<p>Abstract</p><p>The dependency of fossil fuels in the transport sector causes large emissions of carbon</p><p>dioxide. This problem can we reduce by using vehicle gas from digested solid manure and left</p><p>over of pasture. I have studied the potential for this in the county of Västernorrland. The</p><p>purpose is to investigate how much vehicle gas that can be extracted.</p><p>One central, large scale digestion and upgrade plant should be placed in Härnösand. The</p><p>amount of pasture and manure that is economical and practical available is enough to produce</p><p>2,7-3,5 millions Nm3 vehicle gas. It corresponds to 1 800- 2 400 cars, each driving 17 860 km</p><p>per year.</p><p>The heating value of the vehicle gas is 26-34 GWh. To extract this energy you have to supply</p><p>energy corresponding to a heating value of 4,9 GWh for transport of raw material and</p><p>digested sludge together with 13-14 GWh for process heat and electricity.</p><p>If the gas replaces petrol the emissions from the lifecycle of the fuel decrease with 5 600-7</p><p>400 ton CO2-equivalents. The emissions by the vehicle decreases with 640-840 kg NOx, the</p><p>emissions of hydrocarbon increases with 60-80 kg and the emissions of particles remains the</p><p>same.</p><p>The increased content of easy available nitrogen is about 40 tons, it can replace about 5 % of</p><p>the nitrogen supplied as synthetic fertilizer. The contribution to the nitrogen resource by</p><p>digested sludge is greater than its contribution to the supply of fuel.</p><p>The cost for the gas is 12-14 kr per petrol equivalent, that is little more than the today’s price</p><p>of petrol of 11,28-12,24 kr. Above all, it is the cost of transport that cause the high cost.</p>
Identifer | oai:union.ndltd.org:UPSALLA/oai:DiVA.org:miun-11621 |
Date | January 2009 |
Creators | Norgren, Robert |
Publisher | Mid Sweden University, Department of Engineering and Sustainable Development |
Source Sets | DiVA Archive at Upsalla University |
Language | Swedish |
Detected Language | English |
Type | Student thesis, text |
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