How can one exercise self-control in such a situation? Urgent! Urgent! Urgent! ! ! !
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There is currently a pump that sends fluid to a main pipe, from where the flow is distributed evenly to 3 adsorption towers; the fluid exiting these towers then gathers in another main pipe, from which it is further distributed evenly to the secondary adsorption towers. How should such flow control be implemented? How can it be ensured that the flow is evenly distributed in both the primary and secondary stages, while maintaining stable operation? Please advise! ! !
There are also 3 secondary adsorption towers, and 3 primary ones as well.
Each branch is equipped with a flow cascade control system, whose setpoint is 1/3 of the total flow rate.
Was the problem solved? From my experience, flow control valves should be installed on each circuit to regulate the flow rate; the set value should be 1/3 of the desired value. It’s sufficient to remove the automatic control for the circuit with the highest flow resistance and switch to manual control – otherwise coupling will occur.
I feel that, to ensure stable flow, it’s best for the pressure in the primary and secondary main pipes to remain stable. I have not adjusted such processes; this is just a suggestion. Let me know the result!
A pressure transmitter is installed at the pump outlet for constant pressure control; an inverter can be used to replace the control valve, and that’s it. There is no need for control at either level one or level two
I don’t know what control system you’re using; generally, mean value control is used； For example, the FOUT function block in CS3000 can directly generate three identical values ； Alternatively, flow control can also be achieved using a ratio block in a 1:1:1 configuration.
I don’t know if the flow rates of your main pipes vary significantly or if high precision is required for maintaining balance. If the variations aren’t significant, then it’s sufficient to set the valve openings of each branch pipe appropriately to achieve balance. If the flow rate in the main pipe varies greatly and high precision is required for the balance of the individual branches, then 1/3 of the main pipe’s flow rate can be used as the set value for controlling the flow rate in two of those branches; the flow rate of the third branch does not need to be controlled, and this should suffice to meet the requirements.