System for preventing reverse rotation of large-sized centrifugal compressor

Abstract

The invention relates to a system for preventing reverse rotation of a large-sized centrifugal compressor. The system comprises a fresh air compression segment, a circulating air compression segment, a desynthesis process segment, and an anti-surge loop. A pressure balance line is disposed between an outlet of a fresh air separator in the fresh air compression segment and an outlet of a circulating air separator in the circulation air compression segment, and a vent valve is disposed in the pressure balance line. During staggering, the vent valve is opened by interlocking to balance pressure of an inner access hole of a unit. Therefore, the problem that a compressor rotor reversely rotates when the large-sized centrifugal compressor stops is solved effectively.

Description

technical field [0001] The invention belongs to the technical field of preventing reversal of large centrifugal compressors, and in particular relates to a system for preventing reversal of large centrifugal compressors. Background technique [0002] A centrifugal compressor is a type of vane rotary compressor. In the centrifugal compressor, the high-speed rotating impeller imparts centrifugal force to the gas, and the diffuser effect imparts to the gas in the diffuser channel, so that the gas pressure is increased. In the early days, this kind of compressor was not noticed because it was only suitable for low and medium pressure and large flow occasions. Due to the development of the chemical industry and the establishment of various large chemical plants and refineries, centrifugal compressors have become key machines for compressing and transporting various gases in chemical production, and occupy an extremely important position. [0003] In the coal-to-methanol process...

AI Technical Summary

Problems solved by technology

[0005] 1. It will damage the lubricating oil desert and damage the bearing during the idling process of the unit shutdown;

[0006] 2. The unit reverses instantaneously, and there is a huge torsional stress on the rotor, which seriously endangers the safety of the rotor;

[0007] 3. At the same time, the reverse rotation of the rotor will also damage the dry gas seal of the compressor;

[0008] 4. The reverse rotation of the compressor affects the safety of the front and rear sections

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