Process for steam heat recovery from multiple heat streams
AssigneeUop LLC
InventorsMark VanWees, Jason L. Stahlman
Life of this patent
Estimating the term…
Abstract
Disclosed is an apparatus and process for recovering heat from multiple hot process streams without multiplying instrumentation. Each hot process stream is indirectly heat exchanged with a water circuit which leaves and feeds a steam drum. Heat is added to the steam drum through the addition of water heated outside of the steam drum. The heated liquid and vapor water is heated in heat exchangers decoupled from the steam drum. The water circuits are arranged in parallel with each other and feed a single steam drum to provide a steam product of a desired pressure for which only one set of instrumentation is needed.
Claims7
A process for generating steam comprising:
- taking a first hot stream from a process unit to a first heat exchanger;
- indirectly heat exchanging said first hot stream with a first drum water stream from a first steam drum in said first heat exchanger;
- passing steam from said first heat exchanger to said first steam drum;
- passing a first cooled hot stream from said first heat exchanger to a second heat exchanger;
- indirectly heat exchanging said first cooled hot stream with a second drum water stream from a second steam drum in said second heat exchanger;
- passing steam from said second heat exchanger to said second steam drum;
- recovering steam from said first steam drum and said second steam drum;
- recovering a first twice cooled hot stream from said second heat exchanger;
- taking a second hot stream from a process unit to a third heat exchanger;
- indirectly heat exchanging said second hot stream with a third drum water stream from said first steam drum in said third heat exchanger;
- passing steam from said third heat exchanger to said first steam drum;
- passing a second cooled hot stream from said third heat exchanger to a fourth heat exchanger;
- indirectly heat exchanging said second cooled hot stream with a third drum water stream from said second steam drum in said fourth heat exchanger;
- passing steam from said fourth heat exchanger to said second steam drum;
- recovering steam from said first steam drum and said second steam drum;
- and
- recovering a second twice cooled hot stream from said fourth heat exchanger.
Dependencies are inferred from the claim text.