A schematic process flow diagram for a natural gas fueled PEMFC system is given

Question

A schematic process flow diagram for a natural gas fueled PEMFC system is given below. Answer the following questions based on this schematic. List all the sub systems involved for fuel processing and delivery into fuel cell stack (in sequential order) Briefly explain the function(s) of the reformer and the vaporizer. Provide any relevant chemical equations. Explain why the selective oxidizer unit is required for this fuel cell system. Which sub system may not require if ethanol (from com) is used as the fuel? Explain your answer. Which sub system(s) not necessary if the PEMFC is replaced with a SOFC stack, while keeping the external reformer.

Explanation / Answer

Answer a.

Basically, The physical structure of a PEMFC consists of seven components,
1.Feeding channels
2.Diffusion layer
3.Catalytic layer in the
anode
4.Membrane
5Catalytic layer
6Diffusion layer
7Feeding channels in the cathode.

Answer b.

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