Fusheng's American factory - Elliott, established in 1898, is the world's largest factory with centrifugal air compressors.
The structure of "centrifugal" is a generalist, such as centrifugal pump, centrifugal fan, centrifugal blower, etc. The similarity of these structures is that they all have an impeller (blade) and a volute.
Centrifugal compressors are used to compress other gases, such as syngas, cracked gas, carbon dioxide, etc. Some gas compressors are different in structure, so I won't discuss them here.
Centrifugal compressors are divided into three structures according to the structure and transmission mode: horizontal split type, vertical split type (also known as cylinder type) and isothermal type. The first two refer to the cylinder split method on the structure, and the latter The main difference between the two is the use of interstage cooling, most of which are multi-axis structures.
• The cylinder of horizontal split type is split into upper and lower parts, which are fastened with bolts and easy to disassemble. Generally used for low and medium pressure air compressors, not suitable for high pressure and oxygen-rich gas with small molecular weight. Most single-stage centrifugal air compressors are of this structure.
Centrifuges offer the following benefits:
①Large production capacity and uniform air supply;
②Compared with the piston machine, the structure is simple and compact, the floor area is small, and the civil construction investment is less;
③ Fewer wearing parts, easy maintenance and reliable operation. In particular, the continuous operation cycle is long, and the workload of operation and maintenance is less;
④ There is no contact friction between the rotor and the stator except the bearing and the shaft end seal;
⑤ No lubrication (no oil) in the cylinder is required for a wide range of applications.
Main disadvantages of centrifuges:
①Comparison rate is only available when working under the design conditions, the efficiency will drop away from the design conditions, and the ability to change working conditions will be poor;
②The single-stage pressure ratio is low, and it is not easy to obtain a small flow rate at the same time as the high pressure ratio. This is mainly because the flow rate is small and the airflow channel is narrowed, so the manufacturing process is difficult, the flow loss of compressed air is large, and the efficiency is very low;
③ The adaptability of the operation is relatively poor, and the properties of the gas have a great influence on the operation performance.
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