The impact of bed particle size in heat transfer to membrane walls of supercritical CFB boiler

• Autorzy: Błaszczuk A. , Nowak W. , Jagodzik S.
• Języki publikacji: EN

Abstrakty

EN

Experimental research has been carried out in a supercritical circulating fluidized bed combustor in order to indicate the effect of the bed particle size on bed-to-wall heat transfer coefficient. The bed inventory used were 0.219, 0.246 and 0.411 mm Sauter mean particles diameter. The operating parameters of a circulating fluidized bed combustor covered a range from 3.13 to 5.11 m/s for superficial gas velocity, 23.7 to 26.2 kg/(m₂s) for the circulation rate of solids, 0.33 for the secondary air fraction and 7500 to 8440 Pa pressure drop. Furthermore, the bed temperature, suspension density and the main parameters of cluster renewal approach were treated as experimental variables along the furnace height. The cluster renewal approach was used in order to predict the bed-to-wall heat transfer coefficient. A simple semi-empirical method was proposed to estimate the overall heat transfer coefficient inside the furnace as a function of particle size and suspension density. The computationally obtained results were compared with the experimental data of this work.

Słowa kluczowe

EN

heat transfer coefficient; cluster renewal approach; bed particle size; suspension density; circulating fluidized bed

PL

współczynnik wnikania ciepła; wielkość cząstek; gęstość zawiesiny; cyrkulacyjna warstwa fluidalna

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN ; Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archives of Thermodynamics
• Rocznik: 2014
• Tom: Vol. 35, no. 3
• Strony: 207--223
• Opis fizyczny: Bibliogr. 29 poz., il.

Twórcy

autor

Błaszczuk A.

• Czestochowa University of Technology, Institute of Advanced Energy Technologies, Dąbrowskiego 73, 42-200 Częstochowa, Poland

autor

Nowak W.

• Czestochowa University of Technology, Institute of Advanced Energy Technologies, Dąbrowskiego 73, 42-200 Częstochowa, Poland

autor

Jagodzik S.

• Tauron Generation S.A., Lagisza Power Plant, Pokoju 14, 42-250 Będzin, Poland

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