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Steam cracking method

A steam and cracking furnace technology, applied in the field of steam cracking, can solve the problems of coking in the convection section

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

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Problems solved by technology

[0020] 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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Embodiment 1

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

[0056] use figure 2 The cleavage apparatus shown performs the cleavage reaction. The specific process includes:

[0057] C4, C5 and C6 olefins (composition as shown in Table 1) are vaporized in a vaporization device; the dilution steam 3 is preheated through the raw material preheating section 11 in the convection section of the cracking furnace, and the unsaturated hydrocarbon The weight ratio of 1 and the amount of the dilution steam 3 is 1:0.4; then the vaporized gas phase unsaturated hydrocarbon is mixed with the gas of the dilution steam preheated by the raw material preheating section 11 to obtain a cracking raw material mixture; Then the cracking raw material mixture is introduced from the middle part of the radiant section 9 of the cracking furnace and carried out cracking reaction, wherein, the temperature at which the diluted steam is preheated in the convectio...

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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, and the method comprises the following steps: vaporizing unsaturated hydrocarbons in the vaporization device, preheating dilution steam in the convection section of the cracking furnace, mixing the vaporized gaseous unsaturated hydrocarbons with preheated dilution steam, introducing the above obtained cracking raw material mixture from the middle position of the radiation section of the cracking furnace, and carrying out a cracking reaction, wherein the middle position of the radiation section of the cracking furnace is the 1 / 4-4 / 5 position of the height of the cracking furnace. The method reduces the temperature of the unsaturated hydrocarbons in a convection section preheating tube row in order to reduce the coking rate of the unsaturated hydrocarbons in the convection section preheating tube row, so coking of a cracking raw material in the convection section preheating process is alleviated or avoided, thereby the possibility of cracking furnace shutdown induced by convection section coking is reduced 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 for 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 ...

Claims

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Application Information

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IPC IPC(8): C07C4/04C07C11/04C07C11/06C07C11/16
Inventor 张利军王国清张兆斌杜志国周丛张永刚巴海鹏周先锋
Owner CHINA PETROLEUM & CHEM CORP
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