Evaluation of volatile behavior and the volatilization volume of molten salt in DIR-MCFC by the image measurement technique

熔盐的挥发是影响熔融碳酸盐燃料电池（MCFC）性能的主要因素之一。熔盐的挥发促进了金属部件的交叉泄漏和腐蚀。此外，管道堵塞是由挥发性物质的固化引起的。特别是在直接内重整熔融碳酸盐燃料电池（DIR-MCFC）中，由于填充阳极通道的重整催化剂被熔融盐挥发物污染，熔融盐的挥发是一个重要的课题。然而，熔融盐挥发物的行为和挥发量均未阐明，因为具有强碱性的熔融盐挥发物不能直接供给至分析器，其挥发量小，并且分析精度差。因此，试图通过使用非接触式图像测量技术来阐明蒸发的碱金属氢氧化物的行为。DIR-MCFC电解质一般 ...更多信息 y 62Li_2CO_3/38K_2CO_3。考虑如下的DIR-MCFC催化剂污染机理。熔盐挥发性物质是当电池与电解质反应时产生水时产生的KOH。在高CO_2浓度区，生成的KOH又返回K_2CO_3，K_2CO_3粘附在催化剂上造成催化剂污染。此外，K_2CO_3颗粒在生成水成为粘结材料时相互粘结，堵塞了管涌。本文采用图像测量技术，对KOH的挥发量，即从KOH到K_2CO_3的转化行为、K_2CO_3的颗粒生长进行了实验评价。在测定KOH挥发量时，在电炉坩埚中加热挥发的KOH与CO_2反应生成K_2CO_3，然后注入反应管。K_2CO_3的量是通过用YAG激光器和CCD照相机测量K_2CO_3颗粒的图像来测量的，由此从K_2CO_3量的化学计量的计算获得KOH挥发体积。在从KOH到K_2CO_3的转变过程中，通过对KOH和CO_2在较长时间内生成的K_2CO_3颗粒进行拍照，可以明确K_2CO_3颗粒的生长过程。结果，大颗粒与相互粘附的小颗粒一起产生，该颗粒生长累积，导致管道堵塞。少

The volatilization of molten salt is one of factors that control the performance of Molten Carbonate Fuel Cells (MCFC). Volatilization of molten salt promotes the cross-leakage and corrosion of metallic components. Moreover, piping blockage is caused by the solidification of volatile matter. Especially, because reforming catalysts filling the anode channel are polluted by molten salt volatile matter in Direct Internal Reforming Molten Carbonate Fuel Cells (DIR-MCFC), volatilizing of the molten salt is a weighty subject. However, neither the behavior nor the volatilization volume of molten salt volatile matter has been elucidated upon, because molten salt volatile matter that has strong alkalinity cannot be supplied directly to an analyzer, its volatilization volume is small, and analytical accuracy is poor. Therefore, an attempt was made to elucidate about the behavior of vaporized alkali hydroxide by using a non-contact image measurement technique. The DIR-MCFC electrolyte is generall … More y 62Li_2CO_3/38K_2CO_3. Consideration was given to the DIR-MCFC catalyst pollution mechanism of as follows. Molten salt volatile matter is KOH generated as water is generated when the cell reacts with electrolytes. Generated KOH returns to K_2CO_3 again in high CO_2 concentration regions, catalyst pollution being caused by the adherence of the K_2CO_3 to the catalyst. Moreover, the K_2CO_3 particle mutually coheres when generated water becomes bonding material and blockades the piping. The present report experimentally evaluates the volatilization volume of KOH, which is the behavior which changes from KOH to the K_2CO_3, particulate growth of K_2CO_3, using the image measurement technique. In measuring the KOH volatilization volume, K_2CO_3 is generated as KOH volatilized by heating it in a crucible in an electric furnace reacts with CO_2, and is then injected into a reaction tube. The amount of K_2CO_3 is measured by measuring the image of the K_2CO_3 particle with a YAG laser and CCD camera, thereby obtaining the KOH volatilization volume from the calculation of the stoichiometry of the amount of K_2CO_3. In behavior that changes from KOH to K_2CO_3, the particulate growth of K_2CO_3 can be clarified by taking a picture of a K_2CO_3 particle generated with KOH and CO_2 for an extended period. As a result, a large particle is generated with the mutual adhesion small particles, which particulate growth is accumulated, causing piping blockage. Less