Nonlinearity analysis and multi-model modeling of CO2 capture system
Reducing carbon dioxide emissions is an important issue for the environment. The amine-based carbon capture system is a complex system with high energy consumption, and the system needs to be operated flexibly in a wide range. Therefore, advanced control technology is required and an appropriate model is a necessary condition for controller design. To this end, this paper investigates the nonlinearity of the carbon capture system from both the flue gas side and capture rate side. Then, based on the investigation result, a multi-model system is developed which can approximate the dynamics of the CO2 capture process accurately in a wide range and is suited for advanced controller design. Comparisons with single linear model demonstrate the effectiveness of the multi-model modeling approach.