Circulating fluidized bed boiler with a loopseal heat exchanger

A circulating fluidized bed boiler, comprising

• a furnace,
• a cyclone for separating bed material from gases,
• a loopseal, and
• a loopseal heat exchanger arranged in the loopseal,
• the loopseal heat exchanger comprising:
• walls limiting an interior of the loopseal heat exchanger,
• a first particle outlet for letting out particulate material from the loopseal heat exchanger,
• an inlet for receiving bed material from the furnace via the cyclone,
• heat exchanger tubes arranged in the interior of the loopseal heat exchanger,
• a first ash removal channel configured to let out ash from the loopseal heat exchanger, and
• an ash cooler configured to receive ash from the first ash removal channel such that the ash is not conveyed via the furnace from the loopseal heat exchanger to the ash cooler,
• wherein:
• the first ash removal channel is arranged at a lower level than the first particle outlet,
• the walls limit a first compartment comprising the inlet for receiving bed material and a second compartment comprising the heat exchanger tubes,
• a first wall of the walls separates the first compartment from the second compartment and limits a first channel for conveying bed material from the first compartment to the second compartment, and
• the first ash removal channel is configured to let out ash from either the first compartment or the second compartment.