This paper reports part of the results of the campaigns performed on a low NO(x) burner, firing natural gas in oxy-fuel conditions. The results of combustion tests on burning natural gas with different flue gas recycle rates are presented, with a particular emphasis on NO(x) production that might affect retrofitting of oxy-fuel technology in conventional boilers. The process and flame characterisation performed on natural gas provides a valuable set of experimental data for the technological development of oxy-combustion burner technology with recycled flue gas, especially in retrofitting scenarios. The data can be used to develop a better understanding of the chemical and physical phenomena involved in oxy-fuel combustion and can provide modellers with a valuable hint for the development of specific sub-models for oxy-combustion simulation. Since is seems technologically unfeasible to reduce down to zero the presence of nitrogen in recycled flue gases, due to air in-leakages, the presence of relatively small amounts of nitrogen in crucial location in the burner provides a thermal NO(x) source, depending on local levels of temperature and oxygen concentration. (C) 2010 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
Retrofitting oxy-fuel technology in a semi-industrial plant: Flame characteristics and NO(x) production from a low NO(x) burner fed with natural gas
TOGNOTTI, LEONARDO;
2011-01-01
Abstract
This paper reports part of the results of the campaigns performed on a low NO(x) burner, firing natural gas in oxy-fuel conditions. The results of combustion tests on burning natural gas with different flue gas recycle rates are presented, with a particular emphasis on NO(x) production that might affect retrofitting of oxy-fuel technology in conventional boilers. The process and flame characterisation performed on natural gas provides a valuable set of experimental data for the technological development of oxy-combustion burner technology with recycled flue gas, especially in retrofitting scenarios. The data can be used to develop a better understanding of the chemical and physical phenomena involved in oxy-fuel combustion and can provide modellers with a valuable hint for the development of specific sub-models for oxy-combustion simulation. Since is seems technologically unfeasible to reduce down to zero the presence of nitrogen in recycled flue gases, due to air in-leakages, the presence of relatively small amounts of nitrogen in crucial location in the burner provides a thermal NO(x) source, depending on local levels of temperature and oxygen concentration. (C) 2010 The Combustion Institute. Published by Elsevier Inc. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
