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Abstract
The thermodynamic design of a small scale air/oxygen liquefier is presented in this paper, which could be a low-cost choice under remote and field conditions. Feed gas is liquefied by a dual mixed-refrigerant (DMR) J-T process driven by single-stage compressors. Low pressure (<8.0 bar) gas sources could be adopted in the system, such as small commercial air compressors and normal PSA oxygen generators. All the components of mixed-refrigerants are non-flammable, which are safe for the liquefaction of air and O2. Component selection, process configuration design and performance analysis are studied. Ne-N2-Ar-Freon mixtures are employed as the refrigerant. For air liquefaction, simulated specific power consumption (SPC) of 0.73 kWh L−1 and figure of merit (FOM) of 24.76% are achieved. For O2 liquefaction, simulated SPC of 0.71 kWh L−1 and FOM of 27.90% are reached.
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Details
1 Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry (TIPC) Chinese Academy of Sciences (CAS), Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China
2 Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry (TIPC) Chinese Academy of Sciences (CAS), Beijing 100190, China