Investigation of heat transfer and combustion in the advanced fluidized bed combustor (FBC). Technical progress report No. 10, [January 1, 1996--March 31, 1996]

This technical report summarizes the research performed and progress achieved during the period of January 1, 1996 to March 31, 1996. Numerical modeling and simulation on the gas velocity and pressure were performed to understand swirling, recirculating, turbulent flow in the test chamber. The flow pattern and the pressure profiles were predicted. At the bottom of the chamber, the velocity at the center is greater than that of the wall region. When the secondary air is injected into the chamber, gas velocity decreases rapidly but the whole chamber receives a swirling flow. The profiles show that the gas at the near wall region flows down to the bottom and flows up at the center region, and velocity at the center region increases up along the axis of the combustor chamber. The pressure at the outer region near the wall is greater than that at the inner region near the axis. The pressure at the bottom is greater than that at the top region. The higher pressure zone is formed surrounding the secondary air flow into the center region. The exploratory hot model was designed to better understand the combustion process and the local heat transfer phenomena in the combustor chamber. Design and fabrication of the exploratory hot model will be continued with an arrangement of the auxiliary subsystems. Instrumentation for the system test will be arranged with a computer-assisted data acquisition system. 7 refs., 17 figs., 2 tabs