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04_Rotating_Equipment.pdf

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Rotating Equipment: Pumps, Compressors, & Turbines/Expanders Chapters 2 & 9 Topics Fundamentals Equipment  Starting relationships  Pumps ã Thermodynamic relationships ã Centrifugal pumps ã Bernoulli’s equation ã Reciprocating pumps  Simplifications ã Gear pumps ã Pumps – constant density compression  Com
Transcript
  Rotating Equipment: Pumps, Compressors, & Turbines/Expanders Chapters 2 & 9  Updated: February 6, 2018Copyright © 2017 John Jechura (jjechura@mines.edu)Updated: February 6, 2018Copyright © 2017 John Jechura (jjechura@mines.edu) Topics Fundamentals  Starting relationships ãThermodynamic relationshipsãBernoulli’s equation  Simplifications ãPumps –constant density compressionãCompressors –reversible ideal gas compression  Use of PH & TS diagrams  Multistaging Efficiencies  Adiabatic/isentropic vs. mechanical  Polytropic Equipment  Pumps ãCentrifugal pumpsãReciprocating pumpsãGear pumps  Compressors ãCentrifugal compressorsãReciprocating compressorsãScrew compressorsãAxial compressors  Turbines & expanders ãExpanders for NGL recoveryãGas turbines for power production o What is “heat rate”? 2  Updated: February 6, 2018Copyright © 2017 John Jechura (jjechura@mines.edu)Updated: February 6, 2018Copyright © 2017 John Jechura (jjechura@mines.edu) Fundamentals  Updated: February 6, 2018Copyright © 2017 John Jechura (jjechura@mines.edu)Updated: February 6, 2018Copyright © 2017 John Jechura (jjechura@mines.edu) Review of Thermodynamic Principals 1 st Law of Thermodynamics –Energy is conserved  (Change in system’s energy) = (Rate of heat added) –(Rate of work performed)  Major energy contributions ãKinetic energy –related to velocity of systemãPotential energy –related to positon in a “field” (e.g., gravity)ãInternal energy –related to system’s temperature o Internal energy, U, convenient for systems at constant volume & batch systems o Enthalpy, H = U+PV, convenient for systems at constant pressure & flowing systems 4 ˆ EQW     2 ˆˆ2 cc ugEUhgg    2 ˆˆ2 cc ugEHhgg   
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