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A single-pass furnace tube cracking furnace system and cracking method

A technology of cracking furnace and cracking furnace tube, which is applied in the direction of cracking, hydrocarbon cracking to hydrocarbon, non-catalytic thermal cracking, etc., and can solve the problem that the operation period of cracking furnace is not long enough

Active Publication Date: 2021-02-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The purpose of the present invention is to provide a single-pass furnace tube cracking furnace system and cracking method in order to overcome the problem that the operating cycle of the existing cracking furnace in the prior art is not long enough

Method used

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  • A single-pass furnace tube cracking furnace system and cracking method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] exist figure 1 Cracking reaction is carried out in the single-pass furnace tube pyrolysis furnace system shown, wherein the tube external diameter of one end of the furnace tube of the single-pass cracking furnace tube 4 used is 54mm, the tube wall thickness is 5mm, the tube external diameter of the other end of the furnace tube is 61mm, and the tube wall The thickness is 6mm, and the total length of the furnace tube is 11800mm. According to the description of the single-pass cracking furnace, the theoretical operation period of the single-pass cracking furnace without switching is 38 days, and the temperature resistance limit of the material of the single-pass cracking furnace is 1115°C.

[0041] The cracking reaction was carried out according to the following conditions: the feed rate was 16 tons / hour, the water-oil ratio was 0.5, the crossover temperature (XOT) was 630° C., and the cracking furnace outlet temperature (COT) was 865° C. The ethylene yield was 30.51 wt...

Embodiment 2

[0044] Carry out according to the method for embodiment 1, and difference is to use different single-pass cracking furnace tubes, and the outer tube diameter of one end of the furnace tube of this single-pass cracking furnace tube 4 is 48mm, and the tube wall thickness is 5mm, and the tube outer diameter of the other end of the furnace tube is The diameter is 52mm, the thickness of the tube wall is 6mm, and the total length of the furnace tube is 11800mm. According to the description of the single-pass cracking furnace, the theoretical operation period of the single-pass cracking furnace without switching is 26 days, and the temperature resistance limit of the material of the single-pass cracking furnace is 1115°C.

[0045] Also switch over at 84% of the theoretical operating cycle (day 21). The final cracking furnace runs for a total of 38 days, which is 146% of the theoretical operation period.

Embodiment 3

[0047] Carry out according to the method for embodiment 1, and difference is to have used different single-pass cracking furnace tubes, and the outer tube diameter of one end of the furnace tube of this single-pass cracking furnace tube 4 is 50mm, and the tube wall thickness 5mm, and the tube outer diameter of the other end of the furnace tube The diameter is 55mm, the thickness of the tube wall is 6mm, and the total length of the furnace tube is 11800mm. According to the record of the instruction manual of the single-pass cracking furnace tube, the theoretical operation period of the single-pass cracking furnace tube is 30 days without switching, and the temperature resistance limit of the material of the single-pass cracking furnace tube is 1115°C.

[0048] Also switch over at 84% of the theoretical operating cycle (day 25). The final cracking furnace runs for a total of 48 days, which is 160% of the theoretical operation period.

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Abstract

The invention relates to the cracking field, in particular to a single-pass furnace tube cracking furnace system and a cracking method. The single-pass furnace tube cracking furnace system includes a single-pass cracking furnace tube (4), a cracking raw material source (1), a first inlet and outlet switching valve (2), a second inlet and outlet switching valve (6) and a cracking product collection device (7); Wherein the inlet of the first inlet and outlet switching valve (2) is connected to the cracking raw material source (1), and the outlet of the first inlet and outlet switching valve (2) is freely switchable with the two ports of the single-pass cracking furnace tube (4) connected respectively; the inlet of the second inlet and outlet switching valve (6) is connected to the two ports of the single-pass cracking furnace tube (4) in a freely switchable manner, and the outlet of the second inlet and outlet switching valve (6) is connected to the pyrolysis product collection The device (7) is connected; the inner diameters of the tubes of the two ports are different, and the difference between the inner diameters of the tubes does not exceed 12 mm. The single-pass furnace tube cracking furnace system and cracking method of the present invention can effectively prolong the operation period of the cracking furnace.

Description

technical field [0001] The invention relates to the cracking field, in particular to a single-pass furnace tube cracking furnace system and a cracking method. 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. [0003] The core equipment of the ethylene plant is the tube cracking furnace, which is composed of a convection section and a radiation section. The pyrolysis raw material and dilution water vapor are first heated in the furnace tube of the convection section, the raw material is gasified and heated to the initial cracking temperature (ie "crossover tempera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G9/20C07C4/04C07C11/04
Inventor 王国清张利军周丛张永刚杜志国张兆斌李蔚刘俊杰申东发
Owner CHINA PETROLEUM & CHEM CORP