Study on the effect of gasification agents on the integrated system of biomass gasification combined cycle and oxy-fuel combustion

Xiang, Yanlei; Cai, Lei; Guan, Yanjin; Liu, Wenbin; Cheng, Zeyang; Liu, Zexi

doi:10.1016/j.energy.2020.118131

Cited by 55 publications

(5 citation statements)

References 61 publications

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“…The high production of hydrogen can be attributed to the use of steam, oxygen and air as gasification medium. The highest sensible energy efficiency value was obtained for air as a gasification medium, while the optimal value was obtained for steam as a gasification medium [14,15].…”

Section: Dry Feedstock + Heat → Char + Volatiles Mattermentioning

confidence: 97%

The Impact of Temperature on the Production of High Calorific Value Syngas using Cogasification Technology

Imron Rosyadi,

Yusvardi Yusuf,

Nuryoto

et al. 2024

ARFMTS

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Cogasification represents a thermochemical reaction employed to transform by combining biomass or fossil carbonaceous materials into combustible matters. Widely acknowledged as the most appealing approach among various combustible material to useful energy. This method offers significant potential for environmentally friendly energy production, boasting low carbon emissions. This study conducted gasification tests utilizing an updraft gasifier, incorporating parameters variable at 650°C to 850°C. The materials utilized consisted of a blend of Municipal-Solid-Waste (MSW) and coconut shells, maintaining a steam to biomass at 1.3. Optimum temperature at 750°C, the syngas revealed 41.30% mol CO, 20.90 mol% CO2 37.25 mol% H2, and 0.55 mol% CH4. Notably. The highest H2 gas production was achieved at this temperature. Furthermore, the net caloric value at this temperature, surpassed other variations, reaching 374.67 kJ/mol, accompanied by the generation of 11.38% of tar and 21.1% char.

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Section: Dry Feedstock + Heat → Char + Volatiles Mattermentioning

confidence: 97%

The Impact of Temperature on the Production of High Calorific Value Syngas using Cogasification Technology

Imron Rosyadi,

Yusvardi Yusuf,

Nuryoto

et al. 2024

ARFMTS

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“…In contrast to air gasification, when using CO 2 as a gasifying medium the dilution of syngas with air-derived N 2 is avoided, leading to higher heating value fuel gas mixtures. In addition, contrary to steam gasification, the use of CO 2 as gasifying agent eliminates the heat demands associated with water evaporation [23]. Moreover, CO 2 favors the cracking of volatiles, resulting in reduced tar formation and higher syngas production.…”

Section: Introductionmentioning

confidence: 99%

CO2 Gasification Reactivity and Syngas Production of Greek Lignite Coal and Ex-Situ Produced Chars under Non-Isothermal and Isothermal Conditions: Structure-Performance Relationships

et al. 2022

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The presented work explores the structural properties, gasification reactivity, and syngas production of Greek lignite fuel (LG) and ex-situ produced chars during CO2 gasification. Three different slow pyrolysis protocols were employed for char production involving torrefaction at 300 °C (LG300), mild-carbonization at 500 °C (LG500), and carbonization at 800 °C (LG800). Physicochemical characterization studies, including proximate and ultimate analysis, X-ray Diffraction (XRD), and Raman spectroscopy, revealed that the thermal treatment under inert atmospheres leads to chars with increased fixed carbon content and less ordered surface structures. The CO2 gasification reactivity of pristine LG and as-produced chars was examined by thermogravimetric (TG) analysis and in batch mode gasification tests under both isothermal and non-isothermal conditions. The key parameters affecting the devolatilization and gasification steps in the overall process toward CO-rich gas mixtures were thoroughly explored. The gasification performance of the examined fuels in terms of carbon conversion, instant CO production rate, and syngas generation revealed an opposite reactivity order during each stage. TG analysis demonstrated that raw lignite (LG) was more reactive during the thermal devolatilization phase at low and intermediate temperatures (da/dtmax,devol. = 0.022 min−1). By contrast, LG800 exhibited superior gasification reactivity at high temperatures (da/dtmax,gas. = 0.1 min−1). The latter is additionally corroborated by the enhanced CO formation of LG800 samples under both non-isothermal (5.2 mmol) and isothermal (28 mmol) conditions, compared to 4.1 mmol and 13.8 mmol over the LG sample, respectively. The pronounced CO2 gasification performance of LG800 was attributed to its higher fixed carbon content and disordered surface structure compared to LG, LG300, and LG500 samples.

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“…In addition to air, other gasification agents can be used, such as O2, steam and CO2 or a combination of them in the gasification process. This approach allows to obtain a nitrogen free syngas making it possible to transform it into chemicals or fuels [2,3].…”

Section: Introductionmentioning

confidence: 99%

Biomass oxy-CO₂ gasification process for bio-methane production: an experimental and numerical activity

Gabbrielli

Barontini

Frigo

et al. 2022

J. Phys.: Conf. Ser.

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Biomass gasification is a thermochemical process in which the biomass is converted into a mixture of gases, called syngas, commonly utilised in thermal machines to produce electricity and heat. In the present research activity, the conventional air-gasification in downdraft gasifier is replaced by oxy-CO2 gasification technology. This strategy allows to obtain a nitrogen-free syngas, mainly composed by CO, H2, CO2 and CH4, which can be used into the synthesis of various bio-fuels like methanol or synthetic natural gas (SNG). Carbon dioxide is utilized as gasifying agent together with oxygen to mitigate the reactivity of the latter, which can lead to excessive reaction temperatures. In particular, the present work shows the preliminary results of an experimental campaign carried on utilizing a small scale downdraft gasifier (max thermal power of roughly 100 kW) fed with wood pellet and using a mixture of oxygen and CO2 as gasification agent. The experimental results have been utilized to calibrate a pseudo-kinetic model of the oxy-CO2 gasification process, implemented in Aspen Plus environment. To analyse the possibility to transform the produced syngas into methane, an additional numerical model of a methanation plant was then utilised. As a whole, the numerical analysis confirms its usefulness in predicting the performance of the gasifier, which can reach a cold gas efficiency of around 70%, while the methanation plant can achieve a production of roughly 20 kg of methane per 100 kg of gasified wood.

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Study on the effect of gasification agents on the integrated system of biomass gasification combined cycle and oxy-fuel combustion

Cited by 55 publications

References 61 publications

The Impact of Temperature on the Production of High Calorific Value Syngas using Cogasification Technology

The Impact of Temperature on the Production of High Calorific Value Syngas using Cogasification Technology

CO2 Gasification Reactivity and Syngas Production of Greek Lignite Coal and Ex-Situ Produced Chars under Non-Isothermal and Isothermal Conditions: Structure-Performance Relationships

Biomass oxy-CO₂ gasification process for bio-methane production: an experimental and numerical activity

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Study on the effect of gasification agents on the integrated system of biomass gasification combined cycle and oxy-fuel combustion

Cited by 55 publications

References 61 publications

The Impact of Temperature on the Production of High Calorific Value Syngas using Cogasification Technology

The Impact of Temperature on the Production of High Calorific Value Syngas using Cogasification Technology

CO2 Gasification Reactivity and Syngas Production of Greek Lignite Coal and Ex-Situ Produced Chars under Non-Isothermal and Isothermal Conditions: Structure-Performance Relationships

Biomass oxy-CO2 gasification process for bio-methane production: an experimental and numerical activity

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Biomass oxy-CO₂ gasification process for bio-methane production: an experimental and numerical activity