HIGH-PERFORMANCE COATING MATERIALS

SUGAMA,T.

关键词: BRINES;    CALCITE;    CAPITAL;    CARBON STEELS;    CLEANING;    COATINGS;    CORROSION;    ECONOMICS;    GEOTHERMAL POWER PLANTS;    MAINTENANCE;    OXIDATION;    SCHEDULES;    SILICA;    STAINLESS STEELS;    TITANIUM ALLOYS;   

DOI  :  10.2172/909954
RP-ID  :  BNL--77900-2007-IR
PID  :  OSTI ID: 909954
Others  :  R&D Project: 05171
Others  :  Other: EB4005030
Others  :  TRN: US200723%%297

美国|英语

来源: SciTech Connect

【 摘 要 】

Corrosion, erosion, oxidation, and fouling by scale deposits impose critical issues in selecting the metal components used at geothermal power plants operating at brine temperatures up to 300 C. Replacing these components is very costly and time consuming. Currently, components made of titanium alloy and stainless steel commonly are employed for dealing with these problems. However, another major consideration in using these metals is not only that they are considerably more expensive than carbon steel, but also the susceptibility of corrosion-preventing passive oxide layers that develop on their outermost surface sites to reactions with brine-induced scales, such as silicate, silica, and calcite. Such reactions lead to the formation of strong interfacial bonds between the scales and oxide layers, causing the accumulation of multiple layers of scales, and the impairment of the plant component's function and efficacy; furthermore, a substantial amount of time is entailed in removing them. This cleaning operation essential for reusing the components is one of the factors causing the increase in the plant's maintenance costs. If inexpensive carbon steel components could be coated and lined with cost-effective high-hydrothermal temperature stable, anti-corrosion, -oxidation, and -fouling materials, this would improve the power plant's economic factors by engendering a considerable reduction in capital investment, and a decrease in the costs of operations and maintenance through optimized maintenance schedules.