(276f) Process Flow Sheet Optimization and Techno-Economic Assessment of Post-Combustion CO2 Capture Using Heat Integrated, Sub-Ambient PSA
Flue gas compression and cooling is major cost elements and tradeoffs between the capital cost of the heat exchangers and compressor train and utility use are explored. In the optimization model, the major components are considered including the gas-gas heat exchanger to recover the cold utility from the CO2 stripped flue gas and the work recovery from the stream for gas compression. The optimization problem is solved by considering a superstructure that embeds the different options of multistage compression and cooling. Some optimal designs are considered as case studies to perform high-level technoeconomic analysis. After the technoeconomic analysis, the optimization models discussed earlier are refined and updated, thus making the entire effort iterative. To estimate the capital cost, only major components are considered such as fiber modules, compressors, turbines, and heat exchangers utilizing the existing models. The specifications given by NETL for a 550MW (net) power plant is used and our initial studies show the CO2 capture cost to be below $25.0/ton.