Improvement potential analysis for integrated fractionating and heat exchange processes in delayed coking units

doi:10.1016/j.cjche.2016.04.038

›› 2016, Vol. 24 ›› Issue (8): 1047-1055.DOI: 10.1016/j.cjche.2016.04.038

• Process Systems Engineering and Process Safety • 上一篇下一篇

Improvement potential analysis for integrated fractionating and heat exchange processes in delayed coking units

Yang Lei, Danlin Zeng, Guanghui Wang

School of Chemical Engineering and Technology, Wuhan University of Science and Technology, Wuhan 430081, China

收稿日期:2015-05-09 修回日期:2015-10-04 出版日期:2016-08-28 发布日期:2016-09-21
通讯作者: Guanghui Wang
基金资助:
Supported by the National Natural Science Foundation of China (21473126), the Specialized Research Fund for the Doctoral Program of Higher Education (20124219110002), and China Postdoctoral Science Foundation (2015M582285).

Improvement potential analysis for integrated fractionating and heat exchange processes in delayed coking units

Yang Lei, Danlin Zeng, Guanghui Wang

School of Chemical Engineering and Technology, Wuhan University of Science and Technology, Wuhan 430081, China

Received:2015-05-09 Revised:2015-10-04 Online:2016-08-28 Published:2016-09-21
Supported by:
Supported by the National Natural Science Foundation of China (21473126), the Specialized Research Fund for the Doctoral Program of Higher Education (20124219110002), and China Postdoctoral Science Foundation (2015M582285).

摘要/Abstract

摘要： A novel diagram-based representation approach is developed to analyze the thermodynamic efficiency and identify quickly the promising energy-use improvement for integrated fractionating and heat exchange processes in delayed coking units. For considering temperature dependence of heat capacity and integrating fractionating and heat exchange processes, an advanced energy level composite curve is constructed by using the simulation results and a stepwise procedure. More accurate results of exergy analysis are obtained and the interaction between different components of the integrated system can be properly revealed in an integrated figure. Then the exergy calculation is performed to validate the performance of processes and to define the targets for improvement. The avoidable exergy destruction is also analyzed by applying the concepts of avoidable and unavoidable exergy destructions for the integrated system. In a case study for a Chinese refinery, the results reveal that the heat exchange between gas oil and deethanization gasoline is the most inefficient process with the highest retrofitting potential, and the lowest exergy efficiency of component in the integration system is only 29.4%. The improvement potential and exergy efficiency for the fractionator are 38.1% and 97.3%, respectively. It is obvious that the fractionator is not the most promising component for improvement.

关键词: Energy level, Exergy, Avoidable exergy destruction, Integrated system, Distillation

Abstract: A novel diagram-based representation approach is developed to analyze the thermodynamic efficiency and identify quickly the promising energy-use improvement for integrated fractionating and heat exchange processes in delayed coking units. For considering temperature dependence of heat capacity and integrating fractionating and heat exchange processes, an advanced energy level composite curve is constructed by using the simulation results and a stepwise procedure. More accurate results of exergy analysis are obtained and the interaction between different components of the integrated system can be properly revealed in an integrated figure. Then the exergy calculation is performed to validate the performance of processes and to define the targets for improvement. The avoidable exergy destruction is also analyzed by applying the concepts of avoidable and unavoidable exergy destructions for the integrated system. In a case study for a Chinese refinery, the results reveal that the heat exchange between gas oil and deethanization gasoline is the most inefficient process with the highest retrofitting potential, and the lowest exergy efficiency of component in the integration system is only 29.4%. The improvement potential and exergy efficiency for the fractionator are 38.1% and 97.3%, respectively. It is obvious that the fractionator is not the most promising component for improvement.

Key words: Energy level, Exergy, Avoidable exergy destruction, Integrated system, Distillation

Yang Lei, Danlin Zeng, Guanghui Wang. Improvement potential analysis for integrated fractionating and heat exchange processes in delayed coking units[J]. , 2016, 24(8): 1047-1055.

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Improvement potential analysis for integrated fractionating and heat exchange processes in delayed coking units

Improvement potential analysis for integrated fractionating and heat exchange processes in delayed coking units

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