EML4450L24

EML4450L24 - S ustainable E nergy S cience and E ngineering...

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Unformatted text preview: S ustainable E nergy S cience and E ngineering C enter Biomass for Energy and Fuel Reference: Donald L. Klass, Biomass for Renewable Energy, Fuels and Chemicals, Academic Press, 1998. http://www.energy.kth.se/compedu/webcompedu/media/Lectu re_notes/S1B11C2.pdf http://www.energy.kth.se/compedu/webcompedu/media/Lectu re_notes/BiomassCombustionStudyPack.pdf S ustainable E nergy S cience and E ngineering C enter Bioenergy is energy derived from biomass. Biomass is all organic material being either: The direct product of photosynthesis (for example plant matter such as leaves, stems, etc.) The indirect product of photosynthesis (for example animal mass resulting from the consumption of plant material). The photosynthesis process uses solar energy to combine carbon dioxide from the atmosphere with water (and various nutrients) from the soil to produce plant matter (biomass). The carbon dioxide (CO 2 ) emitted on combustion of biomass is taken up by new plant growth, resulting in zero net emissions of CO 2 . However, it should be remembered that there are some net C0 2 emissions associated with bioenergy when looked at on a life-cycle basis emissions from fossil fuels used in the cultivation, harvesting and transport of the biomass. These are generally small compared to the CO 2 avoided by displacing fossil fuels with energy from biomass. Consequently, bioenergy is a renewable energy resource with the added benefit of being CO 2 neutral. ( ) 2 2 2 2 O O CH l chlorophyl light O H CO + + + + Bioenergy S ustainable E nergy S cience and E ngineering C enter Biomass Energy Biomass resources are potentially the world's largest and most sustainable energy source The annual bio-energy potential is about 2900 EJ, though only 270 EJ could be considered available on a sustainable basis and at competitive prices. The expected increase of biomass energy, particularly in its modern forms, could have a significant impact not only in the energy sector, but also in the drive to modernize agriculture, and on rural development. The share of biomass in the total final energy demand is between 7% and 27%. Source: http://www.worldenergy.org/wec-geis/ S ustainable E nergy S cience and E ngineering C enter Biomass Definitions Organic material mainly composed of carbohydrate and lignin compounds, the building blocks of which are the elements carbon, hydrogen and oxygen. Carbohydrates consist of sugars, starches, and cellulose , which contain CHO and function primarily as energy storage, energy transport and plant structure. Cellulose (C 6 H 10 O 5 ) n is a long-chain polymer polysaccharide carbohydrate, of beta- glucose. It forms the primary structural component of plants and is not digestible by humans....
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This note was uploaded on 10/22/2011 for the course EML 4450 taught by Professor Greska during the Fall '06 term at FSU.

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EML4450L24 - S ustainable E nergy S cience and E ngineering...

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