Steam cracking method

A steam and cracking furnace technology, applied in the field of steam cracking, can solve problems such as olefin coking, and achieve the effects of increasing cracking products, reducing coking and avoiding coking.

Active Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The purpose of the present invention is to provide a new steam cracking method in order to overcome the problem that coking will occur when olefins are injected into the cracking furnace as part of the cracking raw material

Method used

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Examples

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Embodiment 1

[0059] This example is used to illustrate the steam cracking method provided by the present invention.

[0060] use figure 2 The cleavage apparatus shown performs the cleavage reaction. The specific process includes:

[0061] Naphtha 1 at 60°C (relevant parameters are shown in Table 2) is preheated through the raw material preheating section 11; at the same time, the first mixture of mixed C4 olefins 16 (composition is shown in Table 1) and steam 3 A stream is preheated through the dilution steam superheating section 13; then the preheated naphtha is mixed with the preheated first stream, and the obtained cracking raw material mixture is heated through the mixing heating section 15, and then enters Radiation section 9 carries out cracking reaction; at the same time, the second stream which is formed by mixing C4 olefins 16 (composition shown in Table 1) and steam 3 is preheated through dilution steam superheating section 13 to obtain olefin-containing Stream; then, at the ...

Embodiment 2

[0081] This example is used to illustrate the steam cracking method provided by the present invention.

[0082] Carry out steam cracking according to the method for embodiment 1, difference is, the feed intake of naphtha is 40860kg / h, and in the first stream, the injection rate of steam is 22700kg / h, and the feed intake of mixed C4 olefins is 4540kg / h; in the second stream, the injection rate of water vapor is 2270kg / h, and the feed rate of mixed C4 olefins is 1362kg / h; the temperature of the preheated first stream is 530°C, and the preheated The temperature of the second stream was 560°C, the crossover temperature was 596°C, the outlet temperature (COT) of radiant section 9 was 830°C, and the cracking reaction time in radiant section 9 was 0.3 seconds. Other process parameters of the cracking furnace and the quenching heat exchange device 7 are shown in Table 7, and the composition of the cracked gas is shown in Table 8 through separation and analysis of the cracked gas.

[...

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Abstract

The invention discloses a steam cracking method implemented in cracking equipment including a cracking furnace and a rapid-cooling device, the cracking furnace comprises a convection section and a radiation section, and the method comprises the following steps: mixing an olefin and water vapor mixture with a liquid cracking feedstock, heating an obtained cracking feedstock mixture in the convection section for vaporization of the cracking feedstock mixture, heating up to the stretch-across temperature, adding the vaporized cracking feedstock mixture into the radiation section for first cracking reaction to obtain a first cracking reaction product; mixing an olefin-containing material flow with the first cracking reaction product at an outlet port of the radiation section for second cracking reaction to obtain a second cracking reaction product, and then injecting the obtained second cracking reaction product into the rapid-cooling device for cooling and separating. According to the steam cracking method, coking of the olefin as a cracking feedstock in the convection section of the cracking furnace can be reduced, then cracking furnace operation can be long-term and stable, and the heat from high temperature cracking products of the radiation section can be effectively recovered.

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] The production plant established with the core technology of the tube cracking furnace steam cracking process and its downstream cryogenic separation process is called an ethylene plant. The core equipment of the device is a tube cracking furnace, which is composed of a convection section and a radiation section. The pyrolysis raw material and dilution water vapor are firstly heated in the convection section furnace tube respectively, the two are mixe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G9/36C07C4/04C07C11/02
CPCC10G9/36
Inventor 王国清张利军张永刚刘俊杰杜志国周先锋
Owner CHINA PETROLEUM & CHEM CORP
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