本文選題：軸系標(biāo)高 + 軸承載荷�。� 參考：《華北電力大學(xué)》2017年碩士論文

【摘要】：軸系標(biāo)高在汽輪發(fā)電機(jī)組安全運(yùn)行方面具有比較重要的影響,隨著大容量、高參數(shù)的汽輪發(fā)電機(jī)組的普及,軸系標(biāo)高在運(yùn)行過程中變化的情況更加的明顯,非常容易造成機(jī)組出現(xiàn)振動(dòng)故障,影響機(jī)組的安全與穩(wěn)定。軸承的標(biāo)高變化對(duì)載荷分配影響的研究已經(jīng)逐漸受到關(guān)注,軸系標(biāo)高測(cè)量分析將會(huì)是解決汽輪機(jī)組振動(dòng)故障的有效手段。本文結(jié)合了國(guó)產(chǎn)某型600MW汽輪發(fā)電機(jī)組,通過集中參數(shù)法對(duì)轉(zhuǎn)子進(jìn)行了建模,并采用傳遞矩陣法來計(jì)算汽輪機(jī)組軸系的揚(yáng)度曲線和各個(gè)軸承的載荷分配。通過分析軸承變標(biāo)高情況對(duì)載荷分配的影響,進(jìn)行靈敏度研究并對(duì)計(jì)算結(jié)果進(jìn)行分析,得出一些為現(xiàn)場(chǎng)工作提供理論依據(jù)的結(jié)論:當(dāng)軸承標(biāo)高發(fā)生改變時(shí),相鄰的兩個(gè)軸承所受到的作用效果是相反的;某軸承的標(biāo)高變化時(shí),對(duì)自身及通過聯(lián)軸器連接的相鄰軸承的影響最大,并且影響效果大小相近方向相反。在基于連通管的軸系標(biāo)高測(cè)量系統(tǒng)設(shè)計(jì)研究中,分別從硬件選擇、軟件設(shè)計(jì)等方面對(duì)系統(tǒng)進(jìn)行設(shè)計(jì)研究。首先對(duì)相關(guān)硬件設(shè)備進(jìn)行了研究,選取高精度電渦流傳感器、前置器、標(biāo)高數(shù)據(jù)采集模塊等硬件設(shè)備來實(shí)現(xiàn)系統(tǒng)的數(shù)據(jù)采集和信號(hào)處理等功能。然后開始軟件方面得設(shè)計(jì),系統(tǒng)軟件編寫采用VC++語(yǔ)言,以模塊化進(jìn)行結(jié)構(gòu)設(shè)計(jì),以菜單的形式來設(shè)計(jì)顯示界面。將軸系標(biāo)高測(cè)量系統(tǒng)應(yīng)用于實(shí)際案例,對(duì)某超臨界濕冷660MW汽輪機(jī)組以及某國(guó)產(chǎn)空冷600MW汽輪機(jī)組的軸系標(biāo)高變化進(jìn)行了現(xiàn)場(chǎng)測(cè)量,并對(duì)測(cè)量結(jié)果進(jìn)行分析總結(jié),驗(yàn)證了系統(tǒng)的可靠性。最后對(duì)比分析了EED、CEEMD信號(hào)分析方法的差異,討論了將CEEMD方法應(yīng)用于優(yōu)化閾值降噪方法,并結(jié)合某電廠發(fā)生的振動(dòng)故障案例,進(jìn)行了分析、診斷與處理,確定機(jī)組振動(dòng)出現(xiàn)異常幅值較大是由于標(biāo)高變化引起的,通過改變機(jī)組的軸系標(biāo)高使機(jī)組振動(dòng)幅值明顯降低。
[Abstract]:Shafting elevation plays an important role in the safe operation of turbogenerator sets. With the popularization of large capacity and high parameter turbine-generator sets, the change of shafting elevation in operation process is more obvious. It is very easy to cause vibration failure of the unit, which affects the safety and stability of the unit. The influence of bearing elevation on load distribution has been paid more and more attention. The measurement and analysis of shaft elevation will be an effective method to solve the vibration fault of steam turbine unit. In this paper, a 600MW turbine-generator set made in China is used to model the rotor by means of the lumped parameter method, and the transfer matrix method is used to calculate the lift curve of the shaft system and the load distribution of each bearing. By analyzing the influence of bearing elevation variation on load distribution, the sensitivity study and calculation results are analyzed, and some conclusions are drawn that provide theoretical basis for field work: when bearing elevation changes, The effect of the two adjacent bearings is opposite. When the elevation of a bearing changes, it has the greatest influence on itself and the adjacent bearings connected by the coupling, and the effect is opposite in the same direction. In the design and research of shaft elevation measurement system based on connected tube, the system is designed from hardware selection, software design and so on. Firstly, the related hardware equipment is studied, and the high precision eddy current sensor, preprocessor, elevation data acquisition module and other hardware devices are selected to realize the data acquisition and signal processing functions of the system. Then the software was designed, the system software was written with VC language, the structure was designed by modularization, and the display interface was designed in the form of menu. The shafting elevation measurement system is applied to practical cases. The shaft elevation changes of a supercritical wet cooling 660MW turbine unit and an air-cooled 600MW turbine unit made in China are measured on the spot, and the measured results are analyzed and summarized. The reliability of the system is verified. Finally, the differences of EEDX CEEMD signal analysis methods are compared and analyzed, and the application of CEEMD method in optimizing threshold noise reduction method is discussed. The analysis, diagnosis and treatment of vibration faults in a power plant are also given. It is determined that the abnormal amplitude of unit vibration is caused by the change of elevation, and the amplitude of unit vibration is obviously reduced by changing the elevation of shafting.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM311

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