過熱水蒸気循環型脱脂における蒸気条件が金属屑の脱脂性能に及ぼす影響

抄録

Superheated steam is used to process gas for degreasing oily waste because it prevents oxidation of waste metal and ignition of oil. The degreasing systems play an important role in improving the quality of oily metal as recycled materials. For safe operation in melting furnaces of waste metal and improving the quality of recycled materials, it is important to reduce the adhesion rate of oil for waste metal to 1.0% or less. In the experiment, a practical circulation-type superheated steam degreasing system is proposed, and an oily metal cutting chip disposed from a metalworking factory is processed. However, a superheated steam degreasing system consumes higher specific energy than conventional centrifugal oil separation or compression systems. Therefore, it is expected to find an optimum operation condition for the superheated steam degreasing to process the waste material. In this paper, an experiment is conducted to process gas temperatures of 400 °C or more, and the influence of the process temperature on the degreasing performance is evaluated. As a result, a superheated steam waste degreasing system for oily waste metal cutting chips can reduce the adhesion rate of oil less than 1.0%, which is difficult to attain by other degreasing methods.