(50a) Multi-Unit RTO Implementation Using a Combined Rigorous and Simplified Methodology

Equistar Chemicals, LP has implemented a Real Time Optimization project at its Channelview, Texas complex, which combines two olefins units and downstream recovery units into one RTO model. The project implementation is aimed at creating alignment between the long-term planning optimization models and the plant level controls and operation. 

The multi-unit complex model utilizes a blend of rigorous and simplified methodologies at varying degrees. The underlying multi-variable controller empirical models were utilized to maintain balance among RTO model consistency, speed and robustness. The model was built to optimize and enhance the overall profitability of the complex, while traditional RTO approaches focus more on individual unit optimizations. This paper discusses the methodology, challenges and opportunities involved in the implementation and maintenance of the multi-unit RTO application.