Citrus Peel Dryer

Rotary Drum Dryers, 70 feet long and large enough to walk inside, are used in the citrus industry to dry peel after the extraction of juice. They are sometimes called Feed Dryers because the dried peel is most often used as cattle feed.

This project included the design and specification, construction, installation, and inspection of a new feed dryer system. It included removal of an old dryer, new feed and discharge conveyors, and realignment of several existing systems. Importantly, it also included retrofit to PLC control from the peel bins to the warehouse.

PLC automation provided a number of significant benefits:

Startup and Shutdown reduced to four buttons.

There previously had been 40+ loads that were individually started. They had to be started in proper sequence to satisfy interlocks, even though the buttons were not in sequence on the various panels. Now, four buttons sequence up or down the entire combustion system, wet end, dry end and warehouse systems.

Fire Protection enhanced.

A peel dryer operates on the edge of combustion of the peel. Because of this, most dryers have a fire suppression system. At a preset temperature, the combustion burner is turned off. If there is a fire, temperature continues to climb.

The main component of this fire suppression system is the introduction of smothering steam. This is sometime manually controlled, and frequently automated by steam valves opening at a temperature setpoint.

I enhanced this system by automating additional components usually controlled by the operator. The suction box fans and Waste Heat Induction fan were interlocked off. The dryer drum motor was interlocked on, with a backup pony motor in standby. Dampers were closed in ductwork, some screws tripped off. Other screws were interlocked on, to remove embers from the dryer, and gates were opened to drop this hot material in a safe place.

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	Rotary Drum Dryers, 70 feet long and large enough to walk inside, are used in the citrus industry to dry peel after the extraction of juice. They are sometimes called Feed Dryers because the dried peel is most often used as cattle feed. This project included the design and specification, construction, installation, and inspection of a new feed dryer system. It included removal of an old dryer, new feed and discharge conveyors, and realignment of several existing systems. Importantly, it also included retrofit to PLC control from the peel bins to the warehouse. PLC automation provided a number of significant benefits: Startup and Shutdown reduced to four buttons. There previously had been 40+ loads that were individually started. They had to be started in proper sequence to satisfy interlocks, even though the buttons were not in sequence on the various panels. Now, four buttons sequence up or down the entire combustion system, wet end, dry end and warehouse systems. Fire Protection enhanced. A peel dryer operates on the edge of combustion of the peel. Because of this, most dryers have a fire suppression system. At a preset temperature, the combustion burner is turned off. If there is a fire, temperature continues to climb. The main component of this fire suppression system is the introduction of smothering steam. This is sometime manually controlled, and frequently automated by steam valves opening at a temperature setpoint. I enhanced this system by automating additional components usually controlled by the operator. The suction box fans and Waste Heat Induction fan were interlocked off. The dryer drum motor was interlocked on, with a backup pony motor in standby. Dampers were closed in ductwork, some screws tripped off. Other screws were interlocked on, to remove embers from the dryer, and gates were opened to drop this hot material in a safe place. Home t Feedback