Heat exchange single pipe, horizontal flow direction membrane type wall hearth and circulating fluidized bed furnace

The invention discloses a heat exchange single tube, a horizontal flow direction membrane wall hearth and a circulating fluidized bed furnace. The problem that a circulating fluidized bed structure cannot be used due to abrasion of a heat carrier heating furnace is completely solved; the volume pipe distribution rate of the hearth is increased, the height of the circulating fluidized bed is reduced, manufacturing is convenient, and the membrane wall hearth is supported by the outer wall membrane wall; the multi-purpose boiler can be used as a steam boiler as well as a heat carrier furnace or a gas heating furnace in one boiler, and the heat exchange area of each user is flexibly arranged in one boiler according to the characteristics of each heat user; by increasing the arrangement area of the hearth and reducing the temperature of a hearth smoke outlet, the problem that the heat exchange surface of the rear flue of the circulating fluidized bed furnace is frequently blocked due to wall adhesion is solved; th