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The deep peak shaving and flexible operation of thermal power units increase the risk of crack faults in the rotors of main and auxiliary equipment, posing a serious threat to the safe and stable operation of the units. According to the established vibration equation of the cracked rotor, the main vibration characteristics of the cracked rotor are summarized. On this basis, combined with the field diagnosis experience, a practical method of identifying the cracked rotor through vibration analysis is proposed, with criteria including continuously climbing fundamental-frequency vibration and ineffective rotor dynamic balance, continuous increase of second harmonic vibration, abnormal Bode curve, and so on. Finally, three cases of rotor crack fault identification in the operation of a steam turbine, a generator and a boiler primary air fan are given to illustrate the practical application process and accuracy of this method.
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火电机组深度调峰、灵活性运行,增大了主、辅机设备转子出现裂纹故障的风险,对机组安全稳定运行构成严重威胁。根据建立的裂纹转子的振动方程,归纳了裂纹转子的主要振动特性,并在此基础上结合现场诊断经验,提出通过振动分析识别转子裂纹故障的方法,该识别方法判据包括持续爬升的基频振动且转子动平衡无效、2倍频振动持续增大、伯德曲线异常等。最后通过3起运行中的汽轮机、发电机和锅炉一次风机转子裂纹的故障识别案例,说明了该方法的实际应用过程及其准确性。
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张学延(1962),男,硕士,教授级高级工程师,主要研究方向为汽轮发电机组转子动力学特性,振动监测、故障诊断和治理,发电设备状态检修和机组事故分析,zhangxueyan@tpri.com.cn。
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张学延(1962),男,硕士,教授级高级工程师,主要研究方向为汽轮发电机组转子动力学特性,振动监测、故障诊断和治理,发电设备状态检修和机组事故分析,zhangxueyan@tpri.com.cn。
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49(2): 115-120., articleTitle=Application of abnormal Bode curve in crack diagnosis of HP-IP rotor of a 300 MW steam turbine, refAbstract=null)], funds=[Fund(id=1217836130859401541, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, awardId=HNKJ22-H103, language=EN, fundingSource=Science and Technology Project of China Huaneng Group Co., Ltd.(HNKJ22-H103), fundOrder=null, country=null), Fund(id=1217836130934899015, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, awardId=HNKJ22-H103, language=CN, fundingSource=中国华能集团有限公司总部科技项目(HNKJ22-H103), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1217836123825553497, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, xref=null, ext=[AuthorCompanyExt(id=1217836123833942107, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, companyId=1217836123825553497, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=Xi’an Thermal Power Research Institute Co, Ltd, Xi’an 710054, China), AuthorCompanyExt(id=1217836123842330720, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, companyId=1217836123825553497, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=西安热工研究院有限公司,陕西 西安 710054)])], figs=[ArticleFig(id=1217836127663341794, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, language=EN, label=Fig.1, caption=
Bode curves of shaft vibration in the Y direction of No.4 bearing during the shutdown on July 31, 2024, figureFileSmall=9K3yqGer9feLnteVfZZUFQ==, figureFileBig=pBh8Zr1NGywBSw4diNhtWA==, tableContent=null), ArticleFig(id=1217836127751422184, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, language=CN, label=图1, caption=
7月31日停机过程4号轴承Y方向轴振伯德曲线, figureFileSmall=9K3yqGer9feLnteVfZZUFQ==, figureFileBig=pBh8Zr1NGywBSw4diNhtWA==, tableContent=null), ArticleFig(id=1217836128061800694, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, language=EN, label=Fig.2, caption=
The circumferential crack at the root R-corner of the steam-inlet side hub of the 1st reverse-flow stage of the low-pressure rotor, figureFileSmall=Me2r9wRyi7eY4QScRGvYtQ==, figureFileBig=k9b1abTW7VfPUy4z+unEew==, tableContent=null), ArticleFig(id=1217836128141492474, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, language=CN, label=图2, caption=
低压转子反向第1级进汽侧轮毂根部R角部位周向裂纹, figureFileSmall=Me2r9wRyi7eY4QScRGvYtQ==, figureFileBig=k9b1abTW7VfPUy4z+unEew==, tableContent=null), ArticleFig(id=1217836128242155774, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, language=EN, label=Fig.3, caption=
Schematic diagram of the shaft system structure, figureFileSmall=bXXPFYLzKxy9G+OuPtyk1Q==, figureFileBig=2GbZ3SK5eEPYmbdZ9g8i3A==, tableContent=null), ArticleFig(id=1217836128351207685, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, language=CN, label=图3, caption=
轴系结构示意, figureFileSmall=bXXPFYLzKxy9G+OuPtyk1Q==, figureFileBig=2GbZ3SK5eEPYmbdZ9g8i3A==, tableContent=null), ArticleFig(id=1217836128435093767, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, language=EN, label=Fig.4, caption=
Bode curves of shaft vibration in X and Y direction of No.6 bearing during the start-up on March 7th, 2024, figureFileSmall=wxkC2tdiNX+/b0UpUwsihA==, figureFileBig=gZC8V5knlkdh45cdfEaylg==, tableContent=null), ArticleFig(id=1217836128527368459, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, language=CN, label=图4, caption=
2024年3月7日机组启动过程6号轴承X、Y方向轴振伯德曲线, figureFileSmall=wxkC2tdiNX+/b0UpUwsihA==, figureFileBig=gZC8V5knlkdh45cdfEaylg==, tableContent=null), ArticleFig(id=1217836128640614673, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, language=EN, label=Fig.5, caption=
Bode curves of shaft vibration in X and Y direction of No.6 bearing during the start-up on April 20th, 2023, figureFileSmall=qwX+kji/0tpBnYirPeIuZw==, figureFileBig=35zmY1SDgj+vjubef3AfYA==, tableContent=null), ArticleFig(id=1217836128716112148, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, language=CN, label=图5, caption=
2023年4月20日机组启动过程6号轴承X、Y方向轴振伯德曲线, figureFileSmall=qwX+kji/0tpBnYirPeIuZw==, figureFileBig=35zmY1SDgj+vjubef3AfYA==, tableContent=null), ArticleFig(id=1217836128787415320, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, language=EN, label=Fig.6, caption=
Results of dye penetrant test on the shaft diameter of the steam-end seal bush, figureFileSmall=jDKnCvx1JEY1IE4QFKIH+A==, figureFileBig=DZG4l8Ai8KHLntyHWcaqJw==, tableContent=null), ArticleFig(id=1217836128883884316, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, language=CN, label=图6, caption=
汽端密封瓦轴径着色渗透检测结果, figureFileSmall=jDKnCvx1JEY1IE4QFKIH+A==, figureFileBig=DZG4l8Ai8KHLntyHWcaqJw==, tableContent=null), ArticleFig(id=1217836128967770402, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, language=EN, label=Fig.7, caption=
Horizontal vibration trend of the bearing at the drive end of the primary air fan, figureFileSmall=iebSM0gXs/j3Ze6lEEGfTA==, figureFileBig=KFEgq9CMyYUGvtqmfFL3FQ==, tableContent=null), ArticleFig(id=1217836129039073571, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, language=CN, label=图7, caption=
一次风机驱动端轴承水平振动趋势, figureFileSmall=iebSM0gXs/j3Ze6lEEGfTA==, figureFileBig=KFEgq9CMyYUGvtqmfFL3FQ==, tableContent=null), ArticleFig(id=1217836129127153960, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, language=EN, label=Fig.8, caption=
Bode curves of horizontal and vertical vibrations of the drive end and free end bearings during the shutdown process on November 23rd, figureFileSmall=1ECmdztL8NHEVBZnJySE7A==, figureFileBig=zTu4uZSgnFzhguIHLAZO+Q==, tableContent=null), ArticleFig(id=1217836129227817265, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, language=CN, label=图8, caption=
11月23日停机过程驱动端和自由端轴承水平、垂直振动伯德曲线, figureFileSmall=1ECmdztL8NHEVBZnJySE7A==, figureFileBig=zTu4uZSgnFzhguIHLAZO+Q==, tableContent=null), ArticleFig(id=1217836129315897651, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, language=EN, label=Fig.9, caption=
Schematic diagram of the crack on the fan rotor, figureFileSmall=547UgpRIVDSCZOcZVhgpCQ==, figureFileBig=OfaV73ltcExTq6Kwducd6w==, tableContent=null), ArticleFig(id=1217836129374617912, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, language=CN, label=图9, caption=
风机转子裂纹示意, figureFileSmall=547UgpRIVDSCZOcZVhgpCQ==, figureFileBig=OfaV73ltcExTq6Kwducd6w==, tableContent=null), ArticleFig(id=1217836129466892603, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, language=EN, label=Tab.1, caption=
Vibration data of the generator and exciter in No.2 unit at rated speed (overall frequency, p-p)
, figureFileSmall=null, figureFileBig=null, tableContent=
| 序号 | 日期、工况 | 6号轴承 | 7号轴承 | 8号轴承 | 9号轴承 |
|---|
| 1 | 2024年03月05日,16:03,空载3 000 r/min | X向轴振 | 112 | 79 | 39 | 44 |
| Y向轴振 | 122 | 125 | 51 | 82 |
| 2 | 03月07日,13:50,空载3 000 r/min | X向轴振 | 89 | 62 | 40 | 42 |
| Y向轴振 | 99 | 101 | 55 | 66 |
| 3 | 03月07日,16:15,32 MW | X向轴振 | 139 | 106 | 50 | 73 |
| Y向轴振 | 195 | 154 | 79 | 107 |
| 4 | 03月08日,16:16,50 MW | X向轴振 | 111 | 135 | 26 | 68 |
| Y向轴振 | 214 | 181 | 100 | 87 |
), ArticleFig(id=1217836130746155329, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1217836119857742734, language=CN, label=表1, caption=
2号机组定速后的发电机、励磁机振动数据(通频,峰-峰值)
, figureFileSmall=null, figureFileBig=null, tableContent=
| 序号 | 日期、工况 | 6号轴承 | 7号轴承 | 8号轴承 | 9号轴承 |
|---|
| 1 | 2024年03月05日,16:03,空载3 000 r/min | X向轴振 | 112 | 79 | 39 | 44 |
| Y向轴振 | 122 | 125 | 51 | 82 |
| 2 | 03月07日,13:50,空载3 000 r/min | X向轴振 | 89 | 62 | 40 | 42 |
| Y向轴振 | 99 | 101 | 55 | 66 |
| 3 | 03月07日,16:15,32 MW | X向轴振 | 139 | 106 | 50 | 73 |
| Y向轴振 | 195 | 154 | 79 | 107 |
| 4 | 03月08日,16:16,50 MW | X向轴振 | 111 | 135 | 26 | 68 |
| Y向轴振 | 214 | 181 | 100 | 87 |
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