FIELD: methods and plants for combined production of ammonia and carbamide. SUBSTANCE: method realization is based on process flow diagram with use of reactor of ammonia synthesis, section of carbamate synthesis, reactor of carbamide synthesis, and section of carbamide recovery. A part of flow containing carbamate in aqueous solution and coming from section of carbamide recovery is subjected to treatment with partial decomposition of carbamate for obtaining flow including ammonia and carbon dioxide in vapor phase, and flow including diluted carbamate in aqueous solution. Produced diluted carbamate together with gas floe including hydrogen, nitrogen and carbon dioxide, preferably, produced at a stage of hydrocarbon reforming, is combined with ammonia flow coming from reactor of ammonia synthesis. Mixture is directed to section of carbamate synthesis, where formed from ammonia and carbon dioxide is flow including carbamate in aqueous solution and gas flow including hydrogen and nitrogen. Flow including carbamate in aqueous solution is directed to reactor of carbamide synthesis, and gas flow including hydrogen and nitrogen is directed to reactor of ammonia synthesis. Plant for embodiment of the method is based on combination in a single process cycle of reactors of ammonia synthesis connected with reforming section, with reactors of carbamate synthesis and carbamide synthesis, and also with sections of carbamide recovery and concentration. Modernization of single plants of ammonia and carbamide synthesis is based on formation of process cycle described above. EFFECT: reduced capital investments, power and material expenditures. 23 cl, 1 dwg
