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Centrifugal Compressors
Centrifugal Compressors
Roots compressors
Roots fan is a volumetric fan, a certain volume of gas is first sucked into the cylinder. The volume of the gas is forced to be reduced in the cylinder, the gas molecules are close to each other, the density of the gas per unit volume increases, the pressure rises, and when a certain pressure is reached, the gas is forced to wander out of the cylinder.
Centrifugal Compressors
It is the machinery that relies on the input mechanical energy to raise the gas pressure and discharge the gas, and it is a kind of driven fluid machinery. The increase of gas pressure is converted from the speed of the gas, i.e., the airflow of the suction is first made to obtain a certain high speed, and then it is slowed down, and its momentum is converted into the increase of gas pressure, and then discharged.
Comparison of two types of compressors
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Centrifugal Compressor |
Roots compressors |
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Principle |
Vane type |
Volumetric |
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Operating noise |
High frequency noise, 75 decibels |
Low-frequency noise, less than 85 dB after adding a silencing room |
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Advantages |
Large production capacity, uniform air output; small footprint, simple structure |
High efficiency, high compression ratio, low requirements for the stability of the inlet pressure, no wheezing phenomenon |
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Disadvantages |
susceptible to wheezing, high requirement for system balance, high speed with certain danger |
Bulky body, high vibration |
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Investment Costs |
High, about 30% higher compared to Roots compressors |
Low |
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Operating Costs |
Low |
5%-8% higher compared to centrifugal compressor |
| Maintenance Costs | High replacement cost |
Low maintenance cost |
Centrifugal Compressors
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