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Reactant Pre-Humidification Using Water Atomization and Porous Water Transport Plates in a PEM Fuel Cell, decreases flooding, and increases membrane exposure to water.
English (United States)
This text was extracted from a Microsoft Word document.
This is the abbreviated version, containing approximately
89% of the total text.
USING WATER ATOMIZATION AND POROUS
WATER TRANSPORT PLATES
IN A PEM FUEL CELL
In a PEM fuel cell, dry reactant gases can
dehydrate the membrane and lead to failure of the membrane. Some PEM fuel cells use water transport
plates (“WTPs”) to humidify the reactants.
However, the WTP does not always fully humidify the reactants before
they reach the active area and are exposed to the membrane.
As a solution
to this problem, the reactants are pre-humidified by atomizing water droplets into
the reactant stream. The fine water droplets created in the atomization process
increases the contact area for humidification of the reactants, and thus the
reactants can reach full humidification before entering the active area. This reduces the risk of membrane failure
due to dehydration. Any excess water
present in the reactant stream can be absorbed into the WTP.
atomization of the water could be achieved by several methods, such as nozzles,
ultrasonication, etc. The water injection ports could be incorporated directly
into the manifolds.
Humidification using water atomization is
not novel. However, using this technique in a fuel cell system that has solid
separator plates instead of WTPs increases the likelihood of flooding within
the cell, since any excess water would need to be removed by entrainment or by
shear-driven flow. In a cell with water
transport plates, the excess water is simply absorbed into the water transport
plate and into the coola...