Regarding the tuning of cascade control
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Hello everyone. There are many types of control methods in chemical process control, and I would like to ask about the application of cascade control in chemical processes. Thank you for sharing your insights.
Cascade control is also widely used in the chemical industry, such as for controlling the temperature of the reactor in distillation towers. The heat carrier used to control the reactor temperature can have flow rate as the secondary variable while the reactor temperature serves as the primary variable; flow rate regulation operates in the secondary loop, and temperature regulation in the primary loop. The two regulators are connected in series to control the control valve, thereby achieving constant temperature control.
Could you give a specific example and break it down?
It’s a pretty good question; we’ll share it if we have it
That’s the case; is cascade control IMA used for temperature and pressure control in the polymerization reactors of the polypropylene industry?
I am not familiar with the processes and controls in the polypropylene industry, but cascade control can be used for the temperature and pressure in the polymerization reactor. Since the reactor temperature has a certain degree of lag while the reactor pressure responds more quickly, and since reactor temperature is an important parameter that needs to be controlled, cascade control can be employed to achieve better temperature control – with reactor pressure serving as the secondary variable and reactor temperature as the primary variable; the flow rate of the heat transfer medium in the reactor can then be adjusted accordingly