[10p-M113-1~17] 10.5 Application of magnetic field

[10p-M113-15] Application of superconducting magnetic separation for the removal of scales from boiler feed water in thermal power plants

〇Noriyuki Hirota¹, Hidehiko Okada¹, Fumihito Mishima², Shigehiro Nishijima², Junya Yamamoto³, Mami Hiramatsu³, Yoko Akiyama³, Hideki Matsuura⁴, Seitoku Namba⁴, Tomokazu Sekine⁵ (1.NIMS, 2.Fukui Univ. of Tech,, 3.Osaka Univ., 4.Shikoku Research Institute, 5.Ebara Industrial Cleaning)

Keywords:magnetic separation, removal of scales

The thermal power generation is one of the major ways to generate electricity, however, they discharge a large amount of carbon dioxide. Improvement of the energy conversion efficiency in thermal power plants is expected to contribute for reduction of fuel consumption and carbon dioxide emission. Deposition of scale in the water circulation system and the boiler degenerates energy conversion efficiency. Therefore, reduction of scale seems to contribute to decrease fuel consumption and carbon dioxide emission.Most of scales consist of iron oxides. When temperature of water excesses about 200 degree C, most of irons form magnetite and deposits on wall of pipes. Magnetite can be separated magnetically from the boiler feed water. Therefore, we are studying the way to adopt the high gradient magnetic separation technique to this system.