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[quote user="wjstix"]Maybe I'm missing something...the steam in a steam engine is in the boiler tubes. Superheated steam is essentially being sent thru tubes back thru the firebox area to heat the steam up some more, the steam isn't sent back into the firebox. The water that becomes steam never is in direct contact with the fire.[/quote]I asked the queston about superheated steam because of its relationship to steam locomotives and their knowledge base on this forum, but my question is not about locomotives per se.  It is a question about reclaiming heat from the exhaust of any fossil fuel engine, converting it into superheated steam, and injecting the steam back into the combustion chambers.  It is my speculative concept inspired by the BMW turbosteamer hybird vehicle, as an alternative to that BMW concept.It may not be practical, feasible, or worthwhile, and it may be nothing new.  So I wanted to know if anybody has heard of it being used or considered.  If the concept were to have merit, it could be applied to any internal combustion engine, including locomotives.  As has been pointed out here, the concept has been applied to steam locomotives in the form of the GAS PRODUCER FIREBOX, but the objective in this application is somewhat different than what I have suggested.
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