The surface load of the electric tubular heater has a direct relationship with the life of the electric heating element. In different environments of use and different heating media, different surface loads should be used when designing the heating elements. Application electric heating tube material and surface load (power density) watt / square centimeter application example 10-20# stainless steel copper tube aluminum tube static air heating is not applicable to showers, water heaters, etc. soft water is not applicable, not suitable for advanced kitchen water, etc. The principle of electric heating element Tubular heating element is a kind of heating magnesium oxide powder which is placed in a metal tube and is closely filled with crystalline magnesium oxide powder with good heat resistance, thermal conductivity and insulation in the surrounding space, and then processed by other processes. . What is the service life of the electric heating tube? The electric heating tube may have problems. It has the advantages of simple structure, high mechanical strength, high thermal efficiency, safety and reliability, convenient installation and bench life.
1. Widely used in a variety of saltpeter tanks, water tanks, acid and alkali tanks and air heating oven drying ovens, hot molds and other devices. Fault phenomenon: the fuse fuse is too small in diameter, the capacity is insufficient; the power cord plug is short-circuited with the electric socket; the lead wire or lead wire of the electric heating tube is short-circuited; the electric heating tube (core) is burned and caused short main technical indicators: Power parameter: rated voltage The power under is +5%-10% Leakage current: Leakage current at operating temperature <0.5mA Electrical strength: Electrical strength at operating temperature withstand experimental voltage >1000V, 50Hz, 1MIN, there should be no flash breakdown: Insulation Resistance: cold insulation resistance ≥100MQ (megohm) Appearance: no significant mechanical damage or local expansion, no wrinkles, bumps and other phenomena in the bend.
2. Mainly used in open and closed solution tanks and circulating system heating non-standard flange electric heater products 5 major features: small size, large heating power; large surface power, is the surface heating of air heating 2 ~ 4 times. It can heat various media in various occasions, such as explosion-proof occasions; it is highly dense and compact. Because the whole is short and dense, the stability is good, the installation does not need brackets to choose imported and domestic high-quality materials, scientific production technology, strict quality management, to ensure the superior electrical performance of the electric heating tube.
3. Heating temperature is generally up to 720 °C. The heating system can be fully automated, including control of the electric heating system through the DCS system; long service life, multiple protection systems, safe and reliable. Most of the combined type uses argon arc welding to connect the electric heating tube to the flange. It can also be in the form of a fastening device, that is, each electric heating tube is welded with a fastener, and then the nut is locked with the flange cover, and the tube is tight. The firmware is argon-arc welded and never leaks. The fastener seal adopts a scientific process, and the single replacement is extremely convenient, which greatly saves the maintenance cost in the future. The electrical performance is stable and the thermal efficiency is high, which is more than 30% energy saving than the general metal heating body, and the heating rate is extremely fast.