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Corrosion evaluation and prevention of reactor materials to contain thermochemical material for thermal energy storage

机译:腐蚀评估和防止反应堆材料含有用于热能储存的热化学材料

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摘要

Thermochemical materials (TCM) can be used for seasonal heat storage, storing high amounts of thermal energy coming from the sun in summer and releasing it in winter, when heating for houses is needed. One promising TCM for building comfort applications is the Na2S/water pair due to its high energy density and appropriate reaction temperature that can be achieved by a solar collector. Nonetheless, Na2S reacts with oxygen and is corrosive to metals, especially with those used to build up heat exchangers or reactors that contain the TCM. Therefore, corrosion tests in a self-developed experimental setup under vacuum conditions, 13 mbar, between Na2S⋅9H2O/5H2O and two reactor metals – copper and stainless steel 316 – have been performed. Since copper is corroded and is highly used for thermochemical reactors, two promising coatings, Halar and electroless nickel, have been applied. Furthermore, aluminium has also been tested coated with these coatings. Halar is a potential candidate to protect both copper and aluminium heat exchangers/reactor that may contain Na2S/H2O pair for thermochemical energy storage. Stainless steel 316 is also corrosion resistant to the selected TCM.
机译:热化学材料(TCM)可用于季节性储热,在夏天,当需要为房屋供暖时,可存储大量来自太阳的热能,并在冬天释放热能。 Na2S /水对是一种用于建筑舒适应用的有前景的TCM,因为它具有高能量密度和太阳能收集器可以达到的适当反应温度。但是,Na2S与氧气反应并腐蚀金属,特别是与那些用于构建包含TCM的热交换器或反应器的金属。因此,在自行开发的实验装置中,在Na2S·9H2O / 5H2O和两种反应堆金属(铜和不锈钢316)之间的真空条件下(13毫巴)进行了腐蚀试验。由于铜被腐蚀并在热化学反应器中得到高度使用,因此已应用了两种有前途的涂层:Halar和化学镍。此外,铝也经过了测试。 Halar是保护铜和铝换热器/反应器的潜在候选者,这些换热器/反应器可能包含Na2S / H2O对用于热化学能存储。不锈钢316也对所选TCM具有抗腐蚀性。

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