Fuel cell membrane humidifier

Abstract

The content disclosed in the specification relates to a fuel cell membrane humidifier. The present invention relates to a membrane humidifier capable of maintaining high humidification efficiency and improving airtightness and assemblability between a main case coupled to a cartridge and an inlet case and an outlet case by bringing high-humidity gas discharged from a stack of hydrogen fuel cells into contact with an upper portion, a middle portion, and a lower portion of a hollow fiber membrane module without a dead zone as a whole, the membrane humidifier comprising: a main case; wherein an inflow section forming an inflow part for wet gas discharged from the fuel cell, an outflow section forming an outflow part for the gas, and at least one cartridge support part formed inside the main body between the inflow part and the outflow part are integrally formed; and a hollow fiber membrane cartridge having at least one outer flange formed on the outside of a cartridge case spaced apart from each other corresponding to the cartridge support part, in which a plurality of hollow fiber membrane modules are arranged inside the cartridge case, and in which the inflow section and the outflow section are structurally separated by means of the flange when assembled into the main case, the hollow fiber membrane cartridge comprises: an array of upstream and midstream distribution ports and downstream distribution ports formed on one side wall of the cartridge case; and an array of upstream discharge ports, midstream discharge ports, and downstream discharge ports formed on the other side wall of the cartridge case.

Description

Technical Field

[0001] The content disclosed in this specification relates to a fuel cell membrane humidifier, which allows the high-humidity gas exhausted from the stack of hydrogen fuel cells to contact the upper, middle and lower parts of the hollow fiber membrane module without dead zones as a whole, thereby maintaining high humidification efficiency and improving the airtightness and assemblability between the main shell and the inlet shell and the outlet shell that match the box. Background Art

[0002] Unless otherwise expressed in this specification, the contents described in this section are not prior art to the claims of this application and are not admitted to be prior art even if included in this section.

[0003] Generally, hydrogen fuel cells that utilize electricity generated by the reaction of hydrogen fuel and oxygen are being developed into various types such as polymer electrolyte fuel cells, polymer electrolyte fuel cells (PEMFC), phosphoric acid fuel cells (PAFC), and dual exchange membrane fuel cells.

[0004] It is known that in the case of polymer electrolyte fuel cells, compared with other fuel cells, they operate at low temperatures and have a higher power density, so they can be miniaturized. Therefore, they are expected to be used not only in small-scale stationary power generation equipment but also in transportation equipment such as hydrogen-powered vehicles.

[0005] One of the most important factors in improving the performance of polymer electrolyte fuel cells is to supply a certain amount of water to the polymer electrolyte membrane (PEM) [also called proton exchange membrane (PEM)] (PEM) of the membrane-electrode assembly (MEA) inside the stack of the fuel cell to maintain the moisture content. This is because if the polymer electrolyte membrane dries, the power generation efficiency will drop sharply.

[0006] The performance of a fuel cell is greatly affected by the moisture content of the gas supplied to the stack, and therefore, a membrane humidification technology for humidifying the gas to maintain the moisture content or humidity of the supplied gas at a desired level is critically required.

[0007] As one of the prior arts, Korean Patent Publication No. 10-2019-0138529 discloses a fuel cell membrane humidifier using a humidification system using a hollow fiber membrane.

[0008] The existing fuel cell membrane humidifier described above is constructed to include: an intermediate shell, which accommodates a plurality of hollow fiber membranes; a cap shell, which is combined with the above-mentioned intermediate shell; a potting portion, which is formed at the ends of the above-mentioned plurality of hollow fiber membranes; an assembling component, which is arranged between the above-mentioned cap shell and the end of the above-mentioned intermediate shell to make them airtightly combined; and a protrusion, which extends from the inner side of the above-mentioned cap shell to the edge side of the above-mentioned potting portion to make the above-mentioned cap shell and the above-mentioned potting portion airtightly combined.

[0009] The above-mentioned fuel cell membrane humidifier constitutes an assembly structure, which is configured by arranging assembly components between the ends of the cap shell and the intermediate shell, and the protrusion extends from the inner side of the above-mentioned cap shell to the edge side of the above-mentioned potting part between the cap shell and the potting part, so as to achieve an airtight function in a high temperature / high pressure / humid environment.

[0010] However, the existing membrane humidifier described above has a problem of poor overall humidification efficiency because the contact between the gas flowing in from the stack and the hollow fiber membrane is concentrated on the inlet side of the intermediate shell, resulting in the formation of a dead zone at the lower part of the intermediate shell, and the humidification efficiency of the inflowing gas is weakened in the dead zone.

[0011] On the other hand, in addition to the airtightness between the casings and the box constituting the membrane humidifier, assemblability is also a very important factor for improving the production efficiency and humidification efficiency of the membrane humidifier, and various research and development attempts related to this are being made. Summary of the invention

[0012] (Problems to be solved by the invention)

[0013] The object of the disclosed invention is to provide a fuel cell membrane humidifier, which allows the high-humidity gas discharged from the stack of hydrogen fuel cells to form a path in the main shell that contacts the upper, middle and lower parts of the hollow fiber membrane module as a whole without dead zones, and can fully humidify the air supplied to the stack.

[0014] In addition, the disclosed invention aims to provide a fuel cell membrane humidifier having a structure that facilitates airtightness and assemblability between a housing for a membrane humidifier and a cartridge in order to achieve productivity and humidification efficiency in manufacturing the membrane humidifier.

[0015] (Measures taken to solve the problem)

[0016] According to one feature of the disclosed invention, a membrane humidifier is provided, the membrane humidifier comprising:

[0017] a main housing, wherein an inflow section forming an inflow portion for humid gas discharged from a fuel cell, an outflow section forming an outflow portion for the gas, and at least one cartridge support portion formed inside the main body between the inflow portion and the outflow portion are formed integrally; and,

[0018] A hollow fiber membrane cartridge having at least one outer flange formed on the outer side of the cartridge housing and spaced apart from the cartridge support portion, wherein a plurality of hollow fiber membrane modules are arranged inside the cartridge housing, and when assembled into the main housing, the inflow section and the outflow section are structurally isolated by means of the flange.

[0019] The hollow fiber membrane box has:

[0020] an arrangement of an upstream dispensing port, a midstream dispensing port and a downstream dispensing port formed on a side wall of the box housing; and,

[0021] The upstream outlet, the midstream outlet, and the downstream outlet are arranged on the other side wall of the cartridge housing.

[0022] The distribution ports are arranged in multiple layers in such a way that the opening area gradually increases from upstream to downstream.

[0023] The discharge port is formed in a plurality of multi-layer arrangements so that the opening area gradually increases from the downstream to the upstream.

[0024] Another feature of the invention according to one embodiment is to provide a fuel cell membrane humidifier, wherein a middle seal is coupled to the outer side of the outer flange of the cartridge, and the middle seal maintains airtightness with respect to the supporting portion of the main housing.

[0025] According to another feature of the invention of one embodiment, a fuel cell membrane humidifier is provided, wherein step seals are formed at both side ends of the hollow fiber membrane box, and the step seals maintain the airtightness between the box and the outlet shell and the inlet shell.

[0026] According to another feature of the invention of one embodiment, there is provided a fuel cell membrane humidifier, wherein the arrangement of the distribution ports is configured to include through holes whose opening areas become larger as they are farther away from the inflow section.

[0027] According to another feature of the invention of one embodiment, there is provided a fuel cell membrane humidifier, wherein the arrangement of the discharge ports is configured to include through holes whose opening areas decrease as they are farther away from the outflow section.

[0028] According to another feature of an embodiment of the invention, there is provided a fuel cell membrane humidifier, wherein the step seal is configured to include any one of a V-shaped seal, an O-ring, and a face seal.

[0029] According to another feature of the invention of one embodiment, the main housing further includes a gasket provided at one end portion of the main housing, wherein the gasket provides airtightness with respect to the inlet housing.

[0030] According to another feature of the invention of one embodiment, there is provided a fuel cell membrane humidifier, which is further configured to include a gasket provided at the other end of the main housing, the gasket providing airtightness with respect to the outlet housing.

[0031] (Effects of the Invention)

[0032] According to an embodiment disclosed in the present specification, from the upstream side to the midstream side and the downstream side of the box, the humid gas circulates in the hollow fiber membrane module through the distribution port and the discharge port arrangement structure having different opening areas, thereby having the advantage of providing maximum humidification efficiency for the dry compressed air passing through the inside of the box and the hollow fiber membrane without dead zones.

[0033] In addition, according to an embodiment disclosed in the present specification, a structural isolation state is formed by the second outer flange of the box, thereby having the advantage of stably maintaining the inflow flow of the humidified gas filled into the inflow section and the discharge flow of the humidified gas formed in the outflow section.

[0034] In addition, according to an embodiment disclosed in the present specification, a simple structural assembly element is formed not only between the box body and the main shell, but also between the inlet shell and the outlet shell, thereby having the benefit of maintaining strong airtightness after replacement and assembly.

[0035] In addition, according to the various embodiments disclosed in this specification, the additional secondary epoxy resin potting and drying process required when the box or hollow fiber membrane module (hollow fiber membrane filter) is damaged or A / S occurs is eliminated, thereby providing the advantages of rapid replacement and assembly operations and cost savings.

[0036] Furthermore, the effects of the present invention described in this way are of course exerted by the composition of the described contents regardless of whether the inventor is aware of them or not, and therefore the above-mentioned effects are merely several effects based on the described contents and should not be considered to record all the effects that the inventor has grasped or actually exists.

[0037] In addition, the effects of the present invention should be further understood through the entire description of the specification. Even if there is no explicit description, as long as ordinary technicians in the technical field to which the recorded content belongs can identify the effects through this description, they should also be regarded as the effects recorded in this specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a cross-sectional view of a fuel cell membrane humidifier according to one embodiment of the invention disclosed in this specification.

[0039] Figure 2 It is an exploded perspective view showing the connection relationship between the cartridge and the sealing member element in one embodiment of the present invention.

[0040] Figure 3 1 is a working state diagram of a fuel cell membrane humidifier according to an embodiment of the present invention.

[0041] Figure 4 It is an enlarged view of the main parts illustrating the mating state of the seals of the main housing, the inlet housing and the outlet housing according to one embodiment of the present invention.

[0042] Figure 5 As Figure 4 FIG. 1 is an enlarged view of a main part of a V-seal of one embodiment of a step seal shown in FIG.

[0043] Figure 6 FIG. 1 is an enlarged view of a main part illustrating an O-ring coupling structure according to another embodiment of the present invention.

[0044] FIG. 7 is an enlarged view of a main part illustrating a face seal coupling structure according to still another embodiment of the present invention. DETAILED DESCRIPTION

[0045] Hereinafter, the configuration, operation, and effect of the fuel cell membrane humidifier according to the preferred embodiment will be observed with reference to the accompanying drawings. For reference, in the following drawings, for the sake of convenience and clarity, each component is omitted or schematically illustrated, and the size of each component does not reflect the actual size. In addition, throughout the specification, the same reference numerals refer to the same components, and in individual drawings, the reference numerals for the same components will be omitted.

[0046] Figure 1 is a cross-sectional view of a fuel cell membrane humidifier according to one embodiment of the invention disclosed in this specification, Figure 2 is an exploded perspective view illustrating the combined relationship between the box and the sealing element in one embodiment of the present invention, Figure 3 is a working state diagram of a fuel cell membrane humidifier according to an embodiment of the present invention, Figure 41 is an enlarged view of the main part illustrating the mating state of the seals of the main housing, the inlet housing and the outlet housing according to one embodiment of the present invention, Figure 5 As Figure 4 An enlarged view of the main part of a V-seal of an embodiment of a step seal shown in FIG. Figure 6 FIG. 7 is an enlarged view of a main part illustrating an O-ring coupling structure according to another embodiment of the present invention. FIG. 8 is an enlarged view of a main part illustrating a face seal coupling structure according to still another embodiment of the present invention.

[0047] The fuel cell membrane humidifier according to one embodiment of the present invention has an assembly structure in which the hollow fiber membrane box 200 is inserted into the inner side of the main housing 100 in a sliding manner during assembly and each flange is respectively placed on a support portion provided inside the main housing 100.

[0048] More specifically, refer to Figure 1 and Figure 2 The main housing 100 includes an inflow section 3 forming an inflow portion 1 for humid gas discharged from the fuel cell, an outflow section 4 forming an outflow portion 2 for the humid gas, and at least one box support portion 5 formed inside the main body 10 between the inflow portion 1 and the outflow portion 2. The inflow portion 1, the outflow portion 2 and the box support portion 5 are formed as a whole by molding.

[0049] The inflow section 3 forms a flow space into which moist gas or water vapor having high pressure and high humidity, which is usually formed in a hydrogen fuel cell, flows through the inflow portion 1 .

[0050] The outflow section 4 forms a flow space in which the moist air circulates inside a box housing 30 described below and fully contacts the hollow fiber membranes, and then flows to the outside of the box and is discharged.

[0051] The above-mentioned box support part 5 is constructed to include: a first support part 5a, which is bolted to the upper part of the box shell 20; a second support part 5b, which is separated from the first support part 5a to the central side in the length direction and restricts the lateral movement of the above-mentioned box shell 30; and a third support part 5c, which is embedded in and fixed to the lower part of the above-mentioned box shell 20.

[0052] The second support portion 5b includes a stepped structure protruding toward the inside of the body 10. The third support portion 5c includes a flange insertion groove 6.

[0053] The lateral movement of the box shell 20 mentioned above can be explained as the force exerted on the box shell 20 and the tiny movement generated by the box shell 20 depending on the fluid pressure applied to the box shell 20 when the high-pressure humid gas flows into the above-mentioned inflow section 3.

[0054] In addition, the lateral movement of the box body 20 mentioned above can be explained as the external force applied to the box body 20 and the resulting small movement corresponding to the flow direction formed along the direction from the above-mentioned inflow section 3 to the outflow section 4 in the absence of the support portion 5a, 5b or 5c.

[0055] The inlet housing 30 is coupled to the outflow section 4 side of the main housing 100 and guides the inflow of external air which is relatively dry compared to the humid gas.

[0056] Normally, the inlet casing interior 30 is supplied with external air supplied by a compressor, and the external air flows in a high-temperature dry state.

[0057] The outlet casing 30 includes a cooler 31 provided therein and is configured to guide the outside air into the hollow fiber membrane module in the box.

[0058] The cooler 31 performs a function of maintaining the outside air at a preset appropriate temperature. At this time, the outside air is still in a dry state.

[0059] On the other hand, the outlet housing 40 is coupled to the inflow section 3 side of the main housing 100 and includes an inlet 41 for introducing humid gas supplied from the hydrogen fuel cell side and an outside air discharge portion 42 adjacent to the inlet 41 .

[0060] The outside air discharge portion 42 of the outlet case 40 forms a path for supplying humidified air that has passed through the membrane region of the hollow fiber membrane module and has been sufficiently humidified to the inside of the hydrogen fuel cell stack.

[0061] On the other hand, refer to Figure 2 According to one embodiment of the present invention, the box shell 20 has at least one outer flange 21 separated from the box support portion 5 of the main shell 100 and formed on the outside of the box shell 20, and a plurality of hollow fiber membrane modules are arranged inside the box shell 20.

[0062] When assembled into the main housing 100 , the inflow section 2 and the outflow section 4 are structurally isolated by the flange 21 .

[0063] Preferably, the outer flange 21 is configured to include a first outer flange 21 a constrained to the first support portion 5 a during assembly and a second outer flange 21 b constrained to the second support portion 5 b .

[0064] The inflow section 2 and the outflow section 4 formed on the outer side of the box housing 20 form predetermined chambers that are structurally separated or partitioned from each other by means of the second outer flange 21b constrained by the second support portion 5b.

[0065] During the flow of the humid air, the humid air flowing into the section 2 is guided from one side of the second outer flange 21 b to be induced to the hollow fiber membrane side inside the cassette case 20 .

[0066] On the contrary, the moist air of the outflow section 2 is guided from the other side of the second outer flange 21 b and induced to the outflow portion 2 or the discharge portion side.

[0067] The hollow fiber membrane box according to the present invention is constructed to include: a distribution port arrangement 22, which includes an upstream distribution port 22a, a midstream distribution port 22b and a downstream distribution port 22c formed on one side wall of the box shell 10; and an outlet arrangement 23, which includes an upstream outlet 23a, a midstream outlet 23b and a downstream outlet 23c formed on the other side wall of the above-mentioned box shell 10.

[0068] The distribution ports 22a, 22b, 22c are arranged in multiple layers so that the opening area gradually increases from upstream to downstream. For example, as shown in the figure, the number of through holes gradually increases toward the downstream distribution port 22c compared with the upstream distribution port 22a.

[0069] The distribution port array 22 is configured to include through holes whose opening areas increase as they are farther from the inflow section 2 .

[0070] Although not shown in the figure, as other modified embodiments, the upstream distribution port 22a, the midstream distribution port 22b and the downstream distribution port 22c can respectively have through hole structures with different opening areas, and can undergo various geometric deformations including circular holes, triangular holes, and rectangular holes.

[0071] On the other hand, the outlets 23a, 23b, and 23c are arranged in multiple layers so that the opening area gradually increases from upstream to downstream. For example, as shown in the figure, the through-hole structure may have a gradually increasing number closer to the upstream outlet 23a than the downstream outlet 23c.

[0072] The discharge port arrays 23 a , 23 b , and 23 c are configured to include through holes whose opening areas decrease as they become farther from the outflow section 4 .

[0073] Although not shown in the figure, as other modified embodiments, the upstream outlet 23a, the midstream outlet 23b and the downstream outlet 23c can respectively have through hole structures with different opening areas, and can be subjected to various geometric deformations including circular holes, triangular holes, and rectangular holes.

[0074] Of course, the aforementioned hollow fiber membrane cassette is constructed to include a plurality of through holes 24 at the upper and lower portions of the cassette housing 10 to communicate with the interior of the hollow fiber membrane.

[0075] On the other hand, according to one embodiment of the present invention, a middle seal is combined with the outer side of the second outer flange 21 b of the cassette housing 20 .

[0076] Preferably, the intermediate seal is combined with the outer side of the second outer flange of the box, and the intermediate seal is used to maintain airtightness with respect to the supporting portion of the main housing.

[0077] The second outer flange 21 b combined with the intermediate seal 50 maintains an airtight state in which the inflow section 2 and the outflow section 4 formed on the outer side of the box housing 10 are structurally sufficiently separated during assembly.

[0078] Step seals 60 are formed at both side ends of the box housing 20 to maintain airtightness with the outlet housing 30 and the inlet housing 40 during assembly.

[0079] The step seal 60 is a structure that provides rapid replacement and assembly operations and cost-saving economy through simple seal assembly when the box or hollow fiber membrane module (hollow fiber membrane filter) is damaged or A / S occurs, without the need for additional epoxy resin potting and drying processes.

[0080] Incidentally, the membrane humidifier of the present invention having the aforementioned step seal 60 eliminates the complicated secondary potting and drying process required in the replacement operation of the cartridge and the hollow fiber membrane filter in the past, thereby significantly reducing the replacement operation man-hours.

[0081] Preferably, if Figure 4 As shown, the step seal 60 structurally includes a V-shaped seal or a lip seal 60a, which is respectively formed at one side connection portion and the other side connection portion of the box housing 20. Therefore, the airtightness between the inlet housing 30 and the outlet housing 40 assembled on both sides of the box housing 20 is maintained without the need for additional potting and drying processes.

[0082] According to another embodiment of the present invention, Figure 5 and Figure 6 As shown, the step seal 60 can be deformed into an O-ring 60b or a face seal 60c. Depending on the seal performance and required specifications, it can selectively form the aforementioned V-shaped seal (lip seal) or any one of the O-ring and face seal.

[0083] On the other hand, a gasket 70 a is formed at one end portion of the main housing 10 , and the gasket 70 a provides a strong airtight seal to the inlet housing 40 .

[0084] A gasket 70 b may be further formed at the other end of the main housing 70 . In this case, the gasket 70 b provides airtightness to the outlet housing 30 .

[0085] Modes for carrying out the invention

[0086] The operating principle of the fuel cell membrane humidifier according to the present invention is described below.

[0087] Reference Figure 3 , the humid gas generated in the hydrogen fuel cell stack is supplied to the interior through the humid gas inflow hole 41 of the outlet shell 40.

[0088] The supplied humid gas first fills the space between the inside of the main shell 10 and the outer flange of the box shell 20, for example, first fills the inflow section 3 of the main shell 10 formed outside the second outer flange 21b.

[0089] At this time, a structural isolation state is formed by means of the second outer flange 21 b of the cartridge case 20 , thereby stably maintaining the inflow flow of the humidified gas filled in the inflow section 3 .

[0090] Typically, the humid gas supplied from the hydrogen fuel cell stack is provided in the form of a predetermined high-pressure water vapor, and the humid gas filled in the inflow section 3 flows into the interior of the hollow fiber membrane module through the upstream distribution port 22a, the midstream distribution port 22b and the downstream distribution port 22c which are sequentially provided on a side wall of the box shell 10.

[0091] During this process, the supplied humid gas flows into the interior of the hollow fiber membrane module through the side flow path (F1 to F3) formed by the distribution port arrangement 22, wherein the distribution port arrangement 22 is arranged in a manner having an opening area (e.g., a through hole diameter) that gradually increases from the upstream side to the downstream side of the box body 10.

[0092] The humidified gas introduced through the above-mentioned inflow paths (F1 to F3) forms a predetermined circulation flow and vortex between the upper, middle and lower regions of the hollow fiber membrane in the cartridge housing 20 (see Figure 3 The spiral arrow on the right shows the direction of the discharge port.

[0093] Finally, the humidified gas passes through the hollow fiber membrane without dead zones not only in the upper and lower parts but also in the two sides thereof, and then reaches the outflow section 4 through the outlets 23a, 23b, and 23c, and then proceeds through the outflow portion 2, wherein the outlets 23a, 23b, and 23c are arranged in a manner having an opening area (for example, a through hole diameter) that gradually increases from the downstream side to the upstream side of the box shell 10.

[0094] In this process, a structural isolation state is formed by the second outer flange 21 b of the cartridge housing 10 , thereby also stably maintaining the discharge flow of the humidified gas formed in the outflow section 4 .

[0095] On the other hand, the dry external air introduced from the inlet shell 30 side is fully humidified without dead zones through the hollow fiber membrane in a state where the moisture of the humidified gas has been filtered, so that the fully humidified air (referring to the humidified compressed air) passes through the external air outflow portion 42 of the outlet shell and is provided to the hydrogen fuel cell.

[0096] In this way, the fuel cell membrane humidifier according to the present invention enables the humidified gas to form uniform contact with the top-middle-bottom arrangement of the hollow fiber membrane module as a whole, thereby forming a sufficient humidification effect without dead zones for the dry compressed air entering from the inlet shell, thereby achieving maximized humidification efficiency.

[0097] In the description of the present invention, in the aforementioned circulating airflow or vortex humid gas flow process, the moisture filtering effect of the hollow fiber membrane (membrane field) is well known, so detailed description is omitted.

[0098] Although the preferred embodiment of the present invention is described above with reference to the accompanying drawings, the embodiments described in this specification and the structures illustrated in the accompanying drawings are only the best embodiments of the present invention and do not fully represent the technical ideas of the present invention. Therefore, it should be understood that there are various equivalents and modifications that can replace them at the time of this application. Therefore, it should be understood that the embodiments described above are illustrative rather than restrictive in all aspects, and the scope of the present invention is more expressed by the attached claims than the specification, and the meaning and scope of the claims and all changes or deformations derived from their equivalent concepts should be interpreted as being included in the scope of the present invention.

[0099] (Industrial Applicability)

[0100] The fuel cell membrane humidifier according to the present invention enables the high-humidity gas exhausted from the stack of hydrogen fuel cells to contact the upper, middle and lower parts of the hollow fiber membrane module without dead zones as a whole, thereby maintaining high humidification efficiency and helping to improve the airtightness and assembly performance between the main shell combined with the box and the inlet shell and outlet shell.

Claims

1. A fuel cell membrane humidifier, characterized in that: include: a main body housing in which an inflow section forming an inflow portion for humid gas exhausted from the fuel cell and an outflow section forming an outflow portion for the gas, and at least one cartridge support portion formed inside the main body between the inflow portion and the outflow portion are formed integrally; and A hollow fiber membrane cassette having at least one outer flange formed on the outer side of the cassette shell and spaced apart from the cassette support portion, wherein a plurality of hollow fiber membrane modules are arranged inside the cassette shell, and when assembled into the main shell, the inflow section and the outflow section are structurally isolated by means of the flange. The hollow fiber membrane box has: an arrangement of an upstream dispensing port, a midstream dispensing port, and a downstream dispensing port formed on a side wall of the cartridge housing; and The upstream outlet, the midstream outlet, and the downstream outlet are arranged on the other side wall of the cartridge housing. The distribution ports are arranged in multiple layers in such a way that the opening area gradually increases from upstream to downstream. The discharge port is formed in a plurality of multi-layer arrangements so that the opening area gradually increases from the downstream to the upstream.

2. The fuel cell membrane humidifier according to claim 1, characterized in that: A middle seal is coupled to the outer side of the outer flange of the box, and the middle seal maintains airtightness with respect to the supporting portion of the main housing.

3. The fuel cell membrane humidifier according to claim 1, characterized in that: The step seals are formed at both side ends of the hollow fiber membrane box, and the step seals maintain airtightness between the box and the outlet housing and the inlet housing.

4. The fuel cell membrane humidifier according to claim 1, characterized in that: The arrangement of the distribution ports is configured to include through holes whose opening areas increase as they are farther from the inflow section.

5. The fuel cell membrane humidifier according to claim 1, characterized in that: The discharge ports are arranged to include through holes whose opening areas decrease as they are farther from the outflow section.

6. The fuel cell membrane humidifier according to claim 3, characterized in that: The step seal is configured to include any one of a V-shaped seal, an O-ring, and a face seal.

7. The fuel cell membrane humidifier according to any one of claims 1 to 6, characterized in that: The main housing is further configured to include a gasket disposed at one end portion of the main housing, wherein the gasket provides airtightness with respect to the inlet housing.

8. The fuel cell membrane humidifier according to claim 7, characterized in that: The main housing is further configured to include a gasket provided at the other end portion of the main housing, wherein the gasket provides airtightness with respect to the outlet housing.

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