To shorten the development period of suitable anti-scaling technology for individual geothermal plants, it is necessary to improve the precision in evaluating the scaling technology through laboratory testing. Therefore, in this study we investigated a method to imitate the structure of magnesium silicate scale that has precipitated in Obama Hot Spring in Nagasaki Prefecture, Japan. Magnesium silicate hydrates were synthesized in an artificial solution at 100°C under different environments (i.e., carbon dioxide, nitrogen, and atmosphere). The synthesized solutions with magnesium silicate hydrates were flowed to the inner surface of a carbon steel pipe, and the scaling propensity of magnesium silicate was evaluated. Among the samples, the ones synthesized under the carbon dioxide environment have a similar structure with the field magnesium silicate scale and exhibited high scaling propensity. We believe that the findings are useful to eliminate the gap between the characteristics of field scaling and laboratory testing.

为缩短个别地热电厂适用的防垢技术的开发周期，有必要通过实验室测试提高防垢技术评价的精度。因此，在本研究中，我们研究了一种模拟日本长崎县小滨温泉中沉淀的硅酸镁水垢结构的方法。在不同环境（即二氧化碳、氮气和大气）下，在 100°C 的人工溶液中合成硅酸镁水合物。将合成的硅酸镁水合物溶液流到碳钢管的内表面，评价硅酸镁的结垢倾向。在样本中，在二氧化碳环境下合成的那些与现场硅酸镁结垢具有相似的结构，并表现出较高的结垢倾向。我们相信这些发现有助于消除现场缩放和实验室测试特征之间的差距。