由于其介质为高炉煤气，属于易燃、易爆、有毒气体，所以要求透平膨胀机的轴端密封系统必须安全可靠，且运行经济。
Its medium is blast furnace gas which is inflammable, explosive and toxicant. Therefore, the shaft end sealing system of a turbine expander must be safe and reliable, and has economic running.
文章介绍了炉辊的轴向膨胀量、相对间隙、轴径实际温度及高温氧化减径量。
The paper introduces the axial inflation volume, relative space, temperature of axle neck and high temperature oxidized sizing reduction of rollers.
详细分析了引起膨胀机齿轮箱高速轴振值高的原因，提出了解决问题的办法及日常运行中应注意的问题。
Cause of high vibrated value of turbo-expander gearbox high-speed shaft was analysed in this paper. solution and attention problems were put forward.
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