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DEN DULK DAIRY DIGESTERS Captured methane gas from digesters cleanly fuels Capstone microturbines. The microturbines create on-site power and thermal energy while reducing greenhouse-gas emissions. RAVENNA, MICHIGAN For two years, the den Dulk Dairy has converted manure from 1,000 of its cows into 30kW of clean, green electricity produced by a Capstone microturbine. In addition, heat from the process is reused to heat the farm’s 700-square-foot concrete liquid/solid separator building. The manure first is pumped through an external heat exchanger that heats the material to 100 degrees Fahrenheit, then sends it to a 47 foot tall, 48 foot wide “dairy digester” tank. The external heat exchanger actually runs off a portion of the biogas created by the process. Because Capstone microturbines can run on a variety of fuel types – from liquid natural gas to diesel fuel to methane, they were the natural choice to create electricity from the waste gas. The Capstone microturbine produces 45kW of thermal heat. Previously waste from den Dulk, which is home to 3,000 cows and produces 155 million pounds of manure a year, was stored onsite and eventually spread on farm fields across West Michigan. Environmentalists and state regulators say such storage practices cause environmental problems with runoff into rivers and streams. Waste methane gas from the 47 foot tall anaerobic digester fuels a Capstone microturbine that produces 30kW of clean, green electricity and 45kW of thermal energy used for building heat.PDF Image | Capstone’s global presence
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