recovering heat from at least one of the fuel, steam, hot gasses, and hot fluid exiting {HEAD ~ the energy conversion process} to preheat {TAIL ~ the high solids waste stream} 
to preheat
recovering heat from at least one of the fuel , steam , hot gasses , and hot fluid exiting { HEAD ~ the energy conversion process } to preheat { TAIL ~ the high solids waste stream }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL