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Efficient Aeration Techniques for Flat Structures in Grain Storage

Learn about uniform air flow, duct sizing, preventing spoilage, grain sampling methods, and equipment needed for proper aeration in flat structures. Discover ways to prevent dead zones and spoilage, ensuring high-quality grain storage.

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Efficient Aeration Techniques for Flat Structures in Grain Storage

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  1. Lecture 17 Flat Structures

  2. Aeration for Flat Structures • Ideally - uniform air flow •  "dead zones"  • min. of .2 cfm design rate (this is double) • fines concentrate under filling auger... • Duct pacing and storage •    less than or equal to grain depth •    longest air path should be less than or equal to 1.5 times the shortest path •  max. slope to grain = 10%

  3. Aeration for Flat Structures • Duct Sizing • number of bushels • airflow rate • design velocity • Positive vs Negative pressure • 2,500 fpm = positive • 1,500 fpm = negative

  4. Grain Sampling and Inspection •  Tell Tale signs •    leaking grain •    bulging walls •    snow melting off the roof •  Prevention of dead zones... •    perforated flooring best •    when ducts are used: probe "dead zones

  5. Preventing spoilage • Preventing spoilage •   perforated floor best, but fines accumulate below the floor - good spot for insects • checking "dead zones" • ducts can have fines accumulate, however cleaning and treating is much easier. • "core" in center of bin (where grain unloads) prevents air movement- spreader • probe areas where the probing is more difficult • filling and unloading leads to stagnant grain • Stirring devices • use of a vapor barrier • sealing bottom ring to concrete

  6. Sampling equipment needed • Moisture tester • Sampling probe • Temperature probe • Measuring tape • Grain dividers • Scale to weigh foreign material

  7. Getting a good sample • Divide bin into 5 equal parts • use probe • Sample each section

  8. Still concerned? • Fan test...Musty odor? • Corrective Action •    Insects - fumigate •    Wet - dry •    Hot - aerate • Note- Value of sampler greater than value of sample

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