Cause analysis of the combustion phenomenon in the reactor
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Gentle experts, I’ve encountered a very strange problem recently: in our polyester reactor, after the material was discharged and the reactor was purged with nitrogen, a combustion reaction occurred inside the reactor. The temperature inside the reactor rose, and the remaining polyester was completely carbonized. As soon as it was detected that the temperature inside the reactor was increasing, a large amount of nitrogen was introduced into the reactor and then expelled through the casting head, during which sparks could be seen. Later, I checked and found that both positive and negative pressures were normal. I’m a bit confused now; please help me analyze this. 1. Polyester is inherently flame-retardant ； 2. The by-product is acetic acid ； 3. Ethylene glycol is used for cooling in the mechanical seal.
Does air enter when discharging from the polyester reactor? It is recommended to use nitrogen for pressurized discharging.
Introducing a large amount of nitrogen can increase the flow rate of the gas mixture, resulting in sparks generated by friction with the metal and air.
Could you please provide a contact method? I’d like to ask you for some advice, thank you!
We’ve always used nitrogen; no air has ever gotten in. The operating procedures have remained unchanged, and there have been no issues with either positive or negative pressure in the reactor. I have no idea how air got in—logically speaking, oxygen must have gotten in as well.
When nitrogen is filled, the pressure is too high and the flow rate is too fast, resulting in static electricity that causes ignition.