METHOD OF FORMING UREA BY INTEGRATION OF AN AMMONIA PRODUCTION PROCESS IN A UREA PRODUCTION PROCESS AND A SYSTEM THEREFOR

摘要

A method of forming urea by integration of an ammonia production process with that of a urea production process, as well as a system for the method is disclosed. Also, an alternative method of forming urea by integration of a part of an ammonia production process with that of a urea production process, as well as a system for the alternative method.

主权项

1. A method of forming urea by integration of an ammonia production process in a urea production process comprising:
obtaining ammonia and carbon dioxide and a flue gas for a first ammonia stream, a carbon dioxide stream, and a flue gas stream containing carbon dioxide, separating the first ammonia stream into a second ammonia stream and a third ammonia stream, wherein the second ammonia stream is transported to an absorber and the third ammonia stream is transported to a urea synthesis section of a urea production process for the production of urea; transporting the carbon dioxide stream to the urea synthesis section; transporting the flue gas stream to the absorber; combining the second ammonia stream and a lean solvent stream provided from the urea production process to form a mixed stream; contacting the mixed stream with the flue gas stream in the absorber to absorb carbon dioxide from the flue gas stream to form a rich solvent stream and a treated gas stream; transporting the rich solvent stream emitted from the absorber to the urea synthesis section; contacting the carbon dioxide stream, the third ammonia stream and the rich solvent stream in the urea synthesis section to form urea and the lean solvent stream, and transporting the lean solvent stream from the urea production process to the absorber.