PAES 201-211

• 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


  • Shallow bed batch type dryer wherein a fixed volume of grain is held stationary in a horizontal grain holding bin
• Recirculating type


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


  • Columnar type batch type dryer wherein a fixed volume of grain is held stationary in a vertical 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
• Types of continuous flow dryers

  • Concurrent flow type
  • Counter-flow type
  • Cross-flow type
  • Mixing type
  • Non-mixing type
• 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 it 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
• Non-mixing type consists of two parallel screens or columns of louvers. The space between the two columns is the plenum chamber where heated air is introduced and forced through the grain.
• Cracked grain


  Grains which show signs of fissures or fractures or splinters
• 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 eight-tenth (8/10) of the average length of the whole grain
• Heated-air mechanical grain dryer

  Device used to remove grain moisture by forcing heated air through the grain 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