Advanced Model-Based Optimization of a Commercial Natural Gas Liquid Recovery Unit

In this paper we use the example of a commercial NGL Plant in Abu Dhabi to explain the practical benefits of Advanced Model-based Optimization. We will describe and show how the key first step in such a study is validation: ensuring that model predictions of key results are matching the actual plant behavior. We will describe how the model is then used to understand the best operational strategies for the facility through modelbased optimization. This demonstrates how the approach used overcomes the limitations of the typical workflow and models used, in particular, the ones based on the Sequential Modular approach. The trial-and-error simulations used in this approach are not only time consuming and error prone but often limited in the operating decisions and constraints that can be considered. We will show how using an Equation Oriented environment overcomes these limitations and allows an optimal solution satisfying all operational and safety constraints to be found using mathematical optimization methods. Finally we will show how this leads to the set-up of operating guidelines to allow operators to drive the plant towards optimal operation; giving them the ability to respond to changes in the plant or economic conditions quicker and with more confidence than previously possible.