本文選題：閃蒸干燥機(jī) + 動(dòng)力學(xué)　； 參考：《東北大學(xué)》2014年碩士論文

【摘要】：旋轉(zhuǎn)閃蒸干燥機(jī)具有結(jié)構(gòu)簡(jiǎn)單、干燥時(shí)間短、物料溫升低、適用特殊物料干燥等特點(diǎn),在傳統(tǒng)的旋轉(zhuǎn)閃蒸干燥機(jī)的基礎(chǔ)上增加旋轉(zhuǎn)分散裝置(分級(jí)輪),能很好的解決產(chǎn)品的再次團(tuán)聚問題,提高分散能力,保證干燥產(chǎn)品達(dá)到一定的粒度要求。分級(jí)輪是在高轉(zhuǎn)速及中高溫的環(huán)境下工作,結(jié)構(gòu)上位于立筒式干燥室的頂端,其振動(dòng)會(huì)很大程度上影響到整個(gè)機(jī)體的穩(wěn)定性,嚴(yán)重時(shí)甚至不能正常工作。所以針對(duì)該轉(zhuǎn)子系統(tǒng)進(jìn)行了動(dòng)力學(xué)特性的分析和分級(jí)輪與熱流體的耦合作用分析,判斷出該分級(jí)輪系統(tǒng)不能滿足正常的工作需求,需要做出調(diào)整或優(yōu)化。首先,選用離散質(zhì)量模型和有限元兩種方法對(duì)分級(jí)輪進(jìn)行了轉(zhuǎn)子動(dòng)力學(xué)的特性分析,特別是考慮了陀螺效應(yīng)對(duì)高速轉(zhuǎn)子的影響,經(jīng)過相互驗(yàn)證發(fā)現(xiàn)數(shù)學(xué)模型對(duì)高階模態(tài)有較大誤差,而有限元法則對(duì)分級(jí)輪籠式結(jié)構(gòu)有較好的模擬結(jié)果。其次,通過模態(tài)分析及諧響應(yīng)分析驗(yàn)證了轉(zhuǎn)子的工作轉(zhuǎn)速小于但很接近其一階臨界轉(zhuǎn)速,瞬態(tài)不平衡響應(yīng)分析也顯示了在轉(zhuǎn)子啟動(dòng)過程中接近工作轉(zhuǎn)速時(shí)振動(dòng)急劇增大到很大的位移值,所以為了避免過大振動(dòng),應(yīng)該對(duì)轉(zhuǎn)子系統(tǒng)進(jìn)行調(diào)整優(yōu)化。同時(shí),本文分析并得到了干燥室內(nèi)的熱氣流與分級(jí)輪之間的相互影響,以及分級(jí)輪轉(zhuǎn)速對(duì)物料顆粒逸出率的影響關(guān)系。最后,通過熱-結(jié)構(gòu)耦合分析對(duì)分級(jí)輪結(jié)構(gòu)強(qiáng)度的驗(yàn)證和流場(chǎng)壓力對(duì)輪盤結(jié)構(gòu)的影響,選擇提高轉(zhuǎn)子系統(tǒng)臨界轉(zhuǎn)速的方案對(duì)其進(jìn)行結(jié)構(gòu)優(yōu)化,并得到了滿意的結(jié)果。
[Abstract]:The rotary flash dryer is characterized by simple structure, short drying time, low temperature rise of materials, suitable for drying of special materials, etc. On the basis of the traditional rotary flash dryer, the addition of rotary dispersion device (grading wheel) can solve the problem of product reunion again, improve the dispersing ability, and ensure that the dry product can meet certain particle size requirements. The classifier is working in the environment of high rotating speed and medium and high temperature. The structure is located at the top of the vertical cylinder drying chamber. Its vibration will affect the stability of the whole body to a great extent and even can not work normally when it is serious. Therefore, the dynamic characteristics of the rotor system and the coupling analysis between the stage wheel and the thermal fluid are analyzed, and it is concluded that the classifier wheel system can not meet the normal working requirements and needs to be adjusted or optimized. Firstly, discrete mass model and finite element method are used to analyze the rotor dynamics of the stage wheel, especially considering the influence of the gyroscope effect on the high-speed rotor. After mutual verification, it is found that the mathematical model has a large error to the higher-order mode, and the finite element method has a good simulation result for the stepped wheel-cage structure. Secondly, modal analysis and harmonic response analysis show that the rotor speed is less than but close to its first order critical speed. The transient unbalance response analysis also shows that the vibration increases sharply to a very large displacement value when the rotor starts close to the working speed, so in order to avoid excessive vibration, the rotor system should be adjusted and optimized. At the same time, the relationship between the thermal air flow in the drying room and the classifier wheel and the influence of the speed of the classifier wheel on the particle escape rate are analyzed and obtained. Finally, through the thermal-structural coupling analysis to verify the strength of the stage wheel structure and the effect of the flow field pressure on the wheel structure, the scheme of increasing the critical speed of the rotor system is selected to optimize the structure, and the satisfactory results are obtained.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TB4

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1 周濤;旋轉(zhuǎn)閃蒸干燥機(jī)分級(jí)輪動(dòng)力學(xué)及靜強(qiáng)度分析[D];東北大學(xué);2014年

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本文編號(hào)：1824482