Problem of flow interruption in desulfurization slurry pump! Please help! ! !
Thread Content
Abnormality in the slurry supply pump for desulfurization in the power plant; the frequency of the variable-frequency pump remains unchanged, but the flow rate decreases until flow stops； Increasing the frequency for the operator is ineffective ； Inspection of the slurry tank at the pump inlet: No blockage at the pump inlet ； The outlet pipe is not blocked (the faulty pump is Pump B, which serves as a backup for Pumps A and C). It has been disassembled 5 times yet the cause has not been found; the motor and frequency converter have both been replaced (with those from Pump A), and there are no issues in either case. Has anyone who owns a universal jar encountered such a problem? I’m begging for help
Check the possible reasons for the cut-off of the slurry supply pump: 1. Check whether the pump impeller and the interior cavity of the pump are worn or contain foreign objects. 2. Check the pressure difference between the inlet and outlet of the slurry supply pump to determine if there is any pressure loss. 3. Verify whether the flow sensor is faulty or giving inaccurate readings. 4. Check the tubing for air leaks, especially in the inhalation tubing. 5. Verify that the pump’s NPSH (net positive suction head) is sufficient to prevent cavitation. 6. Check the overall operating condition of the desulfurization system to determine whether other pumps are affecting the operation of this pump. 7. Check the control system to ensure that commands are transmitted correctly. If the above checks do not resolve the issue, it may be necessary to enlist the help of professional pump repair technicians or the manufacturer’s technical support for on-site diagnosis. .
Is there a leak in the mechanical seal or the inlet pipe? Air has entered the pump body, causing air locking
When something goes wrong, there’s usually an underlying issue; replace the motor inverter and try swapping the pump as well……
Have considered it； There is no slurry leakage from the mechanical seal, and there are no issues with the cooling water for the mechanical seal (the pressure is quite high). There is also a drain pipe at the pump inlet, along with a drain valve; when this valve is opened, the pressure of the flushing water in the pump inlet pipeline is 0.5 MPa, and the drain valve does not leak (water is discharged to the ground). It started working again yesterday; after running for over an hour, the issue of data loss occurred once more. The head is too big. . . .
No, then we’ll replace the pump. . . . . . .
Have you checked the impeller area? Could it be that it isn’t secured properly, causing the motor to spin while the impeller doesn’t move?
Have the coupling keys and impeller keys been checked? Could it be that the coupling or the key on the impeller has come loose, resulting in the motor running at normal speed while the pump loses its rotation and its speed decreases?