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조성국(Seong Kuk Cho),박흥수(Heung Soo Park),이준석(Junseok Yi),이재달(Jaedal Lee) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
Here, an energy and material recovery system was developed in order to recycle molten blast furnace slag with a temperature near 1400~1500℃. This useful recycling process that produces steam and granulated slag took place in one pressurized water cooling chamber for which a water spraying array was equipped efficiently. Work from the conceptual design to the performance test and analysis was covered in the present development. The system is mainly composed of molten slag injection equipment for which the molten slag is supplied from a slag furnace, a pressurized chamber for slag-water heat transfer, a granulated slag dumper and a condenser to collect steam generated as heat recovery. In comparison with existing heat recovery technologies applying molten iron- and steel-making slags, this recovery facility is designed and installed to simultaneously accomplish the heat recovery that generates steam from water in contact with molten slag and granulated slag formation that is able to be reutilized by replacing clinker in the cement industry. The corresponding results showed 59% in thermal recovery efficiency and 99% in glass content, respectively.
열침원의 온도 변화에 따른 초임계 이산화탄소 재압축 사이클의 탈설계 거동 평가
손성민(Seongmin Son),조성국(Seong Kuk Cho),허진영(Jin Young Heo),이정익(Jeong Ik Lee) 한국에너지기후변화학회 2017 에너지기후변화학회지 Vol.12 No.1
Today, securing environmental friendly energy source became an important global issue. Such energy source can be developed by using a new resource or using the existing energy resource more efficiently. Recently substantial attention was given to the supercritical CO₂ power cycle which can transform the existing electricity production method. The supercritical CO₂ power cycle has advantages of small turbomachinery, simple system, and high thermal efficiency. However, due to non-linear properties’ variation near the critical point, the off-design performance prediction of the cycle still requires further research. Thus, the research team have analyzed the off-design behavior of the supercritical CO₂ cycle according to the temperature change of the heat sink. The target cycle in the study is a 100 MW scale supercritical CO₂ recompression Brayton cycle layout, and the off-design behavior was analyzed when the temperature of the heat sink increases from the design point of 32 °C to 50 °C. The system maximum pressure was assumed to be remained the same as the design point. In the analyzed temperature range, the system efficiency is calculated to decrease by 11.5%p from 44% to 32.5%, and the thermodynamic work of the cycle is expected to decrease by about 38MW, from 108 MW to 70 MW. In the process of changing the system minimum pressure during the analysis, necessity for new optimizations to meet the off-design operating condition was found. This suggests that optimizing the rpm of the turbomachinery and the overall system capacity to meet operating conditions will be an important research topic in the future.