Controlling capture plants to avoid CO2 emissions penalties during peak load demand

With the introduction of more and renewables into electricity system, pressure is mounting on thermal power plants to operate in flexible ways. In order capture maximum emissions at lowest cost, integrated with has follow operational regimes parent plant. Therefore, be enough deal load variations meat grid demands. A test campaign been carried out PACT 1tpd CO2 pilot plant investigate flexibility relation variations. Monoethanolamine (40 wt.%) solvent was used from gas turbine representative flue gases containing around 5% CO2. Pressurised Hot Water (PHW) regenerate reboiler. Four Capture scenarios i.e. start-up, minimum stable generation, no-stripping over-stripping, are investigated. No-stripping tests were performed mimic unavailability steam for stripping over varied periods time by stopping PHW flow The results indicate that Specific Reboiler Duty (SRD) increased 8.7 % when stoppage 30 min.. Longer time, longer it takes recover original steady state higher difference between efficiency average period. For over-stripping tests, stripper reduced 0.4 barg value 0.5 a period followed no-stripping. It observed period, recovery time. indicates SRD 36 an hour. conclusion, possible maintain 90 overall efficiency, if over-stripped long but reboiler duty will increased. Optimisation process under these would required achieve commercially-optimised balance increase costs while achieving also minimises emission costs.