Zgurskyy V. DEVELOPMENT OF THE CALCULATION METHOD OF RADIATIVE HEAT EXCHANGE IN LOW EMISSION FURNACE

The technique of calculation of radiative heat exchange within the furnaces (combustion chambers) has been developed grounded upon Monte-Carlo procedures. The model is multipurpose means and allows ensuring the accurate computations taking into account of complex geometry of the furnace and of low-emission processes of the natural gas combustion. Account of selectivity of radiation of combustion products by means of weighted sum of grey gases model - WSGG (H. Hottel) - has been used accordingly the procedure. Using of homogeneous coordinates and of geometrical transformations by means of uniform matrix forms has been proposed for the first time to perform Monte-Carlo procedures. The reduced methane combustion mechanism developed by prof. B. Soroka has been used in frame of complex mathematical model. The analysis of the ways of increase of the furnaces productivity at DUNAFERR metallurgical works (Hungary) has been carried out. The opportunity of 15% productivity enhancement of the furnaces output hasbeen proved. Calculation of boiler furnace equipped with the Forced Internal Recirculation Burners (FIRB) for the hot water boiler "HOST Boiler", USA, has been carried out. The optimum geometry of the combustion chamber with the burner of mentioned type has been recommended along with the value of primary air excess factor 0.75... 0.8 which provides the minimum NOх yield. The computation of radiative heat fluxes pattern by absorbing surfaces for boilers of DKVR (6.5/13 and 10/13), GM-5, BKZ-75 have been performed in framework of fundamental problem statement. The analysis of recirculation influence has been carried out regarding both fuel using efficiency as well as reduction of NOx emission for the boiler TVG-8 type. It has been proved that Monte-Carlo technique represents the actual means of calculation both integral (or averaged for the furnace) and the local thermal conditions of the boiler furnace and of its separate assemblies.