Fuel cell system
A fuel cell system includes a fuel exhaust gas inlet channel for guiding a fuel exhaust gas containing liquid water discharged from a fuel cell stack to a gas liquid separator provided downstream of a humidifier in an oxygen-containing gas inlet channel. The specific gravity of the fuel exhaust gas is lighter than the specific gravity of the oxygen-containing exhaust gas. An outlet channel of the gas liquid separator includes a stirring booster having a first point and a second point positioned downstream of the first point. The second point is positioned ahead of the first point in the gravity direction.
1. A fuel cell system comprising:
a fuel cell configured to generate electricity by an electrochemical reaction of a fuel gas and an oxygen-containing gas;
an oxygen-containing gas inlet channel configured to supply the oxygen-containing gas to the fuel cell;
a humidifier provided in the oxygen-containing gas inlet channel;
a gas liquid separator provided downstream of the humidifier in the oxygen-containing gas inlet channel; and
a fuel exhaust gas inlet channel configured to guide a fuel exhaust gas containing liquid water discharged from the fuel cell to the gas liquid separator,
wherein the gas liquid separator comprises:
a separator body configured to perform gas liquid separation of both of the oxygen-containing gas humidified by the humidifier and a fuel exhaust gas containing liquid water guided from the fuel exhaust gas inlet channel; and
an outlet channel configured to discharge the oxygen-containing gas and the fuel exhaust gas after gas liquid separation from the separator body, and
wherein a specific gravity of the fuel exhaust gas flowing through the outlet channel is lighter than a specific gravity of the oxygen-containing gas; and
the outlet channel comprises a stirring booster having a first point and a second point positioned downstream of the first point;
the second point is positioned ahead of the first point in a gravity direction, and
the stirring booster of the outlet channel extends in the gravity direction and is in fluid communication with an extension channel that extends in a perpendicular direction to the gravity direction, and the fuel exhaust gas and the oxygen-containing gas flow through the stirring booster of the outlet channel from the first point to the extension channel along the gravity direction.
2. A fuel cell system comprising:
a fuel cell configured to generate electricity by an electrochemical reaction of a fuel gas and an oxygen-containing gas;
an oxygen-containing gas inlet channel configured to supply the oxygen-containing gas to the fuel cell;
a humidifier provided in the oxygen-containing gas inlet channel;
a gas liquid separator provided downstream of the humidifier in the oxygen-containing gas inlet channel; and
a fuel exhaust gas inlet channel configured to guide a fuel exhaust gas containing liquid water discharged from the fuel cell to the gas liquid separator,
wherein the gas liquid separator comprises:
a separator body configured to perform gas liquid separation of both of the oxygen-containing gas humidified by the humidifier and a fuel exhaust gas containing liquid water guided from the fuel exhaust gas inlet channel; and
an outlet channel configured to discharge the oxygen-containing gas and the fuel exhaust gas after gas liquid separation from the separator body, and
wherein a specific gravity of the fuel exhaust gas flowing through the outlet channel is lighter than a specific gravity of the oxygen-containing gas; and
the outlet channel comprises a stirring booster having a first point and a second point positioned downstream of the first point; and
the second point is positioned ahead of the first point in a gravity direction,
wherein the outlet channel includes an extension channel extending from a lower end of the stirring booster in a direction substantially perpendicular to a direction in which the stirring booster extends; and
wherein an inner surface of the extension channel includes a flat surface configured to face an opening at the lower end of the stirring booster.
3. The fuel cell system according to claim 1 , wherein the outlet channel includes a coupling part configured to couple an upper end of the stirring booster and a portion above the center of the separator body in a vertical direction, together.
4. The fuel cell system according to claim 1 , wherein the gas liquid separator includes a fuel exhaust gas inlet configured to supply a fuel exhaust gas containing liquid water guided from the fuel exhaust gas inlet channel into the separator body; and
a fuel exhaust gas separation wall is provided in the separator body in a manner that the fuel exhaust gas separation wall faces an opening of the fuel exhaust gas inlet.
5. The fuel cell system according to claim 4 , wherein the separator body has an oxygen-containing gas inlet oriented in a direction intersecting with a direction in which the opening of the fuel exhaust gas inlet is oriented and configured to supply the oxygen-containing gas humidified by the humidifier into the separator body.
6. The fuel cell system according to claim 5 , wherein the fuel exhaust gas inlet is provided at a lower position of the separator body in a manner that the fuel exhaust gas containing the liquid water flows upward.
7. The fuel cell system according to claim 6 , wherein an outlet port connected to an inner hole of the outlet channel is provided in a portion above the center of the separator body in a vertical direction.
8. The fuel cell system according to claim 6 , wherein the fuel exhaust gas separation wall comprises:
a flat shaped separation wall body configured to face an opening of the fuel exhaust gas inlet; and
a protrusion protruding downward from the separation wall body.
9. The fuel cell system according to claim 1 , wherein the gas liquid separator is provided integrally with the humidifier.
10. The fuel cell system according to claim 3 , wherein an inner surface of the coupling part includes a curved surface configured to guide the oxygen-containing gas and the fuel exhaust gas guided from inside of the separator body, in the gravity direction.