Numerical study on the influence of platen super-heater on combustion characteristics in a 600 MW tangentially fired pulverized-coal boiler

Chen, Kai; Liu, Xinfei; Qin, Yao

doi:10.2298/tsci200520245c

Cited by 2 publications

(1 citation statement)

References 19 publications

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“…Due to the rise in computational expense, comprehensive boiler modeling is not accessible. For this, researchers performed simulations simply using the combustion furnace, ignoring all superheater tubes, and employing thermal wall boundaries such as wall temperature, emissivity, and heat transfer coefficient [9,11,25]. Similarly, most of the boiler simulations have been conducted by ignoring combustion furnaces as well as superheater tubes by employing constant wall temperature and the porous media approach [26].…”

Section: Is a Pragmaticmentioning

confidence: 99%

Flow and Heat Transfer Characteristics of Superheater Tube of a Pulverized Coal-Fired Boiler Using Conjugate Heat Transfer Modeling

Radhakrishnan,

Park

2024

Energies

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This study is a numerical study to predict the temperature of the heat exchange tubes inside the pulverized coal-fired boiler through the conjugate heat transfer analysis. Due to the aspect ratio and number of tubes inside the pulverized coal-fired boiler, actual tube modeling analysis has rarely been conducted. Most of the research has been conducted through the porous media method, resulting in limited information on the temperature distribution of each tube. However, for the development of a digital twin model for improving the performance of the boiler and reducing maintenance costs, information on the local temperature of the tubes is required. In this study, all the tubes inside the boiler were modeled, and conjugate heat transfer analysis was performed to confirm the local temperature distribution. For this purpose, the analysis was conducted using Fluent 2020 r2, and the analysis model was constructed using more than 300 million structured grids. The calculation was performed considering conjugate heat transfer in the pulverized coal-fired boiler, heat exchange by steam inside the tubes, and conductive heat transfer of the tubes. As a result, it was confirmed that there is a significant deviation in the local temperature for each tube position. Furthermore, the maximum temperature of the PrSH tube ranges widely, between 492 and 532 degrees, depending on the tube’s position. It was observed that the point of the highest temperature inside the tubes also varies for each tube due to the flow of external combustion gas. Based on these results, it is expected that strategic approaches to boiler design and maintenance can be achieved. Furthermore, it is anticipated to contribute to the high efficiency of power facilities by being utilized as basic data for the development of a digital twin model for the boiler.

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Section: Is a Pragmaticmentioning

confidence: 99%

Flow and Heat Transfer Characteristics of Superheater Tube of a Pulverized Coal-Fired Boiler Using Conjugate Heat Transfer Modeling

Radhakrishnan,

Park

2024

Energies

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Numerical Simulation Study on Boiler Combustion Characteristics With Different Volume Fraction of Ventilation Air Methane

Chen

Liu

Deng

et al. 2022

Journal of Energy Resources Technology

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The combustion process of ventilation air methane (VAM) with air in a tangential coal-fired boiler was investigated by the component transport model. The influence of VAM with different volume fractions of methane (CH4) on the combustion characteristics of the boiler was analyzed. The results indicated that the maximum average temperature in the main combustion area increases to 102K, with the increasing volume fraction of CH4 in the VAM. Under the same conditions, the distribution of oxygen (O2) volume fraction showed a trend of decay in the main combustion zone, while carbon monoxide (CO) started to increase. Meanwhile, the NO emission at the over-fire air (OFA) decreased from 974.8mg/m3 to 436.3mg/m3, with a reduction rate of 55.24%. When the VAM with the CH4 volume fraction of 0.75% was fed into the boiler for combustion in different ways, the furnace temperature would rise and the NO emission would decrease. The concentration of CH4 in the VAM should not be less than 0.01%. The analysis results demonstrated that adding the VAM into the boiler combustion can not only save resources and protect the environment but also help to reduce the emission of nitrogen oxides.

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Numerical study on the influence of platen super-heater on combustion characteristics in a 600 MW tangentially fired pulverized-coal boiler

Cited by 2 publications

References 19 publications

Flow and Heat Transfer Characteristics of Superheater Tube of a Pulverized Coal-Fired Boiler Using Conjugate Heat Transfer Modeling

Flow and Heat Transfer Characteristics of Superheater Tube of a Pulverized Coal-Fired Boiler Using Conjugate Heat Transfer Modeling

Numerical Simulation Study on Boiler Combustion Characteristics With Different Volume Fraction of Ventilation Air Methane

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