Gas Fired Fluidized Bed Dryer Controls for Cement Industry

SUMMARY:  

Developed a 2 burner, 2 Zone combustion control and feed control system for a Gas Fired Fluidized Bed Dryer.

DESCRIPTION:  

The PLC monitors and maintains zone temperature setpoints by controlling the combustion air fan and gas valves.  The system continuously monitors interlocks for safety and shutdown circumstances.  Each zone has fuel valve and combustion air PID control to allow smooth start-up and shut down.  Logic was developed to allow Bumpless transition from automatic to manual control.  

The cement feed rate is controlled to maintain dryer bed temperature while the cement discharge valve is controlled to maintain dryer bed level.

The operator has complete manual and automatic control of the system through the graphical HMI.  All alarms and events are recorded to a database and displayed as they occur.