Method of concurrently modernising an ammonia production plant and an urea production plant, method of and plant for concurrently producing ammonia and urea

摘要

A method for the simultaneous modernisation of a plant for ammonia synthesis and a plant for urea synthesis, provides - inter alia - the arrangement of a carbamate synthesis section and a carbamate decomposition section, in order to obtain a predetermined amount of carbamate in aqueous solution and of hydrogen and nitrogen in gaseous phase which are fed to the existing sections for urea synthesis, respectively ammonia synthesis. Thanks to this method of modernisation it is possible to remarkably increase the production capacity and at the same time to reduce the energy consumption of the urea and ammonia plants without being forced to replace or anyway overload the existing sections of decarbonation, methanation and compression, in general. IMAGE