On the burning behavior of pulverized coal chars

Mitchell, Reginald E.; Ma, Liqiang; Kim, BumJick

doi:10.1016/j.combustflame.2007.07.014

Cited by 102 publications

(48 citation statements)

References 19 publications

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“…It is particularly useful when one is not interested in simulating the radiation from the full particle cloud but instead want focus on a single particle that represent all the other particles in the sub volume. Examples of such simulations are found in Qiao et al [4] and Mitchell et al [6].…”

Section: Resultsmentioning

confidence: 99%

“…This is the case in the work of e.g. Qiao et al [4] and Mitchell et al [6]. The proposed radiative cooling term will also be applicable when Direct Numerical Simulations (DNS) are being used to simulate a very small sub domain of a real application 1 .…”

Section: Particle In the Center Of The Enclosurementioning

confidence: 90%

“…If, on the other hand, one does not perform a full CFD simulation but is rather interested in solving single particle physics and chemistry in high detail one often neglects, or partly neglects, radiation. In such cases radiation may not be considered at all, or if it is taken into account, only particle-wall radiation [4,5,6] or particle-fluid radiation [7] is considered. The primary aim of this paper is to obtain a realistic description for the particle radiation transfer, including both particle-to-wall and particle-to-particle radiation, that can be used for high detail particle simulations.…”

mentioning

confidence: 99%

“…Traditionally, the particle cooling term used for such single particle simulations of a cloud of particles has been given by [4,6] …”

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confidence: 99%

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Modeling radiation in particle clouds: on the importance of inter-particle radiation for pulverized solid fuel combustion

Haugen

Mitchell

2014

Heat Mass Transfer

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The importance of inter-particle radiation for clusters of gray and diffuse particles is investigated. The radiative cooling of each individual particle is found to vary strongly with its position in the cluster, and a "mean" radiative particle cooling term is proposed for single particle simulations of particle clusters or for high detail simulation, like Direct Numerical Simulations of small sub-volumes of large clusters of particles. Radiative cooling is shown to be important both for furnaces for coal gasification and coal combustion. Broadening the particle size distribution is found to have just a minor effect on the radiative particle cooling. This is particularly the case for large and dense particle clusters where there is essentially no effect of size distribution broadening at all. For smaller and more dilute particle clusters, the effect of distribution broadening is clear but still not dominant.

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Section: Resultsmentioning

confidence: 99%

Section: Particle In the Center Of The Enclosurementioning

confidence: 90%

mentioning

confidence: 99%

“…Traditionally, the particle cooling term used for such single particle simulations of a cloud of particles has been given by [4,6] …”

mentioning

confidence: 99%

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Modeling radiation in particle clouds: on the importance of inter-particle radiation for pulverized solid fuel combustion

Haugen

Mitchell

2014

Heat Mass Transfer

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“…As examples, an integrated gasification combined cycle system [2][3][4] and super-critical pulverized coal combustion [5] are receiving a great deal of attention. However, the implementation and applicability of such emerging technologies to commercial systems requires an understanding of the combustion and gasification characteristics of coal [6]. A thorough understanding of such coal reaction processes could be gained through experimental study with either a laboratory-scale reactor or a pilot-scale boiler, both of which would require a specific facility and installation costs.…”

Section: Introductionmentioning

confidence: 99%

Examination of flame length for burning pulverized coal in laminar flow reactor

Kim

Chang

et al. 2010

J Mech Sci Technol

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Because there has been a recent increase in the use of low calorific coal compared to standard coal, it is crucial to control the char flame length governing the burning life-time of coal in a coal-fired utility boiler. The main objective of this study is to develop a simplified model that can theoretically predict the flame length for burning coal in a laboratory-scale entrained laminar flow reactor (LFR) system. The char burning behavior was experimentally observed when sub-bituminous pulverized coal was fed into the LFR under burning conditions similar to those in a real boiler: a heating rate of 1000 K/s, an oxygen molar fraction of 7.7 %, and reacting flue gas temperatures ranging from 1500 to 2000 K. By using the theoretical model developed in this study, the effect of particle size on the coal flame length was exclusively addressed. In this model, the effect of particle mass was eliminated to compare with the experimental result performed under a constant mass feeding of coal. Overall, the computed results for the coal flame length were in good agreement with the experimental data, particularly when the external oxygen diffusion effect was considered in the model.

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Historical Perspective on Identifying and Controlling Spontaneous Combustion

Wang

2019

Spontaneous Combustion of Coal

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On the burning behavior of pulverized coal chars

Cited by 102 publications

References 19 publications

Modeling radiation in particle clouds: on the importance of inter-particle radiation for pulverized solid fuel combustion

Modeling radiation in particle clouds: on the importance of inter-particle radiation for pulverized solid fuel combustion

Examination of flame length for burning pulverized coal in laminar flow reactor

Historical Perspective on Identifying and Controlling Spontaneous Combustion

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