The Shape of Pulverized Bituminous Vitrinite Coal                    Particles

Mathews, Jonathan P.; Eser, Semih; Hatcher, Patrick G.; Scaroni, Alan W.

doi:10.14356/kona.2007013

Cited by 20 publications

(6 citation statements)

References 12 publications

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“…A value of 0.43 was used as an intermediate ke for particles between tetrahedral and smooth shapes as done previously [42]. The aspect ratio for flakiness was assumed to be 1 based on 3-D measurements for pulverized bituminous coal dust [49] and the results of Timbrell [50]. Using Equation 2, the volume shape factor was 0.37 as defined by Hinds [41] and indicates that dev should be 11% smaller than dpa.…”

Section: Test Dust Measurements By Ccsemmentioning

confidence: 99%

Calibration of the cloud and aerosol spectrometer for coal dust composition and morphology

Barone

Hesse

Seaman

et al. 2019

Advanced Powder Technology

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Section: Test Dust Measurements By Ccsemmentioning

confidence: 99%

Calibration of the cloud and aerosol spectrometer for coal dust composition and morphology

Barone

Hesse

Seaman

et al. 2019

Advanced Powder Technology

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“…Neither particle temperature, nor size change considerably during the exposure time t exp . By doing a simple heat transfer calculation [33], a characteristic heating time for coal particles can be defined as…”

Section: A Pyrometry Of Moving Objectsmentioning

confidence: 99%

“…For this reason, when quantifying uncertainty caused by shape irregularity, based on [33,43,44], we assumed an average sphericity value of 0.74. The distribution of F p→m was set up for Monte Carlo simulations by computing the already perturbed value that did not contain variation caused by asphericity and multiplying this value by a normally distributed random variable determined by the relative standard deviation obtained in the view factor simulations at the sphericity value of 0.74.…”

Section: B Uncertainty Quantificationmentioning

confidence: 99%

Three-dimensional combined pyrometric sizing and velocimetry of combusting coal particles II: Pyrometry

et al. 2015

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Knowledge of the in situ temperature, size, velocity, and number density of a population of burning coal particles yields insight into the chemical and aerodynamic behavior of a pulverized coal flame (e.g., through means of combustion model validation). Sophisticated and reasonably accurate methods are available for the simultaneous measurement of particle velocity and temperature; however, these methods typically produce single particle measurements in small analyzed volumes and require extensive instrumentation. We present a simple, inexpensive method for the simultaneous, in situ, three-dimensional (3D) measurement of particle velocity, number density, size, and temperature. The proposed method uses a combination of stereo imaging, 3D reconstruction, multicolor pyrometry, and digital image processing techniques. The details of theoretical and algorithmic backgrounds are presented, along with examples and validation experiments. Rigorous uncertainty quantification was performed using numerical simulations to estimate the accuracy of the method and explore how different parameters affect measurement uncertainty. This paper, Part II of two parts that discuss this method [Appl. Opt.54, 4049 (2015)], describes particle temperature and size measurement in overexposed emission images.

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“…The shape distribution investigated above gives a value of 0.825 for isometric particles. However, the values reported in the literature are 0.78 [9] and 0.73 [10], and in [11] it is suggested that if no more accurate information is available, one should use = 0.7. The difference between the two values, 0.825 and 0.7, is probably to be found in irregularities in real particle surfaces as compared with the smooth surfaces of the geometric shapes.…”

Section: Isometric Particlesmentioning

confidence: 99%

Mathematical Model of a Flash Drying Process

Aslaksen¹

2014

Journal of Industrial Mathematics

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The paper presents a basic model of the flash drying process, as it is applied in a number of industrial applications, and illustrates this by means of a particular application: the drying of subbituminous coal. Besides its economic importance, that application is representative of those where the product is combustible, so that the drying needs to be conducted in an inert atmosphere, which is achieved by recycling some of the drying gas. A novel feature of the model is that it takes explicit account of the transport of heat and moisture within the coal particles. The model provides the basis for the development of a tool to support the design of a flash drying plant.

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The Shape of Pulverized Bituminous Vitrinite Coal Particles

Abstract: The shape of pulverized bituminous coal particles (vitrinites)

Cited by 20 publications

References 12 publications

Calibration of the cloud and aerosol spectrometer for coal dust composition and morphology

Calibration of the cloud and aerosol spectrometer for coal dust composition and morphology

Three-dimensional combined pyrometric sizing and velocimetry of combusting coal particles II: Pyrometry

Mathematical Model of a Flash Drying Process

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