DTN Production Blog
Dan Davidson DTN Agronomist

Monday Nov 2, 2009

Dry It

In my short eight year farming career I have never dried corn and in Nebraska I just have a wait and corn will naturally dry down to 16% and under in the field. But not this year, corn's moisturelevels will stay in the low to high 20s and there is nothing I can do about it. Onlya dry, long, sunny and warm spell make a difference - but this is November and that isn't likely.

Resurrected Middle States bin drier.

Knowing that corn will be wet I decided to resurrect our old Middle States batch drier that is actuallya 7,000 to 8,000 bu bin with a drier/fan combination.

This drier hasn't been used in at least 15 years (1992 to be exact) but we have used the fan and it works fine. However the wiring was all weather-checked and frayed, the propane gauge broken, and propane feed lines were worn out. The bin has a twin set of stirators that work but something electrical is wrong with the screw drive that pulls them in and out as the stirators circle the bin. So I hired an electrician who is also a grain bin and drier expert to come out and rewire the drier and fan, repair the stirators and check over the drier. I also purchased a gauge and new brass tubing and feed lines. Our local coop brought out a 500 gallon tank of propane and hooked it up.

So how will this play out? We have one field of soybeans to harvest and do I wait to let them dry down in the field to 14 and under or take them wet and put them in the drier? I will know that by the middle of the week when we take out the beans.

Corn will have to be dried but I have to figure out how long will it take to dry 7,000 to 8,000 bushels of wet corn. Since we no longer have the owner's manual to the drier and the company went out of business, I will have to figure out how long it will corn take to dry each batch of corn.

A call to the local grain bin dealer who actually sold my Dad the drier gave me all the information I need. He said that in a 24-foot bin with grain 6 foot deep and using a fan with a 10 hp motor and without stirators, it will take 24 hours to dry the grain down 9 points from 25.5 to 16.5 percent.

However I want to dry a bin full of corn. He said a 24 foot bin with grain 20 foot deep using a fan with a 10 hp motor and stirators, the grain should dry down 9 points in 48 hours. That is exactly what my brother thought it might take. However teh electric motor on the fan isn't large enough so I will probably replace it this week..

Drying corn will be the norm this fall and we need to get started combining corn so we can take out corn and start drying it in batches. This will be a drawn out harvest.

Posted at 09:13AM CST Nov 2, 2009 by Dan Davidson
Comments (6)
Dan, I have a 24’ bin dryer with stirring. If you fill yours with 25.5 moisture corn it will take FOREVER. The stirring augers will make channels. Some corn may never get dry. I would fill it to six feet. When that is dry I would add some more wet corn to maybe 10’ deep. When that is dry unload and start over. The tractor powered batch dryer it replaced was much faster on mid to upper 20’s corn.
Posted by Ian Cunningham at 10:04AM CST Nov 2, 2009
Ian - thanks for the advice. Another reader sent me an email this morning with similar advice, limit the depth to 6 feet when corn is at 25% or above and cycle through smaller amounts quicker.
Posted by Daniel Davidson at 10:37AM CST Nov 2, 2009
Rick Brandenburg who farms in southeast North Dakota sent me these comments. "Your resurrecting your dryer bin with stirrators. I have such a system and have learned some things the hard way. 1. Do not fill this to capacity with 25 moisture corn. A 12 to 14 foot depth with 25% is about all those stirrators will handle. Any deeper then that and the stirrators will not handle the corn as it starts releasing the moisture. This lesson is hard learned after enough times with a pipe wrench and jammed stirrators. Also, start the stirrators after dumping a few loads in the bin. 2. Keep the plenum temperature low (120 degrees) or so, until the corn is partially dryed. This not only helps lesson the load on stirrators but also prevents from scorching/cooking the corn. 3. A 10HP fan is the main reason for both of the above. Its not enough air volume to handle the extremely hot wet air associated to 25% moisture corn at grain depth. 4. 20-22% corn works great in a dryer bin and you can run it up against the wall accordingly. 25% + is a defferent animal altogether with this type dryer system. 5. Figure 100-125 bushel per hour drying capacity depending on if your dumping the bin warm/hot and cooling elswhere." GOOD ADVICE FOR A NOVICE.
Posted by Daniel Davidson at 07:53AM CST Nov 3, 2009
Steve Sickle from Ontario said "Us farmers in Ontario can dry corn in a bin up to 30%. Yes use a stirrator but also mount an old pig barn fan or sort thereof to a piece of plywood and put on top of bin after filling. this extra draw of air will help get the hot HUMID air out of the bininstead on condensing on the roof and running down the walls. Worked for us here in ontario instead on putting a liner in the bin."
Posted by Daniel Davidson at 07:48AM CST Nov 4, 2009
One of the most recent revelations about in bin drying is the lack of sufficient roof venting. The rule of thumb is if you open the roof door..and the air coming through it feels like it will blow off your hat...you probably need to add more vents. I've got several bins that are going to get quite a few more vents soon...maybe I should have got that done this summer huh???...LOL
Posted by Dave Watson at 09:01AM CST Nov 4, 2009
All interesting good points! A year for the record books! We are blessed with 19% corn and the fans are running full time and a great week for drying. Don't forget to smell and core those bins untill you get them settled with storable corn. This market is going to be ful land will want more corn next year.
Posted by Ed Winkle at 07:43AM CST Nov 6, 2009
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