Numerical study on combustion characteristics and heat flux distributions of 660‐MW ultra‐supercritical double‐reheat tower‐type boiler

Deng, Lei; Zhang, Yan; Ma, Shihao; Zhu, Zhengrong; Liu, Hu; Belošević, Srdjan; Tomanović, Ivan; Che, Defu

doi:10.1002/apj.2631

Cited by 4 publications

(3 citation statements)

References 45 publications

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“…With increasing α, a larger amount of air is sent into the boiler to support combustion and release more heat, which makes the NO x emissions at different altitudes increase. The tendency of NO x emissions is in accordance with the conclusions draw by Zhang et al 28 …”

Section: Resultssupporting

confidence: 91%

The influence of altitude on combustion characteristics within gas‐fired boiler by numerical simulation

Zhang

et al. 2023

Asia-Pacific J Chem Eng

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The reduced atmospheric pressure and oxygen mass concentration at high altitudes have brought tremendous problems to the operation of gas‐fired boiler, mainly due to their influence on gas combustion and flow within furnace. Boilers designed for plateau region generally experience insufficient output, incomplete combustion, and reduced thermal efficiency when operating at high altitudes. However, the impacts from increasing altitude to the combustion characteristics within furnace are still ambiguous, which greatly hampers the boiler design for high‐altitude area. In this paper, the influences of altitude on the gas combustion characteristics within furnace were explored by using the computational fluid dynamics (CFD) method. The simulation shows that when altitude rises from 0 to 4000 m, the flame length and width increase as well as the temperature within furnace, but the burnout rate decreases due to the reduced residence time. The furnace length and diameter of the boiler designed for high altitudes should be appropriately increased to avoid the high temperature flame from scouring the back tube sheet and the furnace liner. While the CO emissions are generally very low, an increasing trend with altitude was observed. In addition, for each 1000 m of altitude rise, the NOx emissions increase by about 14 mg·m−3 at 100% loads and α = 1.05. The present work reveals the influence of altitude on combustion characteristics within gas‐fired boiler, which can guide the design and operation of the gas‐fired boiler at high altitudes.

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Section: Resultssupporting

confidence: 91%

The influence of altitude on combustion characteristics within gas‐fired boiler by numerical simulation

Zhang

et al. 2023

Asia-Pacific J Chem Eng

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“…In the second direction, swirl burners with a hightemper ature flame core are retained, the reduction of nitrogen oxides generation is achieved by the lack of oxidant in the core, and the combustion of the generated CO occurs in the tertiary air supplied by the level above (OFA technology). This method is suitable for both subbituminous [13] and lowreactive coals [14]. However, in CFD modelling studies of such multistage combustion, such as [13,14], detailed simulations of the pro cesses in the swirl burner are usually sacrificed for the sake of a detailed description of the interaction of the flame with the secondary and tertiary oxidant streams.…”

mentioning

confidence: 99%

“…This method is suitable for both subbituminous [13] and lowreactive coals [14]. However, in CFD modelling studies of such multistage combustion, such as [13,14], detailed simulations of the pro cesses in the swirl burner are usually sacrificed for the sake of a detailed description of the interaction of the flame with the secondary and tertiary oxidant streams.…”

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confidence: 99%

CFD-modeling of critical deviations of combustion processes in pulverized coal boilers. Part 1. Construction of the TPP-210A boiler calculation model

Bondzyk,

Baranyuk,

Vorobyov

et al. 2024

Nauk. visn. nat. hirn. univ.

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Purpose. Development of a mathematical model for predicting critical deviations of furnace processes during the operation of anthracite boilers converted to burning sub-bituminous coal, including in non-design modes of operation. Verification of the calculation model of the TPP-210A boiler of the 300 MW power unit on the design fuel – anthracite for further analysis of its operation on sub-bituminous coal. Methodology. Modelling of solid fuel combustion was performed with the help of finite-element CFD models of the boiler unit in the ANSYS-Fluent software complex with the determination of the relevant characteristics of the boiler. Findings. Finite-element CFD models were developed according to the working drawings of the TPP-210A boiler and its burner device, reconstructed for burning sub-bituminous coal. Verification of the results of CFD modeling was carried out for the case of burning the design fuel – anthracite in the design operating modes. It is shown that the discrepancy between the results and the experiment does not exceed 6.5 %, which allows the use of the developed computer model for simulating the burning of sub-bituminous coal, including in non-design operating modes. The obtained results are the basis for further calculations of the operation of the TPP-210A boiler of the 300 MW power unit on sub-bituminous coal with the determination and minimization of the factors of critical deviations of furnace processes that lead to thermal damage of wall screens. Originality. For the first time, CFD modelling has taken into account all the design features of the burner devices of the TPP-210A boiler, reconstructed for burning sub-bituminous coal with the introduction of a steam ejector of a high-concentration dust pipe under rarefaction to the central air channel. For the first time, the distribution of thermal resistances has been applied as boundary conditions on the walls of the fuel tank for the case of burning sub-bituminous coal. The validity of these approaches was confirmed by the verification of the results. Practical value. The verified computer model of the TPP-210A boiler of the 300 MW power unit converted to burning sub-bituminous coal will allow determining and minimizing the factors of critical deviations of furnace processes which lead to thermal damage of wall screens. This will contribute to increasing the reliability and improving the technical and economic indicators of the boilers of the Trypilska TPP, where 3 such boilers are operating, and other power plants (Zmiyivska, Kryvorizka, Prydniprovska), where similar anthracite boilers are planned to be converted to sub-bituminous coal.

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Effects of flue gas recirculation on combustion and heat flux distribution in 660 MW double-reheat tower-type boiler

Deng

Dong

Bai

et al. 2022

Fuel

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Numerical study on combustion characteristics and heat flux distributions of 660‐MW ultra‐supercritical double‐reheat tower‐type boiler

Cited by 4 publications

References 45 publications

The influence of altitude on combustion characteristics within gas‐fired boiler by numerical simulation

The influence of altitude on combustion characteristics within gas‐fired boiler by numerical simulation

CFD-modeling of critical deviations of combustion processes in pulverized coal boilers. Part 1. Construction of the TPP-210A boiler calculation model

Effects of flue gas recirculation on combustion and heat flux distribution in 660 MW double-reheat tower-type boiler

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