Clean and ecological coal combustion in the binary circulating fluidized bed

The aim of this paper is to increase the understanding of the role of the b inary circulating fluidized bed in the process of clean and ecological coal combustion. The operating range of a stable fluidized bed, as a function o f gas velocity changes and the flow rate of fine particles, is determined f or all possible conditions. Experiments concerning the combustion and desul furization processes in multi-solid fluidized bed (MSFB) and circulating fl uidized bed (CFB) systems give evidence that the residence time of burnt pa rticles in the combustion chamber of MSFB is much extended. This is directl y reflected in better combustion conditions, especially those for fine part icles, as well as in the process of desulfurization. The advantages of the binary circulating fluidized bed over typical circulating systems make it o ne of the most efficient methods of clean and ecological coal combustion. ( C) 2001 Elsevier Science Ltd. All rights reserved.