Hybrid silencer with gas-liquid separating function in fuel cell system

1. A hybrid silencer in a fuel cell system, the hybrid silencer comprising:

an expansion chamber connected to a predetermined apparatus of the fuel cell system, wherein the expansion chamber reduces acoustic noise of a fluid, which is a blend of a liquid component and a gas component, discharged from the predetermined apparatus;

a water-absorber disposed inside the expansion chamber, wherein the water-absorber absorbs the liquid component of the fluid which flows into the expansion chamber from the predetermined apparatus; and

a perforated silencer which discharges the fluid, from which the liquid component is removed by the water-absorber, while reducing acoustic noise of the fluid discharged therefrom,

wherein the expansion chamber comprises:

an inlet pipe which receives the fluid from the predetermined apparatus; and

an outlet pipe which discharges the liquid component absorbed by the water-absorber,

wherein the water-absorber is in contact with the outlet pipe.

2. The hybrid silencer of claim 1 , wherein the perforated silencer comprises:

a cavity defined in an inner space of the hybrid silencer; and

a perforated pipe extending through the cavity.

3. The hybrid silencer of claim 2 , wherein the perforated silencer further comprises a plurality of partitions disposed in the cavity,

wherein the partitions divide the cavity into a plurality of sub-cavities.

4. The hybrid silencer of claim 2 , wherein

a part of the water-absorber is disposed inside the cavity, and

the liquid component of the fluid discharged from holes of the perforated pipe is absorbed by the part of the water-absorber inside the cavity.

5. The hybrid silencer of claim 2 , wherein the hybrid silencer has a shape defined by two boxes having different volumes and combined to each other,

wherein the cavity is in an inner space of a first box of the two boxes having a smaller volume than a second box of the two boxes.

6. The hybrid silencer of claim 5 , wherein

a contacting portion of the two combined boxes is opened,

an inlet of the perforated pipe is disposed at the contacting portion, and

the water-absorber has a space, through which the fluid, which is flowed into the inlet pipe of the expansion chamber, flows to the inlet of the perforated pipe such that the fluid, from which the liquid component is removed by the water-absorber, is discharged through the perforated pipe.

7. The hybrid silencer of claim 1 , further comprising:

a silencer disposed in the water-absorber,

wherein the silencer reduces acoustic noise of the fluid flowed from the expansion chamber.

8. The hybrid silencer of claim 7 , wherein the silencer disposed in the water-absorber reduces acoustic noise of the fluid flowed from the expansion chamber in a frequency band which is different from a frequency band of acoustic noise reduced by the expansion chamber and perforated silencer.

9. The hybrid silencer of claim 7 , wherein the silencer disposed in the water-absorber comprises a Helmholtz resonator.

10. The hybrid silencer of claim 1 , wherein the water-absorber is selected from the group consisting of a sponge, cotton and paper.

11. A hybrid silencer in a fuel cell system, the hybrid silencer comprising:

an expansion chamber connected to a predetermined apparatus of the fuel cell system, wherein the expansion chamber reduces acoustic noise of a fluid, which is blend of a liquid component and a gas component, discharged from the predetermined apparatus;

a water-absorber disposed inside the expansion chamber, wherein the water-absorber absorbs the liquid component of the fluid which flows into the expansion chamber from the predetermined apparatus; and

a perforated silencer which discharges the fluid, from which the liquid component is removed by the water-absorber, while reducing acoustic noise of the fluid discharged therefrom,

wherein the expansion chamber comprises:

an inlet pipe which receives the fluid from the predetermined apparatus; and

an outlet pipe which discharges the liquid component absorbed by the water-absorber,

wherein the hybrid silencer has a shape defined by two boxes having different volumes and combined to each other,

wherein the expansion chamber is in an inner space of a first box of the two boxes having a larger volume than a second box of the two boxes, and

the inlet pipe is disposed in a space generated due to a size difference between the expansion chamber and the perforated silencer.

12. A fuel cell system comprising:

a fuel cell which generates power using a fuel;

a hybrid silencer which separates and discharges a gas component and a liquid component from a fluid flowing inside the fuel cell system, while reducing acoustic noise of the fluid; and

a balance of plants which mixes and supplies the liquid component discharged from the hybrid silencer, and the fuel, to the fuel cell,

wherein a water-absorber is disposed inside the hybrid silencer and absorbs the liquid component of the fluid which flows into the hybrid silencer, wherein the water-absorber is in contact with an outlet pipe of the hybrid silencer, the outlet pipe discharges the liquid component absorbed by the water-absorber.

13. The fuel cell system of claim 12 , wherein the hybrid silencer separates and discharges the gas component and the liquid component from a fluid discharged from the fuel cell, while reducing acoustic noise of the fluid discharged from the fuel cell.

14. The fuel cell system of claim 12 , wherein the balance of plants comprises:

a heat exchanger which cools down a fluid discharged from an outlet at a cathode of the fuel cell,

wherein the hybrid silencer separates and discharges a gas component and a liquid component from a fluid discharged from the heat exchanger, while reducing acoustic noise of the fluid discharged from the heat exchanger.

15. The fuel cell system of claim 12 , wherein the hybrid silencer comprises:

an expansion chamber connected to a predetermined apparatus of the fuel cell system, wherein the expansion chamber reduces acoustic noise of a fluid discharged from the predetermined apparatus which flows into the expansion chamber;

the water-absorber disposed inside the expansion chamber, wherein the water-absorber absorbs a liquid component of the fluid which flows into the expansion chamber; and

a perforated silencer which discharges the fluid from which the liquid component is removed by the water-absorber, while reducing acoustic noise of the fluid discharged therefrom.

16. The fuel cell system of claim 15 , wherein the hybrid silencer has a shape defined by two boxes having different volumes and combined to each other,

wherein the expansion chamber is in an inner space of a first box of the two boxes having a larger volume that a second box of the two boxes.