Solar, Biomass and Hybrid Dryers - BioEnergy Discussion Lists
Solar, Biomass and Hybrid Dryers - BioEnergy Discussion Lists Solar, Biomass and Hybrid Dryers - BioEnergy Discussion Lists
ChimneyDryingChamber1DryingChamber2MainBlowerFuelHopperAmbient AirHeated AirRecirculated AirHeatExchangerCombustionChamberNot to scaleFigure 9.2: Schematic of the rice husk-fuelled drying system FD200Drying chamberThe drying chamber, 1.37m wide, 2m tall and 2.9m long, contains two movable traycarts having 26 trays each. It is made of galvanized iron sheets framed together byangular steel bars. The trays (of dimensions 0.98m x 0.97m) are made of polyethyleneplastic mesh reinforced with aluminum bars. The total area of the drying trays canaccommodate 200 kg of mango slices. The chamber also has an air distributionsystem, which ensures distribution of air into the entire height of the chamber. Theair distribution system is composed of an axial fan (with a 0.35m dia. rotor) and adistributor 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 m 3 /sec.Biomass furnace - Heat exchangerThe rice husk-fuelled furnace is composed of five parts: the combustion chamber,heat exchanger system, fuel hopper, air inlet duct, and the chimney. The combustionchamber is made of bricks enclosed in galvanized sheet metal while the heatexchanger system is made of 27 boiler tubes arranged in a rectangular array. Allother parts of the furnace are made of galvanized iron sheet. A butterfly valvecontrolled by a variable speed electric motor (0.5 hp) controls the feed rate of ricehusk; the fuel hopper is inclined at 45º (angle of repose of rice husk) to allow freeflow of rice husk into the combustion chamber. An auxiliary blower (0.5 hp) wasinstalled in the combustion chamber to supply the primary air required for completecombustion. The primary air supply to the furnace can be controlled by adjusting theopening of the blower air inlet.48
The main blower installed between the furnace and the drying chamber draws theambient air through the furnace-heat exchanger unit, and supplies hot air to thedrying 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 avoidsuction of ashes that may otherwise contaminate the product to be dried. The fuelhopper has a capacity of three sacks of rice hull per loading which lasts for about 3 to4 hours of dryer operation.The dryer has been tested with mango and banana. The quality of the dried bananaand mango were found to be very good, with no browning observed. The total costof fabricating this dryer is about US$1,800.49
- Page 8 and 9: NepalEr. Rishi K. B. ShahVice Presi
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- Page 12 and 13: Chapter 1PACKAGES DEVELOPED AT AIT,
- Page 14 and 15: Glass cover40A - A10535Glass woolin
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- Page 38 and 39: Figure 5.1: Improved solar cabinet
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- Page 42 and 43: Package 6: Improved Solar Tunnel Dr
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- Page 48 and 49: Dimensions are in mmFigure 7.2: Bac
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- Page 52 and 53: chimney is removed and the drum is
- Page 54 and 55: Chapter 3PACKAGES DEVELOPED AT UP,
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ChimneyDryingChamber1DryingChamber2MainBlowerFuelHopperAmbient AirHeated AirRecirculated AirHeatExchangerCombustionChamberNot to scaleFigure 9.2: Schematic of the rice husk-fuelled drying system FD200Drying chamberThe drying chamber, 1.37m wide, 2m tall <strong>and</strong> 2.9m long, contains two movable traycarts having 26 trays each. It is made of galvanized iron sheets framed together byangular steel bars. The trays (of dimensions 0.98m x 0.97m) are made of polyethyleneplastic mesh reinforced with aluminum bars. The total area of the drying trays canaccommodate 200 kg of mango slices. The chamber also has an air distributionsystem, which ensures distribution of air into the entire height of the chamber. Theair distribution system is composed of an axial fan (with a 0.35m dia. rotor) <strong>and</strong> adistributor duct. The distributor duct has a converging shape from top to bottom,<strong>and</strong> 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 m 3 /sec.<strong>Biomass</strong> furnace - Heat exchangerThe rice husk-fuelled furnace is composed of five parts: the combustion chamber,heat exchanger system, fuel hopper, air inlet duct, <strong>and</strong> the chimney. The combustionchamber is made of bricks enclosed in galvanized sheet metal while the heatexchanger system is made of 27 boiler tubes arranged in a rectangular array. Allother parts of the furnace are made of galvanized iron sheet. A butterfly valvecontrolled by a variable speed electric motor (0.5 hp) controls the feed rate of ricehusk; the fuel hopper is inclined at 45º (angle of repose of rice husk) to allow freeflow of rice husk into the combustion chamber. An auxiliary blower (0.5 hp) wasinstalled in the combustion chamber to supply the primary air required for completecombustion. The primary air supply to the furnace can be controlled by adjusting theopening of the blower air inlet.48
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