公开(公告)号：US20250100892A1

公开(公告)日：2025-03-27

申请号：US18728299

申请日：2023-01-31

Applicant: TOPSOE A/S

Inventor： Lari Bjerg KNUDSEN ,  Christian Henrik SPETH ,  Annette E. KRØLL JENSEN ,  Pat A. HAN

IPC: C01C1/04 ,  B01D3/14 ,  B01D53/00 ,  C25B1/042

Abstract: Ammonia synthesis process and plant comprising an ammonia synthesis converter and a downstream ammonia cooling system, wherein the ammonia synthesis converter is arranged to receive an ammonia synthesis gas comprising hydrogen and nitrogen and to produce an ammonia product gas stream and an off-gas ammonia stream; said ammonia cooling system comprising:—an ammonia evaporator for evaporating an ammonia liquid stream and generating an ammonia vapor stream;—an off-gas cleaning unit for cleaning said off-gas ammonia stream under the addition of water as a scrubbing agent, generating a water stream and an ammonia depleted off-gas stream;—an absorption cooling unit comprising water for cooling said ammonia vapor stream and collecting a condensed ammonia-water stream;—a regeneration unit for generating from said condensed ammonia-water stream: a purified water stream, said ammonia liquid stream, and an overhead ammonia gas stream.

公开(公告)号：US20240336489A1

公开(公告)日：2024-10-10

申请号：US18573888

申请日：2022-07-06

Applicant: Topsoe A/S

Inventor： Christian Henrik SPETH ,  Pat A. HAN ,  Lari Bjerg KNUDSEN

IPC: C01C1/04 ,  C25B1/04

CPC classification number: C01C1/047 ,  C25B1/04

Abstract: The invention relates to a method for operating an ammonia cooling circuit of an ammonia synthesis plant for preventing pressure variations in the cooling circuit due to varying load or outlet temperatures, wherein the method comprises: iii-1) adapting the liquid level of condensing ammonia inside the ammonia condensing unit of the cooling circuit according to the pressure of the compressed ammonia vapor stream, in which the ammonia condensing unit is a tube-shell heat exchanger; and/or iii-2) adapting the flow of cooling medium to the ammonia condensing unit according to the pressure of the compressed ammonia vapor stream of the cooling circuit; and/or iii-3) adapting the temperature of cooling medium directed to the ammonia condensing unit by recycling a portion of the cooling medium return stream. The invention relates also to an ammonia cooling circuit arranged for carrying out the method, its use for revamping an ammonia synthesis plant into a green ammonia synthesis plant, and an ammonia synthesis plant comprising the ammonia cooling circuit.