以下为句子列表：
英文: The abnormal conditions of polyester vaccum system such as the frequent exchanging of liquid-ring pump in prepolycondensation Ⅰ, the occlusion of scraped condenser and vaccum atmospheric leg, the EG spray flow decreasing of vaccum injection pump, the work
中文: 摘要对聚酯真空系统的异常情况如预聚Ⅰ液环泵频繁切换，刮板冷凝器、真空大气腿堵塞、真空喷射泵EG喷淋流量降低，喷射泵本体工作性能偏低等进行了分析。
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