| 摘要 |
PROBLEM TO BE SOLVED: To provide gas supply equipment and a gas supply method using the gas supply equipment, capable of obtaining liquid oxygen and high-purity of liquid argon, supplying oxygen gas to an electric furnace for electric steelmaking and supplying high-purity argon gas to a rectification furnace in the same site of an electric steel plant.SOLUTION: In a site of an electric steel plant, oxygen gas which is obtained in a PSA device 1 and contains a small amount of argon and nitrogen is liquefied to make a first liquid oxygen by means of a first heat exchanger 3 to which the liquefied gas obtained in a liquefying unit 11 is introduced, a part of the first liquid oxygen is stored in a liquid oxygen tank 4, the remaining part is cryogenically separated into a second liquid oxygen and a gas mixture of argon and nitrogen in the first rectification column 5, the gas mixture is cryogenically separated into high-purity liquid argon and nitrogen gas in the second rectification column 6 and the high-purity liquid argon is stored into a liquid argon tank 7. Nitrogen for circulation is circulated through a nitrogen circulation path 9 which passes through a second heat exchanger 8 cooled by second liquid oxygen and the first and the second rectification columns 5, 6. |
