Effect of staged combustion on low NOx emission from an industrial-scale fuel oil combustor in South Korea

Myung Soo Kang, Hyo Jae Jeong, Massoud Massoudi Farid, Jungho Hwang

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Staged combustion induces the reduction of NO to generate N2 through the formation of a fuel-rich zone upstream of the flue gas and utilizes the unburned gas by supplying sufficient air for combustion downstream of the flue gas. Since power generation schedules are very constrained and only specific and limited tests can be planned and executed, the use of numerical simulations is currently more suitable for analyzing these large and complex systems. In this study, computational fluid dynamics (CFD) simulation was performed for an industrial-scale fuel oil combustor to determine the effect of staged combustion on NOx emissions. The fuel oil combustor is a 400-MWe opposite-wall unit located in Ulsan, South Korea, where high-sulfur fuel oil (Bunker-C with 2.5% sulfur content) is used. The combustor has a height of 56 m and a cross-sectional area of 10 × 12 m2. Water wall tubes (evaporator) are located on the wall of the lower part of the combustor and sixteen burners are located at four different axial positions. The system is comprised of two superheaters, two reheaters, and an economizer located in the upper part of the combustor. Staged combustion is realized by changing the equivalence ratio of each burner. Under the initial staged combustion conditions adopted by the Ulsan power plant, the concentration of NOx at the exit of the combustor was calculated to be 362 ppm, which was still high even after selective catalytic reduction treatment. However, when more stringent staged combustion conditions were applied, the predicted concentration of NOx decreased to 309 ppm, which is lower than the mandated NOx concentration at the combustor exit.

Original languageEnglish
Pages (from-to)282-289
Number of pages8
JournalFuel
Volume210
DOIs
Publication statusPublished - 2017 Jan 1

Fingerprint

Fuel Oils
Fuel oils
Combustors
Fuel burners
Flue gases
Sulfur
Economizers
Superheaters
Selective catalytic reduction
Computer simulation
Evaporators
Power generation
Large scale systems
Power plants
Computational fluid dynamics
Gases
Water

All Science Journal Classification (ASJC) codes

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

Cite this

Kang, Myung Soo ; Jeong, Hyo Jae ; Massoudi Farid, Massoud ; Hwang, Jungho. / Effect of staged combustion on low NOx emission from an industrial-scale fuel oil combustor in South Korea. In: Fuel. 2017 ; Vol. 210. pp. 282-289.
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Effect of staged combustion on low NOx emission from an industrial-scale fuel oil combustor in South Korea. / Kang, Myung Soo; Jeong, Hyo Jae; Massoudi Farid, Massoud; Hwang, Jungho.

In: Fuel, Vol. 210, 01.01.2017, p. 282-289.

Research output: Contribution to journalArticle

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AU - Kang, Myung Soo

AU - Jeong, Hyo Jae

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AB - Staged combustion induces the reduction of NO to generate N2 through the formation of a fuel-rich zone upstream of the flue gas and utilizes the unburned gas by supplying sufficient air for combustion downstream of the flue gas. Since power generation schedules are very constrained and only specific and limited tests can be planned and executed, the use of numerical simulations is currently more suitable for analyzing these large and complex systems. In this study, computational fluid dynamics (CFD) simulation was performed for an industrial-scale fuel oil combustor to determine the effect of staged combustion on NOx emissions. The fuel oil combustor is a 400-MWe opposite-wall unit located in Ulsan, South Korea, where high-sulfur fuel oil (Bunker-C with 2.5% sulfur content) is used. The combustor has a height of 56 m and a cross-sectional area of 10 × 12 m2. Water wall tubes (evaporator) are located on the wall of the lower part of the combustor and sixteen burners are located at four different axial positions. The system is comprised of two superheaters, two reheaters, and an economizer located in the upper part of the combustor. Staged combustion is realized by changing the equivalence ratio of each burner. Under the initial staged combustion conditions adopted by the Ulsan power plant, the concentration of NOx at the exit of the combustor was calculated to be 362 ppm, which was still high even after selective catalytic reduction treatment. However, when more stringent staged combustion conditions were applied, the predicted concentration of NOx decreased to 309 ppm, which is lower than the mandated NOx concentration at the combustor exit.

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