Scope of use of duct heaters for flange heating pipes

Introduction to air duct electric heaters: Air duct heaters are mainly used for heating the air inside the air duct. There are three methods for standardization: low temperature, medium temperature, and high temperature. The common feature of the structure is the selection of steel plates to support the electric heating tube to reduce its vibration. The junction box is equipped with over temperature control equipment. In addition, in terms of control, in addition to over temperature maintenance, intermodal equipment has been installed between the fan and heater to ensure that it is necessary to add differential pressure equipment before and after the fan starts, in order to prevent defects in the fan.
The gas pressure heated by the channel heater should generally not exceed 0.3kg/cm2. If you need to exceed the above pressure, please choose a circulating electric heater. Low temperature heater gas heating with a high temperature not exceeding 160 ℃; Medium temperature type not exceeding 260 ℃; High temperature type shall not exceed 500 ℃. Application field: The air electric heater is mainly used to heat the required air flow from the initial temperature to the required air temperature, up to 650 ℃.
Heating channels, drying channels, drying rooms, and monotonic equipment have been widely used. Especially suitable for active temperature control text high flow high-temperature heaters. The air electric heater is widely planned and can heat any gas. Hot air is monotonous, anhydrous, conductive, incinerating, explosive, and chemically corrosive, and the heating space is fast (controllable). The intuitive method for verifying the quality of electric heating tubes is to first wipe the surface of the electric heating tube, then connect an AC 220V power supply, dry burn in air, turn off the power after the surface turns red.
After the electric heating tube has completely cooled, wipe it with a napkin. There should be no black oxide powder on the white paper (excluding oxygen in the air), indicating that the electric heating tube is an electric heating tube. The quality of the electric heating tube mainly depends on the following aspects: electrical strength, insulation, leakage current, power accuracy, lifespan, corrosion resistance, scale appearance, etc. Electrical strength: The factors that affect the electrical strength of the electric heating tube mainly include the thickness of the insulation layer, the quality of the insulation layer material, the length of the electric heating tube, the bending radius, and the bending R number.
At present, the cold withstand voltage of electric heating tubes generally requires a breakdown current of 0.5ma at 2000V/1s. Insulation: The main reason affecting the insulation of electric heating tubes is the sealing process of the tubes. After sealing with high-temperature powder, it should reach at least 104m Ω, while medium temperature magnesium powder, medium temperature magnesium powder, or modified powder should reach 103m Ω. Leakage current: mainly related to the heating length of the temperature electric heating tube and the quality of magnesium powder when using a flange heating tube. This is also an important inspection target for high-temperature electric heating tubes. Power accuracy: mainly related to the quality of the resistance wire and the manufacturer's technological level. Generally, a temperature coefficient test is required before mass production to determine the qualified cold resistance.