石膏型卤水换热器中硫酸钙结垢规律研究

摘要

The scaling law of calcium sulfate in heat exchanger of gypsum type brine has been studied by means of hanger test.The effects of temperature and seeding on the rate of calcium sulfate scaling and scaling mass in the unit area of the simulated heat exchanger tubes were investigated.The results indicated that the mass of calcium sulfate scale formed in 60 d were 1.28,1.32,1.71,and 0.63 mg/cm2 without seeding at 35,45,55,and 65 ℃ respectively.While the scaling amounts at the corresponding conditions were 0.86,0.83,1.38,0.63 mg/cm2 respectively,with seeding of 10.3 g/L (mass concentration).Seeding had the inhibiting effect on the scale at 35,45,and 55 ℃,and seeding could shorten the initial inducement period of the calcium sulfate.The scale mass of unit area increased with the increase of temperature from 35,45,and 55 ℃,however,seeding had no effect on scaling at 65 ℃.%采用挂片实验对石膏型卤水在换热器中的硫酸钙结垢规律进行了研究,考察了加晶种条件与温度条件对模拟换热管上硫酸钙结垢速率及单位面积结垢质量的影响.结果表明,设备运行60天,35、45、55、65℃条件不加晶种单位面积硫酸钙结垢质量分别为1.28、1.32、1.71、0.63 mg/cm2,加品种质量浓度为10.3 g/L相应条件下单位面积硫酸钙结垢质量分别为0.86、0.83、1.38、0.63 mg/cm2;35、45、55℃条件加晶种对结垢起到抑制作用,缩短了硫酸钙结垢诱导期;35、45、55℃条件,随着温度升高单位面积结垢质量增大;65℃条件加晶种没有起到抑制结垢的作用.