An integrated theoretical fouling model for convective heating surfaces in coal-fired boilers

Pan, Yadi; Si, Fengqi; Xu, Zhao‐Dong; Romero, Carlos E.

doi:10.1016/j.powtec.2011.03.008

Cited by 59 publications

(20 citation statements)

References 32 publications

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“…The existing researches on simulating the particle-fouling layer impact only focus on the deposition of incident particles or the removal of bed particles. For the deposition of incident particles, the incident particles may either stick on or rebound from fouling layer, which is similar to that in particle-wall impact process (Pan et al, 2011). For the removal of bed particles, the bed particles may either keep still or remove from fouling layer, and the behaviors of bed particles are determined by the incident particle impact and the influence of air flow.…”

Section: Introductionmentioning

confidence: 94%

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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Section: Introductionmentioning

confidence: 94%

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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“…Flue gas of fly ash particles adhesion on wet dust collecting surface similar to the process of sulfur acid bead, but because of different density, different surface shape and is slightly different [11][12][13].In fact, when the flue gas temperature is lower than under the condition of the sulfuric acid dew point, parts of the flue gas sulfur acid beads are often wrapped in fly ash particles, that is to say, the fly ash particles with sulfuric acid bead, appearance is a ball. Gravity, viscous force, condensing core can be explained by the fly ash particles and the intrinsic reason sulfur acid bead together.…”

Section: Wet Dust Formation and The Trendmentioning

confidence: 99%

“…Total sulfur acid bead in the flue gas can use arb sulfur content of coal and water estimates. In a specific environment, the number of sulfur acid bead will adhesion to the surface of a wet dust, is one of the main characteristics of wet dust description [11][12][13]. In a typical staggered tube bundle of heating surface, the flue in the tube bundle is bend rules, trace of flue gas molecules is continuous, and not with wet dust collecting surface intersection.…”

Section: Wet Dust Formation and The Trendmentioning

confidence: 99%

Research on the mechanism of Low pressure economizer wet fouling shape

Zhang¹,

Zhang²

2015

Proceedings of the 2015 International Conference on Materials, Environmental and Biological Engineering

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Abstract. Since there has been no feasible way to remove wet flue gas of coal heating surface fouling, modern coal technology forced to raise the temperature of flue gas emissions, keep the flue gas temperature above the dew point of the flue gas acid run, so the flue gas heat abandoned lead a lot of waste. Installation in low pressure economizer cleaning device that can effectively solve the problem of fouling and plugging ash coal flue gas conditions under condensation heating surface, breaking the flue gas acid dew point restrictions on heat utilization. Analysis wet fouling shape generation and migration, and the establishment of wet fouling shape model derived shape description, and then find out the relationship between the thickness of wet fouling and heat transfer coefficient for the study of lower exhaust gas temperature, further use of waste heat is of great significance .

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“…When these loose particulates entrained the silica as a crystalline matrix, the internal microstructure and interface contour of the deposit continuously changed resulting in scale formation [29,30]. After NTP pretreatment, the concentration of silica was reduced.…”

Section: Effect Of Ntp Pre-treatment On the Composition Of The Scalementioning

confidence: 99%

“…Therefore, crystals were irregularly shaped. The silica concentration in the wastewater also decreased and the scale without the silicon matrix became loose [29,30].…”

Section: Effect Of Ntp Pre-treatment On the Scale Morphologymentioning

confidence: 99%