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  • 1.
    Norgren, Robert
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Fordonsgas ur gödsel och vall2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Abstract

    The dependency of fossil fuels in the transport sector causes large emissions of carbon

    dioxide. This problem can we reduce by using vehicle gas from digested solid manure and left

    over of pasture. I have studied the potential for this in the county of Västernorrland. The

    purpose is to investigate how much vehicle gas that can be extracted.

    One central, large scale digestion and upgrade plant should be placed in Härnösand. The

    amount of pasture and manure that is economical and practical available is enough to produce

    2,7-3,5 millions Nm3 vehicle gas. It corresponds to 1 800- 2 400 cars, each driving 17 860 km

    per year.

    The heating value of the vehicle gas is 26-34 GWh. To extract this energy you have to supply

    energy corresponding to a heating value of 4,9 GWh for transport of raw material and

    digested sludge together with 13-14 GWh for process heat and electricity.

    If the gas replaces petrol the emissions from the lifecycle of the fuel decrease with 5 600-7

    400 ton CO2-equivalents. The emissions by the vehicle decreases with 640-840 kg NOx, the

    emissions of hydrocarbon increases with 60-80 kg and the emissions of particles remains the

    same.

    The increased content of easy available nitrogen is about 40 tons, it can replace about 5 % of

    the nitrogen supplied as synthetic fertilizer. The contribution to the nitrogen resource by

    digested sludge is greater than its contribution to the supply of fuel.

    The cost for the gas is 12-14 kr per petrol equivalent, that is little more than the today’s price

    of petrol of 11,28-12,24 kr. Above all, it is the cost of transport that cause the high cost.

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