What is the purpose of controlling the circulation water volume using the reactor cooling water temperature?
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This post was last edited by yiyuguchen on 2019-4-30 at 10:22. What is the purpose of the circulating water volume required for controlling the temperature of the cooling water in the reactor? Why not use only the reaction temperature to control the required amount of circulating water? Also need to add a jacket water temperature
The temperature inside the reactor cannot be controlled, as changes in the opening degree of the cooling water control valve do not affect the temperature of the cooling water downstream of that valve.
In fact, your question can be rephrased as asking what the advantages of cascade loop control are over single-loop control. A cascade loop can prevent disturbances in the secondary loop; specifically, if the cooling water control valve is controlled based on the reactor temperature, then adjustments will only be made when there are fluctuations in the temperature of the cooling water system； By using cascade control of the reactor temperature to regulate the cooling water temperature, even when there are significant changes in the temperature and pressure of the cooling water network, the reactor temperature may not yet fluctuate; however, the cooling water temperature will respond promptly, allowing for timely adjustments. This approach is more stable than the previous simpler control method.
Okay, thank you! I would like to ask whether, for the secondary circuit (jacket water), temperature is used as the controlled variable or flow rate is used as the controlled variable?
From my experience, temperature is better, as the supply temperature of circulating water is greatly affected by environmental conditions, while its flow rate remains relatively stable.
Has everyone taken a close look? There’s another pump that’s circulating as well!
The purpose of the circulation pump is to increase the flow rate of water in the jacket, thereby increasing the heat transfer coefficient. The heat exchange area of the jacket is limited, resulting in a low heat exchange capacity. It would be best if the external circulation effect could be increased.
I think the main purpose here is to control the amount of circulating water entering as much as possible, since there is a large temperature difference between the actual temperature of the reactor and that of the circulating water. The jacketed circulating water has a self-circulation system, so no fresh circulating water is needed as long as the temperature remains within acceptable limits, which facilitates better control of the reactor’s temperature.
Judging from the process, this cooling water enters from above and exits from below. I don’t quite understand.