Brief: Cleaning Grain: Part I -Why We Do It and the Physics Behind Every Cleaner

Post I of VI in the GG50 grain cleaning series

So what

A cleaner only separates what size, shape, density, or air can tell apart, so the plant has to decide what clean means before it picks the machine.

Key takeaways

• Grain never arrives as just grain. Corn brings cobs and fines. Wheat brings chaff and weed seed. Beans bring pods and splits. Rice brings straw and same-size stones.

• A screen only sees size. A rock the same width as the kernel stays in the product.

• An aspirator only sees air. Light grain and chaff can leave together if their terminal velocity is close.

• Destoners and gravity tables both see density. A destoner makes a two-way heavy reject. A gravity table grades several fractions.

• Clean at a country elevator is not clean at a seed house or a rice mill. The machines overlap. The goal does not.

• Performance does not come off the nameplate. Incoming condition, feed rate, airflow, screen condition, and maintenance decide the split.

Who should read the full piece

U.S. elevator managers, mill and feed superintendents, and merchandisers who choose between cleaning and taking the discount. Also plant operators outside the U.S. who run wheat, maize, pulses, or paddy on the same four properties.

Read Full Post at:  https://www.grainguyfifty.com/post/cleaning-grain-part-i-why-we-do-it-and-the-physics-behind-every-cleaner

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