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2024-08-29
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1、问题描述
某上汽-西门子超超临界1000MW机组润滑油水份长期超标，危害极大。经检查，#1轴颈与轴瓦背弧球面电腐蚀现象严重，分析认为，高压缸前轴封蒸汽漏入#1轴承室，并由此进入润滑油系统。
2、改造措施
该机组A修周期为12年，轴封间隙暂无法调整；通过降低轴封汽压力，收效甚微，又由于现场空间狭小，无法外设挡汽装置或加装轴封体。综合比较后，决定采用气压密封式油挡，具体为通过管路向油挡本体内引入干燥的压缩空气，通过油挡均压室将空气分配到密封齿中间，在油挡轴向位置中部形成正压区，从而堵住油挡齿与轴之间的间隙，具体设备与改造装置系统图如下。
需要说明的是，为了防止压缩空气对润滑油的二次污染，特意在系统中设置硅胶干燥罐；为了减少空气与轴颈之间的温差，设置了加热装置，将压缩空气加热到130～150℃。
3、整改结果
改造后一年的连续监测对比表明，润滑油中水份由原来的100mg/L左右，降至17mg/L以下，颗粒度由原来的10左右降至8以下，问题得到根本解决。改造前因润滑油水份超标的维护费用为25万元/年，此次气压密封性油档改造，总计花费仅6万元。
资料来源：1000MW主机润滑油水份超标的原因及处理，全国600MW级机组能效对标及竞赛第十九届年会论文集。
来源：汽机监督（ID：qijijiandu）
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Hangzhou Jingzhou Bearing Co.,Ltd.
Address：Liangzhu Indystrial City Hangzhou
Service hotline：0571-88777186 88777665
Jiangsu Jingzhou Bearing Co., Ltd.
Address：No.19, Yulan Avenue, Xuyi Economic DevelopmentZone, Huai’an City, Jiangsu Province
Service hotline：0517-80817777
Website：www.jzbearing.com
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