外液侵入对含瓦斯煤体瓦斯解吸影响实验研究
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摘要
随着人们对瓦斯研究和认识的逐步深入,已经由传统的致灾对象逐步转变为资源开采与利用对象,瓦斯抽采技术也因此成了人们研究的重点,所获得的阶段性成果在现场之中也得到了一定程度上的应用。然而,受思想观念、地质条件以及抽采技术等多种因素的影响,瓦斯抽采技术并没有得到有效的推广应用,其中一个很重要的原因是瓦斯抽采效率比较低所致,这也导致了在实施抽采之后工作面在回采过程中瓦斯超限现象仍然存在。据此,结合石油天然气勘探与开采研究领域所给的启示,从提高瓦斯抽釆效率和防止工作面瓦斯超限两个关键问题出发,开展了外液侵入对含瓦斯煤体瓦斯解吸影响方面的实验研究,旨在为解决以上两个关键问题提供一个新思路和新途径。
     结合目前瓦斯解吸领域实验设备现状和研究问题的需要,自主研发了外液侵入过程中含瓦斯煤体的瓦斯解吸测定装置,以及外液侵入后含瓦斯煤体的瓦斯解吸测定装置,即液置气和水锁实验装置。在此基础上,分别开展了外液侵入过程中瓦斯解吸测定实验,以及带压和常压条件下有、无外液侵入后的瓦斯解吸对比实验。
     通过外液侵入过程中瓦斯解吸实验,揭示了含瓦斯煤体在JFC渗透剂溶液侵入过程中液置气现象,给出了液置气明显程度与JFC渗透剂溶液浓度以及瓦斯吸附平衡压力水平之间的关系,进而从界面吸附的角度出发,阐释了液置气产生的原因。通过带压与常压条件下有、无外液侵入后的瓦斯解吸对比实验,揭示了水和浓度为0.025%JFC渗透剂溶液侵入后水锁现象,以及其对瓦斯解吸量和解吸释放速度的影响,表明水锁形成后会减少瓦斯的解吸与释放量,同时也会延缓瓦斯解吸释放速度,进而阐释了水锁产生的条件和机理。根据实验分析结果,结合工裎实际,给出了利用液置气来提高瓦斯抽采效率的新思路,以及利用水锁来防止工作面瓦斯超限的新途径。
     本论文的创新之处在于:自主研发了外液侵入过程中瓦斯解吸实验测定装置和外液侵入后瓦斯解吸实验测定装置,丰富了瓦斯解吸研究领域的实验设备条件;揭示了外液侵入过程中液置气现象和外液侵入后水锁现象,以及其对瓦斯解吸的影响规律,阐释了各自产生的原因和机理;从提高瓦斯抽采效率和防止工作面瓦斯超限两个关键问题出发,给出了解决问题的新思路和途径。
     该研究对提高瓦斯抽采效率和防止工作面瓦斯超限灾害发生,具有一定的学术参考和应用价值。
AJong with people research and understand on gas, already rfom traditional object ofleading to disaster to the object of resource mining and using, gas extraction technologybecomes the study emphasis of people for this reason, the zchievements of the current stagehave been applied in gas extraction to some degrees. However, by the influence of vairousfactors, for example thought ideas and geological conditions and extraction technology ect, gasextraction technology didn't get effective application, the one important reason is gasextraction efifciency is low,this lead to the phenomena of gas over limit still exist duringmining on coal face atfer implement of extraction. In the view of the above, combined with theenlightenment rfom oil and gas research field, start rfom the two key problems, they areimproving gas extraction eiffciency and preventing gas over limit, carry out the experimentstudy of external solution invasion impact on gas desorption about coal with gas, the purpose isto provid a new thought and a new way to solve the above two problems.
     Combine with current situation of experimental facilities in gas desorption field and theneed of study, autonomously research and development the expeirment device about gasdesorpiton of coal with gas during external solution invasion, and the experiment device aboutgas desorption of coal with gas atfer external solution invasion, they are expeirment devices ofliquid replaces gas and water lock. Based on this, separately carired out gas desorpitonexperiment during external solution invasion, and gas desorption contrast experiments aboutexternal solution invasion or no extenral solution invasion in the condition of pressure oratmospheric pressure.
     Through the experiment of gas desorption during external solution invasion, conifrmed thephenomenal of liquid replaces gas exist during JFC penetrant solution intrude into coal withgas, summarized the relation between the obvious degree of liquid replaces gas and JFCpenetrant solution concentration and gas adsorption balance pressure level, and then start rfomthe point of view of interface adsorption, analysed the generated reason of liquid replaced gas.Through the gas desorption contrast experiments about extenral solution invasion or noexternal solution invasion in the condiiton of pressure or atmospheric pressure, conifrmed thewater lock exist atfer water and0.025%concentration penetrant solution intrude into coal withgas, and the water lock impact on gas desorption quantity and desorption speed, the resultsshow that water lock can reduce gas desorpiton and release quantity, and can delay gasdesorption and release speed at the same time, and then analysed water lock generatedconditions and mechanism. According to experiment analysis results, combine with engineering practice, put forward the new thought of using liquid replaces gas to improve gasextraction efifciency, and the new way of using water lock to prevent gas over limit on coalface.
     The innovates of paper is: autonomously research and development the experiment deviceabout gas desorption of coal with gas during external solution invasion and atfer externalsolution invasion, enrich experiment equipment conditions in the gas desorption study ifeld;conifrmed the phenomenal of liquid replaces gas exist during external solution intrude into coalwith gas’ and the water lock exist after external solution intrude into coal with gas, analysedtheir generated reason; started rfom the two key problems of improve gas extraction eiffciencyand prevent gas over limit on coal face, put forward the new thought and new way to solve thequestions.
     The study has a certain academic reference and application value to improve gasextraction efficiency and prevent the disaster occuring of gas over limit on coal face.
引文
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