PASP、PAA与PBTCA阻垢性能的对比实验研究

采用静态阻垢法研究了聚天冬氨酸(PASP)、聚丙烯酸(PAA)和2-膦酸基丁烷-1,2,4-三羧酸(PBTCA)对碳酸钙和硫酸钙的阻垢性能,并用旋转挂片法研究了3种阻垢剂作用下湿法石灰脱硫浆液系统的结垢规律.研究发现:随着阻垢剂浓度的增加,3种阻垢剂都表现出溶限效应;相同实验条件下,3种阻垢剂对碳酸钙的静态阻垢性能表现为PBTCA>PAA>PASP;对中性和碱性环境,pH对阻垢剂阻硫酸钙垢的性能影响较小;随着温度的升高和反应时间的延长,3种阻垢剂阻硫酸钙的阻垢率先增大后减小;对湿法石灰脱硫浆液系统,3种阻垢剂作用下,单位面积挂片上的结垢量均是随着阻垢剂质量浓度的增大先增大后减小,在浓度达到30mg/L时,挂片上的结垢量都很小.

Comparison of scale-inhibiting properties of polyaspartic acid,polyacrylic acid and 2-phosphonobutane-1,2,4-tricarboxylic acid

By means of Static Scale-inhibiting method, the scale-inhibiting properties of polyaspartic acid (PASP), polyacrylic acid (PAA) and 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) were determined. Simultaneously, scaling laws under these inhibitors were researched by rotation specimen method. Results showed that these inhibitors had threshold effect as the dosage of inhibitors increasing. The order of scale inhibition effects against CaCO3 of three inhibitors was as follows: PBTCA>PAA>PASP. When pH>7.0, pH had little impact on scale inhibition effects against CaSO4 of these inhibitors. As water-bath temperature increasing and residence time extending, scale inhibition effects against CaSO4 of these inhibitors increased at first, and then decreased. In wet Flue Gas Desulphurization System with Lime, all the scaling mass of hanging on-chip unit area increased at the beginning, and then decreased when the dosage of these scale inhibitors increased. With their dosage of 30mg/L, the scaling mass of hanging on-chip unit area of PASP, PAA and PBTCA was very small.