Highly integrated fuel processor for distributed hydrogen production
View Patent ↗A recuperative heat exchanger ( 36 ) is provided for use in a fuel processor ( 20 ), the heat exchanger ( 36 ) transferring heat from a fluid flow ( 34 ) at one stage of a fuel processing operation to the fluid flow ( 32 ) at another stage of the fuel processing operation. The heat exchanger ( 36 ) includes a housing ( 56 ) defining first and second axially extending, concentric annular passages in heat transfer relation to each other; a first convoluted fin ( 70 ) located in the first passage to direct the fluid flow therethrough; and a second convoluted fin ( 72 ) located in the second passage to direct the fluid flow therethrough.
1. A recuperative heat exchanger for use in a fuel processing system, the heat exchanger transferring heat from a fluid flow at one stage of a fuel processing operation to said fluid flow at another stage of the fuel processing operation, the heat exchanger comprising:
a structure;
a cylindrical wall having a first end axially fixed to the structure and a second end that is not fixed axially to the structure;
a first convoluted fin bonded to a radially inwardly facing side of said wall, the convolutions of the first convoluted fin extending axially to direct said fluid flow through the heat exchanger;
a second convoluted fin bonded to a radially outwardly facing side of said wall, the convolutions of the second convoluted fin extending axially to direct said fluid flow through the heat exchanger; and
a flow path over the second end of the wall to direct said fluid flow from one side of the wall to the other side of the wall.
2. The recuperative heat exchanger of claim 1 wherein said fins have surface enhancements.
3. The recuperative heat exchanger of claim 2 wherein said surface enhancements are fin louvers.
4. The recuperative heat exchanger of claim 1 further comprising a cylindrical water-gas shift reactor extending centrally through said heat exchanger at a location radially inward from said first fin.
5. A fuel processing system comprising:
a steam reformer; and
a recuperative heat exchanger, the heat exchanger connected to the steam reformer to direct a fluid flow to the steam reformer, the fluid flow being a steam/fuel feed mix to be reformed in said steam reformer into a reformate, the steam reformer connected to the heat exchanger to direct the fluid flow back to the heat exchanger after it has been reformed into said reformate; the heat exchanger comprising:
a structure;
a cylindrical wall having a first end axially fixed to the structure and a second end that is not fixed axially to the structure;
a first convoluted fin bonded to a radially inwardly facing side of said wall, the convolutions of the first convoluted fin extending axially to direct said fluid flow through the heat exchanger;
a second convoluted fin bonded to a radially outwardly facing side of said wall, the convolutions of the second convoluted fin extending axially to direct said fluid flow through the heat exchanger; and
a flow path over the second end of the wall to direct said fluid flow from one side of the wall to the other side of the wall.
6. The fuel processing system of claim 5 wherein said fins have surface enhancements.
7. The fuel processing system of claim 6 wherein said surface enhancements are fin louvers.
8. The fuel processing system of claim 5 further comprising a cylindrical water-gas shift reactor extending centrally through said heat exchanger at a location radially inward from said first fin.