【摘要】：根據(jù)低溫多效蒸餾海水淡化系統(tǒng)的工況范圍及對(duì)傳熱和流動(dòng)的要求,并結(jié)合板式蒸發(fā)器緊湊、高效的特點(diǎn),本文提出了在低溫多效蒸餾海水淡化系統(tǒng)中采用板式蒸發(fā)器替代傳統(tǒng)管殼式蒸發(fā)器的設(shè)想。以窄通道的人字形板式蒸發(fā)器和寬通道的LT型板式蒸發(fā)器為實(shí)驗(yàn)元件,設(shè)計(jì)并搭建了強(qiáng)化傳熱實(shí)驗(yàn)臺(tái)。針對(duì)蒸發(fā)和凝結(jié)兩種不同的換熱方式,進(jìn)行了傳熱性能和流動(dòng)性能的實(shí)驗(yàn)研究。實(shí)驗(yàn)得到了在不同蒸汽流量下,水蒸氣在兩種換熱器中的凝結(jié)換熱系數(shù)、蒸發(fā)換熱系數(shù)和流動(dòng)阻力,并擬合成Nu以及f隨Re變化的無因次關(guān)聯(lián)式。通過實(shí)驗(yàn)獲得的數(shù)據(jù),對(duì)兩種板片的換熱能力進(jìn)行對(duì)比分析。研究結(jié)果為板式蒸發(fā)器應(yīng)用在海水淡化水電聯(lián)產(chǎn)系統(tǒng)提供參考。 本文最后以蛇形翅片扁平管為研究對(duì)象,以預(yù)測(cè)管內(nèi)凝結(jié)水凍結(jié)規(guī)律為目的,搭建了風(fēng)洞實(shí)驗(yàn)臺(tái),獲得管內(nèi)為單相水對(duì)流換熱條件下的蛇形翅片扁平管的傳熱性能。實(shí)驗(yàn)結(jié)果可以作為預(yù)測(cè)扁平管內(nèi)凝結(jié)水凍結(jié)規(guī)律的依據(jù),為火電直接空冷機(jī)組防凍措施的制定提供參考。
[Abstract]:According to the operating range of low-temperature multi-effect distillation seawater desalination system and the requirement of heat transfer and flow, combined with the compact and efficient characteristics of plate evaporator, In this paper, the idea of using plate evaporator to replace the traditional tube and shell evaporator in low temperature multieffect distillation seawater desalination system is put forward. Taking the narrow channel herringbone plate evaporator and the wide channel LT type plate evaporator as the experimental elements, a heat transfer enhancement experiment platform is designed and built. The heat transfer performance and fluidity of two different heat transfer modes, evaporation and condensation, were studied experimentally. The condensation heat transfer coefficient, evaporation heat transfer coefficient and flow resistance of water vapor in two kinds of heat exchangers are obtained under different steam flow rates, and the dimensionless correlations of Nu and f with Re are proposed. Through the experimental data, the heat transfer ability of the two kinds of plates was compared and analyzed. The results provide a reference for the application of plate evaporator in seawater desalination hydropower system. Finally, in order to predict the freezing law of condensate water in a serpentine finned flat tube, a wind tunnel experimental bench is built to obtain the heat transfer performance of a serpentine fin flat tube under the condition of single-phase water convection heat transfer. The experimental results can be used as the basis to predict the freezing law of condensate in flat pipe and provide a reference for the formulation of anti-freezing measures for direct air-cooled units of thermal power plants.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：P747

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本文編號(hào)：2306119