Why does the main catalytic fan have two vents?
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What is the purpose and principle behind setting it? I didn’t understand the technical Q&A
One is for venting during surge, and the other is a small vent for adjusting air volume
They are all called anti-surge valves. If there’s anything you don’t understand, don’t use the outlet vent to adjust the air volume! Use the inlet or blade angle
Have you checked the range of these two anti-surge control valves? If these two anti-surge valves are A and B, it is possible that valve A has a range of 0----50%, while valve B has a range of 50%-----100%; this can be confirmed through the logic of the safety system
The situation you are referring to applies to axial flow main fans, where the volume of air flow is adjusted by changing the angle of the stationary blades； The air volume regulation of the centrifugal main fan is achieved through the inlet flow rate
It’s basically in the form you described – it involves two circuits for step-controlled operation; here, however, it’s 0-50% and 40-100%
You’ve also added a cross-check for your profit sharing, hehe. It is mainly for protective purposes only; its effect is not very significant
Thank you. Is adjusting the air volume intended for centrifugal fans?
One is for self-protection by rapid venting, and the other is for adjusting surge, right? Is it okay to design it as just one row?
At the moment, one can only learn about it from books...
For the exhaust of our centrifugal main fan, there is a manual exhaust valve and an electric butterfly valve. The inlet butterfly valve is used to control the air volume. During normal operation, the two vent valves are closed