Chemical Kinetic Study of Nitrogen Oxides Formation Trends in Biodiesel Combustion

Jiang, Yang; Golovitchev, Valeri; Lurbe, Pau Redón; Sanchez, James

doi:10.1155/2012/898742

Cited by 18 publications

(5 citation statements)

References 39 publications

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“…The higher the accuracy of the solutions of the burning process equations, the higher the accuracy of obtaining data on NO x emissions. The influence of the residence time of the initial components on the mechanisms of formation of nitrogen oxides is taken into account through the variables of the convection process in the constitutive [5][6][7]. For the mechanism of formation of thermal and fast NO x , only one equation is needed:…”

Section: Methodsmentioning

confidence: 99%

Numerical simulation of nitrogen oxide formation in dust furnaces

et al. 2022

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Even though natural sources of air pollution account for over 50 % of sulphur compounds, 93 % of nitrogen oxide which are the most dangerous artificial anthropogenic sources of air pollution and primarily associated with the combustion of fossil fuel. Coal-fired thermal power plants and industrial fuel-burning plants that emit large quantities of nitrogen oxides (NО and NО2), solids (ash, dust, soot), as well as carbon oxides, aldehydes, organic acids into the atmosphere pollute the environment in majority. In the present work, a mathematical model and a scheme for calculating the formation of nitrogen oxide has been developed. Also, the dependence of the rate of release of fuel nitrogen from coal particles at the initial stage of gasification and content of volatiles has been obtained. The main regularities of the formation of NOx at the initial section of the flame in the ignition zone of the swirl burner flame during the combustion of Ekibastuz coal have been revealed. Modern environmental requirements for the modernization of existing and the creation of new heat and power facilities determine the exceptional relevance of the development of effective methods and constructions to reduce emissions of nitrogen oxides, sulfur oxides and ash to 200, 300, and 100 mg/nm3 at a=1.4. The dust consumption in all experiments was kept constant and amounted to 0.042 g/s, as well as with the results of calculating the thermal decomposition of the Ekibastuz coal dust, the recombination of atomic nitrogen into nitrogen molecules, and the kinetics of the formation of fuel nitric oxide. It was found that despite the presence of oxygen in Ekibastuz coal for gases Odaf=11.8 % in an inert atmosphere, nitrogen oxides are not formed

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Section: Methodsmentioning

confidence: 99%

Numerical simulation of nitrogen oxide formation in dust furnaces

et al. 2022

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“…The chemistry of the fuel is modeled using a primary reference fuel mechanism from Liu et al 35 . The Hiroyasu model 36 , coupled with the Nagle and Strickland-Constable model 37 is used to estimate the soot oxidation, while NO x predictions are carried out by means of a four-species, 13-reaction reduced mechanism 38 . The base mesh size in the domain is set to 1.4 mm, while adaptive mesh refinement based on velocity and temperature gradients is used to reach a minimum mesh size of 0.35 mm in those regions where the gradient-based refinement criteria are met.…”

Section: Methodsmentioning

confidence: 99%

End-to-end modeling of fuel injection via static coupling of internal flow and ensuing spray

2022

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Accurate knowledge of fuel spray behavior is of utmost importance for liquid-fuel-based combustion systems. Fuel properties, injector geometry, operating conditions, and thermal state of the combustion chamber determine the fuel’s ability to mix and burn efficiently. Three-dimensional computational-fluid-dynamics models can reveal the complex dynamics of the injector’s internal flow, as well as the spray breakup, evaporation, mixing, and combustion. However, time and length scales of in-nozzle flow and ensuing spray can differ by several orders of magnitude, limiting the feasibility of a simultaneous solution of the entire chain of physics. This work explores an end-to-end approach to decouple the problem at the injector outlet via a static-coupling framework. Flowfields are sampled at the injector exit, stored into spatiotemporally resolved maps, and used to initialize a Lagrangian spray whose properties reflect the flow’s instantaneous state as predicted by the in-nozzle flow simulations. Comparisons against typical rate-of-injection results and qualitative validation against optical spray data highlighted the ability of static coupling to unveil spray physics that would otherwise be missed.

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“…Both H 2 /O 2 and NOx mechanisms from GRI-Mech (Smith et al, 1999) 5. H 2 /O 2 mechanism of UCSD and NOx mechanism of Yang et al (2012) 6. A combination of the H 2 /O 2 mechanism from Konnov (2008) and the NOx mechanism from UCSD 7.…”

Section: Reaction Kinetics and Validationmentioning

confidence: 96%

Stretch and Curvature Effects on NO Emission of H₂/Air Diffusion Flames

Fernandez

Zhang

et al. 2015

Combustion Science and Technology

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Opposed jet H 2 diffusion flames are simulated with different H 2 /O 2 and NOx chemical kinetic mechanisms. The simulations with University of California, San Diego (UCSD) NOx and H 2 /O 2 mechanisms are identified to have the best agreement with the experimental data. With these mechanisms, the pressure effect on NO emission of the opposed jet flame is studied and it is shown that higher pressure enhances combustion increasing the flame temperature and NO emissions. The curved opposed tubular H 2 diffusion flames are simulated and compared with the opposed jet flames. It is shown that positive curvature enhances the preferential diffusion effect and increases flame temperature and NO emission; and vice versa for negative curvature. Flame curvature can change the NO emission as much as 5.4 times for the tested cases. A detailed flame structure comparison among curved flames and planar flames demonstrates that tubular flames are slightly narrower and their maximum stretch rates are slightly higher.

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Chemical Kinetic Study of Nitrogen Oxides Formation Trends in Biodiesel Combustion

Cited by 18 publications

References 39 publications

Numerical simulation of nitrogen oxide formation in dust furnaces

Numerical simulation of nitrogen oxide formation in dust furnaces

End-to-end modeling of fuel injection via static coupling of internal flow and ensuing spray

Stretch and Curvature Effects on NO Emission of H₂/Air Diffusion Flames

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Chemical Kinetic Study of Nitrogen Oxides Formation Trends in Biodiesel Combustion

Cited by 18 publications

References 39 publications

Numerical simulation of nitrogen oxide formation in dust furnaces

Numerical simulation of nitrogen oxide formation in dust furnaces

End-to-end modeling of fuel injection via static coupling of internal flow and ensuing spray

Stretch and Curvature Effects on NO Emission of H2/Air Diffusion Flames

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Product

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Stretch and Curvature Effects on NO Emission of H₂/Air Diffusion Flames