Hydrogen management is important for refineries to improve their business efficiency.Various approaches such as pinch analysis and mathematical programming have been employed in the management of hydrogen system.Howev...Hydrogen management is important for refineries to improve their business efficiency.Various approaches such as pinch analysis and mathematical programming have been employed in the management of hydrogen system.However,it is not easy for site engineers to implement these techniques,due to the complicated procedures.At this point,it is necessary to develop a software that can implement the proposed methodologies automatically,which is really the goal of this work.The presented refinery hydrogen system optimization software(RHO)is a web based system.It is developed in the Java Web environment,where the subroutines of mathematical model developed in GAMS software can be easily called.RHO can generate graphics of both the hydrogen pinch diagram and the hydrogen distribution network.The purifiers as well as the physical distances between units are considered in the optimization model.In addition,there is a special module for the calculation of membrane separation,which is very important in the hydrogen network.The functions and the interfaces of the software are illustrated via practical cases.Case studies show the effectiveness of the RHO software.展开更多
A model for repairable standby parallel system consisting of two identical components with common cause failure(CCF)and human error is introduced in this article by a semigroup approach.The stability of the system is ...A model for repairable standby parallel system consisting of two identical components with common cause failure(CCF)and human error is introduced in this article by a semigroup approach.The stability of the system is verified by the pure analysis technique,the co-final related theory and functional analysis method.It is discussed that four different reliability indices of the studied model are consistent with each other both analytically and numerically.The simulations and comparisons demonstrate the validity of the proposed technique.展开更多
基金The financial support provided by the Project of National Natural Science Foundation of China(21822809&21978256)the National Science Fund for Distinguished Young(21525627)+1 种基金the Fundamental Research Funds for the Central Universities(2019XZZX004-03)Ningxia Collaborative Innovation Center for Value Upgrading of Coal-based Synthetic Resin(2017DC57)。
文摘Hydrogen management is important for refineries to improve their business efficiency.Various approaches such as pinch analysis and mathematical programming have been employed in the management of hydrogen system.However,it is not easy for site engineers to implement these techniques,due to the complicated procedures.At this point,it is necessary to develop a software that can implement the proposed methodologies automatically,which is really the goal of this work.The presented refinery hydrogen system optimization software(RHO)is a web based system.It is developed in the Java Web environment,where the subroutines of mathematical model developed in GAMS software can be easily called.RHO can generate graphics of both the hydrogen pinch diagram and the hydrogen distribution network.The purifiers as well as the physical distances between units are considered in the optimization model.In addition,there is a special module for the calculation of membrane separation,which is very important in the hydrogen network.The functions and the interfaces of the software are illustrated via practical cases.Case studies show the effectiveness of the RHO software.
基金Heilongjiang Province Higher Educa-tion Basic Research Business Fee Research Project(No.1353MSY YB017)Daqing Normal University Natural Science Foundation(No.19ZR04)。
文摘A model for repairable standby parallel system consisting of two identical components with common cause failure(CCF)and human error is introduced in this article by a semigroup approach.The stability of the system is verified by the pure analysis technique,the co-final related theory and functional analysis method.It is discussed that four different reliability indices of the studied model are consistent with each other both analytically and numerically.The simulations and comparisons demonstrate the validity of the proposed technique.
