Experimental determination of temperatures of the inner wall of a boiler combustion chamber for the purpose of verification of a CFD model

Abstract

TRÁVNÍČEK, P., KUKLA, R, VÍTĚZ, T., MAREČEK, J.: Experimental determination of temperatures of the inner wall of a boiler combustion chamber for the purpose of verifi cation of a CFD model. Acta univ. agric. et silvic. Mendel. Brun., 2011, LIX, No. 1, pp. 235-242 The paper focuses on the non-destructive method of determination of temperatures in the boiler combustion chamber. This method proves to be signifi cant mainly as regards CFD (Computational Fluid Dynamics) simulations of combustion processes, in case of which it is subsequently advisable to verify the data calculated using CFD so ware application with the actually measured data. Verification of the method was based on usage of reference combustion equipment (130 kW) which performs combustion of a mixture of waste sawdust and shavings originating in the course of production of wooden furniture. Measuring of temperatures inside the combustion chamber is -considering mainly the high temperature values -highly demanding and requires a special type of temperature sensors. Furthermore, as regards standard operation, it is not possible to install such sensors without performing structural alterations of the boiler. Therefore, for the purpose of determination of these temperatures a special experimental device was constructed while exploiting a thermal imaging system used for monitoring of the surface temperature of outer wall of the reference boiler. Temperatures on the wall of the boiler combustion chamber were determined on the basis of data measured using the experimental device as well as data from the thermal imaging system. These values might serve for verifi cation of the respective CFD model of combustion equipment. temperature on the inner wall of a combustion chamber, combustion equipment, thermal imaging measurement, CFD model of the combustion process, heat transmission coeffi cient

Calculation of cooling curve of the combustion boiler refractories lining with use of an experimental device

“…The following stage of measurement was supposed to comprise heating of a layer of material using a gas burner in order to determine cooling dynamics from temperature 700 °C. This temperature is commonly achieved in cobustion boiler for combusting of biomass (Trávníček et al, 2011;Lavric et al, 2004;Novozhilov et al, 1996). However, due to safety reasons the experiment was terminated (the propane-butane cylinder was overheated).…”

“…Aborting of experiment 2: External modules for data collection 3: Graphical user interface for experimental measurment and data collection was executed in temperature of 400 °C. However it was proved that progress of this curve is acorrding to scientifi c work (Trávníček et al, 2011).…”

“…For this purpose experimental device, which proved success in experimental determination of temperatures of the inner wall of the combustion chamber of the boiler for the purpose of verifi cation of a CFD model have been used. This experimental device has been designed at the Department of Agricultural, Food and Evironmental Engineering at Mendel University in Brno (Trávníček et al, 2011). For the purpose of testing of new method, the materials, which are commonly used as refractory lining in the combustion chamber of reference boiler with heat output of 130 kW, have been used.…”