Thermodynamic analysis and optimization of an ammonia-water power system with LNG (liquefied natural gas) as its heat sink

Energy ◽  
2013 ◽  
Vol 50 ◽  
pp. 513-522 ◽  
Author(s):  
Jiangfeng Wang ◽  
Zhequan Yan ◽  
Man Wang ◽  
Yiping Dai
Keyword(s):  
Natural Gas ◽  
Power System ◽  
Thermodynamic Analysis ◽  
Heat Sink ◽  
Liquefied Natural Gas ◽  
Ammonia Water ◽  
Water Power

Thermodynamic Analysis of a SCO2 Part-Flow Cycle Combined With an Organic Rankine Cycle With Liquefied Natural Gas as Heat Sink

2014 ◽  
Author(s):  
Hanzhen Zhang ◽  
Shuai Shao ◽  
Hang Zhao ◽  
Zhenping Feng
Keyword(s):  
Natural Gas ◽  
Power System ◽  
Heat Sink ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Liquefied Natural Gas ◽  
Operating Conditions ◽  
Flow Cycle ◽  
Integrated Power System

The supercritical carbon dioxide (SCO2) part-flow cycle can achieve higher efficiency compared with conventional Brayton cycle as it can avoid the pinch point problem inside the regenerative heat exchanger. To recover the waste heat from the pre-cooler in the cycle and improve the overall cycle efficiency, a new integrated power system driven by nuclear reactor is proposed to achieve the energy cascade utilization. This system combines a SCO2 part-flow cycle with an organic Rankine cycle (ORC) using liquefied natural gas (LNG) as heat sink to utilize the cold energy of LNG. In this paper a mathematical model is established to simulate the SCO2 part-flow cycle coupled with an ORC under steady state condition, and a thermodynamic parametric analysis is conducted to investigate the effects of some key parameters, including the turbine inlet pressure, the turbine and compressor isentropic efficiency and pressure drop ratio, on the system performance. The results indicate that the integrated power system is effective to recover the waste heat and may achieve the overall cycle thermal efficiency of 52.12% under the operating conditions of 20MPa, 800K and part-flow ratio 0.68, which can be further improved with parametric optimization of the system.

Thermodynamic analysis of liquefied natural gas (LNG) production cycle in APCI process

2012 ◽  
Vol 21 (6) ◽  
pp. 564-571 ◽  
Author(s):  
Shahrooz Abbasi Nezhad ◽  
Bezhan Shabani ◽  
Majid Soleimani
Keyword(s):  
Natural Gas ◽  
Thermodynamic Analysis ◽  
Liquefied Natural Gas ◽  
Production Cycle
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