
Centrifugal Feed Air Compressor
Introduction
The working principle of the centrifugal raw air compressor is based on the velocity-type compression principle. It imparts kinetic energy to the gas through a high-speed rotating impeller, then converts this kinetic energy into pressure energy in fixed components, achieving continuous air compression. The core process can be divided into three stages:
1. Inhalation and Acceleration: Air enters the compressor through the intake pipe and is drawn into the center of the high-speed rotating impeller. Under the influence of centrifugal force, the air is flung radially outward along the impeller while achieving extremely high velocity, with both its kinetic and pressure energy increasing simultaneously during this process.
2. Kinetic energy is converted into pressure energy: The high-speed flowing air exits the impeller and enters the diffuser. The flow passage cross-sectional area of the diffuser gradually increases, forcing the airflow to decelerate. According to fluid mechanics principles, the reduction in airflow velocity converts its kinetic energy into pressure energy, significantly increasing the air pressure.
3. Continuous compression and output: After being pressurized by a diffuser, the air is usually guided to the next stage impeller for further compression through bends and reflux devices (in multi-stage compressors) to achieve the desired final pressure. Finally, high-pressure air is discharged through the exhaust pipe for subsequent process use. The entire process relies on the continuous rotation of the impeller to achieve continuous and uniform suction and discharge of air.

Parameter
Oxygen
|
Exhaust pressure (absolute pressure) |
intake flow |
shaft power |
Isothermal efficiency |
speed |
compression level |
Load regulation range |
|
0.45 – 0.85 MPa(A) |
100,000 – 800,000 Nm³/h |
10,000 – 60,000 kW |
≥ 72% – 78% |
3,000 – 10,000+ rpm |
Level 3-5 |
70% – 105% |
(For Reference Only)
Main application areas
Steel metallurgy
Providing power for large-scale air separation supporting steel mills, meeting the high demand for oxygen and nitrogen in processes such as blast furnace oxygen enrichment and converter steelmaking.
Coal chemical industry
To provide raw air for the super large air separation system supporting coal gasification projects, it is required that the equipment can operate stably for a long time to match the gasification furnace cycle.
Petrochemical and fertilizer
In large-scale chemical projects such as synthetic ammonia, methanol, ethylene, etc., stable gas sources are provided for air separation units to produce the required nitrogen, oxygen, etc.
Nonferrous metal smelting
Applied to the oxygen rich smelting process of copper, lead, zinc, etc., providing continuous power for supporting air separation.
Main features and advantages
High operating efficiency
Under medium to high exhaust pressure and high flow conditions, its isothermal efficiency usually performs well, which helps to control the main energy consumption of the entire air separation unit.
Good stability
The structure is relatively simple, suitable for long-term continuous operation, with minimal vibration and a long maintenance cycle, which helps to ensure the stability of backend air separation production.
Large processing capacity
A single machine can meet a very large air processing capacity, which can match the modern industrial demand for large-scale oxygen and nitrogen production.
Clean output gas
Through mature technological means, the oil content in compressed air can be effectively controlled, protecting downstream expensive molecular sieves and low-temperature equipment.
Relatively flexible adjustment
With the help of imported guide vanes or variable frequency speed regulation, the air volume can be adjusted within a certain range to adapt to changes in some production loads.
Relatively easy maintenance
Daily maintenance work is not as frequent as reciprocating compressors, and the comprehensive maintenance cost throughout the entire lifecycle may have certain advantages.
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