本文選題：蒸發(fā)式空冷器 + 傳熱傳質　； 參考：《華中科技大學》2015年碩士論文

【摘要】：在現(xiàn)代社會,能源消耗,環(huán)境影響和日益完善的環(huán)境法律都迫使人們減少能源需求量,這樣,就需要人們開發(fā)更高能源利用率的設備。蒸發(fā)式空冷器是一種將水冷與空冷、傳熱與傳質過程融為一體且兼有兩者之長的新型冷凝冷卻設備。它具有結構緊湊、傳熱效率高、投資省、操作費用低、占地面積小及安裝、維護方便等優(yōu)點,在煉油、化工、冶金、制冷等行業(yè)中有著廣闊的應用前景,是空冷技術發(fā)展的新方向,然而其應用缺乏充分的實驗數(shù)據(jù)和理論設計作為指導依據(jù)。蒸發(fā)式空冷器傳熱傳質過程是非常復雜的,本文首先對傳熱傳質過程進行了較為深入的分析,選取一個理想化的微元控制體,利用物料衡算和能量衡算分析,以此加深對蒸發(fā)式空冷器傳熱傳質過程的認識。基于此,建立了蒸發(fā)式空冷系統(tǒng)小試裝置,以多氯聯(lián)苯作為工藝介質,探討了工藝介質流量、工藝介質進口溫度、噴淋水量和空氣流量對系統(tǒng)傳熱性能的影響。發(fā)現(xiàn)只有風機與噴淋水量達到一個最優(yōu)配比時,才能夠最大限度的發(fā)揮蒸發(fā)式空冷器的特點。在風機頻率為40Hz、噴淋水頻率為15Hz左右時,二者能夠最佳耦合;而在工藝介質進口溫度為45℃,工質流量為45Hz,噴淋水流量為17.9Hz和風機頻率為50Hz時,系統(tǒng)有最大的管外聯(lián)合傳熱系數(shù)。從統(tǒng)計分析的角度,結合管外聯(lián)合傳熱系數(shù)的概念,利用IBM SPSS軟件,通過多元線性回歸分析,研究對管外給熱系數(shù)具有顯著影響的因素,得到管外聯(lián)合傳熱系數(shù)傳熱模型。對比分析得出模型4是最優(yōu)的,模型校驗發(fā)現(xiàn),實驗測量值與模型計算值的相對誤差均在±13%以內,表明模型4具有較好的正確性。
[Abstract]:In modern society, energy consumption, environmental impact and increasingly perfect environmental laws force people to reduce energy demand, so people need to develop more energy-efficient equipment. Evaporative air cooler is a new type of condensing and cooling equipment, which combines water and air cooling, heat and mass transfer processes, and has the length of both. It has the advantages of compact structure, high heat transfer efficiency, low investment, low operating cost, small area of occupation, easy installation and maintenance, etc. It has a broad application prospect in oil refining, chemical industry, metallurgy, refrigeration and other industries. It is a new direction in the development of air cooling technology. However, its application lacks sufficient experimental data and theoretical design as the guidance basis. The heat and mass transfer process of evaporative air cooler is very complicated. Firstly, the heat and mass transfer process is analyzed deeply in this paper. An idealized micro-element control body is selected, and the material balance and energy balance are used to analyze the heat and mass transfer process. In order to deepen the understanding of the evaporative air cooler heat and mass transfer process. Based on this, a pilot test unit of evaporative air cooling system was established. The effects of flow rate, inlet temperature, spray water and air flow rate on the heat transfer performance of the system were discussed with polychlorinated biphenyls (PCBs) as the process medium. It is found that the characteristics of evaporative air cooler can be maximized only when the fan and sprinkler reach an optimal ratio. When the frequency of fan is 40 Hz and the frequency of spray water is about 15Hz, the two can be best coupled, while when the inlet temperature of process medium is 45 鈩，

本文編號：1952336