Hydrocarbon processing analysis
Tools and methods are provided for supplementing an optimization solution for an objective function based on a model of one or more hydrocarbon refining and/or conversion and/or chemical production processes with supporting analysis. The supporting analysis can illustrate for a user how the nature of the feed(s) and/or the selected processing conditions and/or the quality of the product(s) contributes to the optimized solution. A user interface is also provided to facilitate viewing of the information by a user. The supporting analysis can allow a user to understand the factors in the optimized solution that contribute in a significant way.
1. A method for analyzing a solution from a hydrocarbon processing model comprising:
generating converted shadow values from an optimized solution for an objective function of a hydrocarbon processing model, wherein the hydrocarbon processing model comprises a model of a refinery, a refinery process, a chemical processing plant, a process in a chemical processing plant, or a combination thereof, wherein the hydrocarbon processing model includes at least one of a real-time optimization model of the refinery, the refinery process, the chemical processing plant, the process in the chemical processing plant, or a combination thereof, and an Optimizable Refinery Model (“ORM”) model of the refinery, the refinery process, the chemical processing plant, the process in the chemical processing plant, or a combination thereof;
displaying a plurality of the converted shadow values, wherein displaying a plurality of the converted shadow values comprises displaying a listing of a plurality of selected converted shadow values within the determined converted shadow values, the plurality of selected converted shadow values including a) at least one converted shadow value having a value greater than a first threshold percentage of a sum of the determined converted shadow values, b) at least one converted shadow value having an absolute value greater than a second threshold percentage of the determined converted shadow values, or c) a combination thereof;
tracking a stream corresponding to at least one displayed converted shadow value to identify related converted shadow values, wherein at least one related converted shadow value being different from the displayed plurality of converted shadow values, wherein tracking a stream comprises (i) selecting a stream comprising a feed stream or a distillation stream formed from the feed stream, (ii) identifying a plurality of constraints located downstream in a process flow from the selected stream, and (iii) identifying related converted shadow values corresponding to the plurality of constraints located downstream in the process flow;
displaying one or more identified related converted shadow values;
performing sensitivity analysis for at least one active constraint corresponding to at least one converted shadow value from the displayed plurality of converted shadow values or the identified related converted shadow values, wherein the active constraint corresponding to the at least one converted shadow value comprises a product property constraint, a product yield constraint, or a combination thereof;
performing constraint relaxation for the active constraint corresponding to the at least one converted shadow value to generate a relaxed optimized solution; and
displaying in a user interface at least one converted shadow value corresponding to the optimized solution and at least one converted shadow value corresponding to the relaxed optimized solution.
2. The method of claim 1 , wherein the at least one related converted shadow value comprises a converted shadow value for an independent variable, at least one displayed converted shadow value and the at least one related converted shadow value being unrelated in the underlying hydrocarbon processing system corresponding to the hydrocarbon processing model.
3. The method of claim 1 , wherein the sensitivity analysis is performed for a plurality of active constraints.
4. The method of claim 1 , wherein one or more results from the sensitivity analysis are displayed, one or more results from constraint relaxation are displayed, or a combination thereof.
5. The method of claim 1 , wherein tracking a stream comprises tracking at least one stream related to each displayed converted shadow value.
6. The method of claim 1 , further comprising displaying at least one converted shadow value corresponding to the optimized solution and at least one converted shadow value corresponding to a second optimized solution, the second optimized solution being based on a different hydrocarbon processing model.
7. The method of claim 6 , wherein the second optimized solution is based on a second hydrocarbon processing model corresponding to the hydrocarbon processing model with at least one constraint removed.