本文關(guān)鍵詞： 溴化鋰溶液 納米 異辛醇 傳質(zhì)　出處：《北京建筑大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本文主要研究了氣相異辛醇添加劑對納米溴化理溶液降膜傳質(zhì)特性的影響根據(jù)異辛醇的分子結(jié)構(gòu),從固液界面、氣液界面兩個角度分析了異辛醇強(qiáng)化傳質(zhì)的機(jī)理。從微觀和宏觀角度分析了Marangoni對流產(chǎn)生的條件、過程和機(jī)理。并解釋了氣相添加異辛醇與液相添加異辛醇相比的不同和優(yōu)勢。根據(jù)液相添加異辛醇時純溴化鋰溶液、只添加納米的溴化鋰溶液、添加分散劑的納米溴化鋰溶液的表面張力變化,運(yùn)用Gibbs吸附公式和希什科夫斯基經(jīng)驗(yàn)公式,計算了不同成分溴化鋰溶液異辛醇的飽和吸附量,并且得出了添加分散劑的納米溴化鋰溶液異辛醇吸附量減小的計算結(jié)果。將不同質(zhì)量的液相異辛醇加入到水蒸氣發(fā)生器中,并控制和計算了進(jìn)入吸收器中氣相異辛醇的含量。運(yùn)用溴化鋰傳質(zhì)性能試驗(yàn)臺,對氣相異辛醇添加劑對納米溴化理溶液降膜傳質(zhì)特性進(jìn)行了實(shí)驗(yàn)研究。研究了不同吸收壓力、不同流量下添加納米粒子和異辛醇以氣相方式進(jìn)入吸收器時溴化鋰溶液降膜吸收水蒸氣的相對濃度差、水蒸氣吸收速率、傳質(zhì)系數(shù)等傳質(zhì)特性,并用傳質(zhì)強(qiáng)化比addF表征了氣相異辛醇所引起的Marangoni對流對傳質(zhì)的影響。實(shí)驗(yàn)結(jié)果表明氣相添加異辛醇和納米粒子對溴化鋰溶液吸收水蒸氣的能力起到了促進(jìn)作用。促進(jìn)作用與降膜流量、吸收壓力、異辛醇添加量之間有一定的規(guī)律。當(dāng)吸收壓力為1.6Kpa時,水蒸汽發(fā)生器中添加1%異辛醇時的傳質(zhì)系數(shù)是純溴化鋰溶液的1.74倍,是納米溴化鋰溶液的1.32倍。addF隨流量呈先增大,后減小趨勢。根據(jù)水蒸氣的吸收速率導(dǎo)出了異辛醇在吸收發(fā)生時的吸附量,并與第二章所計算的飽和吸附量值和傳質(zhì)強(qiáng)化比addF變化趨勢相吻合,即addF并不是隨著傳質(zhì)系數(shù)的增長而增長,并認(rèn)為是流量增大對Marangoni對流的抑制和異辛醇的覆蓋作用削弱了溴化鋰溶液對水蒸氣的吸收強(qiáng)化程度。
[Abstract]:The effect of gas phase isooctyl alcohol additive on the falling film mass transfer characteristics of nanometer brominated solution was studied according to the molecular structure of isooctanol from the solid-liquid interface. The mechanism of enhanced mass transfer by isooctanol was analyzed from two angles of gas-liquid interface, and the conditions of Marangoni convection were analyzed from both microscopic and macroscopic angles. Process and mechanism. The differences and advantages of gas phase addition of isooctanol and liquid phase addition of isooctanol were explained. According to the pure lithium bromide solution when isooctanol was added in liquid phase, only nanometer lithium bromide solution was added. The surface tension of nanometer lithium bromide solution with dispersant was changed. The saturated adsorption capacity of iso-octanol in lithium bromide solution with different components was calculated by using Gibbs adsorption formula and Hishkovsky's empirical formula. The calculation results of the reduction of iso-octanol adsorption amount in nanometer lithium bromide solution with dispersant were obtained. Different liquid phase isooctanol was added to the water vapor generator. The content of gaseous isooctanol in the absorber was controlled and calculated. The falling film mass transfer characteristics of gaseous isooctyl alcohol additive on nanometer brominated solution were studied experimentally and the different absorption pressures were studied. The relative concentration difference of water vapor absorption rate of water vapor absorption rate mass transfer coefficient and so on when lithium bromide solution drops film into absorber with different flow rate and iso-octanol are added into the absorber in gas phase. The effect of Marangoni convection induced by gaseous isooctanol on mass transfer was characterized by mass transfer enhancement ratio (addF). The ability to play a catalytic role. Promote the role of falling film flow. When the absorption pressure is 1.6Kpa, the mass transfer coefficient of 1% isooctanol in the steam generator is 1.74 times that of the pure lithium bromide solution. The amount of iso-octanol adsorbed in the presence of iso-octanol was derived according to the absorption rate of water vapor, which was 1.32 times as much as 1.32 times of nano-lithium bromide solution and then decreased with the flow rate. It coincides with the change trend of saturated adsorption volume and mass transfer enhancement ratio (addF) calculated in chapter 2, that is, addF does not increase with the increase of mass transfer coefficient. It is considered that the inhibition of Marangoni convection and the coverage of isooctyl alcohol with the increase of flow rate weaken the enhancement of water vapor absorption in libr solution.
【學(xué)位授予單位】：北京建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ131.11;TB383.1

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