Vibrational CARS thermometry and one-dimensional simulations in laminar H 2 /air counter-flow diffusion flames

The reduction of nitrogen oxides in the high temperature flame is the key factor affecting the oxygen-enriched combustion performance. A numerical study using an OPPDIF code with detailed chemistry mechanism GRI 3.0 was carried out to focus on the effect of strain rate (25-130 s?1) and CO2 addition (0-0.59) on the oxidizer side on NO emission in CH4 / N2 / O2 counter-flow diffusion flame. The mole fraction profiles of flame structures, NO, NO2 and some selected radicals (H, O, OH) and the sensitivity of the dominant reactions contributing to NO formation in the counter-flow diffusion flames of CH4\/ N2 /O2 and CH4 / N2 / O2 / CO2 were obtained. The results indicated that the flame temperature and the amount of NO were reduced while the sensitivity of reactions to the prompt NO formation was gradually increased with the increasing strain rate. Furthermore, it is shown that with the increasing CO2 concentration in oxidizer, CO2 was directly involved in the reaction of NO consumption. The flame temperature and NO production were decreased dramatically and the mechanism of NO production was transformed from the thermal to prompt route.

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Transient analysis of the nonmonotonic response of counterflow laminar diffusion flames in alternating current and step electric fields using a one-dimensional ionic transport model

Physical Review E ◽

10.1103/physreve.102.033209 ◽

2020 ◽

Vol 102 (3) ◽

Author(s):

Byung Chul Choi ◽

Pyeong Jun Park

Keyword(s):

Electric Fields ◽

Transient Analysis ◽

Diffusion Flames ◽

Transport Model ◽

Ionic Transport ◽

Alternating Current ◽

One Dimensional ◽

Laminar Diffusion Flames ◽

Laminar Diffusion

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Study of Extinction Limits of Diluted Hydrogen-Air Counter-Flow Diffusion Flames with the Redim Method

Combustion Science and Technology ◽

10.1080/00102202.2014.935125 ◽

2014 ◽

Vol 186 (10-11) ◽

pp. 1502-1516 ◽

Cited By ~ 9

Author(s):

A. Neagos ◽

V. Bykov ◽

U. Maas

Keyword(s):

Diffusion Flames ◽

Counter Flow

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A Finite Volume SOFC Model for Coal-Based Integrated Gasification Fuel Cell System Analysis

ASME 2009 7th International Conference on Fuel Cell Science, Engineering and Technology ◽

10.1115/fuelcell2009-85247 ◽

2009 ◽

Cited By ~ 3

Author(s):

Mu Li ◽

Jacob Brouwer ◽

James D. Powers ◽

G. Scott Samuelsen

Keyword(s):

Fuel Cell ◽

Solid Oxide Fuel Cells ◽

Finite Volume ◽

Coal Gasification ◽

System Analysis ◽

Cell System ◽

Counter Flow ◽

One Dimensional ◽

Flow Configurations ◽

Integrated Gasification

Integrated gasification fuel cell (IGFC) systems combining coal gasification and solid oxide fuel cells (SOFC) are promising for highly efficient and environmentally friendly utilization of coal for energy production. Most IGFC system analyses performed to date have used non-dimensional thermodynamic SOFC models that do not resolve the intrinsic constraints of SOFC operation. In this work, a one-dimensional finite volume model for planar SOFC is developed and verified using literature data. Special attention is paid to making the model capable of supporting recent SOFC technology improvements, including the use of anode-supported configurations, metallic interconnects, and reduced polarization losses. Results are presented for SOFC operation on humidified hydrogen and methane-containing syngas, under co-flow and counter-flow configurations; detailed internal profiles of species mole fractions, temperature, current density and electrochemical performance are obtained. The effects of performance, fuel composition and flow configuration on SOFC performance and thermal profiles are evaluated, and the implications of these results for system design and analysis are discussed.

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