• Title/Summary/Keyword: Bag-Filter

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CFD Analysis on the Flow in the Connection Duct of the Cyclone-Bag Hybrid Dust Collector (사이클론-백 하이브리드형 집진장치에서 유동연결부 설계조건에 따른 유동균일성 전산해석)

  • Koo, Seongmo;Oh, Wonchul;Chang, Hyuksang
    • Particle and aerosol research
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    • v.12 no.4
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    • pp.115-126
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    • 2016
  • Numerical analysis was done to evaluate the movement of the particles and the fluid inside of the cyclone-bag hybrid dust collector. Flow discharged from the cyclone in the hybrid particle collector has swirl pattern, and it results in the biased flow to the bag filters and deteriorates the collection performance of the bag filter. The current study is to evaluate the effect of the duct lengths and the baffle arrays in the connection duct by the computational methods. Main concerns of the analysis are how to improve the uniformity of the internal flow between the cyclone and the bag filter. Numerical analysis was done to check the particle removal efficiencies of the system with respect to the flow characteristics which is expressed in RMS values of the upward flow inside of the connection duct. The flow pattern inside of the connection duct is evaluated under different the duct lengths and the baffle arrays. In case of the reference geometry the RMS value of inside flow was 56.7%, and the value was decreased to 30.1% by controlling the lengths of duct. The effects of baffle was also evaluated, the RMS value of flow could be decreased 55.2% and so on. But the pressure drop across the baffles becomes high and the system efficiency becomes lower.

Study on Filter Drag Due to the Change of Operation Conditions in a Pulse Air Jet-type Bag Filter[I] (충격기류식 여과집진장치에서 운전조건 변화로 인한 여과저항에 관한 연구[I])

  • Ryu, Jae-Yong;Suh, Jeong-Min;Park, Jeong-Ho;Jeon, Bo-Kyung;Choi, Kum-Chan;Son, Yoyng-Il
    • Journal of Environmental Science International
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    • v.16 no.4
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    • pp.449-458
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    • 2007
  • Research results for the pressure drop variance depending on operation conditions such as change of inlet concentration, pulse interval, and face velocity, etc., in a pulse air jet-type bag filter show that while at $3kg/cm^2$ whose pulse pressure is low, it is good to make an pulse interval longer in order to form the first layer, it may not be applicable to industry because of a rapid increase in pressure. In addition, the change of inlet concentration contributes more to the increase of pressure drop than the pulse interval does. In order to reduce operation costs by minimizing filter drag of a filter bag at pulse pressure $5kg/cm^2$, the dust concentration should be minimized, and when the inlet dust loading is a lower concentration, the pulse interval in the operation should be less than 70 sec, but when inlet dust loading is a higher concentration, the pulse interval should be below 30 sec. In particular, in the case that inlet dust loading is a higher concentration, a high-pressure distribution is observed regardless of pulse pressure. This is because dust is accumulated continuously in the filter bag and makes it thicker as filtration time increases, and thus the pulse interval should be set to below 30 sec. If the equipment is operated at 1m/min of face velocity, while pressure drop is low, the bag filter becomes larger and thus, its economics are very low due to a large initial investment. Therefore, a face velocity of around 1.5 m/min is considered to be the optimal operation condition. At 1.5 m/min considered to be the most economical face velocity, if the pulse interval increases, since the amount of variation in filter drag is large, depending on the amount of inlet dust loading, the operation may be possible at a lower concentration when the pulse interval is 70 sec. However, for a higher concentration, either face velocity or pulse interval should be reduced.

Simultaneous Treatment of Tar and Particles Using Oil Scrubber and Bag Filter in Biomass Gasification (오일 스크러버 및 집진장치를 통한 바이오매스 가스화 공정 발생 타르 및 입자 제거 연구)

  • Kim, Joon Yub;Jo, Young Min;Kim, Sang Bum
    • Applied Chemistry for Engineering
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    • v.30 no.6
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    • pp.712-718
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    • 2019
  • A combustible producer gas composed of H2, CO and CH4 could be obtained by the thermal-chemical conversion of biomass. However, a large amount of particulate matters including tar generated causes the mal-function of turbines and engines or the fouling of pipelines. In this study, a wet scrubber using the soybean oil and bag filter were installed, and the removal efficiency was investigated. Hydrate limestone and wood char base activated carbon were pre-coated on the filter medium to prevent clogging of open pores. The removal efficiencies by the bag filter were 86 and 80% for the hydrated limestone and activated carbon coating, respectively. Overall, the collection when using a series of oil scrubbers and bag filters were 88%, while 83% for the filter coating material.

막분리공정을 이용한 용수처리

  • 김해수
    • Proceedings of the Membrane Society of Korea Conference
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    • 1993.06a
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    • pp.83-95
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    • 1993
  • 현재 존재하는 다양한 filtration 테크놀러지는 feed stream으로부터 제거되는 파티클의 사이즈에 근거하여 그 범주를 정할 수 있다. 부유 고체물의 재래식 macrofiltration 은 feed solution이 수직 방향으로 filter media을 통하여 흐르게끔 하는 것이다. 전체 용액은 메디아를 통하여 지나가는데 단지 한개의 stream만 만든다. 그런 여과 장채의 보기를 들면, cartridge, filter, bag filter, sand filter, multimedia filter들이 있다. Macrofiltration separation은 1 미크론 이상가는 비용해성 파티클에 국한된다.

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Removal of HCl Using a Bag-Filter with Addition of Bicarbonate (중탄산나트륨이 첨가된 여과집진기를 이용한 염화수소의 제거)

  • Lee, Keon-Joo
    • Journal of the Korea Organic Resources Recycling Association
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    • v.15 no.3
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    • pp.121-128
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    • 2007
  • The purpose of this study was to investigate the removal efficiencies of HCl in dry reactor and Bag-Filter system. The bicarbonate was used as adsorbent to measure the HCl removal rate. The performance of bicarbonate was evaluated to investigate the removal efficiency. It was analysed that the best operation condition in using bicarbonate in process. The operating parameters was residence time, stoichiometric ratio, temperature and pressure. The Residence time was 1.5 sec, stoichiometric ratio was 1SR, 1.25SR, temperature was $160^{\circ}C$, $180^{\circ}C$, $200^{\circ}C$ and the bag filter pressure was 210mmAq, 230mmAq, 250mmAq. In this study it was found that the stoichiometric ratio and pressure can be effected in removal of HCl however the removal efficiency do not depends on temperature. The best operating condition was on 1SR, 230mmAq and $180^{\circ}C$ respectively and in this condition the best removal rate was 99.50%.

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