Modelling and simulation of fluid flow and heat transfer in the convective zone of a power-generation boiler

Abstract

. Modelling and simulation of fluid-flow and heat transfer in the convective zone of a power-generation boiler. Applied Thermal Engineering, Elsevier, 2008, 28 (5-6) AbstractThe convective zone of a power-station boiler is a complex piece of engineering equipment, which comprises a multiplicity of inter-connected heat-exchanging elements. This paper presents a mathematical model of the convective zone, which allows for the calculation of the shell-side ow and the shell-side, tube-side and tube-wall, thermal elds, and of the shell-tube heat-exchange. The model is solved using conventional CFD techniques, in which the individual tubes are treated as sub-grid features. A geometrical model is used to describe the multiplicity of heat-exchanging structures, and the interconnections between them.The CFD model is rst validated by comparison with simple heat-exchanger geometries which can be solved with analytical methods, and then applied to an actual 350 MW (e) power-station boiler.

A Simple, Effective Viscosity Formulation for Turbulent Flow and Heat Transfer in Compact Heat Exchangers

“…Only the gross motion of the fluid was considered; detailed flow within the individual passages being modelled on a sub-scale of the computational grid. The approach was subsequently adopted by a number of researchers, (for example; Rhodes and Carlucci 1983;Theodossiou and Sousa 1988;Prithiviraj and Andrews 1998a,b;Coelho 1999a,b;Beale and Zhubrin 2005;Gómez et al 2007). The methodology is particularly a ppropriate for calculations involving large-scale industrial processes which include heat exchangers as sub-components.…”

Mineralogical investigations into clinker formation and variations in deposit characteristics with time in a large-scale pc-fired boiler

“…In an effort to understand the origin of clinker formation, systematic study into the elemental analysis and mineralogy of coals and clinkers is essential. Since there is no systematic mineralogical analysis pertinent to clinker formation in boilers in the open literature except for experimental and modelling based studies on ash deposition [6][7][8][9][10][11][12][13][14][15] and identification of clinker formation [16], an attempt has been to deduce the reasons behind clinker formation and changes in deposit characteristics with time in a 330 MW large scale power utility boiler located in Western Australia. Typically, previous studies of clinker formation have used an approach based upon chemistry.…”

Numerical Simulation of Waste Heat Boiler for Copper Flash Smelting

“…(1) (2) In the above equations: G -turbulent kinetic energy caused by the mean velocity gradient; G -turbulent kinetic energy caused by buoyancy; Y -compressible turbulent expansion influence on the total dissipation rate; μ -turbulent viscosity coefficient, μ ρc ; C , C , C , σ , σ are constants, valuing1.44,1.92,0.09,1.0,1.3.…”

“…The discharged flue gas rises with the copper synthetic furnace feeding increasing, which lead to the inlet and outlet high temperature of the convection zone. Finally, it will affect the safe operation of the waste heat boiler for flash smelting [2].…”