| Scale problem is a key problem to many fields of social life. The water scale isnot only harmful for human health but also making the industrial heat efficiencyreduced, what’s worse is it can cause horrible potential safety hazard. The scaleproblem roots on using hard water. The circumvolute electronic pulse watertreatment (CEPWT) system is a very useful electromagnetic field water treatmentsystem to the scale problem, and is used to solve the scale problem in the industrialwater and people daily water field. But the anti-fouling mechanism of CEPWTsystem is still not all clear as yet. Therefore it is scarce of theoretical direction tomake a good use of CEPWT system, which makes the anti-fouling performanceunstable. The research purpose of the present thesis is improving the anti-foulingmechanism of CEPWT system, and based on the improved mechanism the methodof CEPWT system‘s key parameter optimization will be researched, which can give atheoretical direction for optimizing CEPWT system‘s anti-fouling function.The optimization of CEPWT system‘s anti-fouling function is the core problemof this thesis. For solving the controversial problems of the CEPWT system‘santi-fouling function, the influence to the change of microcosmic particles structurein the hard water solutions by AC electric field is researched by using systematiclong time non-equilibrium molecular dynamics (MD) simulation; for solving thecurrent situation of lacking theoretical direction for using CEPWT system, amathematical model of CEPWT system is built, and based on this mathematicalmodel and debye-huckel theory the method of CEPWT system‘s key parameteroptimization is obtained. This method can give an important theoretical direction fora high-efficiency using of the CEPWT system in practice.In order to solve lacking the research of the influence to the change ofmicrocosmic particles structure in the hard water solutions by AC electric field, inthe present thesis systematic long time (1112-2500ns) non-equilibrium moleculardynamics (MD) simulation has been carried out to study structural and dynamicalproperties of hydrated Ca2+and water molecules in CaCl2aqueous solutions with anexternal AC electric field produced by the CEPWT system, and analysed how thechange of structural and dynamical properties can affect the calcium carbonatecrystallizing process, which can explain the anti-fouling mechanism of CEPWTsystem from micro perspective.In order to solve the problem of lacking an accurate control method for theCEPWT system and lacking the theoretical direction for choosing the optimal watertube material and excitation signal, in the present thesis a mathematical analytical modeling of CEPWT system is built and simplified based on the system features.This analytical modeling can describe the working progress of CEPWT system inthe whole time domain. The optimal water tube material is chosen by studying themagnetic field distribution using finite element method. Further more amathematical method is used to simplify the solving progress of the analyticalmodeling of CEPWT system, and based this method, the optimal waveform ofexcitation signal is chosen.For building a relationship between CEPWT system‘s key parameter andsystem‘s anti-fouling function, an approximate analytical modeling of inducedcurrent for electronic anti-fouling technology is deduced. Then based on theimproved anti-fouling mechanism of CEPWT system which is obtained from theprevious chapters, the key factors which can influence the anti-fouling effect ofCEPWT system, and electrolyte solution theory, the method of CEPWT system‘skey parameter optimization is abtained, which can be used to optimize the CEPWTsystem‘s anti-fouling function. A series of experiments were carried out, and theexperiment results prove that the the method of CEPWT system‘s key parameteroptimization can accurately reflect the quantitative relation between CEPWTsystem‘s key parameter and system‘s anti-fouling function. |
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