| 摘要 |
PURPOSE:To keep the temperature of the title heat exchangers balanced in a stabilized condition by a method wherein in the reversible heat exchangers for an air separating device, the flow rate of oxygen through a product is controlled by the difference between the reheating air temperatures of each of the heat exchangers and that of a reference heat exchanger, while the total quantity of reheating air is controlled by the difference between the reheating air temperature of each of the heat exchangers and a predetermined averaged temperature. CONSTITUTION:When the detected temperature of a thermosenser 46Aa is set at a reference value by a switch 48, it is inputted to temperature control devices 50Aa-50Bb as a signal 200. For example, when the reheating air temperature of the reversible heat exchanger 12Ba is detected by a thermosenser 46Ba according to a predetermined changeover valve switching cycle, the detected temperature is inputted to the temperature control device 50Ba. In this case, the difference between the temperature detected by the thermosenser 46Ba and the temperature (the reference value) detected by the thermosenser 46Aa is operated to thereby adjust an oxygen adjust valve 44Ba. Further, the temperature 54 of the reheating air 108A is inputted to a temperature control device 52 and the difference between the temperature 54 and the predetermined mean temperature 56 is operated to control adjust valves 32 and 36, to thereby adjust the total quantity of the reheating air. The above process is carried out on each of the heat exchangers in sequence periodically so that a stabilized temperature balance is maintained. |
