Heat Exchangers Heat Exchangers
Dec 29, 2015
Heat ExchangersHeat Exchangers
Today’s AgendaToday’s Agenda
• Purpose of Heat Exchangers• Three Methods of Temperature
Transfer• Primary Parts• Operation of Heat Exchanger• Applications • Hazards
Purpose of Heat Purpose of Heat ExchangersExchangers
• Transfer heat• Increase production• Prevent thermal shock• Safety• Prevent overheating
Heat Exchange may serve Heat Exchange may serve to:to:
Increase production (pre-heater on reactor)
Prevent thermal shock (pre-heater on distillation column)
Change phase (cool vapor to condense it, or heat a liquid to vaporize it)
Prevent overheating of a process fluid Recover “waste” heat for useful
purposes
Applications of Tube and Applications of Tube and Shell ExchangersShell Exchangers
• Reboiler – Forced feed – Thermosiphon
• Heater/preheater• Aftercooler• Condenser• Chiller• Interchanger
Three Methods of Three Methods of Temperature TransferTemperature Transfer
• Convection• Conduction• Radiation• Convection and conduction is
mostly what occurs in HE
Parts of a Shell and Tube Parts of a Shell and Tube HEHE
• Head• Shell• Tubes – plain or finned• Tube Sheet – keeps tube-side isolated
from shell-side• Baffles – help w/ convection• Tie Rods – support tubes• Nozzles – shell and tube-side
Identify Primary Identify Primary PartsParts
• Tube inlet and outlet• Shell inlet and outlet• Baffle• Exchanger head (channel type)• Tube bundle
Single Pass Counter Flow Single Pass Counter Flow ExchangerExchanger
Operation of Tube and Operation of Tube and ShellShell
ExchangersExchangers• Typical Tube and Shell
Exchangers• Main Components
HazardsHazards
• Personal Safety– Head knockers (valves/pipes)– Goggles or faceshield when draining or venting– Contact w/ chemical hazards– Temp. hazards– Pressure hazards
• Environmental hazards– Leaks
• Equipment– Thermal shock– Fouling
Monitoring and Monitoring and MaintenanceMaintenance
• Look• Listen• Feel
Heat Exchanger Heat Exchanger HazardsHazards
• Individual• Equipment• Production• Environment
Single Pass Shell/Tube Single Pass Shell/Tube CondenserCondenser
Tube FinsTube Fins
Tube BundleTube Bundle
U-Tube BundleU-Tube Bundle
Two Pass Floating Head Two Pass Floating Head Heat ExchangerHeat Exchanger
Kettle Type ReboilerKettle Type Reboiler
Multi Pass Floating Head Multi Pass Floating Head Heat ExchangerHeat Exchanger
Heat Exchanger Heat Exchanger SymbolsSymbols