Study on Generating Acoustic Emission with Heating Coal for Application as Monitoring System for Underground Coal Gasification
Study on Generating Acoustic Emission with Heating Coal for Application as Monitoring System for Underground Coal Gasification
复制标题
DOI：
10.1088/1755-1315/861/2/022036
复制
发表时间：
2021-10
期刊：
影响因子：
--
通讯作者：
A. Hamanaka;Y. Makabe;K. Itakura;T. Sasaoka;H. Shimada;N. Widodo;B. Sulistianto;G. Deguchi
中科院分区：
文献类型：
--
作者：
A. Hamanaka;Y. Makabe;K. Itakura;T. Sasaoka;H. Shimada;N. Widodo;B. Sulistianto;G. Deguchi
煤炭地下气化（UCG）是一种通过钻孔和原位气化来回收可燃气体的技术。建立安全的煤炭地下气化系统需要对气化反应区域进行监测，因为发生在地下的气化过程是一个看不见的事件。由于煤炭加热导致煤层发生大量压裂活动，声发射（AE）监测被认为是监测地下气化区的有效技术。因此，利用煤加热实验研究了AE产生的温度条件，并检验了AE测量作为UCG监测方法的适用性。在煤样加热过程中，使用热电偶和加速度传感器测量温度变化和声发射事件。因此，当煤的温度发生变化并在靠近热源的传感器中检测到时，就会发现许多AE事件。另外，根据AE源位置分析结果，AE源随着高温区域的扩大而广泛扩展。通过在煤炭地下气化过程中应用AE测量监测，可以监测煤炭的温度变化和高温区域的扩大。
Underground Coal Gasification (UCG) is a technology to recover combustible gases by drilling holes and in-situ gasification. The establishment of a safe UCG system requires monitoring of the gasification reaction area because the gasification process that occurs in the underground is an invisible event. It is considered that Acoustic Emission (AE) monitoring is an effective technique for monitoring the underground gasification area since many fracturing activities occur in the coal seam due to coal heating. Therefore, the temperature condition of AE generations is investigated using the coal heating experiments and examines the applicability of AE measurement as a monitoring method for UCG. Measurements of temperature change and AE events with the thermocouples and the acceleration transducers during the coal specimen were heated. As a result, many AE events are found when the temperature of coal is changed and detected in the sensor where its location was near the heat source. Additionally, AE sources are expanded widely with the expansion of the high-temperature region based on the analysis results of the AE source location. It is possible to monitor the temperature change of coal and the expansion of the high-temperature region by applying AE measurement monitoring during UCG.