Outlet Temperature Correlation and Prediction of Transfer Line Exchanger in an Industrial Steam Ethylene Cracking Process

Predicting the best shutdown time of a steam ethylene cracking furnace in industrial practice remains a challenge due to the complex coking process. As well known, the shutdown time of a furnace is mainly determined by coking condition of the transfer line exchangers （TLE） when naphtha or other heav...

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Bibliographic Details
Published inChinese journal of chemical engineering Vol. 21; no. 4; pp. 388 - 394
Main Author 金阳坤 李进龙 杜文莉 王振雷 钱锋
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.04.2013
Subjects
Coking
Ethylene
Exchange
Furnaces
Mathematical models
outlet temperature
Outlets
parametric model
Shutdowns
steam ethylene cracking
transfer line exchanger
Transfer lines
乙烯裂解炉
出口温度
工业环境
模型预测
温度相关性
蒸汽
裂解工艺
输线器
transfer line exchanger
outlet temperature
parametric model
steam ethylene cracking
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ISSN1004-9541
2210-321X
DOI10.1016/S1004-9541(13)60472-8

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Summary:Predicting the best shutdown time of a steam ethylene cracking furnace in industrial practice remains a challenge due to the complex coking process. As well known, the shutdown time of a furnace is mainly determined by coking condition of the transfer line exchangers （TLE） when naphtha or other heavy hydrocarbon feedstocks are cracked. In practice, it is difficult to measure the coke thickness in TLE through experimental method in the complex industrial situation. However, the outlet temperature of TLE （TLEOT） can indirectly characterize the coking situation in TLE since the coke accumulation in TLE has great influence on TLEOT. Thus, the TLEOT could be a critical factor in deciding when to shut down the furnace to decoke. To predict the TLEOT, a paramewic model was proposed in this work, based on theoretical analysis, mathematic reduction, and parameters estimation. The feasibility of the proposed model was further checked through industrial data and good agreements between model prediction and industrial data with maximum deviation 2% were observed.
Bibliography:transfer line exchanger, outlet temperature, parametric model, steam ethylene cracking
JIN Yangkun , LI Jinlong , DU Wenli , WANG Zhenlei , QIAN Feng （ 1 Key Laboratory of Advanced Control and Optimization for Chemical Processes of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China ;2 Institute of Automation, East China University of Science and Technology, Shanghai 200237, China）
11-3270/TQ
Predicting the best shutdown time of a steam ethylene cracking furnace in industrial practice remains a challenge due to the complex coking process. As well known, the shutdown time of a furnace is mainly determined by coking condition of the transfer line exchangers （TLE） when naphtha or other heavy hydrocarbon feedstocks are cracked. In practice, it is difficult to measure the coke thickness in TLE through experimental method in the complex industrial situation. However, the outlet temperature of TLE （TLEOT） can indirectly characterize the coking situation in TLE since the coke accumulation in TLE has great influence on TLEOT. Thus, the TLEOT could be a critical factor in deciding when to shut down the furnace to decoke. To predict the TLEOT, a paramewic model was proposed in this work, based on theoretical analysis, mathematic reduction, and parameters estimation. The feasibility of the proposed model was further checked through industrial data and good agreements between model prediction and industrial data with maximum deviation 2% were observed.
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ISSN:1004-9541
2210-321X
DOI:10.1016/S1004-9541(13)60472-8