KR101405737B1 - Fuel cell system embedded ejector - Google Patents

Abstract

The present invention relates to an ejector-mounted fuel cell system, and more particularly, to a fuel cell system with an ejector, more specifically, an ejector of a cartridge type is detachably incorporated in an end plate or a fuel electrode manifold to increase the hydrogen recirculation amount of the fuel electrode, To an Ejector built-in type fuel cell system capable of improving the overall performance of the fuel cell stack.

That is, according to the present invention, a cartridge-type ejector which is easy to remove and attach is mounted in an end plate (or a common distribution structure) of a fuel cell stack or in an anode manifold of a fuel cell stack to reduce the shortening of the recycle path and the pressure drop of the flow path The hydrogen recirculation amount can be maximized and the fuel cell hydrogen recirculation system itself can be simplified to greatly reduce the volume / weight of the entire fuel cell system. As a result, the efficiency of the fuel cell system can be improved and the fuel economy can be improved and stabilized The present invention provides a fuel cell system having an ejector built therein.

Fuel cell stack, ejector, end plate, fuel electrode manifold, hydrogen, recirculation

Description

Fuel cell system embedded ejector [0002]

The present invention relates to an ejector-mounted fuel cell system, and more particularly, to a fuel cell system with an ejector, more specifically, an ejector of a cartridge type is detachably incorporated in an end plate or a fuel electrode manifold to increase the hydrogen recirculation amount of the fuel electrode, To an Ejector built-in type fuel cell system capable of improving the overall performance of the fuel cell stack.

BACKGROUND ART A fuel cell system is a kind of power generation system that converts chemical energy of a fuel into direct electrical energy. The fuel cell system includes a fuel cell stack for generating electric energy, a fuel supply system for supplying fuel (hydrogen) to the fuel cell stack, An air supply system for supplying oxygen in the air, which is an oxidant required for the electrochemical reaction, a cooling system for removing the reaction heat of the fuel cell stack to the outside of the system and controlling the operation temperature of the fuel cell stack, and the like.

The main components of the fuel cell stack of the fuel cell system are shown in a cell unit. The electrolyte layer disposed on the innermost layer and the catalyst layer coated on both sides of the electrolyte layer to allow hydrogen and oxygen to react therewith, that is, An electrode film (MEA) made of an anode; A gas diffusion layer (GDL) stacked on an outer portion of the electrode film, that is, on an outer portion of the cathode and the anode; A separator having a flow field formed on the outside of the gas diffusion layer to supply fuel and discharge water generated by the reaction; An end plate made of a metal material and supported at the outermost sides by the combined surface pressure so as to support the above structures; .

The end plate is formed with an air supply port and an air discharge port, a cooling water port, a hydrogen supply port, a hydrogen recirculation (discharge) port, and the like as an inlet and an outlet through which air, hydrogen, and cooling water are supplied and recovered.

In addition, an air manifold and a hydrogen manifold are formed in the fuel cell stack along the stacking direction.

In particular, the fuel supply system connected to the fuel cell stack includes a hydrogen supply line (piping) supplied from a hydrogen reservoir, a hydrogen recirculation line (piping) in which unreacted hydrogen is recirculated in the fuel cell stack, a new hydrogen and recycle hydrogen And an ejector for pumping the fuel toward the fuel electrode of the fuel cell stack.

The ejector for the fuel cell injects compressed hydrogen supplied from a high-pressure tank through a nozzle to generate a vacuum, and uses the exhaust gas in the fuel cell stack to recirculate hydrogen gas by sucking exhaust gas.

The conventional ejector array structure will now be described.

First, a multiple ejector system in which several ejectors are connected to an end plate of a fuel cell stack by piping is adopted.

That is, as shown in FIG. 11, a plurality of ejectors are disposed between the fuel cell stack and the hydrogen tank, and the non-use of the plurality of ejectors is a multiple valve mechanism, such as a kind of valve, An ejector system has been adopted.

However, when a large number of ejectors are arranged and two or three of them are switched for use, it is necessary to install a separate switching mechanism and a backflow prevention mechanism, which complicates the piping line and its structure. There is a drawback that the overall installation space of the fuel cell system increases as each ejector is arranged outside the fuel cell stack.

Second, the ejector having the double nozzle is arranged outside the fuel cell stack and connected to the end plate of the fuel cell stack by the pipe.

That is, as shown in FIG. 12, an ejector having a double nozzle is disposed between the fuel cell stack and the hydrogen tank, and the double nozzle of the ejector is used to match the operating conditions of the fuel cell stack, A method of changing the information is adopted.

However, since the ejector having the double nozzle is arranged outside the fuel cell stack, the overall installation space of the fuel cell system increases.

In view of this point, the prior art has been proposed, in which the ejector itself is embedded in the end plate of the fuel cell stack.

As one example, Japanese Laid-Open Patent Application No. 2001-143734 discloses a technique in which an ejector is embedded in an end plate of a fuel cell stack. However, as the ejector is arranged along the stacking direction of the fuel cell stack, There is an unrealistic problem that must be made very thick over 200 mm.

In addition, considering the increase of the thickness of the end plate, if the ejector is made short, the pumping efficiency is very low. Therefore, the ejector built-in structure disclosed in Japanese Patent Application Laid-Open No. 2001-143734 can not be manufactured as an actual product .

As another example, U.S. Patent No. 3,982,961 discloses a technique in which an ejector is integrally formed in a fuel cell stack. As the ejector is integrally constructed, the mounting process is complicated and the ejector can not be replaced. There is a problem in that there is no separate reverse flow shut-off mechanism and the back flow of the supplied hydrogen is concerned.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art, and it is an object of the present invention to provide a fuel cell stack in which an ejector of a cartridge type which is easy to be detached and attached is mounted in an end plate (or a common distribution structure) The hydrogen recirculation system itself can be simplified and the volume and weight of the entire fuel cell system can be greatly reduced. As a result, the fuel cell system And an object thereof is to provide an injector built-in type fuel cell system capable of improving efficiency and improving fuel economy and stability.

According to an aspect of the present invention, a multi-stage serial cartridge ejector is detachably inserted into a fuel electrode manifold of a fuel cell stack extending from a high-pressure hydrogen supply port formed on one end plate to a hydrogen recirculation line formed on the other end plate. And the fuel cell system is provided with an Ejector built-in type fuel cell system.

Preferably, the multi-stage serial cartridge ejector includes first and second hollow coils hermetically coupled to an ejector body and an inlet and an outlet of the ejector body, respectively, wherein the ejector body is sequentially arranged in a line with a predetermined gap therebetween A plurality of nozzles having a relatively large diameter in the arrangement order from the inlet side to the outlet side; A plurality of sub-inlets communicating with gap spaces between the respective nozzles as intake passages for unreacted hydrogen in the fuel cell stack; A check valve mounted to each sub inlet to prevent high pressure hydrogen from flowing back to the outside; And a control unit.

In another preferred embodiment, the outlet side of the fuel electrode manifold and the hydrogen recirculation line are connected by a separate pipe, and a blower is mounted on the pipe.

According to another preferred embodiment of the present invention, a condensate recovery water trap and a purge valve are installed at a connection point between the fuel electrode manifold and the hydrogen recycle line.

In particular, the hydrogen inlet formed in the housing of the multi-stage serial cartridge ejector is connected to the hydrogen recirculation port, and the inlet and the outlet of the ejector body are connected to the high-pressure hydrogen supply port and the hydrogen supply port, respectively.

Through the above-mentioned means for solving the problems, the present invention provides the following effects.

1) By eliminating the external piping lines such as the fuel cell stack, the ejector, the hydrogen recirculation circuit, and the like, and utilizing the space of the fuel electrode manifold of the end plate or the fuel cell stack in the past to detachably incorporate one or more cartridge- , The shortening of the hydrogen recycle path and the pressure drop of the flow path can be reduced, thereby maximizing the hydrogen recycle amount.

2) In addition, the hydrogen recirculation system of the fuel cell system can be simplified to greatly reduce the volume / weight of the entire fuel cell system.

3) Ultimately, the ejector is embedded in the inside of the fuel cell system, not inside the outside of the fuel cell system, thereby maximizing the hydrogen recirculation amount, thereby improving fuel cell system efficiency and improving fuel economy and stability.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

First, in order to facilitate understanding of the present invention, a conventional ejector and a hydrogen recirculation line will be briefly described below.

As described above, the fuel cell system includes a fuel cell stack for generating electrical energy, a fuel supply system for supplying fuel (hydrogen) to the fuel cell stack, a fuel cell stack for supplying oxygen to the fuel cell stack, And a cooling system for removing the reaction heat of the fuel cell stack to the outside of the system and controlling the operating temperature of the fuel cell stack.

9, the fuel supply system, that is, the hydrogen supply system is a system that supplies hydrogen supplied from the compressed hydrogen tank 12 to the fuel cell stack 10 and maintains and controls the operation of the fuel cell system A low pressure regulator, a flow rate control actuator, an externally mounted ejector 14 mounted outside the fuel cell stack, and various sensors.

The external mounting type ejector 14 is connected between the hydrogen tank 12 and the fuel cell stack 10 and is also connected to the externally mounted type hydrogen recirculation line 16, Is injected through a nozzle to generate a vacuum, and recycles the unreacted gas of the fuel cell anode through the use of the vacuum.

Accordingly, the suction flow rate from the externally-disposed hydrogen recirculation line 16 side can be increased by the high-pressure hydrogen flow supplied to the fuel cell stack 10 through the externally mounted ejector 14. [

The fuel cell stack 10 is a power generation module of a fuel cell. The fuel cell stack 10 generates electricity through electrochemical reaction between air and hydrogen. The fuel cell stack 10 includes an air electrode, a fuel electrode, an MEA, a cooling channel, and the like as described above.

The externally placed hydrogen recirculation line 16 greatly influences the stability and efficiency of the overall system by facilitating the discharge of water from the stack in the fuel cell system and humidifying the supplied hydrogen, The larger the amount, the better the system is.

However, since the externally mounted type ejector 14 and the externally disposed type hydrogen recirculation line 16 are configured outside the fuel cell stack, there is a disadvantage in that the hydrogen recirculation line is elongated and at the same time does not maximize the recycle amount of hydrogen , And the external mounting type ejector 14 and the externally disposed type hydrogen recirculation line 16 use separate piping, so that the entire fuel cell system becomes large and complicated.

In view of this, the present invention is focused on maximizing the recirculation amount of hydrogen by embedding the ejector in the end plate or the anode manifold of the fuel cell stack, and in each of the preferred embodiments of the present invention And the present invention is not limited by the following examples.

First to Third Embodiment

2 is a schematic view showing a second embodiment, FIG. 3 is a schematic view showing a third embodiment, and FIG. 8A is a schematic view showing a third embodiment of the fuel cell system with an ejector according to the present invention. And FIG. 8B are a perspective view and a cross-sectional view showing a multi-stage serial cartridge ejector applied to each embodiment.

1 to 3, the end plate 18 of the fuel cell stack 10 is provided with an air supply port 20 and an air discharge port 22, a coolant supply and discharge port 24, 26, A hydrogen supply port 28, a hydrogen recycle (discharge) port 30, and a high-pressure hydrogen supply port 32 are formed.

Particularly, a multi-stage serial cartridge ejector 100 is detachably installed in the end plate 18, and the multi-stage serial cartridge ejector 100 is composed of a housing 102 and an ejector main body 104.

The first embodiment of the present invention is an example in which one of the multi-stage serial cartridge ejectors 100 is applied, the second embodiment is an example in which the two multi-stage serial cartridge ejectors 100 are applied, 40). Of course, two or more multi-stage serial cartridge ejectors 100 may be further arranged in parallel.

An inlet 106 through which the recycle hydrogen flows from the hydrogen recirculation port 30 is formed in the housing 102 of the multi-stage serial cartridge ejector 100.

1) or at least one ejector body 104 (see FIG. 2) are detachably disposed in parallel in the housing 102, and a rear end (inlet) of each ejector body 104 is connected to the ejector body 104, Pressure hydrogen supply port 32 formed in the end plate 18. The front end portion of the hydrogen supply port 28 is a passage for supplying high-pressure hydrogen and recycle hydrogen into the fuel cell stack 10, Lt; / RTI >

More specifically, as shown in FIG. 8A, an attachment hole 108 is formed in the housing 102 so that at least one ejector body 104 can be detachably inserted into the ejector body 104, (Inlet) at the time of mounting the ejector main body 104 to the high pressure hydrogen (not shown) formed on the end plate 18, And connects the front end portion (outlet) to the hydrogen supply port 28, which is a passage for supplying fresh hydrogen and recycle hydrogen into the fuel cell stack 10.

The ejector body will be described in detail with reference to FIG.

At least three or more nozzles 110a, 110b and 110c are sequentially arranged in a line with a predetermined gap as a configuration of the ejector main body 104. Each of the nozzles 110a, 110b, To be relatively large in diameter in accordance with their arrangement order.

A cover body 114 having at least three sub-intake ports 112a, 112b and 112c is mounted on the outer diameter of each of the nozzles 110a, 110b and 110c so that the nozzles 110a, 110b and 110c are fixed And the three sub-intake ports 112a, 112b, and 112c are in communication with the gap space between the respective nozzles 110a, 110b, and 110c.

Particularly, the three sub-intake ports 112a, 112b and 112c are equipped with a check valve 116 for preventing hydrogen, which is newly supplied to the hydrogen recirculation line, from flowing backward.

For example, a purge valve (reference numeral 13 in Fig. 9) installed in a line branched from a hydrogen recirculation line of a fuel cell stack is an ON / OFF valve, and discharges nitrogen or other by- The purge gas is discharged at the time of purging by nitrogen, hydrogen, water vapor, water, etc., and the number of times of on / off (ON / OFF) do.

When the hydrogen blower or the ejector for circulating the recirculating gas fails to function, the new fuel supply hydrogen supplied from the hydrogen tank at the time of opening the purge valve flows back to the recycle line without being supplied to the stack, .

The above-described ejector has excellent performance when a large flow quantity of the ejector is supplied to the nozzle by nature, and when the flow rate is small (for example, when idling with a small load, etc.), there is almost no suction effect from the recirculation line.

Therefore, the check valves 116 are mounted on the three sub-intake ports 112a, 112b, and 112c so that the new high-pressure hydrogen does not flow back into the hydrogen recirculation line.

In the present invention, a check valve 116 in the form of a shell type may be installed in each of the sub-intake ports 112a, 112b and 112c to prevent the supplied hydrogen from flowing back to the recirculation line when there is no suction function .

That is, when a vacuum is generated by the nozzles 110a, 110b, and 110c, a circular plate-shaped check valve 116 is pushed into the center of the ejector 100 to generate a gap, A check valve 116 in the form of a round plate cuts off each of the inlets 112a, 112b and 112c to supply freshly supplied hydrogen toward the recirculation line This prevents backflow.

Hereinafter, an operation of supplying hydrogen fuel to the fuel cell stack in a state in which one or more multi-stage serial cartridge ejectors are removably mounted on the end plate as described above will be described.

High-pressure hydrogen is supplied from the hydrogen tank 12 to the high-pressure hydrogen supply port 32 formed in the end plate 18 of the fuel cell stack 10. Unreacted hydrogen in the fuel cell stack 10 is supplied to the hydrogen recycle line To the hydrogen recirculation port (30) formed in the end plate (18).

1, high-pressure hydrogen supplied from the high-pressure hydrogen supply port 32 is supplied to the ejector main body 104 of the multi-stage serial cartridge ejector 100, and recirculated hydrogen is supplied to the hydrogen recirculation port 30, To the inlet 106 formed in the housing 102 of the multi-stage serial cartridge ejector 100.

At this time, when high-pressure hydrogen supplied to the ejector main body 104 is injected by the nozzles 110a, 110b, and 110c, vacuum pressure is applied to the inside of the ejector body 104, The recycle hydrogen flowing into the inlet 106 of the evaporator 102 is sucked into the ejector main body 104.

Thus, new fuel supply hydrogen (high-pressure hydrogen) and recycle hydrogen are mixed with each other and fed into the fuel cell stack 10 through the hydrogen supply port 28 of the end plate 18. [

The operation of the multi-stage serial cartridge ejector will be described in more detail as follows.

The multi-stage serial cartridge ejector 100 performs an amplifying operation to continuously increase the hydrogen sucking flow rate in each of the nozzles 110a, 110b, and 110c.

1) High pressure (about 1.5 to 10 barg) of dry hydrogen from the hydrogen tank 12 is injected at a high speed from the first-stage nozzle 110a.

2) The hydrogen injected from the first-stage nozzle 110a turns the first-stage nozzle portion into a vacuum (low-pressure) pressure state, and the check valve 116 is opened by this vacuum pressure, (Hydrogen, nitrogen, water vapor, etc.) discharged into the recirculation port 30 is sucked.

3) The first stage gas density is increased by the inhaled nitrogen and water vapor, and therefore, a larger vacuum pressure can be induced on the side of the second-stage nozzle 110b.

4) The first-stage passing gas still having a high pressure is re-injected into the second-stage nozzle 110b in the second stage to make a vacuum (low-pressure) pressure and the corresponding check valve 116 is opened to the second- Recirculated hydrogen is inhaled.

5) With the above-described principle, recirculated hydrogen is sucked into the three-stage sub inlet 112c while guiding a larger vacuum pressure in the third stage by the three-stage nozzle 110c.

6) The process of 1) ~ 5) is repeated at each step. The more the stages, the more the suction flow increases.

Thus, by incorporating one or more ejectors 100 in the end plate 18 of the fuel cell stack, the high-pressure hydrogen supplied from the hydrogen tank 12 and the negative pressure generated by the high- The recirculated hydrogen is mixed with each other and is easily supplied to the fuel cell stack 10 through the hydrogen supply port 28 of the end plate 18. [

That is, by the vacuum pumping action of the ejector 100 built in the end plate 12 of the fuel cell stack 10, the high-pressure supply hydrogen supplied from the hydrogen tank 12 and the high- The recycle hydrogen and the water vapor discharged to the stack outlet without chemical reaction are mixed with each other and supplied to the fuel cell stack, thereby shortening the hydrogen recycle path and reducing the pressure drop of the flow path, thereby maximizing the hydrogen recycle amount.

Hereinafter, the fourth to sixth embodiments of the present invention will be described.

Examples 4 to 6

FIG. 4 is a schematic view showing a fourth embodiment of the fuel cell system with an ejector built-in according to the present invention, FIG. 5 is a schematic view showing the fifth embodiment, and FIG. 6 is a schematic view showing the sixth embodiment.

The fourth to sixth embodiments focus on the point that the ejector 100 is embedded in the fuel electrode manifold 34 formed in the fuel cell stack 10 to maximize the recirculation amount by rapid sucking of the recycled hydrogen have.

According to the fourth to sixth embodiments, a high-pressure hydrogen supply port 32 is formed on one end plate of the end plate 18 of the fuel cell stack 10, and a hydrogen recycle line 36 is provided on the other end plate. .

At this time, the high-pressure hydrogen supply port (32) and the hydrogen recirculation line (36) are communicated with each other by the fuel electrode manifold (34) of the fuel cell stack (10).

Here, the multi-stage serial cartridge ejector 100 is removably inserted into the fuel electrode manifold 34.

The multi-stage serial cartridge ejector 100 includes an ejector body 104 and first and second hollow bars 118 and 120 hermetically coupled to an inlet and an outlet of the ejector body 104, respectively.

One side of the first hollow bar 118 serves as a high-pressure hydrogen supply port 32. The other side of the first hollow bar 118 is airtightly coupled to the inlet side of the ejector body 104 by an O- Is hermetically sealed by an O-ring 122 on the outlet side of the ejector main body 104, and the other side thereof is connected to the hydrogen recycle line 36. [

As described in the first to third embodiments, the ejector main body 104 is arranged in a line with a predetermined gap therebetween, and at least three ejector bodies 104 having a relatively large diameter in the order of arrangement from the inlet side to the outlet side And at least three sub-intake ports 112a, 110b, and 110c communicating with the gap spaces between the nozzles 110a, 110b, and 110c as the intake passages of unreacted hydrogen in the fuel cell stack 10, 112b and 112c and a check valve 116 mounted on each of the sub-intake ports 112a, 112b and 112c to prevent high-pressure hydrogen from flowing back to the outside.

Hereinafter, the operation of supplying hydrogen by the multi-stage serial cartridge ejector detachably installed in the fuel electrode manifold will be described.

High-pressure hydrogen is supplied from the hydrogen tank 12 to the high-pressure hydrogen supply port 32 formed in one end plate 18 of the fuel cell stack 10, and unreacted recirculation The product containing hydrogen is caused to flow toward the ejector 100 in the fuel electrode manifold 34.

The high pressure hydrogen supplied from the high pressure hydrogen supply port 32 is supplied to the ejector main body 104 of the multi-stage serial cartridge ejector 100 and the recycle hydrogen is supplied to the fuel electrode manifold 34 (112a, 112b, 112c) formed in the other side end plate (18)

At this time, when the high-pressure hydrogen supplied to the ejector main body 104 is injected by the nozzles 110a, 110b, and 110c, vacuum pressure is generated inside the sub inlet ports 112a, 112b, and 112c instantaneously, The check valve 116 is opened by pneumatic pressure, and a gas such as nitrogen, water vapor, or the like including recycled hydrogen is sucked into the ejector main body 104.

Accordingly, new fuel supply hydrogen (high-pressure hydrogen) and recycle hydrogen are mixed with each other and supplied to the fuel cell stack 100 through the hydrogen recirculation line 36 of the end plate 18. [

Since the specific operation of the ejector main body according to the third to sixth embodiments is the same as that described in the first to third embodiments, the description thereof will be omitted.

On the other hand, according to the third to sixth embodiments, by embedding the position of the ejector 100 in the fuel electrode manifold 34 (anode gas outlet manifold), it is possible to quickly absorb more of the recycle gas together with the high- The reason why the ejector is embedded in the fuel electrode manifold (anode manifold outlet manifold), which is the lowest pressure portion, is because the pressure distribution is uniformly distributed inside the stack and the flooding is unlikely to occur.

In addition, the change in the load of the fuel cell system requires an increase or a decrease in the supply variation of the hydrogen flow rate, and the recycle hydrogen absorption performance of the ejector is also a main factor of the response performance. According to the present invention, It is possible to exhibit very excellent recirculation hydrogen adsorption performance because it is disposed closest to the fuel electrode of the stack.

Further, according to the fourth to sixth embodiments of the present invention, since hydrogen recirculation is performed along the hydrogen recirculation line 36 formed in the ejector 100 and the end plate 18, that is, It is possible to control the temperature of the stack itself and the temperature of the cooling water constantly, thereby reducing the possibility of water condensation in the recirculation line. In particular, the discharge of condensate generated on the surface of the separator plate of the fuel cell stack, It contributes greatly to the voltage stability and can also provide an advantage of acting as a positive factor in the stack durability.

As described above, according to the third to sixth embodiments, the ejector 100 is embedded in the fuel electrode manifold 34, thereby shortening the recirculation path and reducing the pressure drop of the flow path, thereby maximizing the hydrogen recirculation amount, It is possible to greatly reduce the volume / weight of the entire fuel cell system.

According to the fifth embodiment of the present invention, the condensate water trap 38 and the purge valve 38 are disposed at the connection point between the fuel electrode manifold 34 and the hydrogen recirculation line 36 formed in the other end plate 18, (42) is mounted.

Accordingly, when the fuel cell system is stopped, the condensed water remaining in the stack fuel anode, the fuel electrode manifold 34, and the hydrogen recycle line 36 is discharged to the water trap 38, and a heterogeneous gas such as nitrogen is introduced into the purge valve 42, respectively.

According to the sixth embodiment of the present invention, the outlet side of the fuel electrode manifold 34 is connected to the hydrogen recirculation line 36 by a separate pipe 44, and a blower 46 is provided on the pipe 44, Can be mounted.

That is, the ejector 100 is built in the fuel electrode manifold 34, the fuel electrode manifold 34 and the hydrogen recycle line 36 are further connected to a separate pipe 44, 46).

Therefore, when the driving of the multi-stage serial cartridge ejector 100 and the driving of the blower 46 are performed at the same time, the amount of recirculation of the hydrogen discharged to the fuel electrode manifold 34 is increased to the hydrogen recirculation line 36 in a larger amount. So that the flow of the internal flow of the cells in the stack can be made uniform and the overall system stability can be achieved.

The fuel cell stack 10 in which the multi-stage serial cartridge ejector 100 is installed in the fuel electrode manifold 34 may be formed as a single module or a plurality of submodules 200 as shown in FIG. 7 Thus, the stack can be made as a submodule unit to increase the total output of the stack, and the stack can be easily broken / repaired.

1 is a schematic view showing a first embodiment of an ejector built-in fuel cell system according to the present invention,

2 is a schematic view showing a second embodiment of the fuel cell system with built-in ejector according to the present invention,

3 is a schematic view showing a third embodiment of the fuel cell system with built-in ejector according to the present invention,

4 is a schematic view showing a fourth embodiment of the fuel cell system with built-in ejector according to the present invention,

5 is a schematic view showing a fifth embodiment of the fuel cell system with built-in ejector according to the present invention,

6 is a schematic view showing a sixth embodiment of the fuel cell system with built-in ejector according to the present invention,

7 is a schematic view for explaining an example in which the fuel cell stack with built-in ejector according to the present invention is manufactured as a submodule,

8A and 8B are a perspective view and a cross-sectional view showing an ejector according to an embodiment of the present invention, showing a multi-stage serial cartridge ejector,

9 is a schematic diagram illustrating the fuel supply and hydrogen recirculation system of the fuel cell system,

10 is a schematic view for explaining the internal structure of the fuel cell stack,

11 and 12 are schematic views for explaining a conventional ejector array structure.

Description of the Related Art

10: Fuel cell stack 12: Hydrogen tank

13: purge valve 14: externally mounted ejector

16: externally disposed hydrogen recirculation line 18: end plate

20: air supply port 22: air discharge port

24: Cooling water supply port 26: Cooling water discharge port

28: hydrogen supply port 30: hydrogen recirculation port

32: high-pressure hydrogen supply port 34: fuel electrode manifold

36: Hydrogen recirculation line 38: Water trap

40: Double stack module 42: Purge valve

44: piping 46: blower

100: Multistage serial cartridge ejector 102: Housing

104: ejector main body 106: inlet

108: Installation holes 110a, 110b, 110c: Nozzles

112a, 112b, 112c: a sub inlet 114:

116: check valve 118: first hollow bar

120: second hollow bar 122: O-ring

Claims (5)

delete The multi-stage serial cartridge ejector is detachably inserted into the fuel electrode manifold of the fuel cell stack extending from the high-pressure hydrogen supply port formed on the one-side end plate to the hydrogen recirculation line formed on the other-side end plate, The multi-stage serial cartridge ejector includes first and second hollow coils hermetically coupled to an ejector body and an inlet and an outlet of the ejector body, respectively, The ejector body includes: A plurality of nozzles sequentially arranged in a line with a predetermined gap therebetween and having a relatively large diameter in the order of arrangement from an inlet side to an outlet side; A plurality of sub-inlets communicating with gap spaces between the respective nozzles as intake passages for unreacted hydrogen in the fuel cell stack; A check valve mounted to each sub inlet to prevent high pressure hydrogen from flowing back to the outside; Wherein the fuel cell system includes an injector-mounted fuel cell system. The method of claim 2, Wherein an outlet side of the fuel electrode manifold and the hydrogen recirculation line are connected to each other by a pipe, and a blower is mounted on the pipe. The method of claim 2, And a condensate water trap and a purge valve are installed at a connection point between the fuel electrode manifold and the hydrogen recirculation line. The method of claim 2, Wherein the hydrogen inlet formed in the housing of the multi-stage serial cartridge ejector is connected to the hydrogen recirculation port, and the inlet and the outlet of the ejector body are connected to the high-pressure hydrogen supply port and the hydrogen supply port, respectively.

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