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电渗析脱盐率预测模型研究
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摘要
电渗析法是以离子交换膜为分离介质,在直流电场的作用下,以电位差为推动力,能够有效去除水体中的无机盐。本文介绍了应用于实验室规模电渗析装置的实验数据、模糊模型(FL)、数学模型(MM )。目的是用来预测电渗析的脱盐率(SP ),脱盐率为浓度、温度、流速和电压的函数。
     首先,主要是以离子在直流电场作用下发生电迁移传质为基础,根据电化学基本方程和电渗析的膜孔径传质平衡建立含盐废水脱盐率数学模型。实验考察电压、流量、温度以及进料浓度对电渗析装置的影响。应用实验脱盐率值计算出数学模型参数α值。利用回归程序,推导出数学模型参数α与进料浓度、电压、温度和流量的关系式,进而计算出数学模型参数α的理论值。从而计算出脱盐率的理论值。
     针对数学模型在预测中存在的不足,以及影响电渗析工艺脱盐效果因素的复杂性等特点,应用Sugeno模糊逻辑推导机理建立NaCl溶液离子脱盐率模糊模型用于电渗析中,借助Matlab软件中的ANFIS功能进行训练测试,应用ANFIS中的混合学习方法确定隶属度函数,估算高斯隶属函数的参数c和σ以及结果函数,通过与实验数据及数学模型进行比较,对模型的预测能力进行验证分析,结果模糊模型的预测值和实验值之间有很好的吻合性,平均相对误差(MSRE)小于0.01。实验表明该模型具有较强的预测能力和实用性,ANFIS较适合用来建立电渗析中的参数间映射关系模型,数学模型的主要优点是通过两个与脱盐率有关的参数α、β表现出来的,其中α和电渗析的操作条件有关,β和电渗析的水力尺寸有关。这样数学模型可以按比例扩大应用范围。然而,根据数学模型的MSRE(大约为0.0397),数学模型不可能像模糊模型一样很好的预测实验数据。
Ion-exchange membrane is the crital medium of electrodialysis technology, under the directly electric field, with the potential difference as the driving force, effectively removed inorganic salts ionize in water solution. This paper presents experimental data, a fuzzy logic (FL) model, a mathematical model (MM) for a laboratory scale electrodialysis (ED) cell. The aim was to predict Removal rate as a function of concentration, temperature, ?ow rate and voltage.
     At first, according to the property that ion electromigration happens on the external electric field, using an electrodialysis(ED) channel mass balance and fundamental electrochemical equations, a mathematical modeling was applied to model sepration from brine waste using ED. Experiments were conducted to investigate the effect of voltages, flow rates, temperature and feed concentrations on ED cell performance and the model parameter was calculated using sepration in the dilute compartment. Using experimental data, the equation was fitted forαas a function of voltage, flow rate, temperature and feed concentrations. Using multiple regression procedure, the model gives the values of sepration in the dilute compartment for various voltages, flow rates, temerature and feed concentrations.
     Regarding to the existing MM for predicting, and analyzing the factors that affecting ED process demineralization, a Sugeno type FL inference system was applied to model NaCl ions separation using ED, training and testing was accomplished with the aid of MATLAB software, ANFIS methodology whit hybrid learning method was applied to identify membership function, estimate the parameters c andσof the applied two-parametric Gaussian membership function and the consequent functions. Compared with experimental data and MM, predictive power of a model was tested and analysed, FL modeling results showed that there is an excellent agreement between the experimental data and the predicted values, with mean squared relative error (MSRE) of less than 0.01. Expeiments show the model pccupies preferable predication performance and practicability, ANFIS is very well suited for the parameters mapping modeling of electrodialysis, Then, the results of a previously developed MM were presented. The MM related SP to hydrodynamic dimension of the ED cell and operation conditions via two distinct parametersαandβ. This ability favored the MM for scale-up applications. However, based on MSRE of the MM (about 0.0397), it could not obviously predict the experimental data as well as FL.
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