Novel combined cycle configurations for propane pre-cooled mixed refrigerant (APCI) natural gas liquefaction cycle

A significant amount of energy is required for natural gas liquefaction. Due to the production scale of LNG plants, they consume an intensive amount of energy. Consequently, any enhancement to the energy efficiency of LNG plants will result in a considerable reduction in natural gas consumption and CO2 emission. Compressor drivers are the main energy consumer in the LNG plants. In this paper, 14 different driver cycle enhancement options were considered. A number of these options have not been proposed for the LNG plants. The new driver cycle development was performed by analyzing and optimizing the design variables of four conventional driver cycle enhancement options. The optimization results were used to develop more efficient cycles through mitigating the active constrains and driver cycle innovations. Based on the current available technologies five of our newly developed driver cycle configurations have higher efficiency than the most efficient existing conventional driver cycle. The best developed driver cycle enhancement option improved the base driver cycle energy efficiency by 38%. The effects of technological advancement on the performances of the all driver cycle enhancement options were also considered.

[1]  Reinhard Radermacher,et al.  Enhancement of LNG plant propane cycle through waste heat powered absorption cooling , 2012 .

[2]  Robin Smith,et al.  Optimal Synthesis of Mixed-Refrigerant Systems for Low-Temperature Processes , 2002 .

[3]  Reinhard Radermacher,et al.  Modeling water/lithium bromide absorption chillers in ASPEN Plus , 2011 .

[4]  Reinhard Radermacher,et al.  Application of waste heat powered absorption refrigeration system to the LNG recovery process , 2009 .

[5]  Jasbir S. Arora,et al.  Introduction to Optimum Design , 1988 .

[6]  Jin-Kuk Kim,et al.  Synthesis of mechanical driver and power generation configurations, Part 2: LNG applications , 2010 .

[7]  Christopher Michael Somers,et al.  SIMULATION OF ABSORPTION CYCLES FOR INTEGRATION INTO REFINING PROCESSES , 2009 .

[8]  Iftekhar A. Karimi,et al.  Optimization of Compressor Networks in LNG Operations , 2009 .

[9]  Mehmet Kanoglu,et al.  Cryogenic turbine efficiencies , 2001 .

[10]  Colin Grant,et al.  7th World Congress of Chemical Engineering: A Review , 2005 .

[11]  Christopher Michael Somers,et al.  Modeling absorption chillers in ASPEN , 2009 .

[12]  Costas D. Maranas,et al.  Synthesis of Mixed Refrigerant Cascade Cycles , 2002 .

[13]  A. Aspelund,et al.  An optimization-simulation model for a simple LNG process , 2010, Comput. Chem. Eng..

[14]  Brad S. Hubbard.  A fresh approach to LNG , 2004 .

[15]  Adrian Joseph Finn,et al.  Developments in natural gas liquefaction , 1999 .

[16]  Reinhard Radermacher,et al.  Performance enhancement of propane pre-cooled mixed refrigerant LNG plant , 2012 .

[17]  Reinhard Radermacher,et al.  Optimization of propane pre-cooled mixed refrigerant LNG plant , 2011 .

[18]  Reinhard Radermacher,et al.  Absorption Chillers and Heat Pumps , 1996 .

[19]  Jin-Kuk Kim,et al.  Synthesis of mechanical driver and power generation configurations, Part 1: Optimization framework , 2010 .

[20]  Jin-Kuk Kim,et al.  Optimal Design of Mixed Refrigerant Cycles , 2008 .

[21]  Reinhard Radermacher,et al.  Enhancement of APCI cycle efficiency with absorption chillers , 2010 .