论文部分内容阅读
随着深部开采的推进,煤与瓦斯(甲烷)突出已成为安全高效采矿的重大隐患,煤中瓦斯赋存运移微细观作用机制试验研究至关重要。采用核磁共振T_2谱技术,以阜新盆地孙家湾矿高瓦斯高突煤层为例,试验研究煤样瓦斯吸附解吸核磁共振谱,模拟煤层瓦斯赋存和运移全过程。结果表明,吸附态、游离态和自由态瓦斯核磁共振T_2谱范围可由不同T_2截止阈值定量划分;吸附过程和解吸过程中,吸附态瓦斯量与瓦斯压力的关系符合朗格缪尔方程,而游离态瓦斯量与瓦斯压力成线性关系;吸附态瓦斯解吸过程表现出一定滞后性,且存在5.5 MPa临界滞后压力,游离态瓦斯解吸过程无明显滞后性。
With the development of deep mining, coal and methane (methane) prominence has become a major hidden danger of safe and efficient mining. It is very important to study the mechanism of micro-mechanism of gas migration in coal. Taking T 2 gas spectrum of nuclear magnetic resonance technology, taking the gas with high gas and high outburst in Sunjiawan Mine of Fuxin Basin as an example, the gas absorption and desorption nuclear magnetic resonance spectra of coal samples were studied and the whole process of gas occurrence and migration was simulated. The results show that the range of T 2 spectrum of gas NMR can be quantitatively partitioned by different T 2 cut-off thresholds in adsorbed, free and free states. The relationship between adsorbed gas and gas pressure accords with the Langmuir equation during adsorption and desorption, The linear relationship between gas pressure and gas pressure was obtained. The gas desorption process showed some hysteresis, and the critical hysteresis pressure of 5.5 MPa existed. There was no obvious lag in the desorption of free gas.