本文選題：焦煤 + 產(chǎn)塵�。� 參考：《山東科技大學(xué)》2017年碩士論文

【摘要】：魯西南A礦焦煤在開采過程中易破碎,產(chǎn)塵量大,粒徑小,粉塵防治困難。本文首先對易破碎焦煤的物化特性進行了分析。在此基礎(chǔ)之上,根據(jù)相似原理,制作了易破碎焦煤的相似材料試樣,并利用聲發(fā)射檢測技術(shù)對其破裂產(chǎn)塵特點進行分析,然后進行了易破碎焦煤的重力落錘實驗,測定了易破碎焦煤的產(chǎn)塵粒徑分布規(guī)律,最后對易破碎焦煤粉塵的細觀孔隙結(jié)構(gòu)進行了測定,得出了其孔隙結(jié)構(gòu)特征。根據(jù)本文的研究結(jié)論,可以為易破碎焦煤粉塵的防治工作提供基本指導(dǎo)。主要研究內(nèi)容如下:(1)對煤粉(塵)來源進行分析,研究了易破碎焦煤的物化性質(zhì),結(jié)果表明:受不同構(gòu)造應(yīng)力影響的煤(碎裂煤、碎粒煤、碎粉煤),其宏觀、微觀特性差別較大,同一工作面不同層位煤樣的揮發(fā)分,固定碳等含量差別較大。(2)進行了不同組合形式的易破碎焦煤相似材料試樣單軸壓縮條件下的聲發(fā)射檢測試驗,對其各自的破裂產(chǎn)塵特點進行了研究。實驗結(jié)果表明:對于不同組合形式的相似材料試樣,宏觀裂紋首先出現(xiàn)及碎粒崩出的位置總是位于軟煤相似材料和硬煤相似材料的交界處,軟煤相似材料的破壞程度較高,產(chǎn)塵量大;軸向、側(cè)向力學(xué)加載過程表明,側(cè)向加載,裂隙沿試樣的層理方向擴展,塵源核集中;軸向加載,裂隙向四面八方擴展,塵源核分散。(3)進行了易破碎焦煤的產(chǎn)塵能力及重力落錘實驗,得出易破碎焦煤的原生煤塵產(chǎn)塵量與易破碎焦煤單軸抗壓強度相關(guān)。易破碎焦煤細小顆粒粉塵所占比例與落錘能量有關(guān),研究表明易破碎焦煤塵粒主要集中于“能量產(chǎn)塵粒徑拐點”附近(6.62～105.25 μm)�，F(xiàn)場落塵特征粒度分析規(guī)律表明斷層及采掘截割工藝影響各采樣點的特征粒度符合附近“能量產(chǎn)塵粒徑拐點”的觀點。(4)利用低溫液氮吸附實驗對易破碎焦煤粉塵進行孔隙結(jié)構(gòu)測定,對比了不同易破碎焦煤煤塵的孔隙特征。不同易破碎焦煤煤塵由于地質(zhì)構(gòu)造的不同、灰分含量的不同、碳含量的不同,其孔徑分布不相同,孔的形態(tài)也有較大差別;碎粉煤和鱗片煤煤粉受構(gòu)造應(yīng)力的影響最大,其孔隙結(jié)構(gòu)的復(fù)雜程度最高;碎裂煤及碎粒煤受構(gòu)造應(yīng)力的影響程度較小。分形維數(shù)的數(shù)值與構(gòu)造煤粉塵的微觀孔隙分布的復(fù)雜程度呈正相關(guān)關(guān)系。
[Abstract]:The coking coal of Southwest Shandong A Mine is easy to be broken in the process of mining, the dust production is large, the particle size is small, and the dust prevention is difficult. In this paper, the physical and chemical characteristics of easily broken coking coal are analyzed. On this basis, according to the principle of similarity, the similar material samples of easily broken coking coal are made, and the characteristics of cracking dust production are analyzed by means of acoustic emission detection technology, and then the gravity drop weight test of easily broken coking coal is carried out. The particle size distribution of easily broken coking coal was measured. Finally, the pore structure of coal dust was determined and the pore structure characteristics were obtained. According to the conclusion of this paper, it can provide basic guidance for the prevention and control of easily broken coking coal dust. The main research contents are as follows: (1) the source of pulverized coal (dust) is analyzed, and the physical and chemical properties of easily broken coking coal are studied. The results show that the macroscopic properties of coal (broken coal, granular coal, pulverized coal) affected by different tectonic stresses are macroscopic. The microcosmic characteristics are quite different, and the volatile matter and fixed carbon content of different coal samples in the same working face are different greatly. The acoustic emission testing tests are carried out under the condition of uniaxial compression of the samples of similar materials of easily broken coking coal in different combination forms. The characteristics of their own rupture and dust production are studied. The experimental results show that for the samples of similar materials with different combinations, the positions of the first appearance of macroscopic cracks and the breakout of particles are always located at the junction of the similar materials of soft coal and hard coal, and the failure degree of similar materials of soft coal is higher. The process of axial and lateral mechanical loading shows that the crack propagates along the stratification direction of the specimen, and the dust source core is concentrated, and the axial loading leads to the crack spreading in all directions. The dust-producing ability and gravity drop weight test of easily broken coking coal were carried out. The results showed that the dust-producing amount of primary coal dust was related to uniaxial compressive strength of easily broken coking coal. The proportion of fine particles dust in easily broken coking coal is related to the falling weight energy. The study shows that the dust particles of easily broken coking coal are mainly concentrated near the inflexion point of energy dust size, which is 6.62 渭 m ~ 105.25 渭 m ~ (-1). The characteristic particle size analysis rule of field dust drop shows that the characteristic granularity of each sampling point affected by fault and cutting technology accords with the nearby viewpoint of "energy dust producing particle size inflection point". (4) using low temperature liquid nitrogen adsorption experiment to easily break coke coal dust To determine the pore structure, The pore characteristics of different easily broken coking coal dust are compared. Because of the different geological structure, different ash content, different carbon content, the pore size distribution is different, the pore shape is also different, the pulverized coal and the scale coal powder are most affected by the tectonic stress. The complexity of pore structure is the highest, and that of broken coal and granular coal is less affected by tectonic stress. The fractal dimension is positively correlated with the complexity of micro pore distribution of tectonic coal dust.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD714.4

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