Separation of particles from hot gases using metallic foams

Ghidossi, Rémy; Bonnet, J.P.; Rebollar-Pérez, Georgette; Carretier, Émilie; Ferrasse, Jean‐Henry; Vicente, Jérôme; Topin, Frédéric; Moulin, Philippe

doi:10.1016/j.jmatprotec.2008.08.033

Cited by 17 publications

(8 citation statements)

References 32 publications

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“…One of these products is the solid particles leaving the fluidized bed. In recent years, the use of ceramic and metallic filters for particle filtration at hot conditions has been investigated [4][5][6]. Another product is tar, composed by those organic compounds with a molecular weight larger than benzene [7].…”

Section: Introductionmentioning

confidence: 99%

Tar abatement for clean syngas production during biomass gasification in a dual fluidized bed

Diego

Garcı́a-Labiano

Gayán

et al. 2016

Fuel Processing Technology

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Syngas obtained from biomass gasification needs to fulfil strong purity requirements before being used as raw material in power energy generation or chemicals manufacturing. The use of hot catalytic filter candles inside the freeboard of fluidized bed gasifiers allows obtaining clean syngas without dust and low tar content. The tar removal efficiency of four different catalytic filter designs was evaluated with real biomass tar produced in situ in a dual fluidized bed gasifier (DFBG). The tar conversion reached at the outlet of the fluidized bed gasifier was larger for the candles with catalytically active layer design. If a monolith is also incorporated, the tar conversion increases up to 95% which is one of the highest values obtained up to date. In this case, the tar content at the outlet of the catalytic filter was as low as 0.2 g/Nm 3 (N 2 free, d.b.).

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Section: Introductionmentioning

confidence: 99%

Tar abatement for clean syngas production during biomass gasification in a dual fluidized bed

Diego

Garcı́a-Labiano

Gayán

et al. 2016

Fuel Processing Technology

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“…One of the solutions to this problem is to use a hot gas to unclog the filters [19].  Cracks can also appear after explosions inside the candles due to the simultaneous presence of dust and flammable gas [21,22].  Over time, a residual particle deposit forms on the filter surface and leads to irreversible fouling [13,21].…”

Section: Candle Filtersmentioning

confidence: 99%

“…Depending on the alloy used in the candles, they can be operated at temperatures up to 1000°C. However, temperatures reported in the literature are between 400 and 700°C [7,20,22]. Metal filters like ceramic filters form a residual particle deposit.…”

Section: Candle Filtersmentioning

confidence: 99%

“…Metal filters like ceramic filters form a residual particle deposit. With the metal filter, this particle deposit can be completely removed by a backwash filter with sulfuric acid [22]. The disadvantage of this method is that it must be carried out at room temperature and requires treating the liquid effluent.…”

Section: Candle Filtersmentioning

confidence: 99%

“…The disadvantage of this method is that it must be carried out at room temperature and requires treating the liquid effluent. Another option discussed by Ghidossi et al [22] consists in placing the clogged filter in an oven with air circulation at 900°C for a predetermined period (8 h) to allow complete oxidation of the particles leading to their elimination. This method is long and only partially regenerates the filter (approximately 80%).…”

Section: Candle Filtersmentioning

confidence: 99%

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Separation of particles from syngas at high-temperatures with an electrostatic precipitator

Villot¹,

Gonthier²,

Gonze³

et al. 2012

Separation and Purification Technology

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, et al.. Separation of particles from syngas at high-temperatures with an electrostatic precipitator. Separation and Purification Technology, Elsevier, 2012, 92, pp.181 -190. 10 The study, which is submit to you, was supported by the French National Agency and it is incorporated in the EPURGAZ project (ANR-06-BIOE-O05). The aim of this project was to study the different existing possible way to clean syngas from biomass gasification at high temperatures (> 500°C). This project was realized in partnership with the French Institute of Petrol (IFP -Lyon), the French Atomic Energy Commission (CEA -Grenoble), Air Liquid (Loges en Josas) and the Savoie University.This study shown the possibility to use an electrostatic precipitator at temperatures above 500°C to remove the particles contained in syngas from biomass gasification. Indeed, the filtration efficiency obtained during the filtration tests conducted at the CEA site in Grenoble, FRANCE, were greater than 95%.I submit you only 2 reviewers because I did not find an others :  The possibility of removing the particles from syngas at high temperature with an electrostatic precipitator (>500°C) was studied. Syngas filtration tests conducted directly downstream of a gasifier. Two filtration tests were realized : the first at a temperature of 510°C and the second at 680°C. For each filtration tests, an average mass filtration efficiency greater than 95% was obtained. Grenoble Cedex 9, FRANCE Abstract-The synthesis gas stemming from biomass gasification contains particles (ashes, soot, etc.), which, if not removed, can induce severe operational damage. The problem is more serious if syngas must be used for chemical synthesis as in the Fischer-Tropsch catalyst reaction or the water-gas shift. The particles contained in syngas can reduce or inhibit the catalyst effect. Moreover, for energy reasons, it is also necessary to develop a filtration process at as high a temperature as possible. To address this issue, a study to show the possibility of removing the particles from syngas with an electrostatic precipitator at high temperature (500-1000°C) and pressure (0.1-1 MPa) was conducted. Syngas filtration tests conducted directly downstream of a gasifier demonstrated the feasibility of implementing an electrostatic precipitator to clean syngas at temperatures above 500°C.

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