8Post-combustion CO 2 capture (PCC) plant for a typical 600 MW natural gas fueled thermal power plant was designed as a trade-off between 9 operability and mitigation of the efficiency penalty. Two modified PCC plant configurations with low efficiency penalty were selected. The 10 methodology for designing PCC plants was adapted by incorporating design constraints based on operability and the construction of absorbers.
11This was applied in sizing the equipment of the plants. Two configurations of absorbers were analyzed based on flue gas flow rate at full-load 12 condition and at time-average of an assumed load variation of a power plant operating flexibly. It was found that the absorber designed at time-
This paper discusses the limitations and prospects of using equilibrium-based column models for the dynamic simulation of postcombustion CO2 capture processes. Based on their features, one of three available commercial process simulators was chosen for this study. A pilot plant configuration adopted from literature was modeled and simulated using this simulator. Simulation results were compared with plant data and with results using standard rate-based models as available in literature. Temperature profiles in columns and overall mass and energy balances were found to be similar to plant data; however, CO2 capture-rate, reboiler-duty, and rich-loading using the model were overestimated. A method of reduced stage efficiencies in the absorber was used, which improved performance prediction further with a maximum deviation of 5%. Further, this dynamic model was used to analyze the process subjected to variation in flue gas flow-rate with a similar trend of futuristic power plants by controlling either liquid to gas ratio or CO2 capture-rate. Controlling liquid to gas ratio provided more control over the reboiler-duty while controlling the capture-rate focused on maintaining a certain capture ratio. The advantages and disadvantages of both methods are discussed and based on that, the controlling capture ratio was found suitable for using while power plant works flexibly with stringent emission regulations.
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