Question

How more heat and more thermal efficiency is obtained in the biomass gas stove?

Answer 1

Conventional biomass stoves, which currently use direct combustion of biomass pellets or briquettes, have still a problem of emitting much higher CO gas emission compared to LPG stoves at the level of 100's ppm,. These values are well above the minimum allowable CO gas emission of 25 ppm and therefore the emission is not safe for the stove users. In this research, a biomass-gas stove was designed using a method of top-lit updraft gasification where the combustion of pyrolysis gas evolving from the bed of rubber wood pellets by adding secondary air occurs at the top of the stove. The primary air is delivered upward the bed, while the secondary air flows through the annulus of the stove and bends horizontally towards a series of holes at the top of the stove. This research has an objective to obtain optimum value of flowrate ratio of the secondary air to the primary air (air flow ratio) where the stove produces minimum emission of CO and maximum thermal efficiency. The ratio was varied at 2.44, 6.29, 13.43, and 20.6. This work concluded that the lowest CO emission and the highest average flame temperature occur at the air flow ratio of 6.29, while the highest thermal efficiency at 2.44.
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riya1604