Numerical prediction of unburned carbon levels in large pulverized coal utility boilers

Pallarés, Javier; Arauzo, Inmaculada; Díez, Luis I.

doi:10.1016/j.fuel.2005.05.011

Cited by 37 publications

(20 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

Section: Cfd Modeling and Experimental Studymentioning

confidence: 99%

The Effect of Temperature Distribution on Tube Rupture

Aydin

Durak

2012

JTST

View full text Add to dashboard Cite

show abstract

“…Site operation data was used to verify NO x predictions. Pallares et al [9] simulated a front fired boiler. The work concentrated on char burnout predictions.…”

Section: Introductionmentioning

confidence: 99%

“…A tool being able to measure not only the average value but also the temperature distribution is needed for a comprehensive CFD model validation. The aggressive environment of high temperatures and ash particles in addition to large dimensions of the furnace make temperature measurement a complex task [9]. Traditionally used suction pyrometry is extremely accurate.…”

Section: Introductionmentioning

confidence: 99%

A validation of computational fluid dynamics temperature distribution prediction in a pulverized coal boiler with acoustic temperature measurement

Modliński

Madejski²,

Janda³

et al. 2015

Energy

View full text Add to dashboard Cite

“…For example, ignition behaviors prediction [5], large percentage of biomass utility [6], combustion characters and NO x emissions [7][8][9][10][11], unburned carbon level [12] and ash deposition characters [13]. It is well known that the velocity vectors of combustion air when injected into furnace are important to the turbulence flow inside whole combustion chamber, which will affect the reactions rates at high temperature conditions.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Loads Effect on Combustion Performance and NOx Emissions of a 220 MW Pulverized Coal Boiler

Jun

Jankowski²,

Kotecki³

et al. 2012

Cleaner Combustion and Sustainable World

View full text Add to dashboard Cite

This paper presents numerical study on the combustion performance and NO x emissions of a 220 MW pulverized coal boiler. Three different loads have been simulated with combusting coal, 200, 170 and 140 MW, respectively. In order to get as precise as possible numerical analysis results, two-step simulation method has been adopted in this work, namely, air supply system simulation and furnace simulation. After air supply system simulation, the results have been taken as the initial and boundary conditions for furnace simulation. The comparison between the measured values and predicted results from 200 MW case shows much better agreement. According to the simulation results, the adopted two-step simulation method is reasonable and suitable for predicting the characters of the flow and combustion process. It is concluded that the distributions of temperature, O 2 and CO concentration inside furnace with different loads shows good similarly. The total NO x emissions decreased with the boiler load reducing, and fuel NO x has the same trend as total NO x , and fuel NO x account for about 66% in total NO x in all the three cases. More important, thermal NO x slowly decreased with the rise of boiler load. More detailed results presented in this paper enhance the understanding of combustion processes and complex flow patterns of front-wall pulverized coal boilers.

show abstract

Numerical prediction of unburned carbon levels in large pulverized coal utility boilers

Cited by 37 publications

References 15 publications

The Effect of Temperature Distribution on Tube Rupture

The Effect of Temperature Distribution on Tube Rupture

A validation of computational fluid dynamics temperature distribution prediction in a pulverized coal boiler with acoustic temperature measurement

Numerical Analysis of Loads Effect on Combustion Performance and NOx Emissions of a 220 MW Pulverized Coal Boiler

Contact Info

Product

Resources

About