發(fā)布時(shí)間：2018-08-14 09:16

【摘要】：目前，煤的自燃性與硫含量相關(guān)已被眾多學(xué)者公認(rèn)，其中，硫?qū)γ鹤匀夹缘挠绊懼饕且渣S鐵礦形式存在的無機(jī)硫的影響。研究黃鐵礦硫?qū)γ鹤匀继匦詤?shù)的影響具有重要的現(xiàn)實(shí)意義。 本文以煤自然發(fā)火機(jī)理分析為出發(fā)點(diǎn)，，結(jié)合煤中硫的賦存特點(diǎn)及黃鐵礦自燃機(jī)理，對(duì)比分析多組煤自燃特性相關(guān)實(shí)驗(yàn)數(shù)據(jù)，從氧化性和放熱性兩個(gè)角度分析黃鐵礦硫?qū)γ鹤匀继匦詤?shù)的影響規(guī)律。通過真密度測(cè)試實(shí)驗(yàn)、空隙率測(cè)試實(shí)驗(yàn)、程序升溫實(shí)驗(yàn)、色譜吸氧實(shí)驗(yàn)及DSC熱分析實(shí)驗(yàn)，得出黃鐵礦硫含量與實(shí)驗(yàn)煤樣的導(dǎo)熱系數(shù)、比熱容成正比；分析煤樣耗氧速率、吸氧量、放熱強(qiáng)度及放熱量的變化特征，得出黃鐵礦硫含量為5%~7%煤樣的氧化放熱性最大，煤自燃傾向性最大；不同黃鐵礦硫含量煤樣氧化過程中指標(biāo)氣體數(shù)據(jù)存在差異，其中，黃鐵礦硫含量為5%煤樣的CO濃度最大，且黃鐵礦硫含量越大，CO2/CO值越大。從黃鐵礦的自熱特性和氧化反應(yīng)產(chǎn)物兩個(gè)方面分析了黃鐵礦硫?qū)γ鹤匀嫉挠绊憴C(jī)理，分析了Fe(OH)3溶膠對(duì)煤氧復(fù)合的抑制作用和黃鐵礦硫自熱特性對(duì)煤自燃進(jìn)程的促進(jìn)作用，黃鐵礦硫?qū)γ貉鯊?fù)合及其反應(yīng)放熱影響具有雙重性。 本文分析了低溫氧化階段黃鐵礦硫?qū)γ鹤匀继匦詤?shù)的影響規(guī)律，對(duì)高硫煤層開采過程中的防滅火工作有著重要的指導(dǎo)意義。
[Abstract]:At present, the correlation between the spontaneous combustion of coal and sulfur content has been recognized by many scholars, among which, the influence of sulfur on the spontaneous combustion of coal is mainly the influence of inorganic sulfur in the form of pyrite. It is of great practical significance to study the influence of pyrite sulfur on coal spontaneous combustion characteristic parameters. Based on the analysis of coal spontaneous combustion mechanism, combined with the characteristics of sulfur occurrence in coal and pyrite spontaneous combustion mechanism, this paper contrasts and analyzes several sets of experimental data related to coal spontaneous combustion characteristics. The influence of pyrite sulfur on coal spontaneous combustion parameters is analyzed from two aspects of oxidation and exothermic property. Through real density test, voidage test, programmed temperature test, chromatographic oxygen absorption test and DSC thermal analysis experiment, it is concluded that the sulfur content of pyrite is directly proportional to the thermal conductivity and specific heat capacity of the coal sample, and the oxygen consumption rate of the coal sample is analyzed. The characteristics of oxygen absorption, exothermic intensity and heat release show that the sulfur content of pyrite is 5%, the oxidation exothermic property of coal sample is the largest, the tendency of coal spontaneous combustion is the greatest, and the index gas data of different pyrite sulfur content coal sample are different, among which, The sulfur content of pyrite is 5%, the concentration of CO is the highest, and the higher the sulfur content of pyrite is, the greater the CO _ 2 / CO _ (2) value of pyrite is. The influence mechanism of pyrite sulfur on coal spontaneous combustion was analyzed from the aspects of pyrite autothermal characteristics and oxidation reaction products. The inhibition of Fe (OH) _ 3 sol on coal-oxygen compound and the promoting effect of pyrite sulfur self-heating property on coal spontaneous combustion process were analyzed. Pyrite sulfur has a dual effect on coal-oxygen recombination and reaction exothermic effect. In this paper, the influence of pyrite sulfur on coal spontaneous combustion parameters in low temperature oxidation stage is analyzed, which is of great significance for fire prevention and fire fighting in the mining process of high sulfur coal bed.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TD752.2

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