Operation Experiences of Oxyfuel Power Plant in Callide Oxyfuel Project

Callide Oxyfuel Project is the only demonstration project for oxyfuel power plant in the world and has been promoted at Callide-A power station in Queensland, Australia. Callide-A power plant, which is a retrofit of an existing power plant with a capacity of 30MWe, is now the largest operating oxyfuel power plant all over the world. Two air separation units (ASU) of 330 TPD and CO2 compression and purification unit (CPU) of 75 TPD that is about 10% capacity of total flue gas were newly installed. And the existing 30MWe boiler was modified to apply both air and oxufuel combustion. This demonstration is the key and important step for the large-scale oxyfuel power plant in the future and the various tests regarding the oxyfuel boiler and CPU have been performed. Main objectives of this project are to demonstrate the oxyfuel operation with CO2 capture and storage using the existing power plant and to obtain the design data and operation know-how for the commercialization. Callide-A oxyfuel boiler with power generation and CO2 purification unit from oxyfuel flue gas have been demonstrated and have given us the various operation results with some test parameters in the Project. Regarding the oxyfuel boiler, the heat absorbed rate, combustion characteristics, trace elements behaviour and plant operation flexibility have been confirmed at the different coal type and the different boiler inlet O2 concentration with the various power generation output through the commissioning and demonstration stage. In this paper, the operational experiences of the oxyfuel power plant in Callide Oxyfuel Project are introduced.