US 12,404,783 B2
Method and system for operating a gas compressor in an ammonia and urea plant
Lino Giovanni Porro, Etterbeek (BE); Pieter Vidts, Gentbrugge (BE); and Nils D'Hoker, Gentbrugge (BE)
Assigned to YARA INTERNATIONAL ASA, Oslo (NO)
Appl. No. 17/926,334
Filed by Yara International ASA, Oslo (NO)
PCT Filed May 26, 2021, PCT No. PCT/EP2021/063975
§ 371(c)(1), (2) Date Nov. 18, 2022,
PCT Pub. No. WO2021/239775, PCT Pub. Date Dec. 2, 2021.
Claims priority of application No. 20176605 (EP), filed on May 26, 2020.
Prior Publication US 2023/0193908 A1, Jun. 22, 2023
Int. Cl. F01K 13/00 (2006.01); C01C 1/04 (2006.01); C07C 273/04 (2006.01); F04D 25/04 (2006.01); F04D 25/06 (2006.01)
CPC F01K 13/00 (2013.01) [C01C 1/0488 (2013.01); C07C 273/04 (2013.01); F04D 25/04 (2013.01); F04D 25/06 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for producing urea in a plant comprising an ammonia-producing unit and a urea-producing unit, the urea-producing unit including a gas compressor, a steam turbine fluidly connected to the ammonia-producing unit, the steam turbine connected to the gas compressor, and an electric motor connected to the gas compressor, the method comprising a steps of:
the steam turbine receiving steam produced by the ammonia-producing unit, wherein only the ammonia-producing unit supplies steam to the steam turbine of the urea-producing unit,
providing power from the steam turbine to the gas compressor during continuous operation of the urea-producing unit, which is a continuous phase in a production cycle wherein the urea-producing unit produces urea and operates at a given working load;
continuously providing the power from the electric motor to the gas compressor during the continuous operation of the urea-producing unit, while simultaneously providing the power from the steam turbine to the gas compressor.