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Steam cracking method

A technology of steam and cracking furnace, applied in the field of steam cracking, can solve problems such as coking in the convection section, and achieve the effect of avoiding coking, ensuring smooth operation and reducing the possibility of

Active Publication Date: 2016-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The purpose of the present invention is to provide a new steam cracking method in order to overcome the problem that unsaturated hydrocarbons are injected into the cracking furnace as cracking raw materials and coking will occur in the convection section

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0055] This example is used to illustrate the steam cracking method provided by the present invention.

[0056] use figure 1 The convection section of the pyrolysis furnace shown is preheated and the pyrolysis reaction proceeds. The specific process includes:

[0057] The olefins (composition shown in Table 1) of C4, C5 and C6 are vaporized in a vaporization device;

[0058] The mixed gas of the vaporized unsaturated hydrocarbon 1 and the dilution steam 3 is preheated through the raw material preheating section in the convection section of the cracking furnace, and the weight ratio of the amount of the unsaturated hydrocarbon 1 and the dilution steam 3 is It is 1:0.4; After that, the mixed gas of gaseous unsaturated hydrocarbon and dilution steam preheated through the preheating section of the raw material is preheated through the mixing preheating section to obtain the cracking raw material mixture; wherein, the pipe row of the convection section of the cracking furnace is ...

Embodiment 2

[0075] This example is used to illustrate the steam cracking method provided by the present invention.

[0076] The olefins (composition shown in Table 1) of C4, C5 and C6 are vaporized in a vaporization device;

[0077] The mixed gas of the vaporized unsaturated hydrocarbon 1 and the dilution steam 3 is preheated through the raw material preheating section in the convection section of the cracking furnace, and the weight ratio of the amount of the unsaturated hydrocarbon 1 and the dilution steam 3 is It is 1:0.8; After that, the mixed gas of gaseous unsaturated hydrocarbon and dilution steam preheated through the preheating section of the raw material is preheated through the mixing preheating section to obtain the cracking raw material mixture; wherein, the pipe row of the convection section of the cracking furnace is as follows image 3 As shown, the diameter ratio of the connection box between the preheating tube bank and the preheating tube bank outside the convection sec...

Embodiment 3

[0084] This example is used to illustrate the steam cracking method provided by the present invention.

[0085] The olefins (composition shown in Table 1) of C4, C5 and C6 are vaporized in a vaporization device;

[0086] The mixed gas of the vaporized unsaturated hydrocarbon 1 and the dilution steam 3 is preheated through the raw material preheating section in the convection section of the cracking furnace, and the weight ratio of the amount of the unsaturated hydrocarbon 1 and the dilution steam 3 is It is 1:0.5; after that, the mixed gas of gaseous unsaturated hydrocarbon and dilution steam preheated through the preheating section of the raw material is preheated through the mixing preheating section to obtain the cracking raw material mixture; wherein, the pipe row of the convection section of the cracking furnace is as follows image 3 As shown, the diameter ratio of the connection box between the preheating tube row and the preheating tube row outside the convection secti...

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Abstract

The invention discloses a steam cracking method. The method is enforced in a vaporization device and a cracking furnace, the cracking furnace comprises a convection section and a radiation section, the convection section comprises preheating tube rows and a connecting box positioned outside the convection section of the cracking furnace and between the preheating tube rows, and the method comprises the following steps: vaporizing unsaturated hydrocarbons in a vaporization device, mixing the vaporized gaseous unsaturated hydrocarbons with dilution steam, introducing the above obtained cracking raw material mixture to the convection section of the cracking furnace, preheating the cracking raw material mixture, introducing the preheated cracking raw material mixture from the top of the radiation section of the cracking furnace, and carrying out a cracking reaction, wherein a diameter ratio of the preheating rows to the connecting box is 1:5-12, and preferably 1:8-10. The method can reduce the possibility of cracking furnace shutdown induced by convection section coking in order to ensure stable running of the cracking furnace.

Description

technical field [0001] The invention relates to a steam cracking method. Background technique [0002] Low-carbon olefins such as ethylene, propylene and butadiene are important basic raw materials for the petrochemical industry. At present, the method of producing low-carbon olefins is mainly based on the tube furnace petroleum hydrocarbon steam cracking process. According to statistics, about 99% of ethylene, more than 50% of propylene and more than 90% of butadiene in the world are produced through this process. [0003] There are two main sources of raw materials for the production of low-carbon olefins such as ethylene, propylene and butadiene. One is light hydrocarbons by-product of natural gas, such as ethane, propane, butane and natural gasoline, etc.; Products, such as refinery gas, naphtha, diesel, and secondary processing products, such as coking hydrogenated naphtha, hydrogenated tail oil, etc. A common feature of these raw materials is that most of them are sa...

Claims

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Application Information

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IPC IPC(8): C10G9/36
Inventor 张利军王国清周丛杜志国张永刚周先锋张兆斌巴海鹏
Owner CHINA PETROLEUM & CHEM CORP
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