电极布置方式对石墨化炉热电场的影响

Effect of electrode arrangement on the thermoelectric field of graphitization furnace

建立了连续式石墨化炉的几何模型和热电耦合数学模型,运用数值计算方法对其温度场、电场进行了求解。采用了3种电极布置方式,即电极布置在炉体顶端左右分布(方式A),炉体上、下两端(方式B),炉体左、右两侧(方式C),研究了电极布置方式对石墨化炉热、电场的具体影响。在同等条件下,电极呈布置方式A时,炉体温度和电场强度偏高,布置方式B和C时,炉体温度和电场强度均偏低,但布置方式A的炉体温度均匀性差于后两种布置方式。为提高炉体温度均匀性,提出电极布置方式D,即电极正极在炉体中心布置,负极呈圆弧板环绕正极布置。综上计算结果显示,电极呈布置方式D时,炉体温度和电场强度达到最高,能耗最低,温度均匀性最好。

The geometric model and thermoelectric coupling mathematical model of the continuous graphitization furnace were established, and the temperature field and electric field were solved by numerical calculation method. Three types of electrode arrangement were used, i.e., electrode arrangement on the top of furnace body, upper and lower ends of furnace body, left and right sides of furnace body, to study the specific effect of electrode arrangement on the graphitization furnace thermoelectric field. Under the same conditions, the furnace temperature and electric field intensity are higher when the electrodes are arranged in the first mode, while the furnace temperature and electric field intensity are lower in the second and third modes, but the uniformity of furnace temperature in the first mode is worse than that in the latter two modes. In order to improve the uniformity of furnace temperature, a fourth electrode arrangement method was proposed, i.e., the positive electrode was arranged in the center of furnace body and the negative electrode was arranged around the positive electrode with an arc plate. In conclusion, the results show that when the electrode is arranged in the fourth mode, the furnace temperature and electric field intensity reach the highest level, the energy consumption is the lowest level, and the temperature uniformity is the best level.