Bio-ethanol CO 2 reduction For Mauritius
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1 Workshop on Global Fuel Economy Initiative 22 & 23 July 2013, Maritim Hotel, Balaclava Bio-ethanol CO 2 reduction For Mauritius Abdel Khoodaruth Mechanical and Production Engineering Department, University of Mauritius 1
2 Overview Introduction Ethanol production stages Carbon Dioxide emissions of ethanol pathways Implications Conclusion 2
3 Introduction Global warming is a major component in the energy scenario of many countries Policy makers are facing a growing need to reduce CO 2 Bio-ethanol is produced from biomass and is suitable for use as fuel in motor-vehicles Ethanol can be produced from corn, sugarcane, and maize Sugar cane ethanol is being promoted as an important component of global energy and climate change mitigation policy Sugar cane ethanol(molasses or cane juice) 3
4 Bio-Ethanol Clear advantages over gasoline in reducing greenhouse gases emissions and improving air quality Substitute for automotive fuel Although ethanol has lower energy content than conventional gasoline, its higher octane value results in higher compression ratios and consequently more efficient thermodynamic operation in internal combustion engines(nguyen et al, 2007). Very low emissions of ozone-forming hydrocarbons and toxics Made from renewable sources Can be domestically produced 4
5 Sugar cane in Mauritius Mauritius is a small island of 1865km 2 Agriculture accounts 43% of land use and sugar cultivation represents 38.6%. 90% of agriculture land is under sugar cultivation Sugar cultivation and production has contributed significantly to the socio-economic progress for more than a century By-product of sugar cultivation=sugar, bagasse and molasses 5
6 Sugarcane production statistics Area harvested (ha) 66,732 65,259 62,024 60,380 58,709 56,668 Cane production (000tonnes) 4,749 4,236 4,533 4,667 4,366 4,230 Molasses(tonnes) Source: Statistics Mauritius: Digest of Agricultural Statistics. October
7 CO 2 emissions - Mauritius 5% 0% 25% 9% 61% Energy industries (electricity) Manufacturing industries Transport Other sectors Industrial processes Source: Statistics Mauritius: Digest of Environmental Statistics. December
8 The Issue evaluating ethanol CO 2 emissions when producing sugar cane ethanol Quantify the CO 2 emissions in the ethanol production pathways 8
9 Ethanol production stages(molasses) Fertiliser and herbicide production transport Fossil fuel Cane Cultivation and Harvest transport Sugar Processing and Electricity Generation Sugar Electricity Molasses 9 Bio-fuel transport Ethanol transport
10 Ethanol production stages(sugar juice) Fertiliser and herbicide production transport Fossil fuel Cane Cultivation and Harvest transport Sugarcane Processing Electricity Ethanol transport 10 Bio-fuel
11 Transportation from harbour to factory 11
12 Parameters Area harvested(2011) Sugar cane(tonne) tonne of molasses 215 L of ethanol 1 tonne of sugar cane 86 Litres of ethanol Functional Unit 1 litre of ethanol, 1 tonne of sugar cane 12
13 Calculations Area harvested(2011) Sugar cane(tonne) Molasses(tonne) Ethanol production(ml) molasses Ethanol production(ml) Sugar cane juice
14 CO 2 emissions of ethanol pathways 14 CO 2 kg per tonne of sugar cane Production of fertilisers Production of herbicide Transportation of fertilisers Transportation of herbicide Farming and cultivation Irrigation Harvesting Loading of cane Transportation of sugar cane to factory Sub-total Ethanol conversion Transportation of ethanol to admixture plant Total CO 2 kg per litre of ethanol
15 CO 2 emissions of ethanol pathways(%) 5% 7% Production of fertilisers 16% 39% Production of herbicide Transportation of fertilisers Transportation of herbicide 6% 3% 2% 11% 10% Farming and cultivation Irrigation Harvesting Loading of cane Transportation of sugar cane to factory Ethanol conversion Transportation of ethanol to admixture plant 0% 1% Transport = 24% 15
16 Implications To produce one litre of anhydrous ethanol, 242.2g of CO 2 emitted one litre of gasoline emits 2325g of CO 2 Blend of gasoline and anhydrous ethanol is now being used and is even considered mandatory in many countries such as Brazil, United States and Europe E-10 means 90% gasoline and 10% ethanol E-10: no modification in engine 16
17 Implications One litre of E10 = litres of gasoline* One litre E20 = litres of gasoline* One litre of E85 = litres of gasoline* E10, E20 and E85, will cause an over consumption of 3.4%, 6.95% and 37.9% respectively. To replace one litre of gasoline, we need more than one litre of ethanol This is because ethanol has a lower calorific value * Source: Bell et al. (2011) 17
18 Implications 152 ML of gasoline = tonnes of CO 2 E10: 15.7 ML of ethanol ML of gasoline = of CO 2 = tonnes of CO 2 E85: ML of ethanol ML of gasoline = of CO 2 = tonnes of CO 2 18
19 Conclusion Ethanol production = g of CO 2 Gasoline to E10 = tonnes of CO 2 More in case of higher proportion of ethanol blended with gasoline Price structure The potential reduction of CO 2 emissions is one of the sustainability indicators which can be used to bridge the gap between economic competiveness and environmental benefits. 19
20 20 Thank you!!
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