本文選題：微波場作用 + 吸附　； 參考：《中國礦業(yè)大學(xué)》2015年碩士論文

【摘要】：預(yù)抽煤層瓦斯是礦井瓦斯災(zāi)害防治的有效方法之一,然而我國大部分煤層透氣性低、吸附瓦斯含量較高,使得煤層瓦斯抽采率普遍較低。因此,要想提高煤層瓦斯的抽采率就必須解決如何增加煤層透氣性、促進(jìn)煤體介質(zhì)內(nèi)微孔的吸附瓦斯解吸、加速自由瓦斯的擴(kuò)散的問題。根據(jù)電磁場對煤層瓦斯吸附解吸的影響特性,提出了微波場作用減小煤層瓦斯吸附、促進(jìn)煤層瓦斯解吸的新思路。本文通過開展微波場作用對煤層瓦斯吸附解吸特性影響的理論分析以及微波場作用對煤的孔隙結(jié)構(gòu)以及吸附解吸特性影響的實驗研究,得到了不同微波場條件下煤的孔隙結(jié)構(gòu)和吸附解吸特性的變化規(guī)律,并分析了微波場作用對煤的孔隙結(jié)構(gòu)及吸附解吸特性的影響機制,取得了如下研究結(jié)論:(1)微波場作用能夠使煤樣的比表面積和微孔孔容減小。(2)微波場作用后,煤樣的Langmuir常數(shù)a減小,且隨著微波場作用時間的增加,Langmuir常數(shù)a的變化不明顯,大體上為先減小、后輕微增大、再逐漸減小的趨勢;而吸附常數(shù)b的變化趨勢則相反,但與吸附等溫曲線的曲率的變化趨勢一致。(3)不同功率條件下微波場作用后的煤樣的甲烷吸附曲線的變化趨勢基本一致,且微波場作用改變了煤對甲烷的吸附能力,使煤樣的甲烷吸附量比無微波場作用的煤樣要小。(4)無微波場作用和微波場作用后的煤樣的甲烷放散特征曲線形式一致。在甲烷吸附量減少的情況下煤樣的甲烷放散速度略有增大或保持相同水平,表明微波場作用后的煤樣的甲烷放散能力有所增加。(5)微波場作用對煤體的孔隙結(jié)構(gòu)及瓦斯吸附解吸特性的影響機制主要表現(xiàn)為微波場對煤體的電磁輻射熱效應(yīng)與損傷效應(yīng)的綜合作用。(6)隨著微波場作用時間的增加,可以將煤樣的瓦斯吸附特性的變化過程分為三個階段。
[Abstract]:Pre-drainage of coal seam gas is one of the effective methods to prevent and cure mine gas disaster. However, the gas permeability of most coal seams in China is low and the content of adsorbed gas is high, which makes the coal seam gas extraction rate generally lower. Therefore, in order to improve the coal seam gas extraction rate, it is necessary to solve the problem of how to increase the permeability of coal seam, promote the adsorption gas desorption in the medium of coal body, and accelerate the diffusion of free gas. According to the influence of electromagnetic field on coal seam gas adsorption and desorption, a new idea of reducing coal seam gas adsorption by microwave field and promoting coal seam gas desorption is put forward. In this paper, the influence of microwave field on the adsorption and desorption characteristics of coal seam gas is analyzed theoretically, and the effect of microwave field on the pore structure and adsorption desorption characteristics of coal is studied experimentally. The changes of pore structure and adsorption and desorption characteristics of coal under different microwave fields are obtained, and the mechanism of the influence of microwave field on the pore structure and adsorption desorption characteristics of coal is analyzed. The following conclusions are obtained: (1) the microwave field can reduce the specific surface area and pore volume of coal samples.) the Langmuir constant a of coal samples decreases with the increase of microwave field time, and the change of the Langmuir constant a is not obvious with the increase of microwave field time. In general, it decreases first, then increases slightly, then decreases gradually, while the adsorption constant b changes in the opposite direction. However, the change trend of methane adsorption curve of coal samples under microwave field is basically the same as that of the curvature of adsorption isotherm curve, and the adsorption ability of coal to methane is changed by microwave field. The methane adsorption capacity of coal sample is smaller than that of coal sample without microwave field. The methane emission rate of the coal sample increases slightly or keeps the same level when the methane adsorption capacity decreases. The results show that the methane emission ability of coal samples after microwave field is increased. 5) the mechanism of the effect of microwave field on the pore structure and gas adsorption and desorption characteristics of coal is as follows: the effect of microwave field on the thermal effect of electromagnetic radiation on coal body and its mechanism of gas adsorption and desorption. With the increase of the time of microwave field action, The change of gas adsorption characteristics of coal samples can be divided into three stages.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD712.7

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本文編號：1962126