循环氢压缩机叶轮突发性开裂的应对措施

针对中化弘润石油化工有限公司1.0 Mt/a柴油加氢装置BCL408A型循环氢压缩机转子第三级叶轮突发性开裂的问题,在确定其他级叶轮正常的情况下,结合压缩机转子结构,采取将开裂的第三级叶轮去掉,首级、次级叶轮依次后移,在原首级叶轮处增加一个轴套,保证各叶轮的相对固定的改造方法,并用倒挂加热法使转子叶轮级数由原先的8级变成7级。改造后对转子进行实模态分析和高速动平衡试验得知,改造后的转子一阶临界转速由原来的4 949转/min降到4 814转/min,在相同工况下压缩机出口压力降低132 kPa,依然可满足运行要求。从压缩机改造前后各运行数据的综合分析得知,去掉开裂叶轮对压缩机的运行以及整个装置的正常投产没有实质性影响。

Countermeasures for sudden cracking in impeller of recycle hydrogen compressor

Based upon the sudden cracking of the 3rd-stage impeller of BCL408A recycle hydrogen compressor in a 1.0 MM TPY diesel hydrotreating unit in Sinochem Hongrun Petrochemical Co.,Ltd.,the possible causes were analyzed.A reconstruction method is presented,which combines the compressor rotor structure to remove the 3rd-stage cracked impeller and moves the first and second impeller back in turn.A conduit is installed at the former head impeller to ensure that each impeller is relatively fixed.The rotor wheel stages are changed from the original 8 to 7 with the down heating method.It is known from the real model analysis and high speed balancing test after revamping that the first order critical speed of rotor has changed from 4 949 r/min to 4 814 r/min.The compressor outlet pressure is reduced to 1.32 × 105 Pa under the same conditions,which still meets the requirement of the operation.It is concluded from the analysis of operation data before and after the revamping of compressor that the removal of cracked wheel has no substantial impact on the normal operation of the compressor and the entire unit.