Converting Waste Agricultural Biomass into a Resource - UNEP

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1 Figure 1. Design of the dryer Detailed Process Description Drying chamber The drying chamber, 1.37m wide, 2m tall and 2.9m long, contains two movable tray carts having 26 trays each. It is made of galvanized iron sheets framed together by angular steel bars. The trays (of dimensions 0.98m x 0.97m) are made of polyethylene plastic mesh reinforced with aluminum bars. The total area of the drying trays can accommodate 200 kg of mango slices. The chamber also has an air distribution nsystem, which ensures distribution of air into the entire height of the chamber. The air distribution system is composed of an axial fan (with a 0.35m dia. rotor) and a distributor duct. The distributor duct has a converging shape from top to bottom, and has thirteen concentric rings of varying diameter, arranged one above the other, at specific spacing. This system can deliver an air volume of up to 0.37 m3/sec. Biomass furnace - Heat exchanger The rice husk-fuelled furnace is composed of five parts: the combustion chamber, heat exchanger system, fuel hopper, air inlet duct, and the chimney. The combustion chamber is made of bricks enclosed in galvanized sheet metal while the heat exchanger system is made of 27 boiler tubes arranged in a rectangular array. All other parts of the furnace are made of galvanized iron sheet. A butterfly valve controlled by a variable speed electric motor (0.5 hp) controls the feed rate of rice husk; the fuel hopper is inclined at 45º (angle of repose of rice husk) to allow free flow of rice husk into the combustion chamber. An auxiliary blower (0.5 hp) was installed in the combustion chamber to supply the primary air required for complete combustion. The primary air supply to the furnace can be controlled by adjusting the opening of the blower air inlet. The main blower installed between the furnace and the drying chamber draws the ambient air through the furnace-heat exchanger unit, and supplies hot air to the drying chamber. An S-shaped duct is installed at the air inlet to the heat exchanger. The mouth of the duct is located away from the combustion chamber to avoid suction of ashes that may otherwise contaminate the product to be dried. The fuel hopper has a capacity of three sacks of rice hull per loading which lasts for about 3 to 4 hours of dryer operation. Investment and Operating Cost The total cost of fabricating this dryer is about US$1,800. Example of Real Life Application For drying agricultural products Research UPLB Philippines Supplier University of the Philippines Los Banos Laguna, Philippines 212
Solar-Biomass Hybrid Tunnel Dryer 101 Thailand, Pilot Demonstration Crop Residue Process Equipment Main Product Biomass Waste Biomass Combustion Solar-Biomass Hybrid Tunnel Dryer Heat for drying Technical Description of Technology This dryer is an adaptation of the tunnel dryer developed at the University of Hohenheim, Germany. The prototype described here is suitable for drying 115 kg of fruits (banana) and has been designed and fabricated at AIT. The dimensions and other design parameters of the AIT solar-biomass hybrid dryer are presented Size of Machine/ Production Capacity Design Details The dryer (Figure 3.1) consists of a flat plate air-heating solar collector, integrated with a drying chamber. A common glazing, provided for both the collector and the drying chamber, forms a tunnel. A biomass stove-heat exchanger assembly is fitted at one end of the tunnel, at the collector side. The biomass stove is used as an alternate heat source for the dryer when solar energy is not available. The integrated collector-dryer unit rests on 101 http://www.retsasia.ait.ac.th/booklets/Dissemination%20Booklets-Phase%20III/Tech%20pack-Drylow%20resl.pdf 213
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Con v e r t i n g Wa s t e Agr i c
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Converting Waste Agricultural Bioma
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setting and identification of stake
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ACRONYMS CO2 CV DAP DTIE ESTs E-Was
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2. Rationale One of the critical ac
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3. Scope and Limitations In compili
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4. The Compendium The Project Websi
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• Basic technology information 9
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Table 1: Cellulosic Waste Biomass C
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Molding Oil Palm fruit residues Sug
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6. Recommendations The specific rec
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2-Drum Top Supported Boiler 12 USA,
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HYBRID PF 14 USA, Commercial Crop R
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operation of each to match the stea
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HYBRID RG 15 USA, Commercial Crop R
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All above work in concert to reduce
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HYBRID UF 16 USA, Commercial Crop R
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operation of each to match the stea
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TRI 17 USA, Commercial Crop Residue
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2-Drum Bottom Supported Boiler 18 U
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power boilers. Examples of Real Lif
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A fully automated continuous system
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Detailed Process Description A. Met
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Examples of Real Life Applications
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Detailed Process Description A. Met
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1. The Fibrowatt operation starts o
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HYBRID CG 21 USA, Commercial Crop R
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utilizing the most reliable system
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BTG Flash Pyrolysis Netherlands, Co
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Before processing organic materials
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a. Reactor : This was a downdraft,
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Price of Machine The total investme
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Main Products: The plant provides i
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Disadvantages to Developing Countri
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Detailed Process Description Kakira
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Example of Real Life Applications C
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Aqueous Phase Reforming (APR) 27 US
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Shelled Corn as Fuel 29 USA, Commer
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Amaizablaze/Nesco, Inc. P. O. Box 3
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HS-Tarm 5 Main Street, P.O. Box 285
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Lock Haven, PA 17745 800-582-4317 h
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P.O. Box 2075, Mankato, MN 56002 80
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The result is wood (biomass) can be
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Biomass Heating System 35 UK, Comme
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Supplier R.D. Associates, Ltd. Fuel
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Figure 5: KSM Drop Cell Unit Some o
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There is a tendency for fly ash to
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AgriPower 36 USA, Commercial Crop R
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BioMax 25 37 USA, Commercial Crop R
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102
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Solar-Biomass Hybrid Cabinet Dryer
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Two doors were designed for easy lo
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Asbestos gaskets are used while con
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The ash scraper slides through a cy
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flange attached at its bottom; this
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Other fuels such as saw dust brique
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The completed hybrid solar-biomass
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Greenfire 41 USA, Commercial Crop R
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Mayon Turbo Stove and Lo Trau Stove
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Social Considerations The stove was
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Commercial Gasifier 49 Philippines,
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The Modul-Pak ® boiler is a hybrid
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Suppliers Energy Quest, Inc. 850 So
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as well as the extraction, recovery
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oil production period in the mills.
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weatherproof and sound-attenuating
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Primenergy R-18 Gasifier producing
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Low-cost 500 kW thermal rice hull c
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Kansai Carbonized Rice Husk Gasifie
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Colusa Rice Straw / Hulls Technolog
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The customized harvester collects t
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Rice Husk Gasifier Philippines, Com
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2.5 MW Cogeneration Plant 65 Thaila
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San San Rice Husk Stove Myanmar, Co
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The technology of rice husk gasifie
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of trees can be controlled. This wo
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includes an automatic feeder, which
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Maligaya Rice Hull Stove 74 Philipp
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Parameters for Procurement Specific
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Page 166 and 167: a 100KW capacity Rice-Husk based Ga
Page 168 and 169: Rice husk briquette fuel 84 Banglad
Page 170 and 171: aised to US$ 6.84 million from the
Page 172 and 173: ease of removal of the char, a grat
Page 174 and 175: The rice husk gas burner for bakery
Page 176 and 177: Engineering and Environmental Manag
Page 178 and 179: Depending on the type of fuel it ha
Page 180 and 181: mode, all of the steam directed to
Page 182 and 183: pyrolysis) with air or oxygen at te
Page 184 and 185: R S for in-kind repair of boilers a
Page 186 and 187: Wood Biomass Electricity Generator
Page 188 and 189: Advantages to Developing Countries
Page 190 and 191: Celunol's "wet" biomass conversion
Page 192 and 193: up to 1.3 million liters of cellulo
Page 194 and 195: This process is done in shredder ma
Page 196 and 197: The minimal price established is $C
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Page 200 and 201: Telephone (303) 933-3135 FAX (303)
Page 202 and 203: Solar-Biomass Hybrid Cabinet Dryer
Page 204 and 205: The stove uses cylindrical honeycom
Page 206 and 207: Research Centre for Applied Science
Page 208 and 209: air. Woody biomass available in ple
Page 210 and 211: Dry Grind Ethanol 99 USA, Under Con
Page 212 and 213: Price Ethanol sells as a commodity
Page 216 and 217: footings made of brick and mortar.
Page 218 and 219: placed inside mild steel shell of l
Page 220 and 221: Biological Hydrogen Production from
Page 222 and 223: ioprocess for hydrogen production f
Page 224 and 225: a. Reactor: This was a downdraft, t
Page 226 and 227: Transpired Collector Solar-Biomass
Page 228 and 229: Drying chamber The drying chamber c
Page 230 and 231: Annexure 3 EST for Energy Conversio
Page 232 and 233: Detailed Process Description Figure
Page 234 and 235: Forest Products Research and Develo
Page 236 and 237: Advanced Gasification-Combustion (A
Page 238 and 239: Wood wool cement board (WWCB) Cemen
Page 240 and 241: Furnace-Type Lumber Dryer 105 Phili
Page 242 and 243: (i) Charring Drum. The charring dru
Page 244 and 245: The mould set is filled with the mi
Page 246 and 247: Solar Collector The solar collector
Page 248 and 249: Fluidized Bed Combustor for Steam G
Page 250 and 251: Small-Scale Biomass Pyrolyzer for F
Page 252 and 253: chips) aside from palay and allows
Page 254 and 255: Detailed Process Description There
Page 256 and 257: The IRRI DR-1 Batch Dryer 117 Phili
Page 258 and 259: Rice Hull Furnace attached to a blo
Page 260 and 261: was not continuously discharged fro
Page 262 and 263: Detailed Process Description Drying
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Rice Hull Ash Cement (RHAC) Hollow
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Annexure 4 EST for Material Convers
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Through a joint venture component m
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Abaca Mechanical Tuxer 129 Philippi
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Economic instruments for overcoming
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Figure 2. Fiber Twisting Machine
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Example of Real Life Applications C
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Main Products: Cellulosic Ethanol O
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converted to a high-carbon char mat
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NovaGreen Biomass Ethanol Separatio
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Advantages to Developing Countries
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Detailed Process Description 133 On
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286
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agricultural waste could theoretica
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downstream value-added products whe
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Bio-Enriched Method (Trichoderma an
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Increases yield. Improves water-hol
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Environmental Considerations 141 Co
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298
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150 150 http://www.kinseiseishi.co.
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152 Type of non-woven materials Che
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Bale as feedstock USA, Commercial C
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Price of Machine : refer to the tab
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2. Cooking the Fiber: A rope is lai
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9. Weaving: Water is sprayed on the
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Decorticating Machine and Motorised
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usually contains two spindles set i
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tradition and, moreover, the range
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318
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Over 3.5 million coconut farmers ar
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The blades also propel coir fibre t
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Economic instruments for overcoming
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first using the drum method or the
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Job Potential: Farmers' cooperative
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Soundproofing and Insulating Materi
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The environmental impact is signifi
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. Suppliers K.E.F.I. - Kenaf Eco Fi
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Detailed Process Descriptions: 1. H
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In a two-stage setup, the target wi
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companies with expertise in this we
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Mezcal Production from Maguey Phili
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5. Crushing the agave. The roasted
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Method of Propagation Applying fert
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Main Products 198 Abaca fiber comes
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Being a high-priced fabric has prac
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Detailed Process Description 202 Me
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Rice Husk basket Burner India, Comm
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The ash should be white or grey wit
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Paper from Rice Straw Cyprus, Comme
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1. Vatting - Fill your vat halfway
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Ethanol Production by Acid Hydrolys
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improvements would provide cost sav
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Detailed Process Description 7. Ric
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Plywood from Sorghum China, Commerc
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Example of Real Life Applications L
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Figure 1. Schematic of gasifier-pow
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hull is a processing by-product of
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The size of the mill or number of m
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Figure 3. A 12-ft continuous evapor
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The finished syrup is thoroughly st
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Drinking Vinegar from Sweet Sorghum
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only four months. Ethanol, a cheape
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Davis & Standard Twin Screw Extrude
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Environmental and Social Considerat
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Detailed Process Description Figure
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operational analysis be carried out
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Figure 2. Hopper or Feeder The comp
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Broin Fractionation (BFRAC) 218 USA
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Collaboration with other companies
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NET INCOME Before Tax = 237, 600 -
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Cornstalk Flash Volatilization USA,
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Decentralized Wastewater Treatment
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degrades the wastes. The algal pond
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Job Potential: 231 Preparing the so
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Operations and Maintenance Requirem
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Detailed Process Description There
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Biochar 237 USA, Research Crop Resi
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422
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424
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Detailed Process Description: 241 2
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In addition to functioning as a thi
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The underflow from the first stage
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y essentially dry process technique
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industrial uses. It consists of mol
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yeast for high alcohol, and high-te
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About the UNEP Division of Technolo
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Converting Waste Agricultural Biomass into a Resource - UNEP

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