Fin heat transfer studies in the cyclone separator of a circulating fluidized bed

Effect of fins on the average heat transfer coefficient inside the cyclone separator of a circulating fluidized bed (CFB)for different operating parameters, viz., solid circulation rate, gas superficial velocity, and pressure drop, has been investigated. The cyclone separator is an integral part of a CFB and is specially fabricated according to the high-efficiency Lapple design [1] to accommodate two identical heat transfer probes in series. For the same operating conditions, the incorporation of fins results in a drop of heat transfer coefficient, but the total heat transfer increases with the increased surface area, more than compensating for this drop. It is also observed that the heat transfer coefficient increases linearly with the increase of solid circulation rate, gas superficial velocity as well as pressure drop. The collection efficiency of the cyclone separator is found to decrease with increase in solid circulation rate as well as with the pressure drop. ft is also noted that the collection efficiency decreases with the incorporation of fins, but the collection efficiency is always found to be greater than 99.10%.