One-Dimensional Model for Pulverized Coal Combustion and Gasification

Smith, Phillip J.; Smoot, L.D.

doi:10.1080/00102208008952393

Cited by 46 publications

(27 citation statements)

References 13 publications

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“…Smith and Smoot, 1980). Typical correlations used are taken directly from heat transfer texts such as Kreith (1973) or from previous correlations developed for liquid droplets in convective flow (Ranz and Marshall, 1952).…”

Section: Introductionmentioning

confidence: 99%

Heat and mass transfer coefficients for porous horizontal cylinders

Nomura

Farrell

1985

AIChE Journal

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Section: Introductionmentioning

confidence: 99%

Heat and mass transfer coefficients for porous horizontal cylinders

Nomura

Farrell

1985

AIChE Journal

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“…Thc pulvcrizcd coal and combustion air i n the primary flow are considered to be wcll-rnixcd, and in dynamic equilibrium (i.e., n o net relative velocity). Smith and Smoot (1980) have reported that good agreement bctwccn rncasurcmcnts and predictions can be obtained i f the expcrimental combustor has a ncar oncdimensional configuration. F o r gcomctrics where agreement was good, the mixing o f primary and sccondary gascs occurrcd rapidly whilc coal particle ignition occurrcd later i n a fully-mixed region o f the combustor, For the high-intensity combustion cases studied herein, particle ignition occurs before the mixing is complctc.…”

Section: Reactor Geometrymentioning

confidence: 89%

“…The assumptions involved in the coal combustion model of I-DICOG have been reported by Smith and Smoot (1980). The virgin coal undergoes devolatilization to volatiles and char by two competing overall reactions presented by Kobayashi el a/.…”

Section: Coal Devolafilizafion and Char Oxidationmentioning

confidence: 99%

“…The detailed model formulation of I-DICOG was given by Smith and Smoot (1980). A description of energy, momentum and mass balance considerations with their appropriate boundary conditions can be found in that source.…”

Section: Model Applicationmentioning

confidence: 99%

“…(1983) have recently presented a flame sheet model, analogous to the single droplet combustion model, for short residence time combustion of coal. A one-dimensional model for pulverized coal combustion and gasification (I-DICOG) was previously reported by Smith and Smoot (1980). However, application of these models to high-intensity coal combustion has been very limited.…”

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Prediction of High-Intensity Pulverized Coal Combustion

Suzuki

Smoot

Fletcher

et al. 1986

Combustion Science and Technology

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The overall characteristics o f high-intensity pulverized coal combustion have been predicted by a one-dimensional model. The mixing o f the primary stream o f pulverized coal and transport air with secondary combustion air was estimated by a growth angle o f the primary jet. The coal particle burnout was strongly affected by the extent o f devolatilization, which varies among coals. The extent o f devolatilization as characterized by variation in a devolatilization coefficient was correlated with either proximate volatiles percentage or H / C mass ratio of the virgin coal. The resulting comparisons or predictions with measurements for eight coal types and three different combustors show that observed trends are generally predicted. The data used Tor these comparisons were obtained from a wide range o f high-intensity combustion experiments. The proximate volatile matter in the virgin test coals ranged from I 6 to 40 perccnt while the coal feed rate was varied from 12 to 290 kglhr. Combustion air temperature varied from 297 to 1483 K while residence time ranged from 3 to 140 ms. Comparative results suggest that the predictive method can be useful i n interpreting high intensity combustion test results.

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Modeling Moving and Fixed Bed Combustion

Peters

Raupenstrauch

2010

Handbook of Combustion

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Owing to declining sources of primary energy and a demand for sustainability, solid fuels and their use for generation of energy have gained a growing attraction during recent years. In particular, biomass is considered as an alternative source because it contributes to reduced net emissions of carbon dioxide. To understand the conversion behavior of solid fuels, both experimental and theoretical investigations were initiated. This chapter deals with the modeling aspect of solid fuel combustion in fixed and moving beds. The conversion of both a fixed and moving bed is a rather complex process involving various thermodynamic, fluid dynamic, physical, and chemical aspects and their interactions. Thus, the relevance of each aspect will be described within this chapter and moreover their dependence on each other. Major processes during solid fuel combustion include, in general, heating, drying, pyrolysis, devolatilization, gasification and perhaps combustion. These processes of thermal conversion involve chemical reaction processes that consume or generate energy. In moving beds, the redistribution of the solid fuel particles has to be taken into account additionally. All these aspects may be represented by models of different levels of accuracy, whereby the models may be divided into the continuum mechanics and the discrete approach. The first approach treats solid fuel as a continuum for which characteristics such as size or shape disappear due to the averaging process. However, the discrete approach takes all these characteristics into account on a particle level, and therefore, offers a priori a higher degree of accuracy.

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One-Dimensional Model for Pulverized Coal Combustion and Gasification

Cited by 46 publications

References 13 publications

Heat and mass transfer coefficients for porous horizontal cylinders

Heat and mass transfer coefficients for porous horizontal cylinders

Prediction of High-Intensity Pulverized Coal Combustion

Modeling Moving and Fixed Bed Combustion

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