Dynamic simulation and control of carbon dioxide capture system using chemicalabsorption
| Autor: | Ming-Tien Shen, 沈明典 |
|---|---|
| Rok vydání: | 2018 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 106 Fossil fuel power generation will still be major energy supply method, hence the carbon capture for power plant flue gas is essential for the control of global warming. Chemical absorption using amine solvents has been identified as the most feasible technology for post-combustion carbon capture. However, the high energy consumption is still a major problem and requires the development of high-efficient solvents, energy-saving flowsheets, optimal operation conditions and effective process control. Although rigorous steady-state rate-based models are available in commercial process simulation software, no rigorous dynamic rate-based model is provided in the most popular process simulation software Aspen. In this study, for a 300 MW coal-fired power plant, a dynamic rate-based model for the overall amine-based absorption processes has been developed on the Aspen Custom Modeler platform and verified using literature reported pilot plant data. The model was further utilized for steady state optimization of the standard flowsheet as well as an energy-saving alternative flowsheet, i.e. the inter-cooling absorption process. Several optimal-based control schemes were proposed and compared to the conventional control scheme for the control performance. For both steady state and dynamic operations, the model simulation results were in good agreement with the NTNU pilot plant data. The minimum reboiler-duty optimization study gives the unit energy consumption results of 4.09 and 3.92 GJ/ton CO2 for the standard and energy-saving processes, respectively. For the standard a processes, the best control scheme is LG-TStr. Compared to the conventional control scheme, CC-TStr, the stabilization period CO2 emission and reboiler-duty can be reduced by 62% and 66%, respectively. For the energy-saving processes, the best control scheme is LG-LL-TIC. Compared to the conventional control scheme, CC-TStr- TIC, the stabilization period CO2 emission is not reduced, but the reboiler-duty can be reduced by 66%. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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