Is there anyone to help?
Thread Content
Reactor vessels can be heated by heat transfer oil, steam, or direct electric heating. So why isn’t there a pipeline air heater or blower to provide circulating heating in the outer coil? Why not?
The heating and heat exchange area of the outer coil is insufficient
The main reason is still the low heat capacity; to achieve an effect comparable to that of heat transfer oils or steam, a very large flow rate, heat transfer area, and temperature difference are required for the same amount of heat transfer. This makes it uneconomical for practical use
It will cause uneven local temperatures in the coil
The air heat transfer coefficient is too low, resulting in a large required area.
You can go and calculate the cost required for heating the air