KR-102962194-B1 - EXHAUST DEVICE FOR POWER GENERATION TYPE FUEL CELL SYSTEM

KR102962194B1KR 102962194 B1KR102962194 B1KR 102962194B1KR-102962194-B1

Abstract

The present invention aims to provide an exhaust device for a power generation fuel cell system, wherein exhaust pipes formed in a plurality of fuel cell integrated modules to discharge water, hydrogen, and air are connected to a single integrated exhaust pipe, and high-temperature outside air blown from a radiator for cooling the fuel cell integrated modules is directed to the integrated exhaust pipe, thereby allowing water to be easily discharged without freezing during the winter and enabling the air from the outside air to mix with hydrogen to reduce the hydrogen concentration.

Inventors

전연식
김용립
김수지

Assignees

현대자동차주식회사
기아 주식회사

Dates

Publication Date: 20260507
Application Date: 20210118

Claims (10)

An exhaust device for a power generation fuel cell system comprising a plurality of fuel cell integrated modules and a radiator for cooling each fuel cell integrated module, An integrated discharge pipe connected to the plurality of fuel cell integrated modules above so as to be communicable; and A backflow prevention damper mounted in a gas inlet hole formed in the integrated discharge pipe so as to be openable and closable, which opens by external air blowing from the radiator; An exhaust device for a power generation fuel cell system characterized by being composed including
In claim 1, An exhaust device for a power generation type fuel cell system, characterized in that the above-mentioned backflow prevention damper remains closed when the pressure of the outside air is not applied, and operates to open when the pressure of the outside air is applied.
In claim 2, An exhaust device for a power generation fuel cell system characterized in that the rotation axis of the above-mentioned backflow prevention damper is hinge-connected to both sides of the gas inlet hole by means of a return spring.
In claim 2, An exhaust device for a power generation fuel cell system, characterized in that a magnet attached to the inner surface of the gas inlet hole of an integrated exhaust pipe is further attached to the leading end of the above-mentioned backflow prevention damper.
In claim 1, An exhaust device for a power generation fuel cell system, characterized in that the tip of the above-mentioned backflow prevention damper is formed with a curved cross-sectional structure for the Coander effect.
In claim 1, An exhaust device for a power generation type fuel cell system, characterized in that a bulkhead is attached to the front of the fuel cell integrated module facing the above-mentioned radiator to guide outside air blowing from the radiator toward a backflow prevention damper.
In claim 1, An exhaust device for a power generation fuel cell system characterized by the above-mentioned radiator being arranged with an incline to blow outside air into the above-mentioned gas inlet hole.
In claim 1, An exhaust device for a power generation type fuel cell system, characterized in that when water, hydrogen, and air are discharged from the fuel cell integrated module into the integrated exhaust pipe, a backflow prevention damper is opened by the pressure of the outside air blowing from the radiator, so that the outside air is mixed with water, hydrogen, and air within the integrated exhaust pipe.
In claim 8, An exhaust device for a power generation fuel cell system characterized in that the outside air blown from the above-mentioned radiator is in a warm air state, and the outside air in a warm air state is mixed with water, hydrogen, and air within an integrated exhaust pipe.
In claim 1, An exhaust device for a power generation fuel cell system, characterized in that a discharge pipe is integrally formed or separately connected to the lower part of the fuel cell integrated module so as to be in communication with the integrated discharge pipe.

Description

Exhaust Device for Power Generation Type Fuel Cell System The present invention relates to an exhaust device for a power generation fuel cell system, and more specifically, to an exhaust device for a power generation fuel cell system that enables the smooth discharge of water and hydrogen purged from a plurality of fuel cell integrated modules. A fuel cell system comprises a fuel cell stack that generates electrical energy, a hydrogen supply system that supplies fuel (hydrogen) to the fuel cell stack, an air supply system that supplies oxygen from the air—an oxidant necessary for the electrochemical reaction in the fuel cell stack—and a heat and water management system that controls the operating temperature of the fuel cell stack. The above fuel cell stack is a plurality of unit cells stacked and assembled to generate electrical energy by reacting hydrogen ( H₂ ) and oxygen ( O₂ ). Each unit cell includes a membrane electrode assembly (MEA) composed of an electrolyte membrane, an anode electrode located on one side of the electrolyte membrane to supply hydrogen ( H₂ ), and a cathode electrode located on the other side of the electrolyte membrane to supply air; and a gas diffusion layer (GDL) stacked on the outer side of the anode electrode and the cathode electrode. Accordingly, the reaction for generating electricity in the fuel cell stack occurs in the membrane-electrode assembly. After hydrogen supplied to the anode electrode, which is the oxidation electrode, is separated into hydrogen ions (protons) and electrons, the hydrogen ions move through the electrolyte membrane toward the cathode electrode, which is the reduction electrode, and the electrons move through an external circuit toward the cathode electrode. At the cathode, oxygen molecules, hydrogen ions, and electrons react together to generate electricity and heat, while simultaneously producing water ( H₂O ) as a reaction byproduct. A fuel cell system including a fuel cell stack that generates electricity as described above, a hydrogen supply system that supplies fuel (hydrogen) to the fuel cell stack, an air supply system that supplies oxygen from the air, which is an oxidant required for the electrochemical reaction in the fuel cell stack, and a heat and water management system that controls the operating temperature of the fuel cell stack, is manufactured as a single integrated module structure and is referred to as a fuel cell integrated module. The above fuel cell integrated module is mainly installed in fuel cell vehicles, but to diversify the sales business of fuel cell systems, a power generation type fuel cell system is manufactured in which a plurality of fuel cell integrated modules (10) are packaged in a predetermined arrangement within a casing (20) as shown in FIG. 1. In the case of the above-mentioned power generation fuel cell system, unlike a fuel cell system installed in a fuel cell vehicle for driving purposes, multiple fuel cell integrated modules are used for power generation, so a new packaging method is required. For example, since water is discharged simultaneously during the reaction for electricity generation in multiple fuel cell integrated modules included in a power generation fuel cell system, a method is needed to ensure that a large amount of water can be discharged smoothly without freezing during the winter. In addition, since unreacted residual hydrogen from multiple fuel cell integrated modules is simultaneously purged or emitted all at once due to initial startup, measures are required to manage exhaust hydrogen concentration below an appropriate level for safety. FIG. 1 is a configuration diagram illustrating an example of a power generation type fuel cell system, FIG. 2 is a schematic perspective view illustrating an exhaust device of a power generation type fuel cell system according to the present invention. FIGS. 3 and 4 are schematic cross-sectional views illustrating an exhaust device of a power generation type fuel cell system according to the present invention. FIG. 5 is a schematic cross-sectional view illustrating an embodiment in which a partition wall is further installed in the exhaust device of a power generation type fuel cell system according to the present invention. FIG. 6 is a schematic cross-sectional view illustrating an embodiment in which a backflow prevention damper is provided in a curved structure among the exhaust device configurations of a power generation fuel cell system according to the present invention. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Figure 2 attached is a schematic perspective view illustrating an exhaust device of a power generation type fuel cell system according to the present invention, and Figures 3 and 4 are schematic cross-sectional views illustrating an exhaust device of a power generation type fuel cell system according to the present invention. As illustrated in F