發(fā)布時(shí)間：2018-05-27 09:24

  本文選題：溶液調(diào)濕 + 氣流分布��； 參考：《安徽工業(yè)大學(xué)》2017年碩士論文

【摘要】：隨著節(jié)能減排的深入,以及人們對室內(nèi)空氣品質(zhì)要求的提高,溶液調(diào)濕新風(fēng)機(jī)組逐漸進(jìn)入市場。但是目前在溶液調(diào)濕產(chǎn)品冬季加濕性能及塔內(nèi)氣流均勻性方面研究不足。本文以不同填料冬季加濕性能參數(shù)及塔內(nèi)填料最優(yōu)擺放形式的確定為研究目標(biāo),結(jié)合實(shí)驗(yàn)分析和數(shù)值模擬的方法展開研究。首先,設(shè)計(jì)一臺額定風(fēng)量為500 m3/h的熱泵熱平衡式溶液調(diào)濕新風(fēng)機(jī)組并對其進(jìn)行可行性分析。機(jī)組由溶液循環(huán)系統(tǒng)、熱泵系統(tǒng)、風(fēng)系統(tǒng)、電氣控制系統(tǒng)及測試系統(tǒng)五部分組成。機(jī)組的特色在于通過單溶液槽的設(shè)計(jì)方法實(shí)現(xiàn)溶液濃度的動態(tài)平衡,及通過6 kW的輔助冷凝器實(shí)現(xiàn)熱泵系統(tǒng)的能量平衡。通過對系統(tǒng)lgp-h圖的分析以及相關(guān)技術(shù)調(diào)研,進(jìn)一步確定機(jī)組設(shè)計(jì)方案的可行性,并完成實(shí)驗(yàn)臺的搭建工作。其次,在實(shí)驗(yàn)臺搭建完成后開展機(jī)組冷態(tài)實(shí)驗(yàn),主要包括風(fēng)系統(tǒng)、水系統(tǒng)及熱泵系統(tǒng)的調(diào)試工作。首先對實(shí)驗(yàn)臺進(jìn)行密封性測試,系統(tǒng)漏風(fēng)率測試結(jié)果在±20%以內(nèi),能保證實(shí)驗(yàn)數(shù)據(jù)的可靠性。然后通過飄帶、煙霧示蹤及化學(xué)顯色法對塔內(nèi)氣流均勻性進(jìn)行定性和定量分析。通過水系統(tǒng)實(shí)驗(yàn)確定了布液器最優(yōu)開孔數(shù)量與流量之間的函數(shù)關(guān)系,結(jié)合實(shí)驗(yàn)結(jié)果得到重力型排管布液器的流量系數(shù)約為0.56。熱泵系統(tǒng)調(diào)試主要包括輔助冷凝器開、關(guān)狀態(tài),膨脹閥開度調(diào)節(jié)以及泵與風(fēng)機(jī)流量調(diào)節(jié)對系統(tǒng)性能的影響,調(diào)試得到膨脹閥開度的最優(yōu)區(qū)間為2.5-3.5。根據(jù)冷態(tài)實(shí)驗(yàn)結(jié)果可制定實(shí)驗(yàn)臺各子系統(tǒng)的優(yōu)化控制策略。再次,通過數(shù)值模擬方法確定塔內(nèi)填料最優(yōu)擺放形式及其優(yōu)化策略。根據(jù)各填料盤波紋板法線間的幾何關(guān)系共制定四種模擬工況,模擬結(jié)果表明波紋板法線交叉形式對應(yīng)的塔內(nèi)氣流均勻性最好,且影響氣流分布效果的關(guān)鍵因素是底盤填料的擺放形式及結(jié)構(gòu)參數(shù)。根據(jù)四種工況的對比結(jié)果定義了氣流均勻性過渡層的概念,并對過渡層高度進(jìn)行了優(yōu)化模擬,得到過渡層最優(yōu)高度與填料塔截面風(fēng)速間的函數(shù)關(guān)系。模擬結(jié)果可為填料盤數(shù)量及高度的確定提供理論指導(dǎo)。最后,結(jié)合冷態(tài)實(shí)驗(yàn)及模擬結(jié)果開展冬季工況填料性能熱態(tài)實(shí)驗(yàn)。通過對SKB-350Y、7090濕簾、多面空心球及空塔四種工況下送風(fēng)溫度、加濕量、傳熱/傳質(zhì)系數(shù)及制熱/加濕性能系數(shù)的綜合分析,得到7090濕簾的綜合性能最優(yōu),對應(yīng)的體積傳質(zhì)系數(shù)和傳熱系數(shù)分別為4.37 kg/m3/s和23.83 W/m2/℃。結(jié)果表明規(guī)整填料綜合性能優(yōu)于散裝填料,空塔工況性能最差,但單獨(dú)從傳熱或傳質(zhì)角度考慮,三種填料各有所長,實(shí)驗(yàn)結(jié)果對機(jī)組設(shè)計(jì)中不同填料的應(yīng)用具有一定的借鑒意義。此外,通過實(shí)驗(yàn)還確定了溶液濃度與液位之間存在的函數(shù)關(guān)系,據(jù)此可實(shí)現(xiàn)機(jī)組運(yùn)行過程中濃度的可視化及實(shí)時(shí)調(diào)控。
[Abstract]:With the deepening of energy saving and emission reduction and the improvement of indoor air quality requirements, the new air conditioning unit has gradually entered the market. However, the wetting performance of the solution and the uniformity of air flow in the tower are not studied at the present time. It is defined as the research goal, combining the experimental analysis and the numerical simulation method to carry out the research. First, a heat pump heat pump heat pump new wind turbine unit with a rated air volume of 500 m3/h is designed and its feasibility is analyzed. The unit is composed of five parts: solution circulation system, heat pump system, wind system, electric control system and test system. The characteristic is that the dynamic balance of the solution concentration is realized through the design method of single solution slot, and the energy balance of the heat pump system is realized through the 6 kW auxiliary condenser. Through the analysis of the lgp- h diagram of the system and the related technology research, the feasibility of the design scheme of the unit is further determined and the construction of the test platform is completed. Secondly, the actual system is completed. After the test platform was completed, the cold experiment was carried out, mainly including the wind system, the water system and the heat pump system. First, the test bench was sealed. The test results of the air leakage rate of the system were within + 20%, and the reliability of the experimental data could be ensured. Then the airflow uniformity in the tower was carried out through the drift belt, the smoke tracing and chemical color rendering method. Qualitative and quantitative analysis is carried out. Through the water system experiment, the function relationship between the optimum opening number and the flow rate of the distributor is determined. According to the experimental results, the flow coefficient of the gravity type drain pipe distributor is about 0.56. heat pump system debugging mainly including the auxiliary condenser opening, the closing state, the expansion valve opening adjustment, and the pump and fan flow regulation. The optimal interval of the opening degree of the expansion valve is obtained by debugging. The optimal control strategy for each subsystem of the experimental platform can be formulated by 2.5-3.5. according to the cold test results. Thirdly, the optimal placement and optimization strategy of the packing are determined by the numerical simulation method. Four simulation conditions are made. The simulation results show that the uniformity of air flow in the tower is the best, and the key factor affecting the air distribution is the arrangement of the chassis and the structure parameters. The concept of the transition layer of the airflow uniformity is defined according to the comparison results of the four working conditions, and the height of the transition layer is carried out. The function relationship between the optimal height of the transition layer and the wind speed of the cross section of the packing tower is obtained. The simulation results can provide theoretical guidance for the determination of the number and height of the packing plate. Finally, the thermal experiments of the packing performance in the winter conditions are carried out with the cold state experiment and the simulation results. The four kinds of SKB-350Y, 7090 wet curtain, multi surface hollow sphere and empty tower are carried out. The comprehensive analysis of air supply temperature, humidification, heat transfer / mass transfer coefficient and heat / humidification coefficient of the 7090 wet curtain is obtained. The corresponding volume mass transfer coefficient and heat transfer coefficient are 4.37 kg/m3/s and 23.83 W/m2/ respectively. The results show that the comprehensive properties of the structured packing are better than the bulk packing, but the performance of the air tower is the worst, but the performance of the air tower is the worst. From the viewpoint of heat transfer or mass transfer alone, the three kinds of fillers have their own advantages. The experimental results have certain reference significance for the application of different packing in the design of the unit. In addition, the relationship between the concentration of solution and the liquid level has been determined through the experiment. Accordingly, the visualization and real-time control of the concentration in the operation of the unit can be realized.
【學(xué)位授予單位】：安徽工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU831

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