Heat Exchanger Element and Use Thereof

A fluidized bed, comprising:

• a heat exchanger comprising:
• a fluidized bed wall,
• at least one heat exchanger element (1) with a horizontal inlet (2), a horizontal outlet (3), multiple vertical heat exchanger tubes (4), a lower horizontal collector (5), and an upper horizontal distributor (6), wherein
• each of the vertical heat exchanger tubes (4) extends from a respective upper end (8) to a respective lower end (9) with the respective lower ends of the vertical heat exchanger tubes (4) connected to the lower collector (5) and the respective upper ends of the heat exchanger tubes (4) connected to the upper distributor (6),
• the lower collector (5) is connected to the outlet (3),
• the upper distributor (6) is connected to the inlet (2), further comprising
• a vertical riser pipe (7) arranged between the inlet (2) and the upper distributor (6) and connecting the inlet (2) and upper distributor (6) to one another, wherein
• the riser pipe (7) is configured such that the inlet (2) is positioned closer to the outlet (3) than to the upper distributor (6),
• the inlet (2) and the outlet (3) are guided through the fluidized bed wall, and
• the riser pipe (7), the upper distributor (6), the lower collector (5) and the vertical heat exchanger tubes (4) are arranged within the fluidized bed wall.