GPPC and GPRC Technology Targets Gas Plant Performance
Barry D. Payne & Associates Inc. offer Advanced Process Control
strategies designed for multiple platforms, that deliver plant
improvements with your current controls today!
On Target Solutions
include Advanced Gas Processing Control technology that delivers
performance comparable to, or better than complex multi-variable control
packages. This technology runs in your DCS, or your PLC, or can be
scaled down to a Multi-Loop Controller, and requires no host or
supervisory computer. Ongoing maintenance costs are significantly
less than multi-variable controllers, while the installed cost of BDP
On Target Solutions is typically less than 25% of a
multi-variable control software application.
In Cryogenic Demethanizers, the
controls incorporate two major elements:
- GPPC - Gas Processing Performance
Control - with C1/C2 or C2/C3 Composition Control and Cold
Separator temperature control for maximum liquids recovery - combining
inputs from an Onstream Analyzer, DeC1 Pressure, Inlet Gas Flow,
Expander Outlet Temperature, and Reboiler Duty calculations to yield
stable, reliable composition control and recovery from upsets.
In a recent paper, the GPPC
controller was compared to a multi-variable controller costing in
excess of six figures. Standard deviation of the liquid to
volume ratio C1/C2 data for the two strategies differed by only 0.15%,
even though the total cost of the BDP On Target Solution was less than
$20,000.
- GPRC - Gas Processing Rate
Control - with the composition under control, this Capacity
Controller manipulates Cryo Processing Pressures and Recompressor
Speeds or Recycle valves. It seeks whichever limit
(Inlet/Residue Pressure or Treating/Cryo Flow) is currently in effect,
while being constrained from lowering Tower Pressure below "Coldspin"
or Recompressor limits (Surge, Low Suction Shutdown, or Rod Loading).
This results in minimum pressure at any rate, normally maximizing
recovery. If fuel costs outweigh Ethane values, the order can be
reversed, minimizing Recompressor horsepower at any throughput.
The GPRC controller has been
utilized to balance parallel Cryo Plants with shared or split
recompression, without wasting horsepower on "back-pressure" valves or
other means.
Gas Processing Performance
Strategies
Scalable CryoPlant Control
Solutions for Your Current Automation Platform
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