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Steam cracking method

A technology of steam and cracking furnace, applied in the field of steam cracking, which can solve problems such as olefin coking, and achieve the effect of increasing butadiene yield and high butadiene yield

Active Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • 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

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Examples

Experimental program
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Effect test

Embodiment 1

[0085] This example is used to illustrate the steam cracking method provided by the present invention.

[0086] Using a convection section such as figure 2 The cracking furnace shown carries out the cracking reaction. The specific process includes:

[0087] Add mixed C4 olefins 16 (the composition is shown in Table 2) into the evaporator for vaporization to obtain mixed C4 olefins at a temperature of 180°C, and then mix the mixed C4 olefins with hydrogen 18 and water vapor 3 to obtain an olefin-containing stream .

[0088] Naphtha 1 at 60°C (relevant parameters are shown in Table 1) is preheated through raw material preheating section 11; at the same time, water vapor 3 is preheated through dilution steam superheating section 13; then the preheated naphtha The oil is mixed with preheated steam, and the resulting cracking feedstock mixture is heated to crossover temperature through the mixing heating section 15, then mixed with the first olefin-containing stream, and the re...

Embodiment 2

[0107] This example is used to illustrate the steam cracking method provided by the present invention.

[0108] Carry out steam cracking according to the method for embodiment 1, difference is, do not add described olefin-containing stream at the inlet of described radiant section 9, wherein, the feeding amount of naphtha is 45400kg / h, in convection section 10 The injection rate of the injected steam is 27200kg / h, and in the stream containing olefins added at the outlet of the radiant section 9, the injection rate of the mixed C4 olefins is 2270 kg / h, and the injection rate of hydrogen is 25 kg / h , the injection rate of steam is 2270kg / h, the crossover temperature (XOT) is 590°C, the outlet temperature (COT) of the radiant section of the cracking furnace is 830°C, and the cracking reaction time in the radiant section 9 is 0.3 seconds. Other process parameters of the convection section 10 and the quenching heat exchange device 7 are shown in Table 7, and the composition of the ...

Embodiment 3

[0114] This example is used to illustrate the steam cracking method provided by the present invention.

[0115] Carry out steam cracking according to the method for embodiment 1, difference is, do not add described olefin-containing stream at the outlet of described radiant section 9, wherein, the feeding amount of naphtha is 43130kg / h, in convection section 10 The injection rate of the injected steam is 22700kg / h, and in the stream containing olefins added at the outlet of the radiant section 9, the injection rate of the mixed C4 olefins is 2270kg / h, and the injection rate of hydrogen is 25kg / h , the injection rate of water vapor is 1362kg / h, the crossover temperature (XOT) is 590°C, the outlet temperature (COT) of the radiant section of the cracking furnace is 830°C, and the cracking reaction time in the radiant section 9 is 0.25 seconds. Other process parameters of the convection section 10 and the quenching heat exchange device 7 are shown in Table 10, and the composition ...

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Abstract

A steam cracking method comprises the following steps: mixing a liquid cracking raw material with water steam, heating the above obtained cracking raw material mixture in a convection section to an across temperature, adding the heated cracking raw material mixture into a radiant section, carrying out a cracking reaction, injecting the above obtained cracking reaction product into a quenching apparatus, and cooling and separating, wherein the method also comprises a step that a material flow containing olefin is added at the inlet and / or outlet of the radiant section, and the material flow containing olefin is a mixture containing heated olefin and hydrogen, or a mixture containing the heated olefin, hydrogen and the water steam. The method allows olefin to be introduced at the outlet and / or inlet of the radiant section, so coking generated in the convection section of a cracking furnace and in the quenching apparatus does not appear, the effective utilization of heat of high temperature cracking products from the radiant section can be realized, and the butadiene yield is 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 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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IPC IPC(8): C10G9/36C07C4/04C07C11/02
Inventor 张利军王国清张永刚杜志国李蔚周丛周先锋
Owner CHINA PETROLEUM & CHEM CORP
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