本文關(guān)鍵詞： 膜蒸餾 膜潤濕 膜孔干燥 臨界潤濕深度 氣體吹掃　出處：《天津工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著水資源污染狀況的日益加劇,疏水膜分離技術(shù)的應(yīng)用越來越廣泛。但與此同時,疏水膜在使用過程中存在的膜孔干燥問題不容忽視。為了解決疏水膜的膜孔干燥問題,本文首先借鑒本課題組前期的科研成果,進一步研究了疏水膜的臨界潤濕深度,并通過本文設(shè)計的VMD-清洗實驗,在室溫條件下實現(xiàn)了疏水膜分離過程的持續(xù)運行。其次,提出了一種采用室溫空氣吹掃干燥疏水膜的方法,并驗證了氣體在吹掃過程中的作用原理。根據(jù)本課題組前期的研究成果,進一步研究發(fā)現(xiàn)實驗所用的疏水性聚偏氟乙烯中空纖維膜的臨界潤濕深度為一具體范圍19.5±0.5μm。采用另一種表面活性劑對疏水膜進行分離實驗,得到該疏水膜的臨界潤濕深度值為20.0μm,此深度值在19.5±0.5μm范圍內(nèi),由此可以確定對于特定的疏水膜材料臨界潤濕深度值為一個確定值。按照本文設(shè)計的自脫水運行方法,通過循環(huán)進行VMD-清洗實驗,在室溫條件下可以實現(xiàn)疏水膜材料的膜孔干燥,從而實現(xiàn)膜分離過程的持續(xù)運行。采用室溫空氣對疏水膜進行吹掃,發(fā)現(xiàn)對于實驗所用的疏水膜的吹掃干燥方法,存在一個吹掃氣體壓力限值,此值在0.108MPa與0.144MPa之間,當吹掃氣體壓力在此范圍內(nèi),疏水膜表面的水可以被全部排出,從而使疏水膜恢復(fù)至干燥狀態(tài)。通過研究含濕量不同的兩種室溫氣體對疏水膜的吹掃作用原理,可以確定氣體在吹掃過程中主要表現(xiàn)為吹掃氣體的機械剪切力作用而不是氣體載濕干燥作用,與常規(guī)加熱干燥方法的原理不同。
[Abstract]:With the increasing pollution of water resources, the application of hydrophobic membrane separation technology is becoming more and more extensive, but at the same time, the problem of membrane pore drying in the process of using hydrophobic membrane can not be ignored. In this paper, the critical wetting depth of the hydrophobic membrane is further studied by referring to the previous research results of our group, and the continuous operation of the hydrophobic membrane separation process is realized at room temperature through the VMD-cleaning experiment designed in this paper. A method of using room temperature air to sweep dry hydrophobic film is put forward, and the action principle of gas in the process of blowing is verified. It was found that the critical wetting depth of the hydrophobic polyvinylidene fluoride hollow fiber membrane was 19.5 鹵0.5 渭 m. Another surfactant was used to separate the hydrophobic membrane. The critical wetting depth of the hydrophobic film is 20.0 渭 m, which is in the range of 19.5 鹵0.5 渭 m. It can be determined that the critical wetting depth of the hydrophobic membrane material is a certain value. According to the self-dewatering operation method designed in this paper, By circulating VMD-cleaning experiment, the membrane hole drying of hydrophobic membrane material can be realized at room temperature, and the continuous operation of membrane separation process can be realized, and the hydrophobic film can be swept by air at room temperature. It is found that there is a limit value of blowing gas pressure between 0.108 MPA and 0.144 MPA for the blowing drying method of the hydrophobic film used in the experiment. When the blowing gas pressure is in this range, the water on the surface of the hydrophobic film can be completely discharged. In order to restore the hydrophobic film to the dry state. By studying the principle of blowing and sweeping the hydrophobic film by two kinds of room temperature gases with different moisture content, It can be concluded that the mechanical shear force of the purging gas is the main mechanism in the process of gas purging rather than the wet drying of the gas, which is different from the principle of the conventional heating drying method.
【學(xué)位授予單位】：天津工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ051.893

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