公开(公告)号：US20240198308A1

公开(公告)日：2024-06-20

申请号：US17917229

申请日：2021-04-01

Applicant: Yoshiki SHIGAKI

Inventor： Yoshiki SHIGAKI

IPC: B01J8/38 ,  B01J8/34 ,  B01J8/40

CPC classification number: B01J8/382 ,  B01J8/34 ,  B01J8/40

Abstract: Embodiments of the present disclosure relate to a powder bed including at least one pair of plates including a horizontally swinging perforated plate and a static perforated plate inside a packed bed or a moving bed that is aerated from below. In some embodiments, the swinging perforated plate may be configured to move horizontally relative to a horizontal plane so as to transmit a horizontal swinging motion to the powder. In some embodiments, the powder bed including the at least one pair of plates may improve uniform gas-solid contact in packed beds, moving beds, or multi-stage fluidized beds using highly cohesive, easily consolidated, or compacted powder. Further, in some embodiments, the powder bed may decrease consolidation and compaction of the powder in the powder bed.

公开(公告)号：US20230234013A1

公开(公告)日：2023-07-27

申请号：US18010800

申请日：2021-10-06

Applicant: Yoshiki SHIGAKI

Inventor： Yoshiki SHIGAKI

IPC: B01J8/26 ,  C07C9/04 ,  C01F5/24 ,  B01J8/38 ,  B01J23/46 ,  C01F5/14

CPC classification number: B01J8/26 ,  C07C9/04 ,  C01F5/24 ,  B01J8/388 ,  B01J23/46 ,  C01F5/14 ,  B01J2219/00058 ,  B01J2219/185

Abstract: PROBLEM TO BE SOLVED:
In an apparatus for synthesizing methane from carbon dioxide and hydrogen, a device which is capable to remove the reaction heat and lower the reaction temperature as the reaction progresses in order to increase the conversion ratio to methane has been desired.
SOLUTION:
In the present invention, powders of magnesium hydroxide and magnesium carbonate, which are chemical heat storage agents, are used as part of the fluidizing medium of the multi-stage fluidized bed in the temperature range where the methanation reaction proceeds. The heat generated during the methanation reaction can be absorbed and stored in the powder. At this time, carbon dioxide generated from magnesium carbonate can be used as a raw material gas for the methanation reaction. Furthermore, after discharging the magnesium oxide generated by endotherm, the powder can be regenerated with an external regenerating facility and then the storage heat can be released and recovered. The regenerated powder can be fed to the uppermost stage of the multi-stage fluidized bed at a temperature lower than the internal temperature of the reactor to lower inside temperature. This made it possible to lower the reaction temperature of ascending reaction gas in the reactor along with the reaction progress, and to increase the conversion ratio to the produced methane by this lowered temperature.