1- under the topic of heat exchanger first wright about heat exchanger in detail with one figure then wright about shell and tube heat exchanger with one figure then wright about current and co-current flow with one figure each one of them in one paragraph for example heat exchanger detail in one paragraph and shell and tube in one paragraph, current and co-current in one paragraph.
2- wright about absorber column in detail with figure explanation.
3- wright pyrolysis reactor in general in one paragraph and wright about non-catalyst plug flow reactor in general in one paragraph and figures.