Coal Conveyor in High Temperature Environment in Power Plant |
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Technical Application Notes Situation: A power plant has a coal conveyor located in a high temperature environment. This conveyor feeds a boiler in the power plant, the steam from which powers turbines used for electric power generation. If the conveyor stops abruptly, down time could be very costly due to lost electrical generation, extensive material clean up, and possible equipment damage. Solution 1: Mount a Magnetic Disk on the conveyor, align a Digital Output Hall Effect Sensor to the disk. Wire the sensor to a ZS10 Motion Detector Module which is located away from the high temperature zone. When the conveyor stops abruptly, the ZS10 responds within 1 second enabling the "stop" circuit on a motor starter, VFD or PLC reducing downtime and expense. Solution 2: Mount a Magnetic Disk on the conveyor, align a Digital Output Hall Effect Sensor to the disk. Wire the sensor to a PE-3 Tachometer. When the conveyor stops abruptly, the PE-3 Tachometer relay responds promptly enabling the "stop" circuit for the conveyor drive motor, helping to minimze down time and preventing the problem from compounding. The PE-3 Tachometer's 4-20 mA feedback signal is sent to a PLC or DCS updating conveyor speed status. This is particularly useful for early detection of a problem before it occurs. If the speed begins to decrease, this can indicate an unwanted increase in the load on the conveyor. When the 4-20 mA signal reaches a particular level, the PLC or DCS can send an alert indicating a potential problem. Early detection improves production significantly as conveyor problems are prevented from compounding, thus reducing downtime and expense. |