A simplified approach for predicting NO formation in MILD combustion of CH4–H2 mixtures

2011 ◽  
Vol 33 (2) ◽  
pp. 3343-3350 ◽  
Author(s):  
A. Parente ◽  
C. Galletti ◽  
L. Tognotti
Keyword(s):  
Simplified Approach ◽  
No Formation ◽  
Mild Combustion

Effects of hydrogen addition on structure and NO formation of highly CO-Rich syngas counterflow nonpremixed flames under MILD combustion regime

2021 ◽  
Vol 46 (17) ◽  
pp. 10518-10534
Author(s):  
Namsu Kim ◽  
Yongmo Kim ◽  
Mohammad Nazri Mohd Jaafar ◽  
Muhammad Roslan Rahim ◽  
Mazlan Said
Keyword(s):  
Combustion Regime ◽  
Nonpremixed Flames ◽  
Hydrogen Addition ◽  
No Formation ◽  
Mild Combustion

Mechanisms of NO formation in MILD combustion of CH 4 /H 2 fuel blends

2014 ◽  
Vol 39 (33) ◽  
pp. 19187-19203 ◽  
Author(s):  
P. Li ◽  
F. Wang ◽  
J. Mi ◽  
B.B. Dally ◽  
Z. Mei ◽  
...  
Keyword(s):  
Fuel Blends ◽  
No Formation ◽  
Mild Combustion

Numerical and experimental studies of the NO formation in laminar coflow diffusion flames on their transition to MILD combustion regime

2013 ◽  
Vol 160 (8) ◽  
pp. 1364-1372 ◽  
Author(s):  
A.V. Sepman ◽  
S.E. Abtahizadeh ◽  
A.V. Mokhov ◽  
J.A. van Oijen ◽  
H.B. Levinsky ◽  
...  
Keyword(s):  
Diffusion Flames ◽  
Experimental Studies ◽  
Combustion Regime ◽  
No Formation ◽  
Mild Combustion

scholarly journals Reduced NO formation models for CFD simulations of MILD combustion

2015 ◽  
Vol 40 (14) ◽  
pp. 4884-4897 ◽  
Author(s):  
Chiara Galletti ◽  
Marco Ferrarotti ◽  
Alessandro Parente ◽  
Leonardo Tognotti
Keyword(s):  
Cfd Simulations ◽  
No Formation ◽  
Mild Combustion

Numerical and Experimental Studies of NO Formation Mechanisms under Methane Moderate or Intense Low-Oxygen Dilution (MILD) Combustion without Heated Air

2015 ◽  
Vol 29 (3) ◽  
pp. 1987-1996 ◽  
Author(s):  
Shiying Cao ◽  
Chun Zou ◽  
Qingsong Han ◽  
Yang Liu ◽  
Di Wu ◽  
...  
Keyword(s):  
Experimental Studies ◽  
Formation Mechanisms ◽  
Low Oxygen ◽  
No Formation ◽  
Mild Combustion ◽  
Heated Air

Numerical study of characteristics on NO formation in methane MILD combustion with simultaneously hot and diluted oxidant and fuel (HDO/HDF)

Energy ◽  
2016 ◽  
Vol 112 ◽  
pp. 1024-1035 ◽  
Author(s):  
Yizhuo He ◽  
Chun Zou ◽  
Yu Song ◽  
Yang Liu ◽  
Chuguang Zheng
Keyword(s):  
Numerical Study ◽  
No Formation ◽  
Mild Combustion

WET BURNING – THE MODERN TREND IN ENVIRONMENTAL BENIGN FUEL COMBUSTION AND IN SOLUTION TO THE PROBLEM OF SUSTAINABLE DEVELOPMENT OF THE POWER GENERATION

2018 ◽  
pp. 96-117 ◽  
Author(s):  
B. S. Soroka
Keyword(s):  
Numerical Simulation ◽  
Nitrogen Oxides ◽  
Chemical Kinetics ◽  
Fuel Combustion ◽  
Transport Processes ◽  
Cfd Modeling ◽  
Furnace Chamber ◽  
Modern Trend ◽  
Atmospheric Air ◽  
No Formation

The article considers the role and place of water and water vapor in combustion processes with the purpose of reduction the effluents of nitrogen oxides and carbon oxide. We have carried out the complex of theoretical and computational researches on reduction of harmful nitrogen and carbon oxides by gas fuel combustion in dependence on humidity of atmospheric air by two approaches: CFD modeling with attraction of DRM 19 chemical kinetics mechanism of combustion for 19 components along with Bowman’s mechanism used as “postprocessor” to determine the [NO] concentration; different thermodynamic models of predicting the nitrogen oxides NO formation. The numerical simulation of the transport processes for momentum, mass and heat being solved simultaneously in the united equations’ system with the chemical kinetics equations in frame of GRI methane combustion mechanism and NO formation calculated afterwards as “postprocessor” allow calculating the absolute actual [CO] and [NO] concentrations in dependence on combustion operative conditions and on design of furnace facilities. Prediction in frame of thermodynamic equilibrium state for combustion products ensures only evaluation of the relative value of [NO] concentration by wet combustion the gas with humid air regarding that in case of dry air – oxidant. We have developed the methodology and have revealed the results of numerical simulation of impact of the relative humidity of atmospheric air on harmful gases formation. Range of relative air humidity under calculations of atmospheric air under impact on [NO] and [CO] concentrations at the furnace chamber exit makes φ = 0 – 100%. The results of CFD modeling have been verified both by author’s experimental data and due comparing with the trends stated in world literature. We have carried out the complex of the experimental investigations regarding atmospheric air humidification impact on flame structure and environmental characteristics at natural gas combustion with premixed flame formation in open air. The article also proposes the methodology for evaluation of the nitrogen oxides formation in dependence on moisture content of burning mixture. The results of measurements have been used for verification the calculation data. Coincidence of relative change the NO (NOx) yield due humidification the combustion air revealed by means of CFD prediction has confirmed the qualitative and the quantitative correspondence of physical and chemical kinetics mechanisms and the CFD modeling procedures with the processes to be studied. A sharp, more than an order of reduction in NO emissions and simultaneously approximately a two-fold decrease in the CO concentration during combustion of the methane-air mixture under conditions of humidification of the combustion air to a saturation state at a temperature of 325 K.

Simplified Approach to Calculating Geometric Stiffness Properties of Tread Pattern Elements

2003 ◽  
Vol 31 (3) ◽  
pp. 132-158 ◽  
Author(s):  
R. E. Okonieski ◽  
D. J. Moseley ◽  
K. Y. Cai
Keyword(s):  
Development Process ◽  
Functional Design ◽  
Simplified Approach ◽  
Tire Industry ◽  
Geometric Stiffness ◽  
Stiffness Properties ◽  
Engineering Parameters ◽  
Net To Gross ◽  
Significant Effort

Abstract The influence of tread designs on tire performance is well known. The tire industry spends significant effort in the development process to create and refine tread patterns. Creating an aesthetic yet functional design requires characterization of the tread design using many engineering parameters such as stiffness, moments of inertia, principal angles, etc. The tread element stiffness is of particular interest because of its use to objectively determine differences between tread patterns as the designer refines the design to provide optimum levels of performance. The tread designer monitors the change in stiffness as the design evolves. Changes to the geometry involve many attributes including the number of sipes, sipe depth, sipe location, block element edge taper, nonskid depth, area net-to-gross, and so forth. In this paper, two different formulations for calculating tread element or block stiffness are reviewed and are compared to finite element results in a few cases. A few simple examples are shown demonstrating the basic functionality that is possible with a numerical method.

A Simplified Protocol for the ortho-Deuteration of Acidic Aromatic Compounds in D2O

2019 ◽  
Author(s):  
Alyssa Garreau ◽  
Hanyang Zhou ◽  
Michael Young
Keyword(s):  
Carboxylic Acid ◽  
Aromatic Compounds ◽  
Large Scale ◽  
Simplified Approach ◽  
Directing Group ◽  
Large Scale Synthesis

<div>Methods to catalytically introduce deuterium in synthetically useful yields ortho to a carboxylic acid directing group on arenes typically requires D2 or CD3CO2D, which makes using these approaches cost prohibitive for large scale synthesis (equipment and reagent costs respectively). Herein we present a simplified approach using catalytic RhIII and D2O as deuterium source, and show its application to H/D exchange on various acidic substrates.</div>

Sign in / Sign up

Export Citation Format

Share Document