Influence of combustion system retrofit on NO x  formation characteristics in a 300 MW tangentially fired furnace

Shi, Li; Fu, Zhongguang; Duan, Xuenong; Cheng, Changye; Shen, Yazhou; Liu, Binghan; Wang, Ruixin

doi:10.1016/j.applthermaleng.2015.12.026

Cited by 29 publications

(17 citation statements)

References 33 publications

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“…Due to its high value, only this type is described here. The thermal NO X modeling as a post-processing process is performed after the calculation of flow convergence by the two steps Zeldovich mechanism and extended Zeldovich mechanism [5]. The following equation gives the production rate using this mechanism: …”

Section: Pollution Modelmentioning

confidence: 99%

“…He upgraded boundary conditions and flow models of simulation to accurate, realistic simulations. Shi et al [5] evaluated NO X production in a 300 MW boiler using computational fluid dynamics modeling. They concluded that retrofit of the combustion system not only reduced the total NO X production concentration at the boiler output but also affected the NO X formation region in the furnace.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermodynamic and Numerical Analysis of Tangentially Fired Boiler for Increasing Efficiency and Reducing Environmental Pollution

Abdollahi

Haghighi-Khoshkhoo

2017

Period. Polytech. Mech. Eng.

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IntroductionTangentially fired boilers are mainly used in the power generation industry due to the proper flame distribution and uniform heat flux. These boilers are characterized by the shape of the furnace and the location of fuel and air entrances. They usually have four faces and four corners that fuel and air are supplied from these corners. During the operation due to the flow circulation, the flames are tangentially connected and create a virtual circle called the target circle in the center of the furnace. McKenty et al.[1] developed a model for a dual fuel tangentially fired boiler using computational fluid dynamics and evaluated the flow behavior and NO X production in the furnace. Modlinski [2] developed a model to retrofit an auxiliary boiler using replacement of current burners to a new tangent one using computational fluid dynamics. The purpose of this modeling is to analyze the flow and combustion performance in the furnace. Fang et al. [3] developed the computational fluid dynamics model of multi-fuel combustion in a 200 MW tangentially fired utility boiler. They concluded that multi-fuel combustion is one of the options that can be used to improve combustion behavior and reduce pollutant emissions. Depman [4] updated the computational fluid dynamics model of the industrial boilers of the Iowa University, which had previously been developed. He upgraded boundary conditions and flow models of simulation to accurate, realistic simulations. Shi et al. [5] evaluated NO X production in a 300 MW boiler using computational fluid dynamics modeling. They concluded that retrofit of the combustion system not only reduced the total NO X production concentration at the boiler output but also affected the NO X formation region in the furnace. Tang et al.

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Section: Pollution Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermodynamic and Numerical Analysis of Tangentially Fired Boiler for Increasing Efficiency and Reducing Environmental Pollution

Abdollahi

Haghighi-Khoshkhoo

2017

Period. Polytech. Mech. Eng.

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“…Research efforts continuously focus on modeling NO x formation/destruction reactions in pulverized coal combustion [4][5][6][7][8]. Nitric oxide (NO) is the most abundant NO x from coal combustion.…”

Section: Introductionmentioning

confidence: 99%

The Study and the Mechanism of Nitrogen Oxides’ Formation in Combustion of Fossil Fuels

Ongar¹,

Iliev²,

Nikolić³

et al. 2018

FU Mech Eng

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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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“…Research efforts continuously focus on modeling NO x formation/destruction reactions in pulverized coal combustion [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Nitric oxide (NO) is the most abundant NO x from coal combustion.…”

Section: Introductionmentioning

confidence: 99%

“…As opposed to post-combustion clean-up, in-furnace combustion modifications (primary measures) offer a cost effective and relatively simple method of NO x control [15]. Different NO x removal techniques of this kind are numerically analyzed and optimized [1][2][3][4][5][6][7][8][9][10][11][12][13][14], often in tangentially fired furnaces (TFF) [1][2][3][4][5][6][7][8][9][10][11]. Flow pattern and inlet air velocities effect on NO x emission from TFF was studied in [10].…”

Section: Introductionmentioning

confidence: 99%

Modeling of pulverized coal combustion for in-furnace NOx reduction and flame control

Belošević¹,

Tomanović²,

Crnomarkovic³

et al. 2017

THERM SCI

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A cost-effective reduction of NO x emission from utility boilers firing pulverized coal can be achieved by means of combustion modifications in the furnace. It is also essential to provide the pulverized coal diffusion flame control. Mathematical modeling is regularly used for analysis and optimization of complex turbulent reactive flows and mutually dependent processes in coal combustion furnaces. In the numerical study, predictions were performed by an in-house developed comprehensive three-dimensional differential model of flow, combustion and heat/mass transfer with submodel of the fuel-and thermal-NO formation/destruction reactions. Influence of various operating conditions in the case-study utility boiler tangentially fired furnace, such as distribution of both the fuel and the combustion air over the burners and tiers, fuel-bound nitrogen content and grinding fineness of coal were investigated individually and in combination. Mechanisms of NO formation and depletion were found to be strongly affected by flow, temperature and gas mixture components concentration fields. Proper modifications of combustion process can provide more than 30% of the NO x emission abatement, approaching the corresponding emission limits, with simultaneous control of the flame geometry and position within the furnace. This kind of complex numerical experiments provides conditions for improvements of the power plant furnaces exploitation, with respect to high efficiency, operation flexibility and low emission.

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Influence of combustion system retrofit on NO x formation characteristics in a 300 MW tangentially fired furnace

Cited by 29 publications

References 33 publications

Thermodynamic and Numerical Analysis of Tangentially Fired Boiler for Increasing Efficiency and Reducing Environmental Pollution

Thermodynamic and Numerical Analysis of Tangentially Fired Boiler for Increasing Efficiency and Reducing Environmental Pollution

The Study and the Mechanism of Nitrogen Oxides’ Formation in Combustion of Fossil Fuels

Modeling of pulverized coal combustion for in-furnace NOx reduction and flame control

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