Satish Kumar Dewangan, Moode Praveen Kumar Naik, Vivek Deshmukh

PARAMETRIC STUDY OF THE NON-PREMIXED COAL COMBUSTION IN FURNACE FOR HEAT TRANSFER AND EMISSION CHARACTERISTICS

Steady-state turbulent non-premixed combustion of pulverized coal has been modeled in the two-dimensional furnace. Pulverized coal of three different types, low volatiles coal, medium volatile coal and high volatile coal, has been considered. The coal is injected through the center of the furnace and air is being supplied with two inlets (top inlet and bottom inlet) at different velocities. Taking advantage of the symmetry, only one half of the domain is considered. Results have been validated with the experimental data for furnace temperature distribution. Effect of variation of parameters such as top air velocity, bottom air velocity, air temperature, furnace wall temperature and mass flow rate of coal are discussed for all three different types of coal. The effect of these various parameters has been discussed upon peak temperature inside the furnace, heat transfer to/from the system to surroundings and emission of gases like compounds of NO, CO and CO2. The analysis has been carried out using Ansys-Fluent software.

Keywords:

Non-premixed Combustion, Coal Combustion, Computational Fluid Dynamics Combustion Modeling, Pollutant Emission, Nox Emission,

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[1] Holkar R. CFD Anlysis of Pulverised-Coal Combustion of Burner Used In Furnace with Different Radiation Models. IOSR J Mech Civ Eng 2013;5:25–34.
[2] Marek E, Świątkowski B. Experimental studies of single particle combustion in air and different oxy-fuel atmospheres. Appl Therm Eng 2014;66:35–42. https://doi.org/https://doi.org/10.1016/j.applthermaleng.2014.01.070.
[3] Bhuiyan AA, Naser J. CFD modelling of co-firing of biomass with coal under oxy-fuel combustion in a large scale power plant. Fuel 2015;159:150–68. https://doi.org/https://doi.org/10.1016/j.fuel.2015.06.058.
[4] Elattar HF, Stanev R, Specht E, Fouda A. CFD simulation of confined non-premixed jet flames in rotary kilns for gaseous fuels. Comput Fluids 2014;102:62–73. https://doi.org/https://doi.org/10.1016/j.compfluid.2014.05.033.
[5] Yu B, Lee S, Lee C-E. Study of NOx emission characteristics in CH4/air non-premixed flames with exhaust gas recirculation. Energy 2015;91:119–27. https://doi.org/https://doi.org/10.1016/j.energy.2015.08.023.
[6] Mohamed Ismail H, Ng HK, Gan S. Evaluation of non-premixed combustion and fuel spray models for in-cylinder diesel engine simulation. Appl Energy 2012;90:271–9. https://doi.org/https://doi.org/10.1016/j.apenergy.2010.12.075.
[7] Yin C. On gas and particle radiation in pulverized fuel combustion furnaces. Appl Energy 2015;157:554–61. https://doi.org/https://doi.org/10.1016/j.apenergy.2015.01.142.
[8] Gómez MA, Porteiro J, Patiño D, Míguez JL. Eulerian CFD modelling for biomass combustion. Transient simulation of an underfeed pellet boiler. Energy Convers Manag 2015;101:666–80. https://doi.org/https://doi.org/10.1016/j.enconman.2015.06.003.
[9] Cheng X, Ng HK, Gan S, Ho JH, Pang KM. Development and validation of a generic reduced chemical kinetic mechanism for CFD spray combustion modelling of biodiesel fuels. Combust Flame 2015;162:2354–70. https://doi.org/https://doi.org/10.1016/j.combustflame.2015.02.003.
[10] Gövert S, Mira D, Kok JBW, Vázquez M, Houzeaux G. Turbulent combustion modelling of a confined premixed jet flame including heat loss effects using tabulated chemistry. Appl Energy 2015;156:804–15. https://doi.org/https://doi.org/10.1016/j.apenergy.2015.06.031.
[11] Taamallah S, Vogiatzaki K, Alzahrani FM, Mokheimer EMA, Habib MA, Ghoniem AF. Fuel flexibility, stability and emissions in premixed hydrogen-rich gas turbine combustion: Technology, fundamentals, and numerical simulations. Appl Energy 2015;154:1020–47. https://doi.org/https://doi.org/10.1016/j.apenergy.2015.04.044.
[12] Ziani L, Chaker A, Chetehouna K, Malek A, Mahmah B. Numerical simulations of non-premixed turbulent combustion of CH4–H2 mixtures using the PDF approach. Int J Hydrogen Energy 2013;38:8597–603. https://doi.org/https://doi.org/10.1016/j.ijhydene.2012.11.104.
[13] Li P, Wang F, Mi J, Dally BB, Mei Z, Zhang J, et al. Mechanisms of NO formation in MILD combustion of CH4/H2 fuel blends. Int J Hydrogen Energy 2014;39:19187–203. https://doi.org/https://doi.org/10.1016/j.ijhydene.2014.09.050.
[14] Rahmanian B, Safaei MR, Kazi SN, Ahmadi G, Oztop HF, Vafai K. Investigation of pollutant reduction by simulation of turbulent non-premixed pulverized coal combustion. Appl Therm Eng 2014;73:1222–35. https://doi.org/https://doi.org/10.1016/j.applthermaleng.2014.09.016.
[15] Fischer P, Schiemann M, Scherer V, Maas P, Schmid G, Taroata D. A numerical model of the combustion of single lithium particles with CO2. Fuel 2015;160:87–99. https://doi.org/https://doi.org/10.1016/j.fuel.2015.07.033.
[16] Zhou L, Liu Z, Wang Z. Numerical study of influence of biofuels on the combustion characteristics and performance of aircraft engine system. Appl Therm Eng 2015;91:399–407. https://doi.org/https://doi.org/10.1016/j.applthermaleng.2015.08.018.
[17] Muppala S, Manickam B, Dinkelacker F. A Comparative Study of Different Reaction Models for Turbulent Methane/Hydrogen/Air Combustion. J Therm Eng 2015;1:367. https://doi.org/10.18186/jte.60394.
[18] Karyeyen S, Ilbas M. Experimental and numerical analysis of turbulent premixed combustion of low calorific value coal gases in a generated premixed burner. Fuel 2018;220:586–98. https://doi.org/https://doi.org/10.1016/j.fuel.2018.02.052.
[19] Mao Z, Zhang L, Zhu X, Zhou D, Liu W, Zheng C. Investigation on coal moderate or intense low-oxygen dilution combustion with high-velocity jet at pilot-scale furnace. Appl Therm Eng 2017;111:387–96. https://doi.org/https://doi.org/10.1016/j.applthermaleng.2016.09.085.
[20] Saha M, Dally BB, Medwell PR, Chinnici A. Effect of particle size on the MILD combustion characteristics of pulverised brown coal. Fuel Process Technol 2017;155:74–87. https://doi.org/https://doi.org/10.1016/j.fuproc.2016.04.003.
[21] Sudarma A, Al-Witry A, Morsy M. Rans numerical simulation of lean premixed bluff body stabilized combustor: Comparison of turbulence models. J Therm Eng 2017;3:1561–73. https://doi.org/10.18186/journal-of-thermal-engineering.353668.
[22] Li S, Xu Y, Gao Q. Measurements and modelling of oxy-fuel coal combustion. Proc Combust Inst 2019;37:2643–61. https://doi.org/https://doi.org/10.1016/j.proci.2018.08.054.
[23] Abay M. Computational fluid dynamics analysis of flow and combustion of a diesel engine. J Therm Eng 2018;4:1878–95. https://doi.org/10.18186/journal-of-thermal-engineering.388333.
[24] Angeline A. Power generation from combusted “Syngas” using hybrid thermoelectric generator and forecasting the performance with ANN technique. J Therm Eng 2018;4:2149–68. https://doi.org/10.18186/journal-of-thermal-engineering.433806.
[25] Naik MPK, Dewangan SK. CFD modeling of non-premixed combustion of pulverized coal in a furnace. Comput Therm Sci 2017;9:195–211. https://doi.org/10.1615/ComputThermalScien.2017019027.
[26] Pillai KK. Influence of Coal Type on Devolatilization and Combustion in Fluidized Beds. J Inst Energy 1981;54:142–50.

Başlangıç: 2015
Yayıncı: YILDIZ TEKNİK ÜNİVERSİTESİ

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