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SCALE CONTROL IN GEOTHERMAL SYSTEMS

机译:地热系统的规模控制

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摘要

Scaling and corrosion that reduce the efficiency of turbines and heat exchangers are two of the majorrnproblems affecting energy recovery from hot water geothermal systems. The types of scale commonlyrnfound include calcium carbonate, amorphous silica and silicates, and mixed metal oxides and sulfides.rnCalcium carbonate deposition can occur very quickly when a relatively high supersaturation is reachedrnas a result of C02 removal. Silica deposition takes place mainly on surface equipment and in injectionrnwells. In most cases, the use of scale inhibitors is necessary to prevent deposition. Some of theserninhibitors, however, may become part of the problem due to thermal decomposition. This not onlyrnmakes them ineffective but also creates decomposition products, which may form deposits or berncorrosive to metal surfaces. This paper presents the laboratory test results of a thermally stable,rnphosphorus and sulfur-free calcium carbonate inhibitor.
机译:结垢和腐蚀降低了涡轮机和热交换器的效率,这是影响热水地热系统能量回收的两个主要问题。通常发现的水垢类型包括碳酸钙,无定形二氧化硅和硅酸盐,以及混合的金属氧化物和硫化物。当由于除去CO 2而达到相对较高的过饱和度时,碳酸钙的沉积会很快发生。二氧化硅的沉积主要发生在地面设备和注入井中。在大多数情况下,必须使用阻垢剂以防止沉积。但是,由于热分解,某些阻滞剂可能会成为问题的一部分。这不仅使它们失效,而且会产生分解产物,可能形成沉淀物或腐蚀金属表面。本文介绍了一种热稳定,无磷,无硫的碳酸钙抑制剂的实验室测试结果。

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