Experimental study of burning rice husk with different sizes in a vortex combustor
2002
Visanuchai Duangjai(King Mongkut's Institute of Technology Ladkrabang, Bangkok (Thailand). Faculty of Engineering. Department of Mechanical Engineering) | Somsak Phothawilkiat(King Mongkut's Institute of Technology Ladkrabang, Bangkok (Thailand). Faculty of Engineering. Department of Mechanical Engineering) | Niyom Srisirisittikul(King Mongkut's Institute of Technology Ladkrabang, Bangkok (Thailand). Faculty of Engineering. Department of Mechanical Engineering) | Chinaruk Thianpong(King Mongkut's Institute of Technology Ladkrabang, Bangkok (Thailand). Faculty of Engineering. Department of Mechanical Engineering) | Pongjet Promvong(King Mongkut's Institute of Technology Ladkrabang, Bangkok (Thailand). Faculty of Engineering. Department of Mechanical Engineering)
Paper deals with the study of influence of rice husk particle size on combustion characteristics in a vortex combustor. In the present experiment, two sizes of rice husk are employed: 0.18-1.18 mm and 2.0 x 8.0 mm sizes. Experiments are made by adjusting the feeding rate to be 0.20, 0.25 and 0.30 kg/min for each particle size used. For each of the particle feeding rate, the combustion air is varied to let the equivalence ratio, phi, be 0.8, 1.0 and 1.2 in which the ratio of volumetric flow rate of the secondary air to the total air, (lambda), is set to 0,0.15 and 0.25 of each phi. The effect of rice husk sizes on combustion characteristics is investigated at various equivalence ratios, ratios of volumetric flow rate of the secondary air to total air and the fuel feeding rater. The experiment shows the maximum temperature of about1235 deg C in the upper combustion chamber for the rice husk particle size rage of 0.18-1.18 mm, at phi = 1.0, lambda = 0.25 and 0.30 kg/min fuel feeding rate. Besides, the combustor has a high combustion stability with ease of operating control. The emissions of exhaust gas from the stack are composed of O2 = 3.5 percent, CO2 = 6.8 percent and CO = 195 ppm.
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