KETEP 세계에너지시장정보

Ammonia synthesis plant comprising an ammonia synthesis converter and a downstream ammonia cooling system (100), wherein said ammonia synthesis converter is arranged to receive an ammonia synthesis gas comprising hydrogen and nitrogen and to produce an ammonia product gas stream (105), wherein said ammonia synthesis plant is arranged to generate an off-gas ammonia stream (143), and wherein said ammonia cooling system (100) comprises: - an ammonia evaporator (116) for evaporating an ammonia liquid stream (101, 101', 101‴, 101iv) and generating an ammonia vapor stream (107), wherein the heat exchanging medium of the ammonia evaporator (116) is said ammonia product gas stream (105); - an off-gas cleaning unit (132) for cleaning said off-gas ammonia stream (143) under the addition of water as a scrubbing agent, generating a water stream (117) and an ammonia depleted off-gas stream (145); - an absorption cooling unit (118) comprising water for cooling said ammonia vapor stream (107) and collecting a condensed ammonia-water stream (119); - a regeneration unit (126) for generating from said condensed ammonia-water stream (119, 121): a purified water stream (125, 125', 125"), said ammonia liquid stream (101, 101', 101"', 101iv), and an overhead ammonia gas stream (139); and wherein: - said ammonia evaporator (116) is arranged to receive said ammonia liquid stream (101, 101', 101‴, 101iv) and said heat exchanging medium (105) for evaporating said ammonia liquid stream (101, 101', 101‴, 101iv), thereby generating said ammonia vapor stream (107); - said off-gas cleaning unit (132), suitably an off-gas scrubbing unit, is arranged to receive: said purified water stream (125, 125', 125") from said regeneration unit as the scrubbing agent and said off-gas ammonia stream (143), thereby generating said ammonia depleted off-gas stream (145) and said water stream (117); - said absorption cooling unit (118), suitably a mixing vessel (118") containing water, is arranged to receive said water stream (117) and said ammonia vapor stream (107), for thereby generating and collecting said condensed ammonia-water stream (119); said absorption cooling unit further comprising a cooling device (118') such as a coil arranged to receive a cooling medium (139) such as water, and an outlet for withdrawing said condensed ammonia-water stream (119); - said regeneration unit (126) is a distillation column arranged to receive said condensed ammonia-water stream (119, 121), and said regeneration unit (126) comprising: an outlet for withdrawing as a bottom stream said purified water stream (125), an outlet for withdrawing an overhead ammonia stream (123) and a separation unit (112) for separating from said overhead ammonia stream (123) said overhead ammonia gas stream (139) and said ammonia liquid stream (101).