Combustion Characteristics of Single Particles from Bituminous Coal and Pine Sawdust in O2/N2, O2/CO2, and O2/H2O Atmospheres

Lei, Kin Fong; Ye, Buqing; Cao, Jin; Zhang, Rui; Liu, Dong

doi:10.3390/en10111695

Cited by 41 publications

(18 citation statements)

References 31 publications

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“…It was also concluded that the ignition delay time dwindled as the oxygen concentration rose. Lei et al also obtained a similar phenomenon in the single‐particle combustion experiment of bituminous coal and pine sawdust in the DTF. Moreover, when the oxygen concentration increased between 50% and 100%, oxygen had less influence on ignition delay time than low oxygen concentration.…”

Section: Resultsmentioning

confidence: 57%

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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Section: Resultsmentioning

confidence: 57%

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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“…Oxy-fuel (O 2 /CO 2 ) combustion was proposed as a retrofit technology to allow for the capture and storage of CO 2 in new or existing air-fired coal boilers [18][19][20]. Recently, it reached a milestone 35 MW load [21].…”

Section: Introductionmentioning

confidence: 99%

Emission Behaviors of Inorganic Ultrafine Particles during Zhundong Coal Oxy-Fuel Combustion with Characterized Oxygen Input Fractions Comparable to Air Combustion

et al. 2018

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Zhundong low-rank coal is very likely to be utilized extensively in oxy-fired boilers in the near future. Its PM10 (particulate matter with an aerodynamic diameter of ≤10 μm) emission behaviors during oxy-fuel combustion need to be carefully studied before its large-scale use. The present study examines the emission behaviors of inorganic ultrafine particles (PM0.5, with an aerodynamic diameter of ≤0.5 μm), as well as PM10 during the combustion of Zhundong coal in air and oxy-fuel conditions (O2/CO2) at three characterized O2 input fractions, i.e., 21, 27 and 32 vol.%. The combustion experiments were carried out in a high-temperature drop-tube furnace (HDTF) at a combustion temperature of 1500 °C. The results show that PM0.5 is composed of Na, S, Mg and Ca, with total fractions of ~90%, while PM0.5–10 (with an aerodynamic diameter between 0.5 and 10 μm) predominantly contains Ca (~50–65%). At three characterized oxygen fractions during oxy-fuel combustion (OXY21, 27 and 32), the promoted O2 fraction was found to increase the yields of both PM0.5 and PM0.5–10. A higher particle-burning temperature and a lower CO2 fraction promote the reactions of both organically bound elements and inorganic minerals, increasing the partitioning of Mg and Ca and causing an increased yield of PM0.5. The yield of PM0.5 from air is high and similar to that from OXY32 while the yield of PM0.5–10 from air is similar to that from OXY27. The high yield of PM0.5 from air is mainly generated by the highest yields of Ca in four conditions.

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“…The processes of heating, ignition, and combustion are recorded using a video camera. This approach is considered practical and convenient and is often used for studying the combustion behavior of fuels in different conditions [28]. It should be noted that different holders can lead to changes in the heat transfer conditions in a CLF droplet suspended on them, for example, they can increase the heat sink to the holder from the droplet surface or an additional heat flux through the holder to the fuel.…”

Section: Heating Of a Fuel Particle On The Holder In The Flow Of Heatmentioning

confidence: 99%

Ignition of Slurry Fuel Droplets with Different Heating Conditions

2019

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This paper describes modern research methods of the ignition and combustion processes of slurry fuel droplets. The experiments were carried out using a muffle furnace to ensure the conditions of radiation heating, the hot surface to reproduce the conditions of conductive heating, the high-temperature channel with convective heating, the chamber with the processes of soaring, i.e., a significant increase in the time of fuel residence in the combustion chamber. We identified the differences in combustion modes, threshold ignition temperatures, delay times and durations of combustion processes. We obtained the quantitative differences in the characteristics of the ignition and combustion processes for typical registration methods. It was found that for all heating schemes, the minimum ignition temperatures have comparable values. Minimum ignition delay times were recorded during convective heating. The maximum combustion temperatures were achieved with radiation heating. We determined the values of limiting heat fluxes, sufficient to initiate the combustion of slurries fuels during conductive, convective and radiative heating.

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Combustion Characteristics of Single Particles from Bituminous Coal and Pine Sawdust in O2/N2, O2/CO2, and O2/H2O Atmospheres

Cited by 41 publications

References 31 publications

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

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

Emission Behaviors of Inorganic Ultrafine Particles during Zhundong Coal Oxy-Fuel Combustion with Characterized Oxygen Input Fractions Comparable to Air Combustion

Ignition of Slurry Fuel Droplets with Different Heating Conditions

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