本文選題：超聲蒸發(fā)器 + 回歸分析　； 參考：《天津科技大學》2016年碩士論文

【摘要】：化工工藝生產(chǎn)過程中，有效地提氋傳熱強度，節(jié)約能源的消耗以及降低生產(chǎn)的運行成本等是其重點關注的問題。而傳統(tǒng)的蒸發(fā)設備中高耗能、低產(chǎn)率的問題還是普遍存在的。如何對其進行優(yōu)化改進成了目前化工生產(chǎn)中亟待解決的問題。本文把超聲波技術應用到蒸發(fā)單元操作中，結(jié)合超聲波技術和蒸發(fā)技術的各自特點，設計出新型的蒸發(fā)操作裝置，合理優(yōu)化蒸發(fā)操作工藝，對其傳熱性能方面進行了實驗研究和數(shù)值模擬分析。本文使用課題組設計制造的超聲蒸發(fā)裝置，進行了純水的強化傳熱實驗，并結(jié)合實驗進行了超聲蒸發(fā)器加熱室內(nèi)流場和溫度場的數(shù)值模擬，對指導超聲蒸發(fā)器的工藝優(yōu)化和技術改進提供參考。得出如下結(jié)論：1)本文選取固定效應模型，分別對進料量、蒸發(fā)溫度、功率密度等參數(shù)進行了單因素實驗分析，并結(jié)合實驗數(shù)據(jù)進行了單因素的回歸模型的建立，通過驗證性實驗表明回歸模型的準確性，可用來預測單因素條件下的傳熱系數(shù)。單因素實驗條件下最佳操作參數(shù)點分別為進料量40 L/h，，蒸發(fā)溫度70℃，功率密度0.8A。2)實驗設計中采用均勻設計，分析雙因素對傳熱系數(shù)的影響，建立雙因素條件下最佳實驗操作參數(shù)，并建立了傳熱系數(shù)與操作參數(shù)的回歸方程，提出此回歸方程在實驗條件下的適用性。采用實驗設計的最佳操作參數(shù)范圍是進料量30L/h-55L/h，蒸發(fā)溫度70℃-90℃，功率密度0A-1.2A。3)利用FLUENT軟件進行超聲蒸發(fā)器加熱室內(nèi)的傳熱性能的數(shù)值模擬，模擬了管內(nèi)沸騰情況下的流場和溫度場，形象地表征了管內(nèi)沸騰的超聲空化狀態(tài)，對管內(nèi)壁面剪切力和出口管板進行分析，得出管內(nèi)循環(huán)時劇烈湍動而使得核態(tài)沸騰持續(xù)進行，對實驗的強化傳熱結(jié)果得以驗證，該結(jié)果對指導超聲蒸發(fā)器的工藝改進和優(yōu)化設計具有重要的參考價值。
[Abstract]:In the process of chemical process, it is important to raise heat transfer intensity effectively, to save energy consumption and to reduce production cost. However, the problem of high energy consumption and low yield in traditional evaporating equipment is widespread. How to optimize and improve it has become an urgent problem in chemical production. In this paper, ultrasonic technology is applied to evaporative unit operation. Combined with the respective characteristics of ultrasonic technology and evaporation technology, a new type of evaporation operation device is designed, and the evaporation operation technology is optimized reasonably. Experimental study and numerical simulation are carried out on the heat transfer performance. In this paper, the experiments of enhanced heat transfer of pure water are carried out by using the ultrasonic evaporator designed and manufactured by the research group, and the numerical simulation of the flow field and temperature field in the heating chamber of the ultrasonic evaporator is carried out in combination with the experiment. It provides a reference for guiding the process optimization and technical improvement of ultrasonic evaporator. The following conclusions are drawn as follows: (1) in this paper, the fixed effect model is selected, and the parameters such as feed quantity, evaporation temperature and power density are analyzed by single factor experiment, and the regression model of single factor is established by combining the experimental data. The verificative experiments show that the regression model is accurate and can be used to predict the heat transfer coefficient under the condition of single factor. The optimum operating parameters under single factor experimental conditions are as follows: feed quantity 40 L / h, evaporation temperature 70 鈩

本文編號：1810791