Devolatilization and volatiles reaction of individual coal particles in the context of FGM tabulated chemistry

Knappstein, Robert; Kuenne, G.; Ketelheun, Anja; Köser, Jan; Becker, Lukas; Heuer, Sebastian; Schiemann, Martin; Scherer, Viktor; Dreizler, Andreas; Sadiki, A.; Janicka, J.

doi:10.1016/j.combustflame.2016.04.014

Cited by 45 publications

(17 citation statements)

References 49 publications

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“…coal from Colombia which has been investigated previously in different studies [22,[24][25][26][27][28][29]. The present sample was milled, dried and sieved in the particle size 90-106 μm.…”

Section: Fuel Descriptionmentioning

confidence: 99%

Effects of oxy-fuel conditions on the products of pyrolysis in a drop tube reactor

Heuer

Senneca

Wütscher

et al. 2016

Fuel Processing Technology

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Section: Fuel Descriptionmentioning

confidence: 99%

Effects of oxy-fuel conditions on the products of pyrolysis in a drop tube reactor

Heuer

Senneca

Wütscher

et al. 2016

Fuel Processing Technology

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“…Yang brown coal [17] are employed ( Table 1) Coal pyrolysis, including Na/Cl/S release, volatile-gas combustion and Na/Cl/S reactions are 175 simulated. Heterogeneous reaction of char is not considered, because its contribution is weak in a 176 small-scale pulverized-coal flame, as already demonstrated in [32,34,42]. 177…”

Section: Pulverized-coal Flame Configuration and Numerics 156mentioning

confidence: 99%

Numerical study of HCl and SO2 impact on sodium emissions in pulverized-coal flames

Wan

Wang

Xia

et al. 2019

Fuel

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14Sodium emissions during pulverized-coal combustion (PCC) are known to result in severe 15 ash-related operating issues of coal furnaces, e.g., fouling, slagging and corrosion. To relieve these 16 issues and advance the clean utilization technologies of coal, a better understanding of the 17 fundamental mechanisms driving the formation and transformation of the sodium species is required. 18In the present study, sodium emissions have been simulated in both one-dimensional (1D) 19 premixed/diffusion flames of the coal volatile and an early-stage two-dimensional (2D) 20 pulverized-coal flame. The properties of Loy Yang brown coal are used. The DRM22 skeletal 21 mechanism is employed for volatile-gas combustion, and the reaction of sodium species is modeled 22 by a detailed mechanism encompassing the elements Na, C, H, O, S and Cl. The compositions of the 23 volatile fuels are obtained from the chemical percolation devolatilization (CPD) model, including 24 CH4, C2H2, CO, H2, CO2 and H2O. The initial species of Na, Cl and S in the volatile gas is set to be 25NaOH, HCl and SO2, respectively. The transformation characteristics of 12 sodium species are 26 investigated in both the 1D volatile flames and the 2D pulverized-coal flame. The response of the 27 sodium chemistry to volatile-gas combustion is analyzed under fuel-lean, stoichiometric and 28 2 fuel-rich conditions. Na, NaOH and NaCl are found to be the major sodium species during the 29 combustion. Parametric studies with HCl, SO2 or both species removed from the volatile are then 30 performed to investigate their effects on the sodium transformation characteristics in both the 1D and 31 2D flames. The results show that HCl has a much stronger ability to react with sodium species than 32 SO2. 33

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“…These quantities are control variables of the FPV model, and they are directly obtained by the solutions of Eqs. (12) and (13) . In the FTC model, these transport equations are solved with the only purpose of validating the FTC results.…”

Section: A Posteriori Analysismentioning

confidence: 99%

“…The thermo-chemical state of the reacting flow is defined by a limited number of representative control variables, and it is usually pre-computed using canonical reference flamelets. Flamelet-based LES's of PCC burners have been recently carried out [9][10][11][12][13][14] . However, because of the intense mass and heat exchange between the solid and the gas phase during the thermo-chemical conversion of the coal particles, extension of the tabulation methods for coal combustion is not straightforward [15] .…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of a stagnation pulverised coal flame

Vascellari

Messig

Scholtissek

et al. 2019

Proceedings of the Combustion Institute

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A multi-stream Flamelet Progress Variable (FPV) model, specifically developed for coal combustion, is proposed. The model accounts for the different fuel streams associated with the volatile and char burnout products. The applicability of the new FPV model is investigated in a laminar stagnation pulverized coal flame. The flame considered is a premixed mixture of CH 4 , O 2 and N 2 , carrying pulverized coal particles, stabilized in an impinging wall. Spontaneous emissions of OH * , CH * and C * 2 are measured to identify the flame. The 1D numerical simulations of the experimental conditions are able to reproduce the main features of the flame. The applicability of the multi-stream FPV model to coal combustion is further evaluated with the a posteriori analysis of the FPV results, comparing the results with a reference model, where the species are fully transported and the chemistry directly evaluated. Then, with the budget analysis, the influence of the control variables used to build the look-up table is assessed by examining the conditional contributions to the overall transport terms of scalar quantities (e.g. species, temperature). The results of both analyses show that the proposed multi-stream FPV model can accurately predict the main features of coal combustion, with only minor issues related to the manifold used to build the look-up table.

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Devolatilization and volatiles reaction of individual coal particles in the context of FGM tabulated chemistry

Cited by 45 publications

References 49 publications

Effects of oxy-fuel conditions on the products of pyrolysis in a drop tube reactor

Effects of oxy-fuel conditions on the products of pyrolysis in a drop tube reactor

Numerical study of HCl and SO2 impact on sodium emissions in pulverized-coal flames

Experimental and numerical investigation of a stagnation pulverised coal flame

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