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www.virtualmaterials.com

Benefits of Dynamic Simulation for Integrated Pipelines and Facilities Modeling in the Midstream Sector

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Agenda •  Overview of Dynamic Simulation •  Overview of Multiphase Flow Modeling •  Dynamic Multiphase Flow Application Case

Studies •  Dynamic Plant Application Case Studies •  Summary

*All screenshots taken from VMGSim

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Overview of Dynamic Simula3on

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Typical Modeling Lifecycle

Steady State Rating Model

Conceptual Design Model

SS and Dynamic Shadow Models

Dynamics Rating Model

Conceptual Studies

Front End Design

Detail Design

Training & Commissioning

Monitor and Optimize

Screening Studies Technology selection Economic Justification Base Case Optimization

FEED Off design cases Process Studies Equipment Design

Datasheets Flare design

Improved Startup Controls Testing Loop Tuning Loop Checkout

Operations Planning Training

Profit Improvements Troubleshooting Emissions APC Optimization Performance Modeling Real time models

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What is Rigorous Dynamic Simulation?

•  Imposes time dependency on T, P, Q, Z and holdups

•  Transient pressure gradients and flow resistances define transient flowrates

•  Solves pressures and flows simultaneously using a network solver

•  Energy and composition balances solved for each unit operation

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Why Dynamic Simulation? •  Operations are inherently

dynamic, not at steady state

•  Promotes understanding of responses to simulated process transients

•  Creates a realistic virtual plant by incorporating equipment sizes/geometry and actual control schemes

•  Adds fidelity to model (i.e. time-dependent heat transfer with surroundings)

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Simulate Process Operability During

Upsets

Evaluate Process Equipment and

Control Strategies

Develop Start Up, Shutdown and

Operating Procedures

Perform Regulatory Control System

Configuration and Tuning Studies

Carry Out Step-Testing in an Offline

Environment

Complete Rigorous Blowdown/

Depressuring Safety Studies

Evaluate Relief Loads From Fires,

Reflux Pump, Power Failures, Etc.

Benefits of a Dynamic Model

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Overview of Mul3phase Flow Modeling

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Dynamic Mul3phase Flow Applica3on Case Studies

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Dynamic Plant Applica3on Case Studies

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Case Study – GSP Cryogenic Gas Plant •  Realistic modeling of a GSP

cryogenic gas plant requires: –  High fidelity turbo-expander to

mimic true performance –  Linked shaft w/ inertial torque

limit to capture realistic transient lags

–  Rigorous plate fin exchanger to predict accurate heat transfer & dP

–  Detailed tower and chimney tray w/ static head & friction to predict circulation rates

–  Control loops and controller tunings to reproduce control system behavior

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Case Study – GSP Cryogenic Gas Plant •  Scenario: Transition

from JT mode to turbo-expander mode, track C2 and C3 recoveries

•  Live case here

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Case Study – Flare Network •  Realistic model of a flare network must consider:

–  Initial accumulation and line packing in flare network –  Volumes & fluid inventories of process equipment in network –  Accurate models of blowdown valves, piping, relief devices

and tees/manifolds –  Transient accumulation differences between peak flow in

and peak flow out –  Changing backpressures, temperatures and phases/flow

regimes as fluid flows through the network. –  Reverse flow situations from high-P to low-P volumes –  Detailed choke and multiphase flow methods –  Actual flows (not rated flows) at each transient moment –  Time-dependent blowdown sequencing/scenarios

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Case Study – Flare Network

•  Scenario: Flare network with multiple sources - most flare systems have multiple lines discharging into a common header

•  Live case here.

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Summary •  A software tool that has steady state and transient/

dynamic capabilities improves midstream engineering productivity

•  A software tool that rigorously models both transient multiphase flow in pipelines and integrated plant equipment can unlock additional profitability

•  Virtual models of pipelines and plants are used to analyze process configuration, equipment sizes/geometry, control strategy and controller tuning, safety studies, malfunctions/trips and operating procedures

benefits of dynamic simulation for integrated pipelines ... · benefits of dynamic simulation for...

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