Unstable pressure at the pump outlet of the chlorate decomposition tank
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Our pump is used in chlorate decomposition tanks, and there is a constant issue of unstable pressure at the pump’s outlet – once the outlet is set to its maximum setting, no pressure is left. Is this caused by cavitation? How can this problem be resolved, either with the pump or the piping?
Could you tell me the material of your chlorate decomposition tank? What is the material of the pump? Selection of pump inlet and outlet valves? This makes it easier to analyze the specific reasons.
It may be different from our process; our chlorate decomposition tanks all use natural overflow, without pumps
What I want to know is whether the pressure gauge is before or after the pump’s outlet valve. This is important.
It is due to an insufficient reaction time after adding hydrochloric acid
Our factory started out the same way; we used pumps from Xi’an Pump Valve, model CZX100-200. There were fluctuations in the outlet pressure, but this was not related to the pumps themselves – it was caused by vaporization of the liquid. After that, the problem disappeared, and we set the outlet pressure at a lower level
Obvious cavitation phenomenon; after adding hydrochloric acid, the reaction time was insufficient, resulting in cavitation. Baffle plates can be added to the decomposition tank.
The reaction time is insufficient, preventing the gas from being released; when the liquid reaches the vicinity of the impeller, the pressure drops instantly, which causes the gas to be released
Extend the reaction time and add a buffer tank.
If conditions permit, switch to a larger decomposition tank
As analyzed above, this problem arises because the acid added to the decomposition tank fails to completely remove the chlorine from the brackish water; once it enters the pump and rapid mixing takes place, chlorine is generated, leading to gas entrapment and as a result the pump can no longer deliver fluid. Solution: Even if a larger decomposition tank is used, aside from whether it can resolve this issue, the cost involved would also be considerable. I suggest the poster use a slightly larger buffer tank, with exhaust pipes at the top of the tank. Then using a pump might solve it.