Thermal modeling of absorbed heat flux meters in the furnace walls of a coal fired utility boiler

Abstract:

The heat flux absorbed in furnace walls is a vital parameter in pulverized-coal-fired utility boilers with slagging problems on the flame side. In order to clarify concepts about this variable and its measurement, an analysis of heat transfer in the tube material was performed by the finite element method. Two models were developed: a two-dimensional model of the unaltered tube, and a three-dimensional model of a tube section with standard sheathed thermocouples. The ANSYS code (Kohnke, 1987) was used as a working tool. The geometry and boundary conditions were chosen on the basis of theoretical correlations and data from a real boiler. The results of analysis reveal the significance of measurements of the absorbed heat flux with regard to the geometry and thickness of the deposits. Likewise, different measuring methods using thermocouples were studied, and a theoretical calibration for one sensor geometry was established.

Año de publicación:

1990

Keywords:

Fuente:

scopus