Optimization of the various modes of flexible operation for post-combustion CO2 capture plant

Optimisation and evaluation of flexible operation strategies for coal- and gas-CCS power stations with a multi-period design approach

“…Here, the performance of this system was evaluated under part-load conditions, with a key observation being that the whilst the cost structure of the integrated process remains approximately constant for o-design point operation, this will appreciably increase the levelised cost of electricity (LCOE) of these plants, which may have implications for the average price of electricity of the systems in which these processes are integrated. Two recent contributions discuss the rigorous optimisation of exible CCS systems; that of Mac Dowell and Shah [8] and Zaman and Lee [28]. In their work, Zaman [28], presented an optimisation model for a post-combustion capture model for three exible congurations: exhaust gas venting, solvent storage and combination.…”

“…Two recent contributions discuss the rigorous optimisation of exible CCS systems; that of Mac Dowell and Shah [8] and Zaman and Lee [28]. In their work, Zaman [28], presented an optimisation model for a post-combustion capture model for three exible congurations: exhaust gas venting, solvent storage and combination. Compared to the base case, the three modes of operation showed 3.04%, 10.1% and 11.08% savings, respectively.…”

“…As was mentioned in the introduction, many studies in the literature exclude the capital cost associated with the storage tanks, and conclude that the solvent storage scenario can have an additional prot of approximately 3.5% [28]. We 475 have also examined this option and arrive at the same conclusion -we achieve an increase in protability of 3.3% savings for the 10,000 m 3 tank size relative to the base case, after the solvent storage capital cost has been paid o.…”

“…Here, in the case of solvent storage, an approximation of the additional capital cost associated with the infrastructure required for solvent storage was provided, but a detailed design of that equipment was not performed. Following this study, several contributions focused on exible operation of the capture process as a way to improve the economics of CCS power plants either by reducing the capture level through exhaust gas venting, by storing the solvent using rich and lean amine storage tanks or by varying the degree of solvent regeneration [5], [6], [7], [8], [11], [12], [13], [14], [15], [16], [17] [18], [19], [20], [21], [22], [23], [24], [25], [26], [27], [28], [29], [30].…”

Process control of the advanced flash stripper for CO2 solvent regeneration

“…Flexible capture refers to manipulating the steam extraction flowrate in order to change the rate of electricity production. With this strategy, the capture plant is used as either an ancillary service to respond to peak demand or a quasi-producer that can bid in to electricity markets during high-price periods [29][30][31][32]. In Case 4, a flexible capture scenario was examined where the high-temperature amine set point (either T SH,sp for Option 1 or T LH,sp for Option 2) was decreased in steps over time.…”