Polymer feeding
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May I ask: Is the accuracy of dosing dispersants and initiators using flow meters high (mainly via DCS control)? What is a suitable dosing rate in cubic meters per hour? Does it speed up the stabilization of the dispersion system?
It depends on that type of flow meter; the tuning time needs to be extended
We use flow meters for all our additives, but they have dual detection
An elliptical gear flow meter can be used, and the flow rate depends on the actual feeding conditions
Our unit also uses dual flow meters, one for dosing and one for calibration
The accuracy is definitely high. The initiator is measured using a scale (automatically), while the dispersant is controlled by a flow meter; the pumps are used in a linked manner, and our factory has achieved good results using this approach.
Two mass flow meters are used, one for measurement and one for calibration; any significant errors are addressed promptly
The initiator and dispersant are both measured using a weighing scale. It’s convenient to stop the program promptly if inaccurate measurement is detected.
The accuracy of flow meters is lower than that of weighing scales, but the investment required is less. In the case of cold water as the feed material and the use of metered ion-free water for rinsing, it is necessary to ensure that the feeding and rinsing processes for dispersants and initiators are completed before the supply of ion-free water ends, leaving a certain margin. If hot water is used as the feed material or if separate metered amounts of ion-free water are used for rinsing the feed pipes, it mainly depends on the operating flow rate of the feed pump and the range of the flow meter; the feed flow rate should not be less than 20% of the full range of the flow meter. Increasing the speed has no impact on the stability of the dispersion system.
The monomer and water are measured using dual mass flow meters
Our factory also uses dual mass flow meters, one for measurement and another for calibration; no major problems have occurred