Delivery of biogas/RNG to Calgren's receiving facility.
Digester gas produced from cow manure at local dairy farms is processed at the dairy sites into desulfurized and compressed (3,600 psig) biogas fuel. At some dairies, the CO2 is removed from the biogas resulting in a pipeline quality renewable natural gas (RNG). The biogas, containing about 40% CO2, is used for low-BTU duct-firing of a heat recovery steam generator. The RNG, at >98% methane, is injected into the local utility pipeline.
Depending on the dairy source, the 3,600 psig biogas and RNG are trucked to Calgren's receiving station, where they are decompressed to 60 psig (duct-firing) or 450 psig (for injection into the utility pipeline). PID was responsible for the design of the piping system, specification of components (including heaters, regulators, instruments and control valves) and layout for use in facility construction. The facility came on stream in 2020.
Calgren Dairy Fuels Biogas Plant Piping
The Calgren Dairy Fuels Biogas Plant collects manure-derived digester gas from local dairies. The biogas is conveyed through an underground piping network to the plant site where it is desulfurized, compressed and used as fuel for an onsite gas turbine and duct burner. Some of the biogas is rendered pipeline quality by removing the CO2, further compressed and injected into the local utility pipeline. PID was responsible for the piping design, layout, stress analysis and development of construction drawings for the piping installation. The plant came on-stream in 2018.
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