本文關(guān)鍵詞： D型鍋爐 管束振動 熱力計(jì)算 應(yīng)力分析 數(shù)值模擬 卡門渦街　出處：《江蘇科技大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著機(jī)組向大容量、高性能發(fā)展,鍋爐運(yùn)行過程中的振動現(xiàn)象越來越普遍。特別是在變負(fù)荷下運(yùn)行時(shí),鍋爐特別是爐膛內(nèi)部的速度、溫度及壓力變化會帶來管束振動變得更加嚴(yán)重。因此,分析鍋爐的對流管束振動問題變得非常有意義且有應(yīng)用價(jià)值。本文以某大容量D型鍋爐為研究對象,針對其對流區(qū)管束的結(jié)構(gòu)靜強(qiáng)度及卡門渦街振動問題進(jìn)行了深入的研究。首先,論述了D型鍋爐總體布置和結(jié)構(gòu)設(shè)計(jì)上的特點(diǎn),并對D型鍋爐的不同負(fù)荷工況進(jìn)行了熱力計(jì)算。然后,對D型鍋爐對流管束的簡化模型進(jìn)行了有限元應(yīng)力分析,結(jié)果表明其結(jié)構(gòu)強(qiáng)度能夠滿足鍋爐受壓元件的設(shè)計(jì)要求。接著,采用數(shù)值方法模擬了D型鍋爐煙道內(nèi)煙氣流動狀況,并據(jù)此完成了D型鍋爐在不同工況下對流管束后卡門渦街脫落頻率數(shù)值模擬計(jì)算,進(jìn)而采用快速傅里葉變換得到了對流管束的升力系數(shù)和頻譜特性曲線。通過對比分析得出如下兩點(diǎn)結(jié)論:(1)卡門渦街脫落頻率的數(shù)值模擬結(jié)果與傳統(tǒng)卡門渦街理論的計(jì)算結(jié)果變化趨勢相同,數(shù)值趨于相近。(2)煙氣來流速度增大,卡門渦街脫落頻率也略有增長,形成卡門渦街振動的部位高度略有下降。本文的研究表明,相比傳統(tǒng)經(jīng)驗(yàn)計(jì)算,利用數(shù)值模擬計(jì)算得到的卡門渦街脫落頻率結(jié)果更能準(zhǔn)確地判斷鍋爐管束區(qū)卡門渦街誘導(dǎo)振動的部位,對指導(dǎo)鍋爐工程設(shè)計(jì)更有價(jià)值。
[Abstract]:With the development of large capacity and high performance, the vibration phenomenon in boiler operation is becoming more and more common, especially the speed of boiler, especially in furnace. The change of temperature and pressure will make the vibration of tube bundle more serious. Therefore, it is very meaningful and valuable to analyze the vibration of convection tube bundle of boiler. In this paper, a large capacity D type boiler is taken as the research object. The static strength of the tube bundle and the vibration of the Karman vortex street in the convection zone are studied. Firstly, the characteristics of the general layout and structure design of the D type boiler are discussed. The thermal calculation of D type boiler under different load conditions is carried out. Then, the finite element stress analysis of the simplified model of convection tube bundle of D type boiler is carried out. The results show that the structural strength can meet the design requirements of the boiler pressure element. Then, the flue gas flow in the flue of D type boiler is simulated by numerical method. According to this, the numerical simulation of Karman vortex shedding frequency after convection tube bundle of D type boiler under different working conditions has been completed. Then the lift coefficient and spectrum characteristic curve of convection tube bundle are obtained by using fast Fourier transform. The numerical simulation results of Karman vortex shedding frequency are the same as those of traditional Carmen vortex theory. The numerical value tends to be similar. 2) the velocity of flue gas flow increases, the frequency of Karman vortex shedding increases slightly, and the height of the position where the vibration of Carmen vortex decreases slightly. The research in this paper shows that compared with the traditional empirical calculation. The frequency of Karman vortex shedding obtained by numerical simulation can more accurately judge the location of vibration induced by Carmen vortex in boiler tube bundle area, which is more valuable for guiding boiler engineering design.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TK227

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