Flow meter for saltwater with NaOH and soda ash
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During the brine purification process, were flow meters used when adding alkali and soda ash? Previously, we used rotameter flow meters, but they couldn’t withstand corrosion and ended up short-circuiting. Currently, adjusting the flow rate by feel seems to work fine. I wonder what type of flow meters the manufacturers are using. Are they corrosion-resistant?
An electromagnetic flow meter will do; it offers high accuracy, isn’t very expensive, and requires little maintenance. Electromagnetic flowmeters are widely used in the ion-exchange membrane caustic soda industry, with very good results.
Our company uses only electromagnetic flow meters; rotameter flow meters are prone to clogging, right?
We also use electromagnetic flow meters; their interiors are lined with PTFE
The OP’s factory seems to be quite old; nowadays, new installations all use electromagnetic flow meters. You’re behind the times!
Flow meters are definitely available, and they are all electromagnetic flow meters. No problem, you can use a metering flow meter instead
If only a small amount is added, and the pipes are relatively small, it may not be necessary to use them. Our factory doesn’t use them for caustic soda; for soda ash, we also use electromagnetic flow meters
In our plant, no flow meters are used for caustic soda; instead, the flow rate is controlled through interlocks linked to pH meters. For soda ash, electromagnetic flow meters are employed, which work quite well. In fact, in the old industrial park, a rotameter was used as a flow meter for caustic soda; however, it frequently got clogged and was eventually removed. It should be noted that flow control relies on pH values; additionally, the amount of alkali present has been analyzed to calibrate the pH meters
It means adjusting the amount of caustic soda added based on the pH
With an electromagnetic flowmeter, the measurement accuracy can be quite high, provided that the process parameters you provide initially are accurate
How long have you been using pH control to determine the amount of alkali to add? Is it reliable? What does a pH meter look like? What brand is it? Where should it be installed? I’ve heard that the difficulty with this control method lies in the detection!