MAGNETIC FILTER FOR SMALL PARTICLES.

Abstract One of the problems raised by the development of steam power plants and nuclear reactors is the formation of “crud”, mostly consisting of magnetite, which is found in suspension in the boiler feed-water. The rather high temperature of 250–300°C precludes using resin filters for the direct elimination of these impurities. Therefore a magnetic filter for this task was conceived and partially developed. The large force needed to attract and remove crud particles flowing with the liquid is obtained by means of ferromagnetic pins placed axially in a uniform magnetic field. The theoretical and experimental results obtained are reported. In addition, design parameters and cost estimates for a 1000 ton per hour system are given.