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