The air compressor, booster, oil circuit system and booster end of expander and cold box of liquid oxygen pump of the 40000 m3/h oxygen generating unit with internal compression process were transformed, which has extended operation cycle and ensured long-term safe, stable and economical operation of the unit.%对40000 m3/h内压缩流程制氧机组的空压机、增压机、膨胀机油路系统、膨胀机增压端、液氧泵保冷箱进行改造；改造后，延长了运行周期，保证机组长期安全稳定经济运行。
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