• Title/Summary/Keyword: 촉매코팅 매연 여과 장치

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An Experimental Study on Regeneration Characteristics of Catalyzed Diesel Particulate Filter with Variation of Exhaust Gas Temperature and Composition (배기가스 온도 및 조성 변화에 따른 CDPF의 재생 특성에 관한 실험적 연구)

  • Cho, Yong-Seok;Lee, Jung-Sub;Yoon, Yu-Bin;Park, Young-Joon;Lee, Seang-Wock
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.32 no.8
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    • pp.597-603
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    • 2008
  • The catalyzed diesel particulate filter (CDPF) is widely used for collecting soot from the exhaust gas of diesel engine. However, the CDPF need being regenerated after the soot accumulation. It is important to know characteristics of regeneration for CDPF with variation of exhaust gas temperature and composition. This study presents characteristics of regeneration according to variable exhaust gas composition. Furthermore, the experiment were performed variable gas temperature of CDPF inlet gas at each exhaust gas composition. Test-rig is used to control at each in let gas temperature and composition during regeneration of CDPF. Reaction intensity($I_c$) is used to compare with each result. Experimental results indicated that increased concentration of $NO_x$ and $O_2$ lead to regenerate more greatly. Also, higher temperature of exhaust gas leads to make CDPF cleaner.

An Experimental Study on Effects of Soot Loading and Mass Flow Rate on Pressure Drop and Heat Transfer in Catalyzed Diesel Particulate Filter (촉매 코팅 DPF의 soot loading과 유량 변화에 따른 압력강하 및 열전달에 관한 실험적 연구)

  • Cho, Yong-Seok;Noh, Young-Chang;Park, Young-Joon;Kim, Duk-Sang
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.3
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    • pp.72-78
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    • 2007
  • A diesel particulate filter causes progressive increase in back pressure of an exhaust system due to the loading of soot particles. To maintain the pressure drop caused by DPF under proper level, a regeneration process is mandatory when excessive loading of soot is detected in the filter. It is a major reason why the relation between the amount of soot and the pressure drop in a DPF becomes crucial. On the other hand, pressure drop varies with not only the soot loading but also conditions of exhaust gas such as mass flow rate. Therefore, the relation among them becomes complicated. Furthermore, the characteristics of heat transfer in a DPF is another crucial parameter in order for the filter to avoid thermal crack during regeneration period. This study presents characteristics of pressure drop under various conditions of soot loading and mass flow rate in catalyzed diesel particulate filter. This study also shows characteristics of heat transfer in DPF when high temperature gas flows into the filter. Experiments reveal that the soot loading and mass flow rate affect characteristics pressure drop independently. Experiments also indicate that the amount of coating material has little influence on pressure drop with changes in soot loading and mass flow rate. However, increased catalyst coating may lead to the improved heat transfer which is efficiency to reduce thermal stress of the filter.

An Experimental Study on Regeneration Characteristics by Variation of Exhaust Gas Temperature, HC and $O_2$ Concentrations on DOC-CDPF System (배기가스의 온도 및 HC와 $O_2$의 조성 변화에 따른 DOC-CDPF의 재생 특성에 관한 실험적 연구)

  • Cho, Yong-Seok;Lee, Seang-Wock;Lee, Jung-Sub;Yoon, Yu-Bin;Park, Young-Joon
    • Transactions of the Korean Society of Automotive Engineers
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    • v.17 no.1
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    • pp.43-49
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    • 2009
  • A catalyzed diesel particulate filter (CDPF) causes the progressive increase in back pressure of an exhaust system due to the loading of soot particles. To minimize pressure drop which is generated by CDPF, the filter should be regenerated when it collects a certain quantity of soot. It is important to know characteristics of regeneration of CDPF with various of exhaust gas temperatures and compositions. The oxidation of HC in DOC leads to increase gas temperature of DOC downstream. The increased gas temperature by DOC has an positive effect on CDPF regeneration. This study presents characteristics of regeneration of CDPF with DOC according to various gas composition, such as HC and $O_2$ concentration. The test-rig is used to control each gas composition and temperature during regeneration of CDPF. Experimental results indicate that the increased concentration of $O_2$ regenerates DPF more actively. With increasing HC concentration, the gas temperature of CDPF upstream increased due to more oxidation of HC. But excessive supply of HC leads to decrease of $O_2$ concentration in the CDPF, which makes it hard to regenerate CDPF.