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CHP with AD at Scottish farm
A new combined heat and power (CHP) plant is helping John Rennie & Sons (Farmers) both to deal with bio-wastes and generate renewable electricity, most of which will be exported to the national grid. Built by Wolf Power Systems, the CHP plant has a generation capacity of 550 kW.
An anaerobic digestion (AD) plant had been operational at the Gask Farm site in Turriff, Aberdeenshire site for 10 years, using about 15,000 tonnes of feedstock – mostly food waste and abattoir material, with some of the farm’s own pig slurry as well. The AD process produces 67% methane and 32% carbon dioxide. The new CHP plant will run on the biogas from the AD plant; around 50 kW of the electrical output is used to run the on-site facility.
Heat from the CHP plant is used to keep the digester at a constant 40°C, and by an on-site pasteurisation plant, which heats up the digestate to over 70°C and thereby kills any pathogens. The digestate can then replace mineral fertilisers.
Photo: Wolf Power Systems
News Item details
Journal title: Energy World
Subjects: Engineering, Electricity generation, Combined heat and power generation, Refinery feedstock, Fertilisers, Renewables, Methane, Carbon emissions, Carbon dioxide
