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Comprehensive comparison of small-scale natural gas liquefaction processes using brazed plate heat exchangers

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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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