烟煤及其逸出气中挥发性有机化合物研究
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摘要
采用热重-红外-气质(TG-FTIR-GC/MS)三联机,对神华烟煤及其逸出气体进行同步分析,进而对煤大分子结构,逸出气中挥发性有机化合物的组成等方面提供研究基础。采用串联的傅里叶红外光谱仪、色谱质谱联用仪对不同气氛下的热重逸出气分别进行分析,研究挥发性有机化合物的种类、相对含量及变化趋势。研究结果表明氧气参与烟煤受热挥发性有机化合物释放过程中,酚类物质最先消耗,其次是烯烃类物质,烷烃类和芳香烃类物质相对消耗较慢。即使在氧气气氛下,仍会有少量挥发性有机化合物逃逸。其变化规律可以对燃煤电厂实际烟气中挥发性有机物的排放及控制提供基础。
This paper adopted Thermogravimetric-Fourier Transform Infrared Spectroscopy-Gas Chromatography/Mass Spectrometry( TGA-FTIR-GC/MS) to synchronously analyze Shenhua bituminous coal and its evolved gas. The analysis provided basis for the research of coal macromolecular structure and the composition of volatile organic compounds in the evolved gas. The evolved gas under different atmospheres was analyzed through the combination of FTIR and GC/MS. This paper also studied the composition,relative contents,and changing trends of volatile organic compounds evolved from coal pyrolysis. The results showed that in the release of volatile organic compounds evolved from bituminous coal pyrolysis reacted with oxygen,phenolic substance was consumed first,followed by olefins,alkanes,and aromatics,whose consumption was comparatively slow and less. Even with oxygen,a small amount of volatile organic compounds were released. This results is expected to provide support for the VOCs emissions and control in coal-fired power plant.
This paper adopted Thermogravimetric-Fourier Transform Infrared Spectroscopy-Gas Chromatography/Mass Spectrometry( TGA-FTIR-GC/MS) to synchronously analyze Shenhua bituminous coal and its evolved gas. The analysis provided basis for the research of coal macromolecular structure and the composition of volatile organic compounds in the evolved gas. The evolved gas under different atmospheres was analyzed through the combination of FTIR and GC/MS. This paper also studied the composition,relative contents,and changing trends of volatile organic compounds evolved from coal pyrolysis. The results showed that in the release of volatile organic compounds evolved from bituminous coal pyrolysis reacted with oxygen,phenolic substance was consumed first,followed by olefins,alkanes,and aromatics,whose consumption was comparatively slow and less. Even with oxygen,a small amount of volatile organic compounds were released. This results is expected to provide support for the VOCs emissions and control in coal-fired power plant.
引文
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[16]LIU Y,SHAO M,FU L,et al. Source profiles of volatile organic compounds(VOCs)measured in China:Part I[J]. Atmospheric Environment, 2008, 42(25):6247-6260.
[17]CHENG J,ZHANG Y,WANG T,et al. Emission of volatile organic compounds(VOCs)during coal combustion at different heating rates[J]. Fuel,2018,225:554-562.
[18]CHENG J,ZHANG Y,WANG T,et al. Thermogravimetric-Fourier Transform Infrared Spectroscopy-Gas Chromatography/Mass Spectrometry Study of Volatile Organic Compounds from Coal Pyrolysis[J]. Energy&Fuels,2017,31(7):7042-7051.
[2]魏巍.中国人为源挥发性有机化合物的排放现状及未来趋势[D].北京:清华大学,2009.
[3]Fernández-Martínez G,López-Mahía P,Muniategui-Lorenzo S,et al. Determination of volatile organic compounds in coal,fly ash and slag samples by direct thermal desorption/GC/ms[J]. Analusis, 2000, 28(10):953-959.
[4]KALJUVEE T,KEELMAN M,TRIKKEL A,et al. TG-FTIR/MS analysis of thermal and kinetic characteristics of some coal samples[J]. Journal of Thermal Analysis and Calorimetry,2013,113(3):1063-1071.
[5]芦海云,陈爱国,郜丽娟,等.热重-红外联用研究上湾煤中低温热解行为[J].煤炭转化,2015,38(3):32-35.LU H Y,CHEN A,GAO L J,et al. Study on low-temperature pyrolysis of shangwan coal with TG-FTIR[J].Coal Conversion,2015,38(3):32-35.
[6]陈昭睿.煤热解过程中热解气停留时间对热解产物的影响[D].杭州:浙江大学,2015.
[7]ZHU P,LUO A,ZHANG F,et al. Effects of extractable compounds on the structure and pyrolysis behaviours of two Xinjiang coal[J]. Journal of Analytical and Applied Pyrolysis,2018,133:128-135.
[8]XU J,TANG H,SU S,et al. A study of the relationships between coal structures and combustion characteristics:The insights from micro-Raman spectroscopy based on 32 kinds of Chinese coals[J]. Applied Energy,2018,212:46-56.
[9]CASAL M D,VEGA M F,DIAZ-FAES E,et al. The influence of chemical structure on the kinetics of coal pyrolysis[J]. International Journal of Coal Geology,2018,195:415-422.
[10]张志刚.不同变质程度煤样热解气体产物逸出规律研究[J].煤炭技术,2018,37(7):293-295.ZHANG Z G. Study on evolution characteristics of pyrolysis gas products from different rank coals[J]. Coal Technology,2018,37(7):293-295.
[11]张瑜,谢欣馨,徐宏伟,等.低阶煤在热解领域中的应用[J].煤炭加工与综合利用,2018,6:73-76.ZHANG Y,XIE X X,XU H W,et al. Application of low-rank coal in pyrolysis[J]. Coal Processing&Comprehensive Utilization,2018,6:73-76.
[12]FERNANDEZ-MARTINEZ G,LOPEZ-MAHIA P,Muniategui-Lorenzo S,et al. Distribution of volatile organic compounds during the combustion process in coal-fired power stations[J]. Atmospheric Environment,2001,35(33):5823-5831.
[13]GARCIA J P,BEYNE-Masclet S,MOUVIER G,et al.Emissions of volatile organic compounds by coal-fired power stations[J]. Atmospheric Environment(Part A). General Topics,1992,26(9):1589-1597.
[14]CHAGGER H K,JONES J M,POURKASHANIAN M,et al. Emission of volatile organic compounds from coal combustion[J]. Fuel,1999,78(13):1527-1538.
[15]SHI J,DENG H,BAI Z,et al. Emission and profile characteristic of volatile organic compounds emitted from coke production,iron smelt,heating station and power plant in Liaoning Province,China[J]. Science of The Total Environment,2015,515-516:101-108.
[16]LIU Y,SHAO M,FU L,et al. Source profiles of volatile organic compounds(VOCs)measured in China:Part I[J]. Atmospheric Environment, 2008, 42(25):6247-6260.
[17]CHENG J,ZHANG Y,WANG T,et al. Emission of volatile organic compounds(VOCs)during coal combustion at different heating rates[J]. Fuel,2018,225:554-562.
[18]CHENG J,ZHANG Y,WANG T,et al. Thermogravimetric-Fourier Transform Infrared Spectroscopy-Gas Chromatography/Mass Spectrometry Study of Volatile Organic Compounds from Coal Pyrolysis[J]. Energy&Fuels,2017,31(7):7042-7051.