Abstract
One of the principal challenges facing today’s society is the necessity to discover more environmentally friendly, futureproof energy sources. In this scope, natural gas, ensued by liquefied natural gas, is an ever more important cornerstone on the path towards a low-carbon economy. The present study evaluates the processes employed for small-scale liquefied natural gas (SSLNG) plants. Three processes, namely, dual expansion, pre-cooled PRICO, and nitrogen expansion, and thereof, conventional and advanced exergoeconomic analyses are applied to appraise the performance of the processes. In the energy analysis, three parameters were assessed, namely, specific power consumption, the figure of merit, and the coefficient of performance. The precooled PRICO and the nitrogen expansion processes were the performant in the first two, and the third, respectively. The exergy efficiency in the three processes was 74%, 76%, and 75%, respectively. In all processes, the exogenous exergy destruction share was higher than endogenous, meaning that the internal irreversibility in other equipment substantially affects the exergy destruction in the equipment under analysis. The pre-cooled PRICO process had the highest exergoeconomic factor followed by the dual expansion process, both near 0.3. The highest avoidable endogenous exergy destruction costs in all processes were pertinent to the air coolers, gauged at 862.33, 308.23, and 71.67 $/h, respectively. Also, the highest avoidable endogenous investment cost rates were associated with C1, C2, and T1 equipment measured at 68.958, 49.42, and 3.38 $/h, respectively. The modified exergy efficiency was higher than the conventional exergy efficiency in all components of the three processes.
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Abbreviations
- CL:
-
Cooler
- C:
-
Compressor
- E:
-
Heat exchanger
- V:
-
Expansion valve
- T:
-
Turboexpander
- D:
-
Drum
- P:
-
Pump
- NG:
-
Natural gas
- LNG:
-
Liquefied natural gas
- SMR:
-
Single mixed refrigerant
- DMR:
-
Dual mixed refrigerant
- PFHE:
-
Plate-fin heat exchanger
- SWHE:
-
Spiral wound heat exchanger
- FoM:
-
Figure of merit
- CoP:
-
Coefficient of performance
- SPC:
-
Specific power consumption
- mtpa:
-
Mega ton per annum
- PRICO:
-
Poly refrigerant integral cycle operation
- SPECO:
-
Specific exergy costing
- PR:
-
Peng–Robinson
- PRSV:
-
Peng–Robinson–Stryjek–Vera
- \(I\) :
-
Irreversibility (kW)
- \(e\) :
-
Specific stream exergy
- \(E\) :
-
Exergy (kW)
- \(\dot{E}\) :
-
Stream exergy (kW)
- \(S\) :
-
Entropy (kJ/kgC)
- \(\dot{m}\) :
-
Flow rate (kg/s)
- \(Q\) :
-
Heat (kW)
- \(W\) :
-
Work (kW)
- \(m\) :
-
Number of cold streams
- \(n\) :
-
Number of warm streams
- \(\mathrm{BL}\) :
-
Book life (factory)
- \(c\) :
-
Unit exergy cost rate ($/kJ)
- \(C\) :
-
Exergy cost rate
- \(f\) :
-
Exergoeconomic factor
- \(\mathrm{FC}\) :
-
Fuel cost ($/s)
- \(j\) :
-
The jth year of operation
- \(\mathrm{OMC}\) :
-
Operation & maintenance cost ($)
- \(\mathrm{PEC}\) :
-
Purchase equipment cost ($)
- \(\mathrm{CRF}\) :
-
Capital recovery factor
- \(r\) :
-
Relative cost difference
- \(\mathrm{ROI}\) :
-
Return of investment
- \({\dot{Z}}_{k}\) :
-
Capital cost flow rate
- \(y\) :
-
Exergy destruction ratio
- \(T\) :
-
Temperature
- \(P\) :
-
Pressure
- \({f}_{k}\) :
-
Exergoeconomic factor
- \(i\) :
-
Input
- \(i\) :
-
Component
- \(o\) :
-
Output
- \(sh\) :
-
Shaft
- \(a\) :
-
Air
- \(L\) :
-
Loss
- \(\mathrm{tot}\) :
-
Total
- \(c\) :
-
Cold
- \(h\) :
-
Hot
- \(k\) :
-
kth equipment
- \(D\) :
-
Destruction
- \(P\) :
-
Product
- \(F\) :
-
Fuel
- \(\mathrm{others}\) :
-
Other equipment
- \(\Delta P\) :
-
Pressure component
- \(\Delta T\) :
-
Thermal component
- \(\mathrm{AV}\) :
-
Avoidable
- \(\mathrm{UN}\) :
-
Unavoidable
- \(\mathrm{EN}\) :
-
Endogenous
- \(\mathrm{EX}\) :
-
Exogenous
- ε :
-
Exergy efficiency
- \({\varepsilon }_{\mathrm{modified}}\) :
-
Modified exergy efficiency
- \(\Delta\) :
-
Gradient
- Τ:
-
Annual hour operation
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MD was involved in the formal analysis and investigation, methodology, data curation, software, validation, resources, and writing—original draft; HS contributed to the conceptualization, supervision, review and editing; SMH helped in the conceptualization, supervision, review and editing; MM was involved in the conceptualization, supervision, review and editing.
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Delpisheh, M., Saffari, H., Hosseinalipour, S.M. et al. Evaluation of small-scale liquefied natural gas (SSLNG) processes: advanced exergoeconomic analysis. Chem. Pap. 76, 7373–7394 (2022). https://doi.org/10.1007/s11696-022-02408-5
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DOI: https://doi.org/10.1007/s11696-022-02408-5