Analysis of a combined cycle power plant integrated with a liquid natural gas gasification and power generation system

An analysis of a novel liquefied natural gas (LNG) gasification and power generation system integrated with a combined cycle power plant is presented in this article. In the proposed combined cycle, low-temperature waste heat can be efficiently recovered and the cold energy of the LNG can be fully utilized. The latent heat of the spent steam of the steam turbine vaporizes the LNG. The conventional combined cycle and the proposed combined system are simulated using the commercial process simulation package IPSEpro and both energy and exergy analyses are conducted. A parametric analysis has been performed for the proposed combined system to evaluate the effects of several key factors on the performance. The results show that the net electrical efficiency and the total work output of the proposed combined cycle can be increased by 3.8 per cent and 15.6 MW above those of the conventional combined cycle while delivering 33.59 kg/s of natural gas (at 4.3 °C, 0.3 MPa) and saving 0.4 MW of electrical power by removing the need for sea water pumps.

[1]  Yousef S.H. Najjar,et al.  Enhancement of performance of gas turbine engines by inlet air cooling and cogeneration system , 1996 .

[2]  Y Yamasaki,et al.  Proposal for a high efficiency LNG power-generation system utilizing waste heat from the combined cycle , 1998 .

[3]  Yong Tae Kang,et al.  A combined power cycle using refuse incineration and LNG cold energy , 2000 .

[4]  J. Shook.  Recover heat from flue gas , 1991 .

[5]  E. Kakaras,et al.  Combined cycle power plant with integrated low temperature heat (LOTHECO) , 2004 .

[6]  Noam Lior,et al.  A novel near-zero CO2 emission thermal cycle with LNG cryogenic exergy utilization , 2006 .

[7]  Umberto Desideri,et al.  Assessment of LNG Regasification Systems With Cogeneration , 2000 .

[8]  B. Agnew,et al.  Exergy analysis: an absorption refrigerator using lithium bromide and water as the working fluids , 2000, Applied Thermal Engineering.

[9]  L. Tagliafico,et al.  On the recovery of LNG physical exergy by means of a simple cycle or a complex system , 2002 .

[10]  Tae-Seung Kim,et al.  Power augmentation of combined cycle power plants using cold energy of liquefied natural gas , 2000 .

[11]  Andreas Poullikkas,et al.  An overview of current and future sustainable gas turbine technologies , 2005 .

[12]  Xiaojun Shi,et al.  Thermodynamic analysis of an LNG fuelled combined cycle power plant with waste heat recovery and utilization system , 2007 .

[13]  Xiaojun Shi,et al.  A combined power cycle utilizing low-temperature waste heat and LNG cold energy , 2009 .

[14]  D. Che,et al.  Evaluation of retrofitting a conventional natural gas fired boiler into a condensing boiler , 2004 .

[15]  Gary L. Haub,et al.  Options in Gas Turbine Power Augmentation Using Inlet Air Chilling , 1991 .

[16]  Hongtan Liu,et al.  Characteristics and applications of the cold heat exergy of liquefied natural gas , 1999 .