Guide to the types of power compressors: centrifugal and axial.

Release time：2026-07-10    Click：6

In the core fields of industrial fluid transportation, energy generation, petrochemical industry, aerospace and so on, compressor is an indispensable core power equipment, which is mainly divided into two categories: positive displacement type and dynamic type. Among them, the power compressor (turbine compressor) has become the first choice equipment for large-scale industrial scenes with the advantages of continuous gas supply, large flow, high energy efficiency and stable operation. The core of power compressor is divided into two categories: centrifugal compressor and axial compressor, which have significant differences in working mechanism, structural characteristics and working condition adaptability, and are also the core points of equipment selection and operation and maintenance optimization. In this paper, the core principles, structural characteristics, advantages and disadvantages and applicable scenarios of two kinds of compressors are systematically disassembled, which provides reference for industrial equipment selection, working condition matching and daily operation and maintenance.

Guide to the types of power compressors: centrifugal and axial.

1. Overview of Power Compressor Core

Power compressor belongs to speed compression equipment, and its core working logic is different from piston and screw compressors. It does not compress the gas by changing the volume of the cavity, but relies on the impeller and blades rotating at high speed to do work on the gas, so as to improve the gas flow rate and kinetic energy, and then converts the kinetic energy into static pressure energy with high efficiency through the diffuser structure, and then realizes the purpose of gas pressurization and continuous transportation.

Compared with the positive displacement compressor, the dynamic compressor has the advantages of compact overall structure, low vibration and noise, less wearing parts, oil free compressor realization and meeting the needs of large-scale and continuous industrial production. According to the flow direction of gas inside the equipment, the core is divided into centrifugal compressor and axial compressor, and their performance boundaries and application scenarios are different.

2. Centrifugal compressor: Optimization of medium and high pressure working conditions with large flow rate.

1. Working principle

The core feature of centrifugal compressor is the radial flow of gas. When the equipment is running, the motor drives the impeller to rotate at high speed, and the gas enters the impeller from the axial direction, and is quickly thrown to the outer edge of the impeller under the action of centrifugal force, and the flow rate is greatly improved. The high-speed airflow then enters the diffuser structure, the cross section of the flow passage is gradually expanded, the gas velocity is decreased, and the kinetic energy is continuously converted into static pressure energy to complete the pressurization process. Multi-stage impeller and diffuser are connected in series, which can increase the gas pressure step by step to meet the demand of medium and high pressure gas supply, and then be discharged stably after being collected by volute.

2. Core structural features

The overall structure of centrifugal compressor is modular and highly integrated, and its core components include high-speed impeller, diffuser, volute, spindle, bearing and sealing system. The whole equipment is small in size and light in weight, and there is no need for huge foundation counterweight and frequent lubrication of internal parts except bearings, so that oil free compressor can be realized and gas medium pollution can be effectively avoided. At the same time, the exhaust is continuous and uniform, and there is no need to configure the interstage gas storage buffer device. The equipment layout is simple and the adaptability is extremely strong.

3. Analysis of advantages and disadvantages

Core advantages: first, the operation stability is extremely strong, the vibration is small, the noise is low, the continuous operation period is long, and the failure rate is low; Second, the sealing performance is excellent, and the oil free compressor characteristics can meet the needs of medicine, precision manufacturing and high-purity gas transportation; Third, the operation and maintenance cost is low, the wearing parts are few, the maintenance frequency is low, and the long-term operation economy is good; Fourth, the single equipment has a wide range of flow adaptation, which can meet the gas supply needs of medium and large industries.

Inherent short board: single-stage compression pressure is relatively low, and multi-stage series structure is needed for high-pressure working conditions. The more equipment levels, the higher the structural complexity and cost of the whole machine; Under the condition of small flow rate, the operation efficiency is greatly reduced, which is prone to surge and the adjustment range of working condition is limited, so it is not suitable for the fine scene of small flow rate and high pressure.

4. Typical application scenarios

Centrifugal compressor is suitable for stable flow, medium-high pressure and medium-large flow, which is widely used in petrochemical catalytic cracking, natural gas pressurization transportation, industrial large-scale air compressor station, metallurgical gas transportation and other fields. It is the core equipment for large-scale gas supply in traditional heavy industry and general industry.

3. Axial compressor: high-efficiency equipment with super-large flow and low pressure ratio.

1. Working principle

The core feature of axial compressor is that the gas flows in parallel with the axial direction, and the gas flow direction is consistent with the main shaft of the equipment, without radial deflection. The inside of the equipment consists of a plurality of groups of alternating rotating blades and stationary guide blades, gas enters at a uniform speed along the axial direction, and the rotating blades rotate at a high speed to do work on the gas, thus improving the kinetic energy of the gas; Then the airflow enters the stationary guide vane, and the expansion of the flow passage realizes the conversion of kinetic energy into static pressure energy, and at the same time, the airflow direction is regulated to prepare for the next stage of compression. Multi-stage cascade structure supercharges step by step to realize continuous and stable compression of large flow gas.

2. Core structural features

Axial-flow compressor has large cross-section and small airflow resistance, and its gas handling capacity per unit area far exceeds that of centrifugal compressor. On the premise of the same gas handling capacity, the axial compressor has smaller radial size, lighter overall weight and compact axial layout, which is suitable for the integration of large complete sets of equipment. However, the blade profile of the equipment is precise and complex, which requires extremely high installation accuracy, a large number of blades and dense internal structure, and it is difficult to overhaul and disassemble.

3. Analysis of advantages and disadvantages

Core advantages: first, the flow capacity is extremely strong, and the operation efficiency is far higher than that of centrifugal compressor under super-large flow condition, so it is a compression equipment with high energy efficiency under high flow and low pressure condition; Second, the airflow loss is small, the work efficiency is high, and the energy efficiency ratio under full load condition is excellent; Third, the radial size of the whole machine is small, which is suitable for the layout of compact complete sets of units.

Inherent short board: the single-stage pressure ratio is extremely low, and the high-pressure working condition cannot be independently adapted, and the multi-stage supercharging effect is limited; The stable working condition range is narrow, the efficiency drops sharply after deviating from the rated working condition, and the ability to resist load fluctuation is weak; The manufacturing and maintenance costs of precision blades are high, and the requirements for operating conditions and medium cleanliness are strict, and the operation and maintenance threshold is much higher than that of centrifugal compressors.

4. Typical application scenarios

Axial-flow compressor mainly focuses on the scenes of super-large flow rate, low pressure ratio and stable working conditions. Its core applications are high-end complete sets of equipment such as aero-jet engine, gas turbine power system, large blast furnace blast, flue gas desulfurization and denitrification in power plant, large ventilation and gas transmission, and large energy metallurgy fields, and it is not suitable for working conditions with high pressure demand and large flow fluctuation.

Centrifugal compressor has the advantages of wide working conditions, stable operation, convenient operation and maintenance, and strong adaptability to medium and high pressure, and is the mainstream selection of general industry; Axial compressor is the core configuration of high-end large-scale power equipment, which is superior to super-large flow, high energy efficiency at full load and compact structure.

The above is an introduction to "Guide to the Type of Power Compressor: Centrifugal Compressor and Axial Compressor". As the two core categories of power compressor, centrifugal compressor and axial compressor have no differences in advantages and disadvantages, but only differences in working conditions. In the selection of industrial equipment, it is necessary to combine the comprehensive considerations of field flow, pressure, load stability, installation space and operation and maintenance costs to accurately match the compressor type, which can not only ensure the stable and energy-efficient operation of the production system, but also effectively reduce the equipment procurement and long-term operation and maintenance costs and give full play to the performance value of the equipment.