Without control valves, how can the required amount of circulating water be ensured?
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In a batch reactor, heating is carried out using steam or heat transfer oil, which raises the temperature to, for example, 180 degrees; thereafter, the process requirements dictate that the temperature be reduced to 80 degrees. In this process, steam or heat transfer oil is used to control the temperature by adjusting the opening degree of the control valve on the temperature control line inside the tank; single-loop control is employed. There are no control instruments on the circulating water pipeline aside from the manual shut-off valve (gate valve). How can we ensure that the water supply for circulation is stopped once the temperature drops to 80 degrees? I checked the flowcharts for several projects and found that they all use this design; there are even steam pipelines without control valves. Please help.
Steam and circulating water can act on the same reactor together, while heat transfer oil acts on a single reactor. If heat transfer oil, steam, and circulating water all act on the same jacket of the tank, the circulating water or steam condensate will be contaminated by the heat transfer oil, making it difficult to handle. Additionally, water can enter the heat transfer oil; when this oil is heated again, there will be popping sounds and vibrations caused by the vaporization of water inside the heating oil furnace. Regulating valve for continuous heating, used in intermittent operation; the regulating valve is unable to provide sufficient adjustment, leading to easy overheating. Manual adjustment is just fine.
I don’t understand; in which device is the circulating water used? What kind of water is circulating water?
For a reactor that undergoes intermittent heating and cooling within such a temperature range, it is ideal to use heat transfer oil to heat the outer jacket (or outer coil), and circulating cooling water to cool the inner coil; control valves can be used to regulate the temperature in both cases. I hold a patent for an \"energy-efficient heat transfer oil heating and cooling system\" designed specifically for such reaction systems; feel free to contact me if you are interested.
If heat transfer oil is used for heating, then cold heat transfer oil (cold oil) is used for cooling, and the cold oil system is cooled by circulating water (secondary heat exchange). Automatic valves are installed for both the heat transfer oil and the cold oil. If steam is used for heating, circulating water can be used for cooling. Both steam and circulating water are controlled by automatic valves; it is advisable to have a drainage system, which allows the circulating water in the jacket to be drained into a water tank before steam heating begins. This will improve the heating efficiency.
My problem now is why this batch reactor I have doesn’t have control valves on the circulation water pipeline – does it really mean that one has to manually close the valve whenever the temperature drops, just by looking at it? The hot oil/cold oil heating system does have automatic control valves and on/off valves
I feel that this process isn’t quite right; could you take a screenshot of the drawings?
Does your reactor use an internal coil for heating and a jacket for cooling? Is the heating medium circulated through the coil, while cooling is achieved through the jacket? If that’s the case, then it’s easy to understand! The circulating cooling water does not have its flow rate adjusted or can be shut off; the isolation valve is opened when cooling is needed, while the temperature is regulated by the heating medium!
Many of our units lack control valves, and the temperature is fine; it’s just that the workload for the workers is a bit higher, which is also a characteristic of intermittent devices.
If you use heat transfer oil to control heating and cooling water to control cooling, then a control valve must also be installed for cooling. Moreover, when one system is in operation, the other system must be turned off; otherwise, chaos will ensue. Because they are two separate systems after all!
It is entirely possible for the circulating water pipeline to have no control valves; once the reaction is complete and the material is cooled and discharged, precise control is not necessary – manual control will suffice!