Experimental demonstration of NOx reduction and ammonia slip for diesel engine SCR system

2021 ◽  
Author(s):  
Guangzhao Yue ◽  
Tao Qiu ◽  
Yan Lei
Keyword(s):  
Diesel Engine ◽  
Nox Reduction ◽  
Experimental Demonstration ◽  
Ammonia Slip ◽  
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

Improving the NOx reduction performance of an Euro VI d SCR System in real-world condition via nonlinear model predictive control

2021 ◽  
pp. 146808742110662
Author(s):  
Alberto Petrillo ◽  
Maria Vittoria Prati ◽  
Stefania Santini ◽  
Francesco Tufano
Keyword(s):  
Model Predictive Control ◽  
Predictive Control ◽  
Nonlinear Model ◽  
Real World ◽  
Nox Reduction ◽  
Nonlinear Model Predictive Control ◽  
Feed Ratio ◽  
Real World Data ◽  
Ammonia Slip ◽  
Scr System

This paper deals with the possibility of improving the urea dosage control for the Selective Catalytic Reduction Systems (SCR) of an Euro VI d diesel light commercial vehicle in order to increase [Formula: see text] after-treatment reduction performance. To this aim, first, we assess the effective emissions abatement performance for the appraised diesel vehicle via real-world experimental campaign, carried out according to the Real Driving Emissions (RDE) tests on urban, extra-urban and motorway road sections in Naples, Italy. Based on these real-world data, we derive a parameterized control-oriented model for the SCR system which is, then, exploited for the designing of an alternative urea injection logic which could be able to maximize the [Formula: see text] reduction efficiency while minimizing tailpipe ammonia slip. Specifically, the optimal AdBlue injection rate is designed according to a Nonlinear Model Predictive Control Approach which allows obtaining a proper trade-off between the [Formula: see text] abatement and the urea overdosing problem. The effectiveness of the proposed controller is evaluated by comparing the performance assessed for the appraised SCR system during the experimental tests with the ones achievable if the Euro VI diesel would be equipped with the proposed control strategy. Numerical simulation discloses the effectiveness of the NMPC controller in ensuring improved [Formula: see text] reduction with performance complying with the emissions norms, main in avoiding excessive ammonia slip and in guaranteeing a reduced feed ratio w.r.t. to the standard industrial SCR controller mounted on the vehicle.

Design and Development of a Low Cost SCR System for NOx Reduction in a Diesel Engine

2019 ◽  
Author(s):  
Shamil Backer O ◽  
Akshay B P ◽  
Shameem K ◽  
Sharun K K ◽  
Pradeep V
Keyword(s):  
Diesel Engine ◽  
Low Cost ◽  
Nox Reduction ◽  
Design And Development ◽  
Scr System

Improvement of NOX Reduction Rate of Urea SCR System Applied for an Non-Road Diesel Engine

2019 ◽  
Vol 20 (6) ◽  
pp. 1153-1160 ◽  
Author(s):  
Joonsoo Han ◽  
Taemin Kim ◽  
Haksup Jung ◽  
Sukang Pyo ◽  
Gyubaek Cho ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Nox Reduction ◽  
Reduction Rate ◽  
Scr System

Adaptive and Efficient Ammonia Storage Distribution Control for a Two-Catalyst Selective Catalytic Reduction System

2011 ◽  
Vol 134 (1) ◽  
Author(s):  
Ming-Feng Hsieh ◽  
Junmin Wang
Keyword(s):  
Catalytic Reduction ◽  
Nox Reduction ◽  
Injection Rate ◽  
Nox Emissions ◽  
System A ◽  
Ammonia Slip ◽  
Ammonia Storage ◽  
In Series ◽  
Storage Distribution ◽  
Scr System

This paper presents an adaptive urea-SCR dosing control design for a two-catalyst SCR system. A novel SCR ammonia storage distribution control (ASDC) approach aiming to simultaneously increase the SCR NOx conversion efficiency and reduce the tailpipe ammonia slip was proposed and experimentally validated. Based on the insight into SCR operational principles, a high ammonia storage level at the upstream part of the catalyst can generally yield a higher NOx reduction efficiency while a low ammonia storage level at the downstream part of the catalyst can reduce the undesired tailpipe ammonia slip. To achieve such an ammonia storage distribution control, a two-catalyst (in series) SCR system with NOx and NH3 sensors was devised. Grounded in a newly developed SCR control-oriented model, an adaptive (with respect to the SCR ammonia storage capacity) controller was designed to control the urea injection rate for achieving different ammonia storages in the two catalysts. Experimental data from a US06 test cycle conducted on a medium-duty Diesel engine system showed that, with the similar total engine-out NOx emissions and NH3 (AdBlue) consumptions, the proposed ASDC strategy simultaneously reduced the tailpipe NOx emissions by 57% and the ammonia slip by 74% in comparison to those from a conventional controller.

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