本文選題：瓦斯解吸全過程　切入點(diǎn)：模擬測(cè)試　出處：《中國礦業(yè)大學(xué)》2017年碩士論文

【摘要】：系統(tǒng)研究瓦斯解吸規(guī)律,以便對(duì)突出危險(xiǎn)性進(jìn)行準(zhǔn)確預(yù)測(cè)及瓦斯災(zāi)害事故的有效預(yù)防與控制具有重要的意義與價(jià)值。瓦斯解吸過程具備初始階段流量大、速度快、變化大,而后期涌出量急劇降低但連綿不斷等特征,由于傳統(tǒng)的測(cè)試技術(shù)的限制,至今無法對(duì)整個(gè)煤樣的解吸過程進(jìn)行全面測(cè)定。目前我們?cè)谘芯亢咚姑簶油咚菇馕?guī)律時(shí),多是將煤樣罐中的氣體壓力降低接近大氣壓后再測(cè)定的解吸瓦斯規(guī)律,初始階段內(nèi)的煤體所釋放瓦斯多被忽略。而在采掘過程中,煤體受破壞并解吸瓦斯時(shí),初始階段迅速大量釋放出來的瓦斯(包括游離和吸附瓦斯)對(duì)突出起到關(guān)鍵作用,決定著煤與瓦斯突出是否發(fā)生以及突出強(qiáng)度的大小,而后緩慢釋放的大量瓦斯對(duì)突出的作用迅速降低,但是目前通過煤樣解吸全過程得到的瓦斯解吸規(guī)律及與突出的定量化關(guān)系研究較少。本文針對(duì)上述研究瓦斯解吸規(guī)律方面存在的缺陷,以初始釋放瓦斯膨脹能測(cè)定裝置為基礎(chǔ),搭建了瓦斯解吸全過程測(cè)試平臺(tái)。實(shí)驗(yàn)室測(cè)試了吸附平衡壓力、變質(zhì)程度、粒度等因素對(duì)全過程瓦斯解吸規(guī)律的影響,得到了不同影響因素條件全過程瓦斯解吸規(guī)律曲線,從理論上對(duì)上述規(guī)律進(jìn)行分析。分別用對(duì)數(shù)函數(shù)以及冪函數(shù)擬合全過程瓦斯解吸量曲線,發(fā)現(xiàn)冪函數(shù)更符合瓦斯解吸特征。分析了突出煤樣瓦斯解吸規(guī)律,研究了突出危險(xiǎn)與非突出危險(xiǎn)煤樣瓦斯全解吸過程的差異性,其差別主要在瓦斯解吸的前期階段解吸量的大小。因此,在選擇突出危險(xiǎn)性預(yù)測(cè)指標(biāo)時(shí),初始釋放瓦斯膨脹能指標(biāo)優(yōu)于鉆屑瓦斯解吸指標(biāo)K1、鉆屑瓦斯解吸指標(biāo)Δh2。此外,擬合了不同時(shí)期煤粒瓦斯解吸量與初始釋放瓦斯膨脹能之間的關(guān)系式,計(jì)算了不同時(shí)期煤粒瓦斯解吸量突出臨界值,這對(duì)于煤與瓦斯突出的判定和預(yù)測(cè)具有重要的意義。
[Abstract]:It is of great significance and value to study systematically the law of gas desorption in order to accurately predict the outburst risk and to prevent and control effectively the gas disaster accident.The process of gas desorption has the characteristics of large initial flow, fast speed and great change, but the quantity of gas emission decreases sharply in the later stage, but it is continuous and so on. Because of the limitation of traditional testing technology, the desorption process of the whole coal sample can not be completely determined.At present, when we study the law of gas desorption from gas-bearing coal samples, most of them are determined after reducing the gas pressure in coal sample tanks close to atmospheric pressure, and most of the gas released by coal bodies in the initial stage are ignored.In the process of mining, when the coal is destroyed and desorbed, the gas released rapidly in the initial stage (including free gas and adsorbed gas) plays a key role in the outburst.Determine whether coal and gas outburst occurs and the magnitude of outburst strength, and then slow release of a large amount of gas on the role of the outburst rapidly reduced,However, there are few studies on the law of gas desorption and the quantitative relationship between gas desorption and outburst through the whole process of coal sample desorption.In view of the defects in the study of the law of gas desorption, a test platform for the whole process of gas desorption was set up based on the measuring device of the initial gas release expansion energy.The influence of adsorption equilibrium pressure, degree of metamorphism and granularity on the law of gas desorption was tested in the laboratory. The curves of the law of gas desorption in the whole process with different influencing factors were obtained, and the above laws were analyzed theoretically.The logarithmic function and power function are used to fit the whole process gas desorption curve, and it is found that the power function is more suitable for the characteristics of gas desorption.The law of gas desorption of outburst coal sample is analyzed and the difference of total desorption process between outburst dangerous coal sample and non-outburst coal sample is studied. The difference mainly lies in the amount of gas desorption in the early stage of gas desorption.Therefore, when selecting the outburst risk prediction index, the initial gas expansion energy index is better than the drill cuttings gas desorption index K1 and the drill debris gas desorption index 螖 H2.In addition, the relationship between coal gas desorption capacity and initial gas expansion energy in different periods is fitted, and the critical value of coal particle gas desorption outburst in different periods is calculated, which is of great significance for the determination and prediction of coal and gas outburst.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD712

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