本文選題：高分子中空纖維　切入點：弓形折流擋板　出處：《天津大學》2015年碩士論文

【摘要】：換熱設備是工業(yè)生產(chǎn)過程中實現(xiàn)物料之間熱量交換的重要設備。但是傳統(tǒng)的金屬換熱設備由于其腐蝕和易結(jié)垢問題的存在,在高鹽、高酸堿、高硬度環(huán)境下的應用受到了限制。高分子中空纖維傳熱元件制作的換熱設備由于其具有良好的抗腐蝕和防垢性能,因而受到關注。本文采用高分子中空纖維作為傳熱元件,研制了具有弓形折流擋板的新型中空纖維換熱器,對此進行了Fluent模擬和實驗研究。結(jié)果表明,所建立模型的模擬結(jié)果與實驗結(jié)果吻合較好。通過對比發(fā)現(xiàn),增加了折流擋板以后,中空纖維換熱器的總換熱系數(shù)相對于無折流擋板換熱器提高了35%;殼程的進出口壓降提高了14%;殼程熱阻所占總熱阻的比例從59%-70%下降到了34.5%-46.7%;殼程換熱系數(shù)與殼程進出口壓降的比值得到了明顯的提高。綜合分析可知,殼程增加折流擋板能夠顯著提高中空纖維換熱器的換熱性能,實現(xiàn)了對中空纖維換熱器換熱過程的強化。本文將高分子中空纖維換熱組件作為蒸發(fā)器組件,以此搭建了單效和三效蒸發(fā)裝置。分別以純水和質(zhì)量分數(shù)3%的NaCl溶液作為進料液,考察了操作工況對蒸發(fā)裝置的產(chǎn)水量和造水比(GOR)的影響規(guī)律。結(jié)果表明,對于單效和三效蒸發(fā)裝置,裝置的GOR和產(chǎn)水量均隨著進料溫度和蒸發(fā)溫差的升高而增大。隨著進料流量的提高,裝置的產(chǎn)水量不斷增加,而GOR保持穩(wěn)定。當進料液為純水時,隨著進料流量的提高,單效和三效蒸發(fā)裝置的GOR分別穩(wěn)定在0.85和1.65左右。當進料液為NaCl溶液時,隨著進料流量的提高,單效和三效蒸發(fā)裝置的GOR分別穩(wěn)定在0.76和1.48左右。在各效的進料流量為90L/h、生蒸汽溫度為97°C、進料溫度為78°C、總蒸發(fā)溫差為12°C的條件下,當進料液為純水時,三效蒸發(fā)裝置的產(chǎn)水量達到了6.55kg/h;當進料液為NaCl溶液時,三效蒸發(fā)裝置的產(chǎn)水量達到了5.9kg/h。另外,當進料液為NaCl溶液時,單效和三效蒸發(fā)裝置的產(chǎn)水量和GOR均小于相同條件下進料為純水時裝置的GOR和產(chǎn)水量。本課題的意義在于為強化高分子中空纖維換熱器的換熱性能提供了一種新方法,同時為利用高分子中空纖維設計高效蒸發(fā)工藝奠定了基礎。
[Abstract]:Heat exchanger is an important equipment to realize heat exchange between materials in industrial production process, but the traditional metal heat exchanger is in high salt, high acid and alkali due to its corrosion and easy scaling problem. The application in high hardness environment is limited. The heat exchanger made of high molecular hollow fiber heat transfer element has attracted much attention because of its good corrosion and scale resistance. In this paper, the high molecular hollow fiber is used as heat transfer element. A new type of hollow fiber heat exchanger with bow baffle is developed. The Fluent simulation and experimental study are carried out. The results show that the simulation results of the model are in good agreement with the experimental results. After adding the baffle, The total heat transfer coefficient of hollow fiber heat exchanger is 35% higher than that of non-baffle heat exchanger; the pressure drop of inlet and outlet of shell side is increased 14%; the proportion of heat resistance of shell side decreases from 59-70% to 34.5-46.7%; the heat transfer coefficient of shell side and shell side enter and exit. The ratio of mouth pressure drop is obviously increased. The heat transfer performance of the hollow fiber heat exchanger can be improved by increasing the baffle baffle on the shell side, and the heat transfer process of the hollow fiber heat exchanger can be strengthened. In this paper, the polymer hollow fiber heat transfer module is used as the evaporator assembly. Using pure water and NaCl solution of 3% mass fraction as feed solution, the effects of operating conditions on water yield and water ratio of evaporator were investigated. For single-effect and three-effect evaporators, both GOR and water yield increase with the increase of feed temperature and evaporation temperature difference. With the increase of feed flow rate, the water production of the unit increases continuously, while the GOR remains stable. When the feed liquid is pure water, With the increase of feed flow rate, the GOR of single-effect and three-effect evaporator is about 0.85 and 1.65, respectively. When the feed liquid is NaCl solution, with the increase of feed flow rate, The GOR of single-effect and three-effect evaporator is about 0.76 and 1.48.The feed flow rate of each effect is 90L / h, steam temperature is 97 擄C, feed temperature is 78 擄C, total evaporation temperature difference is 12 擄C, and when the feed liquid is pure water, The water production of the three-effect evaporator is 6.55 kg / h; when the feed solution is NaCl solution, the water yield of the three-effect evaporator is 5.9 kg / h. In addition, when the feed solution is NaCl solution, The water production and GOR of single-effect and three-effect evaporators are smaller than those of pure water under the same conditions. The significance of this project is to provide a new method for enhancing the heat transfer performance of polymer hollow fiber heat exchangers. At the same time, it lays a foundation for the design of high-efficiency evaporation process using macromolecule hollow fiber.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ342.8;TQ051.5

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