發(fā)布時間：2018-07-31 09:13

【摘要】：在我國有大量的風機設備應用在整個火力發(fā)電機組中,引風機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,相對于其他風機其工作環(huán)境較為復雜,風機的運行情況也與常規(guī)風機有所不同,因此對于長期處于高溫煙氣環(huán)境下工作的引風機運行特性進行研究,分析煙氣溫度對風機性能參數(shù)的影響,把握高溫環(huán)境下引風機運行特性的規(guī)律,具有極高的現(xiàn)實意義和工程價值。本文以某2%s600MW燃煤電廠所應用的AP系單級動葉可調軸流引風機為研究對象,利用計算流體力學手段,對該風機建模后進行數(shù)值模擬,分別比較不同煙氣溫度下風機運行特性、氣動噪聲以及葉片磨損情況,進而分析高溫煙氣環(huán)境下引風機運行的特點,最后針對高溫煙氣環(huán)境,對引風機性能影響較大的葉頂間隙進行探討,分析不同葉頂間隙下風機性能以及機理。得到結論如下:(1)對不同的進口煙氣溫度下引風機運行的流場分布進行數(shù)值模擬,可以發(fā)現(xiàn)隨著煙氣溫度的升高,引風機全壓明顯降低,引風機能量損失增大;在引風機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;引風機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)在前文模擬的基礎上,添加固體顆粒模型,分析高溫煙氣環(huán)境下引風機的葉片磨損情況,得出隨著煙氣溫度的增大,引風機葉片磨損情況逐漸嚴重,且引風機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)針對引風機實際工作的高溫煙氣環(huán)境,對引風機性能參數(shù)影響較大的葉頂間隙進行模擬分析,得到高溫煙氣環(huán)境下,葉頂間隙增大,引風機全壓減小;葉頂泄漏增強并形成泄漏渦,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;引風機噪聲不斷增大,葉片磨損也不斷嚴重。通過以上分析研究,較為全面的得到了高溫煙氣環(huán)境下電廠軸流引風機的運行特性及特點規(guī)律,對于實際中的風機改造及理論研究提供了一定的研究基礎。
[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.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM621.7

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本文編號：2155118