| Popis: |
A steady-state heat flow model has been developed and experimentally verified for multicomponent refractory walls likely to be used in coal gasification and other process vessels. Gas-filled pores, multiple solid phases, cracks, voids, and anchors are specified on a statistical basis to produce a generalized effective conductivity model, which is named CONBEC. Shape and orientation effects are determined by a shape factor which can vary continuously between the limiting cases of series and parallel heat. The refractory lining is described as a series of blocks which allows for distinct material changes, gaps, conductivity changes with temperature and hot spot determination. The output of the model provides heat flux and temperature profiles. The simplicity of the model and its flexibility makes it useful to predict the effects of pores, cracks, voids, gaps, anchor size and spacing, gas composition, temperature, and gas pressure for different material combinations. Experimental verification of the model generally confirmed its accuracy and demonstrated its versatility. |
