FIELD: technological processes.
SUBSTANCE: invention relates to production of compressed gas product (72; 73) by means of low-temperature air separation in the system of distillation columns, which has high pressure column (21) and low-pressure column (22). All used air is compressed in main air compressor (2). First partial flow (8, 11, 14) of compressed used air (7) is cooled in the main heat exchanger (13), discharged in the first air turbine (15) and introduced (40, 18, 19, 20) into the system of distillation columns. Second partial flow (12, 27, 29, 30) of compressed used air is compressed in the first booster compressor (9), cooled in the main heat exchanger (13), discharged (31) and introduced into the system of distillation columns. First product stream (69; 75) is extracted in liquid form from the system of distillation columns, compressed, in the main heat exchanger (13) evaporated and heated. In the first mode of operation, the first quantity of the first product of compressed gas is obtained, and in the second operating mode the second quantity is obtained. In the first operating mode the first amount of discharged air (65, 66) is compressed in compressor (2), and in the second mode of operation in compressor (2) the second larger quantity of the second working flow (65) is compressed.
EFFECT: providing low specific energy consumption in a wide range of loads.
10 cl, 4 dwg
