AGC狀態(tài)下大型火電機組軸流引風機動特性分析
發(fā)布時間：2018-08-21 10:57
【摘要】：隨著可再生能源的大力發(fā)展,電網(wǎng)調(diào)峰面臨的挑戰(zhàn)越來越大。大型火電機組參與電網(wǎng)調(diào)峰成為必然,其調(diào)峰負荷響應速度亦成為考核機組對負荷響應能力的重要指標。目前國內(nèi)對于有償調(diào)峰與無償調(diào)峰劃分方式的探討,尚未有明確的衡量調(diào)峰補償與設備損壞程度的比對準則。本文探討火電機組鍋爐軸流風機在調(diào)峰過程負荷快速變化時的振動特性。通過采集火電機組現(xiàn)場風機振動數(shù)據(jù)進行分析得出定性結(jié)論,風機振動特性隨著機組負荷變化幅度、變化速度不同均表現(xiàn)出不同的幅值大小。后進行定量分析,建立風機轉(zhuǎn)子部件模型,計算葉片在不同負荷變化情況下的動特性響應。分析包括風機葉片的模態(tài)分析、諧響應分析以及瞬態(tài)激勵響應分析。模態(tài)分析以評估風機共振狀態(tài),諧響應分析繪制應力、變形頻率響應曲線,瞬態(tài)激勵響應探討不同負荷變化速度、不同負荷變化幅度下風機葉片的振動參數(shù)區(qū)別。首先通過現(xiàn)場測量數(shù)據(jù)建立軸流風機模型與流道模型[1],后利用CFD軟件Fluent進行風機流場數(shù)值模擬,簡化計算出流體作用于風機主軸上的扭矩,作為計算流體誘導振動的載荷。探討三種不同工況下(BMCR工況、TB工況、THA工況)風機的振動特性,并得出結(jié)論,機組負荷變化幅值大時,系統(tǒng)振動超調(diào)量大,衰減周期長,越難達到穩(wěn)定狀態(tài)；機組負荷變化速度快時,系統(tǒng)振動超調(diào)量大,衰減周期長,越難達到穩(wěn)定狀態(tài)。本文通過對比分析,證明了火電機組在參與AGC調(diào)峰時,對機組鍋爐輔機軸流引風機的工作狀態(tài)有一定的影響。調(diào)峰的深度與速度不同,風機葉片表現(xiàn)出的振動特性也不同。此結(jié)論提醒電廠工作人員在機組參與有償調(diào)峰時也要關(guān)注輔機的工作狀態(tài),需對比參與電網(wǎng)調(diào)峰補償與輔機損壞的利害關(guān)系,做出綜合考慮。同時,本文也作為深入計算風機在快速負荷變化的情況下壽命計算的參考方向,也為后續(xù)的研究提供理論依據(jù)。
[Abstract]:With the development of renewable energy, the challenge of peak-shaving in power grid is increasing. It is inevitable for large thermal power units to participate in peak-shaving, and their peak load response speed is also an important index to assess the capacity of generating units to respond to load. At present, there is no clear criterion to measure the compensation for peak shaving and the degree of equipment damage in the discussion of the division between paid and unpaid peak-shaving. In this paper, the vibration characteristics of the axial flow fan of thermal power unit boiler are discussed when the load changes rapidly during the peaking process. By collecting the field fan vibration data of thermal power units, the qualitative conclusion is drawn that the vibration characteristics of fans show different amplitudes with the varying amplitude of unit load and varying speed. After quantitative analysis, the rotor component model of the fan is established, and the dynamic response of the blade under different load changes is calculated. The analysis includes modal analysis, harmonic response analysis and transient excitation response analysis of fan blade. Modal analysis is used to evaluate the resonance state of fan, harmonic response analysis is used to draw stress, deformation frequency response curve, and transient excitation response to discuss the difference of vibration parameters of fan blade under different load changing speed and different load change amplitude. Firstly, the axial fan model and the flow channel model are established through the field measurement data. Then the flow field of the fan is numerically simulated by CFD software Fluent, which simplifies the calculation of the torque acting on the main shaft of the fan as the load to calculate the fluid-induced vibration. The vibration characteristics of the fan under three different working conditions (BMCR / TB / tha) are discussed. It is concluded that the larger the load variation amplitude, the larger the vibration overshoot, the longer the attenuation period, the more difficult to reach the stable state. When the load of the unit changes rapidly, the vibration overshoot of the system is large and the attenuation period is long, so it is more difficult to reach the stable state. Through comparison and analysis, it is proved that thermal power unit has certain influence on the working state of axial flow induced fan of boiler auxiliary machine when participating in AGC peaking. The vibration characteristics of fan blade are different with the depth and speed of peak shaving. This conclusion reminds the power plant staff to pay attention to the working state of auxiliary machines when the units participate in the paid peak-shaving. It is necessary to make a comprehensive consideration by comparing the interests of participating in the peak-shaving compensation of power grid and the damage of auxiliary machines. At the same time, this paper also serves as the reference direction for further calculation of the life of fan under the condition of rapid load change, and also provides theoretical basis for further research.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM621
本文編號：2195496
[Abstract]:With the development of renewable energy, the challenge of peak-shaving in power grid is increasing. It is inevitable for large thermal power units to participate in peak-shaving, and their peak load response speed is also an important index to assess the capacity of generating units to respond to load. At present, there is no clear criterion to measure the compensation for peak shaving and the degree of equipment damage in the discussion of the division between paid and unpaid peak-shaving. In this paper, the vibration characteristics of the axial flow fan of thermal power unit boiler are discussed when the load changes rapidly during the peaking process. By collecting the field fan vibration data of thermal power units, the qualitative conclusion is drawn that the vibration characteristics of fans show different amplitudes with the varying amplitude of unit load and varying speed. After quantitative analysis, the rotor component model of the fan is established, and the dynamic response of the blade under different load changes is calculated. The analysis includes modal analysis, harmonic response analysis and transient excitation response analysis of fan blade. Modal analysis is used to evaluate the resonance state of fan, harmonic response analysis is used to draw stress, deformation frequency response curve, and transient excitation response to discuss the difference of vibration parameters of fan blade under different load changing speed and different load change amplitude. Firstly, the axial fan model and the flow channel model are established through the field measurement data. Then the flow field of the fan is numerically simulated by CFD software Fluent, which simplifies the calculation of the torque acting on the main shaft of the fan as the load to calculate the fluid-induced vibration. The vibration characteristics of the fan under three different working conditions (BMCR / TB / tha) are discussed. It is concluded that the larger the load variation amplitude, the larger the vibration overshoot, the longer the attenuation period, the more difficult to reach the stable state. When the load of the unit changes rapidly, the vibration overshoot of the system is large and the attenuation period is long, so it is more difficult to reach the stable state. Through comparison and analysis, it is proved that thermal power unit has certain influence on the working state of axial flow induced fan of boiler auxiliary machine when participating in AGC peaking. The vibration characteristics of fan blade are different with the depth and speed of peak shaving. This conclusion reminds the power plant staff to pay attention to the working state of auxiliary machines when the units participate in the paid peak-shaving. It is necessary to make a comprehensive consideration by comparing the interests of participating in the peak-shaving compensation of power grid and the damage of auxiliary machines. At the same time, this paper also serves as the reference direction for further calculation of the life of fan under the condition of rapid load change, and also provides theoretical basis for further research.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM621
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