A fuel cell, a method for operating a fuel cell and a fuel cell system, which ensure no dew condensation for a wet reaction gas in the inlet area of gas channels in plates in a fuel cell stack, are provided. Gas channels 2 and heat medium channels are disposed on one surface and the other surface of
A fuel cell, a method for operating a fuel cell and a fuel cell system, which ensure no dew condensation for a wet reaction gas in the inlet area of gas channels in plates in a fuel cell stack, are provided. Gas channels 2 and heat medium channels are disposed on one surface and the other surface of one plate 1, respectively. Gas channels are disposed on the other plate such that they face the gas channels 2 in the plate 1. A gas inlet header 3 is disposed at the upper part of the gas channel 2 in the plate 1 and a heat medium inlet header is disposed at the upper part of the heat medium channels such that they face the gas inlet header on the other side. Cooling water such as heat medium is supplied from the heat medium supply manifold hole 7 to the heat medium inlet header, thereby warming up the same. The water vapor in the reaction gas (wet fuel gas) is prevented from being condensed in the inlet area of the gas channels 2 by heating up the gas inlet header by the heat conduction.
대표청구항▼
1. A fuel cell comprising a plurality of unit cells being stacked on each other, each of the plurality of unit cells comprising: a first cell having a first anode, a first cathode, and a first electrolyte between the first anode and the first cathode;a first fuel gas path, disposed between a first f
1. A fuel cell comprising a plurality of unit cells being stacked on each other, each of the plurality of unit cells comprising: a first cell having a first anode, a first cathode, and a first electrolyte between the first anode and the first cathode;a first fuel gas path, disposed between a first fuel gas inlet header and a first fuel gas outlet header, for providing a fuel gas to the first anode of the first cell;a first oxidant gas path, disposed between a first oxidant gas inlet header and a first oxidant gas outlet header, for providing an oxidant gas to the first cathode of the first cell;a first plate having a first surface and a second surface at opposite side to the first surface, the first fuel gas path being between the first surface of the first plate and the first anode of the first cell;a second plate having a third surface and a fourth surface at opposite side to the third surface, the first oxidant gas path being between the third surface of the second plate and the first cathode of the first cell;a second cell having a second anode, a second cathode, and a second electrolyte between the second anode and the second cathode;a second fuel gas path, disposed between a second fuel gas inlet header and a second fuel gas outlet header, for providing the fuel gas to the second anode of the second cell;a second oxidant gas path, disposed between a second oxidant gas inlet header and a second oxidant gas outlet header, for providing the oxidant gas to the second cathode of the second cell;a third plate having a fifth surface and a sixth surface at opposite side to the fifth surface, the second fuel gas path being between the fifth surface of the third plate and the second anode of the second cell;a fourth plate having a seventh surface and an eighth surface at opposite side to the seventh surface, the second oxidant gas path being between the seventh surface of the fourth plate and the second cathode of the second cell; anda heat medium path, disposed between a heat medium inlet header and a heat medium outlet header, for distributing a heat medium, the heat medium path being between the fourth surface of the second plate and the sixth surface of the third plate,wherein the heat medium inlet header or the heat medium outlet header is disposed to overlap with both the second fuel gas inlet header and the first oxidant gas inlet header in a perspective from a direction of the stacking the unit cells,wherein the fuel gas flowing in the second fuel gas path flows in the direction parallel to the oxidant gas flowing in the first oxidant gas path, both the fuel gas flowing in the second fuel gas path and oxidant gas flowing in the first oxidant gas path flow from top to bottom in the direction of gravity, andwherein the heat medium flowing in the heat medium path between the fourth surface of the second plate and the sixth surface of the third plate flows in the direction parallel or anti-parallel to the fuel gas flowing in the second fuel gas path and the oxidant gas flowing in the first oxidant gas path and flows from top to bottom or from bottom to top in the direction of gravity. 2. The fuel cell according to claim 1, wherein the second fuel gas path and the first oxidant gas path are substantially straight. 3. The fuel cell according to claim 1, wherein the fuel cell further comprises a flow resistance generation section between the second fuel gas inlet header and the second fuel gas path and/or between the first oxidant gas inlet header and the first oxidant gas path. 4. The fuel cell according to claim 2, wherein the fuel cell further comprises a flow resistance generation section between the second fuel gas inlet header and the second fuel gas path and/or between the first oxidant gas inlet header and the first oxidant gas path. 5. The fuel cell according to any one of claim 1 to claim 4, wherein a dew point of the fuel gas to be supplied to the second fuel gas inlet header and/or a dew point of the oxidant gas to be supplied to the first oxidant gas inlet header are/is less than or equal to a temperature of the heat medium to be supplied to the heat medium inlet header in the case when the heat medium flowing in the heat medium path between the fourth surface of the second plate and the sixth surface of the third plate flows in the direction parallel to both the fuel gas flowing in the second fuel gas path and the oxidant gas flowing in the first oxidant gas path in normal operation, and wherein a dew point of the fuel gas to be supplied to the second fuel gas inlet header and/or a dew point of the oxidant gas to be supplied to the first oxidant gas inlet header are/is less than or equal to a temperature of the heat medium discharged from the heat medium outlet header in the case when the heat medium flowing in the heat medium path between the fourth surface of the second plate and the sixth surface of the third plate flows in the direction anti-parallel to both the fuel gas flowing in the second fuel gas path and the oxidant gas flowing in the first oxidant gas path in normal operation. 6. The fuel cell according to claim 5, wherein a dew point of the fuel gas to be supplied to the second fuel gas inlet header is less than or equal to a temperature of the oxidant gas to be supplied to the first oxidant gas inlet header, or a temperature of the fuel gas to be supplied to the second fuel gas inlet header is greater than or equal to a dew point of the oxidant gas to be supplied to the first oxidant gas inlet header in normal operation. 7. The fuel cell according to claim 5, wherein a dew point of the fuel gas discharged from the second fuel gas outlet header and/or a dew point of the oxidant gas discharged from the first oxidant gas outlet header are/is greater than or equal to a temperature of the heat medium discharged from the heat medium outlet header in the case when the heat medium flowing in the heat medium path between the fourth surface of the second plate and the sixth surface of the third plate flows in the direction parallel to both the fuel gas flowing in the second fuel gas path and the oxidant gas flowing in the first oxidant gas path in normal operation, and wherein a dew point of the fuel gas discharged from the second fuel gas outlet header and/or a dew point of the oxidant gas discharged from the first oxidant gas outlet header are/is greater than or equal to a temperature of the heat medium to be supplied to the heat medium inlet header in the case when the heat medium flowing in the heat medium path between the fourth surface of the second plate and the sixth surface of the third plate flows in the direction anti-parallel to both the fuel gas flowing in the second fuel gas path and the oxidant gas flowing in the first oxidant gas path in normal operation. 8. The fuel cell according to claim 6, wherein a dew point of the fuel gas discharged from the second fuel gas outlet header and/or a dew point of the oxidant gas discharged from the first oxidant gas outlet header are/is greater than or equal to a temperature of the heat medium discharged from the heat medium outlet header in the case when the heat medium flowing in the heat medium path between the fourth surface of the second plate and the sixth surface of the third plate flows in the direction parallel to both the fuel gas flowing in the second fuel gas path and the oxidant gas flowing in the first oxidant gas path in normal operation, and wherein a dew point of the fuel gas discharged from the second fuel gas outlet header and/or a dew point of the oxidant gas discharged from the first oxidant gas outlet header are/is greater than or equal to a temperature of the heat medium to be supplied to the heat medium inlet header in the case when the heat medium flowing in the heat medium path between the fourth surface of the second plate and the sixth surface of the third plate flows in the direction anti-parallel to both the fuel gas flowing in the second fuel gas path and the oxidant gas flowing in the first oxidant gas path in normal operation.
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이 특허에 인용된 특허 (4)
Lee, James H., Coolant flow field design for fuel cell stacks.
Chow Clarence Y. (Vancouver CAX) Wozniczka Boguslav M. (Coquitlam CAX), Electrochemical fuel cell stack with humidification section located upstream from the electrochemically active section.
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