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A Takeover Combination Structure

A combined structure and casing technology, applied in the direction of pipe/pipe joint/fitting, sleeve/socket connection, petroleum industry, etc., can solve problems such as easy cracking, achieve the effect of reducing coking, reducing residence time, and tight connection

Active Publication Date: 2017-02-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcoming of the existing metal pipe and ceramic pipe connection structure that is easy to crack under high temperature working environment, and develop a metal pipe and ceramic pipe joint combination structure that can be used under high temperature working environment

Method used

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  • A Takeover Combination Structure
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  • A Takeover Combination Structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment is used to illustrate in the combined structure of ceramic tube and metal pipe joint on the simulated cracking furnace in the laboratory, cracking performance and process parameters of a kind of ceramic cracking furnace tube, the results are as shown in table 2, and the structure is as follows figure 1 shown.

[0037] Put the zirconia cracking furnace tube with the size of Φ14×2×900mm into the laboratory-scale hydrocarbon cracking furnace, and the metal joint between the ceramic cracking furnace tube and the inlet figure 1 Connect as shown. The specific structure is as follows:

[0038] The combined structure of the metal pipe 1 and the ceramic pipe 6 includes the metal pipe 1, the ceramic pipe 6 and the bushing assembly, and is characterized in that:

[0039] The casing assembly includes a sleeve 2, a ceramic fiber gasket 3, a gasket 4 and a sleeve fastening fitting 5;

[0040] One end of the metal pipe 1 is inserted into the sleeve 2;

[0041] One ...

Embodiment 2

[0052] This embodiment is used to illustrate the cracking performance and process parameters of another ceramic cracking furnace tube in the combined structure of ceramic tube and metal pipe joint on the simulated cracking furnace in the laboratory. The results are shown in Table 2.

[0053] Put an alumina cracking furnace tube with a size of Φ14×2×450mm into a laboratory-scale hydrocarbon cracking furnace. The cracking furnace tube is a double-pass straight tube with a total length of 900mm. The ceramic cracking furnace tube and the inlet The metal joints are taken figure 1 Connect as shown. The specific structure is the same as that of Embodiment 1, except that the ceramic tube 6 is a two-way straight tube made of alumina material.

[0054] Use a piston pump to input deionized water into the vaporizer at a certain flow rate, heat the cracking furnace to the cracking temperature, and heat the vaporizer to 600°C at the same time. When the temperature of the cracking furnace...

Embodiment 3

[0057] This embodiment is used to illustrate the cracking performance and operation of the ceramic cracking furnace tube in the combined structure of the ceramic tube and the metal pipe joint on the industrial cracking furnace. The results are shown in Table 2.

[0058] A straight silicon carbide tube with a length of 4m and an inner diameter of 28mm is used as the radiant section of a 20,000-ton ethylene / year cracking furnace, and the metal joint of the ceramic cracking furnace tube and the inlet is taken figure 2 (General laboratory scale pressure is small, figure 1 The connection method can meet the requirements, figure 2 Due to the presence of protective gas, the connection method can more effectively prevent gas leakage, so figure 1 with figure 2 is set for the raw material scale) to connect in the manner shown. The specific structure is as follows:

[0059] A joint combination structure of ceramic tube 6 and metal tube 1 is usually used in industrial cracking fu...

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Abstract

The invention discloses a connecting pipe combination structure. The connecting pipe combination structure comprises a metal pipe (1), a ceramic pipe (6) and a bushing component, wherein the bushing component comprises a sleeve (2), a ceramic fiber sealing pad (3), a gasket (4) and a sleeve fastening fitting (5), wherein one end of the metal pipe (1) is inserted in the sleeve (2); the ceramic fiber sealing pad (3) and the gasket (4) cover the outer wall of one end of the ceramic pipe (6); the ceramic pipe (6) covered with the ceramic fiber sealing pad (3) and the gasket (4) is inserted in the sleeve (2) to enable the ceramic pipe (6) to be in butt joint with the sleeve (2); and the sleeve fastening fitting (5) covers the outer wall of the ceramic pipe (6) and one side of the sleeve (2) for sealing and reinforcing the sleeve (2). The connecting pipe combination structure can adapt to a high-temperature working environment, reduces the coking in the cracking process, and prolongs the operation period of a cracking furnace.

Description

technical field [0001] The invention relates to a combination structure of a metal tube and a ceramic tube, which can adapt to high-temperature working environments, such as steam cracking, thermal cracking, catalytic dehydrogenation, steam reforming, etc. with strong thermal effects. Applied in endothermic reactions at 600°C-1200°C. Background technique [0002] Ethylene is one of the most important basic raw materials in the petrochemical industry. At present, an unavoidable problem in the ethylene production process is the coking and carburization of crackers during service. Taking the ethylene cracking furnace tube as an example, coking makes the inner diameter of the furnace tube smaller and the pressure drop inside the tube increases, which increases the temperature of the furnace tube wall in some areas and shortens the operating cycle of the cracking furnace; when the tube wall temperature reaches the allowable limit or the pressure drop reaches At a certain level,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L21/00
CPCC10G9/20C10G9/203
Inventor 王国清郏景省王红霞王申祥周丛黄政仁刘学建闫永杰
Owner CHINA PETROLEUM & CHEM CORP
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