Large-eddy simulation of pulverized coal jet flame - Effect of oxygen concentration on NOx formation

Masaya Muto, Hiroaki Watanabe, Ryoichi Kurose, Satoru Komori, Saravanan Balusamy, Simone Hochgreb

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Large-eddy simulation is applied to a laboratory-scale open-type pulverized coal flame generated by a triple stream burner, and the NO production and reduction in oxy-fuel condition are investigated for the first time. Pulverized Cerrejon coal which is classified as bituminous coal is used as a fuel. The results show that regardless of the equivalence ratio, as the O2 concentration increases from 21% to 40%, O2 consumption becomes marked because gas temperature rises and oxidation reaction is enhanced by the higher concentration of O2. Also, NO is formed rapidly due to the oxidation reaction of nitrogen from volatile matter of coal, and its concentration reaches a few hundred ppm further downstream. After the rapid formation, in the case of equivalence ratio larger than unity, NO decreases, because the reducing atmosphere becomes dominant due to the lack of O2. The trend becomes significant as the O2 concentration in the carrier gas increases from 21% to 40%. In the case of equivalence ratio less than unity, on the other hand, NO does not decrease clearly, because the oxidizing atmosphere contributes to the further formation of NO. Present study shows the usefulness of the large-eddy simulations for predicting the characteristics of pulverized coal flames.

Original languageEnglish
Pages (from-to)152-163
Number of pages12
JournalFuel
Volume142
DOIs
Publication statusPublished - Feb 15 2015
Externally publishedYes

Fingerprint

Coal
Large eddy simulation
Oxygen
Oxidation
Gases
Bituminous coal
Fuel burners
Nitrogen
Temperature

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

Cite this

Large-eddy simulation of pulverized coal jet flame - Effect of oxygen concentration on NOx formation. / Muto, Masaya; Watanabe, Hiroaki; Kurose, Ryoichi; Komori, Satoru; Balusamy, Saravanan; Hochgreb, Simone.

In: Fuel, Vol. 142, 15.02.2015, p. 152-163.

Research output: Contribution to journalArticle

Muto, Masaya ; Watanabe, Hiroaki ; Kurose, Ryoichi ; Komori, Satoru ; Balusamy, Saravanan ; Hochgreb, Simone. / Large-eddy simulation of pulverized coal jet flame - Effect of oxygen concentration on NOx formation. In: Fuel. 2015 ; Vol. 142. pp. 152-163.
@article{042e63e8d4ad4af8b2eb083995b036c4,
title = "Large-eddy simulation of pulverized coal jet flame - Effect of oxygen concentration on NOx formation",
abstract = "Large-eddy simulation is applied to a laboratory-scale open-type pulverized coal flame generated by a triple stream burner, and the NO production and reduction in oxy-fuel condition are investigated for the first time. Pulverized Cerrejon coal which is classified as bituminous coal is used as a fuel. The results show that regardless of the equivalence ratio, as the O2 concentration increases from 21{\%} to 40{\%}, O2 consumption becomes marked because gas temperature rises and oxidation reaction is enhanced by the higher concentration of O2. Also, NO is formed rapidly due to the oxidation reaction of nitrogen from volatile matter of coal, and its concentration reaches a few hundred ppm further downstream. After the rapid formation, in the case of equivalence ratio larger than unity, NO decreases, because the reducing atmosphere becomes dominant due to the lack of O2. The trend becomes significant as the O2 concentration in the carrier gas increases from 21{\%} to 40{\%}. In the case of equivalence ratio less than unity, on the other hand, NO does not decrease clearly, because the oxidizing atmosphere contributes to the further formation of NO. Present study shows the usefulness of the large-eddy simulations for predicting the characteristics of pulverized coal flames.",
author = "Masaya Muto and Hiroaki Watanabe and Ryoichi Kurose and Satoru Komori and Saravanan Balusamy and Simone Hochgreb",
year = "2015",
month = "2",
day = "15",
doi = "10.1016/j.fuel.2014.10.069",
language = "English",
volume = "142",
pages = "152--163",
journal = "Fuel",
issn = "0016-2361",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Large-eddy simulation of pulverized coal jet flame - Effect of oxygen concentration on NOx formation

AU - Muto, Masaya

AU - Watanabe, Hiroaki

AU - Kurose, Ryoichi

AU - Komori, Satoru

AU - Balusamy, Saravanan

AU - Hochgreb, Simone

PY - 2015/2/15

Y1 - 2015/2/15

N2 - Large-eddy simulation is applied to a laboratory-scale open-type pulverized coal flame generated by a triple stream burner, and the NO production and reduction in oxy-fuel condition are investigated for the first time. Pulverized Cerrejon coal which is classified as bituminous coal is used as a fuel. The results show that regardless of the equivalence ratio, as the O2 concentration increases from 21% to 40%, O2 consumption becomes marked because gas temperature rises and oxidation reaction is enhanced by the higher concentration of O2. Also, NO is formed rapidly due to the oxidation reaction of nitrogen from volatile matter of coal, and its concentration reaches a few hundred ppm further downstream. After the rapid formation, in the case of equivalence ratio larger than unity, NO decreases, because the reducing atmosphere becomes dominant due to the lack of O2. The trend becomes significant as the O2 concentration in the carrier gas increases from 21% to 40%. In the case of equivalence ratio less than unity, on the other hand, NO does not decrease clearly, because the oxidizing atmosphere contributes to the further formation of NO. Present study shows the usefulness of the large-eddy simulations for predicting the characteristics of pulverized coal flames.

AB - Large-eddy simulation is applied to a laboratory-scale open-type pulverized coal flame generated by a triple stream burner, and the NO production and reduction in oxy-fuel condition are investigated for the first time. Pulverized Cerrejon coal which is classified as bituminous coal is used as a fuel. The results show that regardless of the equivalence ratio, as the O2 concentration increases from 21% to 40%, O2 consumption becomes marked because gas temperature rises and oxidation reaction is enhanced by the higher concentration of O2. Also, NO is formed rapidly due to the oxidation reaction of nitrogen from volatile matter of coal, and its concentration reaches a few hundred ppm further downstream. After the rapid formation, in the case of equivalence ratio larger than unity, NO decreases, because the reducing atmosphere becomes dominant due to the lack of O2. The trend becomes significant as the O2 concentration in the carrier gas increases from 21% to 40%. In the case of equivalence ratio less than unity, on the other hand, NO does not decrease clearly, because the oxidizing atmosphere contributes to the further formation of NO. Present study shows the usefulness of the large-eddy simulations for predicting the characteristics of pulverized coal flames.

UR - http://www.scopus.com/inward/record.url?scp=84911475479&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84911475479&partnerID=8YFLogxK

U2 - 10.1016/j.fuel.2014.10.069

DO - 10.1016/j.fuel.2014.10.069

M3 - Article

AN - SCOPUS:84911475479

VL - 142

SP - 152

EP - 163

JO - Fuel

JF - Fuel

SN - 0016-2361

ER -