Numerical study of a tangentially fired boiler for reducing steam tube overheating

Tang, Guangwu; Wu, Bin; Johnson, Kurt; Kirk, Albert; Fu, Dong; Zhou, Chenn Q.

doi:10.1016/j.applthermaleng.2016.03.104

Cited by 22 publications

(7 citation statements)

References 36 publications

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“…In this regard, in the present paper, the Realizable k-ε model is used for turbulent flow modeling. The turbulence energy equation (k) and the turbulent dissipation rate (ε) as follows respectively [6]:…”

Section: Turbulence Modelmentioning

confidence: 99%

“…Radiation heat flux in this model is a function of radiation intensity, and its relation is expressed as follows [6]: …”

Section: Radiation Modelmentioning

confidence: 99%

“…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 [6] developed a numerical model for simulating flow and combustion indices in a 200 MW tangentially fired boilers. They investigated wall steam tubes overheating problem and the effect of fuel input percentage on the furnace wall temperature.…”

Section: Introductionmentioning

confidence: 99%

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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: Turbulence Modelmentioning

confidence: 99%

“…Radiation heat flux in this model is a function of radiation intensity, and its relation is expressed as follows [6]: …”

Section: Radiation Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…The NO x , fluid flow and thermal characteristics were calculated by Habib et al [8] for the flow in a tangentially fired furnace under different conditions of tilting burners. Tang et al [9] developed a three-dimensional CFD model to simulate the flow characteristics and combustion process in a 200 MW tangentially fired boiler.…”

Section: Introductionmentioning

confidence: 99%

Influence of nozzle height to width ratio on ignition and NOx emission characteristics of semicoke/bituminous coal blends in a 300 kW pulverized coal-fired furnace

et al. 2021

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To improve the ignition behavior and to reduce the high NO x emissions of blended pulverized fuels (PF) of semicoke (SC), large-scale experiments were conducted in a 300 kW fired furnace at various nozzle settings, i.e., ratios (denoted by h f /b) of the height of the rectangular burner nozzle to its width of 1.65, 2.32, and 3.22. The combustion tests indicate that the flame stability, ignition performance, and fuel burnout ratio were significantly improved at a nozzle setting of h f /b = 2.32. The smaller h f /b delayed ignition and caused the flame to concentrate excessively on the axis of the furnace, while the larger h f /b easily caused the deflection of the pulverized coal flame, and a high-temperature flame zone emerged close to the furnace wall. NO x emissions at the outlet of the primary zone decreased from 447 to 354 mg/m 3 (O 2 = 6%), and the ignition distance decreased from 420 to 246 mm when the h f /b varied from 1.65 to 3.22. Furthermore, the ratio (denoted by S R /S C) of the strong reduction zone area to the combustion reaction zone area was defined experimentally by the CO concentration to evaluate the reduction zone. The S R /S C rose monotonously, but its restraining effects on NO x formation decreased as h f /b increased. The results suggested that in a test furnace, regulating the nozzle h f /b conditions sharply reduces NO x emissions and improves the combustion efficiency of SC blends possessing an appropriate jet rigidity. Keywords rectangular jet burner, nozzle height to width ratio, ignition characteristics, pyrolyzed semicoke (SC) and bituminous blend, NO x formation

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“…Among all heat exchangers, final superheaters and reheaters receive the greatest attention, because their tube walls attain the highest temperatures in the boiler [2]. It has been suggested that the tube overheating problem of these high-temperature heating surfaces results from an unexpected gas temperature deviation (GTD) in the horizontal crossover pass of the boiler [3][4]. In recent years, several researchers [5][6][7][8] have paid attention to revealing the causes and characteristics of this deviation.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity analysis of several operational parameters on gas temperature deviation in a tangential firing boiler

Hu³

et al. 2020

E3S Web Conf.

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In this work, an integrated numerical model combining combustion and fluid heating was established for a 660 MW coal-fired boiler. To validate the accuracy of the developed model, related experiment was also conducted, and shows that the relative errors (REs) of several predicted parameters on both flue-gas side and water-steam side of the boiler are less than 7 %, which meets the requirement of analysis. The results indicate that the effect of SOFA tilt angle on gas temperature deviation (GTD) is greatest, and that of SOFA’s proportion follows; while GTD presents a smallest sensitivity to the concentration of O2. This is because O2 concentration mainly affects the average value of the gas temperature, but barely changes its distribution. By contrast, altering SOFA’s tilt angle and its proportion directly varies the shape, location, and area of the high-temperature and low-temperature regions at the entrance profile of the horizontal crossover pass, so these two factors play a more important role in the variation of GTD.

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Numerical study of a tangentially fired boiler for reducing steam tube overheating

Cited by 22 publications

References 36 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

Influence of nozzle height to width ratio on ignition and NOx emission characteristics of semicoke/bituminous coal blends in a 300 kW pulverized coal-fired furnace

Sensitivity analysis of several operational parameters on gas temperature deviation in a tangential firing boiler

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