內(nèi)蒙古褐煤熱解特性及半焦燃燒特性試驗研究
發(fā)布時間：2018-05-05 02:41
本文選題：內(nèi)蒙褐煤 + 低溫?zé)峤?/strong>��； 參考：《內(nèi)蒙古工業(yè)大學(xué)》2015年碩士論文
【摘要】：隨著經(jīng)濟(jì)發(fā)展和社會進(jìn)步,能源消費結(jié)構(gòu)不合理的問題在我國可持續(xù)發(fā)展的路上越來越凸顯。面對日益增加的能源與環(huán)境壓力,我國能源結(jié)構(gòu)改革勢在必行。我國長期以煤炭作為主要能源,以往在對煤炭資源的使用過程中,始終優(yōu)先利用高品質(zhì)煤。但隨著我國經(jīng)濟(jì)的飛速發(fā)展,煤炭需求量不斷增加,高品質(zhì)煤在我國的供應(yīng)日趨緊張。我國的低階煤儲量巨大,大量低階煤難以利用,所以低階煤的利用日益受到重視。實現(xiàn)低階煤的清潔高效利用,對緩解能源供應(yīng)緊張,改革我國能源結(jié)構(gòu)具有重要意義。本文首先對內(nèi)蒙地區(qū)的勝利煤田、霍林河煤礦和白音華煤礦三個產(chǎn)地的褐煤進(jìn)行工業(yè)分析、元素分析,并進(jìn)行初步對比。結(jié)果表明,三種褐煤的內(nèi)水分含量相差不大,都小于20%,其中勝利褐煤水分含量最低;三種褐煤揮發(fā)分含量較大,都在35%左右;三種褐煤含氧量都較高,與其結(jié)合的C、H也相對較高。因此內(nèi)蒙古地區(qū)褐煤有較大的提質(zhì)空間。其次采用熱重法研究不同粒度、不同升溫速率對褐煤熱解特性的影響。結(jié)果表明,褐煤的熱解大致可分為脫水干燥、揮發(fā)分析出及有機(jī)物分解和成焦三個階段。通常粒徑越小、升溫速率越低,熱解越完全,揮發(fā)分析出溫度和最大失重率對應(yīng)溫度也越低。然后采用熱重-傅立葉紅外聯(lián)用方法對褐煤熱解析出產(chǎn)物進(jìn)行分析,總結(jié)其熱解規(guī)律。結(jié)果表明,褐煤的熱解產(chǎn)物較為復(fù)雜,不同褐煤的熱解產(chǎn)物組成基本相同。褐煤熱解的主要不凝結(jié)氣體為SO2,NH3,CO2,CH4,CO。熱解油的主要成分有烯烴、脂肪烴、多環(huán)芳烴、單環(huán)芳烴、醇、酚類化合物、酮、酯、羧酸類、酰胺類、含氧化合物、氮磷化合物、硫化合物、亞硝酸酯化合物、鹵素化合物等。最后將三種褐煤在不同終溫下制成半焦,在對其進(jìn)行基本分析對比后,采用熱重法研究熱解終溫對其燃燒特性的影響。對半焦燃燒的燃燒特征判別指數(shù)的計算結(jié)果表明,隨熱解終溫的升高,半焦的穩(wěn)定性升高。利用Coast-Redfern積分法對三種褐煤及其半焦進(jìn)行燃燒動力學(xué)分析,結(jié)果表明當(dāng)反應(yīng)級數(shù)取1.5時,動力學(xué)擬合相關(guān)系數(shù)R的取值在0.99以上,擬合準(zhǔn)確。隨制備半焦的熱解溫度升高,半焦的活化能越來越大,這與對其工業(yè)分析、元素分析、燃燒特征指數(shù)分析得出的結(jié)論一致。經(jīng)過熱解提質(zhì),褐煤轉(zhuǎn)化為低含水率、高發(fā)熱量的燃料,呈現(xiàn)出由低階煤向高階煤轉(zhuǎn)變的趨勢。
[Abstract]:With the development of economy and society, the problem of unreasonable energy consumption structure is more and more prominent on the way of sustainable development. Facing the increasing pressure of energy and environment, the reform of energy structure is imperative. Coal is the main energy in China for a long time. In the past, high quality coal has always been given priority in the use of coal resources. However, with the rapid development of economy in China, the demand for coal is increasing, and the supply of high quality coal in China is becoming increasingly tight. Because of the huge reserves of low-rank coal in China, a large number of low-rank coal is difficult to use, so the utilization of low-rank coal has been paid more and more attention. The realization of clean and efficient utilization of low rank coal is of great significance to alleviate the shortage of energy supply and to reform the energy structure of our country. In this paper, the lignite from Shengli coalfield, Huolinhe coal mine and Baiyinhua coal mine in Inner Mongolia are analyzed and compared. The results show that the internal moisture content of the three lignite is not different, which is less than 20%, the moisture content of Shengli lignite is the lowest, the volatile content of the three lignite is about 35%, and the oxygen content of the three lignite is high. The Con H associated with it is also relatively high. Therefore, the lignite in Inner Mongolia region has a large room for quality improvement. Secondly, the effect of different particle size and heating rate on pyrolysis characteristics of lignite was studied by thermogravimetry. The results show that the pyrolysis of lignite can be divided into three stages: dehydration and drying, volatilization analysis and decomposition and coking of organic matter. Usually, the smaller the particle size, the lower the heating rate, the more complete the pyrolysis, and the lower the corresponding temperature between the volatilization analysis temperature and the maximum weight loss rate. Then the thermogravimetric Fourier transform infrared (FTIR) method was used to analyze the pyrolysis of lignite. The results show that the pyrolysis products of lignite are more complex and the composition of pyrolysis products of different lignite is basically the same. The main uncondensed gas for pyrolysis of lignite is so _ 2H _ 3H _ 2CO _ 2H _ 4C _ 4. The main components of pyrolytic oil are olefins, aliphatic hydrocarbons, polycyclic aromatic hydrocarbons, monocyclic aromatic hydrocarbons, alcohols, phenolic compounds, ketones, esters, carboxylic acids, amides, oxygen-containing compounds, nitrogen and phosphorus compounds, sulfur compounds, nitrite compounds, Halogen compounds, etc. Finally, three kinds of lignite were made into semi-char at different final temperatures. After the basic analysis and comparison, the effect of final pyrolysis temperature on combustion characteristics was studied by thermogravimetric method. The calculation results of combustion characteristic discriminant index of semi-coke combustion show that the stability of semi-coke increases with the increase of final pyrolysis temperature. The combustion kinetics of three kinds of lignite and its char were analyzed by Coast-Redfern integration method. The results show that the correlation coefficient R of kinetic fitting is more than 0.99 when the reaction order is 1.5, and the fitting is accurate. The activation energy of semi-coke increases with the increase of pyrolysis temperature, which is consistent with the analysis of industrial analysis, elemental analysis and combustion characteristic index. After pyrolysis, lignite is transformed into a fuel with low moisture content and high calorific value, which shows a tendency from low-rank coal to high-order coal.
【學(xué)位授予單位】：內(nèi)蒙古工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD849.2
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