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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 olefin coking and other problems, and achieve the effects of avoiding coking, reducing coking and reducing consumption.

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

[0012] 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
Comparison scheme
Effect test

Embodiment 1

[0061] This example is used to illustrate the steam cracking method provided by the present invention.

[0062] use figure 2 The cleavage apparatus shown performs the cleavage reaction. The specific process includes:

[0063] 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 resulting gas phase mixture flow is preheated through the dilution steam superheating section 13; then the preheated naphtha is mixed with the preheated gas phase mixture flow, and the obtained cracking raw material mixture is heated through the mixing heating section 15, and then Enter the radiant section 9 for cracking reaction; then, inject the obtained cracking reaction product into the quenching heat exchanger 7 for cooling and separation, and separate into high-pressure steam and cracking gas, and the crac...

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 feeding amount of naphtha is 40860kg / h, and in described gas phase mixture flow, the injection amount of steam is 22700kg / h, the feeding amount of mixed C4 olefins is 4540kg / h, the injection rate of hydrogen is 50kg / h, the temperature of the preheated second stream is 540°C, the crossing temperature is 590°C, the outlet temperature (COT) of the radiant section 9 is 830°C, the radiant section The cleavage reaction time in 9 is 0.3 seconds. Other process parameters of the cracking furnace are shown in Table 7, and the composition of the cracking gas is shown in Table 8 through the separation and analysis of the cracked gas.

[0083] Table 7

[0084]

[0085] Table 8

[0086] components

Embodiment 3

[0088] This example is used to illustrate the steam cracking method provided by the present invention.

[0089] Carry out steam cracking according to the method for embodiment 1, difference is, the feeding amount of naphtha is 43130kg / h, and in described gas phase mixture flow, the injection amount of steam is 22700kg / h, the feeding amount of mixed C4 olefins The injection rate of hydrogen is 2270kg / h, the injection rate of hydrogen is 25kg / h, the temperature of the preheated second stream is 520°C, the crossing temperature is 590°C, and the outlet temperature (COT) of the radiant section 9 is 830°C. The cleavage reaction time in 9 is 0.25 seconds. Other process parameters of the cracking furnace are shown in Table 9, and the composition of the cracking gas is shown in Table 10 by separating and analyzing the cracked gas.

[0090] Table 9

[0091]

[0092] Table 10

[0093] components

[0094] As can be seen from the data of Table 3-4, Table 7-8 and Table 9-10,...

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Abstract

The invention discloses a steam cracking method implemented in a cracking furnace, 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 cracking reaction. 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, and the cracking furnace operation can be long-term and stable.

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
Inventor 张勇张永刚王国清杜志国张利军周丛张兆斌
Owner CHINA PETROLEUM & CHEM CORP