Effect of CO2 and H2O Gasifications on the Burning Behavior and NO Release Process of Pulverized Coal at Low Oxygen Concentrations during Oxy-Fuel Combustion

Lei, Ming; Sun, Cen; Wang, Chunbo

doi:10.1061/(ASCE)EY.1943-7897.0000598

Technical Papers

Jan 29, 2019

Effect of ${CO}_{2}$ and $H_{2} O$ Gasifications on the Burning Behavior and NO Release Process of Pulverized Coal at Low Oxygen Concentrations during Oxy-Fuel Combustion

Authors: Ming Lei [email protected], Cen Sun [email protected], and Chunbo Wang [email protected]Author Affiliations

Publication: Journal of Energy Engineering

Volume 145, Issue 2

https://doi.org/10.1061/(ASCE)EY.1943-7897.0000598

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Abstract

Through the use of a thermogravimetric analyzer and a fixed-bed reactor, the effects of

{CO}_{2}

and

H_{2} O

gasifications on oxy combustion and NO emission of pulverized coal at low oxygen concentrations were investigated by comparing the burning behaviors and NO release processes in

O_{2} / N_{2}

,

O_{2} / {CO}_{2}

, and

O_{2} / {CO}_{2} / H_{2} O

mixtures (the latter two represented oxy-fuel combustion without and with steam addition, respectively). The thermogravimetric analyses show that at

5 % O_{2}

concentration, the burning rate of coal samples decreased in the order of

5 % O_{2} / 95 % N_{2}

,

5 % O_{2} / 95 % {CO}_{2}

, and

5 % O_{2} / 20 % H_{2} O / 75 % {CO}_{2}

(molar concentration). As the oxygen concentration dropped to 2% because of the influence of

{CO}_{2}

and

H_{2} O

gasification, the overall reaction rate of coal samples increased in the same order at above 800°C. At 2%

O_{2}

concentration, because of the effect of

{CO}_{2}

gasification the overall reaction rate of char samples in the

2 % O_{2} / 98 % {CO}_{2}

mixture was accelerated and exceeded the burning rate in the

2 % O_{2} / 98 % N_{2}

mixture with increasing temperature. And the overall reaction rate of char samples in

2 % O_{2} / 20 % H_{2} O / 78 % {CO}_{2}

further increased due to the enhanced

{CO}_{2}

and

H_{2} O

co-gasification. The fixed-bed reactor tests showed that the NO emissions of pulverized coal in the

O_{2} / N_{2}

mixture were always higher than those in the

O_{2} / {CO}_{2}

mixture, regardless of temperature and

O_{2}

concentration. At 1,000°C and

2 % O_{2}

concentration, the NO emission in

2 % O_{2} / 20 % H_{2} O / 78 % {CO}_{2}

(

5.64 mg / g

) was higher than that in

2 % O_{2} / 98 % {CO}_{2}

(

5.13 mg / g

) because the additional nitrogen precursors (HCN and

{NH}_{3}

) generated by

H_{2} O

gasification were oxidized to NO easily and quickly. However, increasing oxygen concentration to 5%, because of the weakened effect of

H_{2} O

gasification, NO emission in

5 % O_{2} / 20 % H_{2} O / 75 % {CO}_{2}

(

5.98 mg / g

) decreased compared to that in

5 % O_{2} / 95 % {CO}_{2}

(

6.39 mg / g

). In addition, because the effect of

H_{2} O

gasification was enhanced at 1,200°C, regardless of the

O_{2}

concentration, the NO emissions in the

O_{2} / {CO}_{2} / H_{2} O

mixture were always higher than those in the

O_{2} / {CO}_{2}

mixture.

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Acknowledgments

This work was supported by the National Key R&D Program of China (2016YFB0600701), the Hebei Province Natural Science Foundation (E2016502094), and the Fundamental Research Funds for the Central Universities (2017MS120).

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Information & Authors

Information

Published In

Journal of Energy Engineering

Volume 145 • Issue 2 • April 2019

Copyright

History

Received: Jul 2, 2018

Accepted: Oct 19, 2018

Published online: Jan 29, 2019

Published in print: Apr 1, 2019

Discussion open until: Jun 29, 2019

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Authors

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Ming Lei [email protected]

Lecturer, Thermal Engineering, School of Energy and Power Engineering, North China Electric Power Univ., Baoding 071003, China (corresponding author). Email: [email protected]

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Cen Sun [email protected]

Graduate Student, Thermal Engineering, School of Energy and Power Engineering, North China Electric Power Univ., Baoding 071003, China. Email: [email protected]

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Chunbo Wang [email protected]

Professor, Thermal Engineering, School of Energy and Power Engineering, North China Electric Power Univ., Baoding 071003, China. Email: [email protected]

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