A temperature signal step control
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One temperature signal, two steam control valves (with the same operation), two cooling water inlet control valves (with the same operation); when the temperature reaches a certain level, the two steam control valves close completely while the two cooling water valves start to open. Is it possible to implement step-controlled operation? Two more hydrophobic cut-off valves and the cooling water return cut-off valve also require this temperature signal.
In general, this situation involves control of the reaction vessel, requiring cascade control of both the vessel temperature and the jacket temperature. As for the division into a large valve and a small valve, it is done to achieve more precise control
Are there adjustment processes for the two steam valves and the two cooling water valves? It is better to describe the process control in more detail for easier analysis.
Of course, split-control is possible; as for the shut-off valve, it can be interlocked with the control valve
For example, heat the material to 130 degrees and maintain that temperature for one hour; then add more material and heat it to 180 degrees, again maintaining that temperature for one hour.
It can be done. During normal operation, the temperature sensing sensor controls the opening and closing as well as the degree of adjustment of the steam valve and the cooling water valve in order to regulate and control the temperature. In extreme situations, the upper and lower limit interlock signals from the temperature measuring instrument are used to control the drain valve and the return water valve to carry out interlocked actions. It is guessed that this is the temperature control circuit for a double-jacketed or segmented-jacketed reactor. But under normal circumstances, the shutdown of the water rejection and return flow should be controlled by another temperature sensor to ensure safety. If there is a hydrogenation process or the level of hazard is high, additional temperature sensors are required to meet the requirements of the SIS system. Personal opinion
Although I can’t do it, I feel that it should be possible to carry out such an operation.
I had just been doing it for three minutes; when I saw your message, I sent it right away. You can refer to this as a guide.