Darui Electric recommends
Duct electric heater is an explosion-proof electric heater, which can be used in dangerous places where explosion may occur. The explosion-proof grade can reach dⅡB and C, and the pressure resistance can reach 20MPa.
Duct electric heater has fast thermal response, high temperature control accuracy, and high overall thermal efficiency. The working temperature is high, the medium outlet temperature is uniform, the application range is wide, and the adaptability is strong. The duct electric heater is made of special electric heating materials, with low surface power load design and multiple protections, which greatly improves the safety and service life of the electric heater.
Explosion-proof electric heaters are generally used in dangerous places where explosion may occur. Since there are various flammable and explosive oils, gases, dusts, etc. in the surrounding environment, once they come into contact with electric sparks, they will cause explosions. Therefore, explosion-proof electric heaters are required for heating in such occasions. 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, so that the medium temperature at the outlet is uniform.
If the heated material overheats and causes coking, deterioration, carbonization, or even burns out the heating element in severe cases, the service life of the electric heater can be effectively extended. The main explosion-proof measure of the explosion-proof electric heater is that there is an explosion-proof device in the junction box of the heater to eliminate the hidden danger of electric spark ignition.
The resistance wire of the duct electric heater is made of nickel-chromium alloy, and the temperature can reach above 800°C. Since the power of electric heaters is relatively large, if the user neglects safety, a fire may occur at any time.
What are the causes of fire 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 easily causes a short circuit and a fire.
2. Placing the energized electric heater on combustible materials or near flammable materials, causing a fire under long-term high-temperature baking.
3. The user of the electric heater fails to unplug the plug when leaving, causing the electric heater 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 the circuit to be overloaded and cause a fire.
Measures to prevent fire hazards:
(1) When using, do not place flammable and explosive items near the electric heater, and maintain a certain safe distance.
(2) The safe current-carrying capacity of the electric heater wire must meet the capacity requirements of the electric heater. Industrial electric heaters must be equipped with a separate circuit under any circumstances.
(3) The wire must be equipped with a plug, and the wire end of the electric heater must not be directly inserted into the socket. The electric heater must be placed on a non-conductive non-combustible material base.
(4) The duct electric heater must be attended when in use. Unplug it when leaving. In case of power failure during use, the electric heater plug should also be unplugged in time to avoid forgetting.
(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) The aging and damaged wires of the electric heater should be replaced in time. Electric heaters without fuses installed in the circuit must not be used.
(7) It is strictly forbidden 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 excessive baking time of the electric heater.
(9) Although the duct electric heater has multiple protection devices, all wiring terminals should be checked for firmness before use. Grounding measures should be taken to ensure safety.
(10) A filter screen should be installed at the air inlet, and the filter screen should be cleaned regularly to prevent various foreign objects from entering and damaging the heating tube or affecting the life and heat dissipation performance of the heating tube.
Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.
