Experimental investigation into cavity-type inertial separators—a novel technique for development of subcompact circulating fluidized bed boilers

Abstract

SUMMARYCavity-type inertial separators developed by GRI (Patent no. 2, 159, 949, Canada, 2002) were tested in a semi-industrial size circulating fluidized bed pilot plant operated at room temperature. Three rows of separators were hung from the roof of the pilot plant where one row was kept inside the riser and the others were kept in the primary separation chamber, located between the back-pass and the riser. Parameters measured were axial pressure drops along the height of the riser, vertical solids flux on the separator walls, lateral outwards solids flux in the riser with and without separator and local temperatures on the separator walls. A net downwards solids flux is on the inner wall of the separators; however, no downwards solids flux is on the outer walls of the separators. Heat transfer coefficients on the outer wall are found higher than those on the inner walls of the separator. It is also found that the presence of inertial separators not only provides additional heat transfer surfaces but also indirectly increases the heat transfer coefficients on the riser wall.

Experimental investigation on gas‐liquid flow distribution in downward parallel pipes of a 660 MW ultrasupercritical CFB boiler

“…Due to good fuel flexibility, high combustion efficiency and effective pollution control, ultrasupercritical circulating fluidized bed (CFB) boilers have received worldwide attention. [1][2][3][4][5][6] The arrangement of the downflow evaporation heating surface in the CFB boiler furnace can effectively reduce the height of the furnace and the production costs. In the design of CFB boiler in Shanghai Boiler Factory, the evaporation heating surface arranged downward is used.…”

Study on fluidization of 0.5 µm ultrafine and 8.0 µm superfine Geldart-C powders in a binary mixture circulating fluidized bed

“…CFBs are applied for many energy systems. Typical CFBs processes are coal gasification and combustion, chemical‐looping combustion and hydrogen generation system, hot gas‐desulfurization, hydro‐cracking, rapid pyrolysis, sorption enhanced steam methane reforming, CFBs boilers and CFB downer reactions .…”

An experimental investigation of the effect of longitudinal fin orientation on heat transfer in membrane water wall tubes in a circulating fluidized bed

“…To fill this gap in research knowledge related to heat transfer in the CFB loop, a series of research on heat transfer to the wing walls [5,6], to the standpipes [7], to the cavity type inertial separators [8] and to the ceiling of the riser of a CFB boiler [9] was conducted. In this present work, a study of enhancement of heat absorption by the membrane water wall is conducted.…”