【摘要】：本文以某電廠600MW混流式脫硫漿液循環(huán)泵為研究對象,由于其出力和效率達(dá)不到電廠脫硫要求,故對其進(jìn)行增容改造。由于漿液泵改造設(shè)計復(fù)雜,故需綜合考慮多方因素,在泵理論性能研究的基礎(chǔ)上,探尋最優(yōu)改造方案,本文主要通過適當(dāng)增大葉輪出口直徑、出口安放角和包角,來提高泵的揚程和流量,從而提高電廠脫硫效率。 利用Pro/E三維建模軟件分別對改造前、后的泵進(jìn)行三維建模。運用Gambit軟件對流道進(jìn)行網(wǎng)格劃分,并結(jié)合數(shù)值模擬軟件FLUENT6.2,分別選用Euler多相流模型、標(biāo)準(zhǔn)的k-ε湍流模型和SIMPLEC算法,對改造前、后泵內(nèi)固液兩相流流場進(jìn)行數(shù)值模擬。通過固液兩相流流場的速度分布、壓力分布和固體顆粒濃度分布情況,研究改造前后泵性能的改變。模擬結(jié)果顯示,改造后脫硫漿液泵揚程、流量和脫硫效率都增大。雖然改造后脫硫漿液泵葉輪和蝸殼隔舌處磨損程度有所增加,但是,內(nèi)部流場分布合理,整體運行穩(wěn)定性較好,葉片壓力分布趨于均勻,泵的抗汽蝕性能有所提高。據(jù)現(xiàn)場測量結(jié)果顯示,改造后泵的出力和脫硫效率都得到了很大提高。數(shù)值模擬與現(xiàn)場測量結(jié)果吻合,由此可見,在模型選取合理的前提下,數(shù)值模擬對泵性能的研究和工程實際改造具有一定的預(yù)測和指導(dǎo)作用。
[Abstract]:In this paper, the 600MW mixed flow desulphurization slurry circulating pump in a power plant is taken as the research object. Because its output and efficiency can not meet the desulphurization requirements of the power plant, its capacity enhancement and transformation are carried out. Because of the complexity of the revamping design of the slurry pump, it is necessary to consider many factors synthetically. On the basis of the study of the theoretical performance of the pump, the optimal transformation scheme is explored. In this paper, the lift and flow rate of the pump are improved by properly increasing the outlet diameter, outlet placement angle and inclusion angle of the impeller, so as to improve the desulphurization efficiency of the power plant. The three-dimensional modeling of the pump before and after the transformation is carried out by using Pro/E three-dimensional modeling software. The flow channel is meshed by Gambit software, and the Euler multiphase flow model, standard k-蔚 turbulence model and SIMPLEC algorithm are selected to simulate the solid-liquid two-phase flow field in the pump before and after the revamping. Through the velocity distribution, pressure distribution and solid particle concentration distribution of solid-liquid two-phase flow field, the change of pump performance before and after revamping is studied. The simulation results show that the head, flow rate and desulphurization efficiency of desulphurization slurry pump increase after revamping. Although the wear degree of impeller and volute tongue of desulphurization slurry pump increases after revamping, the internal flow field distribution is reasonable, the overall operation stability is good, the pressure distribution of blade tends to be uniform, and the cavitation resistance of the pump is improved. According to the field measurement results, the output and desulphurization efficiency of the modified pump have been greatly improved. The numerical simulation is in good agreement with the field measurement results. It can be seen that the numerical simulation can predict and guide the pump performance research and engineering transformation on the premise of reasonable model selection.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH311

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