Numerical Calculations of WR-40 Boiler Based on its Zero-Dimensional Model

Abstract

Generally, the temperature of flue gases at the furnace outlet is not measured. Therefore, a special computation procedure is needed to determine it. This paper presents a method for coordination of the numerical model of a pulverised fuel boiler furnace chamber with the measuring data in a situation when CFD calculations are made in regard to the furnace only. This paper recommends the use of the classical 0-dimensional balance model of a boiler, based on the use of measuring data. by means of a selection of the furnace wall emissivity. As a result of CFD modelling, the flue gas temperature and the concentration of CO, CO 2 , O 2 and NO x were obtained at the furnace chamber outlet. The results of numerical modelling of boiler combustion based on volumetric reactions and using the Finite-Rate/Eddy-Dissipation Model are presented.

Numerical modelling of a stoker furnace operated under indirect co-firing of biomass

“…Stoker boiler modelling is a complex task (Hernik, 2014). Two approaches are common in modelling stoker-fired furnaces using CFD software:…”

“…For fuels with a very large content of volatile fractions, injection of additional air, referred to as secondary air, may prove necessary not only to mix flue gases but also to supply air to unburnt products of gasification. The screw feeder supplies fuel into the trough, whose rectangular edges are formed by the grate bars that air flows through (Hernik, 2014).…”

Numerical calculations of the WR-40 boiler with a furnace jet boiler system

“…Authors experience with previous calculation of this boiler [1] was also helpful in selecting appropriate competent sub-numerical models. The average temperature of flue gases at the furnace outlet toutlet was obtained using the classical 0-dimensional balance model of a boiler [4,5].…”