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

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.

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

Advanced Materials Research ◽

10.4028/scientific5/amr.455-456.974 ◽

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 ◽

Heavy Duty ◽

Heavy Duty Diesel Engine ◽

Heavy Duty Diesel ◽

Emission Limits ◽

Scr System

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

Catalysts ◽

10.3390/catal10111269 ◽

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.

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