Particle temperature and flue gas emission of a burning single pellet in air and oxy-fuel combustion

Mock, Chinsung; Park, Hyemin; Ryu, Changkook; Manović, Vasilije; Choi, Se-Weon

doi:10.1016/j.combustflame.2019.11.034

Cited by 31 publications

(7 citation statements)

References 28 publications

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“…The composition and amount of ash produced depend on the properties of the biomass and the combustion conditions. This phenomenon is supported by Mock (2020) [12], who studied single pine wood and empty fruit bunch pellets biomass pelletization and found that the process increases the pellet bulk energy density and uniformity and can be burned in industrial furnaces. In addition, their experimental study examined the combustion behavior of single pine wood and empty fruit bunch pellets in a laboratory-scale entrained-flow reactor.…”

Section: Ash Contentmentioning

confidence: 76%

“…Therefore, decreasing the volatile matter composition is a favorable advancement for utilizing these solid fuels within a pre-existing coal-fired facility. In addition, according to [12], the volatile matter content or their physical and chemical differences may be the reason for the quicker ignition. Thus, it is a crucial fuel pellet quality to look into.…”

Section: Volatile Mattermentioning

confidence: 99%

“…Following that, in another journal, ref. [12] stated that after the biomass was combusted, all that was left was ash, where the fixed carbon was gone, and there had been no reaction.…”

Section: Fixed Carbonmentioning

confidence: 99%

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Biomass Fuel Characteristics of Malaysian Khaya senegalensis Wood-Derived Energy Pellets: Effects of Densification at Varied Processing Temperatures

Ismail,

Khor,

Mohamed

2024

JMMP

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This study addresses the effects of densification at varied pelletization temperatures on the novel Malaysian Khaya senegalensis wood-derived pellets biomass fuel characteristics. The lack of comprehensive understanding regarding the biomass fuel characteristics of this species prompted the research. By addressing this knowledge gap, this study explores the impact of temperature variations on key fuel properties, contributing to the optimization of sustainable biomass fuel production in manufacturing and materials processing. Khaya senegalensis wood, grown and harvested in Malaysia, was pelletized at different temperatures to analyze the calorific value, volatile matter content, ash content, fixed carbon, bulk density, and moisture contents of the pellets. The experimental data revealed a significant relationship between temperature and these fuel properties. Pelletizing at 75 °C produced the highest calorific value of 19.47 MJ/kg and the maximum fixed carbon content of 10.04%. A low ash level of 4.26% was achieved via pelletizing at 75 °C. According to the results, 75 °C produced the best thermophysical properties. These findings provide valuable understanding of how pelletization temperature influences fuel pellet thermophysical properties, a critical aspect in optimizing fuel pellet production, storage, advancing renewable energy resource utilization, and, finally, promoting a cleaner and more sustainable energy future.

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Section: Ash Contentmentioning

confidence: 76%

Section: Volatile Mattermentioning

confidence: 99%

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Biomass Fuel Characteristics of Malaysian Khaya senegalensis Wood-Derived Energy Pellets: Effects of Densification at Varied Processing Temperatures

Ismail,

Khor,

Mohamed

2024

JMMP

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“…Zhang et al 24 reported that the fluctuation in the gas temperature significantly affects the instantaneous reaction of carbon in the biomass particles. Mock et al 25 observed that torrefied (carbonized) biomass has different ignition delay times and flame structures compared to nontorrefied biomass. Wang et al 26 observed that the ignition delay time of biomass particles was closely related to the moisture content of the particles.…”

Section: Introductionmentioning

confidence: 99%

Visualization of Combustion Phases of Biomass Particles: Effects of Fuel Properties

Jia

Wang

et al. 2021

ACS Omega

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This work established a high-speed camera-assisted visualization system that investigated the effect of volatile matter and fixed carbon content in biomass particles on single-particle combustion phases and their luminous properties. Three types of biomass particles, namely, sawdust (a mixture of pine and willow), corncob, and rice husk, were examined on a Hencken flat-flame burner. The luminous region and intensity of single biomass particles were closely related to the flammability and calorific value of biomass fuel and derived by analyzing a sequence of images captured using a high-speed camera. The combustion temperature was determined through analysis of its radiant energy. The results showed that the ignition mechanisms of volatile matter and fixed carbon corresponded to homogeneous and heterogeneous reactions, respectively. The maximum luminous region values of 1.75 × 10 6 , 2.1 × 10 6 , and 1.0 × 10 6 μm 2 for sawdust (SD), corncob (CC), and rice husk (RH) correlated to the volatile matter content of each biomass sample, which was 69.38, 74.15, and 64.56%, respectively. Because of the high fixed carbon content, the peak temperature of the SD particles could reach 1549 °C. The luminous region and intensity of the combusting particles were significantly affected by the volatile matter and fixed carbon, respectively.

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“…For example, rapid devolatilization and burning of volatiles cannot be determined. Consequently, several studies have used laboratory‐scale systems with high‐temperature surroundings (heating rate as high as 10 4 K/s), such as a drop‐tube furnace 15,16 or hot‐flow reactor 17,18 to investigate the combustion process and bridge this knowledge gap. Bi et al 19 observed that hetero‐homogeneous ignition of a single peanut shell pellet occurred when the oxygen concentration exceeded 50% in O 2 /CO 2 surroundings at flow temperatures greater than 873 K. Huan et al 20 reported that 50% of miscanthus biochar blended with coal pellet enhanced fuel reactivity and shortened the total combustion time at 600°C.…”

Section: Introductionmentioning

confidence: 99%

Thermochemical conversion characteristics of a single wood pellet in a convective low‐temperature air environment

2020

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Summary In this study, the thermochemical conversion process of a single wood pellet under low temperature (350°C‐650°C) isothermal heating is investigated to identify the outstanding low‐temperature ignition and combustion characteristics for heat generation, particularly during the preheating stages in the furnace. The thermal behavior of wood powder was analyzed using thermogravimetric/Fourier transform infrared spectroscopy. The suspended single pellet combustion phenomenon under a convective hot air stream was also explored. The results showed that the wood primarily decomposed in a range from 240°C to 520°C, and low‐temperature ignition was found at 293°C due to heterogeneous oxidation. For pellet combustion, an outstanding heterogeneous‐induced homogeneous combustion phenomenon occurred when the stream temperature was higher than 350°C. In contrast, the ignition mechanism shifted to volatile auto‐ignite mode at 650°C due to the interplay of fuel devolatilization and oxygen diffusion. The pellet temperature evolution was measured, and the results revealed a maximum heating rate of 6.61‐16.95 K/s under a stream temperature ranging from 350°C to 650°C. The weight loss evolution showed three stages during the entire heating process, and the average activation energy (13.12 kJ/mol) was obtained. Char combustion was found favorable to CO production for gaseous emissions, but the burning of volatiles tended to convert fuel into CO2. Finally, a simplified reaction scheme based on different onset temperatures, including pyrolysis, heterogeneous/homogeneous oxidation, and heterogeneous gasification was proposed to illustrate a potential thermochemical conversion route for further utilization.

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Particle temperature and flue gas emission of a burning single pellet in air and oxy-fuel combustion

Cited by 31 publications

References 28 publications

Biomass Fuel Characteristics of Malaysian Khaya senegalensis Wood-Derived Energy Pellets: Effects of Densification at Varied Processing Temperatures

Biomass Fuel Characteristics of Malaysian Khaya senegalensis Wood-Derived Energy Pellets: Effects of Densification at Varied Processing Temperatures

Visualization of Combustion Phases of Biomass Particles: Effects of Fuel Properties

Thermochemical conversion characteristics of a single wood pellet in a convective low‐temperature air environment

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