CFD and infrared combined analysis of a furnace belonging to a 420 t/h bituminous coal steam generator

Abstract

Paper presented at the 9th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Malta, 16-18 July, 2012.

Some years ago an old lignite fired power plant provided with two steam generators of 420 t/h, has been revamped in the northern part of Romania. This operation was focused mainly upon the changing of the initial type of fuel – Romanian lignite – into bituminous coal, including new type of burners also. At the same time, some geometrical modifications have been added to the furnace due to the new burners’ particularities. After two years of operation, a lot of functional problems have been recorded especially regarding the high flue gas temperature at the end of the furnace (sometimes greater that the melting point of the ash) due to a lower intensity of the heat transfer process; at the same time a great difference between the flue gas temperature occurs on the left part of the furnace in comparison with the right part. This paper presents a PhD task focused upon the heat transfer phenomena analysis inside the above mentioned furnace