ChemCAD Heat Exchangers

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Presentation transcript:

ChemCAD Heat Exchangers Group 9 Erika Gesso, Alex Hemmer, Evan Jacque, & Rachel Simoncic

Why Add a Heat Exchanger? Recover heat that may otherwise be lost Preheat earlier streams using this recycled heat Preheat stream in order to reduce overall heating time Example: preheating a stream prior to entering a reactor Allows for reaction to activate more quickly

Types of Heat Exchangers Fired Heater Multi-Stream Exchanger

2 common ways to use heat exchanger 1 Simple Heat Exchanger Two-sided Heat Exchanger

Before Alteration: Input Stream Determine input stream parameters and composition

Simple Heat Exchanger: Specifications Add pressure drop Input design parameter Calculates Utility, LMTD

Simple Heat Exchangers: Utility Rating Input service fluid T’s Can input U and A if known Shells and passes affect LMTD Heat value and holdup optional

Simple Heat Exchangers: Economics Calculated with U and A given Costing varies with models Factors defaulted if not given Some depend on area Identical for Two-sided HE

Simple Heat Exchangers Keep in mind: Outlet Temperature will not be achieved if U and A are provided

Two-sided Heat Exchangers: Specifications Can be used for 2 process streams Can be used to determine utility flow 1 spec for no utility, 2 for utility

Two-sided Heat Exchangers: Misc. Can specify configuration, zones, passes, holdup Calculated results from simulations

Fired Heat Exchanger

Fired Heater

Fired Heater Minimum : Input temperature out Common Fuel Heating Values Methane: 910 BTU/ft3 Propane: 2371 BTU/ft3

Fired Heater Cost Estimation Input Design Information Type Design Material Pressure Can calculate automatically

Multi-Stream Exchangers

Multi-Stream Exchangers: Specifications Specifying pressure drop not required Can specify: Temp. Out Vapor Frac. Out Heat Duty Delta T (in-out) Can only specify N-1 streams (i.e. for these three streams, specify two)

Generating Heat Curves

Step 1: Select UnitOp Step 2: Specify Tube-side Inlet Stream

See Flow Summaries Heat Curve Parameters Number of cutting points Countercurrent vs. Cocurrent

Additional Features: Tube & Shell Specifications Nozzle Specifications Baffle Specifications Material Specifications

Questions?

Works Cited "Fuel Gases Heating Values." Fuel Gases Heating Values. The Engineering Toolbox, Web. 01 Feb. 2017. Putman, Richard E. "The Importance of Process Heat Exchangers in Industrial Energy Systems." ASME Digital Collection. The American Society of Mechanical Engineers. Web. 31 Jan. 2017. Weise, Lisa. "Heat Exchanger Simulation." AccessScience.Chemstations. Chemstations Europe GmbH. Web. 31 Jan. 2017.