THE INVESTIGATION OF THE EFFICIENCY OF THE NITROGEN OXIDES REDUCTION BY ADVANCED REBURNING METHOD APPLICATION WITH THE COAL DUST AS A REBURNING FUEL

The investigation of the influence of the low reactivity reburning fuel coal dust on the simultaneous processes of the nitrogen oxides reduction in accordance with the mechanisms Reburning and selective non-catalytic reduction was carried out. The study showed the possibility to reduce the nitrogen oxides emissions up to 80 % compared with single-stage coal combustion.

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APPLICATION OF THE BIOMASS PYROLISIS PRODUCTS AS A REBURNING FUEL FOR NITROGEN OXIDES REDUCTION: TESTING THE CHEMICAL KINETICS MECHANISM

Thermophysics and Thermal Power Engineering ◽

10.31472/ttpe.2.2020.10 ◽

2020 ◽

Vol 42 (2) ◽

pp. 92-98

Author(s):

S.G. Kobzar ◽

A.A. Khalatov

Keyword(s):

Nitrogen Oxides ◽

Chemical Kinetics ◽

Coal Combustion ◽

Mass Fraction ◽

Biomass Pyrolysis ◽

Pyrolysis Gas ◽

Pyrolysis Products ◽

Nitrogen Oxides Reduction ◽

Kinetics Of ◽

Pyrolysis Gases

The mechanisms of chemical kinetics of the Reburning process using pyrolysis gases as a reburn fuel are determined. It has been shown that CO, CO2, H2 have very little effect on the reduction of the nitrogen oxides under conditions characteristic for the coal combustion, and hydrocarbons play the major contribution to the reduction of the nitrogen oxides. The results of the test calculations showed that the process of the nitrogen oxides reduction by the biomass pyrolysis products can be calculated by a simplified mechanism of the chemical kinetics of the Reburning process by replacing hydrocarbons with one substance (with a close carbon/hydrogen ratio as in the real pyrolysis gas mixture), provided that the mass fraction of carbon is preserved, fed to the reduction of nitrogen oxides unchanged. This approach significantly reduces machine time and calculates the nitrogen oxides reducing efficiency by Reburning technology with an accuracy of 17%.

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THE STUDY AND THE MECHANISM OF NITROGEN OXIDES’ FORMATION IN COMBUSTION OF FOSSIL FUELS

Facta Universitatis Series Mechanical Engineering ◽

10.22190/fume171114026o ◽

2018 ◽

Vol 16 (2) ◽

pp. 273 ◽

Cited By ~ 4

Author(s):

Bulbul Ongar ◽

Iliya K. Iliev ◽

Vlastimir Nikolić ◽

Aleksandar Milašinović

Keyword(s):

Nitric Oxide ◽

Nitrogen Oxides ◽

Coal Combustion ◽

Fossil Fuels ◽

Coal Dust ◽

Chemical Reduction ◽

Molecular Nitrogen ◽

Combustion Process ◽

Nitric Oxides ◽

Nitric Oxide Emissions

The burning of all fossil fuels is accompanied by the production of large quantities of nitrogen oxides. Nitrogen oxide from coal combustion is formed from the molecular nitrogen in the air and the nitrogen contained in the fuel. In accordance with the mechanism of formation of nitric oxide from fuel, it is desirable to increase the concentration of coal dust in the flame. The thermal regime of combustion accelerates the release of volatiles, with flames spreading out and the coke residue contributes to the chemical reduction of NOx. In this work we consider the specific issues of the formation mechanism of NOx fuel and ways to reduce their atmospheric emissions. Presented are results from the calculation of the influence of the following on the level of nitric oxides during coal combustion: temperature, oxygen concentration and time of release of fuel nitrogen. It has been established that the influence of nitric oxide fuel on the total nitric oxide emissions is more noticeable at low temperatures of the combustion process.

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