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Removal of Iron Oxide Scale From Boiler Feed-Water in Thermal Power Plant by Magnetic Separation-Scale Removal at High-Temperature

The removal of scale by high gradient magnetic separation (HGMS) has been investigated utilizing the magnetic properties of the scale. This study focuses on a thermal power plant with oxygen treatment (OT), which has been applied in many new power plants with large generation capacity in recent years. At high-temperature conditions where the HGMS system is expected to be installed, the viscosity of the fluid will be lower than that of at room temperature, which makes the separation ratio higher. In this study, the scale capture rate at room temperature (25°C) and 80°C was investigated by particle trajectory calculation and experiment, in order to design magnetic separation conditions suitable for the high-temperature environment of the chemical cleaning line of the thermal power plant adopting OT.