型煤吸附不同气体变形规律研究
Study on Deformation Laws of Briquette Coal Under Adsorbing Different Gases
-
摘要: 为了探讨型煤吸附不同压力下的CH4、N2以及CO2的变形特征，利用自行研发的高压瓦斯煤岩吸附-解吸测试系统，对型煤在吸附这3种气体过程中的变形规律进行了研究。结果表明：型煤在不同压力下吸附不同气体的过程都包含抽真空变形、吸附膨胀变形和解吸附压缩变形等3个阶段，且吸附3种气体的膨胀变形规律相似，其轴向变形与环向变形均随时间的增大而逐渐增大；吸附膨胀变形过程中的应变-时间关系都符合Langmuir方程形式；在相同温度和吸附质压力条件下型煤对3种气体的吸附膨胀变形由大到小依次为CO2、CH4、N2；型煤吸附这3种气体膨胀变形过程中的环向应变要大于轴向应变，且随着压力的增大2个方向的变形差异增大。Abstract: In order to explore the deformation characteristics of briquette coal adsobing CH4, N2 and CO2 under different pressure, this paper studies the deformation laws of briquette coal in the adsorption process of these three kinds of gas by using the adsorption-desorption test system for high-pressure gas coal rock. The results show that: the adsorption process for different gases of briquette coal under different pressure includes 3 stages, such as vacuum deformation, adsorption swelling deformation and desorption compression deformation, and the swelling deformation law of three kinds of gase is similar; the axial deformation and circumferential deformation are increasing gradually. The strain-time relation in the process of adsorption swelling deformation accords with the form of Langmuir equation. The adsorption expansion deformation of briquette coal to three kinds of gas under the same temperature and adsorption pressure is from big to small in order of CO2, CH4, N2. The annular strain of the three kinds of gas expansion and deformation is larger than the axial strain, and the deformation difference increases with the increase of the pressure in two directions.
-
-
[1] 何学秋.含瓦斯煤岩流变动力学[M].徐州:中国矿业大学出版社,1995. [2] C. özgen Karacan. Swelling-induced volumetric strains internal to a stressed coal associated with CO2 Sorption[J]. International Journal of Coal Geology, 2007, 72(3-4): 209-220. [3] A. L. Goodman, R. N. Favors, M. Structure Changes in Pittsburgh No. 8 Coal Caused by Sorption of CO2 Gas[J]. Energy & Fuels, 2005, 19(4): 1759-1760. [4] 白冰,李小春,刘延锋,等.CO2-ECBM中气固作用对煤体应力和强度的影响分析[J].岩土力学,2007,28(4):823-826. [5] 吴世跃,赵文,郭勇义.煤岩体吸附膨胀变形与吸附热力学的参数关系[J].东北大学学报(自然科学版),2005,26(7):683-686. [6] Pan Z, Connell L D. A theoretical model for gas adsorption-induced coal swelling[J]. International Journal of Coal Geology, 2007, 69(4): 243-252. [7] 周军平,鲜学福,姜永东,等. 基于热力学方法的煤岩吸附变形模型[J].煤炭学报,2011,36(3):468-472. [8] 刘延保,曹树刚,李勇,等.煤体吸附瓦斯膨胀变形效应的试验研究[J].岩石力学与工程学报,2010,29(12):2484-2491. [9] Satya Harpalani, Richard A. Schraufnagel. Shrinkage of coal matrix with release of gas and its impact on permeability of coal[J]. Fuel, 1990, 69(5): 551-556. [10] Majewska Z, Zi?誰tek J. Acoustic emission and sorptive deformation induced in coals of various rank by the sorption-desorption of gas[J]. Acta Geophysica, 2007, 55(3): 324-343. [11] Van Bergen F, Spiers C, Floor G, et al. Strain development in unconfined coals exposed to CO2, CH4 and Ari: effect of moisture[J]. International Journal of Coal Geology, 2009, 77(1): 43-53. [12] Kiyama T, Nishimoto S, Fujioka M, et al. Coal swelling strain and permeability change with injecting liquid/supercritical CO2 and N2 at stress-constrained conditions[J]. International Journal of Coal Geology, 2011, 85(1):56-64.
计量
- 文章访问数:
- HTML全文浏览量: 0
- PDF下载量: 0
下载:
