The apparatus has {TAIL ~ two dewatering stages} a preliminary evaporating stage and a residual evaporating stage, a conversion stage and {HEAD ~ a cooling stage} 
The apparatus has { TAIL ~ two dewatering stages } a preliminary evaporating stage and a residual evaporating stage , a conversion stage and { HEAD ~ a cooling stage }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD