This project is a part of the development of a biomass fluidized bed combustor connected to an industrial steam boiler. The objectives are to study a characteristics of sawdust combustion in a fluidized bed combustor, FBC and study the parameters that affected to combustion efficiency. The combustor was made of 4.5 mm thick steel (0.9 mm in diameter and 3 m high) and insulated with 5 cm thick ceramics fiber. The sand (0.3-0.5 mm diameter) was used as the inert bed material. In the experimental tests, the effects of the excess air, fuel feed rate, sand bed height and moisture content in the fuel combustion characteristics in FBC were investigated. In the tests, the temperature profiles along over the combustor height and the emissions particularly in CO concentration at the combustor stack were measured. The results showed that the parameters, specifically in excess air ratio and moisture content in the fuel, had the effects on the temperature in FBC. The combustion temperature was in the range of 650-900C. The moisture content in sawdust and excess air ratio had strongly effects on the CO concentration at the stack. However, the combustion efficiency was in the high range if the excess air ratio as well as moisture content in the fuel were controlled properly.
By
Songwuthi Decha
Thnabadee Boonvieng
Anupongsa Phromsawarnka
