Investigative Study for Low Particulate Matter Emission in Rice Husk Combustion
Emmanuel Owoicho ABAH, Tofael AHAMED, Ryozo NOGUCHI
Biomass combustion is one of the major sources of particulate matter (PM) emission, which forms a crucial part of air pollution. This study investigated the effects of particle size of rice husk and bran impurities on the emission trend of PM2.5. Rice husk from the Koshihikari variety, Oryza sativa was prepared into 3.00 g as rice husk samples from Japan (JPN). JPN had no bran impurities and consisted of normal sized Japonica husk particles (4.00 – 5.50 mm). Rice husk from the Nerica rice variety (a hybrid of O. sativa and O. glaberima) was imported and was prepared into 3.00 g as Nerica rice husk samples from Nigeria (NGR). The samples were smooth rice husk particles (0.10 – 2.00 mm) and had bran impurities. Rice husk briquette was made from JPN samples without a binding material, was prepared into 3.00 g as rice husk briquette (RB) sample. Three samples were combusted in temperatures between 600 °C and 1000 °C for a 3 minutes duration. The experimental set up comprised a Yamato F100 fixed bed electric furnace, Dust Track II aerosol analyzer and Testo 350 flue gas analyzer. Higher PM2.5 emission (32.4 mg/g) was recorded for the combustion of RB at 700 °C compared to that of NGR husk (23.7 mg/g) at 800 °C, and JPN (13.6 mg/g) at 900 °C. That is because, RB had a lower surface area and pore volume, which affected its air-fuel mixing during the combustion phases. JPN emitted higher carbon monoxide (1592.4 ppmv) due to higher Sulphur content (0.2wt%db). That caused additional competition for oxygen in the oxidation process of Sulphur from SO2 emission.
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