Study On Multi-Meshes Coupled Cathodes Enhanced Performance Of Electrochemical Water Softening System

The stability of the industrial circulating cooling water system is an important prerequisite for the normal operation of industrial production.Fouling is one of the main problems that destabilize the circulating water system.Fouling can cause problems such as pipe blockage,reduced heat transfer efficiency,and corrosion under scale.Fouling causes abnormal shutdowns of equipment and huge waste of energy and materials,and even leads to serious safety and environmental accidents.The electrochemical descaling technology is called"environmentally friendly"technology,which is simple in operation,effective in descaling and does not cause secondary pollution to the environment.While electrochemical descaling technology has an irreplaceable advantage,low descaling rates and high electrode area requirements limit the application of this technology.In this paper,the multi-meshes coupled cathodes enhanced the descaling performance of electrochemical descaling device was systematically studied.First,research on the case of commercial electrochemical descaling devices.Since the descaling rate of the device is too low,the number of descalers used in the circulating water system?3 units?is much smaller than the number of descalers required?23 units?,resulting in serious scaling in the circulating water system.Thereafter,in order to increase the descaling rate,a multilayer composite mesh cathode was invented.The cathode has a large specific surface area,and the actual working area of the cathode is not reduced by the deposition of scale.The electrode structure and the anode-anode arrangement are optimized.The descaling rate was the highest when the number of layers of the cathode was 7 and the cathode and the anode were arranged in close parallel.The coupled cathode increases the descaling rate of electrochemical water softening system due to the produced self-synergy effect based on its unique multilayer structure.The synergistic effect is constructed by separating and positioning the chemical reactions?alkalinity production and scale deposition?to different regions of the coupled cathode,thus a large amount of OH^-ions from the internal layers and the preferentially deposited scale on external layers accelerate the subsequent scale deposition in later stage of the process.Subsequently,the performance of the novel water softening device with multi-meshes coupled cathodes was verified.The results show that the descaling rate of the new descaling equipment is as high as 29.2 g/m²h,and the energy consumption and energy consumption are reduced to 6.0 kWh/kg CaCO₃.The novel descaling device has a 2-10 times higher descaling rate than the published literature domestic and foreign,and the energy consumption is reduced by more than 3 times.On this basis,a pilot test was carried out to test the electrochemical water softening device performance.The descaling rate of the pilot descaling device is as high as 27 g/m²h.The electrochemical descaling device can maintain the stable state of the water without scaling.Electrochemical descaling device can increase the concentration factor to 15.5,prolong the sewage discharge cycle,and achieve the purpose of water saving.For the cleaning of scales such as calcium carbonate and magnesium hydroxide on the surface of the cathode,it is proposed to carry out cathode regeneration by a high-pressure water jet.Finally,according to the results of the pilot test,an industrial application plan was given for a rubber company's circulating water system,and the technology was economically evaluated.The implementation of this project can effectively control the scaling and corrosion of circulating water,and save economic costs 256,600 yuan/year,saving industrial water 390,000 tons/year.