Method and apparatus for the production of urea from ammonia and carbon dioxide

摘要

Method for the production of urea from ammonia and carbon dioxide in a urea plant containing a high-pressure synthesis section with a horizontal pool condenser, wherein the method comprises exchanging heat from a high pressure process medium received in a shell section of the pool condenser to a medium pressure urea containing solution received in a first heat exchanging section provided in the pool condenser to at least decompose ammonium carbamate into NH3 and CO2, wherein the method further comprises exchanging heat from the high pressure process medium to a low pressure steam condensate received in a second heat exchanging section provided in the pool condenser to produce low pressure steam. The invention also relates to an apparatus for the production of urea from ammonia and carbon dioxide.

主权项

1. A method for the production of urea from ammonia and carbon dioxide in a urea plant containing a high-pressure synthesis section with a horizontal pool condenser comprising a shell section and first and second heat exchanging sections, wherein the method comprises
exchanging heat from a high pressure process medium in which carbamate is formed from NH3 and CO2 in an exothermic reaction, which high pressure process medium is received in the shell section of the horizontal pool condenser with a medium pressure urea-containing solution that comprises ammonium carbamate, that is received in said first heat exchanging section to at least decompose in said first heat exchanging section ammonium carbamate into NH3 and CO2, and exchanging heat from the high pressure process medium contained in said shell section with a low pressure steam condensate received in said second heat exchanging section to produce low pressure steam.