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Coking-inhibition hydrocarbon cracking furnace pipe and preparation method thereof

A technology for hydrocarbon cracking furnace tubes and cracking furnace tubes, which is applied in cracking, non-catalytic thermal cracking, ion implantation plating, etc., and can solve problems such as anti-coking, reduced carburization resistance, and inability to use old furnace tubes, etc., to achieve Small thermal stress, inhibition of coking, fine particle effect

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

AI Technical Summary

Problems solved by technology

[0010] However, the manganese-chromium spinel MnCr formed on the inner wall of the cracking furnace tube by using this low oxygen partial pressure method 2 o 4 The protective layer also has the following disadvantages: (1) the technology can only be applied to new furnace tubes, and cannot be used for old furnace tubes; (2) the formed manganese-chromium spinel MnCr 2 o 4 After the protective layer is scorched by air-water vapor, its anti-coking and anti-carburization capabilities decrease significantly, and the life of the coating will not be too long

Method used

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

Examples

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Effect test

Embodiment 1

[0045] A new furnace tube with the same size and material as that of Comparative Example 1 was used, and the furnace tube was coated according to the method of the present invention. Use the new furnace tube as the barrel-shaped cathode, place the manganese material in the furnace tube, and glow discharge for 5 hours in a low-vacuum argon protection atmosphere of 800 ° C and 0.5 Pa. The environmental scanning electron microscope observation is about 0.3mm. The furnace tube containing the manganese permeation layer was first heated in 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 an atmosphere at 1000°C for 10 hours. After cooling, the composition of the inner surface of the furnace tube was analyzed with an X-ray energy dispersive spectrometer (EDS). The results are shown ...

Embodiment 2

[0048]A new furnace tube with the same size and material as that of Comparative Example 1 was used, and the furnace tube was coated according to the method provided by the present invention. Use a new furnace tube as a barrel-shaped cathode, place manganese and aluminum materials in the furnace tube, and glow discharge for 5 hours in a low-vacuum argon protective atmosphere at 800 ° C and 0.5 Pa, and the formed manganese and aluminum permeation layer Observe about 0.4mm with XL-30 field emission environment scanning electron microscope. The furnace tube containing the permeable layer is at 99.97% H on the device described in Comparative Example 1 2 -0.03%H 2 O (the molar ratio of H2 to H2O is 3332:1) atmosphere at 1000 ° C for 20 hours, after cooling, the composition of the inner surface of the furnace tube was analyzed by X-ray energy dispersive spectrometer (Energy Dispersive Spectrometer referred to as EDS). The results are shown in Table 2.

[0049] Using the cracking co...

Embodiment 3

[0054] The furnace tube used is an old furnace tube, which is the furnace tube B that has undergone cracking and charring five times in Comparative Example 1, numbered B', and the furnace tube is coated according to the method provided by the present invention. The furnace tube B' is used as the barrel-shaped cathode, the manganese material is placed in the furnace tube B', and the glow discharge is performed for 5 hours in a low-vacuum argon protection atmosphere of 800 ° C and 0.5 Pa, and the formed manganese element permeation layer is used XL- The scanning electron microscope observation of the 30 field emission environment is about 0.4mm. Contain the furnace tube of permeation layer on the device described in comparative example 1. Contain the furnace tube of manganese permeation layer on the device described in comparative example 1. 2 -0.05%H 2 O(H 2 with H 2 The molar ratio of O is 1999:1) in the atmosphere of 1000 ° C for 20 hours, and then in 50% Ar-49.4% H 2 -0....

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Abstract

The invention provides a coking-inhibition hydrocarbon cracking furnace pipe and a preparation method thereof. The preparation method comprises the following steps that through a cracking furnace pipe as a barrel-shaped cathode, elemental manganese or a mixture of manganese and aluminum is treated according to a glow discharge principle to form manganese ions or a mixture of manganese ions and aluminum ions, the manganese ions or the mixture of manganese ions and aluminum ions fast permeates into an inner surface of the cracking furnace pipe at a high temperature along crystal defects and then form a manganese or manganese-aluminum permeated layer, and in low-oxygen partial pressure gas atmosphere containing H2 and water vapor, a high-temperature treatment process is carried out so that a manganese-chromium spinel or manganese-aluminum spinel coating is formed on the inner surface of the cracking furnace pipe. The manganese-chromium spinel or manganese-aluminum spinel coating can reduce coking and carburization of the cracking furnace pipe and prolong an operation period and a service life of the cracking furnace pipe.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a hydrocarbon cracking furnace tube capable of inhibiting coking 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): C10G9/20C23C14/48C23C14/08C22C38/58C22C38/50C22C38/48C22C38/44
Inventor 王申祥王国清王红霞郏景省
Owner CHINA PETROLEUM & CHEM CORP
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