Effect of permanent magnetic field on water association in circulating water

Orthogonal experiments of L 16 (4 5 ) 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 Ca 2+ and Mg 2+ , magnetic treatment time, temperature and water flow velocity. The chemical shift, alkalinity, relative variation of activation energy and concentrations of Ca 2+ and Mg 2+ 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 Ca 2+ and Mg 2+ can strengthen water association, and the effect of Mg 2+ on water association is greater than that of Ca 2+ . High concentration of HCO 3 – and CO 3 2– can break water clusters and decrease water association.