Numerical investigation of NOx emissions from a tangentially-fired utility boiler under conventional and overfire air operation

Díez, Luis I.; Cortés, Cristóbal; Pallarés, Javier

doi:10.1016/j.fuel.2007.07.025

Cited by 162 publications

(65 citation statements)

References 16 publications

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“…In this study, the formation of thermal NO x and fuel NO x was considered, while prompt NO x was ignored [25][26][27][28][29]. The thermal NO x was formed by oxidating of N 2 in combustion air and simulated by a set of strongly temperature-dependent chemical reactions [26,43] from extended Zeldovich mechanism.…”

Section: Mathematical Modelsmentioning

confidence: 99%

Influence of vertical burner tilt angle on the gas temperature deviation in a 700 MW low NO x tangentially fired pulverised-coal boiler

Tian

Zhong

Tan

et al. 2015

Fuel Processing Technology

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Section: Mathematical Modelsmentioning

confidence: 99%

Influence of vertical burner tilt angle on the gas temperature deviation in a 700 MW low NO x tangentially fired pulverised-coal boiler

Tian

Zhong

Tan

et al. 2015

Fuel Processing Technology

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“…The contribution of prompt NO x is usually negligible in coal-fired furnaces. 12 Therefore, the other two (thermal NO x and fuel NO x ) are taken into account.…”

Section: Methodsmentioning

confidence: 99%

Optimization of Separated Overfire Air System for a Utility Boiler from a 3-MW Pilot-Scale Facility

et al. 2013

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A 3-MW pilot-scale facility was used to study the effect of separated overfire air (SOFA) on NO x emissions from utility boilers. Experiment results showed that NO x emissions decreased as the excess air ratio in the main combustion zone first decreased, but remained unchanged when the excess air ratio was above a certain value; the carbon content in fly ash increased with the decrease of the excess air ratio in the main combustion zone; NO x emissions decreased and the heat loss due to unburned carbon increased as the residence time in the reduction zone (the zone in the furnace from the middle of combustion zone to the middle of the SOFA zone) increased. Based on the experiment results, a residence time of 2.12−2.68 s is recommended for the reduction zone. Besides, numerical simulations were conducted about the pilot-scale facility and a 600-MW boiler firing the blended coal of Shenhua coal (80 wt %) and Baode coal (20 wt %). The simulations, together with the experiments, showed that there was a critical excess air ratio with value of ∼0.8 for the minimum NO x emissions with relatively low unburned carbon. This critical value, together with the residence time of 2.35 s, which is in the range recommended by our experiments, were used in the retrofit of the 600-MW boiler by SOFA technology, leading to a reduction of NO x emissions as high as 60%.

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“…Increasingly more practical power boiler operating issues are being tackled by CFD with appreciable success. Some examples include slag reduction strategy (Mann et al, 1995), ash deposition (Lee and Lockwood, 1999), NO X formation (Stanmore and Visona, 2000) and (Diez et al, 2008), NO X reburning (Han et al, 2003), coal blending (Chui and LeBlanc, 2001) and boiler tube rupture (Rahimi et al, 2006). Recent CFD studies typically utilize computational grids with cell numbers in the order of millions, demonstrating the advances in hardware and computing power to allow faster and more detailed computations.…”

Section: Improvement Of Boiler Performance Through Modelingmentioning

confidence: 99%

Performance improvement and reduction of emissions from coal-fired utility boilers in China

Chui

Gao

Majeski

et al. 2010

Energy for Sustainable Development

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Numerical investigation of NOx emissions from a tangentially-fired utility boiler under conventional and overfire air operation

Cited by 162 publications

References 16 publications

Influence of vertical burner tilt angle on the gas temperature deviation in a 700 MW low NO x tangentially fired pulverised-coal boiler

Influence of vertical burner tilt angle on the gas temperature deviation in a 700 MW low NO x tangentially fired pulverised-coal boiler

Optimization of Separated Overfire Air System for a Utility Boiler from a 3-MW Pilot-Scale Facility

Performance improvement and reduction of emissions from coal-fired utility boilers in China

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