경량골재 로타리킬른의 운전최적화를 위한 석탄연소 및 원료입자 승온특성 해석
Analysis of Coal Combustion and Particle Temperature Profiles in a Rotary Kiln for Production of Light-weight Aggregate
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Bottom ash from a coal-fired power plant is usually landfilled to a nearby site, which causes a growingenvironmental concern and increased operating costs. One way of recycling the bottom ash is to produce lightweightaggregate (LWA) using a rotary kiln. This study investigated the temperature profiles of raw LWAparticles in a rotary kiln to identify the range of operating conditions appropriate for ideal bloating. For thispurpose, a new simulation method was developed to integrate a 1-dimensional model for the bed of LWAparticles and the computational fluid dynamics (CFD) for the fuel combustion and gas flow. The temperatureof LWA particles was found very sensitive to the changes in the air preheating temperature and excess airratio. Therefore, an accurate control of the operation parameters was essential to achieve the bloating of LWAparticles without excessive sintering or melting.
Abstract
Bottom ash from a coal-fired power plant is usually landfilled to a nearby site, which causes a growingenvironmental concern and increased operating costs. One way of recycling the bottom ash is to produce lightweightaggregate (LWA) using a rotary kiln. This study investigated the temperature profiles of raw LWAparticles in a rotary kiln to identify the range of operating conditions appropriate for ideal bloating. For thispurpose, a new simulation method was developed to integrate a 1-dimensional model for the bed of LWAparticles and the computational fluid dynamics (CFD) for the fuel combustion and gas flow. The temperatureof LWA particles was found very sensitive to the changes in the air preheating temperature and excess airratio. Therefore, an accurate control of the operation parameters was essential to achieve the bloating of LWAparticles without excessive sintering or melting.
참고문헌 (14)
- S. Chandra, "Lightweight Aggregate Concrete", pp.369~400 (2003), Noyes publications
- 강신휴, "석탄회를 재활용한 인공경량골재의 발포거동에 관한 연구 : Fe, C의 역할", 석사, 신소재공학과, pp.2012
- 전국현, "표면개질 인공경량골재의 발포거동에 대한 연구", 석사, 신소재공학과, pp.2012
- Fluent Inc, "Fluent 6.3 user's guide" (2006), Lebanon, New Hampshire
- C. Ryu, "Combined bed combustion and gas flow simulation for a grate type incinerator", J. Air Waste Manag. Assoc., 52, pp.189~197 (2002)
- S. Niksa, "Predicting the devolatilization behavior of any coal from its ultimate analysis", Combustion and Flame, 100, pp.384~394 (1995)
- C. Y. Wen, "Entrainment coal gasification modeling", Ind. Eng. Chem. Proc. Des. Dev., 18, pp.684~695 (1979)
- T. F. Smith, "Evaluation of coefficients for the weighted sum of gray gases model", J. Heat Transf., 104, pp.602~608 (1982)
- A. Coppalle, "The total emissivities of high-temperature flames", Combust. Flame, 49, pp.101~108 (1983)
- S.H. Tscheng, "Convective heat transfer in rotary kiln", The Canadian J. Chem. Eng., 57, pp.433~443 (1979)
- K.S. Mujumdar, "Simulation of rotary cement kilns using a one-dimensional model", Chem. Eng. Res. Des., 84, pp.165~177 (2006)
- S.-Q. Li, "A mathematical model of heat transfer in a rotary kiln thermo-reactor", Chem. Eng. Technol., 28, pp.1480~1489 (2005)
- R. Zhang, "Theoretical and experimental analysis of bed-to-wall heat transfer in heat recovery processing", Powder Technol., 249, pp.186~195 (2013)
- 엄민제, "로터리킬른 반응기 설계를 위한 성능해석 모형", 한국연소학회지, 18(3), pp.9~23 (2013), 한국연소학회