Characteristics of single petcoke particle during the gasification process at high temperatures

doi:10.1016/j.cjche.2019.02.025

Abstract

Abstract: Particle concentration significantly affected the gasification of petcoke particles according to our previous studies. In this work, gasification characteristics and morphological evolution of single petcoke particle were investigated using a high temperature stage microscope experimental setup. The results showed that the reaction temperature significantly affected the reactivity of petcoke in the temperature range of 1200-1300℃. While the promoting effect on gasification reactivity decreased with further increasing the reaction temperature, the SEM analysis demonstrated the pore development during the gasification process, which attributed to the increase of reaction rate with conversion. The Raman analysis, HRTEM and SEM-EDX analysis showed that the heterogeneous graphitization of petcoke and non-uniform distribution of catalytic elements in petcoke attributed to the development of surface pores with limited depth. The gasification mechanism of petcoke particle can be briefly described as the reaction rate mainly contributed from the fast-reaction area. Besides, the pore development in fast-reaction area also enlarged the surface area of petcoke particle.

Key words: Petcoke particle, Reaction kinetics, Pore growth, Reaction mechanism, High temperature gasification

摘要： Particle concentration significantly affected the gasification of petcoke particles according to our previous studies. In this work, gasification characteristics and morphological evolution of single petcoke particle were investigated using a high temperature stage microscope experimental setup. The results showed that the reaction temperature significantly affected the reactivity of petcoke in the temperature range of 1200-1300℃. While the promoting effect on gasification reactivity decreased with further increasing the reaction temperature, the SEM analysis demonstrated the pore development during the gasification process, which attributed to the increase of reaction rate with conversion. The Raman analysis, HRTEM and SEM-EDX analysis showed that the heterogeneous graphitization of petcoke and non-uniform distribution of catalytic elements in petcoke attributed to the development of surface pores with limited depth. The gasification mechanism of petcoke particle can be briefly described as the reaction rate mainly contributed from the fast-reaction area. Besides, the pore development in fast-reaction area also enlarged the surface area of petcoke particle.

关键词: Petcoke particle, Reaction kinetics, Pore growth, Reaction mechanism, High temperature gasification

Ming Liu, Zhongjie Shen, Qinfeng Liang, Jianliang Xu, Haifeng Liu. Characteristics of single petcoke particle during the gasification process at high temperatures[J]. Chinese Journal of Chemical Engineering, 2019, 27(10): 2427-2437.

Ming Liu, Zhongjie Shen, Qinfeng Liang, Jianliang Xu, Haifeng Liu. Characteristics of single petcoke particle during the gasification process at high temperatures[J]. 中国化学工程学报, 2019, 27(10): 2427-2437.

References

[1] X. Zhan, J. Jia, Z. Zhou, F. Wang, Influence of blending methods on the co-gasification reactivity of petroleum coke and lignite, Energ. Convers. Manage. 52(2011) 1810-1814.
[2] Y. Khojasteh Salkuyeh, T.A. Adams, Integrated petroleum coke and natural gas polygeneration process with zero carbon emissions, Energy 91(2015) 479-490.
[3] A.R. Brandt, M.S. Masnadi, J.G. Englander, J. Koomey, D. Gordon, Climate-wise choices in a world of oil abundance, Environ. Res. Lett. 13(2018) 044027.
[4] C. Higman, S. Tam, Advances in coal gasification, hydrogenation, and gas treating for the production of chemicals and fuels, Chem. Rev. 114(2014) 1673-1708.
[5] W. Huo, Z. Zhou, X. Chen, Z. Dai, G. Yu, Study on CO₂ gasification reactivity and physical characteristics of biomass, petroleum coke and coal chars, Bioresour. Technol. 159(2014) 143-149.
[6] G. Wang, J. Zhang, G. Zhang, X. Ning, X. Li, Z. Liu, J. Guo, Experimental and kinetic studies on co-gasification of petroleum coke and biomass char blends, Energy 131(2017) 27-40.
[7] L. Ren, J. Yang, F. Gao, J. Yan, Laboratory study on gasification reactivity of coals and petcokes in CO₂/steam at high temperatures, Energy Fuel (2013) 5054-5068.
[8] X. Zhan, Z. Zhou, F. Wang, Catalytic effect of black liquor on the gasification reactivity of petroleum coke, Appl. Energy 87(2010) 1710-1715.
[9] T. Knorr, M. Kaiser, F. Glenk, B.J.M. Etzold, Shrinking core like fluid solid reactions-A dispersion model accounting for fluid phase volume change and solid phase particle size distributions, Chem. Eng. Sci. 69(2012) 492-502.
[10] R.G. Kim, C.W. Hwang, C.H. Jeon, Kinetics of coal char gasification with CO₂:Impact of internal/external diffusion at high temperature and elevated pressure, Appl. Energy 129(2014) 299-307.
[11] Z. Ma, J. Bai, Z. Bai, L. Kong, Z. Guo, J. Yan, W. Li, Mineral transformation in char and its effect on coal char gasification reactivity at high temperatures, part 2:Char gasification, Energy Fuel 28(2014) 1846-1853.
[12] G. Wang, J. Zhang, X. Hou, J. Shao, W. Geng, Study on CO(2) gasification properties and kinetics of biomass chars and anthracite char, Bioresour. Technol. 177(2015) 66-73.
[13] L. Ding, Y. Gong, Y. Wang, F. Wang, G. Yu, Characterisation of the morphological changes and interactions in char, slag and ash during CO₂ gasification of rice straw and lignite, Appl. Energy 195(2017) 713-724.
[14] M. Troiano, T. Santagata, F. Montagnaro, P. Salatino, R. Solimene, Impact experiments of char and ash particles relevant to entrained-flow coal gasifiers, Fuel 202(2017) 665-674.
[15] K. Wittig, P.A. Nikrityuk, S. Schulze, A. Richter, Three-dimensional modeling of porosity development during the gasification of a char particle, AIChE J. 63(2017) 1638-1647.
[16] L. Ren, R. Wei, Y. Gao, Co-gasification reactivity of petcoke and coal at high temperature, Fuel 190(2017) 245-252.
[17] J. Xiao, F. Li, Q. Zhong, J. Huang, B. Wang, Y. Zhang, Effect of high-temperature pyrolysis on the structure and properties of coal and petroleum coke, J. Anal. Appl. Pyrol. 117(2016) 64-71.
[18] A.D. Lewis, E.G. Fletcher, T.H. Fletcher, CO₂ gasification rates of petroleum coke in a pressurized flat-flame burner entrained-flow reactor, Energy Fuel 28(2014) 4447-4457.
[19] W. Huo, Z. Zhou, F. Wang, G. Yu, Mechanism analysis and experimental verification of pore diffusion on coke and coal char gasification with CO₂, Chem. Eng. J. 244(2014) 227-233.
[20] G.H. Coetzee, R. Sakurovs, H.W.J.P. Neomagus, R.C. Everson, J.P. Mathews, J.R. Bunt, Particle size influence on the pore development of nanopores in coal gasification chars:From micron to millimeter particles, Carbon 112(2017) 37-46.
[21] A. Runstedtler, R. Yandon, M. Duchesne, R. Hughes, P. Boisvert, Conversion of petroleum coke in a high-pressure entrained-flow gasifier:Comparison of computational fluid dynamics model and experiment, Energy Fuel 31(2017) 5561-5570.
[22] M. Malekshahian, J.M. Hill, Kinetic analysis of CO₂ gasification of petroleum coke at high pressures, Energy Fuel 25(2011) 4043-4048.
[23] M.H. Sahraei, R. Yandon, M.A. Duchesne, R.W. Hughes, L.A. Ricardez-Sandoval, Parametric analysis using a reactor network model for petroleum coke gasification, Energy Fuel 29(2015) 7681-7688.
[24] M.A. Duchesne, S. Champagne, R.W. Hughes, Dry petroleum coke gasification in a pilot-scale entrained-flow gasifier and inorganic element partitioning model, Energy Fuel 31(2017) 6658-6669.
[25] J. Kopyscinski, R. Habibi, C.A. Mims, J.M. Hill, K₂CO₃-catalyzed CO₂ gasification of ash-free coal:Kinetic study, Energy Fuel 27(2013) 4875-4883.
[26] T. Popa, M. Fan, M.D. Argyle, R.B. Slimane, D.A. Bell, B.F. Towler, Catalytic gasification of a powder river basin coal, Fuel 103(2013) 161-170.
[27] L. Ding, Z. Zhou, W. Huo, G. Yu, Comparison of steam-gasification characteristics of coal char and petroleum coke char in drop tube furnace, Chin. J Chem Eng 23(2015) 1214-1224.
[28] H. Watanabe, K. Okazaki, Effect of minerals on surface morphologies and competitive reactions during char gasification in mixtures of O₂ and CO₂, P. Combust. Inst. 35(2015) 2363-2371.
[29] L.S. Lobo, S.A.C. Carabineiro, Kinetics and mechanism of catalytic carbon gasification, Fuel 183(2016) 457-469.
[30] Y. Li, H. Yang, J. Hu, X. Wang, H. Chen, Effect of catalysts on the reactivity and structure evolution of char in petroleum coke steam gasification, Fuel 117(2014) 1174-1180.
[31] R.C. Brown, Q. Liu, G. Norton, Catalytic effects observed during the co-gasification of coal and switchgrass, Biomass Bioenergy 18(2000) 499-506.
[32] N. Ellis, M.S. Masnadi, D.G. Roberts, M.A. Kochanek, A.Y. Ilyushechkin, Mineral matter interactions during co-pyrolysis of coal and biomass and their impact on intrinsic char co-gasification reactivity, Chem. Eng. J. 279(2015) 402-408.
[33] R. Habibi, J. Kopyscinski, M.S. Masnadi, J. Lam, J.R. Grace, C.A. Mims, J.M. Hill, Co-gasification of biomass and non-biomass feedstocks:Synergistic and inhibition effects of switchgrass mixed with sub-bituminous coal and fluid coke during CO₂ gasification, Energy Fuel 27(2012) 494-500.
[34] Z. Zhou, Q. Hu, X. Liu, G. Yu, F. Wang, Effect of iron species and calcium hydroxide on high-sulfur petroleum coke CO₂ gasification, Energy Fuel 26(2012) 1489-1495.
[35] M. Malekshahian, J.M. Hill, Potassium catalyzed CO₂ gasification of petroleum coke at elevated pressures, Fuel Process. Technol. 113(2013) 34-40.
[36] K. Jayaraman, I. Gokalp, Gasification characteristics of petcoke and coal blended petcoke using thermogravimetry and mass spectrometry analysis, Appl. Therm. Eng. 80(2015) 10-19.
[37] V. Nemanova, A. Abedini, T. Liliedahl, K. Engvall, Co-gasification of petroleum coke and biomass, Fuel 117(2014) 870-875.
[38] M.S. Masnadi, R. Habibi, J. Kopyscinski, J.M. Hill, X. Bi, C.J. Lim, et al., Fuel characterization and co-pyrolysis kinetics of biomass and fossil fuels, Fuel 117(2014) 1204-1214.
[39] A. Gomez, N. Mahinpey, Kinetic study of coal steam and CO₂ gasification:A new method to reduce interparticle diffusion, Fuel 148(2015) 160-167.
[40] M. Liu, Z. Shen, J. Xu, Q. Liang, H. Liu, Experimental studies on CO₂ gasification of petcoke particle swarm at high temperatures, AIChE J. 64(2018) 4009-4018.
[41] B. Srinivas, N.R. Amundson, A single-particle char gasification model, AIChE J. 26(1980) 487-496.
[42] F. Küster, P. Nikrityuk, M. Junghanns, S. Nolte, A. Tünnermann, R. Ackermann, B. Meyer, In-situ investigation of single particle gasification in a defined gas flow applying TGA with optical measurements, Fuel 194(2017) 544-556.
[43] Z. Shen, Q. Liang, J. Xu, B. Zhang, D. Han, H. Liu, In situ experimental study on the combustion characteristics of captured chars on the molten slag surface, Combust. Flame 166(2016) 333-342.
[44] Z. Shen, Q. Liang, J. Xu, B. Zhang, H. Liu, In-situ experimental study of CO₂ gasification of char particles on molten slag surface, Fuel 160(2015) 560-567.
[45] Z. Shen, J. Xu, H. Liu, Q. Liang, Modeling study for the effect of particle size on char gasification with CO₂, AIChE J. 63(2017) 716-724.
[46] C.A. Schneider, W.S. Rasband, K.W. Eliceiri, NIH image to ImageJ:25 years of image analysis, Nat. Methods 9(2012) 671-675.
[47] Y. Wang, S. Zhu, M. Gao, Z. Yang, L. Yan, Y. Bai, F. Li, A study of char gasification in H₂O and CO₂ mixtures:Role of inherent minerals in the coal, Fuel Process. Technol. 141(2016) 9-15.
[48] M. Malekshahian, J.M. Hill, Effect of pyrolysis and CO₂ gasification pressure on the surface area and pore size distribution of petroleum coke, Energy Fuel 25(2011) 5250-5256.
[49] A. Sadezkya1, H. Muckenhuberb, H. Grotheb, R. Niessnera, U. Pöschla, Raman microspectroscopy of soot and related carbonaceous materials:Spectral analysis and structural information, Carbon (2005) 1731-1742.
[50] C. Sheng, Char structure characterised by Raman spectroscopy and its correlations with combustion reactivity, Fuel (2007) 2316-2324.
[51] M. Liu, Z. Shen, Q. Liang, J. Xu, H. Liu, Morphological evolution of a single char particle with a low ash fusion temperature during the whole gasification process, Energy Fuel 32(2018) 1550-1557.
[52] B. Feng, S.K. Bhatia, Variation of the pore structure of coal chars during gasification, Carbon 41(2003) 507-523.