The duct electric heater is an explosion-proof electric heater that can be used in hazardous areas where explosions may occur. The explosion-proof grade can reach dⅡB and C levels, and the pressure resistance can reach 20MPa.
The duct electric heater has fast thermal response, high temperature control accuracy, and high overall thermal efficiency. It has high working temperature, uniform medium outlet temperature, wide application range, and strong adaptability. The duct electric heater is made of special electric heating materials, designed with low surface power load, and adopts multiple protections, greatly increasing the safety and service life of the electric heater.
Explosion-proof electric heaters are generally used in hazardous areas where explosions may occur. Due to the presence of various flammable and explosive oils, gases, dust, etc. in the surrounding environment, contact with electric sparks can cause explosions. Therefore, heating in such occasions requires the use of explosion-proof electric heaters. The internal control system of the electric heater automatically adjusts the output power of the electric heater based on the temperature sensor signal at the outlet, making the medium temperature at the outlet uniform.
If the heated material overheats, causing coking, deterioration, or carbonization, it may severely damage the heating element, effectively extending the service life of the electric heater. The main explosion-proof measure of the explosion-proof electric heater is an explosion-proof device in the junction box, eliminating the risk of electric spark ignition.
The resistance wire of the duct electric heater is made of nickel-chromium alloy, with a temperature of up to 800°C. Since the power of electric heaters is relatively large, if users neglect safety, a fire may occur at any time.
What are the causes of fires in electric heaters? How can we prevent fire hazards?
The main causes of fire are as follows:
1. The electric heater is not equipped with a plug, and the wire end is directly inserted into the socket, which can easily cause a short circuit and lead to a fire.
2. Placing an energized electric heater on or near combustible materials, causing a fire under prolonged high-temperature baking.
3. The user leaves without unplugging the electric heater, causing it to overheat over time and ignite nearby combustibles, resulting in a fire.
4. Repeatedly repairing the resistance wire and continuing to use it can cause circuit overload and lead to a fire.
Measures to prevent fire hazards:
(1) When in use, do not place flammable and explosive items near the electric heater; maintain a certain safety distance.
(2) The safe current-carrying capacity of the electric heater's wires must meet the capacity requirements of the heater. Industrial electric heaters must be equipped with a separate circuit under any circumstances.
(3) The wires must be equipped with a plug; do not directly insert the wire end of the electric heater into the socket. The electric heater must be placed on a non-conductive, non-combustible base.
(4) The duct electric heater must be attended during use. Unplug it when leaving. In case of a power outage during use, promptly unplug the electric heater and do not forget.
(5) For resistance wires that have been repaired multiple times, it is no longer recommended to use them; replace them with new resistance wires.
(6) If the wires of the electric heater are aged or damaged, replace them promptly. Do not use electric heaters without a fuse installed in the circuit.
(7) It is strictly prohibited to use electric heaters to dry flammable and explosive items.
(8) The electric oven should have a temperature control device to prevent both excessive temperature and prolonged baking time.
(9) Although the duct electric heater has multiple protection devices, check all wiring terminals for firmness before use. Implement grounding measures to ensure safety.
(10) Install a filter at the air inlet and clean it regularly to prevent foreign objects from entering and damaging the heating tube or affecting its lifespan and heat dissipation performance.
