溶液除湿空调系统再生器性能研究

发布时间：2018-03-04 18:07

  本文选题：溶液除湿　切入点：再生器　出处：《天津商业大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着我国社会经济、科技水平的不断发展和提高，人们对生活质量和工业生产效率的追求也在不断提高，尤其是近几年雾霾天气出现频繁，环境日趋恶劣。在这种条件下，传统空调已经不能满足人们的需求了，而且传统空调系统造成能量的浪费。基于此一些专家提出了温湿度独立控制空调系统，实现温湿度独立控制的方法之一是利用溶液除湿。溶液除湿空调系统不必将空气冷冻到露点温度以下，可在较高温度下实现对空气的处理，并且盐溶液对空气具有杀菌、消毒的作用，提高了空气品质。但对处理空气进行除湿以后，盐溶液的浓度减小，除湿能力下降，要想能够循环使用，必须得对盐溶液进行再生，使其重新具有吸湿能力。盐溶液在再生过程中可以利用高温烟气、工业余热、太阳能等低品位能源，减少能源消耗。 本文对溶液除湿空调系统中的再生器进行了理论研究。通过传热传质分析，建立了再生器的数学模型，通过理论计算，分析了进口溶液温度、进口溶液浓度、液气比、进口空气温度和含湿量等因素对进出口空气含湿量差、出口溶液温度以及进出口溶液浓度差的影响，绘制了影响曲线。 本文再生器采用逆流填料塔的形式，采用LiCl溶液作为再生溶液，对溶液除湿空调系统再生器采用正交实验法设计了实验方案，在再生器实验台上布置了测点，采集实验数据，并对实验数据进行了整理，用极差和方差方法分析了实验结果，得到影响再生器单位空气再生量、出口溶液温度的各个因素的影响程度排列顺序，得到了在本实验所设的条件下，实验结果最优的运行工况；随机选取了几组实验工况，模拟计算出了相应的单位空气再生量，，并与实验结果进行了对比，分析了误差可能存在的原因。 通过理论与实验研究，得到如下结论： (1)单位空气再生量随着进口溶液温度、液气比的增加而增加；随着溶液进口浓度以及空气进口含湿量的增加而减小；随着空气进口温度的变化较为平缓； (2)进口溶液温度是单位空气再生量的主要影响因素，在今后的实验过程中要加以注意；进口空气温度对单位空气再生量的影响较弱； (3)对出口溶液温度影响最大的因素是进口溶液温度和液气比； (4)在本实验条件下，单位空气再生量最大的实验方案组合是：进口溶液温度是76℃，进口溶液浓度是30%，液气比为2.5，进口空气温度及含湿量分别为36℃和12g/kg； (5)选取一组实验工况，根据实验结果计算得到单位空气再生量为17.61g/kg，能量效率s为79.76%。
[Abstract]:With the development and improvement of our social economy and science and technology, people's pursuit of quality of life and industrial production efficiency is also increasing, especially in recent years, haze weather appears frequently and the environment is getting worse. Traditional air conditioning can no longer meet the needs of people, and the traditional air conditioning system causes energy waste. Based on this, some experts put forward the independent control of temperature and humidity air conditioning system. One of the ways to realize the independent control of temperature and humidity is to dehumidify by using solution. The air can be treated at a higher temperature by the solution desiccant air conditioning system without freezing the air below the dew point temperature, and the salt solution can sterilize the air. Disinfection improves air quality. But after dehumidifying the treated air, the concentration of the salt solution decreases, and the dehumidification capacity decreases. To be able to recycle, the salt solution must be regenerated. In the process of regeneration salt solution can utilize low-grade energy such as high temperature flue gas industrial waste heat solar energy and so on to reduce energy consumption. In this paper, the regenerator in the solution desiccant air conditioning system is studied theoretically. Through the analysis of heat and mass transfer, the mathematical model of the regenerator is established, and the temperature of the inlet solution, the concentration of the inlet solution and the ratio of liquid to gas are analyzed by theoretical calculation. The influence curves of inlet air temperature and moisture content on the difference of moisture content in inlet and outlet air, the temperature of outlet solution and the concentration difference of inlet and outlet solution are drawn. In this paper, the regenerator adopts countercurrent packing tower and LiCl solution as the regenerative solution. The experimental scheme of the regenerator of the solution desiccant air conditioning system is designed by orthogonal experiment method. The measuring points are arranged on the regenerator test table and the experimental data are collected. The experimental data are sorted out, and the experimental results are analyzed by the method of range difference and variance. The order of the influence degree of the factors affecting the regenerator unit air regeneration quantity and outlet solution temperature is obtained. The optimal operating conditions of the experimental results are obtained under the conditions of this experiment, and several groups of experimental conditions are randomly selected to simulate and calculate the corresponding unit air regeneration rate, and the results are compared with the experimental results. The possible causes of errors are analyzed. Through theoretical and experimental research, the following conclusions are obtained:. 1) the regenerative capacity of unit air increases with the temperature of the inlet solution, decreases with the increase of the inlet concentration of the solution and the moisture content of the inlet air, and with the change of the inlet temperature of the air, the change of the ratio of liquid to gas is relatively gentle. (2) the temperature of inlet solution is the main factor affecting the regeneration amount of unit air, which should be paid attention to in the future experiment, and the influence of imported air temperature on the regeneration quantity of unit air is weak. (3) the most important factors affecting the outlet solution temperature are the inlet solution temperature and the liquid-gas ratio. (4) under the experimental conditions, the maximum regeneration amount per unit air was as follows: the inlet solution temperature was 76 鈩

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