過熱水蒸気利用による金属切削屑脱脂システムの実用化に関する消費エネルギー分析

抄録

Superheated steam is applied to oily waste metal cutting chips disposed from metal-working factories for degreasing, and the effectiveness of introduction of this system for waste metal recycling is evaluated. In the experiment, a practical circulation-type superheated steam degreasing system is introduced. However, this system consumes higher specific energy than conventional centrifugal oil separation or compression systems. Therefore, it is expected to find an optimum operation condition of this system for practical application. In this paper, the influence of the process temperature and steam flow rate on the degreasing performance and energy consumption are evaluated. This degreasing system consumes considerable energy for the preheating of system equipments and steam generation. The energy recovery time, i.e. energy recovery capacity of waste material, which reduces the effect of energy consumption of preheating is estimated as well. As a result, a superheated steam waste degreasing system for oily waste metal cutting chips can well reduce the adhesion rate of oil of less than 1.0%, which is difficult to attain by other degreasing methods. The relative relationship of energy consumptions of preheating and degreasing operation is numerically shown. The effective operation condition for practical application is proposed.