Heat exchanger for a loopseal of a circulating fluidized bed boiler and a circulating fluidized bed boiler

A circulating fluidized bed boiler, comprising:

• a furnace,
• a particle separator configured to separate bed material from flue gases receivable from the furnace, and
• a loopseal configured to receive the separated bed material from the particle separator, the loopseal comprising a 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, and
• a second feeding chamber configured to supply bed material to the second heat exchanger tubes,
• 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, and
• the first feeding chamber is configured to supply bed material to the second feeding chamber;
• wherein:
• the heat exchanger being arranged such that at least a part of the separated bed material is configured to run through the first feeding chamber,
• a first part of the separated bed material is configured to run from the first feeding chamber to the first heat exchanger tubes, and
• a second part of the separated bed material is configured to run from the first feeding chamber to the second feeding chamber and through the second feeding chamber to the second heat exchanger tubes;
• and
• wherein the heat exchanger further comprises:
• 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,
• primary first nozzles arranged at a lower vertical level than the first lower edge of the first wall and in the first feeding chamber, and configured fluidize bed material in the first feeding chamber, and
• primary second nozzles arranged at a lower vertical level than the first lower edge of the first wall and in the second feeding chamber, and configured fluidize bed material in the second feeding chamber,
• wherein 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;
• and
• wherein an amount of fluidizing air fed through the primary first nozzles is configured to be controlled independently of an amount of fluidizing air fed through the primary second nozzles.

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, and
• a second feeding chamber configured to supply bed material to the second heat exchanger tubes,
• 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,
• the first feeding chamber is configured to supply bed material only to the first heat exchanger tubes and to the second feeding chamber, and
• the second feeding chamber configured to supply bed material only to the second heat exchanger tubes.

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,
• a second wall that limits an inlet chamber and the first feeding chamber, and
• an inlet for receiving bed material, the inlet being arranged in the inlet 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,
• the second wall comprises a second lower edge that is arranged at a higher vertical level than a floor or floors of the inlet chamber and the first feeding chamber, and
• the inlet chamber is configured to supply bed material to the first feeding chamber from between the second lower edge of the second wall and floor(s) of the inlet chamber and the first feeding chamber.

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,
• a wall limiting a bypass chamber and an inlet chamber, the wall comprising a lower edge that is arranged at a higher vertical level than a floor or floors of the inlet chamber and the bypass 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,
• the inlet chamber is configured to supply bed material to the bypass chamber, and
• the bypass chamber is suitable for bypassing the heat exchanger tubes of the heat exchanger.

A circulating fluidized bed boiler, comprising:

• a furnace,
• a particle separator configured to separate bed material from flue gases receivable from the furnace, and
• a loopseal configured to receive the separated bed material from the particle separator, the loopseal comprising a 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, and
• a second feeding chamber configured to supply bed material to the second heat exchanger tubes,
• 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, and
• the first feeding chamber is configured to supply bed material to the second feeding chamber;
• wherein:
• the heat exchanger being arranged such that at least a part of the separated bed material is configured to run through the first feeding chamber,
• a first part of the separated bed material is configured to run from the first feeding chamber to the first heat exchanger tubes, and
• a second part of the separated bed material is configured to run from the first feeding chamber to the second feeding chamber and through the second feeding chamber to the second heat exchanger tubes, and
• where the heat exchanger further comprises:
• 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,
• secondary first nozzles arranged at a higher vertical level than the first lower edge of the first wall and in the first feeding chamber, and configured fluidize bed material in the first feeding chamber, and
• secondary second nozzles arranged at a higher vertical level than the first lower edge of the first wall and in the second feeding chamber, and configured fluidize bed material in the second feeding chamber,
• wherein 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;
• and
• wherein an amount of fluidizing air fed through the secondary first nozzles is configured to be controlled independently of an amount of fluidizing air fed through the secondary second nozzles.