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US 11,376,542 B2Granted
Apparatus and method for treatment of process vapours coming from a vacuum concentration section of a urea plant
AssigneeSaipem S.P.A.
InventorsCristina Cerrone, Jacopo Cedrati
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Abstract
An apparatus for treatment of process vapours coming from a vacuum concentration section of a urea plant, comprising a vacuum system having a plurality of successive condensation stages, connected in series by respective line portions and crossed in series by process vapours to be treated; the apparatus has at least one primary steam condensate inlet for feeding steam condensate to the vacuum system and positioned, with reference to a circulation direction of the process vapours in the vacuum system, upstream of at least one selected condensation stage, or in at least one selected condensation stage.
Claims24
An apparatus comprising:
- a vacuum system having a plurality of successive condensation stages to treat, in series, process vapours, the plurality of successive condensation stages connected, in series, by a plurality of successive line portions;
- at least one primary steam condensate inlet that feeds steam condensate to the vacuum system, wherein the at least one primary steam condensate inlet defines a main injection point of steam condensate in the vacuum system where at least 50%, by weight, of all steam condensate is injected to the vacuum system and the at least one primary steam condensate inlet is arranged at at least one of:
- upstream, relative to a circulation direction of the process vapours through the vacuum system, of a selected one of the condensation stages, and in the selected one of the condensation stages;
- and
- a washing unit connected to a last one of the condensation stages by a last line portion of the plurality of successive line portions, the washing unit having:
- an inlet connected to a supply line fed with steam condensate,
- a condensate outlet connected to a condensate line from which steam condensate is used for washing is collectable, and
- a gas outlet connected to a discharge line from which incondensable purge gases are collectable.
5 more elements
A method for treating process vapours coming from a vacuum concentration section of a urea plant, the method comprising:
- condensing the process vapours in a plurality of successive condensation stages, connected in series, of a vacuum system to create vacuum conditions in the vacuum concentration section positioned upstream of the condensation stages, wherein the vacuum system comprises the condensation stages and a washing unit connected to a last one of the condensation stages;
- supplying steam condensate at at least one main injection point where at least 50%, by weight, of all steam condensate is fed to the vacuum system, the at least one main injection point being positioned at at least one of:
- upstream, relative to a circulation direction of the process vapours through the vacuum system, of at least one selected condensation stage and inside the at least one selected condensation stage;
- and
- washing, in the washing unit, incondensable purge gas exiting from the last one of the condensation stages with steam condensate to reduce an amount of NH3.
2 more elements
A system comprising:
- a vacuum concentration section, and
- an apparatus to treat process vapours coming from the vacuum concentration section, the apparatus comprising:
- a vacuum system having a plurality of successive condensation stages to treat, in series, the process vapours, the plurality of successive condensation stages connected in series by a plurality of successive line portions;
- at least one primary steam condensate inlet that feeds steam condensate to the vacuum system, wherein the at least one primary steam condensate inlet defines a main injection point of steam condensate in the vacuum system where at least 50%, by weight, of all steam condensate is injected to the vacuum system and the at least one primary steam condensate inlet is arranged at at least one of:
- upstream, relative to a circulation direction of the process vapours through the vacuum system, of a selected one of the condensation stages, and in the selected one of the condensation stages;
- and
- a washing unit connected to a last one of the condensation stages by a last line portion of the plurality of successive line portions, the washing unit having:
- an inlet connected to a supply line fed with steam condensate,
- a condensate outlet connected to a condensate line from which steam condensate is used for washing is collectable, and
- a gas outlet connected to a discharge line from which incondensable purge gases are collectable.
7 more elements
Dependencies are inferred from the claim text.