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Dynamic Operability Analysis for Process Design and Control of Modular Natural Gas Utilization Systems.

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Summary
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Modular process design offers efficiency but poses operational challenges. This study introduces operability analyses to identify and control operable modular units, enhancing process safety and performance.

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Area of Science:

  • Chemical Engineering
  • Process Systems Engineering
  • Modular Process Design

Background:

  • Modular plants offer advantages in efficiency and safety over conventional construction.
  • However, modularization leads to reduced control degrees of freedom, complicating operations.
  • Process integration and intensification in modular designs present unique operability challenges.

Purpose of the Study:

  • To develop and apply operability analyses for the design and operation of modular process units.
  • To identify feasible and dynamically operable modular designs capable of disturbance rejection.
  • To evaluate and compare the performance of different operable modular designs using closed-loop control.

Main Methods:

  • Steady-state operability analysis to determine feasible modular designs under various conditions.
  • Dynamic operability analysis to assess the disturbance rejection capabilities of feasible designs.
  • Implementation in a modular membrane reactor with closed-loop nonlinear model predictive control (NMPC).

Main Results:

  • A set of feasible modular designs was identified for operation under different modular plant conditions.
  • Operable designs capable of rejecting operational disturbances were successfully identified.
  • The closed-loop NMPC performance was evaluated for different operable modular membrane reactor designs.

Conclusions:

  • Operability analyses are crucial for addressing the challenges of modular process design and operation.
  • The proposed framework enables the selection of robust and controllable modular units.
  • This approach enhances the safe and efficient operation of intensified modular systems, demonstrated via a membrane reactor example.