100MWe급 순산소연소 발전소 보일러계통 공정설계 및 운전변수 민감도 예측
100MWe Oxyfuel power plant boiler system process design and operation parameters sensitivity analysis
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초록
The oxy-fuel combustion is CO2 capture technology that uses mixture of pure O2 and recirculated exhaust as oxidizer. Currently some Oxy-fuel power plants demonstration project is underway in worldwide. Meanwhile research project for converting 125MWe Young-Dong power plant to 100MWe oxy-fuel power plants is progress. In this paper, 1D process analytical approach was applied for conducting process design and operating parameters sensitivity analysis for oxy-fuel combustion of Young-Dong power plant. As a result, appropriate gas recirculation rates was 74.3% that in order to maintain normal rating superheater, reheater steam temperature and boiler heat transfer patterns. And boiler efficiency 85.0%, CPU inlet CO2 mole concentration 71.34% was predicted for retrofitted boiler. The oxygen concentration in the secondary recycle gas is predicted as 27.1%. Meanwhile the oxygen concentration 22.4% and moisture concentration 5.3% predicted for primary recycle gas. As the primary and secondary gas recirculation increases, then heat absorption of the reheater is tends to increases whereas superheater side is decreased, and also the efficiency is tends to decrease, according to results of sensitivity analysis for operating parameters. In addition, the ambient air ingression have a tendency to lead to decline of efficiency for boiler as well as decline of CO2 purity of CPU inlet.
Abstract
The oxy-fuel combustion is CO2 capture technology that uses mixture of pure O2 and recirculated exhaust as oxidizer. Currently some Oxy-fuel power plants demonstration project is underway in worldwide. Meanwhile research project for converting 125MWe Young-Dong power plant to 100MWe oxy-fuel power plants is progress. In this paper, 1D process analytical approach was applied for conducting process design and operating parameters sensitivity analysis for oxy-fuel combustion of Young-Dong power plant. As a result, appropriate gas recirculation rates was 74.3% that in order to maintain normal rating superheater, reheater steam temperature and boiler heat transfer patterns. And boiler efficiency 85.0%, CPU inlet CO2 mole concentration 71.34% was predicted for retrofitted boiler. The oxygen concentration in the secondary recycle gas is predicted as 27.1%. Meanwhile the oxygen concentration 22.4% and moisture concentration 5.3% predicted for primary recycle gas. As the primary and secondary gas recirculation increases, then heat absorption of the reheater is tends to increases whereas superheater side is decreased, and also the efficiency is tends to decrease, according to results of sensitivity analysis for operating parameters. In addition, the ambient air ingression have a tendency to lead to decline of efficiency for boiler as well as decline of CO2 purity of CPU inlet.
참고문헌 (9)
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- 채태영, "전산유동해석을 이용한 100MWe급 석탄 순산소 연소 실증 보일러의 설계 및 운전조건 평가", 한국연소학회지, 16(2), pp.1~8 (2011), 한국연소학회
- 김정은, "100 MWe급 석탄 순산소 연소 실증 보일러의 연소 특성에 대한 전산유동해석 연구", 제 44회 KOSCO SYMPOSIUM 초록집, pp.337~339 (2012)
- 김정은, "100 MWe급 석탄 순산소 연소 보일러의 탄종별 연소 특성에 대한 전산해석 연구", 45회 KOSCO SYMPOSIUM 초록집 (2012)
- Wei Zhou, "Process Evaluation of Oxy-fuel Combustion with Flue Gas Recycle in a Conventional Utility Boiler", Energy Fuels, 24(3), pp.2162~62169 (2010)
- John Smart, "Characterisation of an oxy-coal flame through digital imaging", Combustion and Flame, 157(6), pp.1132~1139 (2010)