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德国G·H·H公司制造的2C220、250螺杆压缩机是川维厂乙炔装置的大型关键设备,自1979年开车生产以来,经过几年的连续运转,几台机组的螺杆转子浮环密封部位轴颈磨损严重。为了恢复浮环密封的密封性能,厂里决定对轴颈部位进行修复。原用的修复方法是镀硬铬,但运行了一段时间之后,在一对转子镀铬表面发现了裂纹;更为严重的是有一对转子在镀铬表面的R圆弧处发生了轴颈断裂,造成装置停产的事故。 一、镀硬铬与等离子喷涂的对比 对镀硬铬修复的转子使用情况进行了分析,认为在未查明螺杆转子镀硬铬表面产生细丝裂纹,以及镀硬铬部位产生轴颈断裂的原因之前,不宜继续采用镀硬铬修复工艺。我们建议用等离子喷涂新工艺修复2C220、250螺杆压缩机转子。理由如下:
2C220, 250 screw compressor made by Germany G · H · H Company is a large key equipment of acetylene plant of Chuanwei plant. Since its production in 1979, after several years of continuous operation, several units of screw rotor floating ring sealing parts The journal is worn badly. In order to restore the sealing performance of the floating ring seal, the factory decided to repair the journal part. The original repair method is hard chrome plated, but after a period of operation, cracks were found on the chromed surfaces of a pair of rotors. More seriously, a pair of rotors ruptured at the R-arc of the chromed surface resulting in Installation halted accident. First, the hard chrome plating and plasma spraying contrast Hard chrome plating repair of the rotor was analyzed, that did not identify the screw rotor chrome hard chrome plated surface cracks, as well as chrome hard chrome plated parts of the cause of journal fracture Before, should not continue to use hard chromium plating repair process. We recommend using a new plasma spray process to repair the 2C220, 250 screw compressor rotor. The reasons are as follows: