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CFD-Modeling of NOx Emissons: combustion of natural gas with highly preheated air in industrial scale furnace
2002 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This paper deals with CFD simulation of NOx formation when firing natural gas with HTAC(High Temperature Air Combustion) technology. Since 1987, the International Flame Research Foundation (IFRF) has been using the FLUENT CFD code for numerical simulations and developed user defined subroutines for combustion and NOx calculations. In 1997 the IFRF carried out industrial scale experiments measuring NOx emission for different burner inputs. The aim of this work is to make numerical simulations regarding NOx emission dependence of inlet NOx content, temperature and oxygen content and compare the results with the measurements. A secondary aim is to compare the NOx model developed by IFRF with the standard FLUENT NOx model. The main characteristics of HTAC like uniform temperature and low emissions of NO and CO are well captured. The in-flame predictions show overall good agreement with the measurements but the models have difficulties in predicting entrainment, chemistry and temperature in the fuel jet region. However, these problems have been seen to have only minor influence on the NOx predictions. The NOx emission predictions are also in good agreement with the measurements but some measurements are believed to be carried out under unknown furnace conditions. The IFRF NOx model predicts higher NOx formation than the FLUENT model at lower temperatures and oxygen contents. However, the IFRF NOx model´s behavior is uncertain because of imperfections in the predicted oxygen distribution.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Combustion, CFD, NOx-modeling
Keyword [sv]
URN: urn:nbn:se:ltu:diva-58679ISRN: LTU-EX--02/111--SELocal ID: f3f9a98e-b7d1-42de-a5c3-87e036bac304OAI: diva2:1032067
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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