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Analysis of the bottom part of a large technical scale circulating fluidized bed boiler

Sekret W., Nowak W.

Archives of Thermodynamics

2006

Vol. 27, no. 1

31-52

An analysis of bed material particle behavior in the bottom part of the combustion chamber of a circulating fluidized bed (CFB) boiler in a large technical scale was undertaken in the study. The tests were carried out on two 670 MW boilers. These boilers differed in the construction of the primary air nozzles. The obtained results have shown the presence of a turbulent bubbling bed in the bottom region of the CFB boiler structure in a large technical scale. It has also been obseryed that in the case of large technical scale CFB boilers a considerable vertical and horizontal pressure gradients occur in the primary air grid region. These lead, on the one hand, to blowing of the bed material into the nozzle discharge channels and possibly a backflow to the windbox and, on the other hand, to a non-uniform fluidization of the bottom region. The tests have also demonstrated a strong effect of the primary air nozzle design on the NO[x] concentration in the combustion gas.

Segregacja ziaren paliwa w cyrkulacyjnej warstwie fluidalnej

Sekret W., Nowak W.

Inżynieria Chemiczna i Procesowa

2002

T. 23, z. 2

229-244

Dokonano analizy segregacji ziaren paliwa w cyrkulacyjnej warstwie fluidalnej. Przedstawiono model matematyczny stopnia segregacji ziaren paliwa; do weryfikacji eksperymentalnej wykorzystano laserowy nóż świetlny. Stwierdzono, że wzrost prędkości gazu i gęstości strumienia masy cyrkulujących ziaren inertu powoduje intensyfikację mieszania ziaren paliwa oraz zmniejszenie stopnia ich segregacji.

There is made the analysis of the phenomenon of the fuel segregation in a circulating fluidized bed (CFB). A mathematical model of the degree of segregation of fuel particles is presented. Experimental data used to verify the model have been obtained with the aid of the laser knife technique. It has been found that higher superficial gas velocities and mass flux of circulating inert particles lead to more intensive mixing and diminishing the segregation of the fuel particles.