Weitere Kapitel dieses Buchs durch Wischen aufrufen
To study the catalytic effects of alkali, alkaline earth and transition metal additives on coal pyrolysis behavior, bituminous coal loaded NaCl, KCl, CaCl2, MgCl2, FeCl3and NiCl2was respectively investigated using Thermogravimetry and Fourier Transform Infrared Spectroscopy (TG-FTIR). Results indicated that the maximum mass loss rate decreased under the metal additives in the primary pyrolysis stage. The total mass loss of pyrolysis was reduced in metals catalyzed pyrolysis except for Na loaded sample. Kinetic analysis was taken for all samples adopting the method of Coats-Redfern. Activation energy of raw coal in the primary pyrolysis stage was 92.15vkJ·mol−1, which was lowered to 44.59–73.42 kJ·mol−1under metal additives. The orders of catalytic effect for this bituminous coal were Mg > Fe > Ca > Ni > K > Na according to their activation energies. Several investigated volatiles including CH4, CO2, CO, toluene, phenol and formic acid were identified from FTIR spectra. The yields of CH4, CO2, toluene, phenol and formic acid were decreased, but the evolution of CO was increased. The presence of metals in the coal samples have been involved in a repeated bond-forming and bond-breaking process, which greatly hindered the release of tars during pyrolysis as the tar precursors were connected to coal/char matrix and were thermally cracked, becoming a part of char.
Bitte loggen Sie sich ein, um Zugang zu diesem Inhalt zu erhalten
Sie möchten Zugang zu diesem Inhalt erhalten? Dann informieren Sie sich jetzt über unsere Produkte:
National Bureau of Statistic of China. China statistical yearbook of 2010. Beijing: China Statistics Press; 2011.
Fang MX, Cen JM, Wang QH, et al. 25 MW circulating fluidized bed heat-power-coal Gas poly-generation installation. J Power Eng. 2007;27(4):635–9.
Fang MX, Cen JM, Wang QH, et al. Study on coal combustion and pyrolysis Gas Tar and steam polygeneration system. Wuhan: Huazhong University Science & Technology Press; 2007. p. 623–7.
Li C. Some recent advances in the understanding of the pyrolysis and gasification behaviour of Victorian brown coal. Fuel. 2007;86(12–13):1664–83. CrossRef
Z.Y. Luo, M.X. Fang, Q.H. Wang, et al: Circulating Fluidized Bed Heat-Power-Coal Gas Poly-Generation Installation and Methods. China Patent. 200610154581, 2007/06/13.
Arenillas A, Rubiera F, Pis JJ. Simultaneous thermogravimetric-mass spectrometric study on the pyrolysis behaviour of different rank coals. J Anal Appl Pyrolysis. 1999;50(1):31–46. CrossRef
Christiansen JV, Feldthus A, Carlsen L. Flash pyrolysis of coals: temperature-dependent product distribution. J Anal Appl Pyrolysis. 1995;32:51–63. CrossRef
Pan WP, Richards GN. Influence of metal-ions on volatile products of pyrolysis of wood. J Anal Appl Pyrolysis. 1989;16(2):117–26. CrossRef
Shimada N, Kawamoto H. Different action of alkali/alkaline earth metal chlorides on cellulose pyrolysis. J Anal Appl Pyrolysis. 2008;81(1):80–7. CrossRef
Yang J, Cai N. A TG-FTIR study on catalytic pyrolysis of coal. J Fuel Chem Technol. 2006;34(6):650–4. CrossRef
Tsubouchi N, Chunbao Xu, Ohtsuka Y. Effect of alkaline earth metals on N 2formation during fixed Bed pyrolysis of a low rank coal. Fuel Process Technol. 2004;85:1039–52. CrossRef
Zhiheng Wu, Sugimoto Y, Kawashima H. Effect of demineralization and catalyst addition on N 2formation during coal pyrolysis and on char gasification. Fuel. 2003;82:2057–64. CrossRef
Wang W, Lan YX, Li M. Pyrolysis of pine sawdust by TG-FTIR analysis. J Agro-Environ Sci. 2008;01:380–4.
Peng YY, Wu SB. Characteristics and kinetics of sugarcana bagasse hemicellulose pyrolysis by TG-FTIR. Chem Indust Eng Prog. 2009;08:1478–84.
Wang SR, Liu Q, Luo ZY, et al. Mechanism study of cellulose pyrolysis using thermogravimetric analysis coupled with infrared spectroscopy. J Zhejiang Univ (Eng Sci). 2006;40(7):1154–8.
Zhu HM, Jiang XG, Chi Y, et al. Study on kinetic characteristic of medical waste by using TG-FTIR analysis. J Eng Thermophys. 2008;29(3):519–22.
Zhou JH, Ping CJ, Yang WJ, et al. Experimental study on the pyrolysis characteristic of coal blends using TGA-FTIR. J Fuel Chem Technol. 2004;32(6):658–62.
Nowakowski DJ, Jones JM, Brydson RMD, Ross AB. Potassium catalysis in the pyrolysis behaviour of short rotation willow coppice. Fuel. 2007;86(15):2389–402. CrossRef
Chermin HAG, Vankrevelen DW. Chemical structure and properties of coal. 17. A mathematical model of coal pyrolysis. Fuel. 1957;36(1):85–104.
Yang JB, Cai NS. A TG-FTIR study on catalytic pyrolysis of coal. J Fuel Chem Technol. 2006;34(6):650–4. CrossRef
Xiong FX, Wu SH, Lin WG. Study on Hegang bituminous coal pyrolysis by TG-FTIR. Power Syst Eng. 2006;22(5):26–8.
Coats AW, Redfern JP. Kinetic parameters from thermogravimetric data. Nature. 1964;201:68–9. CrossRef
Jie X, Zhijie Zhou, Shenqi Xu, Guangsuo Yu. Effect of alkali metal on rate of coal pyrolysis and gasification. CIESC J. 2011;62(1):192–8.
Liu QR, Hu HQ, Zhou Q, Zhu SW, Chen GH. Effect of inorganic matter on reactivity and kinetics of coal pyrolysis. Fuel. 2004;83(6):713–8. CrossRef
Han L, Wang QH, Ma QA, Yu CJ, Luo ZY, Cen KF. Influence of CaO additives on wheat-straw pyrolysis as determined by TG-FTIR analysis. J Anal Appl Pyrolysis. 2010;88(2):199–206. CrossRef
Shifu WEN. Fourier transform infrared spectrometry. Beijing: Press of Chemistry Industry; 2010.
Schafer HNS. The science of Victorian brown coal. Oxford: Butterworth-Heinemann; 1991. chap. 7.
Jess A. Mechanisms and kinetics of thermal reactions of aromatic hydrocarbons from pyrolysis of solid fuels. Fuel. 1996;75(12):1441–8. CrossRef
Jia YB, Huang JJ, Wang Y. Effects of calcium oxide on the cracking of coal tar in the freeboard of a fluidized bed. Energy Fuel. 2004;18(6):1625–32. CrossRef
Li C-Z, Sathe C, Kershaw JR, Pan Y. Fates and roles of alkali and alkaline earth metals during the pyrolysis of a Victorian brown coal. Fuel. 2000;79:427–38. CrossRef
Liu Q, Wang SR, Zheng Y, Luo ZY, Cen KF. Mechanism study of wood lignin pyrolysis by using TG-FTIR analysis. J Anal Appl Pyrolysis. 2008;82(1):170–7. CrossRef
Evans RJ, Milne TA. Molecular characterization of the pyrolysis of biomass: 1. Fundamentals. Energy Fuel. 1987;1(2):123–37. CrossRef
- Influence of Metal Additives on Pyrolysis Behavior of Bituminous Coal by TG-FTIR Analysis
- Springer Berlin Heidelberg