Optimisation of Ceramic Self-Recuperative Burners by Mathematical Modelling

摘要

A significant reduction of CO_2 emissions from high temeprature processes can be accomplished by means of heat recovery from the flue gases. For several years now, self-recuperative burners consisting of reaction-bonded silicon carbide have been avialiable onthe market for temperatures above 1100degC and for usage with corrosive flue gases, where chromium-nicle steels cannot be used. Ceramic self-recuperative burners for highe output and efficencies with the CFD-program FLUENT have been carried ot to determine the heat transfer processes. THis was done to reduce the development and optimisation expenditure. The results of the calcualtions with the stress analysis program COSMOS/M indicate that also complex self-recuperator geometries cause no problems in the flield of thermal stresses. Dur to the development of the production technical possibilities for RbSiC-components, it has been proven possible to produce ceramic self-recuperators which on the one hadn can be manufactured at a rational price level and, on the other, achieve a relative air prehaeting of up to dpsilon-0.8 With the new burner concepts the NOx emission could be lowered below the limit of the Clean Air code even at highest air preheat temperatures.