scholarly journals An overview of the production and use of ammonia in NSR+SCR coupled system for NOx reduction from lean exhaust gas

2012 ◽  
Vol 197 (1) ◽  
pp. 144-154 ◽  
Author(s):  
Fabien Can ◽  
Xavier Courtois ◽  
Sébastien Royer ◽  
Gilbert Blanchard ◽  
Séverine Rousseau ◽  
...  
Keyword(s):  
Nox Reduction ◽  
Coupled System ◽  
Exhaust Gas ◽  
Lean Exhaust

Chapter 11. Combined LNT–SCR Catalysts for NOx Reduction from Lean Exhaust Gas

2018 ◽  
pp. 321-352
Author(s):  
Chuncheng Liu ◽  
Luca Lietti ◽  
Lidia Castoldi ◽  
Roberto Matarrese ◽  
Pio Forzatti
Keyword(s):  
Nox Reduction ◽  
Exhaust Gas ◽  
Scr Catalysts ◽  
Lean Exhaust

The removal of NOx from a lean exhaust gas using storage and reduction on H3PW12O40·6H2O

2002 ◽  
Vol 73 (3-4) ◽  
pp. 297-305 ◽  
Author(s):  
K. Vaezzadeh ◽  
C. Petit ◽  
V. Pitchon
Keyword(s):  
Exhaust Gas ◽  
Lean Exhaust

Effect of Volatiles on Soot Based Deposit Layers

2013 ◽  
Author(s):  
Ashwin Salvi ◽  
John Hoard ◽  
Mitchell Bieniek ◽  
Mehdi Abarham ◽  
Dan Styles ◽  
...  
Keyword(s):  
Heat Exchangers ◽  
Nox Reduction ◽  
Infrared Camera ◽  
Optical Microscope ◽  
Exhaust Gas ◽  
Thermogravimetric Analyzer ◽  
Gas Recirculation ◽  
Thermo Physical Properties ◽  
Deposit Layer

The implementation of exhaust gas recirculation (EGR) coolers has recently been a widespread methodology for engine in-cylinder NOX reduction. A common problem with the use of EGR coolers is the tendency for a deposit, or fouling layer to form through thermophoresis. These deposit layers consist of soot and volatiles and reduce the effectiveness of heat exchangers at decreasing exhaust gas outlet temperatures, subsequently increasing engine out NOX emission. This paper presents results from a novel visualization rig that allows for the development of a deposit layer while providing optical and infrared access. A 24-hour, 379 micron thick deposit layer was developed and characterized with an optical microscope, an infrared camera, and a thermogravimetric analyzer. The in-situ thermal conductivity of the deposit layer was calculated to be 0.047 W/mK. Volatiles from the layer were then evaporated off and the layer reanalyzed. Results suggest that volatile bake-out can significantly alter the thermo-physical properties of the deposit layer and hypotheses are presented as to how.

Metal layered zeolite catalysts for NOx abatement in lean exhaust gas conditions

1997 ◽  
Vol 60 (2) ◽  
pp. 297-302 ◽  
Author(s):  
H. Räisänen ◽  
R. L. Keiski ◽  
M. Härkönen ◽  
T. Maunula ◽  
P. Niemistö
Keyword(s):  
Zeolite Catalysts ◽  
Exhaust Gas ◽  
Nox Abatement ◽  
Lean Exhaust

scholarly journals A Study on the Predictive Maintenance Algorithms Considering Load Characteristics of PMSMs to Drive EGR Blowers for Smart Ships

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5744
Author(s):  
Sung-An Kim
Keyword(s):  
Electric Motor ◽  
Nox Reduction ◽  
Operation Time ◽  
Remaining Useful Life ◽  
Predictive Maintenance ◽  
Exhaust Gas ◽  
Electrical Failure ◽  
Information And Communication ◽  
Load Characteristics ◽  
Drive Systems

Exhaust gas recirculation (EGR) is a NOx reduction technology that can meet stringent environmental regulatory requirements. EGR blower systems must be used to increase the exhaust gas pressure at a lower rate than the scavenging air pressure. Electric motor drive systems are essential to rotate the EGR blowers. For the effective management of the EGR blower systems in smart ships, there is a growing need for predictive maintenance technology fused with information and communication technology (ICT). Since an electric motor accounts for about 80% of electric loads driven by the EGR, it is essential to apply the predictive maintenance technology of the electric motor to maximize the reliability and operation time of the EGR blower system. Therefore, this paper presents the predictive maintenance algorithm to prevent the stator winding turn faults, which is the most significant cause of the electrical failure of the electric motors. The proposed algorithm predicts the remaining useful life (RUL) by obtaining the winding temperature value by considering the load characteristics of the electric motor. The validity of the proposed algorithm is verified through the simulation results of an EGR blower system model and the experimental results derived from using a test rig.

NOx Emissions Modeling and Uncertainty From Exhaust-Gas-Diluted Flames

2015 ◽  
Vol 138 (5) ◽  
Author(s):  
Antonio C. A. Lipardi ◽  
Jeffrey M. Bergthorson ◽  
Gilles Bourque
Keyword(s):  
Nox Reduction ◽  
Flame Temperature ◽  
No Production ◽  
Exhaust Gas ◽  
Oxides Of Nitrogen ◽  
Nox Formation ◽  
Kinetic And Thermodynamic Parameters ◽  
Emissions Modeling ◽  
Combustion Processes ◽  
Gas Recirculation

Oxides of nitrogen (NOx) are pollutants emitted by combustion processes during power generation and transportation that are subject to increasingly stringent regulations due to their impact on human health and the environment. One NOx reduction technology being investigated for gas-turbine engines is exhaust-gas recirculation (EGR), either through external exhaust-gas recycling or staged combustion. In this study, the effects of different percentages of EGR on NOx production will be investigated for methane–air and propane–air flames at a selected adiabatic flame temperature of 1800 K. The variability and uncertainty of the results obtained by the gri-mech 3.0 (GRI), San-Diego 2005 (SD), and the CSE thermochemical mechanisms are assessed. It was found that key parameters associated with postflame NO emissions can vary up to 192% for peak CH values, 35% for thermal NO production rate, and 81% for flame speed, depending on the mechanism used for the simulation. A linear uncertainty analysis, including both kinetic and thermodynamic parameters, demonstrates that simulated postflame nitric oxide levels have uncertainties on the order of ±50–60%. The high variability of model predictions, and their relatively high associated uncertainties, motivates future experiments of NOx formation in exhaust-gas-diluted flames under engine-relevant conditions to improve and validate combustion and NOx design tools.

Exhaust Gas Recirculation Performance in Dry Low Emissions Combustors

2011 ◽  
Author(s):  
A. M. Elkady ◽  
A. R. Brand ◽  
C. L. Vandervort ◽  
A. T. Evulet
Keyword(s):  
Gas Turbine ◽  
Co2 Capture ◽  
Carbon Capture ◽  
Power Plants ◽  
Nox Reduction ◽  
Co2 Concentration ◽  
Exhaust Gas Recirculation ◽  
Exhaust Gas ◽  
Low Oxygen ◽  
Gas Recirculation

In a carbon constrained world there is a need for capturing and sequestering CO2. Post-combustion carbon capture via Exhaust Gas Recirculation (EGR) is considered a feasible means of reducing emission of CO2 from power plants. Exhaust Gas Recirculation is an enabling technology for increasing the CO2 concentration within the gas turbine cycle and allow the decrease of the size of the separation plant, which in turn will enable a significant reduction in CO2 capture cost. This paper describes the experimental work performed to better understand the risks of utilizing EGR in combustors employing dry low emissions (DLE) technologies. A rig was built for exploring the capability of premixers to operate in low O2 environment, and a series of experiments in a visually accessible test rig was performed at representative aeroderivative gas turbine pressures and temperatures. Experimental results include the effect of applying EGR on operability, efficiency and emissions performance under conditions of up to 40% EGR. Findings confirm the viability of EGR for enhanced CO2 capture; In addition, we confirm benefits of NOx reduction while complying with CO emissions in DLE combustors under low oxygen content oxidizer.

NOx abatement in lean exhaust gas conditions over metal substrated zeolite catalysts

1996 ◽  
Vol 27 (1-2) ◽  
pp. 85-90 ◽  
Author(s):  
R.L. Keiski ◽  
H. Räisänen ◽  
M. Härkönen ◽  
T. Maunula ◽  
P. Niemistö
Keyword(s):  
Zeolite Catalysts ◽  
Exhaust Gas ◽  
Nox Abatement ◽  
Lean Exhaust

Application of an Experimental EGR System to a Medium Speed EMD Marine Engine

2009 ◽  
Author(s):  
John Hedrick ◽  
Steven G. Fritz ◽  
Ted Stewart
Keyword(s):  
Nox Reduction ◽  
Injection Timing ◽  
Exhaust Gas ◽  
Marine Engine ◽  
Air Temperatures ◽  
Medium Speed ◽  
Particulate Matter Emissions ◽  
Baseline Test ◽  
Exhaust Energy ◽  
Gas Recirculation

This paper focuses on quantifying emission reductions associated with various on-engine technologies applied to Electro-Motive Diesel two-cycle diesel engines, which are very popular in marine and locomotive applications in North America. This paper investigates the benefits of using exhaust gas recirculation (EGR), separate circuit aftercooler, and retarded injection timing on a EMD 12-645E7 marine engine. The EGR system alone provided up to a 32.9% reduction in brake specific Nitrogen Oxides (NOx) emissions while demonstrating less than one percent increase in cycle brake specific fuel consumption (BSFC). The brake specific particulate matter emissions increased somewhat, but at a modest rate based on the amount of NOx emission reduction. When the enhanced aftercooler system was combined with the addition of EGR, there was a 31.9% reduction in NOx and essentially no change to the BSFC when compared to the baseline test. The minimum manifold air temperature (MAT) was limited due to the size of the standard EMD aftercooler heat exchanger that is fitted on the engine. No efforts to modify the turbocharger to improve the turbo match to take advantage of the lower manifold air temperatures and the corresponding lower exhaust energy. Once 4° static injection timing retard was introduced, along with the EGR and the minimum MAT, a maximum NOx reduction of 49% was realized with only a 1.1% increase over the baseline BSFC.

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