Patent ID: 7730854
Filing Date: 2010-06-08
Classification: F01K,F22B

Abstract:
1. 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; 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.