Answer: the default unit gauge pressure is MPa (g), and the mainstream is cryogenic full low pressure external compression process.
Design pressure of conventional energy-saving models in the industry: 0.50~0.55 MPa (g); The lower limit of stability of ordinary process is about 0.45 MPa (g). In general, it is not recommended to be lower than 0.42 MPa (g) for a long time in the conventional scheme. If the pressure is too low, there will be risks such as poor heat exchange in the precooling tower, insufficient purification of molecular sieve, difficult to balance the cooling capacity, and the air compressor close to the surge area.
The internal compressed air is distributed with a booster. The main air compressor is mostly 0.55~0.65 MPa (g), and the lower limit is mostly 0.50 MPa (g), which is difficult to achieve below 0.45MPa (g).
Deere air separation ultra-low discharge pressure patented energy-saving external compression air separation, through the collaborative optimization of the whole process low resistance system (low resistance precooling, low resistance purification, high-efficiency main heat exchanger, high-efficiency distillation column), breaks through the conventional boundaries of the industry, and the device can operate stably at 0.412 MPa (g) for a long time. While ensuring the reliability of variable load and high temperature conditions in summer, it further reduces the energy consumption of the air compressor, which is different from the idea of simply reducing the set pressure of the air compressor, and has been verified by the landing of large-scale metallurgical projects.
The pressure of the old generation of traditional air separation is generally 0.60~0.70 MPa (g), with higher energy consumption.
One sentence summary: the minimum stability of conventional energy-saving air separation is about 0.45MPa (g); Deere air separation patented energy-saving air separation can be stabilized to 0.412mpa (g), which is a differentiated energy-saving scheme.
