| 摘要 |
<p>Disclosed are a method and a device for liquefying and separating air, the price of a device used when fluid products are collected can be reduced. The method for liquefying and separating air is comprised of a raw material air compressing process wherein a compressed raw material air having a first setup pressure higher than the operating pressure of an intermediate pressure tower is obtained by compressing the entire amount of a raw material air, an absorbing and purifying process wherein a compressed and purified air is obtained by removing impurities from the compressed raw material air, a circulation air confluence process wherein a circulation air is obtained by joining the compressed and purified air and a compression returned air together, a cooling process wherein an air to be introduced to the intermediate pressure tower is obtained by cooling a first branch current air obtained by dividing the circulation air into two branch currents, so as to have a first setup temperature, and an air to be expanded is obtained by cooling a second branch current air so as to have a second setup temperature higher than the first setup temperature, an expansion process wherein a low-temperature air is obtained by adiabatically expanding the air to be expanded so as to have a second setup pressure lower than the first setup pressure, a process for introducing a part of the low-temperature air to the intermediate pressure tower, a temperature increasing process wherein a returning air is obtained by returning the temperature of the remaining low-temperature air, a circulating and compressing process wherein a compressed returning air is obtained by compressing the returning air, and a process for introducing the air to be introduced to the intermediate pressure tower to the intermediate pressure tower.</p> |
