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Dowon Shun
Dowon Shun is currently the Dean of the KIERSCHOOL of Korea Institute of Energy Research. He has been working on Circulating Fluidized Bed Combustion of solid fuel. He designed the 10MWe CFBC for the solid recycled fuel in 2007 and that was the first domestically designed unit for the same kind. In 2015, also he participated a Turkish national project of repowering coal plant and designed a 22MWe CFBC for low rank Turkish coal in Soma, Turkey. His recent work is the development of a 2MWe supercritical oxy combustion CFBC for biomass and low rank coal. His team demonstrated over 90% of CO2 concentration in flue gas in overall 80% CO2 of oxy condition operation. With the final fluid quality of 450℃ and 235bara, this facility was operated over 200hrs in continuous mode. His academic carrier is also reached the corrosion control of super heater boiler tubes during high salt fuel combustion. The effect of solid and liquid additives to capture the alkaline oxides were performed in commercial scale CFBC boilers and the results were published. Currently he is a member of The Korean Institute of Chemical Engineers, The Korean Society of Industrial and Engineering Chemistry and The Korea Society of Waste Management.
Presentation title: Development of a 2 MWe Supercritical Oxy Combustion CFBC for Biomass.
Abstract: The part of the future energy plant project performed in 2015 – 2021, this team developed a 2MWe CFBC with oxy combustion. The design includes the water circuit to attain 235bara and 450℃ condition, the combustor condition to handle biomass and solid recycled fuel. The plant was repowered from the old 2MWe 45bara 450℃ boiler, thus utilization of existing 45bara steam generator was essential. In order to produce 45arar steam for the existing generator the final fluid from the super heater circuit was de pressurized and the convection pass was re-designed to re-heat the final steam. The design was in house and fabrication of the boiler and the construction were by the local contractors. The key issue of the project was how to down scale the supercritical boiler to 2MWe. This design minimized parts and accessories of the conventional supercritical CFBCs.
The operation of the boiler included multiple fuel combustion, those were bituminous coal, solid recycled fuel and biomass. Combustion efficiency of biomass was over 99%. Also the oxy combustion condition was tested by mixing pure oxygen with recycled flue gas. The duration of the operation was over 200 hours. During oxy combustion over 90% of CO2 in flue gas was attained.
This work was supported by the National Research Council of Science & Technology (NST) grant by the Korea government (MSIP) (No. CRC-15-07-KIER).