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针对地热水环境中金属管道和设备常见的结垢问题,采用图像二值化处理法、扫描电子显微镜、能谱仪、电化学测试等方法对比研究了304不锈钢管、环氧有机硅涂层、聚苯硫醚(PPS)涂层和聚四氟乙烯(PTFE)/PPS复合涂层在静态模拟地热水中的阻垢性能。结果表明:地热水中不同涂层表面结垢物质的微观形貌为“针”形物,组成主要为CaCO3;PTFE/PPS涂层的表面能低于单纯的PPS涂层,可以有效地抑制结垢晶核在其表面的形成;实验10天的PTFE/PPS涂层表面的结垢质量为304不锈钢管表面结垢质量的37.3%;同时,PTFE/PPS涂层在模拟地热水中具有较好的耐蚀性。
Aiming at the common scaling problems of metal pipes and equipment in geothermal water environment, the methods of image binarization, scanning electron microscopy, energy dispersive spectroscopy and electrochemical tests were used to study the effects of 304 stainless steel tube, epoxy silicone coating , Polyphenylene sulfide (PPS) coating and polytetrafluoroethylene (PTFE) / PPS composite coating in static simulated geothermal water. The results show that the microscopic morphology of the fouling substances on the surface of different coatings in geothermal water is “Acupuncture”, the main component is CaCO3; the surface energy of PTFE / PPS coating is lower than pure PPS coating, which can be effective The scale formation on the surface of the PTFE / PPS coating on the 10-day experiment was 37.3% of the surface fouling on the 304 stainless steel tube; meanwhile, the PTFE / PPS coating on the surface of the simulated geothermal water In the better corrosion resistance.