Abstract
Some combustion tests f or utilizing oily sludge as f uel were carried out with a 0.5m square sectioned experimental fluidized bed boiler.Almost of all combus-tibles in oily sludge are volatile matters, so a considerable amount of combustibles may leave the bed and burn out in the freeboard.Predicting the amount of combustion in the bed is very important for designing the heat transf er tube immersed in the bed.
This paper presents the effects of some factors which are the fuel feeding, the air ratio, the bed temperature and the bed height, on the in-bed combustion efficiency of oily sludge.
The experimental results drew the conclutions as follows;
(1)The in-bed combustion efficiency is directly proportional to the air ratio, the bed temperature and the bed height.
(2)But it cant be more than 85% within a conventional variation of those factors.
(3)It can be recognized that the bottom feeding system gets to higher in-bed combustion efficiency than the surface feeding.system.
(4)It is important for increasing the in-bed combustion efficiency to promote the mixing rate between volatile products and combustion air in the bed.
