Causes and troubleshooting of reduced current during the operation of electric heaters:
Cause analysis: The internal electric heating tubes are burnt out. When the electric heater is installed horizontally, if the gas medium contains a high amount of accumulated dust or the pressure difference between the inlet and outlet of the electric heater is low, dust may deposit and cover the electric heating tubes inside, preventing heat dissipation, eventually causing the tubes to burn out. The tubes at the bottom are most prone to burning out.
Troubleshooting: Regularly record the operating current of each group of electric heaters. When it is found that the maximum operating current of an individual group gradually decreases, it can be determined that the internal electric heating tubes are burnt out. A few burnt-out tubes will not affect system operation, and the tubes can be replaced during unit shutdown for maintenance. If most tubes are burnt out and the outlet temperature cannot meet system requirements, the maximum power of the faulty group can be appropriately increased to ensure normal system operation.
