Abstract
The fluidized-bed combustion chamber for marine boilers burns fuel oil under heeling and rolling conditions. The performance of the fluidized bed was studied with three experimental fluidized beds. One test bed was stationary and 150mm in diameter. Another was 500mm×150mm in size and was sit on a heeling and rolling rig. Using the two beds, cold tests without firing were carried out to see the behaviour of the fluidized bed. The other was also stationary and 150mm in diameter. Fuel oil was burnt in this bed under various operating conditions.
Under cold condition, the stationary test confirmed the relation of bed height to pressure drop in bed and the stabilization effect of the immersed tubes. The heeling and rolling test cleared that heeling had some effects on the pressure drop distribution in bed but the effect of rolling on the pressure drop distribution was insignificant. The effect of heeling and rolling on the bed behaviour was studied for variable heeling angle and variable frequency.
With the oil fired test bed, various parameters including the temperature distribution in bed, the heat transfer rate to immersed tubes, reduction rate of NOx emission by the two-stage combustion method, desulfurization performance with lime stone and so forth were measured and analyzed.
