A Study on the Augmentation of Thermal Efficiency and the Development for the Fulidized Bed Combustor Untilizing Korean Low Grade Anthracite Coals

국산(國産) 저질무연탄(低質無煙炭) 연소용(燃燒用) 유동층(流動層) 연소로(燃燒爐) 개발(開發) 및 열효율(熱效率) 증대(增大)에 관한 연구(硏究)

Characteristics of heat transfer in a smooth and finned tube located vertically in atmospheric fluidized bed combustor which uses low grade anthracite coals was studied. Experiments to investigate the characteristics of heat transfer between smooth and finned tube are carried out and the results depend on particle size, fluidizing air velocity and bed temperature are summarized. It is found that heat transfer coefficient of the smooth and finned tube increases with decrease in particle diameter and increase in bed temperature. Furthermore, it is noted that heat transfer coefficient increase at the first with increase in the velocity of fluidizing air and tends to decrease at a certain fluidizing air velocity. The increase of heat transfer coefficient for the finned tube is appeared to be increased in 30% compared to that for the smooth tube.