A numerical study of pulverized coal ignition by means of plasma torches in air-coal dust mixture ducts of utility boiler furnaces.

*(English)*Zbl 1140.80398Summary: Paper presents selected results of numerical simulation of processes in air-coal dust mixture duct of pulverized coal utility boiler furnace with plasma-system for pulverized coal ignition and combustion stabilization. Application of the system in utility boiler furnaces promises to achieve important savings compared with the use of heavy oil burners. Plasma torches are built in air-coal dust mixture ducts between coal mills and burners. Calculations have been performed for one of rectangular air-coal dust mixture ducts with two opposite plasma torches, used in 210 MW\(_{\text e}\) utility boiler firing pulverized Serbian lignite. The simulations are based on a three-dimensional mathematical model of mass, momentum and heat transfer in reacting turbulent gas-particle flow, specially developed for the purpose. Characteristics of processes in the duct are analyzed in the paper, with respect to the numerical results. The plasma-system thermal effect is discussed as well, regarding corresponding savings of liquid fuel. It has been emphasized that numerical simulation of the processes can be applied in optimization of pulverized coal ignition and combustion stabilization and enables efficient and cost-effective scaling-up procedure from laboratory to industrial scale.

##### MSC:

80A25 | Combustion |

80A20 | Heat and mass transfer, heat flow (MSC2010) |

76F25 | Turbulent transport, mixing |

80A32 | Chemically reacting flows |

80M20 | Finite difference methods applied to problems in thermodynamics and heat transfer |

PDF
BibTeX
XML
Cite

\textit{S. Belosevic} et al., Int. J. Heat Mass Transfer 51, No. 7--8, 1970--1978 (2008; Zbl 1140.80398)

Full Text:
DOI

##### References:

[1] | P. Pavlović, P. Stefanović, Application of plasma torches for combustion stabilization in 210MW utility boiler of Nikola Tesla thermal power plant, Study Report, Institute of Nuclear Sciences ”Vinča”, Belgrade, Serbia, 1999 (in Serbian). |

[2] | Qiu, J.; He, X.; Sun, T.; Zhao, Z.; Zhou, Y.; Gou, S.; Yhang, J.; Ma, T.: Coal gasification in steam and air medium under plasma conditions: a preliminary study, Fuel processing technology 85, 969-982 (2004) |

[3] | Yang, K. L.; Yang, R. T.: Absolute rate of the carbon – carbon dioxide reaction, Aiche journal 31, No. 8, 1313-1321 (1985) |

[4] | Johanson, J. L.: Fundamentals of coal gasification, , 1585-1586 (1981) |

[5] | Batchelde, H. R.; Busche, R. M.; Armstrong, W. P.: Kinetics of coal gasification, Industrial and engineering chemistry 45, No. 9, 1856-1871 (1953) |

[6] | Vamvuka, D.; Woodhurn, E. T.; Senior, R. Peter: Modelling of an entrained flow coal gasifier, Fuel 74, No. 10, 1452-1460 (1995) |

[7] | Sugimoto, M.; Maruta, K.; Takeda, K.; Solonenko, O. P.; Sakashita, M.; Nakamura, M.: Stabilization of pulverized coal combustion by plasma assist, Thin solid films 407, 186-191 (2002) |

[8] | Karpenko, E. I.; Messerle, V. E.; Pcregudov, V. S.: Plasma thermochemical treatment of coals for reducing the consumption of fuel oil at coal-fired thermal power stations, Thermal engineering 49, No. 1, 25-28 (2002) |

[9] | Zhukov, M. F.; Peregudov, V. S.: Plasma technology for ignition in coal-dust-fired boilers, Teploenergetika 12, 61-64 (1996) |

[10] | Messerle, A. V.: Mathematical simulation of plasma-chemical coal conversion, High energy chemistry 38, No. 1, 35-40 (2004) |

[11] | Tian, Y.; Xie, K.; Zhu, S.; Fletcher, T. H.: Simulation of coal pyrolysis in plasma jet by CPD model, Energy and fuels 15, No. 6, 1354-1358 (2001) |

[12] | Karpenko, E. I.: Comparative analysis of energetic efficiency of plasma and fire technologies of ignition, combustion and gasification of coal dust spray by using mathematical modeling of chemically non-equilibrium systems, Teplofiz. aeromekh. 3, No. 2, 289-294 (1995) |

[13] | Sijerčić, M.; Hanjalić, K.: Application of computer simulation in design study of a new concept of pulverized coal gasification, part II. Model of coal reactions and discussion of results, Combustion science and technology 97, No. 4 – 6, 351-375 (1994) |

[14] | R.V. Filkoski, S.V. Belosevic, I.J. Petrovski, S.N. Oka, M. Sijercic, Two approaches for numerical simulation of processes in systems for pulverised coal combustion, in: Proceedings of 5th Symposium of South Easl European Countries (SEEC), J. Hristov (Ed.), Transport Phenomena in Science and Technology – 2005, vol. 2, Sunny Beach Resort, Bulgaria, September 10 – 15, 2005, pp. 111 – 124. |

[15] | Bakić, V.; Nemoda, S.; Sijerčić, M.; Turanjanin, V.; Stanković, B.: Experimental and numerical investigation of premixed acetylene flame, International journal of heat and mass transfer 49, No. 21 – 22, 4023-4032 (2006) · Zbl 1108.80330 · doi:10.1016/j.ijheatmasstransfer.2006.04.008 |

[16] | Hottel, C. H.; Sarofim, F. A.: Radiative transfer, (1967) |

[17] | Smoot, L. D.; Smith, P. J.: Coal combustion and gasification, (1985) |

[18] | Vilenskij, T. V.; Hemaljan, D. M.: Dynamics of pulverized fuel combustion, (1978) |

[19] | D.B. Spalding, Development of the eddy-break-up model of turbulent combustion, in: Proceedings of the 16th International Symposium on Combustion, Cambridge, Mass., USA, August 15 – 20, 1976, pp. 1657 – 1663. |

[20] | Sijerčić, M.; Vujović, V.: Modeling of pulverized coal gasification in low-temperature plasma swirl flow, Thermophysics and aeromechanics 1, No. 3, 251-262 (1994) |

[21] | Patankar, S. V.: Numerical heat and fluid flow, (1980) · Zbl 0521.76003 |

[22] | A.D. Gosman, F.J.K. Ideriah, Guide to the TEACH-T program. Report, Mechanical Engineering Dept., Imperial College, 1976, London, UK. |

[23] | Slone, H. L.: Iterative solution of implicit approximations of multidimensional partial differential equations, SIAM journal on numerical analysis 5, No. 3, 530-558 (1968) · Zbl 0197.13304 · doi:10.1137/0705044 |

This reference list is based on information provided by the publisher or from digital mathematics libraries. Its items are heuristically matched to zbMATH identifiers and may contain data conversion errors. It attempts to reflect the references listed in the original paper as accurately as possible without claiming the completeness or perfect precision of the matching.