Control of the temperature in a jacketed reactor
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Regarding the temperature control of the jacketed reactor: The reaction temperature in this jacketed reactor is 120°C. Steam is used as the heat source to maintain this temperature, while circulating water serves as the cooling source; the reaction is exothermic. We plan to control the temperature of the reactor by installing control valves in the steam inlet pipeline, but I feel it’s not very easy to adjust. Has anyone with experience designed this type of jacketed reactor? I’d appreciate some advice.
The most common control scheme for steam heating relies on the proper selection of automatic control valves and the quality of the control system.
Temperature measurement must be accurate; monitor the temperatures at the steam inlet and outlet, as well as the flow rates, and also the temperatures and flow rates of the circulating water at its inlet and outlet
It is possible to control the temperature of the reaction vessel by installing a control valve on the steam inlet pipe; alternatively, a control valve can be added to the circulating water pipe to regulate the cooling rate.
I have the feeling that using only a control valve and steam to regulate the temperature is not easy to control
Of course, staged control must be used to regulate the heat source and the cold source; it is not sufficient to control only the heat source
If circulating water is pumped in while there is a pressure of 1 kilogram inside the jacket, won’t that cause problems?
Could you draw a simple diagram to help everyone analyze it? The jacketed reactor we use controls the temperature of the reactor by regulating the flow rate of circulating water, and it works quite well.
Step control should be employed using steam and cold water. However, the PID control loop of the TIC is difficult to tune; it’s best to add feedforward control, otherwise over-temperature may occur and cause the equipment to stop operating
Problems related to temperature control in jacketed reactors: The reaction temperature in the jacketed reactor is 120°C, and steam is used as the heat source to maintain this temperature. It is necessary to determine the specific heat of the medium inside the reactor, its mass, the heat exchange area, and the heat exchange efficiency. Additionally, it is important to determine the maximum and minimum steam flow rates for the control valve, as well as to select the appropriate type of control valve； The reaction is exothermic; what is the temperature at which it begins? Can the amount of heat released be calculated? In other words, can the reaction continue after it starts? Is it necessary to use circulating water for cooling, and what volume of water is required? Limits must be taken into account for these values.
Similar to what I have here, a coolant is used; heating is hardly necessary, as the heat released during addition is sufficient to raise the temperature to the desired level