Cooling issue of the coil inside the reaction vessel
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We are now looking to purchase a reaction kettle that uses jacketed heating oil to raise the temperature of the material inside the inner cylinder to 150°C–170°C. When it is necessary to lower the temperature, can cooling water be directly introduced from the bottom of the inner coil (made of stainless steel) for this purpose? Or is it necessary to cool the heat transfer oil in the kettle jacket to 120°C separately before introducing cooling water into the inner coil?
The temperature inside the tank is adjusted by controlling the temperature of the heat transfer oil
Heat transfer oil is used in the entire heat transfer oil furnace system. Some say it’s fine to pass cooling water directly through the internal coil, while others claim that doing so results in too high a temperature; this can cause the cold water to vaporize, leading to gas buildup and vibrations that may result in cracks in the internal coil
The concern now is that allowing cooling water to flow directly into the inner coil could damage the equipment
A heat transfer oil exchanger can be added; first, the heat transfer oil is cooled using circulating water, and then it returns to the reactor to further reduce its temperature
:Lol, we specialize in manufacturing reaction vessels. I was wondering if your company needs other types of reaction vessels, heat exchangers, and other equipment as well. Enameled reaction vessels that are exposed to heat shocks above 120 degrees will have their enamel crack, but stainless steel and Hastelloy vessels are unaffected by this. It’s definitely not possible to use circulating water directly; first, a heat exchanger must be used to cool the heat transfer oil to below 120° before further cooling can take place
It is feasible to cool the reactor interior by directly introducing circulating water at 150–170°C from the inner coil (the return water pipe at the outlet end can be made appropriately larger). However, over time the coil tends to scale, resulting in a poor cooling effect.
So, if the circulating water is treated better, for example by adding chemicals, wouldn’t it be less prone to scaling?
No matter how good circulating water treatment is, scaling will still occur and affect the cooling effect; it’s just a matter of how long it takes. This is the condition of the flange at the inner coil outlet, which we used before.