节能涂料在电阻炉上使用效果的理论分析

本文用有限差分法进行数值分析,从理论上详细分析用高黑度涂料涂复炉壁内表面、电热元件、或工件表面后,对电阻炉空炉升温和工件随炉升温时的影响规律。得出:(1)提高炉壁内表面或电热元件的黑度,不能缩短电阻炉的空炉升温时间和工件随炉升温时间,故不起节能作用;(2)炉壁内表涂以高反射率涂料后,可明显缩短工件随炉升温时间,但不能减少空炉升温时间;(3)提高工件表面黑度,不能明显缩短工件随炉升温时间。

Theoretical Analysis on the Results of Using Power-saving Coating in Electric Resistance Furnace

In present paper minute numcrical analysis has been made theoretically, with Finite Difference Method, on the influence of high emissivity coating on the refractory wall, hearing elements and treating workpieces on the electric resistance furnace heating-up time at empty or with workpicces. The conclusions are as Follows: (1) The increasing of emissivity of coating on the refractory wall or heating elements cannot shorten the furnace heating-up time at empty or with workpleces. So the power cannot be saved; (2) If the refractory wall is covered with high reflectivity coating, the heating-up time with workpieces is reduced obviously, whereas the heating-up time at empty cannot be reduced; (3) Rising the emissivity of coating on workpieces won't shorten the heating-up time with workpieces obviously