CONTROL OF AMMONIA SYNTHESIS CIRCUIT AT PARTIAL LOAD Russian patent published in 2025 - IPC C01C1/04 B01J19/00 G05D27/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a method for synthesis of ammonia, in which: in head section (1) make-up synthesis gas (2) for producing ammonia; increasing pressure of said make-up synthesis gas in first compressor (3); feeding high-pressure synthesis gas (4) obtained in the first compressor to ammonia synthesis circuit (5), including at least: converter (7), in which catalytic synthesis of ammonia is performed; circulating means (6), which is a compressor configured to circulate in the circuit and feed into the converter a source gas comprising a make-up synthesis gas; converter feed line (10) from the circulating medium to the converter; condensation section (8) arranged at the outlet of the synthesis section for receiving an ammonia-containing gas product; separation section (9), in which the condensate obtained in the condensation section is separated into an ammonia liquid product and a gas recirculated stream; recirculation line (14) from separation section to suction inlet of circulation means. Full load mode of ammonia synthesis circuit (5) corresponds to treatment of nominal flow rate of make-up synthesis gas (2) transmitted from head section (1) to synthesis circuit. Method comprises controlling circuit (5) in partial load mode, in which flow rate of make-up synthesis gas transmitted to the circuit from the head section, below the nominal flow rate, by reducing the ammonia synthesis pressure to a reduced ammonia synthesis pressure, which is below the nominal synthesis pressure in the converter full load mode; maintaining synthesis pressure within the target range including reduced synthesis pressure by controlling the flow rate of the initial gas in the bypass flow directed around the converter. Invention also relates to a method of controlling an ammonia synthesis loop and a synthesis loop for synthesis of ammonia from make-up synthesis gas for producing ammonia.

EFFECT: creation of an ammonia synthesis circuit and a corresponding control method, adapted for operation in a wide range of operating loads and for monitoring fast changes in load, with a small buffer gas margin or without using a buffer gas.

16 cl, 2 ex, 1 dwg