| Abstrakt: |
Orthogonal experiments of L16 (45 ) were conducted to study the effect of permanent magnetic field on water association in circulating water. The operation parameters include the magnetic field intensity, initial concentration of Ca2+ and Mg2+, magnetic treatment time, temperature and water flow velocity. The chemical shift, alkalinity, relative variation of activation energy and concentrations of Ca2+ and Mg2+ were used as the optimization objectives. Applying the relevant analysis method, the dominance degrees of influence factors for four objectives were analyzed, and the optimum condition was obtained. Furthermore, the effects of ion concentration and magnetic field intensity on water association were analyzed. The optimum condition was obtained as 900 mg/L of initial concentration, 0.5 T of magnetic field intensity, 303 K of temperature, 54 h of time and 0.17 m/s of water flow velocity. The results show that the operation parameters have different effects on water association. Water association increases with increase of magnetic field intensity. High concentration Ca2+ and Mg2+ can strengthen water association, and the effect of Mg2+ on water association is greater than that of Ca2+. High concentration of HCO3- and CO32- can break water clusters and decrease water association. [ABSTRACT FROM AUTHOR] |
