Measures to Ensure Reliable Operation of Electric Heaters
Measures to ensurethe reliable operation of electric heatersmainly include the following points:1 Optimize the design and installation of the electric heater to prevent internal dust accumulation
The burnout of electric heating tubes is the most frequent fault among all faults, mainly caused by excessive internal dust accumulation that cannot be discharged. Since replacing electric heating tubes takes a long time, when multiple tubes burn out, the outlet temperature of the heater will fail to meet system requirements, affecting the unit load for a long time or even causing shutdown, resulting in huge economic losses for the enterprise. Therefore, during the selection of the electric heater, system design, and installation stages, special attention should be paid to the issue of internal dust accumulation. It is required that the electric heater manufacturer increase the distance between the heating tubes and the inner wall of the body, and arrange the standby electric heating tubes at the bottom.
2 Improve the ventilation and heat dissipation of the electric heater control cabinet, ensuring that the ambient working temperature does not exceed 25°C
Since the SCR power regulator thyristor generates a large amount of heat during operation and has a thyristor overtemperature interlock protection trip function, when the thyristor working temperature exceeds 70°C, its temperature control element is triggered, interlocking the contactor to trip. During equipment operation, shutdowns caused by poor heat dissipation inside the electric heater control cabinet and high ambient working temperature occur frequently. Therefore, it is very important to improve the ventilation and heat dissipation of the electric heater control cabinet and ensure its working ambient temperature. Before ordering the heater control cabinet, the manufacturer should be required to use high-power cabinet cooling fans in the design, enlarge the air inlet area, design the cabinet size reasonably, and leave sufficient remaining space inside. The power distribution room where the control cabinet is located should be equipped with at least two air conditioners to ensure that the temperature of the power distribution room is kept below 25°C.
3 Strengthen the inspection of the electric heater to promptly detect and handle equipment abnormalities
The burnout of electric heating tubes is the most frequent fault among all faults, mainly caused by excessive internal dust accumulation that cannot be discharged. Since replacing electric heating tubes takes a long time, when multiple tubes burn out, the outlet temperature of the heater will fail to meet system requirements, affecting the unit load for a long time or even causing shutdown, resulting in huge economic losses for the enterprise. Therefore, during the selection of the electric heater, system design, and installation stages, special attention should be paid to the issue of internal dust accumulation. It is required that the electric heater manufacturer increase the distance between the heating tubes and the inner wall of the body, and arrange the standby electric heating tubes at the bottom.
