An apparatus for carrying out a multi-step process of converting hydrocarbon
fuel
to a substantially pure hydrogen gas feed includes a plurality of modules each
module being in fluid communication with adjacent modules. The modules may be arranged
axially along a common axis of flow or alternatively the modules are arranged along
a common axis so that they are nested one within the other. The multi-step process
includes: providing a fuel processor having a plurality of modules; and feeding
the hydrocarbon fuel successively through each of the modules in the reactor to
produce the hydrogen rich gas.
