29-08-2017, 09:33 AM
Thermal energy needs to operate on a daily basis with frequent and rapid load changes to balance large variations in intermittent energy sources such as wind and solar energy. In order for the integration of carbon sequestration into power plants to be economically and technically feasible, the carbon sequestration process must be able to follow these rapid and large load changes without diminishing the overall performance of the carbon capture plant. Therefore, dynamic models for simulation, optimization and design of the control system are essential.
In this paper we compare the transient behavior of the model with the dynamic pilot data for the absorption and desorption of CO2 for changes in the flow rate of the combustion gases. In addition, we investigated the dynamic behavior of a full scale post-combustion capture plant using monoethanolamine (MEA) and piperazine (PZ). This analysis demonstrates the good agreement between the developed model (dCAPCO2) and the pilot measurements under both transient and stationary conditions. It describes how the time needed to reach a new steady state varies with respect to the type of amine and concentration. The simulation study reveals that it is essential to control the flow of lean solvent to avoid sudden changes in the rate of CO2 removal and to avoid the increase in the demand for heat from solvent regeneration. In addition, it shows how storage tanks (system retention liquids) can be designed to accommodate significant changes in the direction of the power plant. This flexibility is especially necessary for operation in the future mixed green energy market.
In this paper we compare the transient behavior of the model with the dynamic pilot data for the absorption and desorption of CO2 for changes in the flow rate of the combustion gases. In addition, we investigated the dynamic behavior of a full scale post-combustion capture plant using monoethanolamine (MEA) and piperazine (PZ). This analysis demonstrates the good agreement between the developed model (dCAPCO2) and the pilot measurements under both transient and stationary conditions. It describes how the time needed to reach a new steady state varies with respect to the type of amine and concentration. The simulation study reveals that it is essential to control the flow of lean solvent to avoid sudden changes in the rate of CO2 removal and to avoid the increase in the demand for heat from solvent regeneration. In addition, it shows how storage tanks (system retention liquids) can be designed to accommodate significant changes in the direction of the power plant. This flexibility is especially necessary for operation in the future mixed green energy market.