A six-parameter model to predict ash formation in a CFB boiler

Yang, Hairui; Wirsum, Manfred; Guangxi, Yue; Fett, F.N.; YouNing, Xu

doi:10.1016/s0032-5910(03)00137-2

Cited by 7 publications

(4 citation statements)

References 1 publication

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“…3c). The Rosin-Rammler (R-R) equation, which is used to describe the particle size distribution of crushed brittle powders [23,24], is as follows:…”

Section: Sample Preparationmentioning

confidence: 99%

Experimental investigation of the fire extinguishing capability of ferrocene-containing water mist

Koshiba

Okazaki

Ohtani

2016

Fire Safety Journal

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This study focuses on the fire-suppression capabilities and corrosive properties of ferrocene dispersions. The motivation behind the present study was to develop a high-performance, phosphorus-free fire suppressant. Aqueous dispersions containing micron-sized ferrocene particles and surfactants were prepared using sonication techniques. In this study, Triton X-100 (TX), Noigen TDS-80 (NT), Tween 60 (T60), and Tween 80 (T80) were used as surfactants. Suppression experiments involving pool fires clearly indicated that aqueous ferrocene dispersions containing TX and micron-sized ferrocene with a d50 = 16.9 micron exhibit shorter extinguishing times than a conventional wet chemical. Corrosion trials using steel plates immersed in ferrocene dispersions containing TX confirmed that there was no pitting corrosion, implying that ferrocene dispersions containing TX do not present a corrosion risk.

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“…3c). The Rosin-Rammler (R-R) equation, which is used to describe the particle size distribution of crushed brittle powders [23,24], is as follows:…”

Section: Sample Preparationmentioning

confidence: 99%

Experimental investigation of the fire extinguishing capability of ferrocene-containing water mist

Koshiba

Okazaki

Ohtani

2016

Fire Safety Journal

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“…This process is caused and accompanied by complex chemical processes, 1 heat and mass transfer, and thermoelastic phenomena in porous material of the fuel. 2 The primary fragmentation in the fluidized bed (FB) reactors affects the fuel distribution along the furnace height, 3 ash particles granulation, 4 carbon content in the fly ash, 5 and sulfur capture. 6 The general indicators of the process, as introduced by Zhang et al, 7 are the primary fragmentation intensity (N f ), the changing ratio of fuel size (F d ), and the primary fragmentation index (S f ).…”

Section: ■ Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of the Primary Fragmentation of a Lignite during Fluidized-Bed (FB) Devolatilization

et al. 2015

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The paper presents a comparison between experimental and model results of primary fragmentation of a lignite coal in a fluidized bed (FB). In the experiments, the char particle size distribution and the general indicators of primary fragmentation (intensity and index) were determined. The same parameters were calculated using a mathematical model of the process, fed by data of the fuel (the amount of volatiles and fixed carbon), fluidized bed temperature, and inlet particle size distribution. The size distribution and number of the char particles in fluidized bed significantly differ from the size distribution and number of inlet coal particles. Char population has a bimodal distributionseparate distributions for the smaller and larger sets of fragments. The experimental and model results show the same tendency: a coal particle partially breaks at the beginning of devolatilization, giving a large number of fine fragments, while, as the process continues, the rest of the parent particle sometimes breaks down into a smaller number of larger pieces, and sometimes does not fragment at all. Review of the Weibull distribution coefficients enables prediction of the char particle size distribution for the characteristic fluidized bed conditions and inlet coal particle sizes.

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“…Together with the attrition, the primary fragmentation influences the ash particle size distribution, which is significant in determination of the design parameters of a CFB boiler, especially for the boilers where coal ash is used as the fluidizing bed material instead of sand …”

Section: Introductionmentioning

confidence: 99%

“…9 This is emphasized for cocombustion systems burning coal and biomass. 10 Together with the attrition, the primary fragmentation influences the ash particle size distribution, 11 which is significant in determination of the design parameters of a CFB boiler, 12 especially for the boilers where coal ash is used as the fluidizing bed material instead of sand. 13 Two phenomena have been reported as the causes for the primary fragmentation of coal: rapid change of the temperature and the formation of volatiles within the particle.…”

Section: ■ Introductionmentioning

confidence: 99%

Prediction of Coal Primary Fragmentation and Char Particle Size Distribution in Fluidized Bed

et al. 2013

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The combination of temperature gradient and volatile release has been identified as the main cause for primary fragmentation (breakage of fuel particles during devolatilization). A mathematical model of the primary fragmentation in a fluidized bed has been developed, incorporating both causes. It takes into account the type of the coal, size of the coal particles, and the fluidized bed temperature. The model simulates fragmentation of a batch of coal particles. For each particle in the batch, the model follows propagation and merging of cracks, starting from randomly distributed pre-existing pores, leading to possible breakage of the particle. The model calculates volume of the fragmented particles and volume diameters, classifying them into size classes. For each size class, the number of particles is counted, and the mass fraction is calculated. The results are the distribution of mass and number of char particles after the devolatilization and the primary fragmentation parameters.

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A six-parameter model to predict ash formation in a CFB boiler

Cited by 7 publications

References 1 publication

Experimental investigation of the fire extinguishing capability of ferrocene-containing water mist

Experimental investigation of the fire extinguishing capability of ferrocene-containing water mist

Experimental and Numerical Investigation of the Primary Fragmentation of a Lignite during Fluidized-Bed (FB) Devolatilization

Prediction of Coal Primary Fragmentation and Char Particle Size Distribution in Fluidized Bed

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