Steam cracking method

A technology of cracking furnace and vaporization device, which is applied in the field of steam cracking, can solve the problems of coking in the convection section, and achieve the effects of avoiding coking, ensuring smooth operation and reducing the possibility

Inactive Publication Date: 2016-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0031] The purpose of the present invention is to provide a new steam cracking method in order to overcome the problem that unsatu

Method used

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Examples

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Embodiment 1

[0067] This example is used to illustrate the steam cracking method provided by the present invention.

[0068] use figure 1 The convection section of the pyrolysis furnace shown is preheated and the pyrolysis reaction proceeds. The specific process includes:

[0069] The olefins (composition shown in Table 1) of C4, C5 and C6 are vaporized in a vaporization device;

[0070] 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 ...

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Abstract

The present invention discloses a steam cracking method, which is performed in a vaporization apparatus and a cracking furnace, wherein the cracking furnace comprises a convection section and a radiation section, and the convection section comprises pre-heating alignment tubes and a connection box positioned between the pre-heating alignment tubes outside the cracking furnace convection section. The method comprises that unsaturated hydrocarbon is vaporized in the vaporization apparatus to obtain gas-phase unsaturated hydrocarbon, the gas-phase unsaturated hydrocarbon and diluted steam are mixed, pre-heating is performed, one part of the pre-heated mixture is introduced into the outlet position of the cracking furnace radiation section, and the other part is introduced from the middle position of the cracking furnace radiation section and is cracked, wherein a diameter ratio of the pre-heating alignment tubes to the connection box is 1:5-12, and the middle position of the cracking furnace radiation section is positioned at the place having the height of 1/4-4/5 of the height of the cracking furnace. With the method of the present invention, the temperature increasing rate of the cracking raw material in the cracking furnace tube is improved so as to improve the selectivity of the cracking reaction, such that the yields of ethylene, propylene and butadiene are improved.

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): C07C4/04C07C11/04C07C11/06C07C11/16
Inventor 王国清张利军张永刚周丛周先锋巴海鹏张兆斌
Owner CHINA PETROLEUM & CHEM CORP
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