本文關(guān)鍵詞：大型動葉可調(diào)軸流風(fēng)機(jī)數(shù)值模擬與實際工況比較研究　出處：《華北電力大學(xué)（北京）》2011年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 軸流風(fēng)機(jī) 運(yùn)行工況 數(shù)值模擬 比較研究

【摘要】：軸流式通風(fēng)機(jī)廣泛應(yīng)用于礦山、冶金、電力等行業(yè),是其通風(fēng)給風(fēng)系統(tǒng)的最主要設(shè)備,相比離心式通風(fēng)機(jī),其最大的特點(diǎn)是流量大、壓頭低。目前,600MW發(fā)電機(jī)組已成為火力發(fā)電廠的主力機(jī)組,并且有向1000MW發(fā)展的趨勢,隨著單機(jī)容量的不斷增大,離心通風(fēng)機(jī)在尺寸、重量等方面的缺點(diǎn)越來越明顯,采用軸流通風(fēng)機(jī)成為必然。并且隨著電網(wǎng)峰谷變化,要求大部分火電廠均需承擔(dān)調(diào)峰作用,動葉可調(diào)軸流風(fēng)機(jī)應(yīng)用越來越多。因此,研究其性能,對節(jié)能降耗有很重要的意義。 本文首先對電廠脫硫增壓風(fēng)機(jī)的運(yùn)行工況進(jìn)行了分析,從其實際運(yùn)行工況出發(fā),分析了其安全裕量、實際運(yùn)行效率等表示風(fēng)機(jī)性能的重要參數(shù),找出其運(yùn)行中存在的主要問題,并提出了相應(yīng)的建議,對電廠節(jié)能降耗有重要的借鑒意義。 然后根據(jù)實測的該軸流風(fēng)機(jī)的幾何尺寸,經(jīng)三維坐標(biāo)轉(zhuǎn)換后在Fluent前處理軟件GAMBIT中進(jìn)行建模和網(wǎng)格劃分,確定計算域和設(shè)置邊界條件,將網(wǎng)格文件導(dǎo)入Fluent軟件,求解器采用基于壓力的非耦合隱式求解器,模擬出軸流風(fēng)機(jī)的內(nèi)部流場。通過改變風(fēng)機(jī)的性能參數(shù)和結(jié)構(gòu)參數(shù),例如風(fēng)機(jī)的流量、葉輪轉(zhuǎn)速、葉片安裝角,分別進(jìn)行模擬,并對其流動特性進(jìn)行分析。結(jié)果表明數(shù)值模擬能較好的反應(yīng)流體的真實流動情況,對應(yīng)工況模擬計算和實際運(yùn)行參數(shù)吻合較好,這對縮短風(fēng)機(jī)產(chǎn)品研發(fā)的周期以及降低研發(fā)成本有重要意義。
[Abstract]:Axial flow fan is widely used in mining, metallurgy, electric power and other industries. It is the main equipment of its ventilation and air supply system. Compared with centrifugal fan, its biggest characteristic is high flow rate and low pressure head. 600MW generating set has become the main unit of thermal power plant, and has the trend of development to 1000MW. With the increasing of single unit capacity, the size of centrifugal fan is in size. The disadvantages of weight are becoming more and more obvious, so it is necessary to adopt axial flow fan, and with the change of power network peak and valley, most thermal power plants are required to take the peak-shaving role. The adjustable axial flow fan with moving blade is applied more and more, so it is very important to study its performance to save energy and reduce consumption. In this paper, the operation condition of desulfurization and pressurized fan in power plant is analyzed, and the important parameters such as safety margin and actual operation efficiency are analyzed. The main problems in operation are found out, and the corresponding suggestions are put forward, which is of great significance for energy saving and consumption reduction in power plants. Then according to the measured geometric size of the axial flow fan, the 3D coordinate transformation is carried out in the Fluent pre-processing software GAMBIT to model and mesh, to determine the calculation area and set the boundary conditions. The grid file is imported into Fluent software and the non-coupled implicit solver based on pressure is used to simulate the internal flow field of the axial fan. The performance parameters and structure parameters of the fan are changed. For example, the fan flow rate, impeller speed, blade installation angle are simulated, and its flow characteristics are analyzed. The results show that the numerical simulation can better the real flow of reaction fluid. The simulation and calculation of the corresponding operating conditions are in good agreement with the actual operating parameters, which is of great significance to shorten the cycle of the research and development of fan products and to reduce the R & D cost.
【學(xué)位授予單位】：華北電力大學(xué)（北京）
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH432.1

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