Dual fluidized bed gasification of biomass with selective carbon dioxide removal and limestone as bed material: A review

2019 ◽  
Vol 107 ◽  
pp. 212-231 ◽  
Author(s):  
Josef Fuchs ◽  
Johannes C. Schmid ◽  
Stefan Müller ◽  
Hermann Hofbauer
Keyword(s):  
Carbon Dioxide ◽  
Fluidized Bed ◽  
Carbon Dioxide Removal ◽  
Dual Fluidized Bed ◽  
Bed Material

scholarly journals Parametric Study on the Adjustability of the Syngas Composition by Sorption-Enhanced Gasification in a Dual-Fluidized Bed Pilot Plant

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 399
Author(s):  
Selina Hafner ◽  
Max Schmid ◽  
Günter Scheffknecht
Keyword(s):  
Fluidized Bed ◽  
Ghg Emissions ◽  
Space Velocity ◽  
Synthesis Process ◽  
Wood Pellets ◽  
High Hydrogen ◽  
Syngas Production ◽  
Dual Fluidized Bed ◽  
Bed Material ◽  
Gasification Temperature

Finding a way for mitigating climate change is one of the main challenges of our generation. Sorption-enhanced gasification (SEG) is a process by which syngas as an important intermediate for the synthesis of e.g., dimethyl ether (DME), bio-synthetic natural gas (SNG) and Fischer–Tropsch (FT) products or hydrogen can be produced by using biomass as feedstock. It can, therefore, contribute to a replacement for fossil fuels to reduce greenhouse gas (GHG) emissions. SEG is an indirect gasification process that is operated in a dual-fluidized bed (DFB) reactor. By the use of a CO2-active sorbent as bed material, CO2 that is produced during gasification is directly captured. The resulting enhancement of the water–gas shift reaction enables the production of a syngas with high hydrogen content and adjustable H2/CO/CO2-ratio. Tests were conducted in a 200 kW DFB pilot-scale facility under industrially relevant conditions to analyze the influence of gasification temperature, steam to carbon (S/C) ratio and weight hourly space velocity (WHSV) on the syngas production, using wood pellets as feedstock and limestone as bed material. Results revealed a strong dependency of the syngas composition on the gasification temperature in terms of permanent gases, light hydrocarbons and tars. Also, S/C ratio and WHSV are parameters that can contribute to adjusting the syngas properties in such a way that it is optimized for a specific downstream synthesis process.

An Experiment on Solid Circulation Characteristics of a Dual Circulating fluidized Bed Based on Biomaterial Properties and Mechanics Properties

2012 ◽  
Vol 600 ◽  
pp. 261-264
Author(s):  
Teng Ge Mi ◽  
Ying Zhao ◽  
Chang Qing Dong ◽  
Wei Liang Cheng
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Circulation Rate ◽  
Gas Velocity ◽  
Solid Circulation Rate ◽  
Dual Fluidized Bed ◽  
Bed Material ◽  
Circulation Characteristics

In this paper, a dual fluidized bed has been established. The effect of bed material build-up height and gas velocity on the solid circulation rate of CFB (circulating fluidized bed) and BFB (bubble fluidized bed) has been studied. The results show that the solid circulation rate is increased with the increasing of gas velocity Uc and the bed material build-up height. Bed material build-up height of BFB and CFB is changed with the changing of gas velocity Uc. The bed material heights of CFB and BFB have been also investigated in this experiment.

scholarly journals Mixtures of Silica Sand and Calcite as Bed Material for Dual Fluidized Bed Steam Gasification

2017 ◽  
Author(s):  
Anna Magdalena Mauerhofer ◽  
Florian Benedik ◽  
Johannes Christian Schmid ◽  
Hermann Hofbauer
Keyword(s):  
Fluidized Bed ◽  
Steam Gasification ◽  
Silica Sand ◽  
Dual Fluidized Bed ◽  
Bed Material

Comparison of Ash Layer Formation Mechanisms on Si-Containing Bed Material during Dual Fluidized Bed Gasification of Woody Biomass

2020 ◽  
Vol 34 (7) ◽  
pp. 8340-8352
Author(s):  
Robin Faust ◽  
Teresa Berdugo Vilches ◽  
Per Malmberg ◽  
Martin Seemann ◽  
Pavleta Knutsson
Keyword(s):  
Fluidized Bed ◽  
Woody Biomass ◽  
Formation Mechanisms ◽  
Layer Formation ◽  
Ash Layer ◽  
Dual Fluidized Bed ◽  
Bed Material

In Situ CO2Capture in a Dual Fluidized Bed Biomass Steam Gasifier - Bed Material and Fuel Variation

2009 ◽  
Vol 32 (3) ◽  
pp. 348-354 ◽  
Author(s):  
G. Soukup ◽  
C. Pfeifer ◽  
A. Kreuzeder ◽  
H. Hofbauer
Keyword(s):  
Fluidized Bed ◽  
Dual Fluidized Bed ◽  
Bed Material

Fluid-Dynamic Investigations in a Scaled Cold Model for a Dual Fluidized Bed Biomass Steam Gasification Process: Solid Flux Measurements and Optimization of the Cyclone

2007 ◽  
Vol 5 (1) ◽  
Author(s):  
Andreas Kreuzeder ◽  
Christoph Pfeifer ◽  
Hermann Hofbauer
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Separation Efficiency ◽  
Fluid Dynamic ◽  
Steam Gasification ◽  
Circulation Rate ◽  
Cold Model ◽  
Gasification Process ◽  
Dual Fluidized Bed ◽  
Bed Material

Gasification of biomass is an attractive technology for combined heat and power (CHP) production. A dual fluidized bed steam gasifier is in commercial operation at the biomass CHP plant in Guessing/Austria since 2002. For circulating fluidized bed applications the bed material consumption is economically crucial. Thus, cyclones for circulating fluidized beds need to be designed properly. Some erosion and caking in the cyclone of the gasifier could be observed with increasing hours of operation. The influences of these effects as well as the influence of the solid circulation rate between the two units on the separation efficiency were investigated by fluid-dynamic investigations using a scaled cold model. The results show that due to erosion and caking elutriation rates are increased, especially for smaller particles. However, the cyclone achieves fractional separation efficiencies of more than 99.9%.

Advanced dual fluidized bed steam gasification of wood and lignite with calcite as bed material

2017 ◽  
Vol 34 (9) ◽  
pp. 2548-2558 ◽  
Author(s):  
Florian Benedikt ◽  
Josef Fuchs ◽  
Johannes Christian Schmid ◽  
Stefan Müller ◽  
Hermann Hofbauer
Keyword(s):  
Fluidized Bed ◽  
Steam Gasification ◽  
Dual Fluidized Bed ◽  
Bed Material

Potassium Speciation and Distribution for the K2CO3 Additive-Induced Activation/Deactivation of Olivine During Gasification of Woody Biomass

2019 ◽  
Author(s):  
Pavleta Knutsson ◽  
Jelena Maric ◽  
Jesper Knutsson ◽  
Anton Larsson ◽  
Claes Breitholtz ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Photoelectron Spectroscopy ◽  
Paper Analysis ◽  
X Ray ◽  
Activation Procedure ◽  
Dual Fluidized Bed ◽  
Fluidized Bed Gasifier ◽  
Bed Material ◽  
Control Activation ◽  
Low Activity

<p>The GoBiGas plant, which comprises a 32-MW<sub>th </sub>dual fluidized bed gasifier, was constructed as a demonstration unit for converting biomass to biomethane via gasification. On several occasions during the commissioning of the plant, low activity of the olivine bed generated a high content of tar in the produced gas, which was deleterious to the downstream equipment. The problem was attributed to a deficiency of ash constituents, and the solution was to control activation of the bed material through the addition of K<sub>2</sub>CO<sub>3 </sub>to the process. This enabled extended operational periods without tar-related issues. The achieved activity could be lost during interrupted operation at which time the activation procedure had to be repeated. In the present paper analysis of the bed material samples extracted upon activation and after loss of activity using Scanning Electron Microscopy coupled with Energy Dispersive X-ray spectroscopy (SEM-EDS) showed similar morphologies for the ash layers formed around the olivine particles. The observed differences mainly related to the distributions of potassium (K) across the layers. Furthermore, surface analysis showed differences in K speciation within the outer regions. K solubility tests and X-ray photoelectron spectroscopy analyses indicated that K was present as an oxide/hydroxide rather than as a silicate on the surface of the active olivine. The presented results are of major relevance for the operation of dual fluidized bed gasifiers with fuels that are potassium-lean when ash components need to be supplied as additives </p>

Sign in / Sign up

Export Citation Format

Share Document