【摘要】 以实际的电厂循环水为对象，研究了低磷阻垢剂(KURITA ST-8690)的浓度对电解除垢过程中循环水的pH值、硬度去除率、碱度去除率以及阴极沉垢量的影响。结果表明：阻垢剂可显著降低实际循环水的pH值，抑制电解除垢过程，并且阻垢剂浓度越大，电解循环水的硬度去除率、碱度去除率和阴极沉垢量越小。扫描电子显微镜(SEM)、能谱仪(EDS)和X射线衍射(XRD)的测试结果表明，阻垢剂直接参与了阴极成垢过程，阻垢剂的浓度越大，阴极垢质中文石型碳酸钙的含量越高，阴极垢质结构越疏松。经对比发现，阻垢剂的浓度变化对电解实际循环水与模拟循环水的影响规律基本相同，表明在实验室通过研究模拟循环水的电解除垢规律来评价实际循环水的电解除垢效果是可行的，这为电解循环水除垢工艺的实验室优化及推广应用创造了有利条件。更多还原

【Abstract】 The effect of varying the concentration of a low-phosphorus scale inhibitor(KURITA ST-8690) on the pH value, hardness removal rate, alkalinity removal rate and cathode scale deposition of the actual circulating water of power plant in the process of electrolytic descaling has been studied. The results show that adding the scale inhibitor can significantly reduce the pH value of the actual circulating water. The addition of the scale inhibitor can inhibit the electrolytic descaling process, and higher concentrations of the scale inhibitor result in reduced hardness removal rate, alkalinity removal rate and cathode scale deposition for the electrolytic circulating water. Scanning electron microscopy(SEM), energy dispersive spectrometry(EDS) and X-ray diffraction(XRD) show that the scale inhibitor is directly involved in the cathode scaling process. Higher concentrations of the scale inhibitor result in higher contents of aragonite phase calcium carbonate in the cathode scale as well as looser cathode scale structures. The influence of the concentration change of the scale inhibitor on the actual circulating water could be closely modeled using simulated circulating water. This indicates that it is feasible to evaluate the electrolytic descaling effect in actual circulating water by studying the electrolytic descaling behavior of simulated circulating water in the laboratory. The results of this study should facilitate the laboratory optimization and application of the electrolytic circulating water descaling process.更多还原