On the cost of zero carbon electricity: A techno-economic analysis of combined cycle gas turbines with post-combustion CO2 capture

Monoethanolamine Degradation Rates in Post-combustion CO2 Capture Plants with the Capture of 100% of the Added CO2

“…The outputs of the process modeling are described in Section 3.1 are detailed in Table 4. As previously described by Mullen et al 5,6 and Su et al, 11 when lean loading is reduced accordingly as CO 2 capture fraction increases and regeneration conditions are optimized, minimal differences in the specific energy requirements are observed, and in some cases, a reduction is seen. This is most pronounced in the CCGT case as the driving force of absorption at the top of the absorber is still moderately low, even for a 95% CO 2 capture rate at a lean loading of 0.2 mol/ mol.…”

“…30 This model is validated against pilot-scale data from the US National Carbon Capture Centre (NCCC). 31 The reader is referred to Mullen et al 5,6 for a detailed description of the process modeling. However, the process does not notably differ from that of a traditional amine CO 2 capture plant.…”

“…MEA solution was used in all cases. Flue gas compositions and flow rates were extracted from previously completed works by Mullen et al 5,6 and Su et al 11 For each of the cases described in Table 1, the stripper pressure is modified to ensure that the inflection point described in Michailos and Gibbins 12 is not passed. This leads to variable stripper operational pressures and, by extension, solvent regeneration temperature.…”

“…However, it typically falls between 99.2% for a CCGT up to 99.8% for a steam methane reformer (SMR). Mullen et al , term this CO 2 capture fraction as 100% fossil CO 2 capture; however, 100% added CO 2 will be used in this article to account for biogenic CO 2 . This terminology will be adopted throughout this article, while capture fractions below this will be reported as gross CO 2 capture fractions, as is typical for the industry. normalFossil 0.25em CO 2 0.25em normalcapture 0.25em normalfraction = m CO 2 , normalT&S m CO 2 , normalproduced − m CO 2 , normalatmospheric false( % false) where m CO 2 ,T&S is the mass of CO 2 exported to transport and storage, m CO 2 ,produced is the mass of CO 2 produced during the process, and m CO 2 ,atmospheric is the mass of atmospheric CO 2 entering the process.…”

“…Increasingly, CO 2 capture fractions above 95% up to, or slightly above, 100% added CO 2 capture is the focus of emerging research. Mullen and Lucquiaud provide a detailed analysis of the currently available literature, critically assessing seven modeling studies − and six pilot plant facilities − where CO 2 capture fractions over 95% were achieved. The authors identify lean loading as the critical factor to ensure thermodynamically efficient operation at increased CO 2 capture fractions.…”