Combustion characteristics of single biomass pellets in a hot gas flow

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

doi:10.9726/kspse.2019.23.2.091

Cited by 4 publications

(9 citation statements)

References 11 publications

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“…Second, the fixed carbon content made the main contribution to the maximum combustion temperature value of the biomass particle (Figure ), mainly due to the strong C–C bonding in the fixed carbon . The results show that the volatile matter and fixed carbon content play a significant role in the combustion phases and their luminous properties.…”

Section: Results and Discussionmentioning

confidence: 87%

“…This is mainly due to the rapid release of the volatile matter and easily formed combustion atmospheres. Meanwhile, it also suggests that the volatile matter in biofuels has good flammability . The maximum R l levels of SD, CC, and RH correlate to the volatile matter contents of each biomass sample, which are 69.38, 74.15, and 64.56%, respectively.…”

Section: Results and Discussionmentioning

confidence: 89%

“…The above results suggest that biofuels with a high fixed carbon content will undergo two combustion phases (the volatile matter and fixed carbon combustion phases). When heating, the volatile matter in the particles is released first to undergo gas-to-gas phase (homogeneous) reactions, indicating that the volatile matter has good flammability . On burning embers with the volatile matter, fixed carbon is ignited, this shows that fixed carbon requires a higher temperature to be ignited compared to volatile matter .…”

Section: Results and Discussionmentioning

confidence: 99%

“…In the fixed carbon combustion stage, the I l of the burning particle (specifically, I l of sawdust) is greater than that of the volatile matter combustion, and fixed carbon content has a greater impact on the I l . The reason for this is that the C–C bond in the fixed carbon can provide higher energy than that in the volatile matter …”

Section: Results and Discussionmentioning

confidence: 99%

“…The reason for this is that the C−C bond in the fixed carbon can provide higher energy than that in the volatile matter. 32 3.5. Effect of Biomass Properties on the Particle Temperature (T p ).…”

Section: Experimental Methodsmentioning

confidence: 99%

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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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Section: Results and Discussionmentioning

confidence: 87%

Section: Results and Discussionmentioning

confidence: 89%

Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

See 3 more Smart Citations

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

Jia

Wang

et al. 2021

ACS Omega

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Combustion and mass loss behavior and characteristics of a single biomass pellet positioning at different orientations in a fixed bed reactor

El‐Sayed

Mostafa²,

Khass³

et al. 2023

Biomass Conv. Bioref.

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This study aims to investigate the combustion characteristics and mass loss behaviors of rice straw and wheat straw biomass pellets experimentally in a laboratory fixed bed combustor under various operating conditions. High-speed photography was used to record images of the combustion process, and a sensitive balance was utilized for recording the particle mass history during the combustion process in addition to K-type thermocouples for temperature measurements. For both materials, the single pellet was exposed to various air temperatures and different flow rates of air. The orientation of the biomass pellet was positioned at various angles from 0 (horizontal), 30°, 45°, 60° (inclined), and 90° (parallel) to the hot air stream at different flow rates. Both glowing reactions and flameless ignition have been noticed in all experiments at all pellet orientations. All pellets experienced low and high luminosity volatiles without flames, followed by a bright radish color and short-lived combustion of the chars. Although the volatile contents of the two materials are identical, the volatile combustion duration of wheat straw (17–258 s) is less than that of rice straw (20–300 s), which could be due to differences in particle sizes, shapes, and structural compositions. The results also show that increased air temperatures lessen the time it takes for volatile and char to ignite and burn off. It also raises the temperature of surface ignition. Starting from the horizontal position and increasing the orientation angle of the pellet, the volatile and char ignition times increase up to 30° and then drop up to 90°, with angle 45° giving the lowest value. The same pattern was also noticed for volatile and char burnout times. The pellet horizontal position (0°) exhibits reduced combustion and mass loss (%) time intervals. The order of increasing the maximum temperature at the pellet surface was 30° > 60° > 90° angles. Increasing the air temperature reduces the times of char combustion, devolatilization, volatile burnout, and char burnout. As the air flow rate increases, the effect on the combustion parameters alternates between increasing and decreasing values.

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Performance Optimisation of Fuel Pellets Comprising Pepper Stem and Coffee Grounds through Mixing Ratios and Torrefaction

et al. 2021

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Agricultural by-products have several disadvantages as fuel, such as low calorific values and high ash contents. To address these disadvantages, this study examined the mixing of agricultural by-products and spent coffee grounds, for use as a solid fuel, and the improvement of fuel characteristics through torrefaction. Pepper stems and spent coffee grounds were first dried to moisture contents of <15% and then combined, with mixing ratios varying from 9:1 to 6:4. Fuel pellets were produced from these mixtures using a commercial pelletiser, evaluated against various standards, and classified as grade A, B, or Bio-SRF. The optimal ratio of pepper stems to spent coffee grounds was determined to be 8:2. The pellets were torrefied to improve their fuel characteristics. Different torrefaction temperatures improved the mass yields of the pellets to between 50.87% and 88.27%. The calorific value increased from 19.9% to 26.8% at 290 °C. The optimal torrefaction temperature for coffee ground pellets was 230 °C, while for other pellets, it was 250 °C. This study provides basic information on the potential enhancement of agricultural by-products for fuel applications.

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Combustion characteristics of single biomass pellets in a hot gas flow

Cited by 4 publications

References 11 publications

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

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

Combustion and mass loss behavior and characteristics of a single biomass pellet positioning at different orientations in a fixed bed reactor

Performance Optimisation of Fuel Pellets Comprising Pepper Stem and Coffee Grounds through Mixing Ratios and Torrefaction

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