Mathematical Modeling of Swirling Flames of Pulverized Coal: What Can Combustion Engineers Expect From Modeling?

1995 ◽  
Vol 117 (2) ◽  
pp. 289-297 ◽  
Author(s):  
R. Weber ◽  
A. A. F. Peters ◽  
P. P. Breithaupt ◽  
B. M. Visser
Keyword(s):  
Mathematical Modeling ◽  
Combustion Products ◽  
Pulverized Coal ◽  
Model Parameters ◽  
Lagrangian Particle ◽  
Mass Fractions ◽  
Engineering Information ◽  
Nitric Oxide Emissions ◽  
Swirling Flames ◽  
No Emissions

The present study is concerned with mathematical modeling of swirling pulverized coal flames. The attention is focused on the near burner zone properties of high-and low-NOx flames issued from an Aerodynamically Air Staged Burner of 3.4 MW thermal input. The swirling combusting flows are calculated using the k–ε model and second-order models of turbulence. The Eulerian balance equations for enthalpy and mass fractions of oxygen, volatiles, carbon monoxide and final combustion products (CO2 + H2O) are solved. The Lagrangian particle tracking is accompanied by appropriate models of coal devolatilization and char combustion. Nitric oxide emissions are calculated using a NOx post-processor for thermal-, prompt- and fuel-NO. The objective of this paper is to examine whether the engineering information required for designing industrial burners is obtainable through the mathematical modeling. To this end, the flame computations, including NO emissions, are compared with the measured in-flame data. The guidelines as to the combination of physical submodels and model parameters needed for quality predictions of different flame types are given. The paper is a shorter version of our recent ASME publication (Weber et al., 1993).

Prediction of CO and NOx Pollutants in a Stratified Bluff Body Burner

2017 ◽  
Author(s):  
Pascal Gruhlke ◽  
Fabian Proch ◽  
Andreas M. Kempf ◽  
Enric Illana Mahiques ◽  
Stefan Dederichs ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Carbon Monoxide ◽  
Bluff Body ◽  
Combustion Products ◽  
Combustion Model ◽  
Wide Range ◽  
Flame Region ◽  
Numerical Grid ◽  
Nitric Oxide Emissions ◽  
Heavy Duty Gas Turbine

The major exhaust gas pollutants from heavy duty gas turbine engines are CO and NOx. The difficulty of predicting the concentration of these combustion products originates from their wide range of chemical time scales. In this paper, a combustion model that includes the prediction of the carbon monoxide and nitric oxide emissions is tested. Large eddy simulations (LES) are performed using a compressible code (OpenFOAM). A modified flamelet generated manifolds (FGM) approach is applied with a thickened flame approach (ATF) to resolve the flame on the numerical grid, with a flame sensor to ensure that the flame is only thickened in the flame region. For the prediction of the CO and NOx emissions, pollutant species transport equations and a second, CO based, progress variable are introduced for the flame burnout zone to account for slow chemistry effects. For the validation of the models, the Cambridge burner of Sweeney and Hochgreb [1, 2] is employed, as both carbon monoxide and nitric oxide [3] data is available.

Mathematical Modeling of a 2.4 MW Swirling Pulverized Coal Flame

1997 ◽  
Vol 122 (1-6) ◽  
pp. 131-182 ◽  
Author(s):  
André A. F. Peters ◽  
Roman Weber
Keyword(s):  
Mathematical Modeling ◽  
Pulverized Coal

scholarly journals Comparison of Three Measures to Promote National Fitness in China by Mathematical Modeling

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Pan Tang ◽  
Daqing Xu ◽  
Qing Dai ◽  
Tingting Huang
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
Physical Exercise ◽  
Three Dimensional ◽  
Chinese Government ◽  
Model Parameters ◽  
National Bureau ◽  
Short Period ◽  
Key Parameter

In this paper we established a mathematical model for national fitness in China. Based on a questionnaire and data of the General Administration of Sport of China and the National Bureau of Statistics of China, the dynamics for three classes of people are expressed by a system of three-dimensional ordinary equations. Model parameters are estimated from the data. This study indicated that national fitness put out by the Chinese government is reasonable. By finding the key parameter, the best measure to promote national fitness is put forward. In order to increase the number of people who frequently participate in sport exercise in a short period of time, if only one measure can be chosen, guiding people who never take part in physical exercise will be the best measure.

Optical non-intrusive measurements of internal recirculation zone of pulverized coal swirling flames with secondary swirl intensity

Energy ◽  
2016 ◽  
Vol 103 ◽  
pp. 61-74 ◽  
Author(s):  
Yonmo Sung ◽  
Sangmin Lee ◽  
Seongyong Eom ◽  
Cheoreon Moon ◽  
Seongyool Ahn ◽  
...  
Keyword(s):  
Recirculation Zone ◽  
Pulverized Coal ◽  
Swirl Intensity ◽  
Swirling Flames

scholarly journals Preface

2021 ◽  
Vol 2131 (1) ◽  
pp. 011001
Keyword(s):  
Mathematical Modeling ◽  
Artificial Intelligence ◽  
Information Technologies ◽  
Materials Science ◽  
Technical Equipment ◽  
Energy Materials ◽  
Travel Restrictions ◽  
Engineering Information ◽  
Recognition Theory ◽  
Intelligent Information

Abstract “Intelligent Information Technologies and Mathematical Modeling” is an international scientific and practical conference, the second in a series of annual conferences dedicated to the analysis of modern problems and achievements in the field of mathematical modeling and intelligent information technologies, including artificial intelligence, software engineering, information systems security and their application in various fields of science, technology and education. The main goal of the conference is to provide an opportunity to discuss modern achievements and prospects for the development of mathematical modeling, computational methods, intelligent information and software technologies that are essential for fundamental science and applied research in the field of: continuum mechanics, hydroaerodynamics, earth sciences, chemistry, biology, social and economic sciences, mechanical engineering and energy, materials science, nanotechnology, image processing and pattern recognition, theory of parallel computing and its applications, cybersecurity, large database technologies and artificial intelligence. The conference was held in Divnomorskoe, Krasnodar Territory, Russia on 30 May - 6 June, 2021. For foreign participants who couldn’t attend the conference due to the travel restrictions caused by the spread of the coronavirus infection, a teleconference was organized in one day of the conference week. Each participant had 10-15 minutes to present his research. After that, 5-7 minutes were allotted for questions and discussion. More than 1500 participants took part in the conference. During the conference, the technical equipment of the venue worked perfectly, no problems arose. Both the participants and the organizers of the conference were satisfied with the event. Presentation of information by the participants virtually did not cause any difficulties. In general, the experience of holding the conference partially in a virtual format was considered positive. List of Organizing Committee Chair and Co-Chairs, Scientific Committee Members are available in this pdf.

scholarly journals Calculation of Toxic Substance Burning with Formation of Combustion Products’ Vertical Supersonic Stream

2016 ◽  
Vol 5 (6) ◽  
pp. 30-37
Author(s):  
Дорофеев ◽  
A. Dorofeev ◽  
Бурцев ◽  
I. Burtsev
Keyword(s):  
Mathematical Modeling ◽  
Supersonic Flow ◽  
Rocket Engine ◽  
Toxic Substance ◽  
Combustion Products ◽  
Liquid Rocket Engine ◽  
Supersonic Stream ◽  
Gas Dynamic ◽  
Liquid Rocket ◽  
The One

A system for burning of a destroyed highly toxic substance with formation of a vertical supersonic stream of combustion products moved away to the atmosphere on considerable heights has been considered. A technique and an algorithm for conjugated gas-dynamic and thermodynamic calculation of working processes in two-zonal unit with primary burning using air in a camera similar to the one of a liquid rocket engine, and after-burning in a supersonic flow have been proposed. The technique has been approved on the examples of after-burning mathematical modeling and a parametrical research on combustion completeness influence on composition and properties of products resulting from heptyl combustion in air with after-burning in case of methane supply in the second zone.

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