Samsung brand third-stage centrifugal compressor
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I. Self-cleaning air filter for centrifugal compressors 1. What does it mainly filter out from the air? 2. How is a self-cleaning filter backblown? II. How do centrifugal compressors prevent surging? Can preventing surge in the unit be achieved by connecting a pipeline between the unit’s outlet and inlet (with a gate valve installed in the pipeline)?
1. Self-cleaning filters mainly filter dust and mechanical impurities from the air. 2. The self-cleaning filter uses purified compressed air to perform automatic, timed backwashing. There are 100 filter cartridges in total, with 5 cartridges per group; thus, there are 20 groups in total, and each group is equipped with an automatic control valve. The backflow time can be adjusted according to the level of resistance. What the original poster means is to add something equivalent to a return pipe (for anti-surge protection), but this is not necessary. The outlet should already be equipped with anti-surge valves, vent valves, and even safety valves. Adding another reflux line is a bit redundant.
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An air filter primarily filters dust in the air, particles larger than 1um; it is recommended that its filtration efficiency be at least 99.5%. The backflow air source is mainly purified air or other clean air sources, with a pressure greater than 4 bar. The backwashing width and interval time are controlled via solenoid valves (pulse valves) and an on-site PLC controller. The anti-surge valves of centrifugal compressors come in two types: venting and backflow; what you mentioned, where the outlet returns to the inlet, is the backflow type.
Air reflux is not very useful; generally, it is simply vented, while the oxygen compressor can be used for reflux.
Generally, for air compressors used in import applications, it is sufficient to filter out impurities larger than 2 microns (provided that the area is not near the sea or there are no special chemical factories in the vicinity). Currently, the main types of filters used are self-cleaning filters and plate filters; self-cleaning filters can be replaced while the unit is still in operation, whereas plate filters offer better filtering performance but cannot be replaced while the unit is running； The backwashing of self-cleaning filters relies primarily on their built-in control systems and instrument air supply; generally, the backwashing time is set by the manufacturer of the self-cleaning filter ； Surge in centrifugal compressors is basically caused by an abnormally high back pressure, too small an opening of the inlet valve, or surge between stages of the unit. It is usually handled by using an exhaust valve; installing a return valve is not generally recommended, as it is used infrequently and poses certain risks. Moreover, the exhaust valve does not result in much waste of gas.