本文選題：無(wú)煙煤 + 塊度　； 參考：《太原理工大學(xué)》2013年碩士論文

【摘要】：我國(guó)在煤層氣開(kāi)采領(lǐng)域還處于起步階段,各項(xiàng)技術(shù)還不夠成熟,尤其是我國(guó)煤田地質(zhì)特殊的“三低一高”特征所引起煤層低解吸、低滲透等問(wèn)題,一直是制約煤層氣開(kāi)采的重點(diǎn)問(wèn)題。因此,提高瓦斯在煤層中的解吸率和滲透率,改進(jìn)抽采技術(shù),成為我國(guó)煤層氣開(kāi)采的關(guān)鍵環(huán)節(jié)。本文首先詳細(xì)地分析了國(guó)內(nèi)外對(duì)煤瓦斯解吸特性和電化學(xué)對(duì)煤作用的研究現(xiàn)狀,提出了一種非力學(xué)作用煤體提高煤層瓦斯解吸的方法,即電化學(xué)強(qiáng)化煤層瓦斯解吸的基本研究思想和理論,并進(jìn)行了以下主要的研究工作： 1、在自主研制塊煤瓦斯吸附解吸裝置上對(duì)0.8mm～1mm、8mm～10mm、20mm～25mm、40mm～45mm、70mm～75mm和135mm～140mm六種塊度的無(wú)煙煤進(jìn)行了不同瓦斯吸附平衡壓力下的等溫氣體解吸試驗(yàn)。 2、在自主研制的塊煤電化學(xué)作用裝置上對(duì)上述六種塊度的無(wú)煙煤進(jìn)行了電化學(xué)改性試驗(yàn)。 3、通過(guò)對(duì)六種塊度自然無(wú)煙煤瓦斯的解吸數(shù)據(jù)分析,得出隨著無(wú)煙煤的塊度增大,解吸速率及解吸率逐漸減小、解吸平衡時(shí)間逐漸延長(zhǎng)；隨著瓦斯吸附壓力的增加,煤瓦斯解吸的能力逐漸增強(qiáng),但解吸的增加率逐漸減小。 4、通過(guò)對(duì)六種塊度電化學(xué)改性無(wú)煙煤瓦斯的解吸數(shù)據(jù)分析,得出電化學(xué)作用后塊度為0.8mm～1mm的無(wú)煙煤解吸速率大于其他五類(lèi)塊度煤樣解吸速率,而隨塊度的增大煤樣解吸速率逐漸降低但差別不明顯；電化學(xué)作用后無(wú)煙煤瓦斯解吸特性仍與瓦斯吸附壓力有關(guān)：隨著瓦斯吸附壓力的增加,煤瓦斯解吸的能力逐漸增強(qiáng),但瓦斯吸附壓力為2MPa和3MPa下,解吸效果變化不明顯。 5、通過(guò)對(duì)六種塊度電化學(xué)改性前后無(wú)煙煤瓦斯的解吸數(shù)據(jù)分析,得出塊度為0.8mm～1mm的無(wú)煙煤經(jīng)電化學(xué)作用后解吸速率變化不明顯,而其他塊度煤樣電化學(xué)作用后解吸速率均有所提高并且塊度越大解吸速率增加越明顯；塊度為0.8mm～1mm的無(wú)煙煤經(jīng)電化學(xué)作用后解吸率明顯降低,其余五種塊度無(wú)煙煤樣經(jīng)電化學(xué)作用后解吸率均有所提高。 6、通過(guò)對(duì)0.8mm～1mm和8mm～10mm兩種塊度自然無(wú)煙煤的壓汞數(shù)據(jù)分析,得出塊度為8mm～10mm煤樣的中孔及大孔所占比例比0.8mm～1mm塊度煤樣的明顯增多,說(shuō)明大塊度的煤樣中微孔及小孔所占比例下降；0.8mm～1mm和8mm～10mm兩種塊度無(wú)煙煤樣的比表面積分別為1.330m2/g和6.415m2/g,說(shuō)明大塊度煤樣的比表面積大大增加。分析認(rèn)為：無(wú)煙煤瓦斯解吸速率可能由煤樣中中孔及大孔的數(shù)量決定；而無(wú)煙煤的比表面積則決定了其瓦斯解吸率的大小。 7、通過(guò)對(duì)原無(wú)煙煤樣、0.8mm～1mm塊度改性無(wú)煙煤樣和8mm～10mm塊度改性無(wú)煙煤樣的FTIR圖譜分析,得出電化學(xué)處理后無(wú)煙煤的醇、酚、醚、酯等含氧官能團(tuán)的迅速減少是導(dǎo)致電化學(xué)作用后無(wú)煙煤瓦斯解吸率提高的直接原因；而0.8mm～1mm和8mm～10mm兩種塊度改性煤樣的圖譜曲線(xiàn)差別不明顯,說(shuō)明隨著改性煤樣塊度的增大,電化學(xué)對(duì)無(wú)煙煤影響作用減小,宏觀上表現(xiàn)為隨著塊度的增加,瓦斯解吸率逐漸降低,但降低幅度逐漸減小。
[Abstract]:China is still in the initial stage in the field of coal seam gas mining, and the technology is not mature enough. Especially, the special "three low and one high" characteristics of coal geology in our country causes low desorption and low permeability of coal seam, which has always been the key problem to restrict the mining of coal bed gas. Therefore, it is necessary to improve the desorption rate and permeability of gas in the coal seam and improve the extraction of coal seam. Technology has become the key link of coal seam gas mining in China. Firstly, this paper analyzes the research status of coal gas desorption characteristics and the effect of electrochemistry on coal at home and abroad, and puts forward a method of improving coal seam gas desorption by non mechanical coal body, that is the basic research thought and theory of electrochemical enhancement of coal seam gas desorption. The following main research work:
1, the isothermal gas desorption test was carried out on six blocks of 0.8mm ~ 1mm, 8mm to 10mm, 20mm to 25mm, 40mm to 45mm, 70mm to 75mm and 135mm to 140mm, on the self developed coal gas adsorption and desorption device.
2, electrochemical modification experiments of six kinds of anthracite were carried out on the independently developed block electrochemistry device.
3, through the analysis of the desorption data of six kinds of natural anthracite coal gas, it is concluded that the desorption rate and desorption rate gradually decrease with the increase of the bulk of the anthracite coal, and the desorption equilibrium time is gradually extended. With the increase of gas adsorption pressure, the ability of coal gas desorption is gradually enhanced, but the increase rate of desorption is gradually reduced.
4, by analyzing the desorption data of six kinds of electrochemical modified anthracite coal gas, it is concluded that the desorption rate of the anthracite with a degree of 0.8mm ~ 1mm after electrochemical action is greater than that of the other five kinds of lump coal sample desorption rate, and the desorption rate of coal sample decreases with the increase of the lump degree, but the difference is not obvious; the gas desorption of anthracite after the electrochemical action is not obvious. The characteristics of gas adsorption pressure are still related to gas adsorption pressure: with the increase of gas adsorption pressure, the ability of coal gas desorption is gradually enhanced, but the adsorption pressure of gas is 2MPa and 3MPa, and the effect of desorption is not obvious.
5, through the analysis of the desorption data of the anthracite gas before and after the six block electrochemical modification, it is concluded that the desorption rate of the anthracite with the bulk of 0.8mm ~ 1mm is not obvious after the electrochemical action, but the desorption rate of the other lump coal samples increases and the greater the bulk density is, the greater the bulk density is 0.8mm ~ 2. The desorption rate of 1mm anthracite decreased obviously after electrochemical treatment, and the desorption rate of the other five kinds of anthracite samples increased after electrochemical treatment.
6, through the analysis of the mercury pressure data of two kinds of natural anthracite from 0.8mm to 1mm and 8mm to 10mm, it is found that the proportion of the middle hole and the large hole in the 8mm to 10mm coal sample is more than the 0.8mm to 1mm lump coal samples, which indicates that the proportion of the micropores and small holes in the large lump coal samples decreases; 0.8mm to 1mm and 8mm to 10mm two kinds of block anthracite samples The specific surface area of the coal sample is 1.330m2/g and 6.415m2/g, respectively, indicating that the specific surface area of the large lump coal is greatly increased. It is believed that the gas desorption rate of anthracite may be determined by the number of mesoporous and large pores in the coal samples, while the specific surface area of anthracite coal determines the large fraction of its gas desorption rate.
7, through the analysis of the FTIR Atlas of the anthracite samples, 0.8mm to 1mm block modified anthracite samples and 8mm to 10mm block modified anthracite samples, the rapid reduction of oxygen containing functional groups such as alcohol, phenol, ether and ester after electrochemical treatment is the direct cause of the increase of the desorption rate of anthracite after electrochemical action; and 0.8mm to 1mm and 8mm. The difference of the atlas curves of two kinds of coal samples modified by 10mm is not obvious. It shows that the effect of electrochemical on anthracite coal decreases with the increase of the size of the modified coal sample, and the gas desorption rate gradually decreases with the increase of the block degree, but the decrease is gradually reduced.

【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TD712

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