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| 裂缝形态影响下注热煤体升温及气体产出规律 |
| The law of fracture morphology on coal temperature rise and gas production under heat injection |
| Received:December 08, 2022 Revised:June 12, 2023 |
| DOI：10.7520/1001-4888-22-308 |
| 中文关键词: 注热 裂缝形态 分形维数 气体产出 |
| 英文关键词:heat injection crack morphology fractal dimension production of gas |
| 基金项目:国家自然科学基金面上项目(51874166)；辽宁工程技术大学学科创新团队资助项目(LNTU20TD-11) |
| Author Name | Affiliation | | LI Yan | School of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China | | LIANG Bing | School of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China | | SUN Weiji* | School of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China | | ZHAO Hang | School of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China | | ZHANG Junlin | School of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China |
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| 中文摘要: |
| 为研究裂缝形态对注热作用下煤样温度变化情况以及对煤中气体产出规律的影响，基于PCAS软件对裂缝形态进行了定性及定量分析，利用自主研制的裂缝煤样注热解吸渗流试验装置开展了室温条件下及注热条件下的煤样气体产出试验，并对注热作用过程中煤样的温度进行实时监测。研究结果表明，煤样的裂缝形态越复杂，煤样升温幅度越大且达到的稳定温度越高，煤样升温越快且温度上升的持续时间越久；平行于流体流动方向的单一裂缝一定时，垂直于流体流动方向的裂缝数目越多，裂缝形态越复杂，对室温条件下及注热条件下煤样气体产出的促进作用越强；注热作用下煤样温度与裂缝分形维数之间呈指数型拟合关系，向裂缝煤样中注热水，可以提高煤样温度，进而促进煤样中气体的产出，使气体产出量增加，且最大产出量可达未注热时量值的1.74倍；向无缝煤样中注入热水后，气体的产出总量较未注热时减少，而含缝煤样注热水后的气体产出总量较无缝时增加，说明裂缝的存在一定程度上可以削弱水锁效应带来的影响；气体产出总量与煤样温度及裂缝分形维数之间呈现三维曲面拟合关系，煤样的气体产出总量随着裂缝分形维数的增大及煤样温度的上升而增加。 |
| 英文摘要: |
| In order to study the influence of crack morphology on the temperature change of coal samples under heat injection and the gas production rule in coal, qualitative and quantitative analysis of crack morphology was carried out based on PCAS software. The coal sample gas production test under room temperature and heat injection conditions was carried out by using the self-developed thermal desorption seepage test device of the crack coal sample. The temperature of the coal sample during heat injection is monitored in real time. The results show that the more complex the fracture shape of the coal sample, the larger the temperature rise and the higher the stable temperature, the faster the temperature rise and the longer the duration of temperature rise. When the single crack parallel to the direction of fluid flow is constant, the more cracks perpendicular to the direction of fluid flow, the more complex the fracture morphology, and the stronger the promoting effect on coal sample gas production at room temperature and heat injection conditions. There is an exponential fitting relationship between coal sample temperature and fracture fractal dimension under heat injection. Injecting hot water into a crack coal sample can increase the temperature of the coal sample, and then promote the output of gas in the coal sample, and the maximum output of gas can reach 1.74 times of the value without heat injection. When hot water is injected into the seamless coal sample, the total gas output decreases compared with that without heat injection, while the total gas output of the seam coal sample increases compared with that without heat injection, indicating that the existence of cracks can weaken the influence of water lock to a certain extent. There is a 3D curved surface fitting relationship between the total gas output, coal sample temperature, and fracture fractal dimension, and the total gas output of the coal sample increases with the increase of fracture fractal dimension and coal sample temperature. |
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