PAES 201

• Batch type


  Mechanical grain dryer wherein the grain in fixed volume is held in the drying chamber in batches until the grain reaches the desired moisture content
• Flat bed type


  • Cofilinous flow
  • Moves in the opposite direction of the air flow
• Recirculating type


  • Batch type dryer equipped to circulate and/or mixed fixed vol of grain during the drying operation
• Vertical bin type


  • Columnar type
• Shallow bed batch type dryer

  • Fixed volume of grain held stationary in a horizontal grain holding bin
• Continuous flow dryer


  Dryer in which the material being dried moves through the drying chamber in a substantially continuous stream and is discharged without being recirculated
• Concurrent flow type


  • Continuous flow dryer wherein the product being dried moves in the same direction as drying air
• Counter-flow type


  • Continuous flow dryer wherein the grain being dried move in one direction and the drying air moves in the opposite direction
• Cross-flow type


  • Continuous flow dryer wherein the flow of air is transverse to the direction of flow of the grain being dried
• Mixing type


  • Continuous flow dryer wherein the drying bin is similar to columnar drying bin except that includes louvers causing mixing to occur as the grain flows through the system
• Non-mixing type


  • Continuous flow dryer wherein the grains in the drying bin flows through the column in a straight path
• Cracked grain


  Grains which show signs of fissures or fractures or spers
• Direct-fired dryer


  Dryer in which the products of combustion come into direct contact with the product being dried
• Indirect-fired dryer


  Dryer in which the products of combustion do not come in contact with the products being dried
• Drying efficiency


  Ratio of the total heat utilized to vaporize moisture in the material, to the amount of heat added to the drying air expressed in percent
• Dust collecting system


  Device used to collect dust (i.e. consist of aspiration fan, cyclone, etc.)
• Fan


  Air moving device that is used to force heated air through the mass of grains at the desired air flow rate and pressure
• Grain dryer


  Device for removing excess moisture from the grain, generally by forced or natural convection with or without addition of heat
• Head rice


  Grain or a fraction of grain with its length equal to or greater than et-tenth (8/10) of the average length of the whole grain
• Heated-air mechanical grain dryer

  Device used to remove grain moisture by forcing heat air through the mass until the desired moisture content is attained
• Heating system efficiency


  Product of combustion efficiency and burner/furnace efficiency
• Moisture gradient


  Difference between the maximum and the minimum grain moisture content randomly sampled after drying
• Multi-pass dryer


  Mechanical grain dryer wherein grain is passed intermittently in cycles or stages through a drying chamber either by mechanical means or by gravity with subsequent cooling and tempering until the grain reaches the desired moisture content
• Plenum


  Chamber wherein air pressure is developed for uniform distribution of the heated air through the grain mass
• Safety device


  Any device that is used to avoid human accident and/or damage to the parts and components of the dryer during the operation and automatically shuts-off the operation of the dryer in case of malfunction