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Solving New Demands In LNG Technology using field-proven lng expanders and pumps

Joel V. Madison Ebara International Corporation Cryodynamics Division Sparks, NV. Solving New Demands In LNG Technology using field-proven lng expanders and pumps. AIChE Spring Meeting April 26-30, 2009 Tampa, Florida. Biography: Joel Madison.

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Solving New Demands In LNG Technology using field-proven lng expanders and pumps

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  1. Joel V. Madison Ebara International Corporation Cryodynamics Division Sparks, NV Solving New Demands In LNG Technology using field-proven lng expanders and pumps AIChE Spring Meeting April 26-30, 2009 Tampa, Florida

  2. Biography: Joel Madison Joel 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. jmadison@ebaraintl.com

  3. Joel V. Madison Ebara International Corporation Cryodynamics Division Sparks, NV Solving New Demands In LNG Technology using field-proven lng expanders and pumps AIChE Spring Meeting April 26-30, 2009 Tampa, Florida

  4. Overview • Compact Configurations • Tandem Expander • Integrated Expander • Cross-Flow Expander • Cross-Flow Pump • Conclusions

  5. Compact Pump-Expander:Design Options • Pump & expander separated by a seal • Common shaft • Common motor/generator • LNG & MR streams • TEM • Two-phase possibility

  6. 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

  7. Compact Expander-Expander:Design Options • 2 Expanders separated by a seal • Common shaft • Common generator • LNG & MR streams • TEM • Two-phase possibility

  8. Compact Expander-Expander:Design Options Continued • Option to separate the generator and cool with another available fluid, N2 • Thrust balance with third fluid

  9. Compact Designs: Advantages • Thrust is minimized due to opposite flow directions on a common shaft • Less fluid is required for thrust balancing • Thrust balancing using MR stream • Hydraulic efficiency increases • Cooling motor/generator with MR stream increases process efficiency • Heat transfer to MR stream not LNG

  10. Compact Designs: Advantages Continued • Separating the motor/generator increases both process and hydraulic efficiency • Heat transfer is absorbed by another fluid • Thrust balancing achieved with third fluid • Compact Design = small footprint • Easily integrated into existing plants

  11. Compact Designs: Advantages Continued • Increases electrical efficiency • Construction cost and payback period reduction • Overall increase in plant efficiency

  12. 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

  13. 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

  14. Tandem Expander:Advantages Continued • Constant adjustment to process conditions maintains the best efficiency • Small footprint • Reduction in construction costs • Reduction in machine cost

  15. Integrated Expander:Concept Expander JT Bypass Valve External JT Valve Expander 7% Pipe Cooling Leakage Flow 0% Pipe Cooling Leakage Flow Traditional Integrated Expander

  16. Integrated Expander:Design • Expander and JT operating in parallel inside one vessel • Motorized cross-flow JT valve • Two-phase possibility

  17. Integrated Expander:Cross-Flow Valve Cross-flow JT Valve Cross-Flow JT Valve Operation

  18. Integrated Expander:Advantages • Eliminate required leakage flow to keep bypass cold • Optimize power output for both reduced and overflow conditions

  19. Optimizing Power Output for Reduced Flow

  20. Optimizing Power Output for Overflow

  21. 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

  22. 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

  23. 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

  24. Cross-Flow Expander & Pump:Advantages • Up to 50% turndown • Maintain high machine efficiency with turndown • Higher flow capacity • Greater flexibility

  25. Cross-Flow Expander & Pump:Advantages • Compact footprint • Piping reduction • Minimize construction costs • Maintain reasonable machine diameter • Maintain typical machine cost

  26. Conclusions • New solutions using proven machinery to provide solutions to new demands in: • Head • Flow • Efficiency • Flexibility • Compact size • Cost effective • Retro-fit for older plants

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