AE法によるガスハイドレートの生成・分解の検知手法

抄録

In this study, the method of detecting the formation and the dissociation of gas hydrate using AE method was proposed. In the experiment, gas hydrate was formed on the surface of ice particles, which were placed in a copper container filled by propane gas. During the formation process, elastic waves are emitted due to the volume expansion of the ice/hydrate particles, which causes friction between the particle and wall of the container, and contact among the particles. During the dissociation process, elastic waves are emitted due to the melting of ice and formation of propane gas bubbles in the water, which are formed by the dissociation of the hydrate. As a result, it was confirmed that elastic wave can be measured both in formation and dissociation process. Moreover, it was found that the emission of elastic wave increases as the surface area of the ice/hydrate particles increases and the pressure of propane gas increases, because the mass of formed hydrate increases.