低温低压脱硫废水蒸发物性模拟研究  

Simulation Study on Evaporation Properties of Desulfurization Wastewaterat Low Temperature and Low Pressure

作　　者：罗浩东 曾涛[2] LUO Haodong;ZENG Tao(China Energy Engineering Group Guangdong Electric Power Design Institute Co.,Ltd.,Guangzhou 510663,China;Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510610,China)

机构地区：[1]中国能源建设集团广东省电力设计研究院有限公司,广州510663 [2]中国科学院广州能源研究所,广州510610

出　　处：《内蒙古电力技术》2024年第3期89-93,共5页Inner Mongolia Electric Power

基　　金：中国能源建设集团广东省电力设计研究院有限公司科技项目“污废水热力闪蒸工艺的核心技术研发”(EV05171W)。

摘　　要：根据谱尼-脱硫废水水质分析,电厂脱硫废水中盐的主要种类为含Na^(+)、Mg^(2+)的氯盐,主要不溶物为CaCO_(3)。利用Aspen Plus软件对低温低压脱硫废水的蒸发特性进行数值模拟,结果显示,脱硫废水的泡点温度随着溶液含盐量的增大而升高;在相同的泡点温度下,NaCl溶液的质量分数要大于MgCl_(2)溶液以及两者的混合盐溶液的质量分数;随着溶液含盐量的增大,沸点升高值呈逐渐上升趋势;随着温度的升高,蒸汽压呈逐渐上升趋势;而随着溶液中盐浓度的升高蒸汽压呈下降趋势,均小于纯水蒸汽压,且温度越高与纯水在相应温度下的蒸汽压相差越多。数值模拟结果和文献中试验数据进行对比,结果显示,NaCl溶液模拟值与文献值基本相符,MgCl_(2)和NaCl混合盐溶液蒸汽压模拟计算值曲线在从文献中查找到的纯MgCl_(2)和纯NaCl溶液的曲线之间,证明此模拟方法拟合程度较高,可为实际应用提供指导。According to the analysis of the water quality of Puni desulfurization wastewater,the main types of salts in the desulfurization wastewater of power plants are chloride salts containing Na^(+)and Mg^(2+),and the main insoluble substance is calcium carbonate.This paper uses Aspen Plus software to numerically simulate the evaporation characteristics of low⁃temperature and low⁃pressure desulfurization wastewater,calculates the effects of different concentrations of NaCl and NaCl MgCl_(2) solutions on boiling point rise at 0.1 MPa,as well as the effects of NaCl solutions on vapor pressure at different concentrations and temperatures.The numerical simulation results show that the bubble point temperature of desulfurization wastewater increases with the increase of salt content.At the same bubble point temperature,the mass fraction of NaCl is greater than that of MgCl_(2) and their mixed salt solution.As the salt mass fraction increases,the boiling point increases gradually.As the temperature increases,the vapor pressure gradually increases.With the increase of salt concentration in the solution,the vapor pressure shows a downward trend,which is lower than the vapor pressure of pure water,and the higher the temperature,the more the difference between the vapor pressure value of pure water at the corresponding temperature is.The numerical simulation results are compared with the experimental data in the literature,and the results shows that the simulated values of NaCl solution are basically consistent with the literature values.The simulated values of MgCl_(2) and NaCl mixed salt solution are between the two literature values,proving that this simulation method has a high degree of fitting and can provide guidance for practical applications.

关 键 词：脱硫废水 低温低压 蒸发物性 Aspen Plus软件模拟 泡点温度 蒸汽压 

分 类 号：TM621.8[电气工程—电力系统及自动化] X773[环境科学与工程—环境工程]