Heat Exchangers This is session 19 in curriculum manual

Today’s Agenda Purpose of Heat Exchangers Three Methods of Temperature Transfer Primary Parts Operation of Heat Exchanger Applications Hazards

Purpose of Heat Exchangers Transfer heat Increase production Prevent thermal shock Safety Prevent overheating

Heat Exchange may serve 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 Shell Exchangers Reboiler Forced feed Thermosiphon Heater/preheater Aftercooler Condenser Chiller Interchanger

Three Methods of Temperature Transfer Convection Conduction Radiation Convection and conduction is mostly what occurs in HE

Parts of a Shell and Tube HE 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 Parts Tube inlet and outlet Shell inlet and outlet Baffle Exchanger head (channel type) Tube bundle

Single Pass Counter Flow Exchanger

Operation of Tube and Shell Exchangers Typical Tube and Shell Exchangers Main Components

Hazards Personal Safety Environmental hazards Equipment 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 Maintenance Look Listen Feel

Heat Exchanger Hazards Individual Equipment Production Environment

Single Pass Shell/Tube Condenser

Tube Fins

Tube Bundle

U-Tube Bundle

Two Pass Floating Head Heat Exchanger

Kettle Type Reboiler

Multi Pass Floating Head Heat Exchanger

Heat Exchanger Symbols