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Research Papers: Energy Systems Analysis

Effects of Preheating and CO2 Dilution on Oxy-MILD Combustion of Natural Gas

[+] Author and Article Information
Mohamad Hassan Moghadasi

Department of Aerospace Engineering,
Faculty of New Sciences and Technologies,
University of Tehran,
North Kargar Street,
Tehran 1439957131, Iran
e-mail: mh.moghadasi@ut.ac.ir

Rouzbeh Riazi

Department of Aerospace Engineering,
Faculty of New Sciences and Technologies,
University of Tehran,
North Kargar Street,
Tehran 1439957131, Iran
e-mail: ro_riazi@ut.ac.ir

Sadegh Tabejamaat

Department of Aerospace Engineering,
Amirkabir University of Technology,
Hafez Street,
Tehran 158754413, Iran
e-mail: sadegh@aut.ac.ir

Amir Mardani

Department of Aerospace Engineering,
Sharif University of Technology,
Azadi Street,
Tehran 1458889694, Iran
e-mail: amardani@sharif.edu

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the Journal of Energy Resources Technology. Manuscript received March 3, 2019; final manuscript received May 15, 2019; published online June 5, 2019. Assoc. Editor: Esmail M. A. Mokheimer.

J. Energy Resour. Technol 141(12), 122002 (Jun 05, 2019) (12 pages) Paper No: JERT-19-1114; doi: 10.1115/1.4043823 History: Received March 03, 2019; Accepted May 16, 2019

Oxy-moderate or intense low-oxygen dilution (MILD) combustion, which is a novel combination of oxy-fuel technology and MILD regime, is numerically studied in the present work. The effects of external preheating and CO2 dilution level on the combustion field, emission, and CO formation mechanisms are investigated in a recuperative laboratory-scale furnace with a recirculating cross-flow. Reynolds-averaged Navier–Stokes (RANS) equations with eddy dissipation concept (EDC) model are employed to perform a 3-D simulation of the combustion field and the turbulence–chemistry interactions. In addition, a well-stirred reactor (WSR) analysis is conducted to further examine the chemical kinetics of this combination when varying the target parameters. The simulations used the skeletal USC-Mech II, which has been shown to perform well in the oxy-fuel combustion modeling. Results show that with more preheating, the uniformity of temperature distribution is noticeably enhanced at the cost of higher CO emission. Also as inlet temperature increases, the concentration of minor species rises and CO formation through the main path (CH4→CH3→CH2O→HCO→CO→CO2) is strengthened, while heavier hydrocarbons path (C2H2→CO) is suppressed. Meanwhile, greater CO2 addition notably closes the gap between maximum and exhaust temperatures. In a highly CO2-diluted mixture, chain-branching reactions releasing CH2O are strengthened, while chain-terminating reactions are weakened. CH2O production through CH3O is accelerated compared with the straight conversion of methyl to formaldehyde. When diluting the oxidant, methylene CH2(s) plays a more influential role in CO formation than when pure oxygen is used, contributing to higher CO emission.

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References

Chu, S., 2009, “Carbon Capture and Storage,” Science, 325(5948), p. 1599. [CrossRef] [PubMed]
Wall, T., 2007, “Combustion Processes for Carbon Capture,” Proc. Combust. Inst., 31(1), pp. 31–47. [CrossRef]
Buhre, B. J. P., Elliott, L. K., and Sheng, C. D., 2005, “Oxy-Fuel Combustion Technology for Coal-Fired Power Generation,” Prog. Energy Combust. Sci., 31(4), pp. 283–307. [CrossRef]
Pryor, O., Barak, S., Lopez, J., Ninnemann, E., and Koroglu, B., 2017, “High Pressure Shock Tube Ignition Delay Time Measurements During Oxy-Methane Combustion With High Levels of CO2 Dilution,” ASME J. Energy Resour. Technol., 139(4), p. 042208. [CrossRef]
Manikantachari, K. R. V., Vesely, L., Martin, S., Diaz, J., and Vasu, S., 2018, “Reduced Chemical Kinetic Mechanisms for Oxy/Methane Supercritical CO2 Combustor Simulations,” ASME J. Energy Resour. Technol., 140(9), p. 092202. [CrossRef]
Chen, L., and Yong, S. Z., 2012, “Oxy-Fuel Combustion of Pulverized Coal: Characterization, Fundamentals, Stabilization and CFD Modeling,” Prog. Energy Combust. Sci., 38(2), pp. 156–214. [CrossRef]
Normann, F., Andersson, K., Leckner, B., and Johnsson, F., 2009, “Emission Control of Nitrogen Oxides in the Oxy-Fuel Process,” Prog. Energy Combust. Sci., 35(5), pp. 385–397. [CrossRef]
Zarzycki, R., and Panowski, M., 2017, “Analysis of the Flue Gas Preparation Process for the Purposes of Carbon Dioxide Separation Using the Adsorption Methods,” ASME J. Energy Resour. Technol., 140(3), p. 032008. [CrossRef]
Breault, R., and Shadle, L., 2018, “Design, Development, and Operation of an Integrated Fluidized Carbon Capture Unit Using Polyethylenimine Sorbents,” ASME J. Energy Resour. Technol., 140(6), p. 062202. [CrossRef]
Li, P., Mi, J., Dally, B. B., Wang, F., and Wang, L., 2011, “Progress and Recent Trend in MILD Combustion,” Sci. China, 54(2), pp. 255–269. [CrossRef]
Wunning, J. A., and Wunning, J. G., 1997, “Flameless Oxidation to Reduce Thermal NO-Formation,” Prog. Energy Comb. Sci., 23(1), pp. 81–94. [CrossRef]
Cavaliere, A., and Joannon, M. D., 2004, “Mild Combustion,” Progress Energy Combust. Sci., 30(4), pp. 329–366. [CrossRef]
Feser, J., and Gupta, A. K., 2018, “Effect of CO2/N2 Dilution on Premixed Methane–Air Flame Stability Under Strained Conditions,” ASME J. Energy Resour. Technol., 140(7), p. 072207. [CrossRef]
Krishnamurthy, N., Paul, P. J., and Blasiak, W., 2009, “Studies on Low-Intensity Oxy-Fuel Burner,” Proc. Combust. Inst., 32(2), pp. 3139–3146. [CrossRef]
Stadler, H., Christ, D., Habermehl, M., Heil, P., Kellermann, A., Ohliger, A., Toporov, D., and Kneer, R., 2011, “Experimental Investigation of NOx Emissions in Oxycoal Combustion,” Fuel, 90(4), pp. 1604–1611. [CrossRef]
Heil, P., Toporov, D., Forster, D., and Knee, R., 2011, “Experimental Investigation on the Effect of O2 and CO2 on Burning Rates During Oxy-Fuel Combustion of Methane,” Proc. Combust. Inst., 33(2), pp. 3407–3413. [CrossRef]
Liu, R., and An, E., 2017, “Turbulent Flame Characteristics of Oxy-Coal MILD Combustion,” ASME J. Energy Resour. Technol., 139(6), p. 062206. [CrossRef]
Mei, Z., Mi, J., Wang, F., and Zheng, Z., 2012, “Dimensions of CH4-Jet Flame in Hot O2/CO2 Co-Flow,” Energy Fuels, 26(6), pp. 3257–3266. [CrossRef]
Li, P., Dally, B. B., Mi, J., and Wang, F., 2013, “MILD Oxy-Combustion of Gaseous Fuels in a Laboratory-Scale Furnace,” Combustion Flame, 160(5), pp. 933–946. [CrossRef]
Mardani, A., and Fazlollahi, A., 2016, “Numerical Study of Oxy-Fuel MILD (Moderate or Intense Low-Oxygen Dilution Combustion) Combustion for CH4/H2,” Energy, 99(15), pp. 136–151. [CrossRef]
Sabia, P., Sorrentino, G., Chinnici, A., Cavaliere, A., and Ragucci, R., 2015, “Dynamic Behaviors in Methane MILD and Oxy-Fuel Combustion. Chemical Effect of CO2,” Energy Fuels, 29(3), pp. 1978–1986. [CrossRef]
Almansour, B., Thompson, L., Lopez, J., Barari, G., and Vasu, S. S., 2015, “Laser Ignition and Flame Speed Measurements in Oxy-Methane Mixtures Diluted With CO2,” ASME J. Energy Resour. Technol., 138(3), p. 032201. [CrossRef]
Szego, G. G., Dally, B. B., and Nathan, G. J., 2009, “Operational Characteristics of a Parallel Jet MILD Combustion Burner System,” Combust. Flame, 156(2), pp. 429–438. [CrossRef]
Szego, G. G., 2010, “Experimental and Numerical Investigation of a Parallel Jet Mild Combustion Burner System in a Laboratory Scale Furnace,” Ph.D. Thesis, The University of Adelaide, Adelaide, South Australia, Australia.
Pope, S. B., 1997, “Computationally Efficient Implementation of Combustion Chemistry Using In Situ Adaptive Tabulation,” Combust. Theory Modell., 1(1), pp. 41–63. [CrossRef]
Orszag, S., Yakhot, A., Flannery, V., Boysan, W. S., Choudhury, F., Maruzewski, J., and Patel, B., 1993, “Renormalization Group Modeling and Turbulence Simulations,” International Conference, Near-Wall Turbulent Flows, Tempe, AZ, March.
De, A., Oldenhof, E., Sathiah, P., and Roekaerts, D., 2011, “Numerical Simulation of Delft-Jet-in-Hot-Coflow (DJHC) Flames Using the Eddy Dissipation Concept Model for Turbulence–Chemistry Interaction,” Flow Turb. Combust., 87(4), pp. 537–567. [CrossRef]
Gran, I. R., and Magnussen, B. F., 1996, “The Eddy Dissipation Concept,” Combust. Sci. Technol., 119(1–6), pp. 191–217. [CrossRef]
Delphine, L., and Paul, L., 2015, “Assessment of the EDC Combustion Model in MILD Conditions With In-Furnace Experimental Data,” Appl. Therm. Eng., 75(22), pp. 93–102.
Mardani, A., Tabejamaat, S., and Hassanpour, S., 2013, “Numerical Study of CO and CO2 Formation in CH4/H2 Blended Flame Under MILD Condition,” Combust. Flame, 160(9), pp. 1636–1649. [CrossRef]
Li, P., Wang, F., Mi, J., Dally, B.B., and Mei, Z., 2014, “MILD Combustion Under Different Premixing Patterns and Characteristics of the Reaction Regime,” Energy Fuels, 28(3), pp. 2211–2226. [CrossRef]
Hu, F., and Li, P., 2018, “Evaluation, Development, and Validation of a New Reduced Mechanism for Methane Oxy-Fuel Combustion,” Int. J. Green. Gas. Con., 78, pp. 327–340. [CrossRef]
Wang, H., You, X., Joshi, A.V., Davis, S. G., Laskin, A., Egolfopoulos, F., and Law, C., 2007, USC Mech Version II. High-Temperature Combustion Reaction Model of H2/CO/C1-C4 Compounds. http://ignis.usc.edu/Mechanisms/USC-Mech%20II/USC_Mech%20II.htm. Accessed May 2007.
Yu, G., Metghalchi, H., Askari, O., and Wang, Z., 2018, “Combustion Simulation of Propane/Oxygen (With Nitrogen/Argon) Mixtures Using Rate-Controlled Constrained-Equilibrium,” ASME J. Energy Resour. Technol., 141(2), p. 022204. [CrossRef]
Porter, R., Liu, F., Pourkashanian, M., Williams, A., and Smith, D. J., 2010, “Evaluation of Solution Methods for Radiative Heat Transfer in Gaseous Oxy-Fuel Combustion,” Quant. Spectrosc. Rad., 111(14), pp. 2084–2094. [CrossRef]
Gharebaghi, M., Irons, R. M. A., Ma, L., Pourkashaniana, M., and Pranzitelli, A., 2011, “Large Eddy Simulation of Oxy-Coal Combustion in an Industrial Combustion Test Facility,” Int. J. Green. Gas. Con., 5(1), pp. 100–110.
Cumber, P. S., Fairweather, M., and Ledin, H. S., 1998, “Application of Wide Band Radiation Models to Non-Homogeneous Combustion Systems,” Int. J. Heat. Mass. Transfer., 41(11), pp. 1573–1584. [CrossRef]
Bilger, R. W., Stårner, S. H., and Kee, R. J., 1990, “On Reduced Mechanisms for Methane-Air Combustion in Non-Premixed Flames,” Combust. Flame, 80(2), pp. 135–149. [CrossRef]
Wang, F., Li, P., Mei, Z., Zhang, J., and Mi, J., 2014, “Combustion of CH4/O2/N2 in a Well Stirred Reactor,” Energy, 72(1), pp. 242–253. [CrossRef]
Levy, Y., Sherbaum, V., and Erenburg, V., 2007, “The Role of the Recirculating Gases at the Mild Combustion Regime Formation,” ASME Turbo Expo 2007: Power for Land, Sea, and Air, pp. 271–278, Paper No. GT2007-27369.
Glarborg, P., Kee, R. J., Grcar, J. F., and Miller, J. A., 1986, “PSR: A Fortran Program for Modeling Well-Stirred Reactors,” Sandia National Laboratories, Report No. SAND86-8209.

Figures

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Fig. 1

Schematic view of MCF (mm in unit)

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Fig. 2

Schematic view of (a) computational domain and the boundary conditions, (b) side view mesh, and (c) bottom view mesh

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Fig. 3

Axial velocity profiles (a) at z = 60.5 mm, X = 0, (b) at z = 176.5 mm, X = 0, and (c) at z = 176.5 mm, x = −10 mm for case 1 in Table 1 using three different grid resolutions

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Fig. 4

Temperature distribution for case 1, in Table 1 at (a) z = 42.5 mm and (b) z = 542.5 mm

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Fig. 5

CFD predictions and WSR results for (a) reference temperature and exhaust temperature and (b) variations of exhaust CO and CO2 emissions versus equivalence ratio. Experimental data are extracted from Figs. 4 and 5 of [22].

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Fig. 6

Contours of (a) axial velocity and flow streamlines, (b) temperature, and (c) oxygen mass fraction on yz plane (x = 0) for three inlet oxidizer temperatures

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Fig. 7

Variations of mean, exhaust, and WSR temperatures with To. Solid lines represent Φ = 1 and dashed lines represent Φ = 0.9 (cases 2–7).

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Fig. 8

Variations of mixture fraction profile with To along Y-axis at x = 0 and z = 342.5 mm (cases 2–4)

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Fig. 9

Variation of exhaust emissions of CO and CO2 with To for Φ = 1 and Φ = 0.9 (cases 2–7)

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Fig. 10

Major CO-containing reaction rates along the furnace height for different oxidizer inlet temperatures (cases 2–4)

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Fig. 11

(a) Mass fraction profiles of OH radical along y-axis at z = 342.5 and x = 0 mm (cases 3 and 4) and (b) mass fraction profiles of O and H radicals along y-axis at z = 342.5 and x = 0 mm (cases 2–4)

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Fig. 12

Methane oxidation pathways in a WSR analysis at Treactor = 1540 K, tR = 1 s, p = 1 atm for (a) To = 298 K and (b) To = 723 K

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Fig. 13

Temperature contours in different slices in xy plane at Φ = 1 and To = 298 K for different inlet mass fraction of CO2 in oxidizer mixture (cases 2, 8, 9, and 10 in Table 1)

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Fig. 14

Maximum, mean, and exhaust temperatures and exhaust emissions of CO and CO2 for different inlet oxygen volume fractions at Φ = 1, P = 13 kW (cases 2, 8, 9, and 10 in Table 1)

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Fig. 15

CO-containing reaction rates profile along the furnace for cases 2, 8, 9, and 10 in Table 1

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Fig. 16

Methane oxidation pathways in a WSR analysis at Treactor = 1540 K, tR = 1 s, and p = 1 atm for XCO2 = 50% (case 10)

Tables

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