Synergetic and inhibition effects in carbon dioxide gasification of blends of coals and biomass fuels of Indian origin

Naidu, V. Satyam; Aghalayam, Preeti; Jayanti, S.

doi:10.1016/j.biortech.2016.02.137

Cited by 65 publications

(12 citation statements)

References 32 publications

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“…As agricultural wastes are generated in large quantities in most countries around the world, at low or no cost, with energy availability ranging between 5 EJ/y and 27 EJ/y [11], the majority of past investigations have studied their co-gasification with high-rank coals, in order to promote their penetration of energy markets and fulfill the Agricultural and Renewables Policy [11,16], as well as promoting circular economy [17][18][19]. Sorghum, fruit waste, spirit-based distillers, empty fruit bunches, sugar cane bagasse, rice straw and walnut shells [20][21][22][23] were among the residues tested. The reaction temperature, flow rate of the gasifying agent, blending ratio, chemical and structural characteristics of feedstocks and composition of ashes were addressed as the key factors affecting the performance of the co-gasification process.…”

Section: Introductionmentioning

confidence: 99%

“…The reaction temperature, flow rate of the gasifying agent, blending ratio, chemical and structural characteristics of feedstocks and composition of ashes were addressed as the key factors affecting the performance of the co-gasification process. Synergetic effects were mostly reported between coal and biomass depending on these factors, increasing or decreasing the reactivity of the fuels and the yield of product gases [17][18][19][20][21]. Alkali and alkaline earth metals in biomass ash were found to enhance the reaction rate of the blends more than expected [17,19,20,24], while Si, Al and P contents in coals were found to inhibit the process [24].…”

Section: Introductionmentioning

confidence: 99%

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Gasification Performance of Barley Straw Waste Blended with Lignite for Syngas Production under Steam or Carbon Dioxide Atmosphere

Vamvuka,

Zacheila

2024

Applied Sciences

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The gasification performance of lignite/barley straw mixtures for syngas production was investigated. The experiments were carried out under a steam or carbon dioxide atmosphere, in fixed-bed and thermogravimetric–mass spectrometry systems. The thermal behavior, reactivity, conversion, product gas composition, liquid and gaseous by-products and interactions between fuels were determined and correlated with the structural characteristics and inherent minerals in ashes, which were analyzed via mineralogical, chemical and fusibility tests. Devolatilization of the materials up to 600 °C resulted in the carbon enrichment of chars and a 30–90-fold increase in the specific surface area. Gaseous and liquid by-products with higher heating values of 5–7 MJ/m3 and 20–28 MJ/kg could offer valuable energy. Upon steam gasification up to 1000 °C, product gas was enriched in hydrogen and carbon monoxide. The syngas yield and heating value of the gas mixture were higher for barley straw fuel (0.77 m3/kg, 11.4 MJ/m3), which, when blended with the lignite, produced upgraded products. Upon carbon dioxide gasification up to 1000 °C, barley straw char exhibited a 3-times higher rate than the lignite, as well as higher conversion (94.5% vs. 62.9%) and a higher syngas yield (0.84 m3/kg vs. 0.55 m3/kg). Lignite/barley straw blends showed synergistic effects and presented higher gasification reactivity and conversion in comparison to lignite. The overall performance of lignite was improved with the steam reagent, while that of barley straw was improved with the carbon dioxide reagent.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Gasification Performance of Barley Straw Waste Blended with Lignite for Syngas Production under Steam or Carbon Dioxide Atmosphere

Vamvuka,

Zacheila

2024

Applied Sciences

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“…In general, the gasification reactivity increases with the increase in temperature, since high temperatures enhance the reaction between SiO 2 , Al 2 O 3 , and active Ca with formation of calcium aluminosilicates and hence minimize the deactivation of K. ,, Moreover, high temperatures during pyrolysis and/or gasification allow for the vaporization of alkali and alkali-earth metals and the formation of alkali silicates − that results in the loss of catalytic activity of the blended char. ,, However, to the best knowledge of the authors, only few studies in the literature , have focused on the influence of the pyrolysis at high temperatures and high heating rates (i.e., fast pyrolysis) on the char co-gasification behavior. Kajitani et al .…”

Section: Introductionmentioning

confidence: 99%

Interactions during CO₂ Co-gasification of Biomass and Coal Chars Obtained from Fast Pyrolysis in a Drop Tube Furnace

et al. 2021

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This work investigated the co-gasification of biomass and coal chars obtained from fast pyrolysis (1000 °C, ∼104 °C s–1) in a drop tube furnace. Olive residue and Soma lignite were fast-pyrolyzed in a drop tube furnace, and different char blends were prepared for co-gasification at different temperatures (800, 900, 950, and 1000 °C) in a thermogravimetric analyzer. The chars obtained from the drop tube furnace were analyzed for their chemical and mineral composition, morphology, surface area, and particle size distribution. Three distinct blends of olive residue and Soma lignite chars were prepared in the (biomass-coal) ratios of 50–50, 25–75, and 10–90. Three kinetic models were fitted to the (co)gasification profiles: the volumetric model, the grain model, and the random pore model. The results showed that fast pyrolysis strongly affected the morphology and surface area of the chars, which were not the decisive factors influencing the gasification behavior. Biochar displayed the presence of K in an active form (K2Ca(CO3)2 and KCl), which had a catalytic effect on the gasification. Synergies during the co-gasification were observed for ratios of biochar above 25%, whereas the 10–90 blend showed a similar gasification behavior to that of the lignite char. The results strongly suggested the existence of a threshold for K/Al and K/Si in the char blend for which synergies can be observed, which coincided with the 25OR-75SL blend, specifically, K/Al = 0.7 and K/Si = 0.4.

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“…The co-utilizations of coal with biomass, such as co-pyrolysis, co-combustion, co-gasification, etc. have been recognized as a promising way to reduce the high dependence on fossil fuels and environmental stress (e.g., global warming, ozone depletion, and acid rain). − Meanwhile, it can optimize the product structure and avoid some operational problems. , Among all the co-utilization technologies, co-gasification has been attracting increasing attention; this process converts different types of biomass and coal to clean synthetic gas for generation of electricity, synthetic liquid fuels, hydrogen, fuel cells, etc …”

Section: Introductionmentioning

confidence: 99%

Regulation of Ash Fusibility Characteristics for High-Ash-Fusion-Temperature Coal by Bean Straw Addition

et al. 2018

Energy Fuels

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The effects of bean straw (BS) on ash fusion behaviors of coals (Jiaozuo (JZ) and Zaozhuang (ZZ)) with high ash fusion temperature (AFT) and the regulating mechanism were investigated from the perspectives of ash chemical composition and mineralogical property. The results showed that the AFT of JZ ash mixture decreased as the BS ash mass ratio increased, while the AFT of the ZZ ash mixture decreased rapidly (0−12%) and then increased slowly (>12%). The existence form of Al 2 O 3 and SiO 2 was converted from high-melting-point (high-MP) mullite into low-melting-point (low-MP) aluminosilicates and their eutectics with BS ash addition, leading to a decrease in AFT. With increasing BS ash ratio, the major mineral reducing the AFT was changed from feldspar into leucite. Magnesia spinel had a weaker effect on improving the AFT than that of mullite or quartz, because of their different molecular structures. The experimental ash samples were divided into three categories, based on the total contents of SiO 2 and Al 2 O 3 (A): I, A ≥ 78.6%; II, 72.2% ≤ A< 78.6%; and III, 62.7% ≤ A < 72.2%. As the A content decreased, the existing form of Na 2 O and K 2 O was transformed from feldspar into leucite and nepheline; the CaO, together with some FeO and MgO, was transformed from anorthite or cordierite into the more easily fusible melilite and clinopyroxene.

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Synergetic and inhibition effects in carbon dioxide gasification of blends of coals and biomass fuels of Indian origin

Cited by 65 publications

References 32 publications

Gasification Performance of Barley Straw Waste Blended with Lignite for Syngas Production under Steam or Carbon Dioxide Atmosphere

Gasification Performance of Barley Straw Waste Blended with Lignite for Syngas Production under Steam or Carbon Dioxide Atmosphere

Interactions during CO₂ Co-gasification of Biomass and Coal Chars Obtained from Fast Pyrolysis in a Drop Tube Furnace

Regulation of Ash Fusibility Characteristics for High-Ash-Fusion-Temperature Coal by Bean Straw Addition

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Synergetic and inhibition effects in carbon dioxide gasification of blends of coals and biomass fuels of Indian origin

Cited by 65 publications

References 32 publications

Gasification Performance of Barley Straw Waste Blended with Lignite for Syngas Production under Steam or Carbon Dioxide Atmosphere

Gasification Performance of Barley Straw Waste Blended with Lignite for Syngas Production under Steam or Carbon Dioxide Atmosphere

Interactions during CO2 Co-gasification of Biomass and Coal Chars Obtained from Fast Pyrolysis in a Drop Tube Furnace

Regulation of Ash Fusibility Characteristics for High-Ash-Fusion-Temperature Coal by Bean Straw Addition

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Interactions during CO₂ Co-gasification of Biomass and Coal Chars Obtained from Fast Pyrolysis in a Drop Tube Furnace