Electric immersion heater for boiler applications
Boiler immersion heater Heating tube Electric heating tube heating method, its electrical characteristic is that the water in the boiler is not charged. But when the electric heating element leaks or bursts, the water in the boiler will also be charged, which is called leakage. In addition, affected by the degree of insulation of the insulating and thermally conductive layer of the electric heating element, the electric heating pipe also has a certain leakage current. According to national standards, the leakage current should not be greater than 0.5mA. Therefore, leakage protection should be provided on electrical circuits.
Boiler immersion heater is the heart of the electric boiler, and its performance is directly related to the performance of the electric boiler. immersion heater generally adopts tubular form, which is composed of metal stainless steel pipe, nickel-chromium alloy electric heating wire, lead-out rod, connection seat and magnesium oxide filler. In general, the service life of electric heating tubes is 10,000-30000 hours. The service life of the electric heating pipe mainly depends on the material of the electric heating pipe, the surface heat load and the user's operation management level. The electric heating pipe is a nickel-chromium stainless steel pipe with a surface thermal load of 6-9 W / cm2. In addition, the rated electric power of the electric heating pipe is also a very important performance indicator. Under the rated conditions, according to the national standard, the absolute value of electric power deviation should not be greater than 5%.
Boiler immersion heater The connection method of electric heating tube is generally three-phase, symmetrically connected into a star (Y) or triangle (△). Divided into two or more groups based on capacity.