The resulting low temperature gases can be introduced into the hot reaction zone either through {HEAD ~ the carbon vehicle} for {TAIL ~ the hot reaction bed} or directly mixed with fresh air 
for
The resulting low temperature gases can be introduced into the hot reaction zone either through { HEAD ~ the carbon vehicle } for { TAIL ~ the hot reaction bed } or directly mixed with fresh air
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH