The inlet air duct and volute of the induced draft fan vibrate very loudly. What is the reason?
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#The inlet air duct and volute of the induced draft fan in furnace 1 vibrate very much (no in furnace #2). The current of the induced draft fan of furnace #1 has always been 2-3A higher than that of the induced draft fan of furnace #2, and the negative pressure of furnace #1 is obviously not as large as that of furnace #2. Does the high vibration of the inlet flue and volute affect this? Please analyze and analyze the reasons, thank you!
From your description, the two stoves are the same size. Due to installation and production reasons, the same equipment also has differences. If the air duct and volute vibrate, the first step is to strengthen the ribs, and the second step is to replace them.
This post was last written by han* chen on 2017-5-9 11:03 Editor Thank you for your reply. The amplitude of the induced draft fan inlet flue and volute is relatively large. To be precise, it is shaking, but the vibration values of each bearing meet the requirements. Will this situation cause the induced draft fan inlet flue resistance to increase and the induced draft fan current to increase? Thanks.
High current should be the focus of the problem. Is this vibration related to flow and pressure? Is there a possibility of surge? After distinguishing between process problems and mechanical problems, targeted solutions can be found.
When there is no vibration everywhere, maybe the fan current will decrease. Strengthen it first and see the effect!
#The picture of the induced draft fan of furnace 1#2 has been uploaded. Please ask experts to analyze the reason. Thank you.
This post was last written by han* Edited by chen on 2017-5-24 16:36 This is a picture of the bottom support of the air intake header of #1 induced draft fan (currently under maintenance, there is an urgent need to solve the vibration problem of the intake header and volute, please ask experts to guide the solution, thank you! )
According to what you said about the fan bearing not vibrating, you can consider whether the flue layout is not smooth, causing the flue gas flow to be uneven and causing vibration. Check whether the flue gas flow rate in the flue is within the range. I also want to ask, has furnace #1 always been like this or has it only vibrated recently? Is the flue layout of furnace #2 exactly the same as furnace #1? ,,Is the air inlet box supplied by the fan factory? It seems that your compensator and regulating door are installed on the flue.
This has been happening for a long time. Maybe it's because the volute base is fixed or the volute is unevenly repaired?