Cracking furnace tube for retarding coking and carburizing of ethylene cracking furnace tube, and manufacturing method thereof

A technology of ethylene cracking furnace and cracking furnace tube, which is applied in the field of cracking furnace tube and its manufacturing, can solve the problems of long preparation time and low water vapor content, improve carburizing resistance, slow down coking and carburizing, prolong cleaning The effect of coke cycle and service life

Active Publication Date: 2012-04-04
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Canadian NOVA Chemical Company disclosed a batch of patents on cracking furnace tubes with a metal oxide protective layer on the inner surface, including US5630887, US 6824883, US 7156979, and US 6436202, which were treated with a mixed gas of hydrogen and water vapor under a low oxygen partial pressure atmosphere. etc., the metal oxide protective layer is mainly chromium-manganese spinel, the water vapor content in the atmosphere treatment is low, and the preparation time is long

Method used

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  • Cracking furnace tube for retarding coking and carburizing of ethylene cracking furnace tube, and manufacturing method thereof
  • Cracking furnace tube for retarding coking and carburizing of ethylene cracking furnace tube, and manufacturing method thereof
  • Cracking furnace tube for retarding coking and carburizing of ethylene cracking furnace tube, and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] In the smelting process of HK-40 nickel-chromium alloy, 1.5% of the total weight of the alloy is added with elemental aluminum, and it is made by centrifugal casting method. 14×2 furnace tube, the inner surface of the furnace tube is bright and free of scale after machining, and the oxygen content is 3.13%. The surface composition of the furnace tube is analyzed by X-ray energy dispersive spectrometer (Energy Dispersive Spectrometer, referred to as EDS), and the results are shown in the table 1.

[0049] use this The 14×2 furnace tube was treated in a low oxygen partial pressure atmosphere on a self-made laboratory device with a feed rate of 200g / h. Use H 2 and H 2 A gas mixture of O is used as a low oxygen partial pressure atmosphere treatment gas, where H 2 O accounts for H 2 and H 2 The volume percentage of the O gas mixture is 2.0%, and the specific treatment conditions are as follows:

[0050] Furnace tube size: 14×2×800

[0051] Oxidation temperature: ...

Embodiment 2

[0072] In the smelting process of HP-40 nickel-chromium alloy, 2.5% of non-metallic elemental silicon is added to the total weight percentage of the furnace tube alloy, and it is made by centrifugal casting method 14×2 furnace tube, after mechanical processing, the inner surface of the furnace tube is bright, no scale, and the oxygen content is 0.16%. The surface composition of the furnace tube is analyzed by X-ray energy dispersive spectrometer (Energy Dispersive Spectrometer, referred to as EDS), and the results are shown in the table 3.

[0073] use this The 14×2 furnace tube was treated in a low oxygen partial pressure atmosphere on a self-made laboratory device with a feed rate of 200g / h. Using CO and H 2 A gas mixture of O is used as a low oxygen partial pressure atmosphere treatment gas, where H 2 O accounts for CO and H 2 The volume percent of the O gas mixture is 8.0%, and the specific treatment conditions are as follows:

[0074] Furnace tube size: 14×2×800 ...

Embodiment 3

[0087] In the smelting process of 35Cr45Ni nickel-chromium alloy (referred to as 3545 nickel-chromium alloy steel), 3.0% of metal elemental aluminum and 1.5% of non-metal elemental silicon are added to the total weight percentage of the furnace tube alloy, and it is made by centrifugal casting method. 14×2 furnace tube, after mechanical processing, the inner surface of the furnace tube is bright, free of scale, and the oxygen content is zero. The surface composition of the furnace tube is analyzed by X-ray energy dispersive spectrometer (Energy Dispersive Spectrometer, referred to as EDS). The results are shown in Table 4 .

[0088] use this The 14×2 furnace tube was treated in a low oxygen partial pressure atmosphere on a self-made laboratory device with a feed rate of 200g / h. Using CO 2 The gas mixture with CO is used as a low oxygen partial pressure atmosphere to treat the gas, and the specific treatment conditions are as follows:

[0089] Furnace tube size: 14×2×800...

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Abstract

The present invention relates to a cracking furnace tube for retarding coking and carburizing of an ethylene cracking furnace tube, and a manufacturing method thereof. According to the present invention, the inner surface of the cracking furnace tube is provided with a layer of an oxide film, wherein the oxide film comprises at least one element selected from Cr, Ni, Fe, Mn, Al, Si and B; the manufacturing method comprises: directly adding at least one element selected from Al, Si or B to a nickel-chromium alloy containing elements of Cr, Ni, Fe, Mn and C during the conventional cracking furnace tube manufacturing process to prepare the tube, then carrying out a heat treatment for the resulting tube under low oxygen partial pressure atmosphere to generate a layer of the metal and/or nonmetal oxide thin film on the inner surface of the tube; when the cracking furnace tube of the present invention is adopted for producing olefin with low carbon number by the petroleum hydrocarbon cracking furnace, the deposition of the coke on the inner wall of the furnace tube can be reduced by more than 70%.

Description

technical field [0001] The invention relates to a cracking furnace tube, more specifically, to a cracking furnace tube which can reduce coke deposition on the inner wall of the furnace tube and its manufacturing method when it is used to crack petroleum hydrocarbons to produce low-carbon olefins. Background technique [0002] Ethylene is a basic raw material for the petrochemical industry. The output, production scale and technology of ethylene indicate the development level of a country's petrochemical industry. At present, the method of producing ethylene is mainly based on tube furnace petroleum hydrocarbon steam cracking technology. According to statistics, about 99% of ethylene and more than 50% of propylene in the world are produced by this method. In the process of producing ethylene and propylene from petroleum hydrocarbon steam cracking in tube furnaces, the coking and carburizing problems of the furnace tubes in the radiant section of the cracking furnace restrict...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G9/20C10G9/16
Inventor 王国清王红霞王申祥崔立山郏景省郑雁军
Owner CHINA PETROLEUM & CHEM CORP
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