Abstract:
The objective of this thesis is to examine the impact of two variables on flame temperature, burning velocity and volume of flue gas from a pulverized cassava flour combustion. The first variable is stabilizing the mass flow rate of pulverized cassava flour and the primary air. The second variable is varying the volume of the secondary air. Two types of burner, premixed burner and diffusion burner 1 were tested in this stud. A guide vane installed inside the wall of diffusion burner is designed to swirl the secondary air to make better combustion and flame stabilization. Three different sizes of burner nozzles (76.2, 89.0 and 101.6 mm. diameter) were also tested. It was found that the equivalence ratio at 1.65-1.75 yielded not only the highest flame temperature and burning velocity 1 but also the minimum volume of flue gas. This resulted in the improved combustion process. The result of the experiment shows that the premixed burner operated more efficiently than did the diffusion burner. That is, The premixed burner gave higher flame temperature and burning velocity. At the equivalence ratio of 1.7 or more, the combustion from the premixed burner is better than that from the diffusion burner. The test of different sizes of burner nozzle reveals that the 89 mm diameter burner nozzle resulted in the highest flame temperature and velocity. Some errors due to the tools and equipment used in the experiment may be found in this study. Calibrating the pulverized cassava flour may have some small mistake since the weighting scale is quite large. The varying of pressure of compressed air were not constant at all times and hence may result in small discontinuous flows of both primary air and pulverized cassava flour. Some Errors in analyzing the flue gas were also acknowledged.