Characterization of ceramic composite membrane filters for hot gas cleaning

Jo, Young Min; Hutchison, R; Raper, Judy A

doi:10.1016/s0032-5910(96)03246-9

Cited by 49 publications

(28 citation statements)

References 2 publications

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“…Efficiencies of filtration of typical coal fired power station exhaust are claimed to be greater than those of titania and ash membranes, although greater variation in pressure drops was apparent in the ash membrane than in titania at typical gas flows. 49) The use of CFA as a raw material in ceramics is supported by the large volume of ceramic products produced and the large amounts of fly ash produced by thermal power stations. In addition, other similarities exist between fly ash and traditional raw materials: e.g.…”

Section: Ceramic Applicationsmentioning

confidence: 99%

Resource recovery from coal fly ash waste: an overview study

Jha

Matsuda

Miyake

2008

J. Ceram. Soc. Japan

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Coal fly ash (CFA) is a useful byproduct of the combustion of coal. It is composed primarily of almost perfectly spherical aluminosilicate glass particles. This spherical characteristic and other characteristics of CFA should be exploited, rather than simply using CFA as inert filler for construction. Unfortunately, the presence of carbon residues and high levels of heavy metals has so far limited the uses of CFA. Forced leaching methods have been used to improve the technical and environmentally friendly qualities of CFA, but these processes do not seem to be economically viable. Actually, CFA is a major source of Si and Al for the synthesis of industrial minerals. Potential novel uses of CFA, e.g., for the synthesis of ceramic materials, ceramic membrane filters, zeolites, and geopolymers, are reviewed in this article with the intention of exploring new areas that will expand the positive reuse of fly ash, thereby helping to reduce the environmental and economic impacts of CFA disposal.

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Section: Ceramic Applicationsmentioning

confidence: 99%

Resource recovery from coal fly ash waste: an overview study

Jha

Matsuda

Miyake

2008

J. Ceram. Soc. Japan

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“…The pressure drop increased linearly with increasing face velocity and higher temperatures led to large drops in pressure. 12 The pressure drop gradient at 420°C was 2.65 mmH 2 O/cm/sec, which was approximately 1.7 times higher than the gradient at room temperature. The large increase in pressure drop, which leads to flow resistance in field applications under high temperatures, must be taken into consideration when using the filter in a practical design.…”

Section: Characterization Of Ptfe/glass Fiber Filtermentioning

confidence: 80%

“…The fluidized sand bath contained alumina sand particles and ran at temperatures up to 450°C. 12 The cross section and surface morphology were observed using a field emission scanning electron microscope (FE-SEM; JSM-6701F, JEOL). The effects of thermal exposure on the filter were examined by a three-dimensional laser scanning microscope (VK-9710, KEYENCE) at a magnification of ϫ1000.…”

Section: Technical Papermentioning

confidence: 99%

Preparation and Characterization of Porous Composite Filter Medium by Polytetrafluoroethylene Foam Coating

Park

Lee

Kim

et al. 2010

Journal of the Air & Waste Management Association

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The high costs of ceramic and Teflon filter media for hot gas cleaning has limited their industrial applications. This paper presents a foam coating technology that can be used to produce an inexpensive and highly efficient filter for industrial applications. A new apparatus was designed and built that coats porous glass mats with liquid-phase polytetrafluoroethylene (PTFE). The machine generates bubbles, enables the formation of uniform micropores less than 45 m in diameter, and produces a product with air permeability greater than 5.5 cm 3 /cm 2

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“…By the way, the durability of ceramic filter decreases resulting from the depth filtration [7]. Some novel methods, such as composite ceramic membrane [8], have been made to improve its economics, but these disadvantages are still quite difficult to overcome. PTFE membrane is another typical gas filter media.…”

Section: Introductionmentioning

confidence: 99%

Filtration and regeneration behavior of polytetrafluoroethylene membrane for dusty gas treatment

Jiang

Zhang

Liu³

et al. 2008

Korean J. Chem. Eng.

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With micron talcum particles and nano-CaCO 3 powder as test dust, a series of experiments have been carried out to systematically study the gas filtration and regeneration behavior of polytetrafluoroethylene membrane, and some comparisons were made with common filter media. The experimental results showed that the PTFE membrane had a filtration efficiency of above 99.99% for micron particles, and excellent regeneration behavior was obtained, though a much higher initial pressure drop existed. Based on the results, it was concluded that the PTFE membrane is an excellent surface-filtration media for micron particles. Effects of operation parameters, including airflow velocity, particle concentration and particle characteristics were also investigated. To better understand the evolution of pressure drop during the filtration process, a mathematical model with operation parameters and characteristics of particles was derived from the gas-solid two-phase flow theories. A novel method on the determination of regeneration period of the filter media was put forward based on the analysis of the pressure drop according to this model.

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Characterization of ceramic composite membrane filters for hot gas cleaning

Cited by 49 publications

References 2 publications

Resource recovery from coal fly ash waste: an overview study

Resource recovery from coal fly ash waste: an overview study

Preparation and Characterization of Porous Composite Filter Medium by Polytetrafluoroethylene Foam Coating

Filtration and regeneration behavior of polytetrafluoroethylene membrane for dusty gas treatment

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