【摘要】：在我國有大量的風(fēng)機(jī)設(shè)備應(yīng)用在整個(gè)火力發(fā)電機(jī)組中,引風(fēng)機(jī)是把燃料燃燒后所生成的煙氣從鍋爐中抽出,并排入大氣。其主要輸送含有灰渣、飛灰和含焦油狀態(tài)餾分的煙氣,而且溫度較高,相對于其他風(fēng)機(jī)其工作環(huán)境較為復(fù)雜,風(fēng)機(jī)的運(yùn)行情況也與常規(guī)風(fēng)機(jī)有所不同,因此對于長期處于高溫?zé)煔猸h(huán)境下工作的引風(fēng)機(jī)運(yùn)行特性進(jìn)行研究,分析煙氣溫度對風(fēng)機(jī)性能參數(shù)的影響,把握高溫環(huán)境下引風(fēng)機(jī)運(yùn)行特性的規(guī)律,具有極高的現(xiàn)實(shí)意義和工程價(jià)值。本文以某2%s600MW燃煤電廠所應(yīng)用的AP系單級動葉可調(diào)軸流引風(fēng)機(jī)為研究對象,利用計(jì)算流體力學(xué)手段,對該風(fēng)機(jī)建模后進(jìn)行數(shù)值模擬,分別比較不同煙氣溫度下風(fēng)機(jī)運(yùn)行特性、氣動噪聲以及葉片磨損情況,進(jìn)而分析高溫?zé)煔猸h(huán)境下引風(fēng)機(jī)運(yùn)行的特點(diǎn),最后針對高溫?zé)煔猸h(huán)境,對引風(fēng)機(jī)性能影響較大的葉頂間隙進(jìn)行探討,分析不同葉頂間隙下風(fēng)機(jī)性能以及機(jī)理。得到結(jié)論如下:(1)對不同的進(jìn)口煙氣溫度下引風(fēng)機(jī)運(yùn)行的流場分布進(jìn)行數(shù)值模擬,可以發(fā)現(xiàn)隨著煙氣溫度的升高,引風(fēng)機(jī)全壓明顯降低,引風(fēng)機(jī)能量損失增大;在引風(fēng)機(jī)葉片壓力面形成明顯的高壓區(qū)并隨溫度升高,高壓區(qū)域逐漸變小;煙氣流速逐漸增大,相鄰葉片之間流場相互影響增強(qiáng);引風(fēng)機(jī)噪聲大小隨煙氣溫度的變化并未有較大的變化,但隨著煙氣溫度的升高,其噪聲主要以漩渦噪聲為主,噪聲源位置逐漸向葉頂部位移動。(2)在前文模擬的基礎(chǔ)上,添加固體顆粒模型,分析高溫?zé)煔猸h(huán)境下引風(fēng)機(jī)的葉片磨損情況,得出隨著煙氣溫度的增大,引風(fēng)機(jī)葉片磨損情況逐漸嚴(yán)重,且引風(fēng)機(jī)葉片的磨損主要集中在葉片壓力面靠近葉跟的下半部分,磨損最嚴(yán)重的區(qū)域出現(xiàn)在葉片壓力面中部的前緣位置。(3)針對引風(fēng)機(jī)實(shí)際工作的高溫?zé)煔猸h(huán)境,對引風(fēng)機(jī)性能參數(shù)影響較大的葉頂間隙進(jìn)行模擬分析,得到高溫?zé)煔猸h(huán)境下,葉頂間隙增大,引風(fēng)機(jī)全壓減小;葉頂泄漏增強(qiáng)并形成泄漏渦,渦首先在葉片吸力面形成逐漸向葉片前緣以及壓力面移動;引風(fēng)機(jī)噪聲不斷增大,葉片磨損也不斷嚴(yán)重。通過以上分析研究,較為全面的得到了高溫?zé)煔猸h(huán)境下電廠軸流引風(fēng)機(jī)的運(yùn)行特性及特點(diǎn)規(guī)律,對于實(shí)際中的風(fēng)機(jī)改造及理論研究提供了一定的研究基礎(chǔ)。
[Abstract]:In our country, a large number of fan equipments are used in the whole thermal power generating unit. The induced fan is to draw the flue gas from the boiler after burning the fuel and then discharge it into the atmosphere. It mainly conveys flue gas containing ash, fly ash and tar state fraction, and its temperature is higher, compared with other fans, its working environment is more complex, and the operation of fan is different from that of conventional fan. Therefore, the operating characteristics of the induced fan working in the high temperature smoke environment for a long time are studied, the influence of flue gas temperature on the performance parameters of the fan is analyzed, and the law of the operating characteristics of the induced fan under the high temperature environment is grasped. Has the extremely high realistic significance and the engineering value. In this paper, the single stage adjustable axial fan of AP system used in a 2%s600MW coal-fired power plant is taken as the research object. By means of computational fluid dynamics, numerical simulation is carried out on the fan after modeling, and the operating characteristics of the fan under different flue gas temperature are compared respectively. The aerodynamic noise and blade wear are analyzed, and the characteristics of induced fan operation in high temperature flue gas environment are analyzed. Finally, the blade top clearance which has great influence on the performance of induced fan is discussed in the high temperature flue gas environment. The performance and mechanism of fan under different blade top clearance are analyzed. The conclusions are as follows: (1) numerical simulation of the flow field distribution of the induced fan under different inlet flue gas temperature shows that with the increase of the flue gas temperature, the total pressure of the induced fan decreases obviously, and the energy loss of the induced fan increases; An obvious high pressure area is formed on the blade pressure surface of the induced fan and the high pressure area becomes smaller with the increase of temperature, and the flue gas velocity increases gradually, and the flow field interaction between adjacent blades increases. The noise of induced fan does not change greatly with flue gas temperature, but with the increase of flue gas temperature, the noise is mainly whirlpool noise, and the position of noise source gradually moves to the top of the blade. (2) on the basis of the previous simulation, Adding solid particle model, the blade wear of induced fan under high temperature smoke environment is analyzed. It is concluded that with the increase of flue gas temperature, the wear situation of induced fan blade becomes more and more serious. Moreover, the wear of the induced fan blade is mainly concentrated in the lower part of the blade pressure surface near the lower part of the blade heel, and the most serious area appears in the leading edge position in the middle of the blade pressure surface. (3) aiming at the high temperature flue gas environment of the actual work of the induced fan, Based on the simulation and analysis of the blade tip clearance which has a great influence on the performance parameters of the induced fan, it is found that under the high temperature flue gas environment, the tip clearance increases, the total pressure of the induced fan decreases, the leakage at the top of the blade increases and the leakage vortex forms. Firstly, the vortex gradually moves to the front edge of the blade and the pressure surface in the suction surface of the blade, and the noise of the induced fan increases and the wear of the blade becomes more serious. Through the above analysis and research, the operating characteristics and characteristics of axial flow induced fans in power plant under high temperature flue gas environment are obtained, which provides a certain research basis for the actual fan transformation and theoretical research.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM621.7

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