Radiation Heat Transfer Modelling and CFD Analysis of Pulverised-Coal Combustion with Staged Air Introduction
Journal
Archives of thermodynamics
Date Issued
2009-10
Author(s)
Risto V. Filkoski
Abstract
Modelling of fossil fuel utility and industrial boilers has reached
a remarkable development in recent years. Particular attention in optimisation
of a utility boiler furnace operation, is given to the flame geometry
and position. Combustion chamber designers endeavour to achieve optimum
operating conditions that give maximum combustion efficiency, as well as
minimum pollutant formation rate. The application of computational fluid
dynamics (CFD) modelling technique and other advanced mathematical
methods offer opportunities for analysis, optimisation and options examination
in order to increase the overall efficiency of the energy facilities.
The main purpose of the present study was to investigate how the results
obtained with two radiative heat transfer methods, the P1 approximation
method and the discrete ordinates (DO) method, fit temperature field in
a boiler furnace on pulverised coal, with implemented over-fire air (OFA)
ports. The framework of the CFD modelling approach is described. The
numerical modelling results for boiler baseline operating conditions are compared
with a test matrix of local temperature measurements. An accuracy
analysis of the P1 and DO methods is done on a basis of a comparison
between the numerically obtained and measured temperature profiles.
a remarkable development in recent years. Particular attention in optimisation
of a utility boiler furnace operation, is given to the flame geometry
and position. Combustion chamber designers endeavour to achieve optimum
operating conditions that give maximum combustion efficiency, as well as
minimum pollutant formation rate. The application of computational fluid
dynamics (CFD) modelling technique and other advanced mathematical
methods offer opportunities for analysis, optimisation and options examination
in order to increase the overall efficiency of the energy facilities.
The main purpose of the present study was to investigate how the results
obtained with two radiative heat transfer methods, the P1 approximation
method and the discrete ordinates (DO) method, fit temperature field in
a boiler furnace on pulverised coal, with implemented over-fire air (OFA)
ports. The framework of the CFD modelling approach is described. The
numerical modelling results for boiler baseline operating conditions are compared
with a test matrix of local temperature measurements. An accuracy
analysis of the P1 and DO methods is done on a basis of a comparison
between the numerically obtained and measured temperature profiles.
Subjects