What is the relationship between surface load and service life of electric heating tube

(Summary description)The surface load of the electric heating tube has a direct relationship with the service life of the electric heating tube.

The surface load of the electric heating tube has a direct relationship with the service life of the electric heating tube. In different environment and heating medium, different surface load should be adopted when designing electric heating element. Application application electric heating tube material and surface load (power density) w / cm2 application examples 10-20 stainless steel copper tube aluminum tube static air heating is not applicable to shower, water heater and other soft water, not applicable to high-grade kitchen water, etc. it belongs to the principle of tubular electric heating element Tubular heating element is a kind of heating element which put resistance wire into metal tube and filled with crystal magnesia powder with good heat resistance, thermal conductivity and insulation in the surrounding space, and then treated by other processes. It has the characteristics of simple structure, high mechanical strength, high thermal efficiency, safety and reliability, convenient installation and long service life.
1. Widely used in all kinds of saltpetre tank, water tank, acid-base tank and air heating furnace, drying box, hot mold and other devices. Fault phenomenon: the diameter of the fuse is too small and the capacity is insufficient; the plug of the power line is short circuited with the electric socket; the lead piece or lead wire of the electric heating tube falls off and causes the short circuit; the burning of the electric heating tube (core) causes the short circuit. Main technical indicators: power parameters: the power under rated voltage is + 5% - 10% leakage current: the leakage current under the working temperature is less than 0.5mA Electrical strength: the electrical strength at the working temperature shall withstand the test voltage > 1000V, 50 Hz, 1min, without flashover and breakdown: insulation resistance: cold insulation resistance ≥ 100mq (megohm) appearance: no obvious mechanical scar or local expansion, no wrinkle or concave convex at the bending part.
2. It is mainly used for heating non-standard flange type electric heater in open and closed solution tank and circulation system. The product has five characteristics: small volume, high heating power; large surface power, which is 2-4 times of air heating surface load. It can be used for heating various media in various occasions, such as explosion-proof occasion, etc.; it is highly dense and compact in structure. Due to its short and dense structure, it has good stability, no support is needed for installation. The imported and domestic high-quality materials are selected. The scientific production process and strict quality management ensure the superior electrical performance of the electric heating tube.
3. The heating temperature is generally up to 720 ℃, and the heating system can be fully automatic controlled, including the control of electric heating system through DCS system; it has long service life and multiple protection systems, which is safe and reliable. The combination type mostly adopts argon arc welding method to connect the electric heating pipe with the flange, and can also use the form of fastening device, that is, each electric heating pipe is welded with fasteners, and then it is locked with the flange cover by nut, and the pipe and fastener are welded by argon arc, which will never leak. The scientific technology is adopted in the sealing part of the fastener, and it is very convenient to replace the single fastener, which greatly saves the maintenance cost in the future. Stable electrical performance, high thermal efficiency, more than 30% energy saving than ordinary metal heating body, heating speed is extremely fast.