Conclusions and Recommendations
Extended the non-linear model-based control structure of Lee and Sullivan (1988) to permit the use of inferential models in non-linear multivariable control applications
Developed a wide range of inferential models such as the iso-pentane (iC5) and RVP for debutanizer; naphtha final boiling point and kerosene flash point for crude fractionator and octane number for catalytic reforming process. Implemented these models in real-time and integrated with non-linear multi variable control applications to form a closed-loop quality control.
Designed and developed non-linear control strategies for industrial debutanizer using steady state model with approximate dynamics and implemented the control strategies in real time.
Developed a complex non-linear multivariable control structure by formulating the constrained non-linear optimization method that optimizes the performance objectives for crude distillation process subject to constraints. Shell heavy oil fractionator was selected for this purpose, the process dynamic model was built by process identification tests and the model uncertainty was considered explicitly in non-linear controller design. The non-linear control strategies were tested on a 120,000 barrels per day crude-fractionator.
Developed a constrained non-linear optimization algorithm for the reactor section of semi-regenerative catalytic reforming process. Also simulated a dynamic model of the catalytic reforming process and developed an inferential model to predict the reformate octane. Integrated all these models in non-linear model-based control structure and implemented control strategies in real-time.
Extended the application of constrained non-linear multivariable control and optimization to more complex process such as the fluid catalytic cracking (FCC) and developed the dynamic parameter update algorithm for the FCC to reduce the effect of larger modelling errors by regularly updating the selected model parameters. Developed a simplified dynamic model of the process and tested the model in real-time to provide the initial targets for the non-linear controller.
KeywordsOctane Number Fluid Catalytic Crack Internal Model Control Inferential Model Nonminimum Phase
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