When reviewing the equipment list for a steam-flaked corn production line, you may notice that the soaking system usually has more than one bin. Several bins are arranged to work together.
Why are so many bins needed? And how many should your production line have?
This affects more than equipment cost and available plant space. It also affects whether the corn has enough time to soak and can then be supplied to the steam chamber and flaking mill when needed.
Let's start with what the bins do and how they work together.
Soaking Bins Give Corn Time to Absorb Moisture
There's one thing that's easy to misunderstand: when we talk about soaking corn, we don't mean filling the entire bin with water and leaving the corn submerged.
Normally, water is added before the corn enters the bin, using a water-addition screw conveyor or other suitable moistening equipment. The bin's main job is to give the corn enough time to absorb that moisture.
In the BellaEx project configurations discussed here, the reference soaking time is approximately 8–12 hours.
We've already explained why water is added before steam conditioning and how soaking affects the following process in our Soaking vs. Non-Soaking article.
How Do Multiple Soaking Bins Work Together?
Having several soaking bins doesn't mean every bin needs to be filling and discharging corn at the same time, all the time.
With multiple bins, we can arrange their work in different stages so that the steam chamber and flaking mill continue receiving corn that has already completed its soaking period.
For example, in one type of bin rotation arrangement, one bin may be receiving fresh corn, another may be holding corn during soaking, and another may be ready to discharge corn to the next stage.
As production continues, the bins take turns carrying out these jobs rather than each one always doing the same thing.
When the bin supplying corn is nearly empty, another bin containing fully soaked corn needs to be ready to take over. The emptied bin can then receive another batch and rejoin the cycle.
With enough corn prepared in advance, sufficient bin capacity and a well-planned filling and discharge schedule, the steam chamber and flaking mill can continue running even when the corn needs 8–12 hours of soaking.
This way, the line doesn't have to stop after every batch and wait for the next soaking period to finish.
Caption: Soaking bins can take turns filling, holding and discharging corn to keep material moving to the steam chamber and flaking mill. This illustrates one possible operating arrangement.
In the BellaEx configurations discussed here, level sensors help control filling, discharge and switching between bins. Each bin operates according to the planned sequence.
This is one of the main reasons for using multiple soaking bins: the corn needs enough time to soak, and the next batch must be ready when the production line needs it.
How Many Soaking Bins Do You Need?
We usually start with two basic questions: How much corn enters the soaking system each hour, and how much corn can each bin actually hold?
Then, together with the required soaking time, we can work out the bin capacity and number of bins needed.
The more corn entering the soaking system each hour, the more corn needs to be held for the same soaking period. If each bin has the same capacity, a higher throughput may mean more bins are needed.
It's also important to distinguish between the volume of a bin and the weight of corn it can hold.
For example, 40 m³ describes the bin's volume. The actual weight of corn it can hold also depends on the corn's bulk density and the usable space inside the bin.
In the BellaEx configuration discussed here, the reference holding capacity is approximately 25 tonnes per bin.
Another factor is how many hours your production line will run each day.
Some customers operate for just one shift a day. They can prepare corn in advance and arrange soaking and discharge around their production hours.
Others need to keep their lines running 24 hours a day. In that case, filling, soaking and discharge need to be coordinated so that another bin is ready to supply corn when the current one finishes.
These two operating schedules require different arrangements for preparing corn in advance, switching between bins and keeping enough material ready for production.
That's why we can't decide how many soaking bins a line needs just by looking at its TPH rating.
Here are two BellaEx engineering configuration references:
|
Production line configuration |
Soaking bin arrangement |
|---|---|
|
5 TPH steam-flaked corn line |
2 × 40 m³ soaking bins |
|
10 TPH steam-flaked corn line |
4 soaking bins |
In the 10 TPH configuration, 10 TPH refers to finished-product capacity. When sizing the soaking bins, we use the amount of corn entering the soaking stage, rather than assuming the finished-product output is the same as the incoming raw corn flow.
Discuss Your Soaking Bin Configuration with BellaEx
If you're planning a steam-flaked corn production line with a separate soaking stage, you can start by telling us your target capacity, daily operating hours and available space.
If you already have soaking bins, you can also share their number, dimensions and details of the filling and discharge equipment.
At BellaEx, we can help you determine a suitable number and size of soaking bins based on your corn, soaking time and production schedule, while also looking at how the system will connect with the steam chamber and flaking mill.
CTA: Discuss Your Soaking Bin Configuration
If you'd like to learn more about the equipment used in the soaking system, visit our Soaking (Tempering) Solutions page.
If you're planning a complete steam-flaked corn project, you can also explore our Steam-Flaked Corn Production Line solution page.
