Abstract
Modeling has been used for a very long time for the design and for improved operation of gas processing and transmission facilities. The use of steady-state models is universally accepted in all stages of the design and operation of gas processing plants. Dynamic simulation has been used for a long time, but rigorous first principles of dynamic simulation have been confined to use by specialists and control engineers who were using models based on transfer functions that were incapable of representing the nonlinearities in systems and the discontinuities in start-up cases, for example. Only since the late 1990s has dynamic simulation become a more generally accepted tool used by process engineers and control engineers alike. The software available today enables process engineers with some process control knowledge and control engineers with some process knowledge to build dynamic models fairly easily. This chapter discusses the areas of application of dynamic process modeling and modeling considerations, both general and for specific equipment frequently used in gas processing plants. The use of dynamic models in specific gas processing units is analyzed. Some case studies are presented to illustrate the use and impact of dynamic simulation on the design and operation of gas processing and transmission plants.
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