Airflow Channeling Through Fixed Wheat Straw Bed in an Updraft Gasifier Before the Initiation of Gasification

Tarhan, Sefa

doi:10.1080/00908310390256086

Cited by 11 publications

(4 citation statements)

References 5 publications

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“…It was expected that there would be an inverse correlation between oxygenates and condensed tertiary tar. This contradiction can be due to channeling, which increases with SV . As mentioned above, channeling leads to increased amounts of tar that includes oxygenates at the combustion zone.…”

Section: Resultsmentioning

confidence: 95%

“…Short residence time sometimes is accompanied by channeling, which causes the flow of gas in the gasifier to become nonuniform . Channeling appears at the combustion zone and the reduction zone of the gasifier.…”

Section: Resultsmentioning

confidence: 99%

“…At the combustion zone, oxygen gas, which decreases tar, is not distributed evenly in the gasifier, resulting in increased tar yield. At the reduction zone, the gas tends to flow at the reactor surface as a result of the edge effect of channeling; therefore, tar bypasses the char bed where tar is cracked, resulting in increased tar yield. The change in tar composition, which is shown in the following section, supports the idea that channels were present.…”

Section: Resultsmentioning

confidence: 99%

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Effect of Superficial Velocity on Tar from Downdraft Gasification of Biomass

et al. 2005

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Changes in the amount and composition of tar according to superficial velocity (SV) were investigated in a downdraft biomass gasifier. SV of the downdraft gasification with air was varied in the range of 0.3-0.7 m/s, and tar was recovered at the gasifier outlet. The tar was classified as gravimetric tar and gas-chromatography-detectable (GC-detectable) tar. The lowest gravimetric tar yield (0.7%) was obtained at 0.4 m/s SV, and the highest was obtained at 0.7 m/s. GC-detectable tar yield was highest (1.5%) at 0.7 m/s. One-ring aromatics and naphthalene accounted for more than 80% of GC-detectable tar mass. Some constituents of GC-detectable tar showed specific trends according to SV, although the main composition did not show extreme change. The effect of SV on the production of gases and particles was also studied.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Effect of Superficial Velocity on Tar from Downdraft Gasification of Biomass

et al. 2005

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“…It was shown in [98] that the channelling during biomass gasification leads to an increase in the tar yield. Burnouts and even cavities within the packing can form due to the stable configurations of the particles, especially during the gasification of low-density fuels (e.g., straw) [99,100]. The authors of [101] observed the "fire jump" phenomenon, that is, the predominant propagation of the combustion front through regions with reduced porosity (they attribute this process to differences in the characteristic times for the devolatilisation and the ignition of volatiles in pores).…”

Section: Basic Schemes Of Fixed Bed Conversion and Control Possibilitiesmentioning

confidence: 99%

Particle Agglomeration of Biomass and Plastic Waste during Their Thermochemical Fixed-Bed Conversion

Donskoy

2023

Energies

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The article provides state-of-the-art research on agglomeration processes during fixed-bed combustion and gasification of low-grade fuels such as biomass and waste (primarily plastic-containing waste). Such fuels demonstrate complex thermal behaviour: their decomposition and combustion are multistage, accompanied by phase transitions, and may lead to fixed-bed mechanical instability and the non-uniformity of air distribution over the cross-section. To clarify the role of physicochemical factors (fuel composition and properties, reactor conditions), data from different sources are compared. The review shows that the fixed-bed agglomeration regimes can, in a rough approximation, be classified by the sintering mechanism (due to the melting of the mineral part or the organic part), with the following search for each mechanism realisation conditions by comparing the fuel properties and characteristic temperatures. Attempts to theoretically describe and numerically simulate the agglomeration phenomenon as a change in the structure of a reacting dispersed medium are also considered: the main directions in which such approaches can be developed are indicated.

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Visualization of solid distribution with heterogeneity inside fixed bed gasifier

Yasuda

Murakami

2020

J Mater Cycles Waste Manag

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Airflow Channeling Through Fixed Wheat Straw Bed in an Updraft Gasifier Before the Initiation of Gasification

Cited by 11 publications

References 5 publications

Effect of Superficial Velocity on Tar from Downdraft Gasification of Biomass

Effect of Superficial Velocity on Tar from Downdraft Gasification of Biomass

Particle Agglomeration of Biomass and Plastic Waste during Their Thermochemical Fixed-Bed Conversion

Visualization of solid distribution with heterogeneity inside fixed bed gasifier

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