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      • Assessment of irrigation requirements for upland crops using soil moisture model under climate change in Afghanistan

        ( Bernard Baiden ),( Seong-gu Hong ) 한국농공학회 2018 한국농공학회 학술대회초록집 Vol.2018 No.-

        This experiment is being conducted to investigate the reaction effects and syngas compositions when steam is used as the gasification agent from a biomass (charcoal) fuel source in a batch-type downdraft gasifier. The aim is to find out the influence of steam and/or air on the composition of syngas and reaction temperatures, calorific values and cold gas efficiencies in a charcoal gasification. The main experimental setup consists of a gasifier, cooling system, gas cleaning filter medium and air and steam supply equipment. Thermocouples are installed at vantage points on gasifier to measure the temperature profile and gas analyser also installed to measure the syngas composition (CO2, H2, CO and CH4). Steam supply for the gasification are supplied intermittently at 10s, 20s 30s, 40s, 50s, 60s in every 10 minutes interval. In the results it is expected that, syngas which is basically hydrogen (H2) and carbon-monoxide (CO) to increase. Because steam have hydrogen and oxygen molecules, therefore the hydrogen gas (H2) is expected to increase and carbon-monoxide decrease. The extent to which the increase or decrease would occur will depend on the length of steam input. Again, steam supply is also expected to reduce the reaction temperatures. If the hydrogen is increased as anticipated, then the calorific values and cold gas efficiency would increase. This study would show that steam supplied as gasification agent increases syngas production, calorific value, gas efficiency and decreases reaction temperatures. These findings are good steps in finding alternative clean energy source utilization. Charcoal biomass produce relatively no tar and cleaning is very easy. It is therefore recommended as a good gasification fuel source.

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