PCC (Post-combustion Carbon Capture) technology utilizing amine-based liquid absorbents is expected to be one of the most promising carbon capture technologies applicable to coal-fired power plants. This work is to introduce long-term evaluation of PCC demonstration plant named "PICA (PCC by IHI, CSIRO and AGL) pilot plant". PICA is also a name of the project team has been collaborating since 2014. The plant is constructed in AGL Loy Yang Power Station, Australia. Flue gas whose average CO_2 concentration is 13vol% is supplied through the line directly connected to the exhausted gas duct of the power plant. Maximum flow rate of the flue gas is 100 Nm~3/h, and CO_2 capture capacity is 0.5 ton/day. The advanced PCC technology for long-term operation is based on the combination of new liquid absorbent (ISOL-162) and gas-liquid contactor packing which are developed by IHI. The CO_2 capture absorbent regeneration energy of the process is 60% compared to conventional MEA (monoethanolamine)-based PCC process. Cumulative operation time was 5,000 hours by end-March, 2017. The design CO_2 capture ratio of 90% has been achieved and stable plant operation has been confirmed. In an amine-based PCC system, it is known the formation of heat stable salts (HSS) in solvent the absorption liquid potentially leads to amine loss, foaming, fouling and corrosion. The HSS concentration has been measured every 500 hours during the long term operation, and total concentration of HSS anions was lower than maximum acceptable value. Continuous operation and analysis of PICA pilot plant will be kept for evaluation of the performance and robustness of the system.
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