JP2020068152A - Fuel cell device - Google Patents

Abstract

To provide a fuel cell device capable of efficiently draining water remaining in a radiator and capable of inhibiting destruction from being caused by freezing of water.SOLUTION: A fuel cell device 10 comprises: a fuel cell module 1 for generating power; a heat exchanger 2 for performing heat exchange between high temperature exhaust gas discharged from the fuel cell module and liquid as a heat medium; a storage tank 3 for storing the liquid; a circulation pipeline L1 for making the liquid circulate between the storage tank and the heat exchanger; and a radiator 4 disposed between the storage tank and the heat exchanger to cool the liquid. The fuel cell device also comprises a gas introduction part, such as a pump P2, connected to the circulation pipeline L1 located between the radiator 4 and the heat exchanger 2 or the circulation pipeline L1 located between the storage tank 3 and the radiator 4 to send, to the radiator 4, air for draining water remaining inside the radiator.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a fuel cell device.

  A fuel cell device heats a fuel cell module that burns excess fuel gas (offgas) after power generation, a high-temperature combustion exhaust gas discharged from the fuel cell module, and a liquid that serves as a heat medium to exchange heat. And an exchanger. Further, it is provided with a storage tank for storing the liquid (heat medium) whose temperature has risen, and a circulation pipe which is a flow path for circulating the liquid as the heat medium between the storage tank and the heat exchanger.

  Further, the fuel cell device heat-exchanges the liquid circulating between the storage tank and the heat exchanger on the above-mentioned circulation pipe with a radiator that cools the liquid before it flows into the heat exchanger, and the liquid cooled by the radiator. And a circulation means such as a circulation pump for feeding the container (see Patent Documents 1 and 2).

JP, 2010-205631, A Japanese Patent No. 6223616

  By the way, in the fuel cell device, water intervenes in many processes and stores a large amount of water used in these processes. Therefore, when the operation or operation of the fuel cell device is stopped for a long period of time, it is preferable to drain water efficiently in order to prevent damage caused by freezing of water stored in the housing. In particular, it is preferable to drain water remaining in the radiator efficiently.

The fuel cell device of the present disclosure is
A fuel cell that generates electricity using an oxygen-containing gas and a fuel gas;
A heat exchanger for exchanging heat between the exhaust gas discharged from the fuel cell and the liquid;
A storage tank for storing the liquid,
Circulation piping for circulating the liquid between the storage tank and the heat exchanger,
A radiator arranged between the storage tank and the heat exchanger, for cooling the liquid,
The circulation pipe located between the radiator and the heat exchanger, or the circulation pipe located between the storage tank and the radiator, a gas introduction unit for supplying gas to the radiator And are provided.

  INDUSTRIAL APPLICABILITY The fuel cell device according to the present disclosure can efficiently drain water remaining in the radiator and can prevent damage due to freezing of water.

It is a schematic block diagram of the fuel cell apparatus of 1st Embodiment. It is a schematic block diagram of the fuel cell apparatus of 2nd Embodiment. It is a schematic block diagram of the fuel cell apparatus of 3rd Embodiment. It is a schematic block diagram of the fuel cell apparatus of 4th Embodiment. It is a schematic block diagram of the fuel cell apparatus of 5th Embodiment. It is a schematic block diagram of the fuel cell apparatus of 6th Embodiment. It is a schematic block diagram of the water drainage structure in the fuel cell apparatus of 7th Embodiment. It is an appearance perspective view of a case showing arrangement of a drain plug in a fuel cell device of a 7th embodiment.

Hereinafter, the fuel cell device of the embodiment will be described with reference to the drawings.
1 to 6 are schematic configuration diagrams showing a circulation pipe (L1) and its drainage structure in the fuel cell device of the embodiment. 1 to 6 correspond to a state in which the fuel cell is stopped, respectively. The flow direction of water (drainage) in the pipe shown by the arrow in the figure and the white arrow The air flowing directions shown in the figures both indicate the moving directions when the water in the pipe is drained (hereinafter, water is drained).

  In the fuel cell devices 10, 11, 20, 21, 30, 40 of each embodiment, the configuration around the circulation pipe L1 as a flow path of the heat medium is common, and the fuel cell module 1 and the fuel cell module 1 are discharged. The heat exchanger 2 for exchanging heat between the generated high-temperature exhaust gas and the liquid (water in this case) as the heat medium, the storage tank 3 for storing the heat medium (water) whose temperature has risen, and the heat A circulation pipe L1 for circulating a medium (water) between the storage tank 3 and the heat exchanger 2.

  Further, as an auxiliary device common to each of the fuel cell devices 10, 11, 20, 21, 30, 40, a radiator 4 for cooling the circulating water on the circulation pipe L1 before flowing into the heat exchanger 2, and a radiator 4. A circulation pump P1 for feeding the water cooled in step 1 to the heat exchanger 2 is provided.

  Each of the fuel cell devices 10, 11, 20, 21, 30, 40 is an air blower B for supplying an oxygen-containing gas (air) to the fuel cell module 1 and a flow of the air, which are used during the power generation operation. A pipe that is a passage and a pipe that is a fuel gas passage for supplying the fuel gas to the fuel cell module 1 are provided, but when these are not used for draining water, a virtual line ( It is indicated by a chain double-dashed line) and no particular explanation is given.

  Further, the fuel cell module 1 and each of the auxiliary devices such as the storage tank 3 and the radiator 4 which assist the operation of the fuel cell module 1 are, as shown in FIG. One side surface composed of a region 51a and a lower region 51b]. The storage tank 3 may be independently provided outside the exterior case 50 that houses the fuel cell module 1.

The characteristic configuration of each embodiment will be described below.
In the fuel cell device 10 of the first embodiment shown in FIG. 1, one end of the gas introduction pipe S is provided in the circulation pipe L1 between the radiator 4 and the heat exchanger 2 as an air flow path for supplying air into the radiator 4. Are connected so as to branch from the circulation pipe L1. In addition, as a first drainage pipe for discharging the water in the storage tank 3 and the radiator 4, one end of the drainage pipe D, which is a drainage flow path, branches into a circulation pipe L1 between the storage tank 3 and the radiator 4. Connected to each other.

  A valve is provided at an end portion of the gas introduction pipe S on the outside of the outer case 50 on the right side in the drawing, that is, an open end portion of the gas introduction pipe S located on the opposite side of the connection end portion with the circulation pipe L1. A water stop plug V1 is provided. Similarly, at the open end of the drainage pipe D on the right side in the drawing, which is outside the exterior case 50, a water stop valve V2 having a similar valve is arranged.

  By the way, as described above, the fuel cell device may drain the water (heat medium) in the storage tank 3 and the circulation pipe L1 to prepare for freezing when the operation is stopped for a long time. Good. Here, in the radiator 4 provided in the middle of the circulation pipe L1, since the internal pipe is a meandering flow path, it is difficult for water to escape, and when the water remaining in the radiator 4 freezes, the internal pipe is damaged. Or it may lead to rupture. Therefore, it is preferable that the water remaining in the radiator 4 can be drained efficiently.

  In the above-described configuration, when water is drained from the circulation pipe L1, first, the water stop valve V2 located below or below the storage tank 3 and the radiator 4 is opened to remove water in the storage tank 3, The water in the circulation pipe L1 that flows out by natural flow (fall) is drained.

  Next, for example, a pump P2 as shown in the drawing is prepared, and this pump P2 is connected to the open end of the gas introduction pipe S. The pump P2 is operated to feed or send air from the water stop valve V1 arranged at the open end of the gas introduction pipe S into the circulation pipe L1 as indicated by the white arrow. Thereby, the water remaining in the meandering pipe in the radiator 4 can be pushed out toward the water stop valve V2.

  As a result, the fuel cell device 10 can efficiently drain the water in the circulation pipe L1 remaining in the radiator 4 and the like. Therefore, the fuel cell device 10 can suppress damage due to freezing of the water remaining in the circulation pipe L1, especially in the radiator 4.

  Note that in the case of the configuration of the fuel cell device 10 shown in FIG. Thus, the fluid flows toward the circulation pipe L1 on the radiator 4 side.

  Further, as the gas introduction portion such as a pump connected to the water stop valve V1 of the gas introduction pipe S, for example, an air pump or an air blower of a manual type or a drive type, or an air pressure feeding device such as a compressor may be used. it can. Further, a pump or the like that can supply other gas such as nitrogen, which is less likely to adversely affect the fuel cell device, may be used.

  Next, the fuel cell device 11 of the second embodiment shown in FIG. 2 is a modification of the first embodiment in which the above-mentioned pump P2 is connected to the water stop valve V2.

  In the second embodiment, the pump P2 is driven to send in air, and the water in the circulation pipe L1 remaining in the radiator 4 or the like is drained to the outside from the water stop valve V1. That is, in the fuel cell device 11 of the second embodiment shown in FIG. 2, one end of the first drainage pipe D1 is connected to the circulation pipe L1 between the radiator 4 and the heat exchanger 2. Further, one end of a second drainage pipe D2 that also serves as a gas introduction pipe (S) is connected to the circulation pipe L1 between the storage tank 3 and the radiator 4.

  The above-mentioned second drainage pipe D2 functions as the drainage pipe D in the first embodiment when draining the water in the storage tank 3, and inside the radiator 4 when draining the water in the radiator 4. It functions as a gas introduction pipe S that is an air flow path for supplying air to the.

  In addition, in FIG. 2, a check valve V3 (also referred to as a check valve) is provided between the lower portion of the storage tank 3 on the left side of the drawing and the connecting portion between the circulation pipe L1 and the second drain pipe D2 (S). ) Is provided. Thereby, the air (white arrow) fed from the second drainage pipe D2 (S) flows through the circulation pipe L1 toward the radiator 4 side as shown in the figure. The check valve V3 may be omitted.

  Also with the above configuration, the water sent in the meandering pipe in the radiator 4 can be pushed out toward the water stopcock V1 by the air sent by the pump P2.

  Therefore, also in the fuel cell device 11 of the second embodiment, as in the first embodiment, the water in the circulation pipe L1 that remains in the radiator 4 or the like can be efficiently drained, and the water in the circulation pipe L1, especially in the radiator 4, can be discharged. It is possible to suppress damage caused by freezing of residual water.

  As in the first embodiment, as the pump P2, for example, a manual type, a driving type pump, an air blower, or the like, and an air pressure feeding device such as a compressor can be used. Further, a pump or the like that can supply other gas such as nitrogen, which is less likely to adversely affect the fuel cell device, may be used.

  Next, in the third and fourth embodiments shown in FIGS. 3 and 4, the existing air blower B (shown by a solid line in FIGS. 3 and 4) described above is used to supply air to the radiator. It is used.

  In the fuel cell device 20 of the third embodiment shown in FIG. 3, the gas introduction pipe S connects the air blower B and the circulation pipe L1 located between the radiator 4 and the heat exchanger 2. Specifically, as an air flow path for supplying air into the radiator 4, an air pipe for supplying air from the air blower B to the fuel cell module 1 and a circulation pipe located between the radiator 4 and the heat exchanger 2. A gas introducing pipe S is provided between L1 and L1 to connect them.

  Further, as a first drainage pipe for discharging the water in the storage tank 3 and the radiator 4, one end of the drainage pipe D is branched and connected to the circulation pipe L1 between the storage tank 3 and the radiator 4.

  In FIG. 3, the three-way valve V4 disposed on the connection point between the air pipe and the gas introduction pipe S is the air blower B for the air destination, the fuel cell module 1 side, or the circulation pipe L1 side, or the fuel. This is for switching to both the battery module 1 side and the circulation pipe L1 side. Not limited to the configuration of FIG. 3 described above, a valve may be provided in the gas introduction pipe S and a part of the air flowing through the air pipe may flow into the gas introduction pipe S. In this case, the valve V4 is not limited to a three-way valve, but an electromagnetic valve or the like can be used.

  On the side of the gas introduction pipe S that is connected to the circulation pipe L1 (in the vicinity of the circulation pipe L1 on the left side in the drawing), backflow of water, which is a heat medium flowing in the circulation pipe L1, into the gas introduction pipe S is prevented. A check valve V5 is provided for this purpose. The check valve V5 may be omitted.

  According to the above-mentioned configuration, the three-way valve V4 is opened to the gas introduction pipe S side and the air blower B is actuated, so that the air outside the device is circulated through the circulation pipe L1 as shown by the white arrow in FIG. It can be fed into the radiator 4 via. Then, similarly to the first embodiment, the water remaining in the meandering pipe in the radiator 4 is pushed out toward the water stop valve V2 and drained.

  As described above, also with the configuration of the fuel cell device 20, the water in the circulation pipe L1 remaining in the radiator 4 or the like can be reliably drained. Therefore, also in the fuel cell device 20 of the third embodiment, as in the second embodiment, the water in the circulation pipe L1 remaining in the radiator 4 or the like can be efficiently drained, and the water in the circulation pipe L1, especially the radiator 4 can be discharged. It is possible to suppress damage caused by freezing of residual water.

  Next, in the fuel cell device 21 of the fourth embodiment shown in FIG. 4, the gas introduction pipe S connects the air blower B and the circulation pipe L1 located between the storage tank 3 and the radiator 4, This corresponds to a modification of the third embodiment. Similarly to the second embodiment, the air sent from the air blower B is introduced into the circulation pipe L1 between the storage tank 3 and the radiator 4, and the water in the circulation pipe L1 remaining in the radiator 4 or the like is stopped. Drain from the faucet V1 to the outside.

  That is, in the fuel cell device 21 of the fourth embodiment shown in FIG. 4, an air pipe for supplying air from the air blower B to the fuel cell module 1 as an air flow path for supplying air into the radiator 4, and a storage tank. 3 and the circulation pipe L1 located between the heat exchanger 2 and one end of a gas introduction pipe S connecting them are branched and connected via a three-way valve V4. A check valve V3 is arranged on the side of the storage tank 3 of the branch connection.

  One end of a first drainage pipe D1 for discharging water in the radiator 4 is branched and connected to the circulation pipe L1 between the radiator 4 and the heat exchanger 2 in the fuel cell device 21. Further, a second drainage pipe D2 mainly responsible for draining water in the storage tank 3 is also connected to the circulation pipe L1 between the storage tank 3 and the radiator 4, which is the same as the connection position of the gas introduction pipe S described above. ing.

  It should be noted that, in consideration of the efficient use of the air supplied from the air blower B, the arrangement position of the above-mentioned check valve V3 is such that the connection position of the gas introduction pipe S and the second drainage as shown in FIG. The position on the circulation pipe L1 between the connection position of the pipe D2 and the position where the check valve V3 is provided is not limited to this position. For example, it may be arranged on the circulation pipe L1 between the connection position of the second drainage pipe D2 and the storage tank 3.

  With the above configuration as well, the three-way valve V4 is opened to the gas introduction pipe S side, the air blower B is operated, and air is fed into the circulation pipe L1 from the branch connection portion between the gas introduction pipe S and the circulation pipe L1. Thereby, the water remaining in the meandering pipe in the radiator 4 can be pushed out toward the water stopcock V1.

  Therefore, also in the fuel cell device 21 of the fourth embodiment, as in the second embodiment, the water in the circulation pipe L1 remaining in the radiator 4 or the like can be efficiently drained, and the water in the circulation pipe L1, particularly the radiator 4 can be discharged. It is possible to suppress damage caused by freezing of residual water.

  Next, in the fuel cell device 30 of the fifth embodiment shown in FIG. 5, instead of using the pump P of the second embodiment and the air blower B of the fourth embodiment, a fuel cell device 30 is newly installed in the housing. The installed pump P3 is used.

  In the fifth embodiment, the fuel cell device 30 drives the pump P3 to send air into the radiator 4 and drain the water in the radiator 4 to the outside from the water stopcock V1. That is, in the fuel cell device 30 shown in FIG. 5, a part of the circulation pipe L1 located between the storage tank 3 and the radiator 4 is bypassed as an air flow path for supplying air into the radiator 4. Both ends of the gas introduction pipe S are arranged. Both ends of the gas introduction pipe S are arranged so as to straddle a connecting portion between a second drainage pipe D2 and a circulation pipe L1 described later. Further, the above-mentioned new pump P3 is arranged in the middle portion of the bypass-shaped gas introduction pipe S.

  In the circulation pipe L1 between the storage tank 3 and the radiator 4, which is the same as the connection position of the gas introduction pipe S, between the one end side connection part and the other end side connection part of the gas introduction pipe S, the above-mentioned second drainage is provided. One end of the pipe D2 is branched and connected. Further, a check valve V3 for preventing backflow of air and water to the storage tank side is arranged between the one end side connecting portion and the other end side connecting portion of the gas introduction pipe S.

  As in the second and fourth embodiments, one end of the first drainage pipe D1 for discharging the water in the radiator 4 is branched and connected to the circulation pipe L1 between the radiator 4 and the heat exchanger 2. A water stop plug V1 is provided on the right side in the drawing, which is the open end of the first drain pipe D1 on the outside of the apparatus.

  Also in the fuel cell device 30, the second drainage pipe D2 of the circulation pipe L1 between the storage tank 3 and the radiator 4 which is branched and connected to the storage tank 3 side from the check valve V3 is mainly in the storage tank 3. It is responsible for draining water.

  As shown in FIG. 5, the above-mentioned check valve V3 is disposed at a connection position between one end of the gas introduction pipe S, which is the downstream end of the air flow, and the circulation pipe L1, and the second drain pipe D2. The check valve V3 is not limited to this position. However, the check valve V3 is not limited to this position. For example, you may arrange | position on the storage tank 3 side rather than the connection part of the 2nd drainage piping D2 and the circulation piping L1.

  Here, the pump P3 can be operated after the water in the storage tank 3 is completely drained. Further, when the pump P3 is operated in a state where the water in the storage tank 3 remains, it can be continuously operated even after the water in the storage tank 3 is drained.

  When the pump P3 is operated while the water in the storage tank 3 remains, the water flowing through the circulation pipe L1 flows to the radiator 4 side. Therefore, water may remain in the radiator 4. On the other hand, if the pump P3 is operating after the water in the storage tank 3 is drained, the air in the storage tank 3 can be supplied to the radiator 4.

  According to the above configuration, the pump P3 on the gas introduction pipe S is operated, and the air is sent into the radiator 4 from the one end side of the bypass-shaped gas introduction pipe S through the circulation pipe L1. The water remaining in the can be pushed out toward the water stopcock V1.

  Therefore, also in the fuel cell device 30 of the fifth embodiment, as in the second and fourth embodiments, the water in the circulation pipe L1 remaining in the radiator 4 or the like can be efficiently drained, and the circulation pipe L1, especially the radiator It is possible to suppress damage caused by freezing of the water remaining in 4.

  Next, in the sixth embodiment shown in FIG. 6, similarly to the third embodiment described above, it is possible to use the existing auxiliary machines and configurations without adding new auxiliary machines and pipes as much as possible, and It is intended to complete the drainage in the radiator 4 at a cost. However, the circulation pump arranged in the circulation pipe L1 is replaced with a pump P1 'of a type capable of reverse rotation (reverse feed).

  According to the above structure, the circulation pump P1 ′ on the circulation pipe L1 is rotated in a direction opposite to that in the normal operation to operate so as to send air to the radiator, so that the water remaining in the radiator 4 is removed. As in the first embodiment, the water is drained to the outside of the system through the drainage pipe D which is the drainage flow path.

  Therefore, also in this method, as in the other embodiments, the water in the circulation pipe L1 remaining in the radiator 4 or the like can be efficiently drained, and the water remaining in the circulation pipe L1, especially in the radiator 4 can be frozen. The accompanying damage can be suppressed.

  Next, with reference to FIGS. 7 and 8, a water stop plug (also referred to as a water drain plug) arranged on the outer surface (side surface) of the outer case 50 will be described.

  In the above-described first to sixth embodiments, the description has been given focusing on the radiator 4 in which it is difficult to remove water from the internal pipe, but as described above, the water used for the process is provided in the fuel cell device. Are stored in many places or tanks, tanks, etc. Therefore, when the operation of the fuel cell is stopped for a long period of time, it is preferable to drain the water stored in these other tanks as well.

  For example, in the case of the fuel cell device 100 of the seventh embodiment shown in FIG. 7, drainage pipes D11 (first, third, and third) connected to the water shutoff valve V2 for discharging water in the storage tank 3 and the radiator 4 are provided. (Corresponding to the drainage pipe D in the sixth embodiment). Further, drainage pipe D12 for discharging water (reserved water) stored in the neutralization tank 7 for neutralizing surplus water of reforming water (acidic) with a neutralizing agent filled inside when the operation is stopped. And a water stop V12 at its tip.

  Further, when the operation of the fuel cell is stopped, the water (retained water) accumulated in the ion exchange resin tank 5 containing the ion exchange resin for purifying the condensed water (condensed water channel C) in which the moisture in the exhaust gas is condensed is discharged. A drainage pipe D13 and a water stopper V13 at the tip thereof are provided. In addition, a drainage pipe D14 for discharging the water (reserved water) stored in the reforming water tank 6 that stores the purified condensed water for supply to the reformer and a water stop valve V14 at the tip thereof. Prepare

  The fuel cell device 100 shown in FIG. 7 utilizes the temperature of the heat medium to add tap water (tap water) for hot water supply to the outside by the second heat exchanger 8 (tap water heat exchanger). A "second heat medium circulation system" (circulation pipe L2) for heating is provided. In this case, the drainage pipe D10 for discharging the water in the circulation pump P4 (also referred to as a residual heat pump) arranged in the second circulation pipe L2 and the water stop plug V10 at its tip are the bases of the circulation pump P4. It is connected to the bottom of the base or rotating part.

  It should be noted that, as described in the first embodiment, a gas introducing pipe S for supplying air into the radiator 4, a water stop valve V1 provided at an open end of the gas introducing pipe S, and circulation from the water stop valve V1. The pump P2 for feeding air into the pipe L1 is depicted by a virtual line (two-dot chain line) in FIGS. 7 and 8 and its description is omitted.

  As described above, in the fuel cell device 100 of the seventh embodiment, the liquid (water) used in the casing (exterior case 50) or the liquid such as tap water supplied into the exterior case 50 is packaged. A drainage pipe D, drainage pipes D10 to D14, and the like are provided as a plurality of drainage flow paths that flow through to the outside of the case 50.

  In addition, the fuel cell device 100 is a drain plug that is a drain member attached to each end portion (open end portion) outside the outer case 50 of the drainage pipes D10 to D14 that are the plurality of drainage flow paths. V2, V10, V12 to V14 and the like are provided. It should be noted that each stop cock has a valve (valve) as described above.

  The drainage members V2, V10, V12, V13, and V14 of the fuel cell device 100 are the first predetermined side surfaces of the outer case 50, which are the user's or worker's. It is arranged so as to project outward from the easily accessible maintenance surface 51, that is, the removable maintenance panel.

  The plurality of water stop plugs V2, V10, V12, V13, V14, when viewed in an external view as shown in FIG. 8, have a center in the vertical height direction on the maintenance surface 51 (first side surface) described above. They are arranged side by side in a lower region (lower region indicated by reference numeral 51a in the figure).

  In addition, in the seventh embodiment, when including the surrounding structure, the fuel cell device 100 is installed such that the fuel cell device is raised from the floor (or the ground) as shown in FIG. It is placed on the base 60. Then, each of the water stop plugs V2, V10, V12, V13, and V14 projecting from the maintenance surface 51 is arranged so as to project more outward than the end portion of the installation base 60 described above.

  According to the above configuration, there is no plan to use the fuel cell device for a long period of time, and water can be easily drained even when the user, the operator, etc. have to drain the water in the fuel cell device. be able to.

  That is, since the stopcocks V2, V10, V12, V13, and V14, which are the work targets, are arranged on the easily accessible maintenance surface 51 so that they can be seen at a glance, they are users without prior knowledge. Also, you can easily find the "water drain plug" by following the instructions in the instruction manual or the manual. It should be noted that a cover or cover panel may be attached to cover each of the water stoppers V2, V10, V12, V13, and V14 individually or collectively.

  Further, each of the water stop plugs V2, V10, V12, V13, V14 is arranged so as to project outside the exterior case 50 and outside the installation base 60 on which the fuel cell device 100 is mounted. ing. Therefore, if a liquid storage container such as a bucket or a vat is arranged at the lower edge of the installation base 60, the water discharged from each of the water stopcocks V2, V10, V12, V13, and V14 can be collected collectively. It is convenient and convenient. Further, as usual, a hose or the like may be connected to the tip of each of the water stopcocks V2, V10, V12, V13, and V14 so that the drainage flows down to the rainwater basin or the like.

1 Fuel Cell Module 2 Heat Exchanger 3 Storage Tank 4 Radiator S Gas Inlet Pipe P2 Pump L1 Circulation Pipe

Claims (16)

A fuel cell that generates electricity using an oxygen-containing gas and a fuel gas;
A heat exchanger for exchanging heat between the exhaust gas discharged from the fuel cell and the liquid;
A storage tank for storing the liquid,
Circulation piping for circulating the liquid between the storage tank and the heat exchanger,
A radiator arranged between the storage tank and the heat exchanger, for cooling the liquid,
The circulation pipe located between the radiator and the heat exchanger, or the circulation pipe located between the storage tank and the radiator, a gas introduction unit for supplying gas to the radiator When,
A fuel cell device comprising: The gas introducing unit includes a gas introducing pipe,
The fuel cell device according to claim 1, wherein one end of the gas introduction pipe is branched and connected to the circulation pipe.   The fuel cell device according to claim 1, wherein the gas introduction unit is a pump connected to or disposed in the circulation pipe. The heat exchanger is located above the radiator,
The fuel cell device according to claim 1, wherein the gas introduction unit is connected to the circulation pipe located between the radiator and the heat exchanger. An oxygen-containing gas supply unit for supplying the oxygen-containing gas to the fuel cell,
The fuel cell device according to claim 2 or claim 4, wherein the other end of the gas introduction pipe is connected to the oxygen-containing gas supply part. A first drain pipe for discharging the liquid in the radiator,
The circulation pipe located between the radiator and the heat exchanger, or the circulation pipe located between the storage tank and the radiator, the side of the gas introduction portion is not connected The fuel cell device according to claim 1, wherein the first drainage pipe is branched and connected to the circulation pipe. Equipped with a second drainage pipe,
The circulation pipe located between the storage tank and the radiator, the gas introduction unit is connected,
The fuel cell device according to any one of claims 1 to 3, wherein the second drainage pipe is branched and connected to the circulation pipe located between the storage tank and the radiator.   The gas introduction unit is connected to the same position as the second drainage pipe or a position closer to the radiator than the second drainage pipe is, of the circulation pipes located between the storage tank and the radiator. 7. The fuel cell device according to 7.   The fuel cell device according to claim 7, wherein the gas introducing unit also serves as the second drainage pipe.   The fuel cell device according to claim 8 or 9, wherein a check valve is provided on an upstream side or a downstream side in a liquid flow direction of a connection portion of the circulation pipe with the second drainage pipe. An outer case that houses the fuel cell, the radiator, and the storage tank,
A drainage pipe connected to the circulation pipe and allowing liquid to flow to the outside of the outer case,
A first drainage member attached to a first end of the drainage pipe outside the outer case;
Equipped with
The fuel cell device according to claim 1, wherein the first drainage member is disposed so as to project outward from the first side surface of the exterior case. A plurality of drainage passages for flowing the liquid used in the outer case or the liquid supplied into the outer case to the outside of the outer case when the power generation operation is stopped,
A plurality of drainage members attached to each end of the plurality of drainage flow paths outside the outer case,
The fuel cell device according to claim 1, wherein each of the drainage members is disposed on a predetermined first side surface of the side surfaces of the exterior case so as to project outward from the first side surface.   13. The fuel cell device according to claim 12, wherein each of the drainage members is arranged on a region of the first side face that is below a center in a vertical height direction.   The fuel cell device according to claim 11, wherein the first side surface is a removable maintenance panel.   The fuel cell device according to any one of claims 11 to 14, wherein the drainage member includes a valve. An installation base for arranging the fuel cell device raised from the floor is provided below the fuel cell device, and the installation base is placed on the installation base. In the fuel cell device of
The fuel cell device, wherein the drainage member is disposed so as to project outward from the installation base.