Green ammonia absorption cooling

The ammonia synthesis plant of claim 1, wherein in said ammonia cooling system, said regeneration unit comprises an upper section (I) and a lower section (II);

• said lower section (II) comprising:
• a power-driven heating device and/or a reboiling unit arranged to receive a heat exchanging medium;
• and
• an outlet for withdrawing as bottom stream said purified water stream;
• said upper section (I) comprising:
• an inlet for receiving the condensed ammonia-water stream;
• and
• an overhead section comprising:
• an outlet for withdrawing said overhead ammonia stream;
• an ammonia condensing unit arranged to receive said overhead ammonia stream and a cooling medium, for generating a condensed overhead ammonia stream;
• separation unit arranged to receive said condensed overhead ammonia stream, said separation unit comprising an outlet for withdrawing an ammonia liquid fraction, and an outlet for withdrawing said overhead ammonia gas stream;
• a reflux pump arranged to receive said ammonia liquid fraction and direct a portion thereof as overhead reflux stream to said overhead section;
• the overhead section being configured for withdrawing the remaining portion of said ammonia liquid fraction as said ammonia liquid stream. 7. The ammonia synthesis plant of claim 6, further comprising upstream said ammonia cooling system one or more steam boilers arranged to receive said ammonia product gas stream, for recovering heat therefrom and producing steam, and wherein the plant is further arranged for providing at least a portion of said steam as the heat exchanging medium to said reboiling unit.

Process for producing an ammonia product gas from an ammonia synthesis gas stream comprising hydrogen and nitrogen, said process also producing an off-gas ammonia stream, the process comprising the steps:

• a) converting the ammonia synthesis gas into said ammonia product gas in an ammonia synthesis converter;
• the process further comprising the cooling of the ammonia product gas according to the steps:
• b) evaporating an ammonia liquid stream in an ammonia evaporator for generating an ammonia vapor stream under the provision of said ammonia product gas as heat exchanging medium;
• c) supplying said off-gas ammonia stream to an off-gas cleaning unit under the addition of a purified water stream as scrubbing agent for generating a water stream and an ammonia depleted off-gas stream;
• d) withdrawing from said off-gas cleaning unit said water stream and supplying it, together with said ammonia vapor stream, to an absorption cooling unit under the provision of a cooling medium, for generating and collecting a condensed ammonia-water stream;
• e) withdrawing said condensed ammonia-water stream from said absorption cooling unit and supplying it to a regeneration unit, for generating:
• said ammonia liquid stream, an overhead ammonia gas stream and a purified water stream.