Abstract: A method of chemical process simulation includes providing a Sequential-Modular process simulator having a simulation algorithm. Responsive to receiving a process flowsheet creating a directed graph (DG) which represents a topology of the process flowsheet with components interconnected as nodes and process streams including recycle streams represented as cycles, with dependencies between process streams adding cycles. Partitioning the components into a first portion including strongly-connected component groups (SCCGs) along with individual components. An initial location is provided for each cycles for the SCCGs to generate a directed acyclic graph (DAG). An initial calculation order is determined for the flowsheet from the DAG, including an order for calculation within the SCCGs themselves.

Abstract: A method of chemical process simulation includes providing a Sequential-Modular process simulator having a simulation algorithm. Responsive to receiving a process flowsheet creating a directed graph (DG) which represents a topology of the process flowsheet with components interconnected as nodes and process streams including recycle streams represented as cycles, with dependencies between process streams adding cycles. Partitioning the components into a first portion including strongly-connected component groups (SCCGs) along with individual components. An initial location is provided for each cycles for the SCCGs to generate a directed acyclic graph (DAG). An initial calculation order is determined for the flowsheet from the DAG, including an order for calculation within the SCCGs themselves.

Abstract: A method for simulating a chemical process. A process simulator is provided having a processor configured to execute a process model for simulating the chemical process using a flowsheet having a flowsheet topology. The flowsheet topology defines a flow of the chemical process including unit operations connected by fixed process stream connections. The process simulator represents each of the unit operations on the display with several user selectable unit operation options (operation options) that each have its own stored specification parameters. The user is allowed to select at least a first specific set of the operation options. The process simulator generates the flowsheet topology customized with the first specific set of the operation options. A graphical display presentation is generated on the display showing the flowsheet topology customized with the first specific set of the operation options.

Abstract: Processes for catalytic reforming in which a cracking inhibitor, such as an olefin, or a light olefin, is used to inhibit thermal cracking of larger hydrocarbons in non-reactive zones. The cracking inhibitor may be added at various positions through the processes, such as in the recycle gas stream, before a heater, before a stream is passed into a reforming zone, after an effluent stream is recovered from a reforming zone. A molar ratio of cracking inhibitor to hydrocarbons in stream may be between 0.01 and 0.2.

Abstract: Processes for catalytic reforming in which a cracking inhibitor, such as an olefin, or a light olefin, is used to inhibit thermal cracking of larger hydrocarbons in non-reactive zones. The cracking inhibitor may be added at various positions through the processes, such as in the recycle gas stream, before a heater, before a stream is passed into a reforming zone, after an effluent stream is recovered from a reforming zone. A molar ratio of cracking inhibitor to hydrocarbons in stream may be between 0.01 and 0.2.

Abstract: A method includes identifying a simulated input flow stream associated with a chemical processing facility. The input flow stream includes an input component basis with multiple components having one or more properties that differ. The method also includes converting the input flow stream into a simulated output flow stream, which includes an output component basis that differs from the input component basis and comprises a single, active group of oil components and zero or more pure components. A pure component property of a pure component in the input flow stream could be combined with an oil component property of an oil component in the input flow stream. A pure component property of a pure component in the input flow stream could also be transferred to a pure component in the output flow stream without combination. An oil component property of an oil component in the input flow stream could further be mapped to an oil component property of the single output oil component.

Abstract: A method includes obtaining information defining a superstructure associated with a chemical processing facility. The superstructure includes simulated processing elements representing chemical processing elements within the chemical processing facility. The superstructure also includes flow streams representing flows of material between the chemical processing elements. The method also includes identifying a substructure within the superstructure, where the substructure is associated with active simulated processing elements and active flow streams within the superstructure. The method further includes generating a graphical display identifying the superstructure for presentation on a display. Active and inactive simulated processing elements have different indicia in the graphical display, and active and inactive flow streams have different indicia in the graphical display.

Abstract: A method includes obtaining information defining a superstructure associated with a chemical processing facility. The superstructure includes simulated processing elements representing chemical processing elements within the chemical processing facility. The superstructure also includes flow streams representing flows of material between the chemical processing elements. The method also includes identifying a substructure within the superstructure, where the substructure is associated with active simulated processing elements and active flow streams within the superstructure. The method further includes generating a graphical display identifying the superstructure for presentation on a display. Active and inactive simulated processing elements have different indicia in the graphical display, and active and inactive flow streams have different indicia in the graphical display.

Abstract: A method includes identifying a simulated input flow stream associated with a chemical processing facility. The input flow stream includes an input component basis with multiple components having one or more properties that differ. The method also includes converting the input flow stream into a simulated output flow stream, which includes an output component basis that differs from the input component basis and comprises a single, active group of oil components and zero or more pure components. A pure component property of a pure component in the input flow stream could be combined with an oil component property of an oil component in the input flow stream. A pure component property of a pure component in the input flow stream could also be transferred to a pure component in the output flow stream without combination. An oil component property of an oil component in the input flow stream could further be mapped to an oil component property of the single output oil component.