Investigating the Valorisation of Refused Derived Fuel for Energetic Uses Through Its Co-Gasification with Woody Wastes

Vamvuka, Despina; Teftiki, A.; Sfakiotakis, Stelios

doi:10.51847/2fioejsu7l

Cited by 2 publications

(3 citation statements)

References 21 publications

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“…Interestingly, the addition of a lower amount of CaO catalyst lowered the peak inflection temperature of the process (by 33 °C), which implied that this inorganic compound influenced the temperature sensitivity of the reaction in the presence of carbon dioxide. These findings were consistent with the previously reported data on the catalytic gasification of lignite and biomass fuels under a carbon dioxide atmosphere [6,17,20,21].…”

Section: Samplesupporting

confidence: 93%

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Catalytic Co-gasification of Lignites Blended with a Forest Residue under the Carbon Dioxide Stream

Vamvuka¹,

Loulashi²

2022

Catal Res

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The present study investigated the co-gasification of two different lignites blended with the forest residue collected from the land restoration activity sites of open-pit mines located in the region of the Ptolemais basin in North Greece performed under the carbon dioxide stream. All samples were devolatilized in a fixed bed unit prior to the gasification evaluations. The gasification evaluations were performed using a thermal analysis system (TG/DTG) operated at temperatures of up to 1000 °C. The reactivity, conversion, cold gas efficiency, and influence of the external catalysts CaO and K2CO3 were assessed in the evaluations. The reaction rate of the forest residue was 2–3 folds higher than that of the lignites, with the conversion of the former reaching a value of 96.4% (dry basis), while the conversion of the lignites varied between 43.4% and 51.6%. The peak inflection temperature was in the range of 859–939 °C. The reactivity of the lignite/biomass blends was higher than that of the lignites, and the final conversion was increased by approximately 30%. When individual biochars were impregnated with 30% CaO or K2CO3, the process occurred at lower temperatures, and the conversion of the lignites increased by 35%–40% while that of the forest residue reached a value of 100%. The CaO catalyst performed better. Finally, a blend of equal amounts of Kardia lignite or Ahlada lignite and the forest residue with 30% CaO was formulated, which resulted in an 89.6% or 71.7% conversion to carbon monoxide gas, respectively.

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Section: Samplesupporting

confidence: 93%

“…The concentrations of K and Na were quite low in all fuels. According to previous studies [6,12,16,17,21], the alkali metals K, Na, Ca, Mg, and Fe exhibit catalytic activity during the gasification of char, while Si and Al decelerate the reaction.…”

Section: Characterization Of the Raw Fuels And Biocharsmentioning

confidence: 85%

Catalytic Co-gasification of Lignites Blended with a Forest Residue under the Carbon Dioxide Stream

Vamvuka¹,

Loulashi²

2022

Catal Res

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“…The syngas produced can be used for heat or power generation, as well as for the synthesis of biofuels and chemical substances [10,14,[16][17][18]. When the gasification process-with either steam or carbon dioxide from a residual stream to minimize the greenhouse gas effect used as the gasifying agent-is combined with a pre-pyrolysis step, the reactivity of the charcoal is increased, and operational or downstream tar problems are eliminated [10,13,[19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Energy Recovery from Municipal Solid Waste through Co-Gasification Using Steam or Carbon Dioxide with Olive By-Products

Vamvuka,

Tsilivakos

2024

Energies

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The valorization of untreated municipal waste (MSW) biochar for energetic uses, through its co-gasification with olive stone (OST) biochar under a steam or carbon dioxide atmosphere, was investigated. The experiments were conducted in a fixed bed unit and a thermal analysis–mass spectrometer system. The thermal behavior, reactivity, conversion, product gas composition, syngas yield and energy potential were determined, while the influence of the fuel’s internal structure, chemical functional groups and operating conditions were examined. The concentrations of H2 and CO2 in the product gas mixture under a steam atmosphere were increased with steam/biochar ratio, while that of CO was reduced. At a steam/biochar = 3 H2 yield, the higher heating value and conversion for the OST were 52.8%, 10.8 MJ/m3 and 87.5%; for the MSW, they were 44.4%, 9.9 MJ/m3 and 51.5%, whereas for their blend, they were 50%, 10.6 MJ/m3 and 76.6%, respectively. Under a carbon dioxide atmosphere, the reactivity and conversion of the OST biochar (84%) were significantly higher as compared with the MSW biochar (50%). The higher heating value of the product gas was 12.4–12.9 MJ/m3. Co-gasification of the MSW with OST (in proportions 30:70) resulted in the enhanced reactivity, conversion, syngas yield and heating value of product gas compared with gasification of solely MSW material.

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Investigating the Valorisation of Refused Derived Fuel for Energetic Uses Through Its Co-Gasification with Woody Wastes

Cited by 2 publications

References 21 publications

Catalytic Co-gasification of Lignites Blended with a Forest Residue under the Carbon Dioxide Stream

Catalytic Co-gasification of Lignites Blended with a Forest Residue under the Carbon Dioxide Stream

Energy Recovery from Municipal Solid Waste through Co-Gasification Using Steam or Carbon Dioxide with Olive By-Products

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