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我厂生产钨粉用的四管还原炉是50年代的产品,性能落后,维修量大,必须进行技术改造。 一、采用新材料改造炉管和舟皿 还原炉中装金属氧化物用的舟皿是还原钨粉的必用工具。原设计炉管和舟皿材质为1Cr18Ni9Ti,存在以下问题:①在700～950℃的工况下运行,短时间内即起氧化皮,逐层脱落,炉管外部的氧化皮掉在电热元件上,沉积到一定厚度,造成电热元件短路、烧毁并烧坏炉管,炉管内壁和舟皿的氧化皮掉入粉末中造成粉末杂质含量增加。②由于炉管氧化,厚度减薄,加上炉管三段温度不同,受热不均,使炉管严重弯曲、变形不能使用。③焊缝裂纹故障多,炉管在高温通氢的工况下,奥氏体不锈钢晶粒长大,晶间腐蚀,造成焊缝开裂、漏氢,被迫停炉,一台炉一个月内要停炉5～6次。
I plant the production of tungsten powder with four tube reduction furnace is a 50’s product performance behind, large amount of maintenance, technological transformation must be carried out. First, the use of new materials to transform the furnace tube and boat reduction furnace with metal oxide boat is the necessary tool to restore the tungsten powder. The original design of the furnace tube and boat material 1Cr18Ni9Ti, the following problems: ① operating conditions 700 ~ 950 ℃, a short period of time from the oxide layer, layer off, the tube outside the oxide fell on the heating element , Deposited to a certain thickness, resulting in short circuit heating elements, burned and burned furnace tube, furnace tube wall and boat oxide scale into the powder resulting in increased powder impurities. ② As the furnace tube oxidation, the thickness of thinning, coupled with the furnace tube temperature of three different, uneven heating, the furnace tube serious bending, deformation can not be used. ③ weld cracks and more, the furnace tube in high temperature hydrogen conditions, austenitic stainless steel grain growth, intergranular corrosion, resulting in weld cracking, leakage of hydrogen, was forced to shutdown, a furnace within a month To stop furnace 5 to 6 times.