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2001 Fiscal Year Final Research Report Summary

C0_2 selective EGR for Emission Reduction of Cogeneration Engine System

Research Project

Project/Area Number 12650206
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Thermal engineering
Research InstitutionThe University of Tokushima

Principal Investigator

MIWA Kei  The University of Tokushima, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (00026147)

Co-Investigator(Kenkyū-buntansha) MOHAMMADI Ali  The University of Tokushima, Graduate School of Engineering, Assistant, 大学院・工学研究科, 助手 (40314885)
KIDOGUCHI Yoshiyuki  The University of Tokushima, Faculty of Engineering, Lecturer, 工学部, 講師 (70294717)
HAYASHI Hiroshi  The University of Tokushima, Faculty of Engineering, Professor, 工学部, 教授 (00035627)
Project Period (FY) 2000 – 2001
KeywordsDiesel Combustion / Emission / CO2 / NOx / Smoke / Exhaust Gas Recirculation / Hydrocarbons
Research Abstract

Cogeneration systems offer a high overall efficiency and are environmentally friendly. In small-scale domestic Cogeneration systems, diesel engines are usually employed which have high thermal efficiency and emit a low amount of CO_2. However, NOx and particulate matter (PM) emitted from employed diesel engines are still serious environmental problems. In diesel engines, NOx can be reduced by retarding fuel injection timing and exhaust gas recirculation EGR. However, these methods end with an increase of PM. Purpose of this study is to reduce both NOx and PM of diesel engines using a CO_2 selective EGR system. In this method, CO_2 gas emitted from a diesel engine is chemically absorbed by K_2CO_3 in a flow reactor and then CO_2 is extracted from the reactor by steam flashing. Finally, extracted highly pure CO_2 gas is introduced into the intake air of engine. Using this method one can obtained a considerable NOx reduction with a low amount PM. In this work, at first a small-scale flow … More reactor was used to examine the CO_2 absorption by K_2CO_3 on activated carbon (300g K_2CO_3/1000g Carbon). Reactor with a length of 300mm and an inner diameter of 20mm, which is heated, at constant temperature of 100℃. In order to simulate the diesel exhaust, mixture of CO_2 and nitrogen gas (CO_2 : 11.8 %) is humidified by a saturator and heated at 100℃. Then the gas is supplied through a heated line to the reactor. The concentration of the CO_2 at outlet of the reactor was measured to check the chemical absorption of CO_2 by K_2CO_3. Effect of reactor temperature, gas flow rate and moisture concentration on CO_2 absorption was examined. It was found that reactor temperature of 100℃ offers the highest CO_2 absorption while in the range this experiment effect of the gas flow rate was small. In CO_2 extraction experiment, the absorbed CO_2 gas was extracted by flashing the reactor content by a highly humidified nitrogen gas. It was observed that the steam flashing at a temperature of about 190℃ gives the highest CO_2 extraction and steam flushing with a high flow rate shorten the extraction period. Above experiment shows that mentioned technique has a great potential to obtain a highly pure CO_2 gas for selective EGR. In the last step of experiment, CO_2 selective EGR in a direct injection diesel engine was performed by adding pure CO_2 into the intake air of the engine. It was observed that only 3 % of CO_2 addition into the intake air could provides a considerable reduction of NOx and PM. Less

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 中美 智子: "流動反応装置によるディーゼル燃料の熱分解と酸化過程に関する研究"燃焼研究. 126号. 39-50 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 林 弘: "化学的補足をを利用する湿性CO_2の高効率分離プロセス"月刊エコインダストリー. 第7巻,1号. 13-19 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kidoguchi Yoshiyuki: "Reduction Mechanism of NOx in Rich and High Turbulence Diesel Combustion"Proc. of 15^<th> symp. on Diagnostics and Modeling of Combustion in Internal Combustion Engines. 15-1-15-6 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] モハンマディ アリ: "ディーゼル燃焼におけるNOx生成過程に及ぼす噴射圧力と燃料組成の影響"自動車技術会論文集. vol.32, No.4. 23-28 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Mohammadi Ali: "Effect of Injection Parameters and Wall Impingement on Atomization and Gas Entrainment Processes in Diesel Sprays"Society Automotive Engineers (US) SAE. 2002-01-0497(発表予定). (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sugiyama Shigeru: "Effects of Gas-and Solid-Pase Additives on Oxidative Dehydrogenation of Propane on Strontium and barium Hydrodxyapatites"Applied Catalysis, A General. Vol.211, No.1. 123-130 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nakami Tomoko, Yoshiyuki Kidoguchi, Miwa Kei, Mohammadi Ali et al.: "lnvestigation of Thermal cracking and Oxidation of Diesel Fuel Using A Flow Reactor"Nensho Kenkyu. Vol.126, (in Japanese). 39-50 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hayashi Hiromu: "Efficient Recovery of Carbon Dioxide under Moist Conditions by the Reversible Chemical Reaction"Eco-lndustry. Vol.7, No. 1. 13-19 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kidoguchi Yoshiyuki, Kei Miwa and Ali Mohammadi,Ali.: "Reduction Mechanism of NOx in Rich and High Turbulence Diesel Combustion"15^<th> symp. On Diagnostics and Modeling of Combustion in Internal Combustion Engines. 15-1-6 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Mohammadi Ali, Miwa Kei and Yoshiyuki Kidoguchi: "Effects of Injection pressure and Fuel Properties on NOx Formation during Diesel Combustion"Transaction of JSAE. Vol.32, No. 4. 23-28 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Mohammadi Ali.: "Effect of Injection Parameters and Wall Impingement on Atomization and Gas Entrainment Processes in Diesel Sprays"Society of Automotive Engineer 2000. 2002-01-0497 (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Sugiyama Shigeru, Hayashi Hiromu et al.: "Effects of Gasand Solid-Pase Additives on Oxidative Dehydrogenation of Propane on Strontium and barium Hydroxyapatites"Applied Catalysis, A General. Vol.211, No. 1. 123-130 (2001)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2003-09-17   Modified: 2021-04-07  

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