次高温高压煤变形产气装置及试验

Experiments and testing apparatus for gas generation through coal deformation under sub-high temperature and sub-high pressure

为了研究次高温高压条件下、在变形作用过程中煤是否发生化学变化而产生气体以及产气机理和规律,研制了-种次高温高压煤变形产气试验装置,并对装置密封、气体观测收集等关键技术难点进行了分析.该试验装置主要由加载系统、密封反应釜系统、温控加热系统以及气体观测收集系统4 个部分组成.最大加载轴压为100 MPa,最高加热稳定温度200 ℃,试样尺寸为Φ50 mm×100 mm.该装置具有如下特点：气密性良好,并可长时间进行恒温恒压加载,最长可连续加载360 h;结构简单,易操作,成本低,系统可靠性高.试验初期,利用该装置对两种不同煤级煤进行轴压10~50 MPa,温度100 ℃和150℃的变形产气试验,得到不同温度、不同压力条件下煤的变形产气特征.试验结果表明,该试验装置为煤变形产气的相关试验研究提供了有效的手段,具有较大的实用价值.

A sub-high-temperature and sub-high-pressure testing apparatus has been developed, which can be used to study the issue if there is a chemical structure change and gas generation during coal deformation process. Some key technical issues have been further analyzed, such as sealing process, gas observation and collection techniques. The apparatus mainly consists of loading system, sealing system, controlling and heating system and gas observation and collection system. The maximum axial pressure is 100 MPa and the heating temperature can reach as high as 200 ℃. The dimensions of tested cylinder samples are Φ50 mm×100 mm. There are some advantages of the testing apparatus:(1) It is air-tight and the loading time can reach as long as 360 h.(2) It operates easily and costs less, moreover, its structure is simple and reliability is high. The coal deformation experiments have been carried out using this apparatus under axial pressure of 10~50 MPa and the heating temperature of 100℃ and 150℃. And the characteristics of the generation of gas have been obtained. It is shown that the testing apparatus can provide a effective and practical method for coal deformation experiments.