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A combination rotatable fluidized bed heat exchanger (54) and rotatable fluidized bed combustor (26), said heat exchanger (54) comprising: a. a first elongated perforated wall (108); b. a second perforated wall (110) spaced apart and substantially co-extensive with said first perforated wall (108);

A combination rotatable fluidized bed heat exchanger (54) and rotatable fluidized bed combustor (26), said heat exchanger (54) comprising: a. a first elongated perforated wall (108); b. a second perforated wall (110) spaced apart and substantially co-extensive with said first perforated wall (108); c. enclosing walls (109) defining with said first and second perforated walls (108, 110) a first fluidization chamber (112); d. a first bed of pulverulent solid particles (114) in said first chamber (112); e. means (111) for rotating said first chamber (112) about an axis (18) to cause the first particles (114) to centrifugally gravitate toward said first perforated wall (108); f. means (102) for feeding a relatively hot first fluid into said first chamber (112) through said first perforated wall (108) and out of said first chamber (112) through said second perforated wall (110), said first fluid heating said first particles (114) in said first chamber (112); g. means (102) for feeding a gaseous agent into said first chamber (112) through said first perforated wall (108) and out of said first chamber (112) through said second perforated wall (110), said gaseous agent having flow characteristics suitable for fluidizing said first particles (114) in said first chamber (112); h. at least one tube (120) in said first chamber (112) extending substantially co-extensively with said walls (108, 110) for passing a relatively cool second fluid therethrough, whereby said second fluid is heated by the heat bed particles and said relatively hot first fluid is cooled; and i. means (134) for directing said heated second fluid to said rotatable fluidized bed combustor (26) for exothermically reacting said heated second fluid and a fuel; said combustor (26) comprising: j. a third elongated perforated wall (208); k. A fourth perforated wall (210) spaced apart and substantially co-extensive with said third perforated wall (208); l. enclosing walls (209) defining with said third and fourth perforated walls (208, 210) a second fluidization chamber (212); m. a second bed of pulverulent solid particles (214) in said second chamber (212); n. means (14) for rotating said second chamber (212) about an axis (18) to cause the second particles (214) to centrifugally gravitate toward said third perforated wall (208); o. means (202) for feeding said heated second fluid into said second chamber (212) through said third perforated wall (208) and out of said second chamber (212) through said fourth perforated wall (210), said heated second fluid having flow characteristics suitable for fluidizing said second particles (214) in said second chamber (212); p. means (204, 202) for introducing a combustible fuel through said third perforated wall (208) into said second chamber (212), said fuel reacting with at least a portion of said heated second fluid in said second chamber (212) to form gaseous combustion products; q. means (216) for receiving said gaseous combustion products and unreacted heated second fluid exiting from said second chamber (212) through said fourth perforated wall (210); and r. means (218) for directing said unreacted heated second fluid and said gaseous combustion products exiting said fourth perforated wall (210) away from said second chamber (212).