碳酸钙阻垢效果影响因素实验研究

为了研究多因素共同作用对碳酸钙阻垢效果的影响，采用静态阻垢法对筛选出的浓度为100 mg/L 的PESA阻垢剂开展了碳酸钙阻垢效果影响因素研究。首先，采用单因素分析法开展了阻垢剂类型、浓度、碳酸钙过饱和度、含盐量以及pH 值对碳酸钙阻垢效果的影响实验，然后，根据单因素实验结果设计正交实验，通过正交实验研究了含盐量、温度、CO2 分压和pH 值共同作用时对碳酸钙阻垢效果的影响。单因素实验结果表明，随着碳酸钙过饱和度的增大阻垢剂PESA 的阻垢率减小，随着含盐量的增大阻垢剂PESA 的阻垢率先增大后相对减小，随着pH 值的增大阻垢剂PESA 的阻垢率先增大后减小；临界含盐量为50 g/L 时，阻垢率可达95.85%；pH 值为6.5∼8.0 时阻垢效果最佳，阻垢率为90%。由正交实验结果可知，温度对PESA 阻垢剂的阻垢率影响最为显著，对应的极差为8.2，P 值为0.002，其次为pH 值和CO2 分压，而含盐量的影响作用微乎其微。最优因素水平组合为温度60℃、pH 值7.5、CO2 分压1.5 MPa、含盐量5.5 g/L，此时阻垢剂PESA 对碳酸钙的阻垢效果最好。

An Experimental Study on Factors Affecting the Effect of Calcium#br#Carbonate Scale Inhibition

In order to study the influence of the combined action of multiple factors on the calcium carbonate scale inhibition，100 mg/L of PESA screened out by static scale inhibition method were employed in the experimental research on thefactors affecting calcium carbonate scale inhibition. First，we studied the impact of inhibitor type，inhibitor concentration，supersaturation，salinity，and pH on calcium carbonate scaling inhibition separately by single factor analysis. Then orthogonalexperiment was designed based on the experimental results of different factors. The experiment studied the combined action oftemperature，salinity，partial pressure of CO2 and pH. The result of the single factor analysis showed that the scale inhibitionrate of PESA decreased as supersaturation increased，and climbed up first and then declined slowly as salinity or pH increased.Scale inhibition rate reached 95.85% at the critical salinity，which turned to be 50 g/L. And optimal inhibition rate was 90%when pH varied from 6.5 to 8.0. The result of the orthogonal experiment showed that temperature was the key factor on scaleinhibition rate with 8.2 Xbar-R and 0.002 P. Followed by pH and CO2 partial pressure，the influence of salt content was negligible.Finally，the optimum combination of influencing factors was obtained，and the analysis showed that 60 ℃，7.5 pH，1.5 MPa CO2 partial pressure，5.5 g/L salinity would produce the best scaling inhibition result.