Anti-surge Measures of Centrifugal Fan
Release time:
2020-09-25
Centrifugal fan anti-surge measures: 1) The selection of centrifugal fan should be in the effective area. Do not artificially arbitrarily increase the selection coefficient, so that the fan in operation, the actual fan flow is much higher than the design fan flow. When using a large number of throttling, it is easy to adjust the fan to work in the surge area. Therefore, in the design and selection of the fan, it is necessary to avoid the working condition range approaching the surge zone. If the box-type fan surges, check whether the air duct interface is deformed. 2) Once the centrifugal fan surges during system operation, the operating range of the working condition can be adjusted by changing the rotating speed of the fan, and the installation angle of the moving blade can also be changed. These methods can move the performance curve of the fan to the small flow area, and then the surge critical line also moves to the small flow area accordingly, thus expanding the stable operating range of the fan. 3) Because some workplaces do not have the above adjustment conditions, can not stop the production, but there is a simple and quick adjustment method can eliminate the surge, is to add a bleed valve. Make qv = qv and put qv surge> qvmin, and the surge can be eliminated immediately. It is pointed out that the gas put into the atmosphere should be harmless, and if it is harmful, it should be introduced into the inlet pipe of the ventilator by a small pipe.
Centrifugal fan anti-surge measures:
1) The selection of centrifugal fan should be in the effective area.
Do not artificially arbitrarily increase the selection coefficient, so that the fan in operation, the actual fan flow is much higher than the design fan flow.
When using a large number of throttling, it is easy to adjust the fan to work in the surge area.
Therefore, in the design and selection of the fan, it is necessary to avoid the working condition range approaching the surge zone.
If the box-type fan surges, check whether the air duct interface is deformed.
2) Once the centrifugal fan surges during system operation, the operating range of the working condition can be adjusted by changing the rotating speed of the fan, and the installation angle of the moving blade can also be changed. These methods can move the performance curve of the fan to the small flow area, and then the surge critical line also moves to the small flow area accordingly, thus expanding the stable operating range of the fan.
3) Because some workplaces do not have the above adjustment conditions, can not stop the production, but there is a simple and quick adjustment method can eliminate the surge, is to add a bleed valve. Make qv = qv and put qv surge> qvmin, and the surge can be eliminated immediately.
It is pointed out that the gas put into the atmosphere should be harmless, and if it is harmful, it should be introduced into the inlet pipe of the ventilator by a small pipe.
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