Can an iPhone charger be used to condition electricity to be put back into the grid?

I have recently found a device that will charge an iPhone from the heat of a fire and am wondering if I could use that device to dump power back into the grid and lower my energy bill. Obviously the device isn't going to make a huge difference in my energy bill and net metering isn't worth pursuing however every little bit helps.

How you obtain a fire source and keep it non stop?
How much that device cost?
How much electricity it can produce?
Remember, 1KWH at 120V cost about 15 cents. That device produces about 0.4W.
You need to have at least 2500 pieces to produce 1000W at 4V.
How big the fire you need to heat 2500 pieces device?
How much cost you to maintain the fire non stop?
DOES THIS IDEA WORKS WELL AND WORTH TO TRY IT?

TEGs aren't terribly efficient. If you're near power already, you're paying more for the fire's fuel than you are for equivalent electricity.

No, you can't feed the grid with your equipment. The charger uses some passive diodes to rectify the AC into DC. To feed the grid, you need much more complex circuitry to actually feed correctly phased AC back to the line and to ensure safety that you're not energizing a line when it is supposed to be off.

Those are good answers. TEG = thermal electric generators, and most of them fail at fire temperatures. Worse I pad chargers and almost all similar devices don't work at all in the reverse direction. Possibly you can plug the output of an average inverter into a 120 volt ac outlet. But a ruined inverter is the usual result. Worse it is illegal except with special inverters designed to feed the grid.