Centrifugal compressor

airpneumaticstationary

Short description
Air separation compressors are used in large-scale air separation plants for the chemical and coal chemical industries. Shaangu air separation compressor trains cover capacities from 20,000 Nm³/h to 150,000 Nm³/h. Typical train configurations: internal compression — one air compressor plus one booster; external compression — a single air compressor.

Model code definition
Example: “EIZ90-4/EIZT125-3”. EIZ/EIZT — series code for centrifugal compressors with integrated built-in intercooler. 90/125 — size number, nominal diameter of the first-stage impeller (cm). 4/3 — number of impellers.

Characteristics of EIZ/EIZT compressors

• Serialized design and high-efficiency three-dimensional impellers. Built-in intercooler(s) reduce gas flow path length and resistance to enable near-isothermal operation.
• Compact built-in intercooler(s) provide effective noise reduction.
• Inlet guide vanes ensure a wide operating range (approx. 75%–105% of nominal) to reduce energy consumption.
• Built-in spraying system enables on-line cleaning of impellers and cooler tubes for long-term stable operation and minimized downtime.

Booster compressor families
Shaangu booster compressors include EZ/EBZ and EG series. EZ series: horizontal split structure with external interstage cooler. EBZ series: vertical split barrel structure with external interstage cooler. EG series: integrated gear-type compressors.

EG series highlights

• Flow rate up to 14,000 m³/min
• Discharge pressure up to 7.2 MPa
• Maximum speed > 35,000 r/min
• Variable efficiency > 88%

References
As of December 2019, nearly 270 Shaangu air separation compressor trains are in operation, representing over 80% of the domestic market share in large-scale air separation sectors.

Technical specifications

• Service range (air production capacity): 20,000 Nm³/h to 150,000 Nm³/h
• Common series used in air separation compressor trains: EIZ / EIZT (centrifugal compressors with built-in intercooler)
• Model code elements: size = nominal diameter of first-stage impeller (cm); suffix = number of impellers
• Typical train configuration: internal compression – one air compressor + one booster; external compression – single air compressor
• Booster series: EZ (horizontal split, external interstage cooler), EBZ (vertical split barrel, external interstage cooler), EG (integrated gear type)
• EG performance (typical maxima): flow up to 14,000 m³/min; discharge pressure up to 7.2 MPa; max speed > 35,000 r/min; variable efficiency > 88%
• Design features: built-in intercoolers for reduced flow path resistance and noise reduction; inlet guide vanes for wide operating range (75%–105%); built-in spraying system for on-line cleaning
• Field reference: ~270 sets in operation (Dec 2019)