas contains 1.6% water vapor by volume, and the gas pressure is 1.01 atmospheres. After heating the atmosphere furnace to 1000 degrees Celsius, heat preservation treatment for 50 hours, and take out the test piece after cooling with the furnace.

[0043] X-ray photoelectron spectroscopy (XPS) was used to test the composition of the surface (oxidation protection layer) 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 was reduced to a very low level. The energy spectr...

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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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