Research Of Electrochemical Anti-fouling Technology On Heat Transfer Equipment

Recently,heat exchange equipments have been widely used in industry and household fields.The limescale on pipe inner walls of heat exchangers causes the low heat transferring efficiency and high the consumption of fuel,while polluting the environment.Besides,the scale accelerates the rate of erosion,and even causes an explosion.In consideration of safety,the energy efficiency and the environment protection,it has significance to have a further study of descaling.The characteristics and influences of scale are studied in this paper.The mechanism of various physical and chemical descaling technologies are analyzed and classified.That is reducing the concentration of scale-forming ions and changing the scale's structure to make it removable.The theories of low voltage electronic descaling and zinc-copper alloy(KDF)descaling technologies are studied in this paper.The low voltage electronic descaling technology accelerates the scale rate and precipitate out on the canoed to descale and antiscale by using DC power,which releases electrons into water from the anode,and accumulates the mass cation around the cathode correspondingly.In the zinc-copper alloy(KDF)descaling technology,the potential difference between zinc and copper form the primary cell to force the zinc cation into water,and then scaling anion combine with zinc cation to reduce scaling ions,with the scale changed into washable aragonite owing to the existence of zinc electronic.The experiment on the low voltage electron descaling and zinc-copper alloy(KDF)descaling technologies are done by designing experiment scheme and establishing experiment platform,which proving the descaling efficiency and analyzed the SEM and XRD images.In addition,the influence of voltage values and plate distance to descaling has been studied through low voltage electron experiment.Based on the operating principle of zinc-copper alloy(KDF)descaling tecnology,the alloy consisted of four elements is designed which can form multiple micro-electrochemical cell.Similarly,zinc-electrode pulse electrolysis descaling technology which can release zinc electronic into water to remove scaling ions is proposed through the principle of the low voltage electron descaling and zinc-copper alloy(KDF)descaling technologies.In this method,the square-wave pulse provides energy to zinc pole to force the zinc cation out,while the mass cation are accumulated around the cathode and combine with the anion dissolved out from cathode.As the zinc electronic existent in the water,the aragonite on pipeline inner walls can be easily washed away.The theoretical analysis and experiment on multi-component zinc-copper alloy and zinc-electrode pulse electrolysis descaling technologies are preceded.The descaling efficiency is verified by designing the experiment scheme and establishing the experiment platform.Then the SEM and XRD images are analyzed.And the descaling efficiency is compared between the KDF and the self-made multi-component zinc-copper alloy.The influence of voltage value and electrode distance on descaling efficiency is studied in the experiment of zinc-electrode pulse electrolysis descaling technology.