Is the configuration of the air duct reasonable?
Thread Content
The flow chart of the two fans in the workshop is as shown above. Fan 1# is directly connected to the motor, with an air volume of 5000m3/h.； Fan 2# is belt-driven, with an air volume of 15000m3/h, and the outlet air pressure of both units is 3000Pa. ； Both motors are 15kw. Now the 1# motor is burned out. After the machine repairman removed the fan and motor, the wind coming from the outlet pipe of the 1# fan is very strong. Therefore, it is suspected that the 1# fan outlet and the 2# fan outlet are connected together. The outlet of the 1# fan goes up to the second floor platform (about 3 meters), passes through the condenser, and then passes through a straight pipe of about 10 meters. It turns for more than 3 meters and is connected to the outlet of the 2# fan. The resistance of the whole process is relatively large (glass fiber reinforced plastic circular pipe), resulting in a relatively low pressure when the 1# fan blows air to the outlet of the 2# fan, and the wind from the 1# fan cannot enter the spray tower. Is this the reason why the #1 fan motor is burned out? I don’t think so. If fan #1 is not blowing air (equivalent to an outlet flow of 0), then the motor power is the minimum. How can the motor burn out if the motor power is minimum? Could it be that the wind has been circulating in the casing, causing the temperature to rise and burning out the motor? All sea friends can express their opinions and analyze the specific reasons, or if there are those who understand the process piping, they can analyze whether this piping is reasonable or not. Is it feasible to transform the outlet of fan 1 to the inlet of fan 2? Chemical Equipment and Machinery
If two fans are used at the same time, the 1# fan is not blowing air. Although the outlet flow is equivalent to 0, it is always running. If it is running and cannot deliver materials and heat, it will burn.
Whether to increase the diameter of the pipe after the two fans are combined?
No, it is directly connected to the 2# fan outlet. The pipe diameter is the 2# fan outlet pipe diameter.
It stands to reason that if two machines are started at the same time, the pipe diameter should be increased after their outlets are merged.
Because there is a large pressure loss difference between the outlet pipes of fans 1# and 2, when the two fans are working at the same time, the medium in the fan pipe #2 is filled with the outlet pipe of the fan #1, and the outlet of the fan #1 is in a suffocated state, causing the fan to surge! Due to strong vibration, the bearing liquid lubrication conditions will be destroyed, the bearing bushes will be burned, the rotor and the stator will have friction and collision, and the sealing elements will be destroyed. Has there been any surge phenomenon at your #1 fan site? In addition, the fans are connected in parallel to increase the flow, and the fans are connected in series to increase the wind pressure. Therefore, the 1# outlet is connected in series to the 2# inlet. This method may not be feasible. Therefore, it is recommended that the two fan pipelines enter the spray tower independently. Personal opinion, hope you can correct me.
It is better for the two fan pipes to enter the spray tower independently. I agree with the opinion above.
It is better for the two fan pipes to enter the spray tower independently. I agree with the opinion above.
Why not share one fan for two air ducts, change the frequency adjustment pipe, install a valve, and install a micro-pressure gauge on the pipe?