Experimental investigation on coal devolatilization at high temperatures with different heating rates

Yan, Binhang; Cao, Chenxi; Cheng, Yan; Ye, Jin; Cheng, Yi

doi:10.1016/j.fuel.2013.08.016

Cited by 59 publications

(23 citation statements)

References 28 publications

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“…Experiments suggest that as heating rate increases, the temperature at which devolatilization happens increases [15,59,60]. As the heating rate increases, the ultimate yield, or final volatiles fraction after devolatilization, also increases [61,62].…”

Section: Approachmentioning

confidence: 99%

A comparison of simple global kinetic models for coal devolatilization with the CPD model

Richards

Fletcher

2016

Fuel

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Simulations of coal combustors and gasifiers generally cannot incorporate the complexities of advanced pyrolysis models, and hence there is interest in evaluating simpler models over ranges of temperature and heating rate that are applicable to the furnace of interest. In this paper, six different simple model forms are compared to predictions made by the Chemical Percolation Devolatilization (CPD) model. The model forms included three modified one-step models, a simple two-step model, and two new modified two-step models. These simple model forms were compared over a wide range of heating rates (5  10 3 K/s to 10 6 K/s) at final temperatures up to 1600 K. Comparisons were made of total volatiles yield as a function of temperature, as well as the ultimate volatiles yield.Advantages and disadvantages for each simple model form are discussed. A modified two-step model with distributed activation energies seems to give the best agreement with CPD model predictions (with the fewest tunable parameters).

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Section: Approachmentioning

confidence: 99%

A comparison of simple global kinetic models for coal devolatilization with the CPD model

Richards

Fletcher

2016

Fuel

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“…Early in 1977, the high-temperature devolatilization of coals has been studied under rapid heating conditions was studied by Kobayashi et al, who found that the volatile yields increased significantly with high temperatures, and the high temperature volatile matters (HTVM) yields noticeably exceeded the standard volatile content that is given by standard proximate analysis, and thus, an empirical model of two-competing overall reactions was proposed for accurate prediction of HTVM yields [12,13]. Later, a number of experimental studies on high temperature-rapid coal devolatilization were performed focusing on the yields of gaseous products and tar; the effects of particle size, oxygen coefficient and pressures; and model development [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

High-temperature rapid devolatilization of biomasses with varying degrees of torrefaction

Li¹,

Bonvicini²,

Tognotti³

et al. 2014

Fuel

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Torrefied biomass is a coal-like fuel that can be burned in biomass boilers or co-fired with coal in co-firing furnaces. To make quantitative predictions regarding combustion behavior, devolatilization should be accurately described. In this work, the devolatilization of three torrefied biomasses and their parent material were tested in an isothermal plug flow reactor, which is able to rapidly heat the biomass particles to a maximum temperature of 1400 C at a rate of 104 C/s, similar to the conditions in actual power plant furnaces. During every devolatilization test, the devolatilized biomass particles were collected and analyzed to determine the weight loss based on the ash tracer method. According to the experimental results, it can be concluded that biomass decreases its reactivity after torrefaction, and the deeper of torrefaction conducted, the lower the biomass reactivity. Furthermore, based on a two-competing-step model, the kinetic parameters were determined by minimizing the difference between the modeled and experimental results based on the least-squares objective function, and the predicted weight losses exhibited a good agreement with experimental data from biomass devolatilization, especially at high temperatures. It was also detected that CO and H2 are the primary components of the released volatile matters from the devolatilization of the three torrefied biomasses, in which CO accounts for approximately 45-60%, and H2 accounts for 20-30% of the total volatile species. © 2014 Elsevier Ltd. All rights reserved

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“…The ANSYS FLUENT software makes it possible to take into consideration the difference in the total amount of volatile matter in fuel (accounting for the high-temperature output of volatile matter, exceeding by K times the value of a standard analysis). It is accepted that, for anthracite, K=2.4, for bituminous coal, K=1 [10]. The kinetic coal constants for use in the software are determined by comparing particle combustion rates in line with models reported in [11,12].…”

Section: Approaches To Modeling the Combustion Of Mixtures In The Ansmentioning

confidence: 99%

On using the ANSYS FLUENT software for calculating the process of burning a mixture of particles from different types of solid fuels

Nekhamin

Beztsennyi

Dunayevska

et al. 2020

EEJET

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Experimental investigation on coal devolatilization at high temperatures with different heating rates

Cited by 59 publications

References 28 publications

A comparison of simple global kinetic models for coal devolatilization with the CPD model

A comparison of simple global kinetic models for coal devolatilization with the CPD model

High-temperature rapid devolatilization of biomasses with varying degrees of torrefaction

On using the ANSYS FLUENT software for calculating the process of burning a mixture of particles from different types of solid fuels

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