DEVELOPNENT OF HIGH TEMPERATURE TYPE HYOROGEN DETECTOR BY USING SOITD ELECTROLYTE

在以炼油厂为代表的化工厂，高压氢气在高温下被处理，氢气溶解到钢中，与碳或碳化物反应形成甲烷泡，有时会导致钢的损坏。为了提前捕捉这种危险，需要开发利用固体电解质的高温型氢探测器。通过三年的项目研究，取得了以下成果：(1)采用SrCeO_3固体电解质包覆铂膏，研制了该探测器的电解部分。(2)电子部分由我们自行研制，不接受任何噪音。(3)成功地进行了半年以上的长期测量，并确认获得了可重复的氢气渗透率及其扩散系数。(4)如果周围存在过量的氧气，则由于固体电解质中出现空穴电导，探测器不能正常工作。审议了它的对策。(5)为了从计算机测得的渗氢率中了解钢的损伤危险程度，从已发表的文献中提取数据库。(6)下一阶段有望将该探测器应用于实际工厂。

At the chemical plants typified by oil refineries in which high pressure hydrogen gas is treated at high temperature, the hydrogen dissolves into a steel, reacts with carbon or carbide to form the methane bubble and sometimes results in the damage of steel. In order to catch such reskness in advance, the high temperature type hydrogen detector is required to develop by using solid electrolyte. From three year's project, the following results was obtained :(1) The electrolytic part of such detector was developed by using SrCeO_3 solid electrolyte covered by platinum paste.(2) The electronic part was developed by ourself not to accept any noise.(3) The long term measurement over half year was performed successfuly and was confirmed to get the reproducible hydrogen permeability and its deffusion coefficient.(4) If exess oxygen exist in surrounding it, the detector did not operate normaly due to occurrence of hole conductance in solid electrolyte. Its counterplan was considered.(5) In order to understand the reskness of damage of steel from the measured hydrogen permeability by computer, the data base was mode from the collection of published literatures.(6) It is a hope to appliy such detector to the actual plant in next stage.