Product Details

Coal Mine Wellhead Hot Air System
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1.1 Key Points for Safe Operation Design of Wellhead Anti-Freezing Electric Hot Air Furnace System
(1) Incoming Cabinet
l  The incoming cabinet consists of a knife switch, voltmeter, ammeter, voltage selector switch, and current transformer.
l  The incoming cabinet provides power to two control cabinets.
l  The knife switch serves as electrical isolation from the transformer to the control cabinet.
(2) Control Cabinet
l  Temperature sensors are used for temperature detection, including an over-temperature prevention sensor, hot air outlet sensor of the hot air furnace, ambient temperature sensor, and mixed air temperature sensor.
l  Smoke and gas sensors serve as alarm sensors.
l  The temperature controller is used for temperature display and setting, with RS485 communication function.
l  Temperature parameters detected by the hot air furnace outlet temperature sensor, ambient temperature sensor, and mixed air temperature sensor are sent to the temperature controller for display, while the programmable controller adjusts the number of heating groups and power regulators based on the temperature.
(3) Automatic Temperature Control Process
l  Power on, supply control power.
l  Close the power switch for each circuit.
l  Set the selector switch to automatic mode.
l  The control system will automatically start the blower; if the blower does not start, heating cannot be activated.
l  The control system will automatically activate one heating circuit first, then sequentially start each heating circuit.
l  When the temperature reaches the set value, through PID calculation, it will sequentially disconnect one heating circuit, then two heating circuits... until the outlet temperature of the infrared hot air furnace equals the set temperature. If the temperature is lower than the required design value, it will sequentially add one heating circuit until the mixed air temperature balances to 2°C.
l  This adjustment ensures a constant outlet temperature and ensures that the lagging wellbore mixed air temperature is not less than 2°C.
l  The above adjustment process is automatically completed by the programmable controller without manual intervention.
l  It features overload current protection, safe operating temperature protection, fan operation protection, etc., comprehensively improving equipment safety performance.
1.2 System Commissioning
Connect the power supply, close the knife switch of the incoming cabinet; the equipment is in standby state. Check whether the indicator lights and instrument readings are normal.
1.2.1 Set the control mode of the control cabinet to manual mode
l  Close the control circuit breaker inside the control cabinet.
l  Close each heating circuit breaker inside the control cabinet.
l  Close the fan circuit breaker inside the control cabinet.
l  Check whether the temperature displayed on the temperature controller is normal (should equal ambient temperature).
l  Check whether the set temperature on the temperature controller is normal (can be changed manually or via communication).
l  Turn the selector switch to manual mode.
l  Manually start the fan; observe whether the fan current is normal and the rotation direction is correct (if reversed, adjust the fan motor power supply phase sequence).
l  Manually turn on each heating circuit sequentially and observe whether the ammeter current is normal.
l  After observing for one hour, stop the heating circuits sequentially, then stop the fan.
1.2.2
l  Close the control circuit breaker inside the control cabinet.
l  Close each heating circuit breaker inside the control cabinet.
l  Close the fan circuit breaker inside the control cabinet.
l  Check whether the temperature displayed on the temperature controller is normal (should equal ambient temperature).
l  Check whether the set temperature on the temperature controller is normal (can be changed manually or via communication).
l  Turn the selector switch to automatic mode.
l  The fan starts automatically.
l  The system sequentially starts circuit 1.
l  The system automatically starts the remaining heating circuits.
l  Automatically adjust the number of heating circuits based on the set temperature.
l  Adjustment method: When the temperature reaches the set value and still exceeds it, sequentially disconnect one heating circuit until the infrared hot air furnace outlet temperature equals the set temperature and the mixed air temperature approaches 2°C. If the temperature is lower than the required set value and the mixed air temperature is less than 2°C, sequentially add one heating circuit.
l  In automatic mode, remote control runs automatically; remote control can adjust the number of heating circuits, set temperature, etc.
l  Parameters such as voltage, current, and temperature of the hot air furnace can be viewed on the remote monitoring display.

Note: The above information and technical parameters are compiled and released by Yangzhou Dali Electric Co., Ltd.