Impact of char and ash fines on porous ceramic filter life

Alvin, Mary Anne

doi:10.1016/s0378-3820(97)00088-x

Cited by 52 publications

(25 citation statements)

References 2 publications

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“…This configuration preseparated the coarser particles and sent only the very fine char to the filter which formed a denser cake that appeared to have sintered and was not removable by backpulsing. This phenomenon has also been observed in other hot gas filtering applications [9] where the cake is formed from a narrow particle size distribution of solids.…”

Section: Process Operation Experiencementioning

confidence: 73%

Removal of Residual Char Fines from Pyrolysis Vapors by Hot Gas Filtration

Scahill

Diebold

Feik

1997

Developments in Thermochemical Biomass Conversion

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An NREL-designed vortex reactor fast pyrolysis process development unit (PDU) has been used to investigate hot gas filtration of biomass pyrolysis vapors. Most of the experimental work employed a conventional baghouse type of filter that used NEXTEL™ ceramic cloth filter bags as the filter medium.A series of experimental runs demonstrated that hot gas filtered biocrude oils having less than 10 ppm of total alkali could be reproducibly made. Removal of the char cake from the filter elements proved to be a difficult problem. The char appears to become progressively more sintered to itself and the filter as a function of the cumulative biomass processed. Controlled oxidation does remove this dense char from the filters, but leaves residual ash on the filter cloth fibers. This ash may in turn cause subsequent biomass pyrolysis vapors that pass through the filter to produce additional char (coke) in the interstices of the filter cloth. Data are presented that suggest this char formation may contribute to a more rapid rise in the rate of filter blinding as measured by the increase in recovered filter pressure drop.

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Section: Process Operation Experiencementioning

confidence: 73%

Removal of Residual Char Fines from Pyrolysis Vapors by Hot Gas Filtration

Scahill

Diebold

Feik

1997

Developments in Thermochemical Biomass Conversion

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“…[1][2][3][4][5][6] For such application, the ceramic filters must be able not only to resist the chemical attack at high temperatures by the aggressive process environments containing steam, dust and gaseous sulfide, but also to withstand the mechanical strength decrease in the pulse-jet cleaning process. Due to the low thermal expansion coefficient, good thermal shock resistance, as well as excellent mechanical and chemical stability at elevated temperatures, porous SiC ceramics are thought to be the most promising filter material for hot gas filtration.…”

Section: Introductionmentioning

confidence: 99%

Effects of CeO2 addition on the properties of cordierite-bonded porous SiC ceramics

Liu

Zeng

Jiang

2009

Journal of the European Ceramic Society

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“…High-temperature gas filtration is a key technology for various combustion and power applications, for example, in automobiles 1 , advanced biomass-based gasifier engines 2 , and coal-fueled power-generation systems [3][4][5] . Open-porous ceramics with high physical and chemical stability are of importance for such applications, and are being intensively investigated [3][4][5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

Uniformly Porous Composites with 3‐D Network Structure (UPC‐3D) for High‐Temperature Filter Applications

Suzuki

Kondo

Ohji

et al. 2004

Int J Applied Ceramic Tech

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Uniformly porous composites with 3‐D network structure (UPC‐3D) have been recently developed via a pyrolytic reactive sintering process, which takes advantage of the evolved CO2 gas from a decomposing carbonate source (e.g., dolomite, CaMg(CO3)2) and does not require any additional pore‐forming agent nor long‐time burning‐out process. Through liquid formation via LiF doping, strong necks are formed between constituent particles before completion of the pyrolysis of carbonate, resulting in the formation of a strong 3‐D network structure. The pore size distribution is very narrow (with typical pore size: ∼1 μm), and the porosity was controllable (∼30–60%) by changing the sintering temperature. This article presents the development details of UPC‐3D, and reports the recent findings in CaZrO3/MgAl2O4 system, which will be one of the more promising systems for practical applications.

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Impact of char and ash fines on porous ceramic filter life

Cited by 52 publications

References 2 publications

Removal of Residual Char Fines from Pyrolysis Vapors by Hot Gas Filtration

Removal of Residual Char Fines from Pyrolysis Vapors by Hot Gas Filtration

Effects of CeO2 addition on the properties of cordierite-bonded porous SiC ceramics

Uniformly Porous Composites with 3‐D Network Structure (UPC‐3D) for High‐Temperature Filter Applications

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