Research on Dynamic Modelling of Amine-based Carbon Capture Pilot Plant Based on gCCS

Flexible operation is an effective strategy to reduce the energy consumption and operation cost for post-combustion carbon capture power plant. A good understanding of the dynamic operating characteristics for carbon capture plants is fundamental for the flexible operation of carbon capture power plant. However, the existing research on the dynamic characteristics of amine-based carbon capture systems is still in its infancy, and there is a lack of research combining experimental data and dynamic modelling. Based on the test data of the Brindisi carbon capture system, a dynamic model of Brindisi carbon capture plant with 50 t CO2/day carbon capture capacity was developed with gCCS software and further verified against both steady and dynamic operation test data. The dynamic response of key parameters under three dynamic scenarios are studied, i.e., the step-change in flue gas flowrate, step-change in solvent flowrate, and step-change in both reboiler steam flowrate and solvent flowrate. Results show that the average error of the temperature distribution of the absorption tower under steady-state operation is 4.37%-8.75%. Under dynamic operating conditions, the gCCS model can predict the changing trend of key parameters well and the dynamic response time of the key parameters has good consistency with the solution circulation time of the Brindisi system. In addition, liquid-gas ratio (L/G) is a key parameter that determines the temperature distribution of the absorption tower, as well as the CO2 capture rate and duty. Therefore, keeping the L/G ratio at a constant value is beneficial to stabilizing the system. © 2021 Chin. Soc. for Elec. Eng.