本文選題：氣旋型噴霧干燥塔　切入點(diǎn)：數(shù)值模擬　出處：《中國(guó)民航大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：全球性水危機(jī)日益加劇。我國(guó)水資源更是嚴(yán)重短缺,南北水資源分布不均。發(fā)展海水淡化技術(shù)是可以有效緩解當(dāng)前水危機(jī)的重要措施。噴霧蒸發(fā)海水淡化技術(shù)是一種新型的海水淡化技術(shù),它將海水噴霧蒸發(fā)得到水蒸氣,再將水蒸氣冷凝后得到淡水。該技術(shù)提高了海水的產(chǎn)水量和回收率,具有規(guī)模靈活,設(shè)備投資適中,可利用低位熱能等優(yōu)點(diǎn)。用太陽(yáng)能,這一清潔綠色能源作為熱源的噴霧蒸發(fā)海水淡化技術(shù)已經(jīng)成為未來(lái)海水淡化技術(shù)發(fā)展的主要方向。本文自主設(shè)計(jì)了太陽(yáng)能噴霧蒸發(fā)海水淡化系統(tǒng)原理圖。通過(guò)對(duì)該工作過(guò)程的分析,得出了最大的難點(diǎn)在于噴霧蒸發(fā)室的噴霧干燥過(guò)程。為了詳細(xì)了解噴霧蒸發(fā)室的噴霧干燥過(guò)程,以及提高噴霧蒸發(fā)室的干燥效率。采用數(shù)值模擬的辦法用Fluent軟件對(duì)噴霧蒸發(fā)過(guò)程進(jìn)行仿真模擬。本文重點(diǎn)模擬氣旋型噴霧干燥塔內(nèi)的噴霧蒸發(fā)過(guò)程�；赽reakup和collision液滴破碎模型采用Fluent和Gambit軟件對(duì)氣旋型噴霧干燥過(guò)程進(jìn)行了數(shù)值模擬,得到了干燥過(guò)程中干燥塔內(nèi)流場(chǎng)、速度、溫度分布情況,以及顆粒運(yùn)動(dòng)直徑變化和停留時(shí)間等信息。模型還分析了進(jìn)風(fēng)溫度、風(fēng)速、料液溫度及重力等因素對(duì)蒸發(fā)效率的影響。得出了如下結(jié)論:1、進(jìn)風(fēng)溫度越高,蒸發(fā)效率越高。當(dāng)進(jìn)風(fēng)溫度達(dá)到473K后,再提高進(jìn)風(fēng)溫度,對(duì)干燥塔的整體蒸發(fā)效率提高作用不大;2、進(jìn)風(fēng)速度越快,干燥效率越高。當(dāng)速度達(dá)到20m/s后,速度再提高,干燥效率顯著減小;3、提高料液的預(yù)溫度和將干燥塔倒置,這兩種方法對(duì)整體的噴霧蒸發(fā)效率影響很小;4、考慮到Fluent自帶的噴嘴模型的霧化顆粒均勻性不夠高,在實(shí)際生產(chǎn)中,通過(guò)使用高技術(shù)噴嘴,提高顆粒的均勻性,將大大提升霧化干燥的效率。以上結(jié)論,為氣旋型噴霧干燥塔的優(yōu)化設(shè)計(jì)和干燥效率的提高提供了理論依據(jù),為下一步模擬鹽霧分離的模擬,墊定基礎(chǔ)。
[Abstract]:The global water crisis is worsening day by day. The development of seawater desalination technology is an important measure to alleviate the current water crisis. Spray evaporation desalination technology is a new desalination technology. After condensing water vapor, fresh water is obtained. The technology improves the water production and recovery rate of seawater, has the advantages of flexible scale, moderate investment in equipment, utilization of low thermal energy, and so on. The spray evaporation desalination technology of clean green energy as a heat source has become the main direction of seawater desalination technology in the future. The principle diagram of solar spray evaporation desalination system is designed in this paper. The analysis of the working process, In order to understand the spray drying process of spray evaporation chamber in detail, the biggest difficulty is the spray drying process of spray evaporation chamber. The method of numerical simulation was used to simulate the spray evaporation process with Fluent software. In this paper, the spray evaporation process in cyclone spray drying tower was simulated emphatically. Based on breakup and collision, the spray evaporation process in the cyclone spray drying tower was simulated. The droplet breakage model was used to simulate the cyclone spray drying process using Fluent and Gambit software. The flow field, velocity, temperature distribution, particle movement diameter and residence time in the drying tower were obtained. The model also analyzed the inlet air temperature and wind speed. Effects of feed temperature and gravity on evaporation efficiency. The following conclusion is drawn: the higher the inlet air temperature, the higher the evaporation efficiency. When the inlet air temperature reaches 473K, the inlet air temperature is raised. It has little effect on the overall evaporation efficiency of the drying tower, and the faster the inlet air speed, the higher the drying efficiency. When the speed reaches 20 m / s, the drying efficiency will be increased, the drying efficiency will be significantly reduced, the pretemperature of the material solution will be increased and the drying tower will be inverted. The effect of these two methods on the overall spray evaporation efficiency is very small. Considering that the atomization particle uniformity of the nozzle model brought by Fluent is not high enough, the uniformity of the particles can be improved through the use of high-tech nozzles in actual production. The above conclusion provides a theoretical basis for the optimization design of cyclone spray drying tower and the improvement of drying efficiency, and provides the basis for the next simulation of salt spray separation.
【學(xué)位授予單位】：中國(guó)民航大學(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)：1574476