Online alkali concentration monitoring in chlorine absorption tower
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Chlorine is absorbed through two-stage alkali spray towers; what instruments are used to measure the concentration of the alkali solution online? The initial alkali concentration is 15-18%; experts say that online pH meters are not reliable, and cleaning them due to clogging is a time-consuming task.
An online densitometer or refractometer can be used to monitor the concentration of the alkaline solution. A densitometer estimates concentration values by measuring the density of the liquid, while a refractometer determines the alkali concentration by measuring the refractive index of the liquid. These two types of devices are generally more resistant to high concentrations and corrosivity in alkaline solutions than pH meters, and require less maintenance. .
……We’ve used pH meters before, and they weren’t good. A few days ago we consulted two manufacturers of online monitoring instruments that can measure the concentration of liquid alkali and the level of hypochlorite; one is based in Yantai, Shandong, and the other in Hunan. They seem to be decent, but the price is too high for small businesses – over 200,000 yuan per set, :)
When the initial alkali concentration is high, the optimal absorption rate is 1.733 mol/l; therefore, the alkali concentration in the solution can be slightly higher than this value. A high concentration causes severe corrosion of the absorption tower; does this improve the absorption efficiency?
You might want to take a look at online concentration analyzers that use ultrasound and conductivity methods. Maintenance-free, with a proven track record. Feel free to contact me if you need any information. 18615997765
It’s sufficient to measure the pH value; as long as the pH measurement system is properly designed, that’s enough. It’s normal for those selling instruments to try to deceive you – pH meters are quite cheap