蜂窝密封技术在空分增压机级间密封上的应用

针对内蒙古某煤化工厂空分增压机组在生产过程中存在的推力轴承瓦温度偏高等问题，提出了对增压机级间密封进行整体蜂窝技术改造的方案。通过对级间密封结构优化前后叶轮端面轴向受力变化的理论分析及利用计算流体动力学（CFD）软件进行仿真验证，得出级间密封的失效是引起转子轴向力变大的主要原因，并对增压机级间密封进行了蜂窝技术改造。改进后的级间密封结构使得增压机级间串气量减小，叶轮两侧高压气体压力差有所降低，各级压缩效率得到提高，解决了推力轴承瓦温度偏高和气体出口压力不足等问题。蜂窝密封技术在空分增压机级间密封上的成功应用，为解决高速离心压缩机轴向力过大这一问题提供了新的有效方案和改进措施，值得进一步应用推广。

Application of cellular sealing technology in the interstage sealing of an air separation supercharger

After understanding the problem of the high temperature of a thrust bearing bush in an air separation booster unit in a coal chemical plant in Inner Mongolia, a transformation of the interstage seal of the booster based on honeycomb sealing has been proposed. Based on a theoretical analysis of the change in the axial force of the impeller face before and after optimization of the interstage seal structure, and verification by simulations using the computational fluid dynamics (CFD) software, the failure of the interstage seal was identified as the main reason for the increase in the axial force of the rotor. The improved interstage sealing structure reduces the gas volume between the booster stages, reduces the pressure difference between the high pressure gases on the two sides of the impeller, and improves the compression efficiency at all levels, which solves the problems of the high temperature of the thrust bearing bush and insufficient gas outlet pressure. This successful application of honeycomb sealing technology in the air separation booster stage seal provides a new and effective means of solving the problem of excessive axial force in a high speed centrifugal compressor, which has many potential practical applications.