本文選題：含瓦斯煤 + 滲吸效應(yīng)�。� 參考：《河南理工大學(xué)》2016年博士論文

【摘要】：為研究水分單因素影響下含瓦斯煤滲吸效應(yīng)的發(fā)生規(guī)律,在對目前相關(guān)實(shí)驗(yàn)裝置調(diào)研的基礎(chǔ)上,設(shè)計并搭建了一套用于滲吸效應(yīng)研究的實(shí)驗(yàn)測試裝置。該裝置能夠有效排除注水壓力、注入水體積對實(shí)驗(yàn)的影響和干擾,確保煤樣罐內(nèi)瓦斯壓力變化僅由滲吸效應(yīng)促進(jìn)含瓦斯煤解吸影響造成,同時配備高精度壓力傳感器,能夠?qū)崿F(xiàn)對滲吸效應(yīng)過程中煤樣罐內(nèi)的壓力變化進(jìn)行全程監(jiān)控與自動記錄。通過考察型煤和顆粒煤在常壓下的自發(fā)吸水效果,確定了合理的實(shí)驗(yàn)煤樣型式為型煤;通過對型煤吸水不同時間后的吸水高度及含水率分布考察,確定了合理的實(shí)驗(yàn)用型煤高度和煤樣含水率。在此基礎(chǔ)上,針對無煙煤(WYM)、貧瘦煤(PSM)、焦煤(JM)和氣煤(QM)等四種不同變質(zhì)程度煤,分別開展了不同含水率和不同吸附平衡壓力條件下的滲吸效應(yīng)實(shí)驗(yàn)研究,探討了不同變質(zhì)程度煤滲吸效果對含水率和吸附平衡壓力變化的響應(yīng)特性;基于實(shí)驗(yàn)測試數(shù)據(jù),對比分析了不同變質(zhì)程度煤在相同實(shí)驗(yàn)條件下的滲吸效果差異,并對產(chǎn)生差異性的原因進(jìn)行了理論分析。實(shí)驗(yàn)結(jié)果表明,水分自然進(jìn)入含瓦斯煤后,煤樣罐內(nèi)瓦斯壓力不斷升高,說明水分能夠依靠滲吸效應(yīng)置換出處于吸附態(tài)的瓦斯,從而有效促進(jìn)煤層吸附瓦斯解吸。吸附平衡壓力相同時,隨煤樣含水率增長,滲吸瓦斯量和滲吸瓦斯率均逐漸增大,但前期增幅較大,后期增幅逐漸變緩;數(shù)據(jù)擬合結(jié)果表明,二者與煤樣含水率之間均符合Langmuir型函數(shù)關(guān)系,當(dāng)煤樣含水率達(dá)到煤的極限吸水率時,滲吸瓦斯量和滲吸瓦斯率將達(dá)到極限值。煤樣含水率相同時,滲吸瓦斯量隨吸附平衡壓力增長較好的符合Langmuir型函數(shù)關(guān)系,滲吸瓦斯率則隨吸附平衡壓力升高逐漸降低。不同實(shí)驗(yàn)條件下的滲吸瓦斯速度均經(jīng)歷“快速滲吸-緩慢滲吸-終止?jié)B吸”三個發(fā)展階段,且煤樣含水率越高、初始吸附平衡壓力越大,水分進(jìn)入含瓦斯煤初期的滲吸瓦斯速度就越大。相同實(shí)驗(yàn)條件下,不同變質(zhì)程度煤的滲吸效果存在較大差異:滲吸瓦斯量和滲吸瓦斯速度方面,均是WYM最大,QM和PSM居中,JM最小;滲吸瓦斯率方面,則是QM最大,WYM和JM居中,PSM最小。理論分析認(rèn)為,不同變質(zhì)程度煤的潤濕性和孔隙結(jié)構(gòu)特征不同是造成上述差異的根本原因。
[Abstract]:In order to study the occurrence rule of gas-bearing coal permeation effect under the influence of water single factor, a set of experimental test equipment was designed and built on the basis of investigation of relevant experimental devices. The device can effectively eliminate the water injection pressure and the influence and interference of the injected water volume on the experiment, and ensure that the change of gas pressure in the coal sample tank is only caused by the infiltration effect to promote the desorption effect of gas-bearing coal, and the high precision pressure sensor is equipped at the same time. The whole process monitoring and automatic recording of pressure change in coal sample tank can be realized. By investigating the spontaneous water absorption effect of briquette and granular coal under atmospheric pressure, the reasonable experimental coal type is determined as briquette, and the water absorption height and water content distribution of briquette after different time absorption are investigated. The reasonable height of briquette and moisture content of coal sample were determined. On the basis of this, four kinds of coal with different metamorphic degree, such as anthracite (WYM), lean coal (PSM), coking coal (JM) and gas coal (QM), were studied respectively under different moisture content and adsorption equilibrium pressure. The response characteristics of different metamorphic coal permeability to the change of moisture content and adsorption equilibrium pressure are discussed, and the difference of permeability and absorption effect of different metamorphic coal under the same experimental conditions is compared and analyzed based on the experimental data. The reason of the difference is analyzed theoretically. The experimental results show that the gas pressure in the coal tank increases continuously after the moisture naturally enters the gas-bearing coal, which indicates that the moisture can replace the gas in the adsorbed state by the effect of seepage and suction, thus effectively promoting the adsorption gas desorption in the coal seam. When the adsorption equilibrium pressure is the same, with the increase of moisture content of coal sample, the amount of gas absorption and the rate of gas absorption increase gradually, but the increase in the early stage is larger, and the increase in the latter stage is gradually slow. The data fitting results show that, The relationship between them and the moisture content of coal samples accords with the Langmuir function. When the water content of coal sample reaches the limit of water absorption rate of coal, the amount of gas permeation and the rate of gas absorption will reach the limit value. When the moisture content of coal sample is the same, the amount of gas permeating and absorbing gas with the increase of adsorption equilibrium pressure accords with the Langmuir function better, and the gas permeation rate decreases gradually with the increase of adsorption equilibrium pressure. Under different experimental conditions, the velocity of gas permeation and suction all go through three stages of development: rapid infiltration, slow permeation and stop infiltration. The higher the moisture content of coal sample is, the greater the initial adsorption equilibrium pressure is. The higher the gas absorption rate of water entering the gas-bearing coal at the initial stage. Under the same experimental conditions, there are great differences in the permeation effect of coal with different metamorphic degrees: in terms of gas permeation and gas absorption velocity, the WYM maximum QM and PSM are the lowest in the middle of JM, and the gas absorption rate is the lowest. The maximum QM WYM and JM are the smallest in PSM. The theoretical analysis shows that the difference of wettability and pore structure of coal with different metamorphic degree is the root cause of these differences.
【學(xué)位授予單位】：河南理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：TD712

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