US2011272124A1PendingUtilityA1

Shell And Tube Heat Exchangers

28
Individually held — no corporate assignee on recordPriority: May 7, 2010Filed: May 7, 2010Published: Nov 10, 2011
Est. expiryMay 7, 2030(~3.8 yrs left)· nominal 20-yr term from priority
Inventors:Orlando G. PerezDaniel S. Norton
F28F 9/22F28F 19/00F28D 7/1607
28
PatentIndex Score
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Claims

Abstract

A process for exchanging heat in a shell and tube gas-to-gas heat exchanger between a plurality of gases, said process comprising passing a cold first gas in parallel flow to a second hot gas to provide a warmer first gas; and passing said warmer first gas in counter-current flow to a hot third gas to provide a cooler said third gas. The invention provides increased minimum tube wall temperature within the exchanger for given process conditions while maintaining a high log mean temperature differential allowing for the prevention of corrosion from entrained corrosive vapours or entrained corrosive mist with a minimal increase in effective area.

Claims

exact text as granted — not AI-modified
1 . A process for exchanging heat in a shell and tube gas-to-gas heat exchanger between a plurality of gases,
 said process comprising   passing a cold first gas in parallel flow to a second hot gas to provide a warmer first gas; and   passing said warmer first gas in counter-current flow to a hot third gas to provide a cooler said third gas.   
     
     
         2 . A process as claimed in  claim 1  wherein said second hot gas comprises said cooler said third gas. 
     
     
         3 . A process as claimed in  claim 1  comprising passing said cold first gas as a shell-side gas, and said warmer said first gas as a tube-side gas or a shell-side gas. 
     
     
         4 . A process as claimed in  claim 2  comprising passing said cold first gas as a shell-side gas, and said warmer said first gas as a tube-side gas or a shell-side gas. 
     
     
         5 . A process as claimed in  claim 1  comprising passing said cold first gas as a tube-side gas and said warmer said first gas as a tube-side gas or a shell-side gas. 
     
     
         6 . A process as claimed in  claim 2  comprising passing said cold first gas as a tube-side gas and said warmer said first gas as a tube-side gas or a shell-side gas. 
     
     
         7 . A process as claimed in  claim 1  further comprising removing a portion of said warmer said first gas from said heat exchanger. 
     
     
         8 . A process as claimed in  claim 2  further comprising removing a portion of said warmer said first gas from said heat exchanger. 
     
     
         9 . A process as claimed in  claim 1  further comprising removing a portion of said cooler said third gas from said heat exchanger. 
     
     
         10 . A process as claimed in  claim 1  further comprising feeding a portion of said hot third gas in admixture with said cooler said third gas in parallel flow to said cold first gas. 
     
     
         11 . A process as claimed in  claim 1  further comprising feeding a portion of said cold first gas in admixture with said warmer said first gas in counter-current flow to said hot third gas. 
     
     
         12 . A process as claimed in  claim 1  wherein said hot first gas comprises sulphur trioxide. 
     
     
         13 . A process as claimed in  claim 1  wherein said hot first gas comprises entrained corrosive liquid droplets. 
     
     
         14 . A process as claimed in  claim 1  wherein said cold first gas comprises entrained corrosive liquid droplets. 
     
     
         15 . A process as claimed in  claim 1  wherein said second cold gas comprises air. 
     
     
         16 . A process for the manufacture of sulphuric acid by the contact process comprising a process as claimed in  claim 1 . 
     
     
         17 . A process for exchanging heat in a shell and tube gas-to-gas heat exchanger between a first hot gas and a cold second gas as claimed in  claim 1  in hydrocarbon power generation plants. 
     
     
         18 . A gas-to-gas heat exchanger comprising
 a shell and tube first section comprising   means for receiving a cold first gas;   means for receiving a hot second gas; and   means for passing said cold first gas in parallel flow to said hot second gas to provide a warmer said first gas;   a shell and tube second section comprising   means for receiving a hot third gas;   means for receiving said warmer said first gas; and   means for passing said hot third gas in counter-current flow to said warmer said first gas to provide a cooler said third gas.   
     
     
         19 . A heat exchanger as claimed in  claim 18  wherein said means for receiving said hot second gas comprises means for receiving said cooler said third gas. 
     
     
         20 . A heat exchanger as claimed in  claim 19  wherein said cooler said third gas constitutes said hot second gas.

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