Thermodynamic investigation of SNG production based on dual fluidized bed gasification of biogenic residues

Bartik, Alexander; Benedikt, Florian; Lunzer, Andreas; Walcher, Constantin; Müller, Stefan; Hofbauer, Hermann

doi:10.1007/s13399-020-00910-y

Cited by 14 publications

(4 citation statements)

References 48 publications

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“…Downstream of the HT‐WGS, the product gas is cooled down to 180 °C, fed into the RME scrubber, and therein again cooled to 40 °C 31 . Thereby, the major water content is condensed, and ammonia (NH 3 ) and partly hydrogen sulfide (H 2 S) are separated as these components are readily water‐soluble 31,42,43 . Furthermore, tar compounds are removed by condensation and absorption in the scrubbing liquid, which is then led into the phase separator.…”

Section: Methodsmentioning

confidence: 99%

Hydrogen production from woody biomass gasification: a techno‐economic analysis

Gubin,

Benedikt,

Thelen

et al. 2024

Biofuels Bioprod Bioref

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Reductions in greenhouse gas emissions are necessary to slow global warming and decrease the likelihood of irreversible climate scenarios. There is thus an urgent need for low‐emissions fuels. This study conducted a techno‐economic analysis of two different industrial plant concepts for producing hydrogen from woody biomass. One was a large‐scale centralized 60 MWH2 option using dual fluidized bed gasification with CO2 removal. The other was a small‐scale decentralized 1 MWH2 option using fixed‐bed gasification without CO2 removal. Mass and energy balances were calculated by the process simulation software IPSEpro. Key performance indicators, including technical, economic, and environmental parameters, were derived. Overall energy efficiencies of 64.2 and 59.5% and hydrogen yields of 87 and 68 gH2 kg−1BM.db were determined for hydrogen production by dual fluidized bed and fixed‐bed gasification, respectively. The levelized costs of hydrogen amounted to 5.6 and 15.0 €2022 kg−1H2 and agreed quite well with values from the literature. Flexible and decentralized heat, electricity, and hydrogen production based on fixed‐bed gasification within a multiproduct plant were also evaluated. The results show that the multiproduct plant could be economically feasible if at least 63% of the annual operating hours were dedicated to hydrogen production, and assuming a hydrogen selling price of 17.5 €2022 kg−1H2 in Austria. In conclusion, both of the processes that were evaluated are conceivable technologies for the transition of the energy system towards renewable energy sources from a technical and economic point of view, although small‐scale hydrogen production is considerably more expensive.

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Section: Methodsmentioning

confidence: 99%

Hydrogen production from woody biomass gasification: a techno‐economic analysis

Gubin,

Benedikt,

Thelen

et al. 2024

Biofuels Bioprod Bioref

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“…In the equilibrium state, the Gibbs free energy is minimized. Detailed descriptions of this approach can be found in literature [32,33].…”

Section: Thermodynamic Calculationsmentioning

confidence: 99%

Conversion of CO2 during the DFB biomass gasification process

Mauerhofer

Müller

Bartik

et al. 2020

Biomass Conv. Bioref.

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In many industrial processes, the climate-damaging gas CO2 is produced as undesired by-product. The dual fluidized bed biomass gasification technology offers the opportunity to tackle this problem by using the produced CO2 within the process as gasification agent. Therefore, a 100 kWth pilot plant at TU Wien was used to investigate the use of CO2 as gasification agent by converting softwood as fuel and olivine as bed material into high-valuable product gas. A parameter variation was conducted, where the typically used gasification agent steam was substituted stepwise by CO2. Thereby, the amount of CO and CO2 increased and the content of H2 decreased in the product gas. These trends resulted in a declining H2/CO ratio and a decreasing lower heating value when CO2 was increased as gasification agent. In contrast to these declining trends, the carbon utilization efficiency showed an increasing course. As second part of this work, a temperature variation from 740 to 840 °C was conducted to investigate the change of the main product gas components. With increasing temperature, CO and H2 increased and CO2 decreased. To determine the degree of conversion of CO2 in the DFB reactor system, two approaches were selected: (1) a carbon balance and (2) a hydrogen balance. This way, it was found out that a certain amount of CO2 was indeed converted at the investigated process conditions. Furthermore, under certain assumptions, the reverse water-gas shift reaction was identified to be the predominant reaction during CO2 gasification.

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“…The gasification encompasses four different processes in the reactor [3,4], namely drying, pyrolysis, combustion or oxidation, and gasification or reduction. The product gas [5,6] can be divided into (1) combustible gases like carbon monoxide, hydrogen, and methane; and (2) incombustible gases such as carbon dioxide, nitrogen and steam. The concentrations of combustible and incombustible gases depend on the gasifier type, the mass flow rate of air, and the feed rate of feedstock, gasification agent, other operating conditions, and solid fuel type [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Experiment and Numerical Studies of the Effect of Equivalent Ratio on Combustion Characteristics in Fluidized Bed Gasifier

Suksuwan¹,

Batcha²,

Palamanit³

et al. 2023

ARFMTS

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The effect of equivalent ratio on fluidized bed gasifier on using kernel mixed palm cake as feedstock was studied experimentally and numerically. A 3-D numerical model of the reactor, similar to the experimental setup, was created using the commercial computational fluid dynamics (CFD) software ANSYS 2019 (Fluent). The fuel feed rate was fixed at 3 kg/hour and the mass flow rate of the air was varied, setting it to equivalent ratios (ER) of 0.1, 0.3, 0.5, and 0.7. The axial temperature profile in the reactor was compared between experimental measurements and numerical simulations and a good agreement was found. Carbon monoxide and volatiles increased when the equivalent ratio decreased, according to the simulations. It was found that ER = 0.1 and ER = 0.3 are suitable equivalent ratios, although the former would not give continuous combustion due to too low reactor temperature.

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Thermodynamic investigation of SNG production based on dual fluidized bed gasification of biogenic residues

Cited by 14 publications

References 48 publications

Hydrogen production from woody biomass gasification: a techno‐economic analysis

Hydrogen production from woody biomass gasification: a techno‐economic analysis

Conversion of CO2 during the DFB biomass gasification process

Experiment and Numerical Studies of the Effect of Equivalent Ratio on Combustion Characteristics in Fluidized Bed Gasifier

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