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Systems for Using Low Cost or Waste Heating for Digester Heating

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  034166,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.15326)
Authors:   Dan Paquin, P.E., Tung Liang
Keywords:   Methane fermentation, low cost, direct contact, heating, exhaust, gas, biogas

Devices that use biogas and waste heat sources for heating digesters reduce costs. Using exhaust energy from direct firing and other fuel burning devices can reduce operational and capital outlays for anaerobic systems. A commercial propane torch direct fired heating device was tested with low cost blowers. A 20,000 liter HDPE water tank simulated a digester. Both LPG and artificially mixed biogas was used. System efficiency of the hot exhaust gas discharge system was reported in terms of the amount of fuel energy that was used to heat the digester. Fuel pressures require for combustion are related to heating air flow rates.

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