Patent ID: 9463983
Filing Date: 2016-10-11
CPC Classification: C01B,C01C,Y02E,Y02P

Claim Text:
1. A method for regulation of an ammonia plant, said ammonia plant comprising a high-pressure ammonia synthesis loop comprising at least an ammonia reactor, where a make-up gas comprising a hydrogen feed and a nitrogen feed is converted into ammonia at a synthesis pressure; said loop also comprising a purge line arranged to draw a flow of a purge gas containing inerts from said loop, the method comprising the steps of: during operation of the ammonia plant at a partial load, operating the ammonia synthesis loop at said synthesis pressure, and reducing said purge flow to obtain a concentration of inerts in the ammonia synthesis loop which is greater than a concentration of inerts in the loop at nominal load; wherein the ammonia plant is operated at nominal load and at partial load, alternately; and wherein during operation of the ammonia plant at a partial load, the ratio between the molar flow rate of said purge gas and the molar flow rate of make-up gas is reduced to a value which is smaller than a nominal value of said ratio used when the ammonia plant operates at a nominal load.