A Study On The Influence Law Of Scaling Material On Scaling Deposition Rate

Based on the idea of “changing passive fouling into active fouling”,agglomeration and scaling devices used for rapid descaling of gathering and transportation pipelines have a good application effect on site.How to improve the descaling effect is the key to the development of agglomerated and scaling technology.At present,the optimization of the material of the over-flow unit of the aggregate fouling device is limited to metal materials,and the qualitative analysis of the influence of the type of metal materials on fouling.The mechanism of the influence of the surface properties of non-metallic materials and materials on crystallization fouling is still unclear.In this paper,through experimental and theoretical analysis,the influence of non-metallic materials and surface physical properties on the scale deposition rate is studied,in order to provide experimental and theoretical basis for the optimization of the aggregated scale device.Firstly,through dynamic simulated shear experiments,the qualitative analysis of the influence law and mechanism of different non-metallic material surface properties on the growth of Ca CO3 crystallization fouling;secondly,through the loop experiment,explore the influence of the surface properties of 9 materials on the friction factor Law,and based on dimensional analysis and SPSS regression analysis,the function relationship between surface physical properties(contact angle)and friction factor under different flow conditions is fitted;again,uniform design and regression analysis are used to establish contact angle and surface energy and roughness Mathematical correlation model,and build a dirt deposition rate correction model including surface physicochemical properties parameters;Finally,through the accumulation of scale simulation loop,the dirt deposition rate correction model was experimentally verified.The experimental and theoretical analysis results show that:(1)there are large differences in the fouling performance of different materials,among which the FRP has the largest fouling per unit area and the PTFE has the smallest fouling per unit area;(2)the surface wettability The surface free energy and surface roughness are closely related to the amount of fouling,fouling distribution,crystal growth,etc.,which together affect the fouling performance of the material.Among them,the surface with good wettability,high surface energy and large roughness not only has large scale and the scale layer is densely connected in a sheet form;(3)the deviation between the measured value and the calculated value of the friction factor proves that its size isaffected by the physical properties of the surface of the material.Among them,the greater the contact angle,the lower the surface energy,the smaller the roughness,the smaller the friction factor of the material;(4)established a dirt deposition rate correction model,which can quantitatively reflect the contact angle,surface energy,and roughness of the material surface The relationship between the physical property parameters and the scaling rate has been verified to be in line with reality.