Experimental research on gas-solid flow in a square cyclone separator with double inlets

Abstract

A square cyclone separator with double inlets was developed for a new type Circulating Fluidized Bed (CFB) boiler arrangement scheme including two furnaces. Experiments on the performance and gas-solid flow recorded by a high-speed photography have been conducted in a cold test rig with a separator cross section 400mm×400mm. Experimental results indicated that with the inlet velocity of 22.4m/s and the inlet solids concentration of 4.9g/m 3, the cut size is 15 ?μm, the critical size is 75 μm, and the pressure drop coefficient is 1.7. The performance is also affected by the inlet velocity and solids concentration. The trajectory of particles shows that the particles swirl in the region near the wall and are easily separated. Especially, the instantaneous separation occurred at the corner is very significant for the improvement of the collection efficiency with the high inlet solids concentration for CFB boiler.