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3.2 OPERATING CHARACTERISTICS AND FIELD TESTING The following section describes the microturbine performance from July 1, 2002 through March 2003. Table 2 summarizes the results of this testing, showing biogas utilized, microturbine kilowatt setting, and kilowatt-hours generated. The data can be divided into roughly 1-month periods, during which times the microturbine power setting was maintained at specific KW levels. During the first part of July 2002, when the power was set at 15 KW, the average daily running time was 3.6 hours, the biogas consumption was 44 cubic meters per day, and the net electrical output was just over 28 kwhrs. When the power setting was increased to 20 KW later in July, the daily running time dropped slightly to 3.4 hours, the biogas consumption increased to almost 54 cubic meters per day, and the net kwhrs increased dramatically to 47 kwhrs per day. When the setting was raised to 25 KW, the average daily running time dropped dramatically to 2.4 hours, accompanied by a drop in biogas consumption to 38 cubic meters per day and a net electrical production of only 31 kwhrs per day. The microturbine was then reset to 15 KW, and the resulting daily hours, biogas, and net electricity were only 1.6 hours, 22 cubic feet and 14 kwhrs respectively. In comparison with the baseline parameters in Table 1, where over 100 cubic meters per day were reported, the biogas production after July 2002 was markedly lower. Reasons for this change are addressed later in this section of the paper. Table 2. Microturbine Performance Summary Hours/Day of Operation Ave. KW Microturbine setting m3/day Biogas Kwhrs/day Net Energy Time Period July 1-9, 2002 July 25-Aug 8, 2002 Aug 9-18, 2002 Aug19-Sept 19, 2002 October 2002 November 2002 December 2002 January 2003 February 2003 March 2003 3.6 15 44 28. 3.4 20 54 47. 2.4 25 38 31 1.6 15 22 14. 1.4 15 13 12 1.6 15 20 14 2.7 15 29 25 4.0 15 32 36 3.7 20 34 47 15 15 127 143 5PDF Image | Biogas Production From A Covered Lagoon Digester And Utilization In A Microturbine
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