Research on the secondary air position for the one-dimensional model of low NOx combustion

Author

Xiang Gou ; Jinxiang Wu ; Liansheng Liu ; Enyu Wang ; Junhu Zhou ; Jianzhong Liu ; Kefa Cen

Author_Institution

Sch. of Energy & Environ. Eng., Hebei Univ. of Technol., Tianjin, China

fYear

2012

fDate

27-29 Sept. 2012

Firstpage

296

Lastpage

301

Abstract

This study developed a new model of low NOx combustion for the direct flow of pulverized coal, which enabled the relationships among gas temperature, oxygen concentration, time consumption, and distance to be investigated. A model of the ignition and combustion zone was discussed in detail. It was shown that the gas temperature and the oxygen concentration change with the distance. The proper position of the secondary air injection can be obtained according to the gas temperature and the oxygen concentration which significantly affect NOx formation. The model can be used to determine the injection position of the secondary air for the design or modification of boilers for low NOx coal combustion. Application of the model to a power plant boiler together with pre-ignition model and reburning technology enabled an overall 48% reduction of NOx to be obtained.

Keywords

air pollution; boilers; coal; combustion; ignition; pulverised fuels; thermal power stations; boiler design; boiler modification; combustion zone model; direct pulverized coal flow; gas temperature; ignition zone model; low nitrogen combustion; one-dimensional model; oxygen concentration; oxygen concentration change; pre-ignition model; reburning technology; secondary air injection; secondary air position; time consumption; Atmospheric modeling; Boilers; Coal; Combustion; Ignition; Mathematical model; Water heating; NOx; coal combustion; model; secondary air;

fLanguage

English

Publisher

ieee

Conference_Titel

Information and Automation for Sustainability (ICIAfS), 2012 IEEE 6th International Conference on

Conference_Location

Beijing

Print_ISBN

978-1-4673-1976-8

Type

conf

DOI

10.1109/ICIAFS.2012.6419920

Filename

6419920