【摘要】：風(fēng)機(jī)是工、農(nóng)業(yè)生產(chǎn)中發(fā)揮重要作用的通用機(jī)械，數(shù)量極其龐大，耗能十分可觀，具有相當(dāng)大的的節(jié)能潛力。因此，研究風(fēng)機(jī)的節(jié)能降耗問題，對“節(jié)能減排”具有十分重要的意義。 在火力發(fā)電廠中，主要輔機(jī)的經(jīng)濟(jì)運(yùn)行直接關(guān)系到廠用電率的高低，而廠用電率的高低又是影響發(fā)電成本和供電煤耗的重要因素。風(fēng)機(jī)作為電站鍋爐的主要輔機(jī)，其電耗占廠用電的30%左右，因此開展電廠風(fēng)機(jī)的經(jīng)濟(jì)運(yùn)行、節(jié)能研究很有必要。 本文以吉林省某熱電廠200MW機(jī)組的680t/h鍋爐為例，對相應(yīng)的兩類引風(fēng)機(jī)進(jìn)行數(shù)值模擬與節(jié)能降耗改造研究。首先利用Pro/E軟件對離心通風(fēng)機(jī)和軸流通風(fēng)機(jī)的整機(jī)內(nèi)部流動進(jìn)行三維流場建立模型；然后在專門的網(wǎng)格劃分軟件GAMBIT中對兩個風(fēng)機(jī)的三維流場模型進(jìn)行網(wǎng)格劃分和邊界條件設(shè)置；最后采用CFD商業(yè)軟件FLUENT，利用標(biāo)準(zhǔn)k-ε模型、分離隱式求解器分別對兩個風(fēng)機(jī)模型進(jìn)行數(shù)值模擬并分析了數(shù)值模擬結(jié)果。通過對整機(jī)內(nèi)部及出口流場的研究，，分析出流體在通風(fēng)機(jī)內(nèi)部及出口的速度矢量分布和壓力分布，進(jìn)行離心式通風(fēng)機(jī)和軸流式通風(fēng)機(jī)流場對比分析，為該電廠風(fēng)機(jī)的節(jié)能改造提供了理論依據(jù)。最后以該電廠一臺機(jī)組引風(fēng)機(jī)系統(tǒng)為例進(jìn)行節(jié)能降耗改造和試驗(yàn)研究，改造后引風(fēng)機(jī)單位電耗降低了1.25kW·h/t，并且為同等類型的火力發(fā)電機(jī)組風(fēng)機(jī)節(jié)能改造提供參考。
[Abstract]:Fan is a kind of general machinery which plays an important role in agricultural production. Therefore, it is of great significance to study the energy saving and consumption reduction of fan. In the thermal power plant, the economic operation of the main auxiliary machine is directly related to the power consumption rate, and the power consumption rate is an important factor affecting the generation cost and coal consumption. Fan is the main auxiliary machine of boiler in power station, and its electricity consumption is about 30% of the total power consumption. Therefore, it is necessary to carry out economic operation of fan in power plant and study on energy saving. Taking the 680t/h boiler of the 200MW unit of a thermal power plant in Jilin Province as an example, the numerical simulation of two kinds of induced fans and the retrofit of saving energy and reducing consumption are carried out in this paper. Firstly, the three-dimensional flow field model of centrifugal fan and axial fan is established by using Pro/E software. Then, the 3D flow field model of two fans is meshed and the boundary conditions are set in the special meshing software GAMBIT. Finally, using the standard k- 蔚 model and the CFD commercial software FLUENT, two fan models are numerically simulated and the numerical simulation results are analyzed. Through the study of the flow field inside and out of the whole machine, the velocity vector distribution and pressure distribution of the fluid inside and out of the fan are analyzed, and the flow field of centrifugal fan and axial flow fan is compared and analyzed. It provides a theoretical basis for the retrofit of fan energy saving in this power plant. Finally, taking the fan system of one unit of the power plant as an example, the energy saving and consumption reduction is carried out. After the transformation, the unit power consumption of the induced fan is reduced and the 1.25kW h / t is reduced, which provides a reference for the energy saving transformation of the same type of thermal power generating unit fan.
【學(xué)位授予單位】：東北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH43

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相關(guān)期刊論文 前10條

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