Steam Gasification of Cellulose and Wood in a Fluidized Bed of Porous Clay Particles

Noda, Reiji; Ito, Tomoyuki; Tanaka, Nao; Horio, Masayuki

doi:10.1252/jcej.07we317

Cited by 6 publications

(4 citation statements)

References 23 publications

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“…[21] using silica sand and sepiolite under pyrolysis conditions in an auger reactor. On the other hand, Noda et al [20] only obtained a slightly higher H 2 concentration in the gas due to the use of acidified bentonite.…”

Section: Gas Compositionmentioning

confidence: 93%

“…These materials have been used as oil-spill and dyes adsorbents from surfaces and waste water effluents [15,16]. Natural occurring clays have been studied for pyrolysis and gasification applications [17][18][19][20][21]. All these studies agree that porous materials such as sepiolite, zeolite or bentonite, with a high pore structure and surface area, enhance the adsorption of tar and alkali content as well as they promote tar cracking reactions.…”

Section: Introductionmentioning

confidence: 94%

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Effect of sepiolite bed material on gas composition and tar mitigation during C. cardunculus L. gasification

Serrano

Sánchez-Delgado

Horvat

2017

Chemical Engineering Journal

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Sepiolite, a clay mineral that is commonly used as adsorbent, is proposed as bed material for biomass gasification in a lab-scale bubbling fluidized bed. In order to compare the obtained gas composition and tar generation, silica sand has been used as reference bed material. C. cardunculus L. has been employed as biomass feedstock. The operating temperature is varied from 830 to 875°C, at constant equivalence ratio (ER) of 0.30. The gas produced with sepiolite as bed material has a slightly lower quality than the gas generated with silica sand, the lower heating value (LHV) is 0.4-1.4 MJ/Nm 3 lower for sepiolite than for silica sand. However, the tar generation is rather reduced in the sepiolite bed and the tar composition is also different among the bed materials: the polycyclic aromatic hydrocarbons fraction (PAH) is drastically reduced while oxygenated compounds arise in the sepiolite tests. Sepiolite properties such as surface area and morphology have been analysed by means of specific surface area (BET) and scanning electron microscopy (SEM-EDS) before and after the experiments. The fuel behaviour and the properties of sepiolite induce the adsorption of tars and molten ashes on the sepiolite surface, leading to a much better performance in terms of tar mitigation and agglomeration.

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Section: Gas Compositionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 94%

Effect of sepiolite bed material on gas composition and tar mitigation during C. cardunculus L. gasification

Serrano

Sánchez-Delgado

Horvat

2017

Chemical Engineering Journal

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“…Bentonite is a kind of natural clay consisting of montmorillonite as a main constituent, which has been used in many industrial applications (Nagendrappa, 2002;Önal, 2006). e potential of bentonite bed material for tar reduction in uidized bed biomass gasi cation has already been proven by Noda et al (2009). Clay is sticky and plastic when containing moisture at room temperature, but easily becomes hard by thermal treatment.…”

Section: Introductionmentioning

confidence: 99%

Agglomeration and Defluidization of Silica Sand and Bentonite Particles during Empty Fruit Bunch (EFB) Ash Addition in Bubbling Fluidized Bed (BFB) Processes

Prima

Noda

2021

J. Chem. Eng. Japan / JCEJ

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Interaction of silica sand or bentonite particles with alkaline components contained in ash of empty fruits bunches (EFB) was investigated by observation of agglomeration and de uidization behaviors in a bubbling uidized bed process at conventional gasi cation temperatures. In this study, agglomeration and de uidization formation along with EFB ash addition were evaluated by di erential pressure change of the uidized bed, and sticky level of agglomerates estimated by elemental analysis of particles in bed residue and discharged line. Fluidization operation at 750°C showed that number of coarse agglomerates formed after at more than 0.12 wt% of EFB ash addition with high sticky level on silica sand particles while bentonite kept running in normal uidization until 4.66 wt% addition. Bubbling uidization at 800°C has a higher tendency to form bigger and stickier agglomeration on both particles. In the silica sand bed, hard and sticky agglomerates were built up to form extensive bulk agglomerates at more than 1.55 wt% ash addition. On the other hand, bentonite also produced huge agglomerates, but a part of the bed was still uidized because of the formation of weak agglomerates. The di erence was caused by the structure of the agglomerates. Application of bentonite in uidized bed gasi ers is, therefore, more promising to maintain uidization state than silica sand.

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“…wet impregnation of calcined olivine with nickel nitrate [18] and loading with active metals, such as Fe, Ni, Co, Ce, etc [23]. In the case of sepiolite, different studies have proven the tar sorption and tar cracking reactions induced by this material during biomass pyrolysis and gasification processes [24][25][26][27][28][29]. Serrano et al [29] found an increase of the performance of a bubbling fluidized bed air gasifier working with lignocellulosic biomass when using sepiolite instead of silica sand as bed material, due to the tar reduction and mitigation of agglomeration problems in the sepiolite bed.…”

Section: Introductionmentioning

confidence: 99%

Effect of bed material density on the performance of steam gasification of biomass in bubbling fluidized beds

Soria-Verdugo

Berg

Serrano

et al. 2019

Fuel

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Steam Gasification of Cellulose and Wood in a Fluidized Bed of Porous Clay Particles

Cited by 6 publications

References 23 publications

Effect of sepiolite bed material on gas composition and tar mitigation during C. cardunculus L. gasification

Effect of sepiolite bed material on gas composition and tar mitigation during C. cardunculus L. gasification

Agglomeration and Defluidization of Silica Sand and Bentonite Particles during Empty Fruit Bunch (EFB) Ash Addition in Bubbling Fluidized Bed (BFB) Processes

Effect of bed material density on the performance of steam gasification of biomass in bubbling fluidized beds

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