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production of 32 cubic meters per day, with a net energy production of 36 kwhr/day. In February 2003, hourly usage averaged 3.7 hours at a setting of 20 kW. The resultant biogas production averaged 34 cubic meters, and produced a net energy production of 47.0 kwhr/day. The change from 15 kW to 20 kW between January and February 2003, and the resultant increase in net kwhr/day, shows a more efficient utilization of the biogas. During the first week of March 2003, it was discovered that the biogas pipeline was partially blocked by a dirty flame check. This blockage was subsequently removed, and as a result, the hourly usage, the biogas consumption, and kwhrs production increased dramatically to over 15 hours/day, over 127 cubic meters/day, and 143 kwhrs/day, respectively. These performance figures compare favorably with the baseline gas production reported in Table 1. To measure exhaust emissions from the microturbine, tests were run on August 16, 2002 when the microturbine was set at 25kW power output. Table 3 summarizes these test results along with performance data at 15 kW and 20 kW power settings. Table 3. Microturbine Performance at 3 Different Power Settings and Emissions at 25 KW Microturbine Power Setting Hours of Operation Biogas @57% Methane Microturbine Efficiency Exhaust Emissions NOx CO 15 kW 4.15 hrs 59 m3 20% 20 kW 4.5 73 m3 23% 25 kW 4.34 82 m3 25% 3 ppm 200 ppm 3.3 ENERGY AND ENVIRONMENTAL BENEFITS The overall goal of this project is to recover as much energy as possible from the waste of the dairy cows and re-incorporate that energy back into the Cal Poly electrical grid for the benefit of the dairy. Cal Poly’s dairy produces a monthly electric bill of almost $3,000, which results in a yearly expenditure of nearly $35,000. When the Microturbine Electric Generation System is operating at its optimal performance rate, the predicted energy production of the microturbine system is just over 52,000 kWh per year. This energy, at a rate of $0.12 per kWh, is worth about $6,240 which is about 18% of the dairy’s yearly energy costs. 7PDF Image | Biogas Production From A Covered Lagoon Digester And Utilization In A Microturbine
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