电容去离子法海水淡化流程的模拟与优化

发布时间：2018-06-16 23:38

本文选题：电容去离子 + 海水淡化　；参考：《大连理工大学》2014年硕士论文

【摘要】：水资源的缺乏使海水淡化技术的研发更加紧迫。与传统的反渗透和低温多效蒸发海水淡化技术相比,电容去离子技术作为新兴的脱盐技术,具有能耗低、无污染等优势,拥有广阔的发展前景。本文首先对比分析了类一级反应动力学模型与摩尔净化速率模型。结果表明,类一级反应动力学模型适用范围小,由于其物理意义不明确,实用性有限；摩尔净化速率模型物理意义明确,可用于研究各因素对过程的影响,更适用于过程的模拟与分析,并对模型再生阶段电阻进行修正,使其更加吻合实际情况。根据选取的模型,分别研究了参数对最小出水浓度及最小出水浓度时间的影响。结果表明,最小出水浓度随着电压与电容的增大而减小,随着流量、流道体积以及死区体积的增大而增大；最小出水浓度时间随着流量增大而减小,随着电容以及死区体积的增大而增大。为了降低过程能耗,提出分段电压模型,通过编程分别计算单模块、双模块以及三模块的出水情况,对比能耗,结果表明三模块和双模块与单模块相比能耗分别降低26.80%和12.22%。为了控制死区体积,进行了流场分析。建立了三种波纹状优化结构,进行了模拟优化分析,并且研究了流速对流场的影响。结果表明,壁面的几何结构简单化以及在一定范围内采用低流速可以弱化死区的形成。运用摩尔净化速率模型,进行了日处理量50吨的电容去离子海水淡化模块化工程设计。得到了海水淡化流程如下：通道串联数目为10的装置共20个,同时运行,充液2.5min,通电工作10min,然后反向通电静置3min进行再生,最后排污2.5min,完成一个处理循环。
[Abstract]:The lack of water resources makes the research and development of desalination technology more urgent. Compared with traditional reverse osmosis and low-temperature multi-effect evaporation desalination technology, capacitive desalination technology, as a new desalting technology, has the advantages of low energy consumption and no pollution, and has a broad development prospect. In this paper, the first order reaction kinetic model and the molar purification rate model are compared and analyzed. The results show that the first-order reaction kinetic model has a small application range, because of its unclear physical meaning and limited practicability, and the molar purification rate model has a clear physical meaning, so it can be used to study the influence of various factors on the process. It is more suitable for the simulation and analysis of the process, and modifies the resistor in the regenerating stage of the model to make it more consistent with the actual situation. According to the selected model, the effects of parameters on the minimum effluent concentration and the minimum effluent concentration time were studied. The results show that the minimum effluent concentration decreases with the increase of voltage and capacitance, and increases with the increase of flow rate, flow channel volume and dead zone volume, and the minimum effluent concentration time decreases with the increase of flow rate. It increases with the increase of capacitance and dead zone volume. In order to reduce the energy consumption of the process, a piecewise voltage model is put forward, and the effluent conditions of one module, two modules and three modules are calculated by programming, and the energy consumption is compared. The results show that the energy consumption of the three modules and two modules is reduced by 26.80% and 12.22%, respectively, compared with that of the single module. In order to control the dead zone volume, the flow field is analyzed. Three corrugated optimization structures were established, simulated and optimized, and the effect of flow velocity on the flow field was studied. The results show that the geometric structure of the wall is simplified and the formation of the dead zone can be weakened by the use of low velocity in a certain range. Based on the molar purification rate model, the modularization engineering design of deionized seawater desalination with a capacity of 50 tons per day was carried out. The process of seawater desalination is as follows: 20 units with 10 channels in series, running at the same time, filling liquid for 2.5 minutes, working for 10 minutes, then reverse-electrifying static 3min to regenerate, finally discharging water for 2.5 minutes, completing a treatment cycle.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P747

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