https://scholars.lib.ntu.edu.tw/handle/123456789/409648
標題: | Retrofit of steam power plants in a petroleum refinery | 作者: | Chen C.-L. Lin C.-Y. Lee J.-Y. |
關鍵字: | MINLP;Optimization;Retrofit;Steam system;Total site integration | 公開日期: | 2013 | 卷: | 61 | 期: | 1 | 起(迄)頁: | 7-16 | 來源出版物: | Applied Thermal Engineering | 摘要: | A comprehensive mathematical model is developed for the operational optimization and retrofit of industrial steam systems. The problem of maximizing the cost reduction given by the difference in annual operating costs minus the annualized investment cost of the retrofit is formulated as a mixed integer nonlinear program (MINLP) based on a collection of unit models. The steam power plant of a traditional petroleum refinery is analyzed and retrofitted based on the proposed MINLP formulation. The operating conditions are firstly optimized to investigate whether there is room for improvement without modifying existent units or layout. Thereafter, retrofit possibilities on internal steam turbine or layout are taken into account to enhance steam utilization efficiency. Feasible method for inspiring the total site steam integration among adjacent companies is finally deliberated, where the steam ejector is adopted to upgrade the lower pressure import steam for being directed into the existent steam headers. The results of various degrees of retrofit on the steam system of a practical refinery verify the applicability of the proposed approach. ? 2013 Elsevier Ltd. All rights reserved. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/409648 | ISSN: | 13594311 | DOI: | 10.1016/j.applthermaleng.2013.04.001 |
顯示於: | 化學工程學系 |
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