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Effectiveness of briquetting bio mass materials with different ratios in 10 kW down draft gasifier

Author(s): K.Sivakumar | B. Sivaraman | N.Krishna Mohan

Journal: International Journal of Engineering Science and Technology
ISSN 0975-5462

Volume: 3;
Issue: 11;
Start page: 7959;
Date: 2011;
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Keywords: Briquette saw dust | cow dung biomass | gasification | producer gas | binding material | combustion | air flow rate | pressure drop | thermal efficiency.

This paper discuss about the effectiveness of using Briquetting of rural bio mass material in Down draft gasifier for easy operation and power generation, during winter and rainy season. Sawdust a milling residue is available in huge quantity. Apart from the problems of transportation, storage, and handling, the direct burning of loosesaw dust biomass in conventional grates is associated with very low thermal efficiency and widespread air pollution. The conversion efficiency is as low as 40% with particulate emissions in the flue gases in excess of 3000 mg/ Nm. In addition, a large percentage of unburnt carbonaceous ash has to be disposed off. Briquetting ofthe sawdust with cow dung could mitigate these pollution problems while at the same time making use of the important domestic energy resources. The easily available rural bio mass material saw dust and rurally available binder material cum bio mass cow dung is used for briquetting. This experiment was carried out with briquetting of saw dust and binder cow dung at different ratio. It is experimentally investigated at 8000C using gasification technique in a downdraft gasifier. The air flow rate and pressure drop across the gasifier has been measured. The percentage of combustible gases like H2, CO, CH4, CO2, and N2 formed during gasification are found. The calorific value of the producer gas for different ratio of briquetting biomass material has been found out. Experimental results indicate that briquetting at 75:25 ratio of sawdust and cow dung is the best suitable biomass Briquette for gasifier compared to the other two ratios considered. The result shows that the gas composition of methane is comparably high in this ratio (i.e. 75:25) than other two ratios i.e.(50:50) and (25:75). The results also show that pressure drop across the gasifier and producer gas composition increases withincrease in air flow rate. Also found that, thermal efficiency is comparatively high at 75:25 ratio briquettes than other two ratios and it increases with air flow rate.

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