Particle sticking behavior near the throat of a low-NOx axial-swirl coal burner

Li, Zhengqi; Zeng, Lingyan; Zhao, Guangbo; Shen, Shanping; Zhang, Fucheng

doi:10.1016/j.apenergy.2010.08.015

Cited by 24 publications

(10 citation statements)

References 37 publications

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“…Slagging characteristics are influenced by coal type (ash constituents, fusion temperature, distribution of mineral matter in coal, etc. ), reaction atmosphere, particle temperature, flow dynamics, and so forth [17]. To this end, initiation and growth during slag formation in gasification or combustion were studied by modeling and were elucidated [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Understanding mineral behaviors during anthracite fluidized-bed gasification based on slag characteristics

Huang

et al. 2014

Applied Energy

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Section: Introductionmentioning

confidence: 99%

Understanding mineral behaviors during anthracite fluidized-bed gasification based on slag characteristics

Huang

et al. 2014

Applied Energy

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“…Gas turbulence was specifically taken into account by the so-called realizable k À e model [25][26][27]. In the area close to the wall, where the flow is laminar, the standard wall function method was adopted and the particle trajectory model was chosen to simulate gas-solid two-phase flow.…”

Section: Mathematical Models and Calculation Methodsmentioning

confidence: 99%

Modeling the Occurrence and Methods of Reducing Thermal Deviations of Upper Furnace Heating Surfaces in a 1000 MW Dual Circle Tangential Firing Single Furnace Ultra-Supercritical Boiler

Liu

Sha

et al. 2014

Numerical Heat Transfer, Part A: Applications

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The FLUENT computational fluid dynamics software package was used to model outlet velocity and temperature inhomogeneity in a 1000 MW dual circle tangential firing single furnace ultra-supercritical boiler. These computations allowed a theoretical analysis of thermal deviations at the furnace outlet and suggested means of reducing such deviations. This work involved study of radiative and convective heat transfer of the upper furnace platen superheaters, the radiative-convective heating surfaces above the furnace nose and the convective heating surfaces in the horizontal flue. The results demonstrated that the radiant heat load of the heating surfaces of the platen superheaters is related to the sectional dimensions of the furnace and exhibits a bimodal distribution in the boiler modeled during this work. It was also determined that a large recirculation zone is formed in the central section of the horizontal flue owing to velocity superposition. After establishing the thermal load distribution characteristics and the causes of thermal deviations at the various heating surfaces, further modeling was performed to assess the extent to which thermal deviations could be reduced by decreasing residual rotation at the furnace outlet via horizontally swinging the over fire air (OFA). The effects of OFA swing angles on velocity and temperature inhomogeneity at the furnace outlet were subsequently analyzed, and an OFA swing of À10 was found to be optimal based on considerations of thermal deviations at the furnace outlet, the airflow field in the furnace, and safe operation of the boiler.

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“…54 Air staging is primarily applied to utility boilers such as overfire air (OFA). Many studies have investigated low-NOx burners and air staging with respect to the effects of the geometries and boiler operating conditions, including the burner geometry and fuel equivalence ratio, 55,56 air ratio of secondary and OFA, 57 stoichiometric ratio, 58 and air temperature. 59 2.2.2.…”

Section: Cfd Modeling Of Hele Coal Combustionmentioning

confidence: 99%

“…Various parameters must be considered to evaluate their effects on low-NOx combustion in different boilers. Thus, although experimental investigations have been widely conducted, ,,− numerical approaches have also been frequently employed to determine the optimum NOx reduction conditions.…”

Section: Cfd Modeling Of Hele Coal Combustionmentioning

confidence: 99%

A Review of the Numerical Modeling of Pulverized Coal Combustion for High-Efficiency, Low-Emissions (HELE) Power Generation

et al. 2021

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High-efficiency, low-emissions (HELE) coal-fired power plant technologies operate with a higher thermal efficiency of the steam cycle for coal-fired power generation, reducing CO2 emissions per unit energy generation. They represent some of the primary and intermediate solutions to the world’s energy security. Extensive numerical modeling efforts have been undertaken over the past several decades, which have increased our understanding of the technical problems in HELE boilers, including combustion and boiler performance optimization, ash deposition, and material problems at higher operating temperatures and pressures. Overall, the differences in the physical and chemical models, boiler performance, and ash deposition of oxy-fuel combustion in HELE boilers that recirculate CO2 and H2O in the boilers are also discussed in comparison with the combustion of coal in the air. This Review comprehensively summarizes the current research on numerical modeling to offer a better understanding of the technical aspects and provides future research requirements of HELE coal-fired boilers, including boiler performance optimization, ash deposition, and material problems. The effects of changes in the configuration and operating conditions are discussed, focusing on the optimization of boiler performance in aspects such as unburnt carbon and NOx emissions. The paper also reviews the retrofit and optimization of operating conditions and the burner geometry with the low-NOx coal combustion technologies necessary to operate the HELE power plants. In terms of ash deposition, the development of submodels, including particle sticking and impacting behaviors and their effects on the deposit growth predictions under different temperatures, are discussed. Numerical models of the material oxidation and creep in the austenitic and nickel-based alloys generally used in HELE conditions have been developed using the finite element method to predict the availability of advanced alloys and creep life in the actual service time of the boiler parts. The predictions of oxide scale growth and exfoliation on the steam-side and fire-side and the creep strength are analyzed. The review also identifies some further research requirements in numerical modeling to achieve the optimization of coal combustion processes and address the technical problems in advanced HELE power plant operations.

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Particle sticking behavior near the throat of a low-NOx axial-swirl coal burner

Cited by 24 publications

References 37 publications

Understanding mineral behaviors during anthracite fluidized-bed gasification based on slag characteristics

Understanding mineral behaviors during anthracite fluidized-bed gasification based on slag characteristics

Modeling the Occurrence and Methods of Reducing Thermal Deviations of Upper Furnace Heating Surfaces in a 1000 MW Dual Circle Tangential Firing Single Furnace Ultra-Supercritical Boiler

A Review of the Numerical Modeling of Pulverized Coal Combustion for High-Efficiency, Low-Emissions (HELE) Power Generation

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