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Characteristics of gas pressure change during the freezing process of gas-containing coal
Energy Exploration & Exploitation ( IF 2.7 ) Pub Date : 2022-01-06 , DOI: 10.1177/01445987211073178
Jun Liu 1, 2 , Yanzhao Wei 2 , Wei Wang 3 , Luwei Zhang 2 , Jinqi Wu 4
Affiliation  

To investigate the characteristics of gas pressure changes during the freezing of gas-containing composite coal, an experimental device for determining the freezing response characteristics of gas-containing coal was independently designed. Coal samples with different firmness coefficients from the No. 3 coal seam in Yuxi Coal Mine in Jincheng, Shanxi Province, were selected to determine the different freezing response characteristics. The gas pressure evolved under different temperatures (-10 °C-15 °C-20 °C-25 °C-30 °C) and different adsorption equilibrium pressures (1.0 MPa, 1.5 MPa, 2.0 MPa). The research results reveal that, during the freezing process of the gas-containing coal sample, the gas pressure in the coal sample tank changed as a monotonously decreasing function and underwent three stages: rapid decline, decline, and slow decline. The relationship between the gas pressure of the coal sample tank and the freezing time is described by a power function. Low temperatures promoted gas adsorption. As the freezing temperature decreased, the decrease of gas pressure in the coal sample tank became faster. During the freezing process, the adsorption capacity of soft coal was larger, and the gas pressure of soft coal was lower.



中文翻译:

含气煤冻结过程中气体压力变化特征

为研究含气复合煤冻结过程中气体压力的变化特征,自主设计了一种测定含气煤冻结响应特性的实验装置。选取山西晋城玉溪煤矿3号煤层不同硬度系数的煤样,确定不同的冻结响应特性。气体压力在不同温度(-10°C-15°C-20°C-25°C-30°C)和不同吸附平衡压力(1.0 MPa、1.5 MPa、2.0 MPa)下演化。研究结果表明,在含气煤样冷冻过程中,煤样罐内气体压力呈单调递减函数变化,经历了快速下降、下降和缓慢下降三个阶段。煤样罐的气体压力与冻结时间的关系用幂函数来描述。低温促进气体吸附。随着冷冻温度的降低,煤样罐内气体压力下降速度加快。在冷冻过程中,软煤的吸附量较大,而软煤的气体压力较低。

更新日期:2022-01-06
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