稠油废水高倍蒸发浓缩污垢的形成和模拟

Simulation of Scale Formation During Viscous Oil Wastewater Evaporation and Concentration

摘要:

研究了稠油废水蒸发浓缩过程中污垢的形成规律.在蒸发浓缩的试验基础上，首先通过X射线衍射仪(XRD)和扫描电子显微镜(SEM)对污垢进行分析，确认污垢的晶体成分，然后据此建立3层析晶污垢的沉积模型，即由碳酸钙盐(如CaCO3)、复盐(如Na2CaSiO4, Ca8Si5O18)和硅酸盐(如Ca2SiO4)等形成的混合污垢的沉积模型.通过污垢热阻的模拟计算发现，污垢的主要组分是碳酸钙盐，其污垢热阻占总污垢热阻的91.76%；模拟结果与试验数据相吻合，说明3层析晶污垢模型可以描述稠油废水蒸发过程中的析晶结垢规律，为稠油废水蒸发过程中污垢的防治提供理论基础.

Abstract:

The behavior of scale formation during viscous oil wastewater evaporation process was investigated. Based on evaporation and concentration experiments, the composition of scale crystal was confirmed by X ray powder diffractometer (XRD) and scanning electron microscopy (SEM). According to the composition of wastewater scale, a three layer crystallization fouling deposit model was established, namely mixed fouling including calcium carbonate salt(CaCO3), compound salts (Na2CaSiO4, Ca8Si5O18) and silicate salt (Ca2SiO4). It is found that the fouling resistance mainly results from calcium carbonate salt, and it accounts for 91.76% of the total fouling resistance. The simulation results coincide with the experimental data. The three layer crystallization fouling model proves to be able to predict the scale formation process during viscous oil wastewater evaporation, and it provides a theoretical basis for preventing heat transfer surface fouling during evaporation of viscous oil wastewater.