Issues with current and pressure of the double-suction pump, as well as the amount of acid added
Thread Content
Situation description: The current used by the secondary suction pump was 135, with an acid injection pressure of 292. Currently, the current has suddenly dropped to around 110, while the acid injection pressure remains at 292 (no change). After restarting the pump, the current increased from 110 to around 130, again with an acid injection pressure of 292 (no change). There is concern that the pump’s performance is insufficient, resulting in inadequate acid injection and poor absorption; this could lead to smoke emission from the exhaust gases. However, no change in the acid injection volume can be detected from the pressure readings. Personally, I think it might have been due to a blockage earlier, which caused the current to be 135; now that the pipes or acid distribution system is unobstructed, the current has decreased. Please help analyze it, analyze it
The problem might be with the pump itself; there’s a chance to lift the pump and check it.
If the amount of liquid applied is insufficient, the current will definitely be a bit lower.
Is there any foreign object in the circulation tank? This issue has occurred several times: foreign objects have accumulated around the acid pump cage, causing a drop in current; normal operation is restored after restarting.
It is very likely that there is a problem with the suction inlet of the submersible pump; it’s necessary to analyze in detail whether there are any changes in the pump’s vibration and temperature, as well as whether there are any variations in voltage
The suction inlet of the pump is the most likely to get blocked; pumps generally do not break down easily.
First, verify whether the current measurement is accurate, whether the pressure gauge is accurate, and whether there is a significant difference in acid temperature before and after. The same is true if the pump has not undergone any treatment; consider changes in the fluid conditions at the pump inlet, variations in the pump’s operational stability, changes in air pressure, and the impact of human operation. Are acid chillers available for export?
First, verify the accuracy of the electrical and instrumentation data, then conduct analyses on the pump and pipelines separately
The flow rate variation of the pump can be determined not only by the current level of the acid pump but also by the temperature difference between the acid temperatures at the inlet and outlet of the absorption tower, as well as the temperature differences of the inlet and outlet gases.
1. It is possible to observe for another week or two to see if the current level drops again, and also to check whether the temperature of the acid gradually rises. If this happens, it is very likely that there is corrosion inside the pump – we have encountered such situations before. 2. Another possibility is that the acid distributor is clogged with acid sludge (applicable to tubular acid distributors). The impeller of the pump is clogged with acidic sludge, blocking the filter screen. :handshake
The current decreases while the outlet pressure remains unchanged; 1. It’s possible that the ammeter and pressure gauge are inaccurate. 2. There’s a slight blockage; once the pump stops, the stuff causing the blockage gets pushed to other areas, and this problem reoccurs after some time.