CHM 320

Process Fundamentals

  • Process: A series of actions to transform inputs into outputs.

    • Components:

    • Inputs: Raw materials required to start the process.

    • Steps/Operations: Actions (e.g., mixing, heating) taken to transform inputs to outputs.

    • Outputs: Finished products/results produced.

    • Control and Feedback: Monitoring process variables (temperature, pressure, flow rate) to ensure desired outcome.

Process Variables

  • Definition: Measurable quantities that characterize a physical system/process.

  • Importance: Critical for improving efficiency, quality, safety, and reducing waste.

  • Types:

    • Temperature: Measured using thermocouples/thermometers.

    • Pressure: Measured with pressure gauges/transducers.

    • Flow Rate: Measured using flow meters/mass flow controllers.

Material Balance

  • Definition: Accounting of materials entering/leaving a system; based on conservation of mass.

  • Uses:

    • Estimation of reservoir volumes (oil, water, gas).

    • Predicting reservoir performance and recovery efficiency.

    • Ensuring accuracy during phase transitions.

Flow Sheet

  • Function: Key document in process design, showing equipment arrangement, stream connections, and conditions.

  • Uses:

    • Foundation for piping, instrumentation, equipment design.

    • Helps with operator training and performance comparison during operations.

Energy Balance

  • Equation: Ein−Eout=extChangeinInternalEnergyE_{in} - E_{out} = ext{Change in Internal Energy}.

  • Application: Accounts for energy conservation in systems including heat, work, and mass transfer.

General Balance Equation

  • Formulation: Input+Generation−Output−Consumption=AccumulationInput + Generation - Output - Consumption = Accumulation.

  • Significance: Tracks quantities (mass, energy) within a system, ensuring net transfers equal changes over time.

Fluid Flow

  • Definition: Continuous movement of liquids or gases under applied forces.

  • Types:

    • Laminar Flow: No mixing between fluid layers, viscous forces dominate.

    • Turbulent Flow: Mixing of fluid layers, inertial forces dominate.

    • Transitional Flow: Between laminar and turbulent.

  • Reynolds Number: Measures flow regime; determines if flow is laminar or turbulent:

    • Re=racPVL<br>uRe = rac{PVL}{<br>u}

    • Critical values: <2000 (laminar), >4000 (turbulent).