| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an oxygen-enriched air producing system capable of changing production quantity of oxygen-enriched air and inexpensively producing oxygen-enriched air irrespective of production quantity.SOLUTION: An oxygen-enriched air producing system 10 includes: a first heat exchanger 14 which performs heat exchanging between liquefied natural gas to be supplied to a facility 55 for combusting natural gas and air; a compressor 15 for compressing the air subjected to heat exchanging in the first heat exchanger 14, to a predetermined pressure; a second heat exchanger 16 which performs heat exchanging between the compressed air and the liquefied natural gas; an expansion valve 18 which adiabatically expands the air subjected to heat exchanging in the second heat-exchanger 16; and a gas-liquid separation device 19 which performs gas-liquid separation of the air adiabatically expanded. The compression ratio of the compressor 15 and the opening of the expansion valve 18 are respectively preset such that temperature of the air after adiabatic expansion is higher than the boiling point of nitrogen and is equal to the boiling point of oxygen or less.</p> |
