Fan overcurrent
Thread Content
The blower is designed with an inlet pressure of 0.1 Kpa, and the pressure is increased to 30 Kpa. After it starts operating, the valve cannot be opened further; doing so would cause an overcurrent (no flow meter is installed, so it’s not possible to determine the flow rate). On-site inspection revealed that the rise height of the fan’s outlet pipe has exceeded 10 meters. Could experts please help determine whether this is the main cause of the overcurrent? That is, the designed boost value is insufficient.
Are there pressure gauges at the inlet and outlet, and what are the readings?
If the motor is too small, the power of the centrifugal fan is related to the flow rate; the power is highest when the valve is fully open and lowest when it is fully closed, with no relation to the outlet pressure. If the current is too high when this valve is opened, it means the motor chosen is too small
The inlet short section was removed; the outlet pressure was 30 KPA. At this pressure, the opening degree of the outlet valve was very small, so the current did not exceed the limit. When the valve opening was increased, the current exceeded the limit.
If it is a fully customized set of equipment purchased from the market, it is the equipment manufacturer who must handle the resolution of any issues. If it is equipment that has been modified oneself, the gas flow rate corresponding to each customized current value should be set as the maximum flow rate, with the adjustment range kept below that value. Then check the user feedback to see if it is usable. Then decide whether to carry out the next improvement.
Both the drum and the induced draft fan are axial flow fans; don’t they all use the inlet to regulate flow? Try controlling it with the inlet valve – keep the inlet valve slightly open at startup and the outlet valve fully open
It seems that the motor chosen is too small; it’s like using a weak horse to pull a heavy load
High current, high workload. If there is sufficient airflow, reduce the inlet valve.
What I want to know is this: if the pressure is increased by 30 KPA, based on the head capacity of the water pump, water can generally only be lifted to a height of 3 meters. Since a fan is being used now, can it be assumed that gas can also only be raised to a height of 3 meters? Currently, the goal is to lift the gas to a height of 10 meters, and this is the main reason for the excessive current consumption by the fan.
What type of blower do you have? Send a picture to show me
If the fan selected is too small, just replace it with a larger model