Computational study of fouling deposit due to surface-coated particles in coal-fired power utility boilers

Lee, Byeong E.; Fletcher, Christopher W.; Shin, Sunhye; Kwon, Soon Bum

doi:10.1016/s0016-2361(02)00127-8

Cited by 51 publications

(24 citation statements)

References 15 publications

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“…In this application framework, the fouling mechanism is mainly due to a suspension of particles. It is generally accepted that flue-ash particles are transported and then deposited on the exchanger by transport mechanisms such as turbulent diffusion, inertial impact, thermophoresis and condensation [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the air side fouling of finned tube heat exchangers

Edelin

Bariteau²,

Etourneau

et al. 2019

Heat Mass Transfer

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of the air side fouling of finned tube heat exchangers

Edelin

Bariteau²,

Etourneau

et al. 2019

Heat Mass Transfer

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“…The existing researches on simulating the particle-wall impact focus on the particle deposition characteristics on wall surface by assuming the wall surface as a smooth wall surface or a pre-fouled wall surface. For the smooth wall surface, the particle deposition rate resulted from the particle-wall impact can be obtained by the probability statistics (Lee et al, 2002;Huang et al, 1996;Venturini et al, 2012) and the semi-empirical correlations (Siegel and Nazaroff, 2003;Paz et al, 2013;Leppänen et al, 2014). In the probability statistics, the particle deposition rate is considered as a function of impact efficiency and sticking probability by dimensionless analysis.…”

Section: Introductionmentioning

confidence: 99%

Numerical model of particle deposition on fin surface of heat exchanger

Zhan

Zhuang

Ding

et al. 2016

International Journal of Refrigeration

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Dust particle deposition on fin surface has a significant influence on the performance of fin-and-tube heat exchangers, and the purpose of this study is to develop a numerical model for predicting the particle deposition rate on fin surface. In the model, the particle trajectories were calculated by the particle motion equation; the particle deposition on the fin surface was described based on the critical impact angle and the critical sticking velocity of incident particles; the particle deposition on the formed fouling layer was described based on the critical impact angle, the critical sticking velocity and the critical removal velocity of incident particles. The particle distributions on fin surface predicted by the model agree well with the images captured in the visualization experiment. The predicted particle deposition weight per unit area can describe 88% of the experimental data within a deviation of ±20% and the mean deviation is 12.8%. R c curvature radius of particle, m r,t tangential direction in rebound status R dep critical deposition rate, kg m -2 s t tubeRe p particle Reynolds number

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“…Heat transfer at the walls of a combustor depends on many parameters including ash deposition. This depends on the processes or parameters controlling the impact efficiency and the sticking efficiency [2,3]. The main problems with ash deposition are reduced heat transfer in the boiler and corrosion of the tubes.…”

Section: Introductionmentioning

confidence: 99%

Slag Behavior in Gasifiers. Part II: Constitutive Modeling of Slag

Massoudi

Wang

2013

Energies

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Abstract:The viscosity of slag and the thermal conductivity of ash deposits are among two of the most important constitutive parameters that need to be studied. The accurate formulation or representations of the (transport) properties of coal present a special challenge of modeling efforts in computational fluid dynamics applications. Studies have indicated that slag viscosity must be within a certain range of temperatures for tapping and the membrane wall to be accessible, for example, between 1,300 °C and 1,500 °C, the viscosity is approximately 25 Pa·s. As the operating temperature decreases, the slag cools and solid crystals begin to form. Since slag behaves as a non-linear fluid, we discuss the constitutive modeling of slag and the important parameters that must be studied. We propose a new constitutive model, where the stress tensor not only has a yield stress part, but it also has a viscous part with a shear rate dependency of the viscosity, along with temperature and concentration dependency, while allowing for the possibility of the normal stress effects. In Part I, we reviewed, identify and discuss the key coal ash properties and the operating conditions impacting slag behavior.

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Computational study of fouling deposit due to surface-coated particles in coal-fired power utility boilers

Cited by 51 publications

References 15 publications

Experimental investigation of the air side fouling of finned tube heat exchangers

Experimental investigation of the air side fouling of finned tube heat exchangers

Numerical model of particle deposition on fin surface of heat exchanger

Slag Behavior in Gasifiers. Part II: Constitutive Modeling of Slag

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