joel v. madison ebara international corporation cryodynamics division sparks, nv aiche spring...
TRANSCRIPT
SOLVING NEW DEMANDS IN LNG TECHNOLOGY USING
FIELD-PROVEN LNG EXPANDERS AND PUMPS
Joel V. Madison
Ebara International Corporation
Cryodynamics Division
Sparks, NV
AIChE Spring Meeting
April 26-30, 2009
Tampa, Florida
Biography: Joel MadisonJoel Madison graduated in 1988 with a Master of Science Degree in Aerospace Engineering from the Pennsylvania State University. He joined Ebara International in 1995 after working as a research engineer in the field of hypersonic propulsion in support of NASA’s development programs . He is currently serving as Chief Executive Officer the corporation. In addition to his responsibilities related to corporate management, he is still actively participating in development of novel technologies.
SOLVING NEW DEMANDS IN LNG TECHNOLOGY USING
FIELD-PROVEN LNG EXPANDERS AND PUMPS
Joel V. Madison
Ebara International Corporation
Cryodynamics Division
Sparks, NV
AIChE Spring Meeting
April 26-30, 2009
Tampa, Florida
Overview
Compact Configurations
Tandem Expander
Integrated Expander
Cross-Flow Expander
Cross-Flow Pump
Conclusions
Compact Pump-Expander:Design Options
Pump & expander separated by a seal
Common shaft Common
motor/generator LNG & MR streams TEM Two-phase
possibility
Compact Pump-Expander:Design Options Continued
Separate the motor/generator and cool with another available fluid, N2
Thrust balance with third fluid
Two-phase expansion option
Compact Expander-Expander:Design Options
2 Expanders separated by a seal
Common shaft Common generator LNG & MR streams TEM Two-phase possibility
Compact Expander-Expander:Design Options Continued
Option to separate the generator and cool with another available fluid, N2
Thrust balance with third fluid
Compact Designs: Advantages Thrust is minimized due to opposite flow
directions on a common shaftLess fluid is required for thrust balancingThrust balancing using MR streamHydraulic efficiency increases
Cooling motor/generator with MR stream increases process efficiencyHeat transfer to MR stream not LNG
Compact Designs: Advantages Continued Separating the motor/generator
increases both process and hydraulic efficiencyHeat transfer is absorbed by another fluidThrust balancing achieved with third fluid
Compact Design = small footprint
Easily integrated into existing plants
Compact Designs: Advantages Continued
Increases electrical efficiency
Construction cost and payback period reduction
Overall increase in plant efficiency
Tandem Expander:Design Two expanders located
in one vessel Operate in series Accommodate large
head with minimal increase in diameter
Finely tune to optimal operating point
Two-phase possibility
Tandem Expander:Advantages
Accommodate larger differential pressures without increasing diameter
Allows for multi-phase capacity and replaces both single and two-phase expansion through JT valves
Greater flexibility
Tandem Expander:Advantages Continued
Constant adjustment to process conditions maintains the best efficiency
Small footprint
Reduction in construction costs
Reduction in machine cost
Integrated Expander:Concept
Traditional Integrated Expander
JT Bypass Valve
7% Pipe Cooling Leakage Flow
Expander External JT Valve
0% Pipe Cooling Leakage Flow
Expander
Integrated Expander:Design
Expander and JT operating in parallel inside one vessel
Motorized cross-flow JT valve
Two-phase possibility
Integrated Expander:Cross-Flow Valve
Cross-flow JT Valve Cross-Flow JT Valve Operation
Integrated Expander:Advantages
Eliminate required leakage flow to keep bypass cold
Optimize power output for both reduced and overflow conditions
Optimizing Power Output for Reduced Flow
Optimizing Power Output for Overflow
Cross-Flow Expander:Design
Two expanders mounted in one vessel
Separate shafts and generators
Operate in parallel
Cross-Flow valve allows for flow control to both machines
Two-phase possibility
Cross-Flow Pump:Design
Two pumps mounted in one vessel
Separate shafts and motors
Operate in parallel
Cross-Flow valve between pumps to control flow for both machines
Cross-Flow Pump:Design Continued
Same design, with the addition of a smaller feeder pump
Feeder pump to increase head and account for height difference between upper and lower pumps
Cross-Flow Expander & Pump:Advantages
Up to 50% turndown
Maintain high machine efficiency with
turndown
Higher flow capacity
Greater flexibility
Cross-Flow Expander & Pump:Advantages
Compact footprint
Piping reduction
Minimize construction costs
Maintain reasonable machine diameter
Maintain typical machine cost
Conclusions
New solutions using proven machinery to provide solutions to new demands in:HeadFlowEfficiencyFlexibilityCompact sizeCost effectiveRetro-fit for older plants