No cause was given for the fire in China, and there was no indication of what burnables were present.
For present purposes I'll just assume it was the cardboard hamburgers being fed to the work crew, and that they don't burn very hot. It would be expected that they'd make a lot of smoke(?).
That's sufficient to satisfy my curiosity until some "facts" (as opposed to imaginary delusions) and some "competent opinions" (as opposed to gossip mongering) appear.
It is, of course, encouraging when young and immature minds show an active interest in science and engineering, but it does get tedious constantly explaining that they haven't learned everything just because their high school teacher told them what to read in their introductory texts.