本文選題：降膜蒸發(fā) + 液膜流動(dòng)�。� 參考：《華東理工大學(xué)》2016年碩士論文

【摘要】：立式降膜蒸發(fā)器因其較高的傳熱系數(shù),較小的傳熱溫差等特點(diǎn),獲得廣泛的應(yīng)用。本文基于節(jié)能減排的目的,旨在開(kāi)發(fā)多孔管高效降膜蒸發(fā)器。本實(shí)驗(yàn)的最小容許降液流率為35kg/h,設(shè)計(jì)的鋸齒型和錐型布膜器都能有效成膜,減小不均勻系數(shù)芎,為傳熱實(shí)驗(yàn)提供保證。開(kāi)發(fā)內(nèi)燒結(jié)型表面多孔管降膜蒸發(fā)器,在熱通量q=13-90kW·m-2,傳熱溫差ΔT=2.87-9.5℃,液體Reynolds數(shù)ReL=4500-15000范圍內(nèi)分別以純水和鹽水為介質(zhì)進(jìn)行實(shí)驗(yàn),并與螺旋平紋管和三頭波紋管對(duì)比。結(jié)果表明：多孔管傳熱溫差約為光滑管的1/2,降膜傳熱系數(shù)比光滑管提高約100%,而三頭波紋管僅提高約17%,螺旋平紋管并沒(méi)有特別明顯的強(qiáng)化效果。多孔管在3%質(zhì)量分?jǐn)?shù)的鹽水中依然保持高效的傳熱性能,能夠應(yīng)用于多效蒸發(fā)系統(tǒng),實(shí)現(xiàn)低溫差傳熱,減小傳熱面積。采用Aspen Plus軟件模擬多效蒸發(fā)系統(tǒng),結(jié)果表明：相比其他進(jìn)料方式,平流進(jìn)料方式具有較高的造水比,回收比和濃縮比,蒸發(fā)濃縮性能優(yōu)勢(shì)顯著。對(duì)于平流進(jìn)料方式,抽取部分二次蒸汽預(yù)熱進(jìn)口物料,優(yōu)化后的系統(tǒng)造水比明顯提高。
[Abstract]:The vertical falling film evaporator is widely used because of its high heat transfer coefficient and small heat transfer temperature difference. Based on the purpose of energy saving and emission reduction, this paper aims at developing a high efficiency falling film evaporator with porous tube. The minimum allowable drop flow rate of this experiment is 35kg/h. The designed sawtooth and cone type film distributor can effectively form the film and reduce the inhomogeneous system. In order to provide guarantee for the heat transfer experiment, the internal porous tube falling film evaporator with internal sintered surface was developed to experiment with pure water and brine in the range of heat flux q=13-90kW m-2, heat transfer temperature difference of T=2.87-9.5 C, Reynolds number ReL=4500-15000 of liquid, and compared with spiral plain tube and three bellows. For the 1/2 of the smooth tube, the heat transfer coefficient of the falling film is about 100% higher than that of the smooth tube, and the three bellows only increase by about 17%. The spiral plain tube has no special strengthening effect. The porous tube still maintains the high efficiency heat transfer performance in the salt water of 3% mass fraction. It can be applied to the multi effect evaporation system to realize the heat transfer of low temperature difference and reduce the transmission. The Aspen Plus software is used to simulate the multi effect evaporation system. The results show that compared with the other feeding methods, the flat flow feeding method has a higher water ratio, the recovery ratio and the concentration ratio, and the evaporation concentration performance advantage is significant. For the flat flow feed method, the two steam preheated imported materials are extracted and the optimized system water making ratio is significantly raised. High.

【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：TQ021.3

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