The world is full of machines. Right from a fan to an airplane, everything works on mechanics. And even though it seems to be rocket science, it is not very difficult to understand the way these machines work. If the basics are set right, children can understand the minute details of every machine even it be a rotary dryer. The best way to do it is create a dummy of a machine your kid is fascinated with at you house and learn it practically. Of course, do the theory first and make sure you watch over when trying anything new.
Introducing Kids to the World of Rotary Dryers
In simple words, a rotary dryer is a dryer used by industries to negate or at least decrease the dampness of any material it is treating through exposing it directly to heated gas. The reason it is called rotary is because it is made up of a rotating cylinder. Let us look at it's make in detail.
Make of Rotary Dryer
As mentioned, the rotating cylinders or to say the rotating shell is supported by rollers or tyres. However, in case of a huge rotary dryer, it can also be supported by cement columns or steel pillars. For the dryer to rotate, the driver needs to be handled in appropriate manner. There are two permanent covers at both the ends, one to let in the air or gas, and the second to collect the cooling agents. The feeding instrument is ruled by screw feeder or trough. The revolving shell in these rotary drying arrangement is supplied with especially planned material showering method like Lifters Garland Chains etc Let us now look at how it works. There are certain variations in the number of drums or shells a dryer consists. Multiple shells or drums reduce the amount of space a rotary dryer needs. Also, in case a combustion chamber is added on the entry, it ensure fuel efficiency and homogeneous drying air temperatures.
Once the material to be dried enters the rotary drier, the dryer starts rotating and the material is raised up by a succession of inner fins surrounding the inner wall of the dryer. When the material gets enough high from where it can roll back off the fins, it falls back to the bottom of the dryer, passing through the heated gas stream during the process. This gas stream can either be stirring in the direction of the release end from the supply end (known as co-current flow), or toward the feed end from the release end (known as counter-current flow). Let's now look at the types of dryers.
Direct Heated Dryer
In this case the gas stream could be made up of a combination of air and burning gases from a burner. Often used when product pollution becomes an issue.
Indirect Heated Drier
Yes, vice-versa. In this case, the gas stream may consist of air or another (sometimes motionless) gas that is heated from before. In some cases, a mix of direct-indirect heated rotary dryers is also available to improve the overall performance.
Rotary dryers are of great use for industries that deal in products manufacturing and those who have issues of product effluence. By now, you should be able to make a rotary dryer on your own and have fun with it.