Coal combustion modelling of large power plant, for NOx abatement

Bris, Thomas Le; Cadavid, Francisco; Caillat, S.; Pietrzyk, S.; Blondin, J.; Baudoin, B.

doi:10.1016/j.fuel.2007.05.054

Cited by 89 publications

(39 citation statements)

References 9 publications

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“…For Fuel NOx, nitrogen exists in both volatile and char. De Soete model was adopted for volatile NOx formation [5] , while char nitrogen oxidized to NOx by N in some form. Turbulence interaction of temperature and species was taken into consideration.…”

Section: Mathematical Model and Calculation Methodsmentioning

confidence: 99%

Numerical simulation of the effect of over-fire air on NOx formation in furnace

Wang

Er-peng

Guo

et al. 2013

2013 International Conference on Materials for Renewable Energy and Environment

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Numerical simulations were conducted for an 800MW ultra-supercritical utility boiler. The influences of over-fire air on distributions of temperature, oxygen concentration and NOx concentration were investigated. The results indicate that the using of OFA made a significant influence on parameters in the primary combustion zone. The temperature, oxygen concentration and NOx concentration all decreased here. In addition, Fuel NOx and Thermal NOx were analyzed individually. The formation of Fuel NOx was mainly affected by temperature and oxygen concentration. Thermal NOx increased dramatically with increasing temperature when the temperature exceeded a certain value. According to the result of simulation, the NOx concentration at furnace exit decreased 31.4% comparatively using OFA.

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Section: Mathematical Model and Calculation Methodsmentioning

confidence: 99%

Numerical simulation of the effect of over-fire air on NOx formation in furnace

Wang

Er-peng

Guo

et al. 2013

2013 International Conference on Materials for Renewable Energy and Environment

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“…Results are significantly affected by the choice of CFD model used for pulverized coal combustion simulation, and many researchers report more realistic predictions of flame temperatures using particular models (21)(22)(23)(24)(25). CFD simulations were performed using a pressure-based, steady-state, segregated implicit solver.…”

Section: Cfd Modeling and Experimental Studymentioning

confidence: 99%

The Effect of Temperature Distribution on Tube Rupture

Aydin

Durak

2012

JTST

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This paper reports the effect of temperature distribution on tube rupture at the pulverized coal fired thermal power plant. A computational model was applied to a 150 MWe boiler burning high-ash, medium-volatile coal. The radial and axial flame temperature distribution in the boiler was simulated using CFD code FLUENT. Flame temperatures were measured at points close to wall in some boiler levels and compared with computational fluid dynamics (CFD) solutions. CFD analysis showed that the flame shaped in the centre of the boiler and the temperature decreased gradually towards the boiler walls. The coal and ash composition was analyzed, and tube thickness was measured. Analysis showed that the ash and chlorine content of the coal, and SiO 2 content of the ash were very high. Deposits on tubes can occur overheating, fouling and slagging which lead to tube ruptures. The abrasive effect of the ash accelerated thinning of the tubes and caused them to rupture.

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“…Several approaches have been developed in order to reduce the pollutant emissions in industrial furnaces: for instance, the introduction of the moderate and intense low oxygen dilution (MILD) technology in pulverized coal combustion to reduce the NO x emissions [8,9]; the pulverized coal oxy-fuel combustion, with CO 2 capture from flue gas [10][11][12]; the combustion of syngas derived from waste biomass [13][14][15]; the co-firing of biomass and coal [16][17][18]. The research activities in this field are strictly dependent on a good understanding of the coal combustion processes in industrial applications, even though data concerning coal combustion are mostly obtained in laboratory-scale experiments, operating far from the actual industrial conditions [19]. Since there are few experimental measurements in industrial furnaces [19,20] and laboratory tests on full-scale burners are not easily practicable, numerical simulations can be used, being a common aid in order to investigate multiphase and combustion problems in a wide range of physical and engineering applications.…”

Section: Introductionmentioning

confidence: 99%

“…The research activities in this field are strictly dependent on a good understanding of the coal combustion processes in industrial applications, even though data concerning coal combustion are mostly obtained in laboratory-scale experiments, operating far from the actual industrial conditions [19]. Since there are few experimental measurements in industrial furnaces [19,20] and laboratory tests on full-scale burners are not easily practicable, numerical simulations can be used, being a common aid in order to investigate multiphase and combustion problems in a wide range of physical and engineering applications. In particular, the combustion of pulverized coal within combustion chambers has been studied numerically, due to the recent interest in this type of combustion technology.…”

Section: Introductionmentioning

confidence: 99%

Assessment against Experiments of Devolatilization and Char Burnout Models for the Simulation of an Aerodynamically Staged Swirled Low-NOx Pulverized Coal Burner

et al. 2017

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Abstract:In the next few years, even though there will be a continuous growth of renewables and a loss of the share of fossil fuel, energy production will still be strongly dependent on fossil fuels. It is expected that coal will continue to play an important role as a primary energy source in the next few decades due to its lower cost and higher availability with respect to other fossil fuels. However, in order to improve the sustainability of energy production from fossil fuels, in terms of pollutant emissions and energy efficiency, the development of advanced investigation tools is crucial. In particular, computational fluid dynamics (CFD) simulations are needed in order to support the design process of low emission burners. Even if in the literature several combustion models can be found, the assessment of their performance against detailed experimental measurements on full-scale pulverized coal burners is lacking. In this paper, the numerical simulation of a full-scale low-NO x , aerodynamically-staged, pulverized coal burner for electric utilities tested in the 48 MW th plant at the Combustion Environment Research Centre (CCA -Centro Combustione e Ambiente) of Ansaldo Caldaie S.p.A. in Gioia del Colle (Italy) is presented. In particular, this paper is focused on both devolatilization and char burnout models. The parameters of each model have been set according to the coal characteristics without any tuning based on the experimental data. Thanks to a detailed description of the complex geometry of the actual industrial burner and, in particular, of the pulverized coal inlet distribution (considering the entire primary air duct, in order to avoid any unrealistic assumption), a correct selection of both devolatilization and char burnout models and a selection of suited parameters for the NO x modeling, accurate results have been obtained in terms of NO x formation. Since the model parameters have been evaluated a priori, the numerical approach proposed here could be suitable to be applied as a performance prediction tool in the design of pulverized coal burners.

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Coal combustion modelling of large power plant, for NOx abatement

Cited by 89 publications

References 9 publications

Numerical simulation of the effect of over-fire air on NOx formation in furnace

Numerical simulation of the effect of over-fire air on NOx formation in furnace

The Effect of Temperature Distribution on Tube Rupture

Assessment against Experiments of Devolatilization and Char Burnout Models for the Simulation of an Aerodynamically Staged Swirled Low-NOx Pulverized Coal Burner

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