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Journal of Thermal Science

, Volume 28, Issue 1, pp 40–50 | Cite as

Effects of High-temperature Char Layer and Pyrolysis Gas on NOx Reduction in a Typical Decoupling Combustion Coal-fired Stove

  • Honglin Li
  • Jian Han
  • Nan ZhangEmail author
  • Xinhua Liu
  • Jingdong He
  • Wei Du
Article
  • 39 Downloads

Abstract

The suppression of nitrogen oxides (NOx) is the key to reducing pollutant emission of a domestic coal-fired stove due to the limitation of technology condition and economic cost. The decoupling combustion (DC) technology invented by Institute of Process Engineering (IPE), Chinese Academy of Sciences (CAS) is characterized by that a traditional stove is separated into a pyrolysis and a combustion chamber as well as a bottom passage between them. In this study, the combustion of briquette from bituminous coal in different operation modes in a typical decoupling stove is tested and simulated to validate the advantage of DC technology over so-called reverse combustion. The smokeless and high-efficiency combustion of bituminous briquette with low emissions of NOx and CO can be implemented by utilizing low NOx combustion under low temperature and reduction atmosphere in the pyrolysis chamber as well as after-combustion of char and pyrolysis gas under high temperature and oxidation atmosphere in the combustion chamber. The effects of the main reducing components in pyrolysis gas as well as char on NOx reduction were numerically investigated in this study, which shows that the reducing ability increases gradually from CH4, CO to char, but the combined reducing ability of them cannot be determined by a simple addition.

Keywords

decoupling combustion low NOx emission domestic stove numerical simulation bituminous briquette thermal efficiency 

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Notes

Acknowledgments

We would like to thank financial supports from the “Transformational Technologies for Clean Energy and Demonstration”, Strategic Priority Research Program of Chinese Academy of Sciences (No. XDA21040400) and the National Natural Science Foundation of China (Nos. 21376244 and 91334107). We also thank Prof. Weigang Lin and SN ENGR. Jiangping Hao for their valuable discussion with the authors. It is very much appreciated that Yankuang Group Co., Ltd. provided us the briquette from bituminous coal.

References

  1. [1]
    Rohde R.A., Muller R.A., Air pollution in China: Mapping of concentrations and sources. Plos One 2013, 10: e0135749.CrossRefGoogle Scholar
  2. [2]
    Ianniello A., Spataro F., Esposito G., et al., Chemical characteristics of inorganic ammonium salts in PM 2.5 in the atmosphere of Beijing (China). Atmospheric Chemistry and Physics, 2011, 11: 10803–10822.ADSCrossRefGoogle Scholar
  3. [3]
    Li J., Xu G., Yang L., et al., A NOx-suppressed smokeless coal combustion method and application in coal-fired furnace. CN 95102081.1, 1995.Google Scholar
  4. [4]
    Li J., Bai Y., Song W., NOx-suppressed smokeless coal combustion technique. International Symposium on Clean Coal Technology, Xiamen, China. 1997.Google Scholar
  5. [5]
    He J., Song W., Gao S., et al., Experimental study of the reduction mechanisms of NO emission in decoupling combustion of coal. Fuel Processing Technology, 2006, 87: 803–810.CrossRefGoogle Scholar
  6. [6]
    Hao J., Gao S., Sun G., et al., Status of coal-fired industrial boilers and development of decoupling combustion technique. Industrial Boiler, 2014, 169: 7–11.Google Scholar
  7. [7]
    Van Der Lans R.P., Pedersen L.T., Jensen A., et al., Modelling and experiments of straw combustion in a grate furnace. Biomass and Bioenergy, 2000, 19: 199–208.CrossRefGoogle Scholar
  8. [8]
    Shin D., Choi S., The combustion of simulated waste particles in a fixed bed. Combustion and Flame, 2000, 121: 167–180.CrossRefGoogle Scholar
  9. [9]
    Hermansson S., Thunman H., CFD modelling of bed shrinkage and channelling in fixed-bed combustion. Combustion and Flame, 2011; 158: 988–999.CrossRefGoogle Scholar
  10. [10]
    Yang Y.B., Goh Y.R., Zakaria R., et al., Mathematical modelling of MSW incineration on a travelling bed. Waste Management, 2002, 22: 369–380.CrossRefGoogle Scholar
  11. [11]
    Collazo J., Porteiro J., Patino D., et al., Numerical modeling of the combustion of densified wood under fixed-bed conditions. Fuel, 2012, 93: 149–159.CrossRefGoogle Scholar
  12. [12]
    Duffy N.T.M., Eaton J.A., Investigation of factors affecting channelling in fixed-bed solid fuel combustion using CFD. Combustion and Flame, 2013, 160: 2204–2220.CrossRefGoogle Scholar
  13. [13]
    Peters B., Measurements and application of a discrete particle model (DPM) to simulate combustion of a packed bed of individual fuel particles. Combustion and Flame, 2002, 131: 132–146.CrossRefGoogle Scholar
  14. [14]
    Simsek E., Brosch B., Wirtz S., et al., Numerical simulation of grate firing systems using a coupled CFD/discrete element method (DEM). Powder Technology, 2009, 193: 266–273.CrossRefGoogle Scholar
  15. [15]
    Anca-Couce A., Zobel N., Jakobsen H.A., Multi-scale modeling of fixed-bed thermo-chemical processes of biomass with the representative particle model: Application to pyrolysis. Fuel, 2013, 103: 773–782.CrossRefGoogle Scholar
  16. [16]
    Mehrabian R., Zahirovic S., Scharler R., et al., A CFD model for thermal conversion of thermally thick biomass particles. Fuel Processing Technology, 2012, 95: 96–108.CrossRefGoogle Scholar
  17. [17]
    Mehrabian R., Shiehnejadhesar A., Scharler R., et al., Multi-physics modelling of packed bed biomass combustion. Fuel, 2014, 122: 164–178.CrossRefGoogle Scholar
  18. [18]
    Ström H., Thunman H., CFD simulations of biofuel bed conversion: A submodel for the drying and devolatilization of thermally thick wood particles. Combustion and Flame, 2013, 160: 417–431.CrossRefGoogle Scholar
  19. [19]
    Abbas T., Costa M., Costen P., et al., NOX formation and reduction mechanisms in pulverized coal flames. Fuel, 1994, 73: 1423–1436.CrossRefGoogle Scholar
  20. [20]
    Williams A., Pourkashanian M., Jones J.M., et al., A review of NOx formation and reduction mechanisms in combustion systems, with particular reference to coal. Journal of the Energy Institute, 1997, 70: 102–113.Google Scholar
  21. [21]
    Johnsson J.E., Formation and reduction of nitrogen oxides in fluidized-bed combustion. Fuel, 1994, 73: 1398–1415.CrossRefGoogle Scholar
  22. [22]
    Watanabe H., Yamamoto J., Okazaki K., NOX formation and reduction mechanisms in staged O2/CO2 combustion. Combustion and Flame, 2011, 158: 1255–1263.CrossRefGoogle Scholar
  23. [23]
    Glarborg P., Jensen A.D., Johnsson J.E., Fuel nitrogen conversion in solid fuel fired systems. Progress in Energy and Combustion Science, 2003, 29: 89–113.CrossRefGoogle Scholar
  24. [24]
    Hill S.D., Modeling of nitrogen oxides formation and destruction in combustion systems. Progress in Energy and Combustion Science, 2000, 26: 417–458.CrossRefGoogle Scholar
  25. [25]
    Álvarez L., Gharebaghi M., Jones J.M., et al., CFD modeling of oxy-coal combustion: prediction of burnout, volatile and NO precursors release. Applied Energy, 2013, 104: 653–665.CrossRefGoogle Scholar
  26. [26]
    Le Bris T., Cadavid F., Caillat S., et al., Coal combustion modelling of large power plant, for NOX abatement. Fuel, 2007, 86: 2213–2220.CrossRefGoogle Scholar
  27. [27]
    Choi C.R., Kim C.N., Numerical investigation on the flow, combustion and NOX emission characteristics in a 500 MWe tangentially fired pulverized-coal boiler. Fuel, 2009, 88: 1720–1731.CrossRefGoogle Scholar
  28. [28]
    Askarova A., Bolegenova S., Maximov V., et al., Numerical modeling of pulverized coal combustion at thermal power plant boilers. Journal of Thermal Science, 2015, 24: 275–282.ADSCrossRefGoogle Scholar
  29. [29]
    Zhou H., Mo G., Si D., et al., Numerical simulation of the NOX emissions in a 1000 MW tangentially fired pulverized-coal boiler: influence of the multi-group arrangement of the separated over fire air. Energy & Fuels, 2011, 25: 2004–2012.CrossRefGoogle Scholar
  30. [30]
    Houshfar E, Skreiberg Ø, Løvås T, et al. Effect of excess air ratio and temperature on NOX emission from grate combustion of biomass in the staged air combustion scenario. Energy & Fuels, 2011, 25: 4643–4654.CrossRefGoogle Scholar
  31. [31]
    Yin C., Rosendahl L.A., Ker S.K., Grate-firing of biomass for heat and power production, Progress in Energy and Combustion Science, 2008, 34: 725–754.CrossRefGoogle Scholar
  32. [32]
    Yin C., Rosendahl L., Kær S.K., et al., Mathematical modeling and experimental study of biomass combustion in a thermal 108 MW grate-fired boiler. Energy & Fuels, 2008, 22: 1380–1390.CrossRefGoogle Scholar
  33. [33]
    Staiger B., Unterberger S., Berger R., et al., Development of an air staging technology to reduce NOX emissions in grate fired boilers. Energy, 2005, 30: 1429–1438.CrossRefGoogle Scholar
  34. [34]
    Yin C., Rosendahl L., Clausen S., et al., Characterizing and modeling of an 88 MW grate-fired boiler burning wheat straw: experience and lessons. Energy, 2012, 41: 473–482.CrossRefGoogle Scholar
  35. [35]
    Zhou H., Jensen A.D., Glarborg P., et al., Formation and reduction of nitric oxide in fixed-bed combustion of straw. Fuel, 2006, 85: 705–716.CrossRefGoogle Scholar
  36. [36]
    Aho M.J., Hämäläinen J.P., Tummavuori J.L., Importance of solid fuel properties to nitrogen oxide formation through HCN and NH3 in small particle combustion. Combustion and Flame, 1993, 95: 22–30.CrossRefGoogle Scholar
  37. [37]
    Klason T., Bai X.S., Computational study of the combustion process and NO formation in a small-scale wood pellet furnace. Fuel, 2007, 86: 1465–1474.CrossRefGoogle Scholar
  38. [38]
    Stubenberger G., Scharler R., Zahirovic S., et al., Experimental investigation of nitrogen species release from different solid biomass fuels as a basis for release models. Fuel, 2008, 87: 793–806.CrossRefGoogle Scholar
  39. [39]
    Bugge M., Skreiberg Ø., Haugen N.E.L., et al., Numerical Simulations of Staged Biomass Grate Fired Combustion with an Emphasis on NOX Emissions. Energy Procedia, 2015, 75: 156–161.CrossRefGoogle Scholar
  40. [40]
    Sartor K., Restivo Y., Ngendakumana P., et al., Prediction of SOX, and NOX, emissions from a medium size biomass boiler. Biomass & Bioenergy, 2014, 65: 91–100.CrossRefGoogle Scholar
  41. [41]
    Ansys Fluent Inc. Ansys Fluent 17.0 user's guide, USA, 2016.Google Scholar
  42. [42]
    Shih T.H., Liou W.W., Shabbir A., et al., A new k-ϵ eddy viscosity model for high Reynolds number turbulent flows. Computers & Fluids, 1995, 24: 227–238.CrossRefzbMATHGoogle Scholar
  43. [43]
    Cheng P., Two-dimensional radiating gas flow by a moment method. AIAA Journal, 1964, 2: 1662–1664.ADSMathSciNetCrossRefzbMATHGoogle Scholar
  44. [44]
    Smith T.F., Shen Z.F., Friedman J.N., Evaluation of coefficients for the weighted sum of gray gases mode. Journal of Heat Transfer, 1982, 104: 602–608.CrossRefGoogle Scholar
  45. [45]
    Baum M.M., Street P.J., Predicting the combustion behavior of coal particles. Combustion Science and Technology, 1971, 3: 231–243.CrossRefGoogle Scholar
  46. [46]
    Badzioch S., Hawksley P.G.W., Kinetics of thermal decomposition of pulverized coal particles. Industrial & Engineering Chemistry Process Design and Development, 1970, 9: 521–530.CrossRefGoogle Scholar
  47. [47]
    Kobayashi H., Howard J.B., Sarofim A.F., Coal devolatilization at high temperatures. Symposium (International) on Combustion, 1977, 16: 411–425.CrossRefGoogle Scholar
  48. [48]
    Solomon P.R., Serio M.A., Suuberg E.M., Coal pyrolysis: experiments, kinetic rates and mechanisms. Progress in Energy and Combustion Science, 1992, 18: 133–220.CrossRefGoogle Scholar
  49. [49]
    Desroches-Ducarne E., Dolignier J.C., Marty E., et al., Modelling of gaseous pollutants emissions in circulating fluidized bed combustion of municipal refuse. Fuel, 1998, 77: 1399–1410.CrossRefGoogle Scholar
  50. [50]
    Wall T., Liu Y., Spero C., et al., An overview on oxyfuel coal combustion—state of the art research and technology development. Chemical Engineering Research and Design, 2009, 87: 1003–1016.CrossRefGoogle Scholar
  51. [51]
    Wang C., Berry G.F., Chang K., et al., Combustion of pulverized coal using waste carbon dioxide and oxygen. Combustion and Flame, 1988, 72: 301–310.CrossRefGoogle Scholar
  52. [52]
    Hecht E.S., Shaddix C.R., Lighty J.A.S., Analysis of the errors associated with typical pulverized coal char combustion modeling assumptions for oxy-fuel combustion. Combustion and Flame, 2013, 160: 1499–1509.CrossRefGoogle Scholar
  53. [53]
    Johansson R., Thunman H., Leckner B., Influence of intraparticle gradients in modeling of fixed bed combustion. Combustion and Flame, 2007, 149: 49–62.CrossRefGoogle Scholar
  54. [54]
    AF S., Formation of NO and N2O in coal combustion-the relative importance of volatile and char nitrogen. Journal of the Institute of Energy, 1993, 66: 207–215.Google Scholar
  55. [55]
    Miller J.A., Bowman C.T., Mechanism and modeling of nitrogen chemistry in combustion. Progress in Energy and Combustion Science, 1989, 15: 287–338.CrossRefGoogle Scholar
  56. [56]
    Glarborg P., Miller J.A., Kee R.J., Kinetic modeling and sensitivity analysis of nitrogen oxide formation in wellstirred reactors. Combustion and Flame, 1986, 65: 177–202.CrossRefGoogle Scholar
  57. [57]
    Moskaleva L.V., Lin M.C., The spin-conserved reaction CH+ N2→ H+ NCN: A major pathway to prompt NO studied by quantum/statistical theory calculations and kinetic modeling of rate constant. Proceedings of the Combustion Institute, 2000, 28: 2393–2401.CrossRefGoogle Scholar
  58. [58]
    Werther J., Saenger M., Hartge E.U., et al., Combustion of agricultural residues. Progress in Energy and Combustion Science, 2000, 26: 1–27.CrossRefGoogle Scholar
  59. [59]
    Aho M.J., Hämäläinen J.P., Tummavuori J.L., Importance of solid fuel properties to nitrogen oxide formation through HCN and NH3 in small particle combustion. Combustion and Flame, 1993, 95: 22–30.CrossRefGoogle Scholar
  60. [60]
    Zhang H., Fletcher T.H., Nitrogen transformations during secondary coal pyrolysis. Energy & Fuels, 2001, 15: 1512–1522.CrossRefGoogle Scholar
  61. [61]
    Rüdiger H., Greul U., Spliethoff H., et al., Distribution of fuel nitrogen in pyrolysis products used for reburning. Fuel, 1997, 76: 201–205.CrossRefGoogle Scholar
  62. [62]
    Bassilakis R., Zhao Y., Solomon P.R., et al., Sulfur and nitrogen evolution in the Argonne coals. Experiment and modeling. Energy & Fuels, 1993, 7: 710–720.CrossRefGoogle Scholar
  63. [63]
    Song Y., Pohl J.H., Beer J.M., et al., Nitric oxide formation during pulverized coal combustion. Combustion Science and Technology, 1982, 28: 31–40.CrossRefGoogle Scholar
  64. [64]
    Hill S.C., Smoot L.D., Smith P.J., Prediction of nitrogen oxide formation in turbulent coal flames. Symposium (International) on Combustion, 1985, 20: 1391–1400.CrossRefGoogle Scholar
  65. [65]
    Wendt J.O.L., Fundamental coal combustion mechanisms and pollutant formation in furnaces. Progress in Energy and Combustion Science, 1980, 6: 201–222.CrossRefGoogle Scholar
  66. [66]
    Xie J., Yang X., Zhu W., et al., Nitrogen transformation during coal decoulping combustion I: release behavior of coal-nitrogen during pyrolysis stage. Journal of Fuel Chemistry and Technology, 2012, 40: 919–926.Google Scholar
  67. [67]
    Desroches-Ducarne E., Dolignier J.C., Marty E., et al., Modelling of gaseous pollutants emissions in circulating fluidized bed combustion of municipal refuse. Fuel, 1998, 77: 1399–1410.CrossRefGoogle Scholar
  68. [68]
    Jensen A., Johnsson J.E., Andries J., et al., Formation and reduction of NOX in pressurized fluidized bed combustion of coal. Fuel, 1995, 74: 1555–1569.CrossRefGoogle Scholar
  69. [69]
    Chen W., Smoot L.D., Fletcher T.H., et al., A computational method for determining global fuel-NO rate expressions. Part 1. Energy & Fuels, 1996, 10: 1036–1045.CrossRefGoogle Scholar

Copyright information

© Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Honglin Li
    • 1
    • 4
  • Jian Han
    • 1
    • 2
  • Nan Zhang
    • 1
    Email author
  • Xinhua Liu
    • 1
  • Jingdong He
    • 3
  • Wei Du
    • 4
  1. 1.State Key Laboratory of Multiphase Complex SystemsInstitute of Process Engineering, Chinese Academy of SciencesBeijingChina
  2. 2.University of Chinese Academy of SciencesBeijingChina
  3. 3.Chinese Academy of SciencesBeijingChina
  4. 4.State Key Laboratory of Heavy Oil ProcessingChina University of PetroleumBeijingChina

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