Two kinds of intelligent, hybrid control systems for a rotary dryer are presented. The main controlled variable is the output moisture of solids and the main manipulated variable is the input temperature of drying air which correlates to the fuel flow. The main disturbances of the process are the input moisture of solids and the feed flow.
generated by radio or microwave frequencies. In most dryers heat is transferred by more than one method, but each industrial dryer has one predominant heat transfer method. In rotary dryers this is convection, the necessary heat usually being provided by direct contact of a hot gas with the wet solid.
Electro mechanical controls were used in the past before computerized devices. An Electro mechanical control is a rotary multi selector switch operated by a small timer motor, it can also be advanced manually by turning the selector knob. Normally the selector knob can only be turned clockwise. The switch was reliable and not subject to all the ...
The main point is the rate of failure for the electronic control and or touchpad is leagues higher than that old mechanical timer mechanism we all used to have. I can remember doing work for a particular manufacturer where I would replace a touchpad on a dishwasher at least once a day and sometimes three a day.
Were so confident in our electronic control washers and dryers, we back them with an industry leading 5 year warranty on parts and in home labor. Thats 5 times longer than the industry average. Our mechanical timer models are backed with a 3 year warranty on parts and in home labor, which is 3 times longer than industry average.
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