scholarly journals Parametric experimental tests of steam gasification of pine wood in a fluidized bed reactor

2013 ◽  
Vol 44 (2s) ◽  
Author(s):  
L. Vecchione ◽  
M. Moneti ◽  
S. Cocchi ◽  
M. Villarini ◽  
M. Sisinni ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Renewable Energy Sources ◽  
Ghg Emissions ◽  
Experimental Tests ◽  
Steam Gasification ◽  
High Hydrogen ◽  
Bench Scale ◽  
Residual Biomass ◽  
Industrial Sectors ◽  
Pine Trees

Among Renewable Energy Sources (RES), biomass represent one of the most common and suitable solution in order to contribute to the global energy supply and to reduce greenhouse gases (GHG) emissions. The disposal of some residual biomass, as pruning from pine trees, represent a problem for agricultural and agro-industrial sectors. But if the residual biomass are used for energy production can become a resource. The most suitable energy conversion technology for the above-mentioned biomass is gasification process because the high C/N ratio and the low moisture content, obtained from the analysis. In this work a small-pilot bubbling-bed gasification plant has been designed, constructed and used in order to obtain, from the pine trees pruning, a syngas with low tar and char contents and high hydrogen content. The activities showed here are part of the activities carried out in the European 7FP UNIfHY project. In particular the aim of this work is to develop experimental test on a bench scale steam blown fluidized bed biomass gasifier. These tests will be utilized in future works for the simulations of a pilot scale steam fluidized bed gasifier (100 kWth) fed with different biomass feedstock. The results of the tests include produced gas and tar composition as well gas, tar and char yield. Tests on a bench scale reactor (8 cm I.D.) were carried out varying steam to biomass ratio from 0.5, 0.7 and 1 to 830°C.

scholarly journals Steam Gasification of Lignite in a Bench-Scale Fluidized-Bed Gasifier Using Olivine as Bed Material

2020 ◽  
Vol 10 (8) ◽  
pp. 2931 ◽  
Author(s):  
Elisa Savuto ◽  
Jan May ◽  
Andrea Di Carlo ◽  
Katia Gallucci ◽  
Andrea Di Giuliano ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Experimental Tests ◽  
Steam Gasification ◽  
Effect Of Temperature ◽  
Bench Scale ◽  
Tar Reduction ◽  
Fluidized Bed Gasifier ◽  
Bed Material ◽  
Conversion Efficiencies

The gasification of lignite could be a promising sustainable alternative to combustion, because it causes reduced emissions and allows the production of syngas, which is a versatile gaseous fuel that can be used for cogeneration, Fischer-Tropsch synthesis, or the synthesis of other bio-fuels, such as methanol. For the safe and smooth exploitation of syngas, it is fundamental to have a high quality gas, with a high content of H2 and CO and minimum content of pollutants, such as particulate and tars. In this work, experimental tests on lignite gasification are carried out in a bench-scale fluidized-bed reactor with olivine as bed material, chosen for its catalytic properties that can enhance tar reduction. Some operating parameters were changed throughout the tests, in order to study their influence on the quality of the syngas produced, and pressure fluctuation signals were acquired to evaluate the fluidization quality and diagnose correlated sintering or the agglomeration of bed particles. The effect of temperature and small air injections in the freeboard were investigated and evaluated in terms of the conversion efficiencies, gas composition, and tar produced.

In-Situ CO2-Absorption in a Dual Fluidized Bed Biomass Steam Gasifier to Produce a Hydrogen Rich Syngas

2007 ◽  
Vol 5 (1) ◽  
Author(s):  
Christoph Pfeifer ◽  
Bernhard Puchner ◽  
Hermann Hofbauer
Keyword(s):  
Fluidized Bed ◽  
Renewable Energy Sources ◽  
Steam Gasification ◽  
Co2 Absorption ◽  
Producer Gas ◽  
High Hydrogen ◽  
Selective Transport ◽  
Operation Conditions ◽  
Dual Fluidized Bed ◽  
Bed Material

Within the last years renewable energy sources came more and more into the public focus. Steam gasification of solid biomass yields high quality producer gases that can be used for efficient combined heat and power production (CHP) and as a renewable resource for chemical syntheses. The dual fluidized bed steam gasification technology provides the necessary heat for steam gasification by circulating hot bed material that is heated in a second fluidized bed reactor by combustion of residual biomass char. The hydrogen content in producer gas of such gasifiers is about 40vol% (dry basis). Addition of carbonates to the bed material and adequate adjustment of operation conditions in the reactors allow selective transport of CO2 from gasification to combustion zone (Absorption Enhanced Reforming – AER concept). An 8MW (fuel power) CHP plant successfully demonstrates gasification in Guessing, Austria since 2002. A process development unit (100 kW fuel power) has been recently operated to investigate the potential of the selective CO2 transport achieving a H2 content of up to 75vol% (dry basis) in the producer gas. No significant increase in tar formation occurs despite the low gasification temperatures (600-700°C). It can be shown, that the selective transport of CO2 yields high hydrogen contents in the producer gas and the possibility of operating at lower temperatures increases the efficiency of energy conversion.

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.

Characterisation of Tar produced in the Gasification of Biomass with in situ Catalytic Reforming

2010 ◽  
Vol 8 (1) ◽  
Author(s):  
Sergio Rapagnà ◽  
Katia Gallucci ◽  
Manuela Di Marcello ◽  
Muriel Matt ◽  
Pier U Foscolo ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Renewable Energy Sources ◽  
Technical Specification ◽  
Steam Gasification ◽  
Outlet Temperature ◽  
Processing Unit ◽  
Reactor Outlet ◽  
Distributed Power Generation ◽  
Product Gas ◽  
Power Generation Systems

This paper concerns the cleaning of the hot gas produced by steam gasification of biomass in a fluidized bed. The cleaning takes place in a catalytic filter candle device placed directly in the freeboard of the bed. Such integration results in a compact processing unit and increased thermal efficiency; the result of the cleaning being carried out directly at the reactor outlet temperature. It thus lends itself to exploitation in distributed power generation systems utilizing renewable energy sources. Results are reported for runs performed in a bench scale fluidized bed steam gasifier fitted with a single full-size catalytic candle filter. Tar and particulates in the product gas were sampled in accord with technical specification CEN/TS 15439 with analysis by UV and fluorescence spectroscopy.

Effect of Bed Material on Oxygen/Steam Gasification of Two Solid Recovered Fuels (SRFs) in a Bench-Scale Fluidized-Bed Reactor

2017 ◽  
Vol 31 (8) ◽  
pp. 8445-8453 ◽  
Author(s):  
J. Recari ◽  
C. Berrueco ◽  
S. Abelló ◽  
D. Montané ◽  
X. Farriol
Keyword(s):  
Fluidized Bed ◽  
Fluidized Bed Reactor ◽  
Steam Gasification ◽  
Bench Scale ◽  
Bed Material

scholarly journals Steam gasification of lignite and solid recovered fuel (SRF) in a bench scale fluidized bed gasifier

2020 ◽  
Vol 114 ◽  
pp. 341-350 ◽  
Author(s):  
Elisa Savuto ◽  
Andrea Di Carlo ◽  
Katia Gallucci ◽  
Andrea Di Giuliano ◽  
Sergio Rapagnà
Keyword(s):  
Fluidized Bed ◽  
Steam Gasification ◽  
Bench Scale ◽  
Fluidized Bed Gasifier

scholarly journals Influences of the Pretreatments of Residual Biomass on Gasification Processes: Experimental Devolatilizations Study in a Fluidized Bed

2021 ◽  
Vol 11 (12) ◽  
pp. 5722
Author(s):  
Stefania Lucantonio ◽  
Andrea Di Giuliano ◽  
Katia Gallucci
Keyword(s):  
Fluidized Bed ◽  
Molar Ratio ◽  
Thermochemical Conversion ◽  
Chemical Looping ◽  
Carbon Conversion ◽  
European Research ◽  
Residual Biomass ◽  
General Improvement ◽  
Straight Lines ◽  
Integral Average

The European research project CLARA (chemical looping gasification for sustainable production of biofuels, G.A. 817841) investigated chemical looping gasification of wheat straw pellets. This work focuses on pretreatments for this residual biomass, i.e., torrefaction and torrefaction-washing. Devolatilizations of individual pellets were performed in a laboratory-scale fluidized bed made of sand, at 700, 800, and 900 °C, to quantify and analyze the syngas released from differently pretreated biomasses; experimental data were assessed by integral-average parameters: gas yield, H2/CO molar ratio, and carbon conversion. A new analysis of devolatilization data was performed, based on information from instantaneous peaks of released syngas, by simple regressions with straight lines. For all biomasses, the increase of devolatilization temperature between 700 and 900 °C enhanced the thermochemical conversion in terms of gas yield, carbon conversion, and H2/CO ratio in the syngas. Regarding pretreatments, the main evidence is the general improvement of syngas quality (i.e., composition) and quantity, compared to those of untreated pellets; only slighter differentiations were observed concerning different pretreatments, mainly thanks to peak quantities, which highlighted an improvement of the H2/CO molar ratio in correlation with increased torrefaction temperature from 250 to 270 °C. The proposed methods emerged as suitable straightforward tools to investigate the behavior of biomasses and the effects of process parameters and biomass nature.

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