Biomass resources characterization and biofuels CLAUDIA BASSANO Renewable

Biomass resources characterization and biofuels CLAUDIA BASSANO Renewable Sources and Innovative Energetic Cycles C. R. CASACCIA – Via Anguillarese, 301 00060 S. MARIA DI GALERIA ROMA TEL. + 39 06 30484042 FAX +39 06 30486486 E-Mail: claudia. bassano@alice. it

CONTENTS Biomass resources characterization and biofuels - What is biomass? - Biomass resources - Biomass characterization - Biofuels types - Solid biofuels pellets

What is biomass? Any organic matter whic is available on a renewable or recurring basis, including agricultural crops and trees, wood and wood residues, plants (including aquatic plants), grasses, animal residues, municipal residues. Biomass is produced from water and CO 2 by photosynthesis. 3

Photosynthesis 4

Renewable energy source Climate neutral 5

structural components 50% polymers of sugars ethanol 40 % 6

Biomass Resources Forest Wood Residues Agricultural Residues Forest residue Mill waste Urban wood waste Corn Stover Rice hulls Sugarcane bagasse Animal biosolids Energy Crops Hybrid poplar Switchgrass Willow 7 Fonte:

Forest Wood Residues Forest Residues The primary forestry residues include: logging residues from conventional harvest operations, forest management and land cleaning. 8

Forest Wood Residues Mill Waste Secondary forestry residues mill wastes pulping liquors. Urban wood waste Tertiary forest residues : construction and demolition debris, unusable pallets, tree trimmings from the urban environment 9

Agricultural Residues Agriculture crop residues include stalks and leaves, not harvested or removed from the fields. corn Examples include : corn stover, wheat straw, rice straw, soybeans straw, sugarcane agricultural tree crops (vineyards, olive and fruit groves) Animal residues Agro-industrial residues of food processing industry Waste stream: rice husks, molasses & bagasse, residues from palm oil mills 10

Agricultural Residues Animal Wastes From farms and animal processing operations Complex source of organic materials, environmental consequences anaerobic biodigestion bacteria biological process BIOGAS 11

Energy crops Crops used for energy purposes Herbaceous Annual Perennials Rapeseed, Sunflower, Beet, Sorghum Miscanthus, Cardoon ecc. Woody Short Rotation Forestry 12 Cardoon

Energy crops Herbaceous Energy crops Switchgrass Herbaceous energy crops are: annual (cut annually and re-sown each year) perennials Cardoon Rapeseed Sorghum 13

Energy crops Herbaceous Energy crops Product: SUGAR CROPS Sorghum, sugar cane, sugar-beet bioethanol Sorghum Rapeseed OILY CROPS Rapeseed, sunflower, soybean biodiesel 14

Herbaceous Energy crops yields Yield is the quantity of biomass you can have from one hectare of land The choice of the appropriate location is the most important factor driving the biomass yields of the grasses Switchgrass yields by region Miscanthus yields by region 15

Herbaceous Energy crops Miscanthus and switchgrass are particularly interesting for the following reasons: their high biomass yield potential the concentration of the yield in one harvest, and delayed harvest is possible their persistence and yield stability their efficient use of resources and low input demand the benefits of their rhizome systems. 16

Energy crops Short Rotation Forestry Short rotation forestry (SRF) are selected, fastgrowing, tree species, such as willow, poplar and eucalyptus Harvested within 3 to 10 years of planting. Trees are planted very densely Poplar Willows 6 -12000 per ha 10 -12, 000 per ha 17

Woody Energy crops 18

Woody Energy crops Short Rotation Forestry 19 Sources: Mc. Kendry (2002); Venturi, Piero and Venturi, Gianpietro (2003). Analysis of energy comparison for crops in European agricultural systems. Biomass and Bioenergy, 25, 235 – 255.

Energy crops benefits Environmental benefits Marginal land recovery protecting the land (improve soil quality) erosion control less fertilizer, pesticide, herbicide, and fungicide than annual row crops to purify polluted soils. (phytoremediation) sequestration of CO 2; Economical benefits income benefits for farmers positive effects on local employment in rural areas for the biomass resource production 20

Energy crops disadvantages bioenergy activity requires very deep knowledge of wide sectoral competence High level of mechanization Water, soil, climatic, environmental constraints limiting the biomass productivity and the type of plants Energy crops are less competitive future: higher yields at lower costs Need to adopt horizontal and vertical integration of sub-systems to improve the economic basis of bioenergy complexes 21

Energy crops Future expansion of the biomass power market The development of SRF for renewable energy production is a new sector with potential for considerable expansion, offering benefits for growers, developers, consumers, local communities and the environment. Research are productivity focused on increase yield The SRF represent one of the point on the future expansion of the biomass power market require the development of a feedstock supply system based on large-scale and sure production of 22 biomass fuel.

Biomass characterization The biomass forms the basis of any Bioenergy application and often the physic, chemical characteristics of the fuel also define the type of technology to be used. Characteristics affecting the properties of wood as a fuel: heating value, chemical composition, moisture content, density, hardness, the amount of volatile matters, the amount of solid carbon, ash 23

Biomass characterization Heating value. energy that is available from burning a substance High heating value (HHV) Low heating value (LHV) Value used 24

Biomass characterization Low heating value. 25

Biomass characterization Volume (m³) required to substitute one cubic meter of oil by some other fuels 1 thermal MW store a volume of 6. 000 cubic meter of coal store 36. 000 cubic meter, which means a quantity six more 26

Biomass characterization Chemical composition DRY MATTER ASH 0, 40, 6 %of dm weight SOLID CARBON 11, 4 -20 % of dm weight VOLATILE MATTER 84 -88 % of dm weight proximate analysis WATER Average moisture content of the total weight Bark, Saw dust Forest chips Wood pellets 55 -60 % 40 % 8 -12 % 27

Biomass characterization Chemical composition ultimate analysis C 35 -50 % H 2 O H 6 - 6, 5 % CO 2 O 38 -42 % NO 2 N 0, 1 -0, 5 % S 0, 05 % Combustion SO 2 ash 28

Biomass characterization 29

Biomass characterization Ash The ash composition and the ash melting behaviour should be taken into consideration to avoid slagging problems in boiler. The melting behaviour of straw and energy crops (Miscanthus) is in a range of 600 - 950°C Normal wood do not start melting before 1100°C. 30

Biomass characterization Ash 31 Source: Biomass Resource Assessment and Utilization Options for Three Counties in Eastern Oregon Department of Energy December 2003

Biomass characterization Moisture content is an important characteristic affecting the quality of biomass fuel for thermal processes like combustion, gasification and pyrolysis. 32

Biomass characterization Moisture: influence design plant, direct cost factor, influence the price of fuel. the more water fuel contains then lower heating value then fuel efficiency is lower the more water fuel contains then bigger boiler volume needed then more expensive boiler In combustion processes, high moisture content can lead to incomplete combustion, low thermal efficiency, low flame temperatures, excessive emissions and the formation of tars that could cause slagging problems. lower moisture content cost less to transport and can reduce the size of handling, processing and energy conversion equipment 33

Biomass energy chains Main biomass energy chains : Wood energy chain the use of dry products (cellulosic crops and residues) for thermochemical conversion (combustion, gasification, pyrolysis); Liquid biofuel chain the use of crops (oilseed rape, sunflower, sugar beet, cereals etc. ) for liquid biofuel production; Ethanol (sugar crops) Biodiesel (oil crops) Biogas the use of wet products for anaerobic digestion. 34

Biomass energy chains 35

Biofuels types Biomass low energy density transport problem expensive Biofuels Fuel produced directly or indirectly from biomass or from their processing and conversion derivatives Solid biofuel Chips Pellets Electricity and heat production briquettes Liquid biofuel transport biodiesel bioethanol

Biofuels Main advantages of biofuels: increase the energetic value to lower the volume for storage to facilitate the handling, transportation and to lower its costs to increase the energy density to volume ratio to eliminate the loss of material caused to fermentation 37

Biofuels chips wood chips chipped woody biomass has the form of pieces with a defined particle size produced by mechanical treatment typical length 3 -5 cm Moisture 30 -40 % Density 200 -300 kg/m 3 LHV 10 -13, 4 MJ/kg 3 -3, 6 k. Wh/kg 750 k. Wh/m 3 Cost 40 - 80 €/t 38

Biofuels pellet Wood pellets are densified wood fuels which have been produced from sawdust, grinding dust, shavings, bark, herbaceous biomass, fruit biomass, or biomass blends and mixtures. etc. typical length 5 to 30 mm Moisture 8 -12 % Density 650 -700 kg/m 3 LHV 17 MJ/kg Cost 150 -200 €/t 4, 7 k. Wh/kg 3080 k. Wh/m 3 39

The pellets production pellet production process Storing and pretreatment Drying the raw material Pellet cooling Pellet storing 40 Source : Refined Bio-Fuels Pellets and Briquettes Characteristics, uses and recent innovative production technologies

The pellets production 1. raw materials are fed into pellet cavity 2. Rotation of die and roller pressure forces materials through die, compressing them into pellets 3. Pellets extruded to the outside of the die 41

The pellets advantages Advantages of wood fuel: Less volume Fewer deliveries Consistent size and moisture content Less ash and emissions Pellets are dry and can be stored without degrading 42

The pellets disadvantages Advantages of wood fuel: Disadvantages of wood fuel: Flow like a liquid Need large storage place Easier to handle Ashes Easier to ignite More expensive Pellets stove 43

Biofuels chips and pellets 1 kg of chips whit moisture 40 % LHW=10, 46 MJ/kg is equivalent : 0, 28 litre oil (LHWoil =10, 19 k. Wh/ litre) 0, 3 m 3 CH 4 (PCI CH 4 =9, 5 k. Wh/Nm 3) 1 kg of pellet LHW=16, 92 MJ/kg is equivalent : 0, 46 litre oil 0, 49 m 3 of CH 4 Confront Chips process simpler and cheaper Chips lower energy density, lower volumetric bulk density, more storage space 44

Biomass resources characterization and biofuels Conclusion Biomass has different origines Energy crops : future expansion of the biomass power market. Low energy density biofuels, transport problem Pellets solid biofuel: expansion market in Europe 45

Biomass resources characterization and biofuels GOODBYE Claudia Bassano claudia. bassano@alice. it 46