Nonlinear dynamic analysis and control design of a solvent-based post-combustion CO2 capture process

作者：Wu, Xiao^*; Shen, Jiong; Li, Yiguo; Wang, Meihong^*; Lawal, Adekola; Lee, Kwang Y.

来源：Computers & Chemical Engineering, 2018, 115: 397-406.

DOI：10.1016/j.compchemeng.2018.04.028

• Solvent-based post-combustion carbon capture
• Dynamic behavior variations
• Nonlinearity investigation
• Gap-metric
• Model predictve control

A flexible operation of the solvent-based post-combustion CO2 capture (PCC) process is of great importance to make the technology widely used in the power industry. However, in case of a wide range of operation, the presence of process nonlinearity may degrade the performance of the pre-designed linear controller. This paper gives a comprehensive analysis of the dynamic behavior and nonlinearity distribution of the PCC process. Three cases are taken into account during the investigation: 1) capture rate change; 2) flue gas flowrate change; and 3) re-boiler temperature change. The investigations show that the CO2 capture process does have strong nonlinearity; however, by selecting a suitable control target and operating range, a single linear controller is possible to control the capture system within this range. Based on the analysis results, a linear model predictive controller is designed for the CO2 capture process. Simulations of the designed controller on an MEA based PCC plant demonstrate the effectiveness of the proposed control approach.

• 出版日期2018-7-12
• 单位东南大学