Simulation of pulverised coal test furnace performance

Lockwood, F.C.; Mahmud, Tariq; Yehia, Mohamed

doi:10.1016/s0016-2361(97)00294-9

Cited by 53 publications

(14 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2 shows the ratio b/a, i.e. the ratio of the CO flame sheet radius in the boundary layer of a particle to the particle radius, for different particle diameters, and the corresponding values of the energy distribution Table 1 Dimension of combustion chamber [6,18] Fig. 2, it can be observed that, depending upon the particle diameter, when the particle temperature is below a certain value, CO burns on the particle surface, that is b/a = 1, and the corresponding value of the energy distribution coefficient is X c = 1.0.…”

Section: Resultsmentioning

confidence: 99%

“…This phenomenon cannot be understood or predicted by the traditional single film with CO the only reaction product (SF-CO) model. However, because of the complexity of treating the highly nonlinear heat release and mass transfer coupling, the SF-CO model is still widely used in the numerical simulation of pulverized coal combustion [4][5][6]. In the SF-CO model, it is supposed that there is no further change in the primary combustion product, CO, in the boundary layer of the particle, thus the fraction of the total heat of char combustion released on or near the particle surface, termed in the present work the ''energy distribution coefficient", X c , takes the value of 0.3, approximately [4,7].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical study on the spatial distribution of energy release during char combustion

Zhang

et al. 2008

Applied Energy

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical study on the spatial distribution of energy release during char combustion

Zhang

et al. 2008

Applied Energy

View full text Add to dashboard Cite

“…Considering the reliability of the models and the feasibility of project application, standard k-two-equation model [6,7,8] was used for the simulation of gas phase turbulence flow, two fluid model based on Inter-phase Slip Algorithm (IPSA) [9] for gas-solid two-phase flow, and six-flux model for radiation.…”

Section: B Mathematics Models Identifymentioning

confidence: 99%

The Research of the Influence of Primary Air Ratio on the Combustion in a Lignite-Fired Ultra Supercritical Boiler

Sha

Liu

Feng

et al. 2009

2009 Asia-Pacific Power and Energy Engineering Conference

View full text Add to dashboard Cite

The Computational Fluid Dynamics (CFD) code PHOENICS was applied to evaluate the combustion process in the furnace of a 1000MW dual circle tangential firing single furnace lignite-fired Ultra Supercritical (USC) boiler. The influence of different primary air ratios (35%, 39% and 43%) on the flow and mixing characteristics of the gas-solid two-phase flow and the combustion process in the furnace was focused on. The results indicate that in the furnace with double tangential firing, the flow field shows two well-symmetrical ellipses at different primary air ratios. The surface temperatures of the burners at which, the long axis of the ellipses pointed, are much higher than those in the other four corners. Thus the phenomena of 'Hot corners' and 'Cold corners' arise. In practical operating, the flow erodes the walls in the hot corner which may lead to high temperature corrosion and slagging. With the increase of primary air ratio, the average concentration of NO x at the outlet of furnace rises while the char distributions in the furnace are similar. By the comparisons of the characteristics of the airflow, the temperature distributions, the NO x formation amounts and the char burnout rates, the situation with the 35% primary air ratio is preferable. The results of this paper have great value because of the support they lend to the design of USC lignite-fired boilers.

show abstract

“…The coal combustion properties in dilute particle regions, where the coal particle behaves independently, have been extensively studied by experimental and numerical methods [1,2]. In practical applications, the global or local particle concentration in a combustor is generally high, therefore the particle interaction has significant impacts on the combustion process.…”

Section: Introductionmentioning

confidence: 99%