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Design and performance analysis of a hydrogen liquefaction process

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Abstract

Based on the improved Claude precooling cycle combined with Joule–Brayton refrigeration cycle, a hydrogen liquefaction process with high efficiency and mixed refrigerants is developed. Four independent refrigeration cycles with nitrogen and three different mixed refrigerants are used. By this process, 288.92 tons gaseous hydrogen (25 °C, 21 bar) can be transferred into liquid hydrogen (−253.4 °C, 1.3 bar), and the coefficient of performance (COP), specific energy consumption (SEC) and exergy efficiency are 0.1574, 5.85 kWh/kgLH2 and 55.30%, respectively. Based on the sensitivity analysis, the SEC is reduced to 5.742 kWh/kgLH2, the COP increases to 0.1602, and their variations account for 1.85% and 1.78%, respectively. This study has a guiding significance for the design and optimization of large-scale hydrogen liquefaction process.

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Abbreviations

AC:

Air cooling condenser

C:

Compressor

COP:

Coefficient of performance

EX:

Heat exchanger

Ex:

Expander

F:

Phase separator

J-B:

Joule–Brayton

LMTD:

Logarithmic mean temperature difference

LNG:

Liquified natural gas

MR:

Mixed refrigerant

SEC:

Specific energy consumption

Temp.:

Temperature

A :

Heat transfer area, m2

Cp :

Specific heat capacity, J/(mol K)

\(\mathop {C_{p} }\limits^{ \sim }\) :

Average specific heat capacity, J/(mol K)

\(\dot{E}_{x}\) :

Exergy rate, kW

ex :

Specific exergy, kJ/mol

h :

Enthalpy, kJ/(kg °C)

\(\dot{I}\) :

Irreversible exergy, kW

\(\dot{m}\) :

Mass flow, kg/s

P :

Pressure, bar

\(\dot{Q}\) :

The heat transferred, kW

R :

Thermodynamic constant, J/(mol K)

s :

Specific entropy, kJ/(mol °C)

T :

Temperature, °C

U :

Overall heat transfer coefficient, kW/(m2 °C)

\(\dot{W}\) :

Work across the system boundary, kW

W :

Electrical power, kW

\(\gamma\) :

Pressure ratio

\(\mu_{ex}\) :

Exergy efficiency

\(\xi\) :

Compressor or gas turbine efficiency

H:

Hydrogen

N:

Nitrogen

M:

Mixed refrigerant

ac :

Air cooling condenser

c :

Compressor

Des :

Destruction

e :

Expander

Fs :

Flash

GH 2 :

Gaseous hydrogen

GT :

Gaseous turbine

he :

Heat exchanger

i :

Inlet

LH 2 :

Liquid hydrogen

LN 2 :

Liquid nitrogen

o :

Outlet

th :

Thermal energy

T S :

Total system

v :

Valve

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Acknowledgements

Financial supports provided by the National Natural Science Foundation of China (21736008) and (22078259) are gratefully acknowledged.

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Authors and Affiliations

Authors

Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Shengan Zhang. All authors cooperated to prepare each version of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Guilian Liu.

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Appendix

Appendix

See Tables

Table 8 Parameters of streams

8 and

Table 9 Parameters of heat exchange equipment

9.

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Zhang, S., Liu, G. Design and performance analysis of a hydrogen liquefaction process. Clean Techn Environ Policy 24, 51–65 (2022). https://doi.org/10.1007/s10098-021-02078-z

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  • DOI: https://doi.org/10.1007/s10098-021-02078-z

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