Homogeneous Oxidation of Volatile Nitrogen (NH3, HCN) to Nitrogen Oxides: A Modeling Study of the Effect of Alkali Vapors

José Rafael HERNÁNDEZ CARUCCI

Article Details

Homogeneous Oxidation of Volatile Nitrogen (NH3, HCN) to Nitrogen Oxides: A Modeling Study of the Effect of Alkali Vapors

Authors:

José Rafael HERNÁNDEZ CARUCCI

Publisher:

TUBITAK

Journal:

Turkish Journal of Engineering and Environmental Sciences 2006 Vol.30 Issue 3, pp.163-174

Document Type:

Article

Publication Date:

2/2006

Document Language:

Turkish

Document ID (Org No.):

2000745011

Frequency:

Tri-annual

eISSN:

1303-6157

pISSN:

1300-0160

Abstract:

 

The effect of alkali vapors in the combustion of different  types of Scandinavian fuels, i.e. Finnish black liquor, Swedish wood  and Danish straw, was studied based on detailed chemical kinetic  modeling.  Two H/C/O/N/Na/K mechanisms consisting of about 350  reactions between 60 chemical species were utilized and validated with  available experimental data from the literature.  The agreement with  the experimental results was satisfactory.  The results demonstrated  that the alkali species studied, i.e. Na and K, promote the NOx  reduction in the air staged or non-staged combustion systems.  The  presence of alkali metals increased the optimum temperature from ca.   1073-1173 K (no alkali cases) to ca.  1273-1373 K (alkali cases) due  to the removal of the radicals via the following sequence:      	NaOH + H \to Na + H2 O 	{R254} (1)    	Na + O2 + M \to NaO2 + M	 {R242} (2)    	NaO2 + OH \to NaOH + O2 	 {R260} (3)    	-------------------------------------    	H + OH \to H2 O  	 (4)      which leads to a net formation of water (H2O) from H and OH. The same  trend was observed for K chemistry.  Sensitivity and reaction path  analysis was applied to investigate the most crucial reactions on the  predictions.

 

The effect of alkali vapors in the combustion of different  types of Scandinavian fuels, i.e. Finnish black liquor, Swedish wood  and Danish straw, was studied based on detailed chemical kinetic  modeling.  Two H/C/O/N/Na/K mechanisms consisting of about 350  reactions between 60 chemical species were utilized and validated with  available experimental data from the literature.  The agreement with  the experimental results was satisfactory.  The results demonstrated  that the alkali species studied, i.e. Na and K, promote the NOx  reduction in the air staged or non-staged combustion systems.  The  presence of alkali metals increased the optimum temperature from ca.   1073-1173 K (no alkali cases) to ca.  1273-1373 K (alkali cases) due  to the removal of the radicals via the following sequence:      	NaOH + H \to Na + H2 O 	{R254} (1)    	Na + O2 + M \to NaO2 + M	 {R242} (2)    	NaO2 + OH \to NaOH + O2 	 {R260} (3)    	-------------------------------------    	H + OH \to H2 O  	 (4)      which leads to a net formation of water (H2O) from H and OH. The same  trend was observed for K chemistry.  Sensitivity and reaction path  analysis was applied to investigate the most crucial reactions on the  predictions.

Article Details

Homogeneous Oxidation of Volatile Nitrogen (NH3, HCN) to Nitrogen Oxides: A Modeling Study of the Effect of Alkali Vapors

Authors: José Rafael HERNÁNDEZ CARUCCI

Publisher: TUBITAK

Journal: Turkish Journal of Engineering and Environmental Sciences 2006 Vol.30 Issue 3, pp.163-174

Document Type: Article

Publication Date: 2/2006

Document Language: Turkish

Document ID (Org No.): 2000745011

Frequency: Tri-annual

eISSN: 1303-6157

pISSN: 1300-0160

Issues

Authors:

José Rafael HERNÁNDEZ CARUCCI

Publisher:

TUBITAK

Journal:

Turkish Journal of Engineering and Environmental Sciences 2006 Vol.30 Issue 3, pp.163-174

Document Type:

Article

Publication Date:

2/2006

Document Language:

Turkish

Document ID (Org No.):

2000745011

Frequency:

Tri-annual

eISSN:

1303-6157

pISSN:

1300-0160