A 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: 2016-02-24
CHINA PETROLEUM & CHEM CORP +1
View PDF11 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A steam cracking method
  • A steam cracking method
  • A steam cracking method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] This example is used to illustrate the steam cracking method provided by the present invention.

[0063] use figure 2 The cleavage apparatus shown performs the cleavage reaction. The specific process includes:

[0064] 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 mixed C4 olefins 16 (composition is shown in Table 1), hydrogen 18 and steam 3 are mixed to form The formed first 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 enter the radiant section 9 to carry out the cracking reaction; at the same time, the second stream (that is, the stream containing olefins) formed by mixing C4 olefins 16 (the composition is shown in Table 1), hydrogen 18 and water vapor 3 Preheating thro...

Embodiment 2

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

[0085] Carry out steam cracking according to the method for embodiment 1, difference is, the feed intake of naphtha is 45400kg / h, and in the first stream, the injection rate of steam is 22700kg / h, and the feed intake of mixed C4 olefins is 1362kg / h, the injection rate of hydrogen is 15kg / h; in the second stream, the injection rate of water vapor is 2270kg / h, the feed rate of mixed C4 olefins is 2270kg / h, and the injection rate of hydrogen is 25kg / h, The temperature of the preheated second stream is 540°C, the temperature of the preheated second stream is 560°C, the crossing temperature is 590°C, the outlet temperature (COT) of the radiant section 9 is 830°C, and the radiant section The cleavage reaction time in 9 is 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...

Embodiment 3

[0091] This example is used to illustrate the steam cracking method provided by the present invention.

[0092] Steam cracking is carried out according to the method of Example 1, the difference is that no steam 3 and hydrogen 18 are injected into the second stream (that is, the stream is composed of the mixed C4 olefins), and the second stream is passed through The convection section 10 is preheated to 200° C. and injected into the outlet of the radiant section 9 . Other process parameters of the cracking furnace and the quenching heat exchange device 7 are shown in Table 9, and the composition of the cracked gas is shown in Table 10 through separation and analysis of the cracked gas.

[0093] Table 9

[0094]

[0095] Table 10

[0096] components

[0097]By comparing Table 3 with Table 9 and Table 4 with Table 10, it can be seen that according to the method provided by the present invention, by injecting a mixture of olefins, hydrogen and water vapor as an ole...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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, the method comprises the following steps: mixing an olefin, hydrogen 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 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, the 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C07C4/04C07C11/02C07C11/167C10G9/36
Inventor 王国清张利军杜志国张永刚周先锋张兆斌
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap