MINI POWER HOUSES USING FLUIDISED BED COMBUSTION.

Stone Platt Fluidfire have developed their fluidized bed water tube boiler design to incorporate a simple convective superheater, making an ideal match with the rugged Peter Brotherhood impulse turbine. The combination of components has resulted in packaged power houses in the range of 1, 3, 5, 7. 5 and 10 MW electrical output. The unique Fluidfire concave bed draws the fluidized solids down in the center and returns them to the surface at the sides. The fuel, coal or refuse derived fuel is screw fed below the surface in the center of the bed, so that the hot downward moving solids envelop the fresh fuel and cause it to circulate. The resulting substantial residence time for fuel particles below the surface is sufficient to achieve complete burn-out. In the event of high sulfur coals being burnt, a dolomite or limestone feed may be incorporated in order to achieve an 80-90% absorption within the body of the bed. This causes the formation of inert calcium sulfate in the ash, and lowers the sulfur dioxide emission in the stack to well below EPA requirements.