Simulation of the gas temperature deviation in large-scale tangential coal fired utility boilers

Xu, Minghou; Yuan, Jianwei; Ding, Shuiting; Han-ding, Cao

doi:10.1016/s0045-7825(97)00196-5

Cited by 41 publications

(14 citation statements)

References 5 publications

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“…One category of solution involves reduction of the heat transfer deviation from the side of the steam by optimizing the structure and re-arranging the platen heat exchanger [4]. The other involves weakening the residual swirling intensity, usually by opposing the tangential swirling direction of the air jet flow from the over fire air (OFA) or the separated over fire air (SOFA) [14][15][16]. In addition, the application of a dual-tangential-circle firing system within a single chamber is also helpful to decrease the residual swirling intensity via two counteracting tangential flue gas flow systems in opposite directions [17,18].…”

Section: Introductionmentioning

confidence: 99%

Influence of vertical burner tilt angle on the gas temperature deviation in a 700 MW low NO x tangentially fired pulverised-coal boiler

Tian

Zhong

Tan

et al. 2015

Fuel Processing Technology

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Section: Introductionmentioning

confidence: 99%

Influence of vertical burner tilt angle on the gas temperature deviation in a 700 MW low NO x tangentially fired pulverised-coal boiler

Tian

Zhong

Tan

et al. 2015

Fuel Processing Technology

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“…In the early years, the importance of false diffusion was not well recognized and rectangular mesh with lower-order convective schemes was widely used to simulate tangentially fired combustion. In recent years, the false diffusion effect has been addressed with the rapid developments of computational techniques and computer hardware [43][44][45][46]. Higher-order convective schemes [47][48][49][50], mesh adjusting methods [51][52][53][54][55] and artificial viscosity methods [56][57][58] have been developed to prevent the false diffusion caused by convective schemes and rectangular meshes in TFF combustion simulations.…”

Section: The Coal Combustion Simulations and Diffusion Effects In Utimentioning

confidence: 99%

False diffusion in numerical simulation of combustion processes in tangential-fired furnace

Wang

Zhuo

et al. 2007

J Mech Sci Technol

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Numerical simulation serves as one of the most important tools for analyzing coal combustion in Tangentially Fired Fumaces (TFF) with NUMERICAL FALSE DIFFUSION as one key problem that degrades the simulation accuracy, especially for complex flow patterns. False diffusion often completely compromises the accuracy, leading to erroneous predictions. This paper reviews various methods to reduce the numerical diffusion. In computational fluid dynamics (CFD), false diffusion originates from a truncation error of the Taylor series approximation of the derivative and multidimensional discretization effects. Higher-order upwind convective schemes were designed to reduce truncation errors, while grid line adjusting methods were developed to reduce crossflow diffusion. This paper compares numerical and experimental results for isothermal flows to evaluate these methods. Results with the standard upwind scheme in a rectangular Cartesian mesh are compared with results in body-fitted meshes for comprehensive combustion processes in a TFF. Analysis of the false ditfusion effect in the x, y, z directions and the artificial viscosity distribution in a rectangular mesh shows where the false diffusion overtakes the real physical diffusion and where the mesh must be refined or grid line must be adjusted to improve TFF combustion simulations.

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“…In recent years, computational fluid dynamics (CFD) codes in association with combustion, heat transfer and emission predictions are becoming more frequently used by combustion equipment designers (Fiveland and Latham, 1993;Weber et al, 1995;Boyd and Kent, 1986;Lockwood et al, 1988;Fiveland and Wessel, 1988;Carvalho and Coelho, 1991;Azevedo et al, 1994;Xu et al, 1998;Costa et al, 1991;Lockwood and Shah, 1981;Coimbra et al, 1994;Yuan et al, 1995;Xu et al, 1996;Coelho and Carvalho, 1993;Xu et al, 1999;Bundschuh et al, 1999;Chudnovsky et al, 1999). With the fast development of computer hardware, the mathematical modelling methodology is now feasible and becoming a new engineering tool ideal for evaluating design options, and it may be further used to assess the effect of boiler operational changes.…”

Section: Introductionmentioning

confidence: 99%

An advanced model to assess fouling and slagging in coal fired boilers

Azevedo

et al. 2002

Int. J. Energy Res.

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SUMMARYThe assessment of the influence of fouling and slagging on the heat transfer in utility boilers has obtained significant interest both during boiler design and operation. This paper presents a strategy to investigate this influence by introducing heat resistance to represent fouling and slagging on furnace walls. The evaluation of this strategy was performed using the plant heat flux reading data together with a 3-D computational fluid dynamics code. The model considers the influence of the operating conditions to the incident heat fluxes and these are used to assess the heat transfer resistance from the measured absorbed heat fluxes.

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Simulation of the gas temperature deviation in large-scale tangential coal fired utility boilers

Cited by 41 publications

References 5 publications

Influence of vertical burner tilt angle on the gas temperature deviation in a 700 MW low NO x tangentially fired pulverised-coal boiler

Influence of vertical burner tilt angle on the gas temperature deviation in a 700 MW low NO x tangentially fired pulverised-coal boiler

False diffusion in numerical simulation of combustion processes in tangential-fired furnace

An advanced model to assess fouling and slagging in coal fired boilers

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