13.3.2.1 Operation of RCF Facility

Tables 13.2 and 13.3 show the results of refining testing. The average electrical energy consumed by the RCF facility during the testing period was 5.5 kWh. Using the RCF facility, about 44 % of the raw biogas (216.0 Nm3/days) was refined to methane (96.0 Nm3). To increase the methane concentration of the biogas after purification to about 94.5 % and to standardize the caloric content, about 0.5 % propane (1.0 Nm3) was added. This resulted in refined gas (97.0 Nm3) with a caloric content of 9,290 kcal/Nm3 (38.9 MJ/m3).

The gas at the final refining process had a WI of 49.3 and maximum combustion potential (MCP) of 34.3 m/s. These values are the minimum requirement within the specifications of town gas (WI: 49.2-53.8; MCP, 34-47 m/s). In addition, though the amount of raw gas produced per day was 216.0 Nm3, the amount of refined gas was

97.0 Nm3, which satisfied the condition set by the High-Pressure Gas Safety Act of less than 100 Nm3 per day for Class 2 producers.