Solid filling tank

A solid filling tank comprising:

• a tank main body configured to be filled with solid particles capable of absorbing or adsorbing a predetermined gas;
• and
• a heat exchanger disposed within the tank main body,
• wherein the heat exchanger comprises:
• a circulation tube configured to circulate a medium to exchange heat with the solid particles;
• and
• a plurality of heat transferring fins each attached to the circulation tube, the heat-transferring fins comprise a first heat-transferring fin formed in corrugated plate shape and a second heat-transferring fin formed in flat plate shape, which are arranged alternatively in parallel to each other, and the heat-transferring fins further comprise a through hole configured to permit the solid particles to pass therethrough,
• wherein the heat-transferring fins comprise a restricting portion configured to restrict movement of the solid particles in a subsiding direction of the solid particles and the restricting portion comprises a plurality of partitioned portions formed in between each of the opposing pair of the first heat-transferring fin and the second heat-transferring fin, and the plurality of partitioned portions are configured to be communicated with each other via the through hole.