The Generation and Suppression of NOx and N2O Emissions in the Oxy-Fuel Combustion Process with Recycled CO2 (an Overview)

It is shown that combustion of solid fuels in an oxygen atmosphere with recycled flue gases is an efficient method for capture of CO 2 . The use of the circulating fluidized bed (CFB) technology in the oxy-fuel combustion process reduces the CO 2 capture costs and nitrogen oxide emissions compared w...

Full description

Saved in:

Bibliographic Details
Published in:	Thermal engineering Vol. 67; no. 1; pp. 1 - 9
Main Authors:	Khalid El Sheikh, Ryabov, G. A., Hamid, Mahar Diana, Bukharkina, T. V., Hussain, Mohmad Azlan
Format:	Journal Article
Language:	English
Published:	Moscow Pleiades Publishing 2020 Springer Nature B.V
Subjects:	Atmospheric models Basic oxides Biomass Biomass burning Boiler Auxiliary Equipment Burner Units Carbon dioxide Carbon sequestration Computer simulation Engineering Engineering Thermodynamics Flue gas Fluidized beds Fuel combustion Heat and Mass Transfer Mathematical analysis New technology Nitrogen Nitrogen oxides Nitrous oxide Oxy-fuel Pollutants Power-Plant Fuels Recycling Solid fuels Steam Boilers Volatile compounds mathematical simulation biomass circulating fluidized bed oxy-fuel combustion cofiring nitrogen oxides
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	It is shown that combustion of solid fuels in an oxygen atmosphere with recycled flue gases is an efficient method for capture of CO 2 . The use of the circulating fluidized bed (CFB) technology in the oxy-fuel combustion process reduces the CO 2 capture costs and nitrogen oxide emissions compared with flare combustion. The mechanisms of generation and suppression of nitrogen and nitrous oxides during CFB combustion of solid fuels are considered. The basic reactions that occur during the exit and burning of volatiles and combustion of char resulting in generation of NO, N 2 O, and N 2 are indicated. The effect of the secondary air delivery on nitrogen oxide emissions is studied. It is shown that the degree of converting fuel nitrogen into N 2 O is reduced when the degree of converting nitrogen into NO x is increased. Comparative analysis that the effect of flue gas recycling and other process factors has on generation of NO and N 2 O during combustion in air, oxygen, and CO 2 has been made. It is shown that, owing to recycling, the fractions of NO x and N 2 O generated from fuel nitrogen during oxy-fuel combustion are significantly lower than those during combustion in air. Mathematical simulation of various complicated processes related to generation and suppression of hazardous pollutant emissions has recently become a generally accepted method that allows the prediction at relatively low costs of such processes during the combustion of various fuels. However, as applied to new technologies for combustion of various biomass types and cofiring of coal and biomass, these methods have not yet been properly developed. The most preferable mathematical models for calculating nitrogen oxide emissions are provided, and the predicted results are compared with experimental data. The lines of further research, predominantly in the simulation of cofiring of coal and biomass, are outlined. It is shown that comprehensive investigations of generation and suppression of hazardous pollutant emissions during cofiring of coals and biomass of various kinds, in particular, during oxy-fuel combustion with recycled CO 2 are of topical interest.
ISSN:	0040-6015 1555-6301
DOI:	10.1134/S0040601519120048