本文選題：吸收塔脫硫泵 + 設(shè)計(jì)方法�。� 參考：《江蘇大學(xué)》2014年博士論文

【摘要】：本課題是國家科技支撐計(jì)劃項(xiàng)目“典型離心泵關(guān)鍵技術(shù)研究及工程示范應(yīng)用”課題(項(xiàng)目編號：2011BAF14800)及江蘇省科技支撐(工業(yè))計(jì)劃項(xiàng)目“火電廠大型系列煙氣脫硫吸收塔循環(huán)泵關(guān)鍵技術(shù)開發(fā)與應(yīng)用”課題(項(xiàng)目編號：BE2011141)的主要研究內(nèi)容之一。 火電機(jī)組吸收塔脫硫泵廣泛地應(yīng)用于火電廠、石油、化工等重要行業(yè),火電機(jī)組吸收塔脫硫泵的開發(fā)及推廣應(yīng)用,對減少火電廠排放的二氧化硫污染,治理環(huán)境具有重要的現(xiàn)實(shí)意義及顯著的經(jīng)濟(jì)和社會(huì)效益。因此,對火電機(jī)組吸收塔脫硫泵的設(shè)計(jì)方法與理論進(jìn)行研究,從泵內(nèi)部流場進(jìn)行分析,旨在開發(fā)出高效的水力模型,提出創(chuàng)新結(jié)構(gòu)設(shè)計(jì)方案,提高機(jī)組的效率及運(yùn)行的可靠性,為吸收塔脫硫泵優(yōu)化設(shè)計(jì)提供依據(jù)。主要研究工作及創(chuàng)造性成果有： (1)從設(shè)計(jì)理論、試驗(yàn)研究、數(shù)值仿真計(jì)算和綜合研究等方面概括論述了目前國內(nèi)外液固兩相流理論與液固兩相流泵的研究現(xiàn)狀,對葉片機(jī)械數(shù)值模擬方法研究進(jìn)行了簡要介紹,分析了火電機(jī)組吸收塔脫硫泵的發(fā)展及趨勢。對數(shù)值模擬計(jì)算所涉及到的不可壓縮的粘性流體的納維-斯托克斯方程進(jìn)行了分析,研究并選擇了模擬計(jì)算所需要的數(shù)學(xué)模型。 (2)借助液固兩相流泵的設(shè)計(jì)理論對火電機(jī)組吸收塔脫硫泵的設(shè)計(jì)方法進(jìn)行了探討,借鑒速度系數(shù)法對2種規(guī)格火電機(jī)組吸收塔脫硫泵產(chǎn)品進(jìn)行了創(chuàng)新設(shè)計(jì)。引入了基于貝塞爾曲線的葉片極大扭曲結(jié)構(gòu)設(shè)計(jì)方法,極大扭曲葉片減少了能量損失,提高了泵的水力性能；葉輪進(jìn)口處葉片超長延伸的設(shè)計(jì)方法提高了泵的效率,降低了運(yùn)行成本；設(shè)計(jì)的葉輪背葉片有效平衡了軸向力；脫硫泵的葉輪和泵體之間設(shè)計(jì)了自動(dòng)補(bǔ)償葉輪間隙的裝置及葉輪軸向位移調(diào)節(jié)裝置,保證了泵在高效區(qū)運(yùn)行。 (3)對TLB600-700型脫硫泵分別進(jìn)行了以清水為介質(zhì)的單相流場、以含有石灰石顆粒的溶液為介質(zhì)的液固兩相流場的數(shù)值模擬。結(jié)果表明,泵內(nèi)流場的流動(dòng)規(guī)律比較好,驗(yàn)證了水力設(shè)計(jì)方案的可行性,并預(yù)測了輸送清水時(shí)泵的外特性曲線。分析了輸送液固兩相流時(shí),顆粒物參數(shù)對泵性能的影響,對脫硫泵的主要過流部件進(jìn)行了分析,預(yù)測了葉輪及壓水室的主要磨損位置。通過三維非定常數(shù)值模擬計(jì)算,初步揭示了TLB600-700型脫硫泵內(nèi)部三維流場由于旋轉(zhuǎn)的葉輪和壓水室之間的動(dòng)靜干涉作用引起的壓力脈動(dòng)特性。 (4)采用ANASYS軟件對2種規(guī)格火電機(jī)組吸收塔脫硫泵的葉輪進(jìn)行了流固耦合分析,揭示了脫硫泵葉輪上應(yīng)力分布密集的區(qū)域出現(xiàn)位置,以及葉輪上的變形量最大的位置和形變分布情況。最后,對2種規(guī)格火電機(jī)組吸收塔脫硫泵樣機(jī)進(jìn)行了外特性測試,試驗(yàn)結(jié)果表明,采用創(chuàng)新方法設(shè)計(jì)的2種規(guī)格脫硫泵樣機(jī)設(shè)計(jì)合理,設(shè)計(jì)方法可靠,高效率區(qū)較寬,額定點(diǎn)效率比國家標(biāo)準(zhǔn)分別提高了3.78個(gè)百分點(diǎn)和4.15個(gè)百分點(diǎn)。 (5)將數(shù)值模擬結(jié)果與試驗(yàn)結(jié)果進(jìn)行了對比分析,結(jié)果表明數(shù)值模擬比較準(zhǔn)確地反應(yīng)了泵內(nèi)流場的流動(dòng)情況,證明通過試驗(yàn)與數(shù)值模擬結(jié)合的方法提高火電機(jī)組吸收塔脫硫泵效率的可行性,為火電機(jī)組吸收塔脫硫泵系列產(chǎn)品的設(shè)計(jì)開發(fā)與理論研究提供了技術(shù)支持,大幅度縮短了設(shè)計(jì)周期,簡化了理論計(jì)算的繁瑣過程。
[Abstract]:This project is the subject of national science and technology support program "key technology research and engineering demonstration application of typical centrifugal pump" (project number: 2011BAF14800) and Jiangsu science and technology support (industry) project "development and application of key technology of circulating pump for large series flue gas desulfurization absorption tower of thermal power plant" (project number: BE2011141) One of the main contents of the study.
The desulfurization pump of the absorption tower of thermal power unit is widely used in the important industries, such as thermal power plant, oil and chemical industry, and the development and application of desulfurization pump for the absorption tower of thermal power unit. It has important practical significance and remarkable economic and social benefit to reduce the pollution of sulfur dioxide emitted by thermal power plants and control the environment. Therefore, desulfurization of the absorption tower of thermal power unit The design method and theory of the pump are studied. From the flow field of the pump, an efficient hydraulic model is developed and an innovative design scheme is proposed to improve the efficiency of the unit and the reliability of the operation. The main research work and creative achievements are as follows:
(1) from the aspects of design theory, experimental research, numerical simulation calculation and comprehensive research, the current research status of liquid solid two-phase flow theory and liquid solid two phase flow pump at home and abroad is summarized, and the research on the numerical simulation method of blade mechanical simulation is briefly introduced, and the development and trend of the desulfurization pump of the absorption tower of the fire motor group are analyzed. The Navier Stokes equation of the incompressible viscous fluid involved in the calculation is analyzed, and the mathematical model needed for the simulation calculation is studied and chosen.
(2) by means of the design theory of liquid solid two phase flow pump, the design method of the desulfurization pump for the absorption tower of the thermal power unit is discussed. By using the speed coefficient method, the product of the desulfurization pump of the absorption tower of the 2 kinds of thermal power units is innovating. The design method of the maximum twisted blade structure based on the Bessel curve is introduced, and the greatly twisted blade reduces the energy. The hydraulic performance of the pump is improved. The design method of the blade's ultra long extension at the inlet of the impeller improves the efficiency of the pump and reduces the operating cost. The designed impeller back blade is effective in balancing the axial force; the impeller and the pump body of the desulfurization pump are designed to automatically compensate the clearance of the impeller and the axial displacement regulating device of the impeller. It is proved that the pump runs in the high efficiency area.
(3) the single phase flow field of TLB600-700 type desulfurization pump was carried out with clear water as the medium. The numerical simulation of the liquid solid two phase flow field with the solution of limestone particles was used. The results showed that the flow law of the inner flow field was better, the feasibility of the hydraulic design scheme was verified, and the external characteristic curve of the pump was predicted. The effect of the particle parameters on the pump performance is analyzed. The main flow parts of the desulfurization pump are analyzed. The main wear position of the impeller and the pressure water chamber is predicted. The three-dimensional flow field in the inner part of the TLB600-700 type desulfurization pump is preliminarily revealed by the three-dimensional unsteady numerical simulation. The characteristics of pressure fluctuation caused by dynamic and static interference.
(4) the ANASYS software is used to analyze the flow and solid coupling analysis of the impeller of the desulfurization pump of the 2 kinds of thermal power unit absorption tower. The location of the area where the stress distribution is dense on the impeller of the desulfurization pump, the maximum position of the deformation on the impeller and the distribution of the deformation are revealed. Finally, the prototype of the desulfurization pump for the absorption tower of 2 kinds of thermal power units is carried out. The test results show that the design of 2 types of desulfurization pump prototype designed by innovation method is reasonable, the design method is reliable, the high efficiency area is wide and the fixed point efficiency is increased by 3.78 percentage points and 4.15 percentage points compared with the national standard respectively.
(5) the numerical simulation results are compared with the test results. The results show that the numerical simulation accurately reflects the flow of the internal flow field in the pump, and proves the feasibility of improving the efficiency of the desulfurization pump in the absorption tower of the thermal power unit through the combination of the test and numerical simulation, and the design of the series products of the desulfurization pump for the absorption tower of the thermal power unit. The research provides technical support for theoretical research and greatly shortens the design cycle and simplifies the tedious process of theoretical calculation.
【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：X773

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