• 한국연소학회:학술대회논문집
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• 한국연소학회 2006년도 제32회 KOSCO SYMPOSIUM 논문집
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• pp.69-74
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• 2006

An Experimental study was conducted on $CO_2$ recycle combustion heating system using pure oxygen instead of conventional air as an oxidant, which is thereby producing a flue gas of mostly $CO_2$ and water vapor($H_2O$) and resulting in higher $CO_2$ concentration. The advantages of the system are not only the ability to control high temperatures characteristic of oxygen combustion with recycling $CO_2$. but also the possibility to reduce NOx emission in the flue gas. A small scale industrial reheating furnace simulator and specially designed variable flame burner were used to characterize the $CO_2$ recycle oxy-fuel combustion, such as the variations of furnace pressure, temperature and composition in the flue gas during recycle. It was found that $CO_2$ concentration in the flue gas was about 80% without $CO_2$ recycle, but increased to $90{\sim}95%$ with $CO_2$ recycle. The furnace temperature and pressure was decreased due to recycle and the NOx emission was also reduced to maintain under 100ppm.

• 한국연소학회지
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• 제18권4호
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• pp.1-11
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• 2013

The oxy-fuel combustion is $CO_2$ capture technology that uses mixture of pure $O_2$ and recirculated exhaust as oxidizer. Currently some Oxy-fuel power plants demonstration project is underway in worldwide. Meanwhile research project for converting 125 MWe Young-Dong power plant to 100 MWe oxy-fuel power plants is progress. In this paper, 1 D 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 $CO_2$ 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 $CO_2$ purity of CPU inlet.

• 한국에너지공학회:학술대회논문집
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• 한국에너지공학회 2006년도 에너지.가스.기후변화학회 연합춘계학술대회 및 특별심포지움
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• pp.412-419
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• 2006

지구온난화의 주원인인 이산화탄소 배출 규제에 대응하기 위한 온실가스 감축 기술개발의 노력이 전 세계적으로 진행되고 있다. 따라서 본 연구에서는 배기가스 중에 $CO_{2}$를 고효율 저비용으로 회수할 수 있는 회수처리기술의 일환으로 효율성과 경제성에 맞추어, 산화제로 공기대신 순산소를 사용하는 $CO_{2}$ 재순환 산소연소 가열로시스템에 관한 실험을 수행하였다. 가재 가열용 연소로 시뮬레이터 및 화염 가변형 버너를 이용하여 $CO_{2}$ 재순환에 따른 로내 온도특성, 압력변화 그리고 배기가스특성을 비교 파악하였다. 실험결과, 배기가스의 대부분은 $CO_{2}$와 $H_{2}O$로 구성되었고, 반복재순환시 배기가스 중의 $H_{2}O$를 응축 분리시켜 고농도($90{\sim}95%$)의 $CO_{2}$를 얻을 수 있었다. 또한 온도를 제어할 수 있는 가능성을 보였고 NOx 배출도 100PPM 이하로 감소시킬 수 있었다.