A Study on the NOx Reduction of Urea-Selective Catalytic Reduction(SCR) System in a Heavy-Duty Diesel Engine

2007 ◽  
Author(s):  
lneok Cho ◽  
Seangwock Lee ◽  
Hoin Kang ◽  
Doo Sung Baik
Keyword(s):  
Diesel Engine ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Nox Reduction ◽  
Heavy Duty ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel ◽  
Scr System

scholarly journals Investigation of Urea Uniformity with Different Types of Urea Injectors in an SCR System

Catalysts ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1269
Author(s):  
Muhammad Khristamto Aditya Wardana ◽  
Kwangchul Oh ◽  
Ocktaeck Lim
Keyword(s):  
Diesel Engine ◽  
Catalytic Reduction ◽  
Nox Reduction ◽  
Heavy Duty ◽  
Ammonia Gas ◽  
Experimental Parameters ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel ◽  
Scr System

Heavy-duty diesel engines in highway use account for more than 40% of total particulate and nitrogen oxide (NOx) emissions around the world. Selective catalytic reduction (SCR) is a method with effective results to reduce this problem. This research deals with problems in the urea evaporation process and ammonia gas distribution in an SCR system. The studied system used two types of urea injectors to elucidate the quality of ammonia uniformity in the SCR system, and a 12,000-cc heavy-duty diesel engine was used for experimentation to reduce NOx in the system. The uniformity of the generated quantities of ammonia was sampled at the catalyst inlet using a gas sensor. The ammonia samples from the two types of urea injectors were compared in experimental and simulation results, where the simulation conditions were based on experimental parameters and were performed using the commercial CFD (computational fluid dynamics) code of STAR-CCM+. This study produces temperatures of 371 to 374 °C to assist the vaporization phenomena of two injectors, the gas pattern informs the distributions of ammonia in the system, and the high ammonia quantity from the I-type urea injector and high quality of ammonia uniformity from the L-type urea injector can produce different results for NOx reduction efficiency quality after the catalyst process. The investigations showed the performance of two types of injectors and catalysts in the SCR system in a heavy-duty diesel engine.

A Study on Nox Reduction of SCR System in Heavy-Duty Diesel Engine to Achieve the Euro V Emission Limits

2012 ◽  
Vol 455-456 ◽  
pp. 974-980
Author(s):  
Xin Yun Zhi ◽  
Li Ping Huang ◽  
Hai Long Pang ◽  
Chun Run Zhang ◽  
Hao Li ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Nox Reduction ◽  
Experimental Studies ◽  
Test Results ◽  
Heavy Duty ◽  
Reduction Efficiency ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel ◽  
Emission Limits ◽  
Scr System

This paper presents the experimental studies on an SCR system for a mobile heavy-duty diesel engine to reduce NOx emission below Euro V emission limits. The test results obtained by one engine serving in China show that NOx emission was reduced to 1.81 g/kWh with ESC and 1.66 g/kWh with ETC, the reduction efficiency of NOx was reduced by about 80%, while the average NH3 slip is kept below 6 ppm.

The Study of NOx Reduction Using Plasma-assisted SCR System for a Heavy Duty Diesel Engine

2011 ◽  
Author(s):  
Shinya Sato ◽  
Yoshihiro Kawada ◽  
Satoshi Sato ◽  
Mitsuru Hosoya ◽  
Akira Mizuno
Keyword(s):  
Diesel Engine ◽  
Nox Reduction ◽  
Heavy Duty ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel ◽  
Scr System

Effects of a zeolite-selective catalytic reduction system on comprehensive emissions from a heavy-duty diesel engine

2018 ◽  
Author(s):  
Z. Gerald Liu ◽  
Devin R. Berg ◽  
James J. Schauer‡
Keyword(s):  
Diesel Engine ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Oxidation Catalyst ◽  
Heavy Duty ◽  
Aftertreatment System ◽  
Selective Catalytic Reduction System ◽  
Reduction System ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel

The effects of a zeolite urea-selective catalytic reduction aftertreatment system on a comprehensive spectrum of chemical species from diesel engine emissions were investigated in the present study. Representative samples were collected with a newly developed source dilution sampling system after an aging process designed to simulate atmospheric dilution and cooling conditions. Samples were analyzed with established procedures and compared between the measurements taken from a baseline heavy-duty diesel engine and also from the same engine equipped with the exhaust aftertreatment system. The results have shown significant reductions for nitrogen oxides, carbon monoxide, total hydrocarbons, polycyclic aromatic hydrocarbons, and organic carbon emissions. Additionally, less significant yet notable reductions were observed for particulate matter mass and metals emissions. Although two ionic compounds, sulfate and nitrate, displayed increased emission levels, the production of new species was not observed with the addition of the zeolite urea-selective catalytic reduction system joined with a downstream oxidation catalyst.

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