Cold flow model investigations of the countercurrent flow of a dual circulating fluidized bed gasifier

Schmid, Johannes Christian; Pröll, Tobias; Kitzler, Hannes; Pfeifer, Christoph; Hofbauer, Hermann

doi:10.1007/s13399-012-0035-5

Cited by 46 publications

(20 citation statements)

References 37 publications

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“…This was realized through a new design of the GR. In particular, the upper part of the GR is divided into a sequence of sections, which ensures improved gas-particle interaction using flow obstacles in defined height intervals, as reported by Schmid et al [16] and Pfeifer et al [17]. The advanced pilot plant went into operation in 2014.…”

Section: General Descriptionmentioning

confidence: 99%

“…By calculating the pressure gradient, the highest gradient occurs directly at the flow constriction, and the particle concentration is highest just above the flow constrictions. The obvious particle acceleration effects in the constriction region can explain the deviation of the pressure gradient and solid density [16,24]. The particles take up kinetic energy in the constriction region, which results in an increased pressure drop.…”

Section: Fluid Dynamics Of the Advanced Reactor Designmentioning

confidence: 99%

“…Extensive cold flow model experiments with different generations of acrylic glass models were conducted as a basis for the design of the advanced reactor system [16,24,25]. The design study led to a specific cold flow model, which is presented with Figure 9.…”

Section: Fluid Dynamics Of the Advanced Reactor Designmentioning

confidence: 99%

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Syngas for biorefineries from thermochemical gasification of lignocellulosic fuels and residues—5 years’ experience with an advanced dual fluidized bed gasifier design

Schmid

Benedikt

Fuchs

et al. 2019

Biomass Conv. Bioref.

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In many processes proposed for biorefineries, recycling procedures, and industrial or agricultural production processes, residue is generated which could be further transformed by thermochemical conversion via gasification. The technology of dual fluidized bed steam gasification is capable of producing a valuable product gas out of such residue. The generated nitrogen-free product gas can be used for heat and power production and is suitable for separating gases (e.g. hydrogen). However, if the product gas is cleaned, its use as syngas is more beneficial for manufacturing renewable chemical substances, like synthetic natural gas, methanol, Fischer-Tropsch liquids, or mixed alcohols. This paper presents the results of experimental research from gasification test runs of different biogenic fuels, carried out with an advanced 100 kW pilot plant over the last 5 years at TU Wien. The focus is to provide an overview of measured results validated by mass and energy balances and to present key calculated performance indicating key figures of the test runs. In this way, the influence of various operational parameters and the composition of the product gas are evaluated. The presented results form the basis for the proper design of suitable gas-cleaning equipment. Subsequently, the clean syngas is available for several synthesis applications in future biorefineries.

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Section: General Descriptionmentioning

confidence: 99%

Section: Fluid Dynamics Of the Advanced Reactor Designmentioning

confidence: 99%

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Syngas for biorefineries from thermochemical gasification of lignocellulosic fuels and residues—5 years’ experience with an advanced dual fluidized bed gasifier design

Schmid

Benedikt

Fuchs

et al. 2019

Biomass Conv. Bioref.

Self Cite

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“…Due to the difference in superficial air velocity in AR and FR, two different fluidization regimes were developed in AR and FR as displayed in Figs. 6 and 7 [60,61].…”

Section: Reference Case Simulation and Verificationmentioning

confidence: 99%

Computational study of solid circulation in chemical-looping combustion reactor model

et al. 2015

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“…The advanced reactor design enhances the gas-solid contact by a column with turbulent fluidized zones (upper gasification reactor), which is placed subsequent to the lower bubbling bed of the gasification reactor. The geometrical modifications in this upper part lead to an improved bed material holdup [18] and enlarge the range of applicable fuels because of higher tar and char conversion rates compared to other DFB systems. Further, gravity separators with gentle separation characteristics instead of cyclones support the use of soft bed materials such as limestone.…”

Section: Assumptions For Modelingmentioning

confidence: 99%

The impact of gasification temperature on the process characteristics of sorption enhanced reforming of biomass

Fuchs

Schmid

Müller

et al. 2019

Biomass Conv. Bioref.

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Especially carbon-intensive industries are interested in a decarbonization of their processes. A technology, which can contribute to a significant reduction of the carbon footprint, is the so-called sorption enhanced reforming process. The sorption enhanced reforming process uses a dual fluidized bed reactor system with limestone as a bed material for the thermochemical conversion of biomass into a valuable nitrogen-free product gas. This product gas can be used for further synthesis processes like methanation. The dependency of the product gas composition on the gasification temperature is already a well-known fact. Nevertheless, detailed investigations and models of the effect on elemental balances (especially carbon) of the process are missing in the literature and are presented in this work. Therefore, previously published data from different pilot plants is summarized and is discussed on a mass balance. Based on this information, investigations on the product gas equilibrium composition are presented and conclusions are drawn: it can be shown that the sorption enhanced reforming process can be divided into two sub-processes, namely Bcarbonation dominated sorption enhanced reforming^and Bwater-gas shift dominated sorption enhanced reforming.T he sub-process carbonation dominated SER is characterized by a high deviation from the water-gas shift equilibrium and a nearly constant CO content in the product gas over gasification temperature (< 700°C). The sub-process water-gas shift dominated SER can be identified by a steep increase of the CO content in the product gas over temperature and nearly equilibrium state of the water-gas shift reaction (700-760°C).

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Cold flow model investigations of the countercurrent flow of a dual circulating fluidized bed gasifier

Cited by 46 publications

References 37 publications

Syngas for biorefineries from thermochemical gasification of lignocellulosic fuels and residues—5 years’ experience with an advanced dual fluidized bed gasifier design

Syngas for biorefineries from thermochemical gasification of lignocellulosic fuels and residues—5 years’ experience with an advanced dual fluidized bed gasifier design

Computational study of solid circulation in chemical-looping combustion reactor model

The impact of gasification temperature on the process characteristics of sorption enhanced reforming of biomass

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