Abstract
The brazed plate heat exchanger (BPHE) has some advantages over the plate-fin heat exchanger (PFHE) when used in natural gas liquefaction processes, such as the convenient installation and transportation, as well as the high tolerance of carbon dioxide (CO2) impurities. However, the BPHEs with only two channels cannot be applied directly in the conventional liquefaction processes which are designed for multi-stream heat exchangers. Therefore, the liquefaction processes using BPHEs are different from the conventional PFHE processes. In this paper, four different liquefaction processes using BPHEs are optimized and comprehensively compared under respective optimal conditions. The processes are compared with respect to energy consumption, economic performance, and robustness. The genetic algorithm (GA) is applied as the optimization method and the total revenue requirement (TRR) method is adopted in the economic analysis. The results show that the modified single mixed refrigerant (MSMR) process with part of the refrigerant flowing back to the compressor at low temperatures has the lowest specific energy consumption but the worst robustness of the four processes. The MSMR with fully utilization of cold capacity of the refrigerant shows a satisfying robustness and the best economic performance. The research in this paper is helpful for the application of BPHEs in natural gas liquefaction processes.
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Abbreviations
- A :
-
Heat transfer area/m2
- C e :
-
Constant cost of electricity consumption/($·(kW·h)−1)
- h :
-
Mass enthalpy/(kJ·kg−1)
- m :
-
Flowrate/(N·m3·d−1)
- P :
-
Pressure/kPa
- T :
-
Temperature/K
- U :
-
Total heat transfer coefficient/(kW·(K·m2)−1)
- W :
-
Power/kW
- τ :
-
Annual time of operation/h
- BL:
-
Book life
- BOG:
-
Boil-off gas
- BPHE:
-
Brazed plate heat exchanger
- CFD:
-
Computational fluid dynamics
- CH4 :
-
Methane
- C2H4 :
-
Ethylene
- C2H6 :
-
Ethane
- C3H6 :
-
Propylene
- C3H8 :
-
Propane
- CO2 :
-
Carbon dioxide
- COP:
-
Coefficient of performance
- CRF:
-
Capital recovery factor
- DMR:
-
Dual mixed refrigerant
- FC:
-
Fuel cost
- FEM:
-
Finite element method
- GA:
-
Genetic algorithm
- i-C4H10 :
-
Iso-butane
- LNG:
-
Liquefied natural gas
- MR:
-
Mixed refrigerant
- MRC:
-
Mixed refrigerant cycle
- MSMR:
-
Modified single mixed refrigerant
- N2 :
-
Nitrogen
- NGL:
-
Natural gas liquid
- OMC:
-
Operation and maintenance costs
- PEC:
-
Purchased equipment cost
- PFHE:
-
Plate-fin heat exchanger
- PNEC:
-
Parallel nitrogen expansion cycle
- PRICO:
-
Poly refrigerant integrated cycle operations
- ROI:
-
Return on investment
- SEC:
-
Specific energy consumption
- SMR:
-
Single mixed refrigerant
- TCR:
-
Total capital recovery
- TRR:
-
Total revenue requirement
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Wu, J., Ju, Y. Comprehensive comparison of small-scale natural gas liquefaction processes using brazed plate heat exchangers. Front. Energy 14, 683–698 (2020). https://doi.org/10.1007/s11708-020-0705-0
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DOI: https://doi.org/10.1007/s11708-020-0705-0