Radial Heat Transfer Investigations in a Circulating Fluidized Bed Burning Makarwal Coal

In the present paper, a detailed parametric study is conducted on the radial heat transfer studies in a locally  fabricated circulating fluidized bed combustor by burning Makarwal coal. The variations of radial heat transfer coefficients in a CFB combustor with different operating parameters are investigated. The experimental set up consists of a riser of a circulating fluidized bed (152 mm ID and 6 m high). A radial heat transfer probe (2" thick & 15.4 cm ID) was used for these investigations. Silica sand of 2500 Kg/m3 and having average particle size of 125 µm is used as bed material. A detail radial temperature profile was also investigated during the experimental runs. It was found that radial heat transfer coefficient increased with increase in suspension density, bed temperature and solid circulation rate