Development fo the Instrumentation and Modeling for Heat Transfer Characteristice in CFBC

This technical report summarizes the research conducted and results obtained during the period beginning April 1, 1999 to September 30, 1999. Numerical simulation was used to predict the air velocity and pressure, temperature, and heat transfer characteristics in the CFB system. The radial air velocities changed frequently because of the voidage and gas pressure drop that caused in the heat transfer probe inlet level (k=23). The lower pressure zone was formed near the chamber's center region. The higher pressure zone was formed at the surrounding of the secondary air flow. The lower temperature profiles were shown to be near the CFB riser wall side. In the radial direction, the gas temperature nearest to the center region was higher than that near the wall zone. The heat flux was changed along the radial direction of the CFB riser. The heat transfer probe was designed and installed in the CFB riser. The heat transfer rate at different axial/radial locations of the CFB riser will be measured by the heat transfer probe. A model will be proposed to predict the heat transfer coefficients along the axial and radial variation of the bed in the CFB system