CFD modeling and thermodynamic analysis of a concept of a MILD-OXY combustion large scale pulverized coal boiler

A concept of a large scale pulverized coal boiler working in the oxycombustion mode has been proposed. The combustion chamber has been designed using the Moderate and Intensive Low-oxygen Dilution (MILD) combustion technology. By screening CFD solutions of several geometric configurations the best one has been selected, for which the dependence of the oxygen excess ratio and recirculation rate of the flue gases analyzed onto the efficiency of the combustion chamber has been investigated. The results of the CFD simulations have been then embedded into a process model of the entire plant. The preliminary simulations show the possibility of efficiency increase of more than 3% points.

[1]  R. Rota,et al.  MILD COMBUSTION FOR FUEL-NOx REDUCTION , 2004 .

[2]  Stephen Mills,et al.  Coal-fired CCS demonstration plants, 2012 , 2012 .

[3]  Hannes Stadler,et al.  Detailed investigation of a pulverized fuel swirl flame in CO2/O2 atmosphere , 2008 .

[4]  Chuguang Zheng,et al.  Numerical study of combustion characteristics for pulverized coal under oxy-MILD operation , 2015 .

[5]  J. Mi,et al.  Progress and recent trend in MILD combustion , 2011 .

[6]  J. Sato,et al.  A study of combustion behavior of pulverized coal in high-temperature air , 2002 .

[7]  R. Kneer,et al.  NOx-emissions from flameless coal combustion in air, Ar/O2 and CO2/O2 , 2009 .

[8]  Andrzej Ziębik,et al.  Thermoecological analysis of an oxy-fuel combustion power plant integrated with a CO2 processing unit , 2015 .

[9]  A. Gupta,et al.  High Temperature Air Combustion: From Energy Conservation to Pollution Reduction , 2002 .

[10]  Andrzej Ziębik,et al.  System approach to the energy analysis of an integrated oxy-fuel combustion power plant , 2012 .

[11]  Tapio Westerlund,et al.  1st South East European Conference on Sustainable Development of Energy, Water and Environment Systems (SEE-SDEWES) 29 June - 3 July, 2014, Ohrid, Republic of Macedonia , 2014 .

[12]  Gabriel Węcel,et al.  Simulations of the PC boiler equipped with complex swirling burners , 2014 .

[13]  C. Bouallou,et al.  Pre-combustion, post-combustion and oxy-combustion in thermal power plant for CO2 capture , 2010 .

[14]  Christopher R. Shaddix,et al.  Combustion kinetics of coal chars in oxygen-enriched environments , 2006 .

[15]  S. Patankar,et al.  Finite volume method for radiation heat transfer , 1994 .

[16]  M. Pourkashanian,et al.  Combustion modelling opportunities and challenges for oxy-coal carbon capture technology , 2011 .

[17]  Sze Zheng Yong,et al.  Oxy-fuel combustion of pulverized coal: Characterization, fundamentals, stabilization and CFD modeling , 2012 .

[18]  Günter Scheffknecht,et al.  Oxyfuel combustion for CO2 capture in power plants , 2015 .

[19]  R. Weber,et al.  On the (MILD) combustion of gaseous, liquid, and solid fuels in high temperature preheated air , 2005 .

[20]  Andrzej Szlek,et al.  Novel conceptual design of a supercritical pulverized coal boiler utilizing high temperature air combustion (HTAC) technology , 2010 .

[21]  Mario Amelio,et al.  Numerical Investigation of Oxy-mild Combustion of Pulverized Coal in a Pilot Furnace , 2016 .

[22]  J. Wunning,et al.  Flameless oxidation to reduce thermal no-formation , 1997 .

[23]  Andrzej Ziębik,et al.  System approach to the analysis of an integrated oxy-fuel combustion power plant , 2014 .

[24]  Jonathan Tennyson,et al.  HITEMP, the high-temperature molecular spectroscopic database , 2010 .

[25]  Wojciech Stanek,et al.  Thermodynamic assessment of an integrated MILD oxyfuel combustion power plant , 2017 .

[26]  S. A. Morsi,et al.  An investigation of particle trajectories in two-phase flow systems , 1972, Journal of Fluid Mechanics.

[27]  Bassam B. Dally,et al.  Importance of Initial Momentum Rate and Air-Fuel Premixing on Moderate or Intense Low Oxygen Dilution (MILD) Combustion in a Recuperative Furnace , 2009 .

[28]  B. Launder,et al.  The numerical computation of turbulent flows , 1990 .