Air-dried heating
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Since a small reactor in the laboratory requires gas heating, with a gas flow rate of around 0.6 m3/min and a heating temperature of 80 degrees Celsius, we currently have two options: 1) Use a regular small blower to supply air, which then passes through a dryer before entering a 3-meter-long pipe; resistive wires are used within this pipe to heat the air, resulting in dry, high-temperature gas (at 80 degrees Celsius). This solution has drawbacks: it’s uncertain whether the blower can operate continuously, whether the drying effect will be satisfactory, and the dryer requires additional investment, which is not cost-effective: lol. 2. Use ready-made nitrogen directly, without the need for drying or blowing air. Nitrogen is very cheap for our laboratory, but due to the high flow rate, there are safety risks. Now, the second option is preferred. As for whether it is appropriate to use a resistance wire to heat the gas from room temperature to 80 degrees, we are not sure either; we would like to ask the experts in this forum for their advice.
I think it would be better to use a larger hair dryer, right? Our lab did that before, and it worked well :) :)
It would be better to wrap a heating strip around the tube; it’s quite easy to heat it to 80 degrees.
It’s feasible; that’s how we do it in our laboratory； Moreover, the water bath heating system was also built by myself, and it works very well
That’s possible; you can also just buy a heat gun used by electricians
The second option is feasible. Nitrogen is just an inert gas; it is not toxic in itself. However, high concentrations of nitrogen in the air can cause discomfort in humans. I have designed several nitrogen coolers in which the nitrogen is cooled from around 120 degrees to about 45 degrees – essentially the opposite of your process. During the design phase, nitrogen was not considered a toxic gas. In your case, it is necessary to use a resistance wire to heat the nitrogen, the flow rate inside the pipes must not be too high, and attention also needs to be paid to the sealing quality of the pipe connections
No problem. But for air heating, it’s best to use a heating element with fins, as this makes heating easier; the heating power can be increased, and a voltage regulator can also be used, which allows you to adjust the temperature conveniently.