The ignition characteristics and combustion processes of the single coal slime particle under different hot-coflow conditions in N2/O2 atmosphere

Zhou, Kun; Lin, Qizhao; Hu, Hai; Hu, Huiqing; Song, Liubin

doi:10.1016/j.energy.2016.02.038

Cited by 59 publications

(17 citation statements)

References 32 publications

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“…In this work, the internal ignition temperature of biomass pellets was also measured and recorded. Although there is a certain temperature gradient with the particle surface, their temperature change trend is similar as reported in refs [39][40][41][42] who confirmed this phenomenon. The value of internal ignition temperature was obtained according to figure 9.…”

Section: Tga Analysissupporting

confidence: 86%

Investigation of combustion and emissions of mixture of a wheat dust with binder pellet in a fixed-bed combustor

El‐Sayed¹,

El-Sayed²

2018

IJHT

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The combustion behavior and gaseous emissions of wheat dust pellet at various operating parameters such as air temperature, pellet size, and air velocity are evaluated to achieve a better combustion performance. The results showed that as air temperature and air velocity increase as well as pellet size decreases, ignition time, char time, time to reach maximum temperature decreases and total combustion rate increases. It was concluded from the results that, a hexagonal pellet is the best shape for combustion under the investigated conditions and parameters due to its lowest ignition temperature, lowest surface temperature, shortest ignition time, and longest time required for combustion. CO2 content reaches its maximum value at air temperature 400 0 C for all pellets. The maximum CO concentration occurs at the highest diameter of the pellet. The combustion efficiency ranged between 99% to 100%. The wheat dust pellet has a medium slagging tendency (slagging index=0.72) and a relatively high fouling inclination (fouling index=1.88). The activation energy of a wheat dust pellet and a binder is 102.05 and 109.62kJmol-1 , respectively, using TG data and kinetics model. The ignition time, the maximum combustion rate time and the burnt temperature of epoxy 1092 are lower than that of the pellet.

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Section: Tga Analysissupporting

confidence: 86%

Investigation of combustion and emissions of mixture of a wheat dust with binder pellet in a fixed-bed combustor

El‐Sayed¹,

El-Sayed²

2018

IJHT

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“…The ignition phenomenon can be observed via the captured video. The ignition mode of solid fuel was affected by the fuel's own characteristics and external operating conditions . Diverse ignition phenomena of biomass pellets were found in different test conditions.…”

Section: Resultsmentioning

confidence: 99%

“…Diverse ignition phenomena of biomass pellets were found in different test conditions. According to previous studies, the ignition mode was generally divided into three types: hetero‐homogeneous ignition of volatiles and char simultaneously, heterogeneous ignition of solid char, and homogeneous ignition of gaseous volatiles. Homogeneous ignition means that the volatiles released by the pellets is ignited first, and then the char is ignited.…”

Section: Resultsmentioning

confidence: 99%

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An experimental study of single unconventional biomass pellets: Ignition characteristics, combustion processes, and artificial neural network modeling

Lin

Wang

et al. 2020

Int J Energy Res

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Summary This study applied the artificial neural networks (ANNs) model to the thermal data obtained by suspension ignition and combustion experiment of single peanut shells (PS, millimeter scale) pellet under O2/CO2 atmosphere. ANN11 was the best ANN model for predicting the relevant parameters of PS combustion. The coincidence between ANN prediction data and experimental data was over 99%. Two modes of biomass pellet ignition were observed: homogeneous ignition of volatiles and hetero‐homogeneous ignition of volatiles and char simultaneously. The ignition mode was transformed from homogeneous ignition to hetero‐homogeneous ignition when oxygen concentration was 50%. In addition, it was observed that ignition at the bottom emerged first, and then the upper end was ignited, finally generating an envelope flame. This phenomenon occurred when gas flow temperature exceeded 873 K or the oxygen concentration was greater than 50%. The reduction of ignition delay time and internal ignition temperature from 21% to 50% oxygen concentration was more intense than that of 50% to 100% oxygen concentration. Increasing oxygen concentration or temperature resulted in a shorter, brighter, and more stable volatile flame of biomass pellets, which reduced volatile burnout time. Nevertheless, the impact of gas flow rate on biomass combustion was intricate and irregular.

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“…It is therefore desired to develop more effective technology for gangue utilization. The pollution of slime is higher than that of gangue due to its small particle size and chemical properties [8][9][10]. At the same time, the low calori c value and high ash content make the reuse of coal slime to be di cult.…”

Section: Introductionmentioning

confidence: 99%

Effect of Waste Glass Powder on Phase, Microstructure and Mechanical Properties of Mullite Based Porous Ceramics with Coal-series Solid Waste as Raw Materials

Lian¹,

Liu²,

Wang³

et al. 2020

Preprint

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Mullite based porous ceramics were successfully prepared by using a solid-phase method with gangue, slime and sawdust as raw materials. The effects of the content of glass powder and calcining temperature on microstructure and mechanical properties of the samples were systematically studied. It is found that glass powder can prevent the formation of Kyanite and reduce the synthesis temperature of mullite. The samples with 4% glass powder have a large amount of mullite calcined at 1150°C for 3h. Meanwhile, alumina in the sample is completely converted into mullite at 1180°C for 3h. Mullite content reaches 64.2wt%. The minimum apparent porosity is 31.22%, while the maximum volume density and diameter shrinkage are 1.74g/cm 3 and 8.48%, respectively. The ratio of pores of <8μm to those of 8~20μm is varied from 7:2 to 2:7, due to the addition of the glass powder. With increasing content of mullite, the flexural properties of the samples are increased from 7.7MPa to 28.36MPa. Therefore, with solid wastes as the resource, the porous ceramics have a bright prospect.

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The ignition characteristics and combustion processes of the single coal slime particle under different hot-coflow conditions in N2/O2 atmosphere

Cited by 59 publications

References 32 publications

Investigation of combustion and emissions of mixture of a wheat dust with binder pellet in a fixed-bed combustor

Investigation of combustion and emissions of mixture of a wheat dust with binder pellet in a fixed-bed combustor

An experimental study of single unconventional biomass pellets: Ignition characteristics, combustion processes, and artificial neural network modeling

Effect of Waste Glass Powder on Phase, Microstructure and Mechanical Properties of Mullite Based Porous Ceramics with Coal-series Solid Waste as Raw Materials

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