US 11,835,298 B2
Heat exchanger for a loopseal of a circulating fluidized bed boiler and a circulating fluidized bed boiler
Pekka Lehtonen, Tampere (FI)
Assigned to VALMET TECHNOLOGIES OY, Espoo (FI)
Filed by Valmet Technologies Oy, Espoo (FI)
Filed on Mar. 25, 2022, as Appl. No. 17/704,632.
Claims priority of application No. 20215411 (FI), filed on Apr. 7, 2021.
Prior Publication US 2022/0325961 A1, Oct. 13, 2022
Int. Cl. F28D 13/00 (2006.01); F22B 31/00 (2006.01); F23C 10/10 (2006.01); F28F 9/22 (2006.01)
CPC F28D 13/00 (2013.01) [F22B 31/0084 (2013.01); F23C 10/10 (2013.01); F28F 9/22 (2013.01); F23C 2206/103 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A heat exchanger suitable for recovering heat from bed material of a fluidized bed boiler, the heat exchanger comprising:
first heat exchanger tubes,
second heat exchanger tubes,
a first feeding chamber configured to supply bed material to the first heat exchanger tubes,
a second feeding chamber configured to supply bed material to the second heat exchanger tubes, and
a first wall that limits the first feeding chamber and the second feeding chamber, the first wall comprising a first lower edge that is arranged at a higher vertical level than a floor or floors of the first feeding chamber and the second feeding chamber,
wherein:
the first heat exchanger tubes are arranged only on a first side of a plane and the second heat exchanger tubes are arranged only on a second side of the plane,
the first feeding chamber is configured to supply bed material to the second feeding chamber, and
the first feeding chamber is configured to supply bed material to the second feeding chamber from between the first lower edge of the first wall and floor(s) of the first and second feeding chambers.