Reduction of NOx and CO Emissions in Stoichiometric Diesel Combustion Using a 3-Way Catalyst

2009 ◽  
Author(s):  
Junghwan Kim ◽  
Rolf D. Reitz ◽  
Sung Wook Park ◽  
Kian Sung
Keyword(s):  
Gasoline Engine ◽  
Injection Pressure ◽  
Combustion Efficiency ◽  
Boost Pressure ◽  
Nox Emissions ◽  
Diesel Combustion ◽  
Simultaneous Reduction ◽  
Lean Combustion ◽  
Numerical Studies ◽  
Reduction Of Nox

Experimental and numerical studies were performed to investigate the simultaneous reduction of NOx and CO for stoichiometric diesel combustion with a 3-way catalyst. A single-cylinder engine was used for the experiments and KIVA simulations were used in order to characterize the combustion efficiency and emissions of throttled stoichiometric diesel combustion at 0.7 bar boost pressure and 90MPa injection pressure. In addition, the efficiency of emission conversion with the 3-way catalysts in stoichiometric diesel combustion was investigated experimentally. The results showed CO and NOx emissions can be controlled with the 3-way catalyst in spite of the fact that CO increases more at high equivalence ratios compared to conventional diesel combustion (i.e., lean combustion). At stoichiometric operation, the 3-way catalyst reduced CO and NOx emissions by up to 95%, which achieves lower emissions compared to conventional diesel combustion or low temperature diesel combustion, while keeping better fuel consumption than a comparable gasoline engine.

Reduction in NOx and CO Emissions in Stoichiometric Diesel Combustion Using a Three-Way Catalyst

2010 ◽  
Vol 132 (7) ◽  
Author(s):  
Junghwan Kim ◽  
Rolf D. Reitz ◽  
Sung Wook Park ◽  
Kian Sung
Keyword(s):  
Gasoline Engine ◽  
Injection Pressure ◽  
Combustion Efficiency ◽  
Boost Pressure ◽  
Nox Emissions ◽  
Diesel Combustion ◽  
Simultaneous Reduction ◽  
Lean Combustion ◽  
Numerical Studies ◽  
Three Way Catalyst

Experimental and numerical studies were performed to investigate the simultaneous reduction in NOx and CO for stoichiometric diesel combustion with a three-way catalyst. A single-cylinder engine was used for the experiments and KIVA simulations were used in order to characterize the combustion efficiency and emissions of throttled stoichiometric diesel combustion at 0.7 bar boost pressure and 90 MPa injection pressure. In addition, the efficiency of emission conversion with three-way catalysts in stoichiometric diesel combustion was investigated experimentally. The results showed CO and NOx emissions can be controlled with the three-way catalyst in spite of the fact that CO increases more at high equivalence ratios compared with conventional diesel combustion (i.e., lean combustion). At a stoichiometric operation, the three-way catalyst reduced CO and NOx emissions by up to 95%, which achieves lower emissions compared with conventional diesel combustion or low temperature diesel combustion, while keeping better fuel consumption than a comparable gasoline engine.

Investigations of a Staged Fuel Nozzle for Aeroengines by Multi-Sector Combustor Test

2010 ◽  
Author(s):  
Takeshi Yamamoto ◽  
Kazuo Shimodaira ◽  
Yoji Kurosawa ◽  
Seiji Yoshida ◽  
Kazuaki Matsuura
Keyword(s):  
Nox Reduction ◽  
Combustion Efficiency ◽  
Nox Emissions ◽  
Fuel Injectors ◽  
Middle Power ◽  
Fuel Staging ◽  
Annular Combustor ◽  
Fuel Nozzle ◽  
Reduction Of Nox ◽  
Conducting Research

The reduction of NOx emissions from aeroengines is very important to protect the local air quality near the airports and prevent the climate change. ICAO CAEP has been stepped up the NOx standard frequently. Therefore, the engine manufacturers and national research institutes are actively working on the low-NOx technologies to meet the lower NOx emissions standard. JAXA is conducting research and development of the aeroengine technologies for the environmental adaptation in the TechCLEAN project. As a part of the project, combustion technologies have been developed with an aggressive target that is an 80% NOx reduction of CAEP/4. For the drastic reduction of NOx emissions, the fuel nozzles were designed based on the lean staged combustion concept. At first, five fuel nozzles were tested in a single-sector combustor at LTO cycle conditions of small aeroengine and it was confirmed that one fuel nozzle enabled 72% NOx reduction of CAEP/4. This lean low NOx fuel nozzle was tested in the present work in a multi-sector combustor at the same conditions with the single-sector combustor test. Test results showed that the combustor had combustion characteristics enabling 70% NOx reduction of CAEP/4, which was almost same with the single-sector combustor. For the improvement of combustion efficiency at middle power conditions, fuel staging among the main fuel injectors was also investigated at the MCL condition. The results showed that the fuel staging among the main fuel nozzles is effective to improve the combustion efficiency of the annular combustor.

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