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산업용 시멘트 소성로의 다단사이클론 예열기와 예소성로 내부 유동장 수치해석
이구회(Gu-Hoe Lee),송민정(Min-Jeong Song),장지원(Ji-Won Jang),오세천(Sea-Cheon Oh),김우태(Woo-Tae Kim) 한국열환경공학회 2022 열환경공학 Vol.17 No.2
The turbulent flow field inside an industrial cement kiln was calculated via the finite volume method. The calculation domain includes multistage cyclone preheater, pre-calciner, and a part of rotary kiln. The primary air is supplied through a rotary cement kiln which is connected to the pre-calciner. The steady state velocity field showed that a strong circulating flow pattern was formed in the first and second stage cyclone preheaters. To analyze the blocking effect of solid particles in the pipes attached the cyclone bottom part, the case without the connecting pipes was compared with the reference case with the connecting pipes. As the blockage ratio changes depending on the operating conditions, the simulation results for the two cases provide valuable information for the two extreme situations where the reference case represents non-blocking and the modified case represents complete blocking. To simulate the variable blocking effect of solid particles in the connecting pipes, a part of pipes was filled with porous medium. The effect of viscous resistance of the porous medium on the flow field was numerically investigated.
시멘트 소성로의 염소 바이패스 설비에 대한 전산유동해석
전지민,송민정,이구회,김재형,김우태,권우택,오세천 (사)한국환경에너지공학회 2023 열환경공학 Vol.18 No.2
Regarding carbon neutrality, the cement industry is currently actively planning to reduce greenhouse gas emissions by using alternative fuels to replace coal. In particular, there is a growing interest in using waste plastics as an alternative fuel source, as they have a high calorific value compared to other wastes, and international attention on waste plastics is increasing. However, an increase in the use of waste plastics can lead to an increase in chlorine content within the rotary kiln, which can have a detrimental impact on operational safety and cement quality. Therefore, the application of chlorine bypass facilities to remove chlorine is essential. This study conducted CFD (computational fluid dynamics) analysis to enhance the performance of chlorine bypass facilities. From this work, it was shown that the performance of the facility proposed in this study was superior to that of the existing facility.
산업용 시멘트 소성로에서의 고체 입자의 거동에 대한 수치적 연구
김우태(Woo Tae Kim),이구회(Guhoe Lee),허원(Won Heo),오세천(Sea Cheon Oh),송민정(Min Jeong Song) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The movement of solid particles inside an industrial cement kiln is numerically simulated via the discrete phase model. The steady state velocity field is first calculated using SIMPLEC numerical scheme for the pressure-velocity coupling. Then, solid particles with different diameters are injected at the selected locations near the particle exit at the pre-calciner wall. Without the turbulent dispersion, the movement of solid particles are very limited. Relatively small particles with diameters of 20 or 10 micrometers show active movements both of the upward and downward directions. In addition, solid particles with lower density moves more actively in the two-stage cyclone.
김우태(Woo Tae Kim),이구회(Guhoe Lee),허원(Won Heo),오세천(Sea Cheon Oh),송민정(Min Jeong Song) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The turbulent flow field inside multistage cyclone preheater and pre-calciner is numerically simulated via the finite volume method. The primary air is supplied through a rotary cement kiln which is connected to the pre-calciner. The steady state velocity field shows that a strong circulating flow pattern is formed in the first and second stage cyclone preheaters. To analyze the blocking effect of solid particles in the pipes attached the cyclone bottom part, the case without the connecting pipes are compared with the reference case with the connecting pipes. As the blockage ratio changes depending on the operating conditions, the simulation results for the two cases provide valuable information for the two extreme situations where the reference case represents non-blocking and the modified case represents complete blocking. The modified case shows the stronger circulating flow in the cyclone preheaters.
전산유체역학을 사용하여 시멘트 제조 시 폐플라스틱 보조 연료 사용을 위한 시멘트 킬른 연소반응 해석 연구
이명종(Myeong Jong Lee),전지민(Ji Min Jeon),김재형(Jae Hyung Kim),이구회(Gu hoe Lee),김우태(Woo Tae Kim),오세천(Sea Cheon Oh) 한국환경에너지공학회 2023 한국열환경공학회 학술대회지 Vol.2023 No.1
전 세계적으로 환경문제의 심각성을 인지하고 이 문제를 해결하고자 국제적 협약이 체결되고 있다. 이에 발맞춰 국내에서는 「2050 탄소중립」을 발표하였다. 이를 실천하고자 발표한 탄소중립 시나리오에서 시멘트 업계는 연료 및 원료를 전환하여 CO₂ 배출량을 53% 감축해야 한다. 이 목표를 달성하기 위해 시멘트 제조공정 중 CO₂가 가장 많이 발생하는 소성 공정에서 폐타이어, 폐플라스틱 등 가연성 폐기물을 보조 연료로 사용하고 있다. 폐플라스틱을 보조 연료로 사용하는 경우, 시멘트 킬른의 내부 연소반응을 확인하기 위해 CFD 해석프로고랭 ANSYS 2021 R2를 사용하여 연구를 수행하였다.