You seem to know what you are talking about. I am an amateur for sure, but I was under the impression that the slurry mix used in electric generation was formualted to facilitate the switch between coal and oil. I understand the problem with NG. It would have to be almost a stand alone type fuel system. Any comments would be appreciated.
Coal slurry (a mixture of finely ground coal particles and water) has been demonstrated as a technology. It uses burner technology conceptually similar to oil burners. I never followed that technology much and can't remember why it hasn't been adopted more frequently. But it usually come down to one or both of two things:(1) there were technical glitches such as reliability or (2) it wasn't cost competitive. For a site to be dual fueled, would require the additional capital of having both of the fuel handling systems and methods of delivery, as well as some extra pollution control systems: not insignificant capital costs, for which one of the systems would be on stand by for years and years, awaiting the economic climate to do the switch. Again, just some ideas to further discussion.