本文選題：海水淡化 + 低溫多效��； 參考：《大連理工大學(xué)》2014年碩士論文

【摘要】：目前,隨著科技發(fā)展、人口增長、污染加劇,淡水資源匱乏的問題日益嚴(yán)峻。在這樣的背景下,海水淡化技術(shù)作為一種可以增加淡水資源總量的技術(shù)手段而備受關(guān)注。其中的LT-MED(低溫多效蒸餾)技術(shù)因其操作溫度低,不易結(jié)垢,裝置組合方式靈活,可利用多種形式的低品位熱源等優(yōu)點成為海水淡化領(lǐng)域的主流方法之一。 本文著眼于熱水驅(qū)動的中小型LT-MED系統(tǒng),對此類系統(tǒng)的工作特點及其設(shè)計方法進(jìn)行了分析總結(jié)。給出了水和水蒸汽物性參數(shù)及海水沸點升高的計算方法�？紤]海水物性的變化,以及沿程阻力的影響,建立了包括預(yù)熱器、蒸發(fā)器、冷凝器、閃蒸罐等各換熱設(shè)備在內(nèi)的此類系統(tǒng)的數(shù)值模型,設(shè)計了系統(tǒng)的循環(huán)迭代計算方法并繪制了計算框圖。 采用FORTRAN95和Visual Basic多語言混合編程的方法編寫了中小型LT-MED系統(tǒng)的可視化設(shè)計計算程序,開發(fā)出友好的人機對話界面。運用DLL(動態(tài)鏈接庫)技術(shù)實現(xiàn)兩種語言的結(jié)合,發(fā)揮了FORTRAN語言運算能力優(yōu)秀和VB界面設(shè)計功能強大的優(yōu)點,獲得了較好的程序性能。編寫程序時,采用模塊化編程的方法,可以實現(xiàn)六種不同設(shè)計條件下的系統(tǒng)的熱力學(xué)計算,輸出各換熱設(shè)備進(jìn)出口溫度、焓值、質(zhì)量流量及各效熱負(fù)荷、產(chǎn)水量等相關(guān)參數(shù),并且可以將最后結(jié)果以Excel的形式導(dǎo)出,便于設(shè)計人員對不同設(shè)計參數(shù)進(jìn)行比對分析,優(yōu)化設(shè)計結(jié)果。并可以對換熱器的結(jié)構(gòu)進(jìn)行設(shè)計 在此基礎(chǔ)上,對熱水驅(qū)動的中小型MED系統(tǒng)在與之結(jié)合的熱源系統(tǒng)的運行參數(shù)發(fā)生變化時系統(tǒng)性能的變化情況進(jìn)行了研究。對某一確定結(jié)構(gòu)的系統(tǒng)而言,系統(tǒng)產(chǎn)水率、各效產(chǎn)水率、各換熱設(shè)備熱負(fù)荷、各換熱設(shè)備實際傳熱溫差、海水實際濃縮比等參數(shù)均隨著輸入熱量的增大而增大；而各效噴淋密度及各換熱設(shè)備傳熱系數(shù)則隨輸入熱量的增大而呈減小趨勢,同時,單位熱量產(chǎn)水率隨輸入熱量增大而減少。
[Abstract]:At present, with the development of science and technology, population growth, pollution, shortage of freshwater resources is a serious problem. Under this background, the seawater desalination technology as a technical means can increase the total amount of freshwater resources has attracted more and more attention. The LT-MED (LT-MED) technology because of its low operating temperature, no scaling device, flexible combination method, the advantages of using low grade heat source in various forms and become the main method of seawater desalination.
This paper focuses on small and medium sized LT-MED system in hot water drive, the work characteristics of this kind of system and its design method are analyzed. The calculation method of the properties of water and steam and water boiling is given. Considering the change of the water properties, and the influence of frictional resistance, including the establishment of the preheater, evaporator, condenser the numerical model of this system, the heat exchanger, the flash tank, the design of iterative calculation method for system and draw the calculation diagram.
Methods FORTRAN95 and Visual Basic hybrid programming program visualization design of small LT-MED system, develop the friendly man-machine dialogue interface. Using DLL (Dynamic Link Library) to realize the combination of the two languages, FORTRAN language has the advantages of excellent operation ability and powerful VB interface design, the program performance better. When you write a program, using the method of modular programming, can achieve six different thermodynamic system design under the condition of the calculation, the output of the heat exchanger outlet temperature, enthalpy, mass flow and the effect of heat load, water production and other related parameters, and the final results will be derived the form of Excel, so that the designer of the different design parameters were compared and analyzed, the result of optimization. And we can design the structure of heat exchanger.
On this basis, to the change of system performance in small MED system of hot water driven changes in the operating parameters of heat source system with time are studied. For a system to determine the structure of the system, water production rate, water production rate of each effect, the heat exchanger heat load, the change thermal equipment actual heat transfer temperature difference, the actual water concentration ratio and other parameters are increased with increasing heat input; and the effect of spray density and the heat transfer coefficient increases with the increase of heat input decreased, at the same time, the unit of heat water production rate with the heat input quantity decreases.

【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：P747

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