The current of the vertical high-speed pump fluctuates violently
Thread Content
Today, an upright high-speed pump was used to feed lean amine solution into the desulfurization tower. The pressure in the tower was 4.4 MPa, while the pressure in the lean amine solution tank was 0.4 MPa. The reflux valve of the pump was set to around 50%, but it seems that there should be an additional ten valve positions open at the site; all the outlet valves were closed. When the pump motor was started, the outlet pressure reached a maximum of 10 MPa. After opening the outlet valves, the current began to fluctuate severely after about five minutes, and the outlet pipeline started vibrating. I’m not sure what’s causing this situation.
Does the outlet pressure also fluctuate sharply when it shakes? It’s very similar to the situation where cavitation prevents an adequate flow rate
It seems that the outlet pressure is also fluctuating, but the inlet pressure is 0.4 MPa. What are the possible causes of cavitation?
Has there been any change in the solubility of the lean solution? Has the inlet temperature changed?
Is it because the inlet tank has a small volume, causing evacuation due to the vaporization of the medium?
The analysis showed a concentration of 1.3%, while the concentration inside the plant area was 31%. Normally, this kind of situation does not occur when water is used as the medium in the pump; however, it happened this time. I initially suspect that too little backflow is the cause of the cavitation phenomenon.
High-speed pumps generally have this problem: when the inlet pressure is low and the outlet pressure is high, the pump is forced to operate at a higher speed, yet the flow rate remains low, which makes cavitation more likely to occur. By comparing the actual operating conditions with the design specifications, it is possible to identify any discrepancies. A fairly effective solution is to reduce the temperature