• Title/Summary/Keyword: Ceramic Candle Filter

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A study on Ash size and its distribution on cleaning of ceramic candle filter (세라믹캔들필터 집진 전후 Ash의 크기 및 분포에 관한 연구)

  • Jeong, Jin-Do;Lee, Jung-Beom;Kim, Jong-Yeong
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.20 no.5
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    • pp.1639-1648
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    • 1996
  • Protection of gas turbine blade from its erosion and abrasion at high temperature and pressure is the first goal to cleanup the hot gas upstream for IGCC and PFBC. Ceramic filters represent an attractive technology for particle removal at high temperature and high pressure condition. They have demonstrated being a good system for improvement of thermal efficiency and reduction of effluent pollutants in advanced coal-based power systems such as IGCC and PFBC. Ceramic filter elements currently being developed were evaluated in the previous paper. In this paper, we measured the ash size and distribution on cleaning of ceramic candle filter. The results are as follows : in this experimental range, ceramic candle filter was shown to be fully adequate for the removal process of dust under high temperature and pressure. Also filtration efficiency of ceramic candle filter was higher than 98% compared with the regulation limit of particle size in gas turbine inlet.

Removal of NO Using CuO/3Al2O3 · 2SiO2 Catalyst Impregnated Ceramic Candle Filters (산화구리 촉매담지 세라믹 캔들필터를 이용한 NO 제거)

  • 홍민선;문수호;이재춘;이동섭
    • Journal of Korean Society for Atmospheric Environment
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    • v.20 no.3
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    • pp.291-302
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    • 2004
  • The CuO/$3AL_2O_3{\cdot}2SiO_2$ catalyst impregnated ceramic candle filters for nitrogen oxides removal were prepared by porous mullite($3AL_2O_3{\cdot}2SiO_2$) support and CuO catalyst deposited on this support to achieve uniformly dispersed CuO deposition, which are impregnated into the pores of available alumino-silicate ceramic candle filter. The CuO/3$AL_2O_3{\cdot}2SiO_2$ catalyst impregnated ceramic candle filters were characterized by XRD, BET, air permeability, pore size, SEM and catalytic tests in the reduction of NOx by NH$_3$. The observed effects of CuO/3$AL_2O_3{\cdot}2SiO_2$ impregnated ceramic candle filters in SCR reaction are as follows : (1) when the content of CuO catalyst increased further, activity of NO increased. (2) NO conversion at first increased with temperature and then decreased at high temperatures (above 40$0^{\circ}C$), possibly due to the occurrence of the ammonia oxidation reaction. (3) In pilot plant test for 3 months, NO conversion was greater than 90%.

Removal Technology of NOx Using V2O5/TiO2 Catalyst Impregnated Ceramic Candle Filters (바나디아 촉매담지 세라믹 캔들필터를 이용한 질소산화물 제거기술)

  • Lee, Dong-Sub;Park, Jin-Sick
    • Journal of Environmental Science International
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    • v.16 no.9
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    • pp.1077-1083
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    • 2007
  • [ $V_2O_5/TiO_2$ ] catalyst impregnated ceramic candle filters are in principle, capable of performing shallow-bed dust filtration plus a catalytic reaction, promoted by a catalytic deposited in their inner structure. Pilot-scale $V_2O_5/TiO_2$ catalyst impregnated ceramic candle filters were prepared, characterized and tested for their activity towards the SCR reaction. The effect on NO conversion of operating temperature, gas hourly space velocity, amount of deposited catalyst, pressure drops and long-term experiment (life of catalytic filter) was determined. The following effects of $V_2O_5/TiO_2$ catalyst impregnated ceramic candle filters in SCR reaction are observed: (1) It increases the activity and widens the temperature window for SCR. (2) When the content of $V_2O_5$ catalyst increases further from 3 to 9wt.%, activity of NO increases. (3) NO conversion at first increases with temperature and then decreases at high temperatures (above $400^{\circ} over), possibly due to the occurrence of the ammonia oxidation reaction.

Fabrication and Properties of the SiC Candle Filter by Vacuum Extrusion and Ramming Process (진공 압출성형 및 래밍성형 공정에 의한 탄화규소 캔들 필터 제조 및 특성)

  • Shin, Myung-Kwan;Han, In-Sub;Seo, Doo-Won;Kim, Se-Young;Woo, Sang-Kuk;Lee, Seoung-Won;Kim, Young-Wook
    • Journal of the Korean Ceramic Society
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    • v.46 no.6
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    • pp.662-667
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    • 2009
  • Porous SiC candle filter preforms were fabricated by extrusion and ramming process. To fabricate SiC candle filter preform, commercially available 85 ${\mu}m\;{\alpha}-$-SiC powder and 44 ${\mu}m$ mullite, CaC$O_3$ powder were used as the starting materials. The candle type preforms were fabricated by vacuum extrusion and ramming process, and sintered at $1400{^{\circ}C}$ 2 h in air atmosphere. The effect of forming method on porosity, density, strength (flexural and compressive strength) and microstructure was investigated. Also, corrosion test of the sintered candle filter specimens as forming method was performed at $600{^{\circ}C}$ in IGCC syngas atmosphere. The sintered SiC filter which was formed by ramming process has more higher density and exhibit higher strength than extruded filter. Its maximum density and 3-point bending strength were 2.00 g/$cm^3$ and 45 MPa, respectively.

Fabrication and Properties of SiC Candle Filter by Vacuum Extrusion and Ramming Process (II) (진공 압출성형 및 래밍성형 공정에 의한 탄화규소 캔들 필터 제조 및 특성 (II))

  • Han, In-Sub;Seo, Doo-Won;Kim, Se-Young;Hong, Ki-Seog;Woo, Sang-Kuk;Kim, Young-Wook
    • Journal of the Korean Ceramic Society
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    • v.47 no.6
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    • pp.515-523
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    • 2010
  • Porous SiC candle filter preforms were fabricated by extrusion and ramming process. To fabricate SiC candle filter preform, commercially available F180 mesh ($85\;{\mu}m$) $\alpha$-SiC powder and $44\;{\mu}m$ mullite, $CaCO_3$ powder were used as the starting materials. The candle type preforms were fabricated by vacuum extrusion and ramming process, and sintered at $1400^{\circ}C$ 2 h in air atmosphere. Corrosion test of the sintered candle filter specimens as forming method was performed at $600^{\circ}C$ for 2,400 h in simulated IGCC syngas atmosphere. The effect of forming method on mechanical properties, pore distribution, microstructure and crystalline phase was investigated.

Measurements of Dust Velocity Field around the Ceramic Candle Filter (세라믹 캔들 필터 주위의 분진 속도분포 측정)

  • Ko, Yong-Seo;Chung, Jin-Do;Kim, Seung-Tea
    • Clean Technology
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    • v.5 no.1
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    • pp.30-41
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    • 1999
  • The experimental set-up with a 1m long ceramic candle filter of Schumacher(Germany) was built in this work. The dust velocity field around the filter was measured using PDPA. The effects of dust cake layer and dust inlet position on the dust velocity field were also analyzed. It was found that the filtration velocity decreases as the dust cake builds up on the filter. The filtration velocity largely decreases around the filters near the dust inlet since the dust cake develops fast there. The average dust velocity on the filter due to the pressure difference through the filter was measured to be 0.28m/s. More uniform dust velocity field around the filter was obtained when feeding dust in a lower position of the pressure vessel.

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Comparison Research of Filtration and Regeneration Characteristics of Ceramic Candle Filter System at Different Inflow Pattern of Dusty Gas (분진 유입 방식에 따른 세라믹 캔들 필터 집진장치의 집진 및 탈진 특성 비교 연구)

  • Park, Seok-Joo;Lim, Kyeong-Soo;Lim, Jeong-Hwan
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.05a
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    • pp.341-344
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    • 2008
  • Computational studies have been performed to analyze the particle loadings onto the filters according to the different inflow pattern of dusty gas and the flow uniformities on the filter surface of back-blown gas at different permeability of porous media setup at the filter outlet. This is preliminary study to find how we can reduce the regeneration time and improve the regeneration efficiency of filters with dust layer.

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Development of Filtration System for Korean Model IGCC Demonstation Plant (한국형 IGCC 대용량 집진시스템 개발)

  • Park, Seok-Joo;Lim, Kyeong-Soo;Lim, Jeong-Hwan
    • 한국신재생에너지학회:학술대회논문집
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    • 2007.06a
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    • pp.812-815
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    • 2007
  • Computational simulation has been performed to design the filtration system for Korea model IGCC demonstration plant. The filtration system for optimal design has four effective filters corresponding to the clusters composed of a group of ceramic candle filters. It was analyzed how the different entrance geometry influences the flow field and the particle behavior in the filtration system. The particle loading is minimum when the gas mixed with particles flows into the filter vessel with a shroud tube through a tangential inlet. However, the particle loading is maximum when the gas with particles enters the filter vessel through a normal inlet which a entrance tube extended from. By controling adequately both conditions of inflow, the filtration system can be operated optimally to prolong the filter life-time and to save the energy for cleaning filters.

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Performance of a Group Candle Filter in a Hot Bench Unit

  • Park, Joo-Hong;Park, Gyung-Won
    • Journal of Energy Engineering
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    • v.8 no.1
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    • pp.143-149
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    • 1999
  • The mounting technology of ceramic candle elements utilizing disk spring was tested in a hot bench unit. Seven SiC candle elements were fixed in three groups by 2, 2, and 3 elements per group. And its performance was investigated in a hot gas stream using oil burned-exhaust gas. The experimental results showed that this mounting method gave a good performance enough to be useful for the particulate removal in the integrated gasification combined cycle (IGCC). Some operational characteristics of the groupfilter were observed.

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Difference of Pressure Drop through Ceramic Candle Filter System for IGCC according to Inflow and Regeneration Conditions (IGCC용 세라믹캔들필터 집진장치에서의 가스 유입 및 탈진 조건에 따른 차압 특성 변화)

  • Park, Seok-Joo;Lim, Kyeong-Soo;Lim, Jeong-Hwan
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.10a
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    • pp.246-249
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    • 2008
  • IGCC (석탄가스화 복합발전) 시스템 공정 중 가스화기에서 발생되는 합성가스 내에는 높은 농도의 분진들이 함유되어 있기 때문에 하부 공정들을 보호하기 위해서는 가스화기 후단에 집진장치가 필히 설치되어야 한다. 집진장치의 설계 제작 운전에 있어서 점착성 분진층 부착,분진 브리징, 필터 파손 현상 등과 같은 다양한 문제점들로 인하여 고온의 합성가스를 처리하는 데는 아직 기술적 한계들이 산재해 있는 상황이다. 이와 같은 문제점들은 필터에 부착된 분진층의 탈진성능을 향상시키거나, 필터의 열피로를 줄일 수 있도록 필터 재생을 위한 탈진의 횟수를 줄이는 방법을 통하여 해결될 수 있다. 본 연구에서는 파일롯 규모의 IGCC용 세라믹캔들필터 집진장치에서의 가스 유입 및 탈진 조건에 따른 집진장치의 차압 특성 변화를 수치해석과 실험을 통하여 분석함으로써 탈진성능을 향상시킬 수 있는 조건과 탈진 횟수를 최소화시킬 수 있는 방안을 도출하고자 하였다.

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