Abstract
Simulations of pulverized coal boilers and gasifiers have become easier and more complex as computational resources become more available. The improvements in simulations have generally focused on the fluid dynamics and grid resolution, with marginal improvements in treatments of the fundamental coal reactions. In this work, suggestions are made in several areas to improve boiler and gasifier simulations with only relatively small impacts on computational time. New correlations are presented for the elemental composition of coal char and tar as a function of parent coal characteristics, temperature, and heating rate. The importance and correlation of char oxidation effects are discussed. A new generalized model for soot formation, oxidation, and gasification is also discussed.
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References
Ahmed II, Gupta AK (2013) Experiments and stochastic simulations of lignite coal during pyrolysis and gasification. Appl Energy 102:355–363
Al-Abbas AH, Naser J, Hussein EK (2013) Numerical simulation of brown coal combustion in a 550 MW tangentially-fired furnace under different operating conditions. Fuel 107:688–698
Backreedy RI, Habib R, Jones JM, Pourkashanian M, Williams A (1999) An extended coal combustion model. Fuel 78(14):1745–1754
Beck NC, Hayhurst AN (1990) The early stages of the combustion of pulverized coal at high-temperatures. 1. The kinetics of devola-tilization. Combust Flame 79(1):47–74
Bradley D, Lawes M, Park HY, Usta N (2006) Modeling of laminar pulverized coal flames with speciated devolatilization and comparisons with experiments. Combust Flame 144(1–2):190–204
Brewster BS, Baxter LL, Smoot LD (1988) Treatment of coal devolatilization in comprehensive combustion modeling. Energy Fuels 2(4):362–370
Brown AL, Fletcher TH (1998) Modeling soot derived from pulverized coal. Energy Fuels 12(4):745–757
Chen L, Ghoniem AF (2012) Simulation of oxy-coal combustion in a 100 kW(th) test facility using rans and les: a validation study. Energy Fuels 26(8):4783–4798
Chen L, Yong SZ, Ghoniem AF (2012) Oxy-fuel combustion of pulverized coal: characterization, fundamentals, stabilization and CFD modeling. Prog Energy Combust Sci 38(2):156–214
Fletcher TH, Hardesty DR (1992) Compilation of Sandia coal devolatilization data: Milestone report. Sandia National Laboratories, Livermore, CA, May 1992, p 362
Fletcher TH, Kerstein AR, Pugmire RJ, Solum MS, Grant DM (1992) Chemical percolation model for devolatilization. 3. Direct use of C-13 NMR data to predict effects of coal type. Energy Fuels 6(4):414–431
Fletcher TH, Ma J, Rigby JR, Brown AL, Webb BW (1997) Soot in coal combustion systems. Prog Energy Combust Sci 23(3):283–301
Flores DV, Fletcher TH (2000) The use of two mixture fractions to treat coal combustion products in turbulent pulverized-coal flames. Combust Sci Technol 150(1–6):1–26
Freihaut JD, Proscia WM, Seery DJ (1989) Chemical characteristics of tars produced in a novel low-severity, entrained-flow reactor. Energy Fuels 3(6):692–703
Hambly EM, Fletcher TH, Solum M, Pugmire RJ (1998) Solid-state 13-C NMR analysis of coal tar and char. Abstr Pap Am Chem Soc 215:U607–U607
Holland T, Fletcher TH (2016) Global sensitivity analysis for a comprehensive char conversion model in oxy-fuel conditions. Energy Fuels 30(11):9339–9350
Holland T, Bhat S, Marcy P, Gattiker J, Kress JD, Fletcher TH (2017) Modeling effects of annealing on coal char reactivity to O2 and CO2, based on preparation conditions. Energy Fuels 31(10):10727–10744
Hurt R, Sun J-K, Lunden M (1998) A kinetic model of carbon burnout in pulverized coal combustion. Combust Flame 113(1):181–197
Josephson A (2018) Modeling soot formation derived from solid fuels. PhD Dissertation, Chemical Engineering Department, Brigham Young University, Provo, UT
Josephson AJ, Gaffin ND, Smith ST, Fletcher TH, Lignell DO (2017) Modeling soot oxidation and gasification with Bayesian statistics. Energy Fuels 31(10):11291–11303
Josephson AJ, Linn RR, Lignell DO (2018) Modeling soot formation from solid complex fuels. Combust Flame 196:265–283
Lewis AD, Fletcher TH (2013) Prediction of sawdust pyrolysis yields from a flat-flame burner using the CPD model. Energy Fuels 27(2):942–953
Ma J, Fletcher TH, Webb BW (1996) Conversion of coal tar to soot during coal pyrolysis in a post-flame environment. Symp (Int) Combust 26(2):3161–3167
Musarra SP, Fletcher TH, Niksa S, Dwyer HA (1986) Heat and mass transfer in the vicinity of a devolatilizing coal particle. Combust Sci Technol 45(5–6):289–307
Parkash S (1985) True density and elemental composition of subbituminous coals. Fuel 64(5):631–634
Perry ST, Hambly EM, Fletcher TH, Solum MS, Pugmire RJ (2000) Solid-state C-13 NMR characterization of matched tars and chars from rapid coal devolatilization. Proc Combust Inst 28:2313–2319
Pugmire RJ, Solum MS, Grant DM, Critchfield S, Fletcher TH (1991) Structural evolution of matched tar-char pairs in rapid pyrolysis experiments. Fuel 70(3):414–423
Richards A (2019) Coal pyrolysis models for use in massively parallel oxyfuel-fired boiler simulations. PhD Dissertation, Chemical Engineering Department, Brigham Young University, Provo, UT, in preparation
Richards AP, Johnson C, Fletcher TH (2019b) Correlations of the elemental compositions of primary coal tar and char. Energy Fuels 33(10):9520–9537
Smith PJ, Thomas HF, Smoot LD (1981) Model for pulverized coal-fired reactors. Symp (Int) Combust 18(1):1285–1293
Smith KL, Smoot LD, Fletcher TH, Pugmire RJ (1994) The structure and reaction processes of coal. Plenum Press, New York, p 471
Smoot LD, Smith PJ (1985) Coal combustion and gasification. Plenum Press, New York
Smoot LD, Horton MD, Williams GA (1977) Propagation of laminar pulverized coal-air flames. Symp (Int) Combust 16(1):375–387
Smoot LD, Hedman PO, Smith PJ (1984) Pulverized-coal combustion research at Brigham Young University. Prog Energy Combust Sci 10(4):359–441
Tyler RJ (1980) Flash pyrolysis of coals. Devolatilization of bituminous coals in a small fluidized-bed reactor. Fuel 59(4):218–226
Watt M, Fletcher TH, Bai S, Solum MS, Pugmire RJ (1996) Chemical structure of coal tar during devolatilization. Symp (Int) Combust 26(2):3153–3160
Zhou M-M, Parra-Álvarez JC, Smith PJ, Isaac BJ, Thornock JN, Wang Y, Smith ST (2019) Large-eddy simulation of ash deposition in a large-scale laboratory furnace. Proc Combust Inst 37(4):4409–4418
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This material is partially based upon work supported by the Department of Energy, National Nuclear Security Administration, under Award Number DE-NA0002375.
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Fletcher, T.H., Lignell, D.O., Josephson, A., Richards, A., Holland, T. (2022). Advances in Modeling Coal Pyrolysis, Char Combustion, and Soot Formation from Coal and Biomass Tar. In: Lyu, J., Li, S. (eds) Clean Coal and Sustainable Energy. ISCC 2019. Environmental Science and Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-16-1657-0_3
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