JP2007207610A - Humidifier for fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a humidifier for a fuel cell capable of enhancing humidifying efficiency by devising the shape of a hollow fiber module. <P>SOLUTION: The humidifier for the fuel cell is equipped with a hollow fiber membrane module 6 formed by housing a hollow fiber membrane bundle 4 formed by bundling a plurality of hollow fiber membranes 13 in a cylindrical case 5, oxidant gas is passed through a first passage passing the inside of the hollow fiber membrane 13, an exhaust gas is passed through a second passage passing from a gas exhaust hole 7B formed in a case wall to the outside of the case through the outside of the membrane of the hollow fiber membrane 13 from a gas introduction hole 7A formed in the case, and dried oxidant gas is humidified with exhaust gas containing moisture exhaust from the fuel cell, and a solid fiber bundle 17 comprising moisture absorbing exothermic fibers is installed in almost the central part of the hollow fiber membrane bundle 4, and the hollow fiber membrane 13 in the central portion is closely adhered to the case inner wall 5b of the case 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fuel cell humidifier, and more particularly to a technique for improving humidification efficiency.

  In a water permeable humidifier that humidifies dry oxidant gas with exhaust gas containing moisture discharged from the fuel cell and supplies the humidified gas to the fuel cell, moisture introduced from the gas introduction hole formed in the wall of the case Without passing through the hollow fiber membrane bundle, the exhaust gas containing the hollow fiber membrane bundle in which a plurality of hollow fiber membranes are bundled and directly from the gap formed between the case housing the hollow fiber membrane bundle There is a problem that the oxidant gas that flows to the gas discharge hole and is not sufficiently humidified.

  In order to solve this problem, a thick wall portion with a thickened inner wall of the case as a sealing member, an O-ring, or an annular convex portion is provided at a position away from the gas introduction hole and the gas discharge hole. The provided technique is proposed (for example, refer patent document 1 etc.).

In the technique described in Patent Document 1, since the gap between the case and the hollow fiber membrane bundle is sealed by the sealing member, gas passing through the gap can be prevented, so that the humidification performance can be improved.
JP 2004-6099 A

  By the way, in the humidifying device described in Patent Document 1, it is necessary to provide a thick wall part in which a part of the case inner wall is thickened, to provide an O-ring on the case inner wall, or to provide an annular convex part on the case inner wall. Have difficulty. In particular, providing a thick wall part or an annular convex part projecting inside a part of the inner wall of the case is an undercut part (from the mold) in the injection molding technology in which resin is injected into the mold. It is difficult to manufacture because the shape part cannot be released.

  Moreover, in the humidification apparatus of patent document 1, since the sealing member is provided in the case inner wall so that it may protrude inside, the space for humidification is wasted by the amount of the sealing member, and the humidification efficiency is improved. Hinder.

  Then, this invention is proposed in view of the above-mentioned actual condition, and it aims at providing the humidification apparatus of the fuel cell which can aim at the improvement of humidification efficiency by devising the shape of a hollow fiber membrane module.

  The present invention includes a hollow fiber membrane module that accommodates a hollow fiber membrane bundle formed by bundling a plurality of hollow fiber membranes in a cylindrical case, and circulates an oxidant gas in a first flow path that passes through the inside of the hollow fiber membrane. And the exhaust gas is circulated from the gas introduction hole formed in the case wall to the second flow path that circulates outside the hollow fiber membrane from the gas discharge hole formed in the case wall to the outside of the case, A humidifier for a fuel cell that humidifies a dry oxidant gas with an exhaust gas containing moisture discharged from the fuel cell, and a solid fiber bundle made of moisture-absorbing heat-generating fibers is provided in the hollow fiber membrane module, and its moisture-absorbing heat generation Either a solid fiber bundle made of fibers or the hollow fiber membrane bundle is in close contact with the inner wall of the case.

  According to the humidifier of the present invention, a solid fiber bundle made of hygroscopic heat generating fibers is provided in the hollow fiber membrane module, and either the solid fiber bundle made of the hygroscopic heat generating fibers or the hollow fiber membrane bundle is in close contact with the inner wall of the case. Therefore, it is possible to prevent the exhaust gas containing moisture introduced from the gas introduction hole from flowing directly to the gas discharge hole without passing through the hollow fiber membrane bundle, and humidify the gas to the center of the hollow fiber membrane bundle. Efficiency can be improved.

  The hygroscopic exothermic fiber generates heat of hydration when the fiber absorbs moisture, and has a high exothermic function. The fiber has a large number of hydrophilic groups, and heat is generated by the hydration reaction between the hydrophilic groups and water. The moisture-absorbing exothermic fiber is regenerated to its original state by drying.

  If a solid fiber bundle composed of moisture-absorbing heat-generating fibers having such characteristics is provided in the hollow fiber membrane module, it generates heat when it absorbs moisture (condenses), and the oxidant that supplies the fuel cell with that heat The gas temperature of gas can be raised and humidification efficiency can be improved. In addition, the fuel cell has a small amount of power generated by the fuel cell stack at low temperature startup or immediately after startup after being left for a long time, so wet air does not come to the exhaust gas side. In order to collect the water contained in the solid fiber bundle, the dried oxidant gas can be humidified.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

“First Embodiment”
FIG. 1 is a block diagram showing an example of a fuel cell humidifier in the first embodiment. FIG. 2 is a longitudinal sectional view of the humidifier shown in FIG. ) Is an enlarged perspective view of the main part showing the end shape of the hollow fiber membrane bundle housed in the housing case, FIG. 3B is an enlarged perspective view of the main part of the hollow fiber membrane, and FIG. 4 is the arrangement of the hollow fiber membrane bundle. It is a longitudinal cross-sectional view of the humidification apparatus broken and shown to the part to be performed.

  In the fuel cell 2 connected to the humidifying device 1 of the present embodiment, an anode to which hydrogen gas is supplied and a cathode to which oxygen-containing air (oxidant gas) is supplied include an electrolyte / electrode catalyst composite (membrane). A power generation cell stacked with an electrode assembly (MEA: membrane electrode assembly) in between is formed into a multi-layered stack structure, and chemical energy is converted into electrical energy by an electrochemical reaction.

  At the anode, the supplied hydrogen dissociates into hydrogen ions and electrons, the hydrogen ions pass through the electrolyte, the electrons pass through an external circuit to generate electric power, and move to the cathode. At the cathode, oxygen in the supplied air reacts with the hydrogen ions and the electrons to generate water, which is discharged to the outside.

  For example, a solid polymer electrolyte is used as the electrolyte of the fuel cell 2 in consideration of high energy density, low cost, light weight, and the like. The solid polymer electrolyte is made of an ion conductive polymer membrane such as a fluororesin ion exchange membrane, and functions as an ion conductive electrolyte when saturated with water. Therefore, the fuel cell 2 supplies water. Therefore, it is necessary to humidify the supply gas (oxidant gas).

  As shown in FIG. 1, the humidifier 1 is generally pressurized and heated by an exhaust gas (swelling air) rich in water vapor discharged from the cathode of the fuel cell 2 and a compressor 3 as an air introduction unit. The water permeation type humidifier used in the present invention is a hollow fiber using a hollow fiber membrane as a water permeation membrane. A membrane module (a hollow fiber membrane bundle and a case for housing it) is provided.

  In the water permeable membrane humidifier 1 configured as described above, for example, when wet air containing moisture is supplied into the hollow fiber membrane, moisture is contained in the pores (capillaries) formed in the hollow fiber membrane. Is condensed (capillary condensation) and separated, and moisture permeates from the inside to the outside of the hollow fiber membrane due to the water vapor partial pressure difference with the dry gas (dried oxidant gas) supplied to the outside of the hollow fiber membrane. The permeated moisture is humidified by contacting and evaporating with the dry gas supplied to the outside of the hollow fiber membrane bundle.

  In terms of moisture permeation, water exchange is performed both in the case where wet air is allowed to flow inside the hollow fiber membrane and the dry gas is allowed to flow outside the hollow fiber membrane and vice versa.

  As a means for improving the humidifying performance of the water permeable membrane humidifier 1, it is possible to improve by increasing the size of the hollow fiber membrane module, but it is desirable because it is required to be downsized when used for vehicles. Absent. Therefore, in this embodiment, by devising the shape of a hollow fiber membrane module in which a hollow fiber membrane bundle in which a plurality of water-permeable hollow fiber membranes are potted at both ends is housed in a storage case, humidification performance is achieved. To improve.

  As shown in FIGS. 1 to 4, the humidifier 1 includes a hollow fiber membrane module 6 including a hollow fiber membrane bundle 4 and a housing case 5 for housing the hollow fiber membrane bundle 4 therein. Through a first housing 9 having a gas introduction pipe 8 for introducing exhaust gas into a gas introduction hole 7A formed on the side surface 5a (case side surface 5a), and a gas discharge hole 7B formed similarly on the case side surface 5a. It comprises a second housing 11 having a gas discharge pipe 10 for discharging exhaust gas to the outside of the case.

  The hollow fiber membrane bundle 4 is composed of a hollow fiber membrane 13 having an elongated straw shape with a circular cross section formed inside a first flow path 12 serving as a flow passage penetrating in the longitudinal direction. A plurality of pieces are bundled into a cylindrical shape. A dry oxidant gas pressurized and heated by the compressor 3 is introduced into the first flow path 12 formed inside the hollow fiber membrane 13.

  The housing case 5 is formed as a cylindrical body having both ends that accommodate the hollow fiber membrane bundle 4 having a substantially cylindrical shape inside. The hollow fiber membrane bundle 4 and the housing case 5 are fixed by applying a potting agent (adhesive) 14 to both ends in the longitudinal direction. The potting agent 14 not only joins the hollow fiber membrane 13 and the housing case 5 but also joins the bundled hollow fiber membranes 13 to form the potting portion 15.

  The accommodation case 5 is formed with a gas introduction hole 7A for supplying the exhaust gas introduced from the gas introduction pipe 8 to the inside of the hollow fiber membrane bundle 4 therein. For example, the gas introduction hole 7A is formed as a circular hole similarly to the gas introduction pipe 8, and a plurality of the gas introduction holes 7A are formed at predetermined intervals on the case side surface 5a. Similarly, the gas discharge hole 7B is also formed as a circular hole like the gas discharge pipe 10, and a plurality of predetermined intervals are formed on the case side surface 5a. The gas introduction hole 7A and the gas discharge hole 7B are all formed in the entire circumferential direction of the housing case 5.

  The case side surface 5 a is provided with an annular seal member 16 that seals between the first housing 9 and the second housing 11 and the housing case 5. The seal member 16 is provided at a position outside the gas introduction hole 7A and the gas discharge hole 7B and between the gas introduction hole 7A and the gas discharge hole 7B, and is provided so as to be in close contact with an inner wall of the housing 9 described later. It has been.

  Further, in the present embodiment, a solid fiber bundle 17 made of moisture-absorbing heat-generating fibers having the above-described characteristics is provided at the substantially central portion in the longitudinal direction and the substantially central portion in the radial direction of the hollow fiber membrane bundle 4. 4 is held. Therefore, the hollow fiber membrane 13 of the said part spreads outside, and closely_contact | adheres to the case inner wall 5b without a gap. The portion where the hollow fiber membrane 13 and the case inner wall 5b are in close contact with each other without any gap is that the exhaust gas introduced into the housing case 5 from the gas introduction pipe 8 is discharged from the gap between the housing case 5 and the hollow fiber membrane bundle 4. Therefore, the exhaust gas can enter the hollow fiber membrane bundle 4 (center portion).

  For example, wool or silica gel is used for the solid fiber bundle 17 made of moisture-absorbing heat-generating fibers. In order to increase the heat of adsorption, these wool and silica gel bind a hydrophilic compound to the fiber at the nano level, change the molecular structure itself, and enhance moisture absorption and heat generation effects.

  Further, a gap S <b> 1 is provided between the hollow fiber membrane bundle 4 near the gas introduction hole 7 </ b> A and the case inner wall 5 b to allow the exhaust gas to flow into the hollow fiber membrane bundle 4 (center portion). Similarly, a gap S2 is provided between the hollow fiber membrane bundle 4 near the gas discharge hole 7B and the case inner wall 5b for discharging the exhaust gas flowing through the hollow fiber membrane bundle 4 to the gas discharge pipe 10. ing.

  In the hollow fiber membrane module 6 including the hollow fiber membrane bundle 4 and the housing case 5, the gas discharge hole 7 </ b> B passes through the outside of the hollow fiber membrane 13 housed in the housing case 5 from the gas introduction hole 7 </ b> A. A second flow path is formed as a gas flow path that circulates outside the case.

  The first housing 9 is formed as a cylindrical body that is disposed around the outer periphery of the housing case 5 so as to cover the rear portion of the flow of the oxidizing gas from the central portion of the housing case 5. The first housing 9 has a cylindrical gas introduction pipe for introducing exhaust gas (humid air) containing moisture discharged from the fuel cell 2 into the gas introduction hole 7 </ b> A formed in the housing case 5. 8 is provided.

  The second housing 11 is formed as a cylindrical body disposed around the outer periphery of the housing case 5 so as to cover the central portion of the housing case 5 from the front portion of the flow of the oxidizing gas. The second housing 11 is provided with a gas discharge pipe 10 for discharging the exhaust gas flowing through the hollow fiber membrane bundle 4 to the outside of the case.

  In the humidifier 1 configured as described above, the dried oxidant gas pressurized and heated by the compressor 2 passes through the first flow paths 12 formed in the hollow fiber membranes 13 of the hollow fiber membrane module 6 respectively. Flowing. On the other hand, exhaust gas (swelled air) containing moisture discharged from the cathode of the fuel cell 2 is introduced into a gas introduction pipe 8 provided in the first housing 9. The exhaust gas introduced into the gas introduction pipe 8 is supplied to the hollow fiber membrane bundle 4 from each gas introduction hole 7A formed in the case side surface 5a.

  The exhaust gas supplied to the hollow fiber membrane bundle 4 flows from the outside of the hollow fiber membrane bundle 4 to the inside thereof, and is then discharged from each gas discharge hole 7B formed in the case side surface 5a. The gas is discharged from the gas discharge pipe 10 provided in the second housing 11 to the outside of the case. When the exhaust gas containing moisture flows inside the hollow fiber membrane bundle 4, moisture is condensed (capillary condensation) in the capillaries (first flow paths 12) formed in the hollow fiber membranes 13, and then dried. The moisture permeates from the outside to the inside of the hollow fiber membrane 13 due to the water vapor partial pressure difference from the oxidant gas. The permeated moisture comes into contact with and vaporizes the dried oxidant gas, so that the oxidant gas flowing inside each hollow fiber membrane 13 is humidified. The humidified oxidant gas is supplied to the fuel cell 2 from the discharge side of the hollow fiber membrane module 6.

  In the first embodiment described above, a dry oxidant gas is allowed to flow inside the hollow fiber membrane 13 (first flow path 12), and an exhaust gas containing moisture is allowed to flow outside the hollow fiber membrane 13, Conversely, exhaust gas containing moisture discharged from the fuel cell 2 may be allowed to flow inside the hollow fiber membrane 13, and dried oxidant gas may be allowed to flow outside the hollow fiber membrane 13.

  According to the humidifying device of the present embodiment, the hollow fiber membrane bundle 4 holds the solid fiber bundle 17 made of moisture-absorbing heat-generating fibers at a substantially central portion in the longitudinal direction and a substantially central portion in the radial direction of the hollow fiber membrane bundle 4. As a result, the hollow fiber membrane 13 at that portion is closely attached to the case inner wall 5b without any gap, so that it is possible to prevent the exhaust gas containing moisture from flowing directly from the gas introduction hole 7A to the gas discharge hole 7B. The humidification efficiency can be improved by passing the gas to the center of the membrane bundle 4.

  On the other hand, in the humidifier having the conventional structure shown in FIG. 8, a gap S3 is generated between the outside of the hollow fiber membrane bundle 4 and the case inner wall 5b of the housing case 5. Since the resistance of the hollow fiber membrane bundle 4 is large, it is difficult for the gas to flow to the vicinity of the center of the hollow fiber membrane bundle 4, and the gas is directly generated from the gap S3 generated between the outside of the hollow fiber membrane bundle 4 and the case inner wall 5b of the housing case 5. There is a problem that the oxidant gas that flows to the discharge hole 7B and is not sufficiently humidified.

  Further, according to the humidifier of the present embodiment, the solid fiber bundle 17 made of moisture-absorbing heat-generating fibers generates heat when it absorbs moisture, so that the heat raises the gas temperature of the oxidant gas supplied to the fuel cell 2. And humidification efficiency can be increased. Furthermore, moisture that cannot permeate is absorbed by the solid fiber bundle 17 made of moisture-absorbing heat-generating fibers and generates heat, so that the oxidant gas temperature rises as a whole, preventing excessive generation of condensed water, and the flow of gas Since it becomes uniform without being inhibited, the water vapor permeability to the hollow fiber membrane can be improved.

  In addition, the fuel cell 2 has a small amount of power generated by the fuel cell stack immediately after starting at low temperature or after standing for a long time, so that humid air does not come to the exhaust gas side. In order to recover the moisture contained in the solid fiber bundle 17 made of the material, the dried oxidant gas can be humidified. Therefore, it is possible to start the fuel cell system even when starting at a low temperature.

“Second Embodiment”
FIG. 5 is a longitudinal sectional view of the humidifying device of the second embodiment.

  In the first embodiment, the solid fiber bundle 17 made of moisture-absorbing heat-generating fibers is held by the hollow fiber membrane bundle 4 at a substantially central portion in the longitudinal direction of the hollow fiber membrane bundle 4 and a substantially central portion in the radial direction. In the second embodiment, the solid fiber bundle 17 made of moisture-absorbing heat-generating fibers is formed at the substantially central portion in the radial direction of the hollow fiber membrane bundle 4 from the one end (oxidant gas introduction side) of the hollow fiber membrane bundle 4 to the other end ( The hollow fiber membrane 13 is held in close contact with the inner wall 5b of the case without any gap by being held in the entire lengthwise direction by the hollow fiber membrane bundle 4 over the oxidizing gas discharge side).

  According to the humidifying device of this embodiment, the solid fiber bundle 17 made of moisture-absorbing heat-generating fibers is hollow at the substantially central portion in the radial direction of the hollow fiber membrane bundle 4 and from one end to the other end of the hollow fiber membrane bundle 4. Since it is held in the entire longitudinal direction by the yarn membrane bundle 4, the hollow fiber membrane 13 spreads outside in a wide range in the longitudinal direction, and the hollow fiber membrane bundle 4 and the case inner wall 5b are in close contact with each other without any gaps. The humidification efficiency can be improved by passing the gas to the center of the bundle 4.

  In addition, since the other effect by the humidification apparatus of this embodiment is the same as the humidification apparatus of 1st Embodiment, the description is abbreviate | omitted.

“Third Embodiment”
FIG. 6 is a longitudinal sectional view of the humidifying device of the third embodiment.

  In the third embodiment, a solid fiber bundle 17 made of moisture-absorbing heat-generating fibers is provided between the hollow fiber membrane bundle 4 and the housing case 5, and the solid fiber bundle 17 made of moisture-absorbing heat-generating fibers is formed in the case inner wall 5b with a gap. It is closely attached. Specifically, a solid fiber bundle 17 made of moisture-absorbing exothermic fibers is provided at a substantially central portion in the longitudinal direction of the hollow fiber membrane bundle 4 so as to be wound around the entire periphery of the hollow fiber membrane bundle 4, and the hygroscopic exothermic fibers are provided. The solid fiber bundle 17 made of is closely attached to the case inner wall 5b of the housing case 5 without a gap.

  According to the humidifier of this embodiment, since the solid fiber bundle 17 made of moisture-absorbing heat-generating fibers wound around the hollow fiber membrane bundle 4 is in direct contact with the case inner wall 5b, the exhaust gas containing moisture is discharged. Further, it is possible to prevent the gas from flowing directly into the gas discharge hole 7B without passing through the hollow fiber membrane bundle, and the humidification efficiency can be improved by passing the gas to the center of the hollow fiber membrane bundle 4.

  In addition, since the other effect by the humidification apparatus of this embodiment is the same as the humidification apparatus of 1st Embodiment, the description is abbreviate | omitted.

“Fourth Embodiment”
FIG. 7 is a longitudinal sectional view of the humidifying device of the fourth embodiment.

  In the present embodiment, a solid fiber bundle 17 made of moisture-absorbing heat-generating fibers is provided between the case inner wall 5b and the hollow fiber membrane bundle 4 at the bottom of the housing case 5, and the solid fiber bundle made of the moisture-absorbing heat-generating fibers. 17 is closely attached to the case inner wall 5b without a gap. Specifically, the hollow fiber membrane bundle 4 is in close contact with the hollow fiber membrane bundle 4 and the case inner wall 5b at the substantially central portion in the longitudinal direction of the hollow fiber membrane bundle 4 and on the bottom of the housing case 5 on the side where the gas discharge pipe 10 is provided. Thus, a solid fiber bundle 17 made of moisture-absorbing exothermic fibers is provided without any gap.

  According to the humidifying device of the present embodiment, by providing the solid fiber bundle 17 made of moisture-absorbing heat-generating fibers at the bottom of the housing case 5, the exhaust gas containing moisture on the bottom side of the housing case 5 becomes hollow fiber membranes. It can be prevented from flowing directly into the gas discharge hole 7B without passing through the bundle, and the hollow fiber membrane bundle 4 spreads outward by being pushed by the solid fiber bundle 17 made of this hygroscopic heat-generating fiber, and there is no gap with the case inner wall 5b. By adhering, the exhaust gas containing moisture can be prevented from flowing directly into the gas exhaust hole 7B without passing through the hollow fiber membrane bundle in the entire housing case.

  Further, according to the humidifier of the present embodiment, water vapor that cannot be completely permeated or water vapor that condenses after the fuel cell system is stopped accumulates at the bottom of the housing case 5, but the water accumulated at the bottom is solid made of moisture-absorbing heating fibers. The fiber bundle 17 can absorb. If the constricted water remains in the bottom of the housing case 5, it may freeze at low temperatures and the humidification efficiency may decrease. However, the solid fiber bundle 17 made of moisture-absorbing heat-generating fibers absorbs the condensed water accumulated in the bottom. Therefore, such a problem can be avoided.

It is a block diagram which shows an example of the humidification apparatus of the fuel cell in 1st Embodiment. It is the longitudinal cross-sectional view of the humidification apparatus which fractured | ruptured the housing part of FIG. 1 and showed the internal storage case. FIG. 3A is an enlarged perspective view of the main part showing the end shape of the hollow fiber membrane bundle housed in the housing case, and FIG. 3B is an enlarged perspective view of the main part of the hollow fiber membrane. It is a longitudinal cross-sectional view of the humidification apparatus shown by fracture | ruptured to the part by which a hollow fiber membrane bundle is arrange | positioned. It is a longitudinal cross-sectional view of the humidification apparatus of 2nd Embodiment. It is a longitudinal cross-sectional view of the humidification apparatus of 3rd Embodiment. It is a longitudinal cross-sectional view of the humidification apparatus of 4th Embodiment. It is a longitudinal cross-sectional view of the humidification apparatus of a conventional structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Humidifier 2 ... Fuel cell 3 ... Compressor 4 ... Hollow fiber membrane bundle 5 ... Housing case 5a ... Case side surface 5b ... Case inner wall 6 ... Hollow fiber membrane module 7A ... Gas introduction hole 7B ... Gas discharge hole 8 ... Gas introduction pipe 9 ... 1st housing 10 ... Gas exhaust pipe 11 ... 2nd housing 12 ... 1st flow path (flow path inside a hollow fiber membrane)
13 ... Hollow fiber membrane 14 ... Potting agent 15 ... Potting part 17 ... Solid fiber bundle comprising hygroscopic heat-generating fibers

Claims (5)

A hollow fiber membrane module containing a hollow fiber membrane bundle formed by bundling a plurality of hollow fiber membranes in a cylindrical case,
In the first flow path passing through the inside of the hollow fiber membrane, either a dry oxidant gas or an exhaust gas containing moisture discharged from the fuel cell is circulated,
From the gas introduction hole formed on the side surface of the hollow fiber membrane module, passes outside the membrane of the hollow fiber membrane, and flows from the gas discharge hole formed on the side surface of the hollow fiber membrane module to the outside of the hollow fiber membrane module. In the second flow path, the other one of the oxidant gas and the exhaust gas is circulated,
A fuel cell humidifier for humidifying the oxidant gas with the exhaust gas,
A fuel comprising: a solid fiber bundle made of hygroscopic heat-generating fibers provided in the hollow fiber membrane module; and either the solid fiber bundle or the hollow fiber membrane bundle being in close contact with the inner wall of the case Battery humidifier. A fuel cell humidifier according to claim 1,
A humidifying device for a fuel cell, characterized in that a solid fiber bundle made of the moisture-absorbing heat-generating fibers is provided inside the hollow fiber membrane module and at a substantially central portion in the longitudinal direction of the hollow fiber membrane module. A fuel cell humidifier according to claim 1,
A humidifier for a fuel cell, characterized in that a solid fiber bundle composed of the moisture-absorbing heat-generating fibers is provided from one end to the other end in the longitudinal direction of the hollow fiber membrane module inside the hollow fiber membrane module. . A fuel cell humidifier according to claim 1,
A humidifying device for a fuel cell, wherein a solid fiber bundle made of the moisture-absorbing heat-generating fibers is provided between the hollow fiber membrane bundle and the case. A humidifying device for a fuel cell according to claim 4,
A humidifier for a fuel cell, characterized in that a solid fiber bundle made of the moisture-absorbing heat-generating fibers is provided at the bottom of the hollow fiber membrane module.

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