Interconnect device, fuel cell and fuel cell stack
a technology of interconnection device and fuel cell, which is applied in the direction of fuel cell auxilaries, inorganic chemistry, fuel cells, etc., can solve the problems of large heat input, severe temperature gradients within the cell, and endothermic steam reforming reaction, so as to reduce the thermal gradient and the tensile strength of the fuel cell, and the effect of reducing the tensile strength of the cell
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second embodiment
[0028] In a second embodiment the flow of the fuel is not limited to occur entirely through the porous anode material. It can also flow partly through gaps created between the anode surface and the interconnect surface. This reduces the pressure drop. Such gaps are obtained by making a second layer of channels 6 in the interconnect surface 3, which are at an angle to the supply and collection channels 2 and 4, i.e. they intersect the channels of the channel system, and located on the surface of the channel system shown in FIG. 1. This is shown in FIG. 2, where the interconnect has open supply and collection channels with surface channels 6 created perpendicular to the supply and collection channels. Other angles can be chosen such that the second layer of surface channels 6 are not at right angles to the supply and collection channels 2 and 4. The second layer of surface channels 6, which are closed at both ends, can for instance be diagonally placed relative to the supply and colle...
third embodiment
[0030] In a third embodiment the supply channels are closed and the closed interconnect surface 3 is perforated in the area of the channels. In this embodiment the closed, perforated surface 3 corresponds to the second layer of channels being closed at their surface and at both ends, and perforated in the area of the channels. The channels of the second layer are placed parallel to and directly above those of the channel system. This ensures that fuel passing through a perforation will be reformed only in the vicinity of the perforation. FIG. 3 shows an interconnect with closed gas supply and collection channels, where the fuel flows through perforations made in the interconnect surface 3 above the supply channels and into the porous anode material. The reformed gas leaves the anode and enters the collection channel through the perforations placed above the collection channels 4.
[0031]FIG. 3a shows the presence of small fuel distribution holes 7 in the supply channel 2 and fuel exha...
fourth embodiment
[0032] In a fourth embodiment the flow is partly through a second layer of channels 6 in the interconnect surface 3 at an angle to the supply and collection channels 2 and 4. This reduces the pressure drop. This is shown in FIG. 4 where the second layer of channels 6 are perpendicular to the supply and collection channels 2 and 4 of the channel system. The channels 2 and 4 are partly closed. The second layer of channels 6 can also be at another angle to channels 2 and 4, for instance diagonal. They are closed at both ends.
[0033]FIG. 4a shows a side view of the path followed by the fuel gas indicating the presence of fuel distributing holes 7 in the supply channel 2 and exhaust collecting holes 8 in the collection channel 4.
[0034] In the various embodiments, it can be practical to construct the anode side of the interconnect from two or more interlayers instead of a single layer. This can for instance be done by constructing an interlayer provided with the channel system, and placin...
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Abstract
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