【摘要】：煤層注水是防治煤與瓦斯突出的重要技術(shù)措施之一,但是目前對其防突機(jī)理的認(rèn)識并不深入,主要表現(xiàn)之一就是對注水影響煤的瓦斯解吸效應(yīng)存在分歧,本文針對該問題主要采用實驗研究和理論分析的方法對外加壓力液對含瓦斯煤解吸特性的影響進(jìn)行研究。在實驗煤樣的制備、煤樣基礎(chǔ)參數(shù)測試以及表面活性劑優(yōu)選的基礎(chǔ)上,利用自制的高壓注水煤層氣恒溫解吸實驗臺,對不同注水壓力、不同吸附平衡壓力、不同注入溶液以及不同變質(zhì)程度煤樣的瓦斯解吸過程進(jìn)行了測試,然后,測試了不同注水壓力下煤樣的含水率、殘存瓦斯含量和孔隙結(jié)構(gòu)特征,并結(jié)合宏觀的實驗現(xiàn)象和理論分析,從微觀上探討了外加壓力液對含瓦斯煤解吸特性的影響機(jī)理。實驗結(jié)果表明:(1)加壓注水后,瓦斯的累計解吸量和解吸速度均降低,并且注水壓力越大,降低幅度越大,煤樣含水率和殘存瓦斯含量越大;除微孔孔容在注水前后變化不明顯外,煤樣的大孔、中孔和小孔孔容在注水后都增大,其總孔容、平均孔徑和孔隙率也出現(xiàn)不同程度的增加;綜合分析后認(rèn)為壓力水?dāng)U孔產(chǎn)生的毛細(xì)管力降低作用小于孔隙尺度加深產(chǎn)生的毛細(xì)管力增加作用,毛細(xì)管力整體增大,對瓦斯解吸過程的阻礙作用增強(qiáng),導(dǎo)致壓力水抑制瓦斯解吸作用更為明顯;(2)吸附平衡壓力越大,煤樣吸附瓦斯量就越大,而且注水過程對壓力水的阻礙作用越強(qiáng),壓力水能夠進(jìn)入的孔隙尺度越大,毛細(xì)管力則越小,對瓦斯解吸的抑制作用越弱,累計解吸量和解吸速度也就越大;(3)和注純水相比,注復(fù)配的表面活性劑溶液AES+CaCl_2(0.4+0.4)增大了毛細(xì)管力,進(jìn)入的孔隙尺度更深并且解吸過程阻力更大,對瓦斯解吸的抑制作用更強(qiáng),累計解吸量和解吸速度也就越小;(4)煤的變質(zhì)程度越高,吸附瓦斯的能力越強(qiáng),其吸附量就越大,注水后更易形成較高壓力的瓦斯氣體,克服毛細(xì)管阻力的能力越強(qiáng),累計解吸量和解吸速度也就越大。
[Abstract]:Water injection in coal seam is one of the important technical measures to prevent coal and gas outburst, but the understanding of its mechanism is not deep. One of the main manifestations is the disagreement on the effect of gas desorption on the effect of water injection. This paper mainly adopts the method of experimental research and theoretical analysis to add pressure liquid to gas coal. On the basis of the preparation of the experimental coal samples, the testing of the basic parameters of coal samples and the optimization of the surface active agents, the gas desorption process of different water injection pressure, different adsorption equilibrium pressure, different injection solution and different metamorphic coal samples was made on the basis of the experimental coal sample preparation, the test of coal sample base parameters and the optimization of the surface active agent. After testing, the water content of coal samples under different water injection pressure, residual gas content and pore structure characteristics are tested, and combined with macroscopic experimental phenomena and theoretical analysis, the influence mechanism of applied pressure liquid on the desorption characteristics of gas containing coal is discussed from microcosmic. The experimental results show that (1) the accumulative desorption amount of gas after pressurized water injection The greater the water injection pressure, the greater the water injection pressure, the greater the reduction, the greater the water content and the residual gas content of the coal samples; the large pores, mesoporous and pore volume of coal samples increase after water injection, and the total pore volume, the average pore size and porosity also increase in different degrees except for the pore volume in the water injection. After analysis, the effect of capillary force reduction produced by pressure water enlargement is less than the increase of capillary force resulting from the deepening of pore scale, the capillary force is increased as a whole, the hindering effect of gas desorption process is enhanced, and the effect of pressure water to suppress gas desorption is more obvious; (2) the greater the pressure of adsorption equilibrium, the larger the coal sample is to adsorb gas. Moreover, the more the water injection process has hindered the pressure water, the larger the pore size is, the smaller the pore size of the pressure water, the smaller the capillary force, the weaker the inhibition of the gas desorption, the greater the accumulative desorption and desorption speed. (3) the capillary force is increased by the surfactant solution AES+CaCl_2 (0.4+0.4), which is injected and mixed with pure water. The deeper pore size and greater resistance to the desorption process, stronger inhibition of gas desorption, the smaller the accumulative desorption and desorption speed; (4) the higher the degree of coal modification, the stronger the ability to adsorb gas, the greater the adsorption capacity, the more easily formed gas gas after water injection, and the stronger the ability to overcome the capillary resistance. The greater the amount of absorption and desorption is.
【學(xué)位授予單位】：華北科技學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD713.3

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