A fuel conversion reactor 4, said secondary shell member further comprising a secondary inner shell member and, said shell and tube heat exchanger further comprising: a further passageway formed between said secondary inner shell member and said outer shell and extending from said first end to said second end of the secondary inner shell member, for flow of {HEAD ~ a mixture} of said fuel and said {TAIL ~ gaseous fluid therethrough} 
A fuel conversion reactor 4 , said secondary shell member further comprising a secondary inner shell member and , said shell and tube heat exchanger further comprising : a further passageway formed between said secondary inner shell member and said outer shell and extending from said first end to said second end of the secondary inner shell member , for flow of { HEAD ~ a mixture } of said fuel and said { TAIL ~ gaseous fluid therethrough }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL