JP5239994B2 - Fuel cell device - Google Patents

Description

  The present invention relates to a fuel cell device that generates power by an electrochemical reaction.

  In recent years, as one of new power generation systems, as disclosed in, for example, Patent Document 1 and Patent Document 2, a fuel cell device that can easily generate power has been considered. Such a fuel cell device includes an oxidizer, a fuel cell that generates power by a gas electrochemical reaction, and the like as basic components. In addition, in the above basic configuration, in order to smoothly operate each component, various auxiliary devices such as a reformer, a purifier for removing unnecessary substances in water to be sent to the fuel cell, and an ion exchanger. Equipment is in place.

Japanese Patent Laid-Open No. 3-108266 JP 2008-277308 A

However, in the above configuration, the temperature of the gas introduced into the oxidizer needs to be changed to a predetermined temperature, and condensed water is generated by condensation of the vapor contained in the gas. When this condensed water flows into the oxidizer, the oxidation reaction is hindered, and gas that does not sufficiently remove carbon monoxide is supplied to the fuel cell, so that it is necessary to discharge the condensed water. Further, since it is necessary to take out the gas and to take in the gas for the oxidation reaction, complicated piping is required, resulting in an increase in piping cost and a significant deterioration in assemblability .

In view of the above problems, the present invention provides a fuel cell device that does not hinder the oxidation reaction, further reduces the cost of piping, and can be miniaturized without sacrificing assembly. This is the first purpose .

  In the fuel cell device according to claim 1 of the present invention, the temperature of the gas is changed by the heat exchanger, the water condensed in the heat exchanger is separated and discharged by the separator, and the gas not containing the condensed water is oxidized. To be introduced. Therefore, it is possible to prevent water from entering the oxidizer and inhibiting the oxidation reaction.

In the fuel cell device according to claim 1 or 2 of the present invention, the condensed water and the gas introduced into the separator flow only in the predetermined direction in the process of being guided in the predetermined direction, and only the gas is different from the predetermined direction. In the direction and sent to the oxidizer. Therefore, it is possible to reliably prevent water from entering the oxidizer and inhibiting the oxidation reaction.

In the fuel cell device according to claim 1 of the present invention, the gas flow path after gas-liquid separation is integrally provided with a gas outlet for desulfurization reaction and a gas inlet for oxidation reaction, so that complicated piping is provided. It becomes unnecessary and simplified, and it is possible to reduce the piping cost and improve the assemblability, and to reduce the size .

  According to claim 1 of the present invention, it is possible to provide a fuel cell device that does not inhibit the oxidation reaction.

According to claim 1 or 2 of the present invention, it is possible to provide a fuel cell device capable of reliably preventing water from entering the oxidizer and inhibiting the oxidation reaction.

According to the first aspect of the present invention, it is possible to provide a fuel cell device that can be reduced in size without sacrificing assembly while simultaneously reducing the cost related to piping .

It is detailed explanatory drawing of the fuel cell apparatus of this invention. It is a block block diagram which shows the outline of a fuel cell apparatus same as the above. It is a perspective view which shows the external appearance of a fuel cell apparatus same as the above. It is an external appearance perspective view of a gas-liquid separator same as the above. FIG. 5 is a cross-sectional view taken along line AA of FIG. 4 showing the internal structure of the gas-liquid separator.

  Hereinafter, a preferred embodiment of a fuel cell device according to the present invention will be described with reference to the accompanying drawings. In FIG. 1 showing the configuration of this apparatus, reference numeral 1 denotes a booster blower for boosting fuel gas, and a desulfurizer 2 made of activated carbon or the like is connected to a discharge port of the booster blower 1. The outlet of the desulfurizer 2 is connected to an inlet of a reformer 3 composed of a reforming section made of a catalyst and a burner section for heating the reforming section. The inlet of the CO shift reactor 4 consisting of Furthermore, the outlet of the CO shift reactor 4 as a reactor is connected to the inlet of a heat exchanger 6 using cold water from the outlet of a circulation pump 5 as a refrigerant as a refrigerant, and the outlet of the heat exchanger 6 is a gas-liquid separator. 7 is connected to the inlet of a CO selective oxidizer 8 made of a catalyst. The outlet of the CO selective oxidizer 5 as an oxidizer is connected to the anode 10 of the fuel cell 9, and the outlet of the anode 10 is connected to the burner portion of the reformer 3.

  The fuel cell 9 sandwiches an electrolyte membrane 12 made of a solid polymer between an anode 10 and a cathode 11 as an electrode carrying a catalyst, and sends fuel gas and air to each of the anode 7 and the cathode 8. A separator (not shown) in which the flow path is formed is provided. Reference numeral 14 denotes an air blower as an air supply device, which is connected to the cathode 11 of the fuel cell 9, and a burner air blower 15, which is another air supply device, is connected to the burner portion of the reformer 3. Further, a selective oxidation air blower 16, which is still another air supply device, is connected to the CO selective oxidizer 8 via the gas-liquid separator 5. Each of these air blowers 14, 15, 16 takes in air through an air purification device 17.

  A gas port of the cathode 11 constituting the fuel cell 9, that is, an outlet of the cathode exhaust gas, is connected to a gas port of a heat exchanger 21 that uses exhaust heat as a heat recovery device. Further, a purification device 22 made of a filter (pore diameter 1 micron), an ion exchange device 23 made of an ion exchange resin, and a water pump 24 are sequentially connected to the exhaust heat utilization heat exchanger 21. The discharge port of the water pump 24 is branched in two directions, one discharge port is connected to the anode 10 of the fuel cell 9, and the other discharge port is connected to the reformer 3 via the water vapor generating heat exchanger 25. Connected to the entrance.

  The outlet of the combustion exhaust gas in the burner section constituting the reformer 3 is connected to the inlet of the heat exchanger 25 for generating steam. The combustion exhaust gas from the burner portion of the reformer 3 is connected to the gas port of the cathode 11 of the fuel cell 9 through the heat exchanger 25 for generating steam, so that the cathode from the fuel cell 9 Together with the exhaust gas, it is sent to the exhaust heat utilization heat exchanger 21.

  27 is an electromagnetic valve for controlling the inflow of city water, and its outlet sequentially passes through the heat exchanger 6 and the exhaust heat utilization heat exchanger 21 and is connected to a hot water inlet 29 of a hot water storage tank 28 which is a heat utilization external device. These are connected to the hot water inlet 31 of the heat dissipation device (cooling module) 30, respectively. Reference numeral 32 denotes a hot water outlet of the hot water tank 28. The cold water outlet 33 of the hot water storage tank 28 and the cold water outlet 34 of the heat dissipation device 30 are connected to the inlet of the circulation pump 5 via a three-way valve 35, and the outlet of the circulation pump 5 is discharged via the heat exchanger 6. It is connected to the heat utilization heat exchanger 21. The heat dissipating device 30 is provided with a heat dissipating fan 36, which cools the hot water introduced into the heat dissipating device 30 by forced convection of air taken from outside and discharges it as cold water from the cold water outlet 34. Further, reference numeral 37 denotes a ventilation fan as a blower that discharges the air in the outer package 38 of the fuel cell apparatus shown in FIG. 3 to the outside by forced convection.

  In addition, although not shown in FIG. 1, as shown in FIG. 2 later, auxiliary devices such as sensors, controllers, and switches (for example, solenoid valves) for controlling the flow and temperature of gas, air, and water are used. 41, an inverter 42 for converting the DC generated power obtained by the fuel cell 9 into AC power, a control device (not shown) for controlling the operation of the device, and the like are also arranged and connected in the device.

  FIG. 2 shows a schematic configuration of the entire apparatus, in which 43 is a reformer that generates hydrogen gas from fuel gas (raw fuel) such as natural gas, and this reformer 43 is a booster blower 1 shown in FIG. , A desulfurizer 2, a reformer 3, a CO shift reactor 4, a heat exchanger 6, a gas-liquid separator 7, a CO selective oxidizer 8, a steam generating heat exchanger 25, and the like.

  Oxygen from the air blower 14 serving as an air supply device for supplying oxygen (air) as an oxidant gas and hydrogen gas from the reforming device 43 cause an electrochemical reaction in the fuel cell 9, and power is generated in the fuel cell 9. Is supposed to do. Reference numeral 42 denotes an inverter as a power conversion device that converts electric energy (DC power) generated in the fuel cell 9 into AC power having a commercial voltage and frequency. Heat (exhaust gas) generated in the reformer 43 and the fuel cell 9 is recovered by a recovery device, that is, a waste heat utilization heat exchanger 21 that is a heat recovery device, and can be connected to a heat exchanger (not shown) that is an exchanger. It is supplied to an external heat utilization device such as a hot water storage tank 28 as a water heater or a floor heating device. In addition, in order to operate each of these components smoothly, auxiliary equipment 41 such as a pump, a solenoid valve, and a controller as a controller for controlling these pump and solenoid valve is provided.

  4 and 5 show the gas-liquid separator 7. As described above, the gas-liquid separator 7 is connected between the heat exchanger 6 and the CO selective oxidizer 8, and drains the condensed water obtained by the heat exchanger 6 cooling the fuel gas. A mechanism is provided. Specifically, the gas-liquid separator 7 here includes a straight main pipe 51 that extends in the vertical direction and one end connected to the upper side surface of the main pipe 51 and is selected from the selective oxidizing air blower 16. In order to take in the air for the oxidation reaction, a straight first branch pipe 52 having an open inlet 52A at the other end, one end is connected to the substantially central side surface of the main pipe 51, and the heat exchanger 6 In order to take in the mixed fluid of the condensed water and the fuel gas, a straight second branch pipe 53 having an open inlet 53A at the other end and one end positioned in a circumferential direction different from the inlet 53A The third branch pipe 54 connected to the substantially central side surface of the main pipe 51 and bent into an L shape having an open outlet 54A at the other end in order to take out the desulfurization reaction gas to the desulfurizer 2. It consists of. A separation piece 55 having an L-shaped cross section is formed inside the main pipe 51 so as to surround the other end of the second branch pipe 53. The separation piece 55 partially forms a guide channel 56 that communicates with the other end of the second branch pipe 53 and opens downward in the main pipe 51. It communicates with a channel 57 in the vertical direction, which is another part in the main pipe 51.

  Further, an outlet 58 of condensed water separated in the main pipe 51 is formed at one end, that is, the lower end of the main pipe 51, and the fuel gas separated in the main pipe 51 is formed at the other end, that is, the upper end of the main pipe 51. An outlet 59 is formed. The outlet 58 is connected to the inlet of the purification device 22, and the outlet 59 is connected to the inlet of the CO selective oxidizer 8.

  Next, the structure of the purification device 22 and the ion exchange device 23 in the above embodiment will be described in more detail with reference to FIGS. 6 and 7. Here, the above-described water passes through the mesh body 61 having a large number of openings, the holding body 63 that holds the mesh body 62, and the inner lid 65 that holds the mesh body 64 having another large number of openings. While constituting the purification device 22, an ion exchange device 23 connected to the purification device 22 is constituted by an ion exchange resin (not shown) and a hollow cylindrical column 66 filled with the ion exchange resin. The column 66 as a cylindrical body may have a shape other than a cylinder.

  The holding body 63 has a substantially annular shape so as to surround the mesh body 62, and a plurality of elastically deformable claws 71 which are engaged with and disengaged from the inner lid 65 are provided on the outer peripheral portion thereof. Corresponding to the claw 71, a hook-like fitting portion 72 is formed at the lower portion of the inner lid 65, and a flange that comes into contact with the upper end of the column 66 when the inner lid 65 closes one end of the column 66. 73 is formed at an intermediate portion of the inner lid 65. Further, a cap-shaped mounting portion 74 for mounting the mesh body 64 is formed on the inner lid 65 so as to protrude above the flange 73.

  Here, the inner lid 65 is provided with a mesh body 64 as a conventional purifying section, and a claw 71 of the holding body 63 which is a separate part is press-fitted and fitted into the fitting section 72 of the inner lid 65. The purification device 22 having the two mesh bodies 62 and 64 is assembled. By simply press-fitting the claw 71 of the holding body 63 into the fitting portion 72 of the inner lid 65, the holding body 63 is positioned with respect to the inner lid 65 having the mesh body 64, and the center of the holding body 63 including the mesh body 62 is misaligned. Can be prevented.

  Further, after the purification device 22 is assembled, when the claw 71 of the holding body 63 is inserted into the inner wall surface of the column 66 and the purification device 22 is mounted on the ion exchange device 23, the column 66 is fixed to the claw 71. In other words, it is desirable to have a shape that prevents the opening. In this embodiment, the inner wall surface of the column 66 that abuts on the outer surface of the claw 71 and restricts the opening of the claw 71 to the outside corresponds to the stopper, thereby preventing the purification device 22 from being detached after assembly. Can be prevented. By inserting the purification device 22 from one side of the column 66 to the position where the flange 73 of the inner lid 65 abuts against one end of the column 66 against the elasticity of the claw 71, The assembly of 22 is completed. At this time, the inner wall surface of the column 66 presses the claw 71 from the outside, and the purification device 22 can be prevented from being detached from the column 66 after assembly. Further, after the inner lid 65 is assembled to the column 66, a flow path 75 is formed from the mesh body 64 of the inner lid 65 through the mesh body 62 of the holding body 63 to the column 66.

  Note that the mesh diameters (opening widths) of the mesh bodies 62 and 64 in the present embodiment are both 155 μm. This is because the number of other mesh bodies 62 is increased as compared with the mesh body 64 having a conventional structure alone, so that the opening area can be increased to about 28 times, and clogging of the mesh bodies 62 and 64 can be effectively suppressed. .

  Further, in the fuel cell device having the above-described configuration, the burner exhaust gas outlet (not shown) of the reformer 43 is positioned higher than the burner exhaust gas inlet (not shown) of the exhaust heat utilization heat exchanger 21 that is a heat recovery device. It may be provided. Further, the cathode exhaust gas outlet (not shown) of the fuel cell 9 may be provided at a position higher than the cathode exhaust gas inlet (not shown) of the exhaust heat utilization heat exchanger 21 that is a heat recovery device. Furthermore, a burner exhaust gas pipe (not shown) that connects between a burner exhaust gas outlet (not shown) of the reformer 43 and a burner exhaust gas inlet (not shown) of the exhaust heat utilization heat exchanger 21 that is a heat recovery device. ) May be inclined to the exhaust heat utilization heat exchanger 11 side so as to have a downward slope. Further, a cathode exhaust gas pipe (not shown) that connects between a cathode exhaust gas outlet (not shown) of the fuel cell 9 and a cathode exhaust gas inlet (not shown) of the exhaust heat utilization heat exchanger 21 that is a heat recovery device. May be inclined to the exhaust heat utilization heat exchanger 21 side so as to have a downward slope.

  Next, the effect | action is demonstrated about the said structure. When the operation as the fuel cell device is started, the fuel gas enters the booster blower 1 of the reformer 43 to be pressurized and sent to the desulfurizer 2. Here, sulfur contained in the fuel gas is removed by the adsorption action of the desulfurizing agent. In this embodiment, activated carbon is used as the desulfurizing agent. However, other catalysts may be used as long as the sulfur contained in the fuel gas can be removed. The purpose of removing the sulfur content by the desulfurizer 2 is to prevent the subsequent catalyst such as the reformer 3 from being deteriorated by the fuel sulfur content.

  The fuel gas that has passed through the desulfurizer 2 is mixed with the steam generated in the steam generating heat exchanger 25 and enters the reforming section of the reformer 3. This reforming section is heated to about 750 ° C. by the burner section, and the fuel gas is changed into hydrogen gas and carbon dioxide (carbon dioxide) by the action of the catalyst. However, although the gas produced here contains a little amount of carbon monoxide, the performance of the polymer electrolyte fuel cell 9 described later is significantly reduced by carbon monoxide. Must be below a certain value.

  The fuel gas that has passed through the reformer 3 enters the next CO shift reactor 4, where carbon monoxide reacts with water vapor by the action of the catalyst to change into hydrogen gas and carbon dioxide, and the carbon monoxide The concentration drops to a fairly low level. When the fuel gas that has passed through the CO shift reactor 4 passes through the next heat exchanger 6, city water sent through the opened electromagnetic valve 27 or cold water sent from the circulation pump 5. Thus, it is cooled to a required temperature and sent out to the gas-liquid separator 7 as a mixed fluid of condensed water and fuel gas. In the gas-liquid separator 7, the condensed water is discharged from the mixed fluid, while the fuel gas not containing the condensed water is mixed with the air (oxygen) sent from the selective oxidizing air blower 16, and the CO selective reactor 8 is mixed. Thus, carbon monoxide contained in the mixed gas is converted into carbon dioxide by the action of the catalyst. At this time, the concentration of carbon monoxide contained in the fuel gas can be lowered to a concentration that does not adversely affect the fuel cell 9 for the first time.

  The fuel gas that has passed through the CO selective reactor 8 is sent to the anode 10 that is one electrode of the fuel cell 9. Air (oxygen) as an oxidant gas is fed into the cathode 11 as the other electrode by the air blower 14. Hydrogen in the anode 10 is ionized by the action of the catalyst, and is combined with oxygen on the cathode 11 side through the electrolyte membrane 12. Thereby, reaction heat is generated simultaneously with the generation of water. Further, due to this electrochemical reaction, a negative electrode potential is generated at the anode 10 and a positive electrode potential is generated at the cathode 11, and electric power can be taken out from the fuel cell 9.

  The fuel gas that has passed through the anode 10 consumes most of the hydrogen gas, but still contains a considerable concentration of hydrogen gas, which is returned to the burner section of the reformer 3 to burner air blower 15. It mixes with the air sent in by and burns in the burner part. Thereby, the remaining hydrogen gas can be used for raising the temperature of the reformer 3. In this way, the thermal energy possessed by the steam condensed water from the fuel cell 9 can be used efficiently.

The air that has passed through the cathode 11 has water (water vapor) generated in the fuel cell 9 and heat, and this air passes through the exhaust heat utilization heat exchanger 21 to return to water, and then this water is purified. Impurities are removed by passing through the device 22 . Further, in a state in which the electrolyte in the water is removed by the next ion exchange device 23, the water pump 24 sends the water to the anode 10 of the fuel cell 9 to humidify the solid polymer membrane (electrolyte membrane 12) and cool the fuel cell 9. Used for. Similarly, the water fed to the steam generating heat exchanger 25 by the water pump 24 is heated by the burner exhaust gas discharged from the burner portion of the reformer 3, becomes steam, and is reformed together with the fuel gas from the booster blower 1. Enter the reforming section of the mass device 3. At that time, the cathode exhaust gas outlet (not shown) of the fuel cell 9 is provided at a position higher than the cathode exhaust gas inlet (not shown) of the exhaust heat utilization heat exchanger 21 and the cathode exhaust gas pipe (not shown). Since the slanted pipe is inclined downward toward the exhaust heat utilization heat exchanger 21 side, the steam condensate passing through the cathode exhaust pipe (not shown) flows smoothly without flowing back in the middle. It is sent to the exhaust heat utilization heat exchanger 21. As a result, it is possible to prevent the steam condensate in the exhaust gas from flowing back to the fuel cell 9 and to enable safe operation without degrading the power generation performance.

  The burner exhaust gas that has passed through the water vapor generating heat exchanger 25 is sent together with the exhaust gas from the cathode 11 to the exhaust heat utilization heat exchanger 21 where the heat energy it has is released. Here, the burner exhaust gas outlet (not shown) of the reformer 43 is provided at a position higher than the burner exhaust gas inlet (not shown) of the exhaust heat utilization heat exchanger 21, and the burner exhaust gas pipe (see FIG. Is not inclined to the exhaust heat utilization heat exchanger 21 side, so that the steam condensate passing through the burner exhaust gas pipe (not shown) does not flow back in the middle and smoothly. To the exhaust heat utilization heat exchanger 21.

  In addition, the operation of the heat-utilizing external device including the hot water tank 28 will be described. First, the electromagnetic valve 27 is opened before the fuel cell device is operated, and the hot water tank 28 is filled with city water. Thereafter, when the operation of the fuel cell device is started, the circulation pump 5 is operated, and the cold water in the hot water storage tank 28 is sent to the heat exchanger 6 and the exhaust heat utilization heat exchanger 21 by the circulation pump 5, and the CO shift reactor 4 In addition to the fuel gas from, the heat energy of the exhaust gas from the cathode 11 of the fuel cell 9 and the burner portion of the reformer 3 is used to produce hot water. This hot water is sent from the exhaust heat utilization heat exchanger 21 to the hot water inlet 29 of the hot water storage tank 28 and returns to the hot water storage tank 28 again. The inside of the hot water storage tank 28 is in a two-layer state due to the difference in water temperature, and it is possible to use the hot water in the upper layer of the water storage tank 28.

  Further, if necessary, in order to cool the hot water from the exhaust heat utilization heat exchanger 21, the hot water is passed through the heat radiating device 30 in which the heat radiating fan 36 is operated, and the cooling water obtained here is passed through the three-way valve 35. Can be returned to the circulation pump 5.

  In the above series of operations, the gas (mixed fluid) containing the condensed water discharged from the heat exchanger 6 is taken into the second branch pipe 53 from the intake port 53A in the gas-liquid separator 7. The separator 7 once guides the gas containing the condensed water downward in the main pipe 51 by the guide passage 56 communicating with the second branch pipe 53, and then the inside of the main pipe 51 from the guide passage 56. When the flow path 57 is reached, the density difference between the condensed water and the fuel gas is utilized to cause only the condensed water to fall by its own weight, thereby promoting the separation of the condensed water and the fuel gas. Thereby, in the flow path 57 in the main pipe 51, the condensed water reaches the lower outlet 58 and is guided to the inlet of the purifier 22, while the fuel gas reaches the upper outlet 59 from which the CO is selected. It is led to the inlet of the oxidizer 8. As a result, only the fuel gas that does not contain condensed water is sent to the CO selective oxidizer 8, and water penetrates into the CO selective oxidizer 8, thereby eliminating the conventional problem that inhibits the oxidation reaction by the catalyst. Can do.

  On the other hand, in the main pipe 51, a first branch pipe 52 and a third branch pipe 54 are connected to a gas flow path 57 after gas-liquid separation located above the opening of the guide flow path 56, respectively. Therefore, the fuel gas containing no condensed water separated in the main building 51 is desulfurized as a desulfurization reaction gas from the main pipe 51 which is a common pipe through the third branch pipe 54 as well as the CO selective oxidizer 8. Can be sent to the vessel 2. Further, in the upper portion of the main pipe 51, air for selective oxidation reaction from the selective oxidation air blower 16 is sent through the first branch pipe 52, and this fuel gas containing no condensed water joins in the flow path 57. Thus, the main pipe 51 which is a common pipe can be sent to the CO selective oxidizer 8.

  As described above, in this embodiment, the temperature of the fuel gas sent out from the CO shift reactor 4 is lowered, for example, in the fuel cell device that generates power by the electrochemical reaction between the fuel gas and the oxidant gas which are both gases. And a heat exchanger 6 that condenses water vapor contained in the fuel gas, a condensed water that is water as a liquid, and a gas that is a fuel gas as a gas. The gas-liquid separator 7 as a separator for separating the water is provided in the preceding stage of the CO selective oxidizer 8 that is an oxidizer, and the condensed water is drained by the heat exchanger 6 and the gas-liquid separator 7 to condense. The fuel gas not containing water is sent to the CO selective oxidizer 8.

  In this case, after the temperature of the fuel gas is changed by cooling or the like by the heat exchanger 6, the water condensed by the heat exchanger 6 is separated and discharged by the gas-liquid separator 7, and the fuel gas does not contain condensed water. Is introduced into the CO selective oxidizer 8. Therefore, it is possible to prevent water from entering the CO selective oxidizer 8 and inhibiting the oxidation reaction.

  Further, the gas-liquid separator 7 in the present embodiment guides the fuel gas containing the condensed water downward in a predetermined direction, for example, and then discharges the fuel gas after the gas-liquid separation different from the predetermined direction, for example, upward. Specifically, a separation piece 55 is formed in a main pipe 51 arranged in the vertical direction, and the separation piece 55 guides fuel gas containing condensed water downward, thereby A guide channel 56 is formed to be sent to the channel 57 in the pipe 51.

  In this way, the condensed fluid introduced into the gas-liquid separator 7 and the fuel gas mixed fluid, for example, by using the density difference between the two, the condensed water alone is dropped by its own weight in the process of being guided downward in a predetermined direction. After flowing in a predetermined direction, only the fuel gas is discharged upward in a direction different from the predetermined direction, and sent to the CO selective oxidizer 8 at the subsequent stage. Therefore, it is possible to reliably prevent water from entering the CO selective oxidizer 8 and inhibiting the oxidation reaction.

  Furthermore, in this embodiment, the fuel gas flow path 57 after gas-liquid separation has a third branch pipe 54 having an outlet 54A that is a gas outlet for desulfurization reaction in the desulfurizer 2, and a CO selective oxidizer. 8 is integrally provided with a first branch pipe 52 having an intake 52A which is a gas inlet for oxidation reaction.

  In this way, the gas flow path 57 after gas-liquid separation is integrally provided with the desulfurization reaction outlet 54A and the oxidation reaction inlet 52A, so that complicated piping in the gas-liquid separator 7 can be obtained. It becomes unnecessary and simplified, and the piping cost can be reduced and the assemblability can be improved, and the size of the gas-liquid separator 7 can be reduced by integrating the piping.

  In this embodiment, in a fuel cell device that generates power by an electrochemical reaction between a fuel gas that is a gas and an oxidant gas, a column 66 as a storage body that stores and fills an ion exchange resin as an ion exchanger. The purification device 22 is constituted by this, and the purification device 22 and the holding body 63 as a purification body having the mesh body 62 as a mesh form a flow path 75 for purifying water as a fluid and removing electrolyte in the water. The holding body 63 is accommodated, for example, by press-fitting in an inner lid 65 that is a lid with another mesh body 64, and a stopper portion of the holding body 63 is formed on the inner wall surface of the column 66, for example.

  In this case, the mesh body 62 provided on the holding body 63 can prevent the ion exchange resin from leaking from the column 66, and the purification device 22 can be used as the flow path 75 of liquid or the like together with the column 66. Further, in the purification device 22 in which the holding body 63 is accommodated in the inner lid 65, in addition to the mesh body 62 as a mesh portion provided in the inner lid 65, another mesh body 64 is provided as a mesh of the holding body 63. Therefore, the mesh area in the flow path 75 is increased, and clogging in the mesh bodies 62 and 64 can be prevented. Furthermore, the simple assembly of only storing the holding body 63 in the inner lid 65 can prevent the purification device 22 from being misaligned with respect to the inner lid 65, and after the purification device 22 is assembled to the column 66, the holding body. The stop portion 63 functions as a detachment stop for the purification device 22, and the detachment of the purification device 22 and thus the inner lid 65 can be prevented.

  In addition, this invention is not limited to the said Example, It can change in the range which does not deviate from the meaning of this invention. For example, the structures of the purification device 22 and the ion exchange device 23 described in FIGS. 6 and 7 may be applied to a fuel cell device that does not include the heat exchanger 6 and the gas-liquid separator 7 in FIG. In this case, the outlet of the electromagnetic valve 27 is directly connected to the inlet of the exhaust heat utilization heat exchanger 21, and the air from the air blower 14 is input to the CO selective oxidizer 8 and also to the gas-liquid separator 7. The air flow path including the selective oxidizing air blower 16 is omitted.

6 Heat exchanger 7 Gas-liquid separator (separator)
8 Oxidizer (CO selective oxidizer)
57 Channel 52A Inlet (Gas Inlet)
54A Outlet (Gas outlet)

Claims (2)

In a fuel cell device that generates electricity by an electrochemical reaction between air and fuel gas, a heat exchanger that changes the temperature of the fuel gas and condenses water vapor, and is provided at a stage subsequent to the heat exchanger, and the condensed water and the fuel and a separator for separating a mixed fluid of gas, provided before the oxidizer to reduce the concentration of carbon monoxide, a structure for draining the condensed water by said separator and said heat exchanger,
The separator extends in the vertical direction, and has a straight main pipe formed with a lower outlet and an upper outlet at one end and the other end, respectively , and one end connected to the upper side surface of the main pipe to take in air a first branch pipe which is open at the other end to one end connected to a substantially central side surface of the main pipe, a second branch pipe which is open at the other end to incorporate the mixed fluid, the second the branch pipes are connected are located in different circumferential direction substantially in the center side of the main, constituted by a third branch pipe having an open gas outlet of the desulfurizing reaction in the other end, from the fluid mixture The fuel cell device , wherein the separated condensed water is guided to the lower outlet, and the fuel gas separated from the mixed fluid is guided to the upper outlet . The separator further includes a separation piece provided inside the main pipe so as to surround an end portion of the second branch pipe , and the separation piece forms a guide channel, and the second branch pipe is connected to the second branch pipe. guided downwardly intake was the mixed fluid by the guide passage, a fuel cell system according to claim 1, wherein that you separated into the fuel gas and the condensed water.

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