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Coking-resistant hydrocarbon cracking furnace pipe and preparation method thereof

A technology of hydrocarbon cracking furnace tube and cracking furnace tube, which is applied in the field of hydrocarbon cracking furnace tube and its preparation, can solve the problems of reducing the stability of manganese-chromium spinel, and weakening the ability of anti-coking and anti-carburization, etc., to achieve The effect of small particles, good stability and strong binding force

Active Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Manganese-chromium spinel MnCr obtained on the inner surface of the furnace tube by low oxygen partial pressure oxidation 2 o 4 The protective layer, its anti-coking and anti-carburization ability will gradually weaken with the increase of the service time of the furnace tube. One of the important reasons is that the Cr in the furnace tube matrix is ​​a large amount, more than 20%, and the Mn is a trace amount. , only about 1%, so the MnCr formed by oxidation 2 o 4 The protective layer contains a large amount of Cr 2 o 3 , it will reduce the manganese chromium spinel MnCr 2 o 4 stability

Method used

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  • Coking-resistant hydrocarbon cracking furnace pipe and preparation method thereof
  • Coking-resistant hydrocarbon cracking furnace pipe and preparation method thereof
  • Coking-resistant hydrocarbon cracking furnace pipe and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A new furnace tube with the same size and material as that of Comparative Example 1 was adopted, and the coating was prepared according to the method of the present invention for the furnace tube. The furnace tube is first heated at 99.97%H on the device described in Comparative Example 1 2 -0.03%H 2 O(H 2 with H 2 The molar ratio of O is 3332:1) in an atmosphere of 1000°C for 20 hours, and then in 50%Ar-49.7%H 2 -0.3%H 2 O(H 2 with H 2 The molar ratio of O is 166:1) in the atmosphere at 1000°C for 10 hours. After cooling, the composition of the inner surface of the furnace tube was analyzed by X-ray energy dispersive spectrometer (EDS). The results are shown in Table 2.

[0039] Using the cracking conditions of Comparative Example 1, the furnace tube was subjected to 5 cycles of cracking and charring tests, and the coking amounts of different cracking times are shown in Table 3.

[0040] Table 2

[0041]

[0042] table 3

[0043]

[0044] From Table 2, w...

Embodiment 2

[0051] The material of the furnace tube in Example 1 was changed to HP40, and other conditions remained unchanged.

[0052] Table 4

[0053]

[0054] table 5

[0055]

[0056] From Table 4, we can find that the content of Cr and Mn elements on the surface of the furnace tube of Example 2 increases, while the elements of Fe and Ni with catalytic coking activity are greatly reduced. Compared with Comparative Example 2 (US6436202), the Cr content is low and Mn The content is high, which makes it easier for manganese-chromium spinel to maintain its spinel structure, and the stability is better.

[0057] From Table 5, we can find that the amount of coking in the 5th pyrolysis in Comparative Example 3 (blank value) is about 1.5 grams; the amount of coking in the first time in Comparative Example 4 (US6436202) is very low, which is reduced by more than 90% compared with the blank value , but with the increase of cracking and burning times, the amount of coking gradually incre...

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Abstract

The invention provides a coking-resistant hydrocarbon cracking furnace pipe and a preparation method thereof. A cracking furnace pipe is subjected to two-stage high-temperature heat treatment in a H2- and vapor-containing low-oxygen partial pressure gas atmosphere so that a manganese-chromium spinel coating is formed on the inner surface. In the first-stage high-temperature heat treatment, a mole ratio of H2 to vapor is in a range of 1792-107 and in the second-stage high-temperature heat treatment, a mole ratio of H2 to vapor is in a range of 1-1791. The manganese-chromium spinel has a structural formula of MnxCr3-xO4 and x is in a range of 0.5-1.5. The manganese-chromium spinel coating reduces deposition of coke on the inner wall of a radiation-section furnace pipe in hydrocarbon cracking and prolongs an operation period and a use life of the furnace pipe.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a hydrocarbon cracking furnace tube with anti-coking performance and a preparation method thereof. Background technique [0002] Trienes (ethylene, propylene, butadiene) and triphenyls (benzene, toluene, xylene) produced by ethylene plants are the basic raw materials for the petrochemical industry. The output, production scale and technology of ethylene indicate the development level of a country's petrochemical industry. The current method of producing ethylene is mainly tube furnace cracking technology, which has been widely used in the world. [0003] Coking of the furnace tube in the radiant section of the cracking furnace of the tube furnace is a major technical problem that has plagued ethylene production for a long time. Coking will increase the thermal resistance of the furnace tube and reduce the heat transfer coefficient, resulting in an increase in wall temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G9/20C10G9/16
Inventor 王申祥王国清王红霞郏景省
Owner CHINA PETROLEUM & CHEM CORP
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