JP5116262B2 - Fuel cell device - Google Patents

Description

  The present invention relates to a fuel cell device in which a fuel cell is stored in a storage container having a support.

  In recent years, as a next-generation energy, development of fuel cells, in particular, fuel cells for home use or small-scale apartment buildings that supply household electricity by fuel cells has been actively performed. As functions required for a household fuel cell, performance such as high power generation performance is required, and further, a fuel cell device containing the fuel cell is required to be compact.

  Here, in order to improve the power generation performance of the fuel cell, it is necessary to remove impurities contained in the gas supplied to the fuel cell. As a fuel gas that is one kind of gas supplied to a household fuel cell, it is assumed that a fuel type that has already been developed as infrastructure in the home, such as city gas, is used.

  To the city gas supplied to the home, a odorant containing a sulfur component is added in order to prevent an accident when the gas leaks. When city gas or the like is passed through a reforming catalyst for obtaining hydrogen used for power generation of the fuel cell, the sulfur component contained in the city gas or the like reduces the activity of the reforming catalyst. It leads to. Therefore, a desulfurization device for removing sulfur components from city gas or the like is attached to the fuel cell device.

  Further, the fuel cell device houses components such as a fuel cell, a fuel reformer, a gas supply device, a water supply device, a desulfurization device, and a power conversion device. Therefore, in reducing the size of the fuel cell device, it is required to reduce the size of these component devices and to reduce the number of devices.

  For example, FIG. 5 shows an example of a fuel cell device 31 containing a solid oxide fuel cell. FIG. 5 shows an example in which the fuel cell 33 storing the fuel cell stack, the desulfurization device 34, and the like are stored in the storage container 32.

And it is proposed to reduce the size of a desulfurization device which is one of the devices constituting the fuel cell device (see, for example, Patent Document 1).
JP 2005-259584 A

  However, in the conventional fuel cell device, it is necessary to draw a gas supply pipe or the like for supplying various gases such as fuel gas and oxygen-containing gas to the fuel cell. Was inhibited.

  In addition, miniaturization of the fuel cell device has been hindered by auxiliary machines and the like housed in the fuel cell device.

  SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a fuel cell device that can be miniaturized and can eliminate at least a part of a gas supply pipe disposed in the fuel cell device. Furthermore, a fuel cell device that can be reduced in size is provided by reducing the number of auxiliary machines arranged in the fuel cell device.

The fuel cell device of the present invention is a fuel cell device in which a fuel cell is accommodated in a storage container, wherein the storage container includes a plurality of hollow struts, and the inside of the struts includes the fuel cell. The gas passage is supplied to the battery, and at least one of an impurity removing device and a desulfurization catalyst is provided inside the support column .

  In the fuel cell device of the present invention having such a configuration, gas such as air or fuel gas used for power generation of the fuel cell can be supplied through the inside (hollow portion) of the support column, and the fuel cell device can be made compact. Can be realized.

  That is, by effectively using the struts constituting the fuel cell device, for example, a part of a gas pipe or the like for supplying gas to the fuel cell becomes unnecessary. In addition, since the other constituent devices can be arranged in the region where the gas pipes and the like that have become unnecessary are stored, the fuel cell device can be reduced in size.

Then, impurity when Ru provided impurity removing device inside the post, the air and fuel gas, a gas used for power generation of the fuel cell, only supplied through the interior of the strut, contained in the gas such as air or fuel gas Can be removed.

Further, when the impurity removing device Ru provided inside the strut, since it is unnecessary to separately provide an impurity removing device for removing impurities contained in a gas such as air or fuel gas, reducing the size of the fuel cell system it can.

And if a desulfurization catalyst is provided in the inside of a support | pillar, while being able to desulfurize the sulfur component contained in a fuel reliably, a fuel cell apparatus can be reduced in size.

  When performing desulfurization treatment for removing sulfur components from fuel gas, which is one type of gas supplied to a household fuel cell, for example, when desulfurization is performed using an adsorptive desulfurization method, a container filled with a desulfurization catalyst is brought to room temperature. Therefore, desulfurization can be performed at low cost because desulfurization is possible by simply flowing gas. However, since this desulfurization method is a desulfurization method with a relatively low desulfurization capacity, a huge amount of desulfurization catalyst is required for use over a long period of time, and accordingly, the desulfurization apparatus is enlarged.

  On the other hand, when the desulfurization device is downsized to reduce the size of the fuel cell device, the life of the desulfurization catalyst is shortened, and the replacement timing of the desulfurization catalyst is advanced, resulting in an increase in maintenance costs and high costs.

In the present invention, the inside of the post that constitutes the housing container Ru provided desulfurization catalyst, by supplying a fuel gas into the strut, since it is possible to reliably desulfurizing a sulfur component contained in the fuel gas Thus, it is possible to prevent the performance of the fuel cell from being lowered without lowering the activity of the reforming catalyst.

  Furthermore, since the sulfur component contained in the fuel gas can be desulfurized by the support, it is not necessary to separately provide a desulfurization apparatus for desulfurizing the sulfur component contained in the fuel gas. Therefore, the fuel cell device can be reduced in size.

The fuel cell device of the present invention, the interior of the strut are the supply path of the fuel gas, it is preferable that a room temperature desulfurization type desulfurization catalyst is provided as the desulfurization catalyst in the interior of the strut.

  In the fuel cell device of the present invention having such a configuration, the sulfur component contained in the fuel gas can be reliably desulfurized at low cost by providing a room temperature desulfurization type desulfurization catalyst.

  That is, since a large amount of a room temperature desulfurization type desulfurization catalyst can be accommodated in the column, the sulfur component contained in the fuel can be efficiently desulfurized for a long period of time.

In the fuel cell device of the present invention, it is preferable that the inside of the support column is a supply path for an oxygen-containing gas, and a filter is provided as the impurity removing device inside the support column.

  With such a configuration, impurities contained in an oxygen-containing gas such as air can be reliably removed, and the fuel cell device can be downsized.

  Air, which is one type of gas supplied to a household fuel cell, may contain fine impurities such as dust and dust, and such fine impurities are used to supply air. There is a risk of clogging the inside of the battery, and there is a risk of deteriorating the power generation of the fuel cell stack. Therefore, it is preferable to store a device for removing impurities in the air in the storage container. However, in this case, there is a problem that the fuel cell device is enlarged.

Here, by providing a filter as an impurity removing device for removing impurities in the oxygen-containing gas such as air inside the support column, by supplying the oxygen-containing gas inside the support column, for example, in the oxygen-containing gas It is possible to remove fine impurities such as dust and dust contained in the gas, and prevent such fine impurities from clogging the inside of the oxygen-containing gas supply pipe and from deteriorating the power generation performance of the fuel cell. can do.

  Furthermore, since the impurities contained in the oxygen-containing gas can be reliably removed by the filter in the support column, it is not necessary to separately provide a device for removing the impurities contained in the oxygen-containing gas. Therefore, the fuel cell device can be reduced in size.

  In the fuel cell device of the present invention, the strut is a double pipe in which a fuel gas supply pipe for supplying fuel gas is arranged inside an oxygen-containing gas supply pipe for supplying oxygen-containing gas. A structure is preferred.

  In the fuel cell device of the present invention having such a configuration, impurities contained in the fuel gas and the oxygen-containing gas can be reliably removed and the power generation of the fuel cell can be performed efficiently. Furthermore, it becomes possible to reduce the size of the fuel cell device.

  That is, for example, when the desulfurization catalyst for desulfurizing the sulfur component from the fuel gas is a desulfurization catalyst used in the adsorptive desulfurization method, it is known that the catalyst activity of the desulfurization catalyst decreases as the temperature increases. . Therefore, when the desulfurization catalyst used in this adsorptive desulfurization method is used, it is necessary to prevent the temperature of the fuel gas supply pipe from rising. For example, an oxygen-containing gas blower that flows an oxygen-containing gas for cooling the desulfurization catalyst ( For example, an air blower) is required.

  In the present invention, since the oxygen-containing gas supply pipe for supplying the oxygen-containing gas is arranged outside the fuel gas supply pipe for supplying the fuel gas, the oxygen-containing gas supply pipe is supplied. The oxygen-containing gas that has a cooling effect on the fuel gas supply pipe. Further, for example, when the fuel cell device is installed outdoors, the oxygen-containing gas is supplied to the outside of the fuel gas supply pipe with respect to the temperature rise of the support column due to direct sunlight. Will play a role.

  Accordingly, the structure of the column is a double pipe structure in which a fuel gas supply pipe for supplying fuel gas is arranged inside an oxygen-containing gas supply pipe for supplying oxygen-containing gas. Since the temperature increase of the gas supply pipe can be prevented, the activity of the desulfurization catalyst can be prevented from decreasing, and the power generation of the fuel cell can be performed efficiently.

  Further, there is no need to separately provide an oxygen-containing gas blower for preventing the temperature of the fuel gas supply pipe from rising. Therefore, the fuel cell device can be reduced in size. It is also possible to reduce costs.

  Furthermore, in the case of a double pipe structure in which the shape of the support column is formed by forming a fuel gas supply pipe for supplying fuel gas inside an oxygen-containing gas supply pipe for supplying oxygen-containing gas, The fuel gas supply pipe can be kept at room temperature close to room temperature.

  Therefore, by providing a room temperature desulfurization type desulfurization catalyst in the fuel gas supply pipe, the sulfur component contained in the fuel gas can be desulfurized more efficiently.

The fuel cell device of the present invention is a fuel cell device in which a fuel cell is accommodated in a storage container, wherein the storage container includes a plurality of hollow struts, and the inside of the struts includes the fuel cell. It is a passage for gas supplied to the battery, and at least one of the impurity removal device and the desulfurization catalyst is provided inside the support column, so that a part of a gas pipe or the like for supplying gas to the fuel cell Since the other constituent devices can be arranged in the region where the gas pipes and the like that have become unnecessary are stored, the fuel cell device can be downsized.

  FIG. 1 is a view showing a fuel cell device 1 according to the present invention, and is a schematic view in which the front plate of the storage container 2 is removed so that the inside of the storage container 2 can be seen.

The fuel cell system 1, four posts 3 and the plate-like member (top plate 2a, a bottom plate 2 c and the outer plate 2 b) to the interior of the container 2 that is configured by assembling the fuel cell support member 4 The storage container 2 is divided into an upper space 5 and a lower space 6, a fuel cell 7 is stored in the upper space 5, and auxiliary devices such as a blower and an inverter are stored (not shown) in the lower space 6. The

  Since the storage container 2 is required to be compact in a household fuel cell, for example, the width of the storage container 2 is a size that can accommodate the fuel cell 7, and preferably a width that is equivalent to the fuel cell 7. The height is preferably set to a size that can accommodate the fuel cell 7 and auxiliary equipment. In addition, the fuel cell in the present invention refers to a fuel cell stack in which a fuel cell stack is stored in a storage case.

Furthermore, the container 2 is four posts 3, top plate 2a made of a metal or plastics material such as stainless steel or aluminum, the bottom plate 2 c and four outer plates 2 b, the heat resistance of the adhesive It is configured to be fixed to the column 3 with screws and screws. Incidentally, the top plate 2a, a bottom plate 2 c and four outer plates 2 b, the influence and the heat due to power generation of the fuel cell, taking into account the influence of air temperature when it is installed outside, heat-resistant metal such as Is preferably used.

  The support column 3 has a function of supporting the top plate 2 a of the storage container 2 and reinforcing the strength of the storage container 2. In FIG. 1, four cylindrical support columns 3 are provided.

  Here, the inside of the support column 3 is hollow, and the gas supplied from the gas supply port 8 is discharged from the gas discharge port 9. The discharged gas is subsequently supplied to the fuel cell 7 and used for power generation of the fuel cell.

  As for the gas supplied to the fuel cell 7, for example, when the supplied gas is a fuel gas, hydrogen is generated as fuel for power generation of the fuel cell by a reformer or the like, and is used for power generation of the fuel cell (stack). Is done. Further, when the supplied gas is an oxygen-containing gas, it is used for power generation of the fuel cell (stack).

  Normally, gas such as air or fuel gas is supplied from the outside of the storage container 2, then passes through a gas supply pipe such as an air supply pipe or a gas supply pipe, and then a fuel cell by a gas supply pump or an air supply blower. 7 is supplied.

  In FIG. 1, the inside of one strut 3 is hollow, and the gas supplied from the outside of the fuel cell device 1 passes through the inside of the strut 3 from the gas supply port 8 of the strut 3 to the gas discharge port 9. The gas is discharged from the column and supplied to the fuel cell 7 through a gas supply pipe or the like. A gas flow path (gas supply pipe) through which the gas discharged from the discharge port 9 is supplied to the fuel cell 7 is indicated by a dashed arrow.

  And since the gas supplied from the outside of the fuel cell apparatus 1 is supplied to the fuel cell 7 through the support | pillar 3, at least one part (or all in some cases) of a gas supply pipe becomes unnecessary.

  Here, for example, in FIG. 1, the gas discharge port 9 is provided in the lower portion of the support column 3, but the gas discharge port 9 may be provided so as to be connected to the gas supply port of the fuel cell 7. In that case, at least a part of the gas supply pipe becomes unnecessary.

  Further, when the gas discharge port 9 is connected to the gas supply port of the fuel cell 7, the fuel cell 7 is accommodated in the upper space 5. The outlet 9 may be provided on the upper side of the column 3.

  Here, in FIG. 1, the gas supply port 8 is provided toward the inside of the storage container 2. For example, since the gas is supplied from the outside of the fuel cell device 1, the supplied gas is directly supplied. In order to supply the gas to the inside of the column 3, the gas supply port 8 may be provided toward the outside of the storage container 2 and directly connected to a gas supply pipe supplied from the outside of the fuel cell device 1. In this case, at least a part of the gas supply pipe is further unnecessary. In addition, although the storage container 2 has shown the case of square pillar shape in FIG. 1, the shape should just match | combine the structure of fuel cell 7 grade | etc., For example, cylindrical shape etc. may be sufficient.

  FIG. 2 is an enlarged view of another example of the support column 3. In FIG. 2, the support column 3 has a rectangular tube shape. As in FIG. 1, the column 3 has a gas supply port 8 and a gas discharge port 9.

Here, when the support column 3 is formed into a square cylinder shape, the square column-shaped support column 3 may be provided at the corner portion of the storage container 2. For example, the corner portion formed by the exterior plate 2 b of the storage container 2. Is L-shaped, and the shape of the support column 3 can be L-shaped and combined with the L-shaped corners to form a rectangular tube shape, and the plate shape constituting the storage container 2 When joining to this member, the support column 3 can also be formed in a U shape. Therefore, the shape of the column 3 is appropriately set depending on the place to be joined.

  Furthermore, in the present invention, it is preferable that an impurity removing device is provided inside the column 3.

  For example, fuel gas and oxygen-containing gas (air, etc.) used for power generation of a fuel cell contain impurities such as sulfur components, dust and dust. When these impurities are supplied to the fuel cell without being removed, there is a possibility that the performance of the fuel cell may be lowered due to, for example, a reduction in the function of the reforming catalyst included in the reformer.

  Therefore, in the present invention, it is more preferable to provide not only the inside (hollow part) of the support column 3 as a gas passage used in the fuel cell but also an impurity removing device inside the support column 3.

  By providing the impurity removing device inside the column 3, not only can impurities contained in the gas be removed, but there is no need to separately provide an impurity removing device for removing impurities contained in the gas. The lower space 6 of the storage container 2 can be reduced in size, and consequently the fuel cell device 1 can be reduced in size.

  Here, for example, when the inside of the column 3 is a gas supply path, it is preferable to provide a desulfurization catalyst in order to remove sulfur components contained in the odorant of the fuel gas.

  When the desulfurization catalyst is provided inside the support column 3, not only when the desulfurization catalyst itself is filled in the support column 3, but also a catalyst case filled with the catalyst can be stored in the support column 3. When the catalyst itself is filled into the support column 3, the support column 3 itself becomes a desulfurization apparatus.

  On the other hand, when the catalyst case is used, it is not necessary to use the above-mentioned cylindrical or square columnar pillars. For example, a grooved or L-shaped ore can be used, and the catalyst case is arranged along the pillars. You can also.

  Further, the desulfurization catalyst can be stored in the entire support column 3, but may be stored in a part thereof.

  As a result, the sulfur component contained in the fuel gas can be removed, so that it is possible to effectively prevent the function of the reforming catalyst contained in the reforming device that constitutes the fuel cell from being lowered, thereby improving the performance of the fuel cell. A decrease can be prevented.

  Furthermore, since the inside of the support column 3 is a gas supply path and a desulfurization catalyst is provided therein, at least a part of the gas supply pipe is not required, and it is not necessary to provide a separate desulfurization device. The lower space 6 of the storage container 2 can be reduced in size, and consequently the fuel cell device 1 can be reduced in size.

  As the desulfurization catalyst, it is preferable to use a room temperature desulfurization type desulfurization catalyst. In an environment where the inside of the support can be maintained at room temperature, the sulfur component contained in the fuel can be desulfurized more efficiently. In addition, as a room temperature desulfurization type desulfurization catalyst, activated carbon, a zeolite-type desulfurization catalyst, etc. can be used.

  Incidentally, the room temperature desulfurization catalyst requires a large amount of catalyst in order to maintain the desulfurization performance over a long period of time, but according to the present invention, the desulfurization catalyst can be accommodated inside the support column. Since it can be used as a support, a large amount of desulfurization catalyst can be used in a small space.

  On the other hand, for example, when the inside of the support column 3 is an oxygen-containing gas supply path, it is preferable to remove impurities such as pollen and salt in addition to dust and dust contained in the oxygen-containing gas.

  As a removal device for removing impurities in the oxygen-containing gas, for example, various filters such as a so-called dust collection filter, pollen / dust filter, sea salt particle removal filter and the like can be used. It can be selected and used as appropriate.

  Thereby, since impurities contained in oxygen-containing gas such as air can be removed, it is possible to prevent performance degradation of the fuel cell.

  Furthermore, since the inside of the column 3 is an oxygen-containing gas supply path and a filter is provided therein, at least a part of the gas supply pipe is not required, and for example, there is no need to separately provide a dust collector or the like. Therefore, the lower space 6 of the storage container 2 can be reduced in size, and as a result, the fuel cell device 1 can be reduced in size.

  Here, the fuel cell may be designed to be used for a long period of time, for example, tens of thousands of hours. In that case, for example, it is possible to remove impurities in the gas using a plurality of support columns.

  FIG. 3 shows an example in the case of using a plurality of support columns. FIG. 3 schematically shows the relationship between the support column 11 and the support column 12 by extracting them, seeing through the fuel cell 10 and clarifying the relationship between the support column 11 and the support column 12. .

  In FIG. 3, the case where gas is supplied from the upper part of the support | pillar 11 is shown. In this case, the gas supply port 13 is provided at the upper end portion of the support column 11, and the gas discharge port 14 is provided at the lower end portion of the support column 11. Similarly, in the support column 12, the gas supply port 15 is provided at the upper end portion of the support column 12, and the gas discharge port 16 is provided at the lower end portion of the support column 12. In FIG. 3, the gas flow (gas supply pipe) is indicated by a solid line arrow.

  By having such a structure, the gas supplied from the gas supply port 13 passes through the flow path inside the support column 11 and is discharged from the gas discharge port 14, and then the gas supply port of the support column 12 by a gas supply pipe or the like. 15 is supplied to the inside of the support column 12, further passes through the flow path inside the support column 12, is discharged from the gas discharge port 16, and is supplied to the fuel cell 10.

  Since the inside of the support | pillar 11 and the support | pillar 12 is provided with the desulfurization catalyst of normal temperature desulfurization type, for example, even if it is a case where the catalyst is insufficient for desulfurization with one support | pillar, several support | pillars, for example By using, desulfurization performance can be maintained for a long time.

  Further, even when removing impurities by combining a plurality of support columns as described above, it is not necessary to separately provide a desulfurization device, a dust collection device, or the like, so the lower space 6 of the storage container 2 can be reduced in size. As a result, the fuel cell device 1 can be reduced in size.

  Although FIG. 3 shows the case where two struts are used, it may be designed to remove gas impurities using three or more struts in accordance with the operating time of the fuel cell device. Good.

  FIG. 4 shows a double pipe structure in which an oxygen-containing gas supply pipe 18 for supplying an oxygen-containing gas and a fuel gas supply pipe 19 for supplying a fuel gas are arranged inside the column 17. This is a diagram schematically showing the relationship between the oxygen-containing gas supply pipe 18 and the fuel gas supply pipe 19.

  Here, the oxygen-containing gas is supplied from an oxygen-containing gas supply port 20 provided in the lower part of the oxygen-containing gas supply pipe 18, and is discharged from an oxygen-containing gas discharge port 21 provided in the upper part of the oxygen-containing gas supply pipe 18. Supplied to the fuel cell.

  The fuel gas is supplied from a fuel gas supply port 22 provided at the upper end of the fuel gas supply pipe 19, discharged from a fuel gas discharge port 23 provided at the lower end of the fuel gas supply pipe 19, and supplied to the fuel cell. The The supply port and the discharge port for the oxygen-containing gas and the fuel gas are appropriately arranged by the structure of the storage container and the fuel cell to be stored by an auxiliary machine or the like.

  Here, an adsorptive desulfurization method or the like is known as a method for desulfurizing a sulfur component contained in fuel gas. Although an adsorptive desulfurization catalyst can be used at room temperature, it is known that the catalytic activity decreases as the temperature during adsorption increases.

  Therefore, there is no particular problem as long as desulfurization can be performed in an environment where the appropriate temperature of the desulfurization catalyst to be used can be maintained, but due to external factors such as direct sunlight of the sun when the fuel cell device 1 is installed outdoors, for example. In an environment where the temperature rises or when heat generated by power generation of the fuel cell is transferred, the catalytic activity may decrease, and an oxygen-containing gas blower for preventing the temperature rise of the fuel gas supply pipe 19 is separately provided. Necessary.

  Here, by providing the fuel gas supply pipe 19 inside the oxygen-containing gas supply pipe 18, the oxygen-containing gas flowing inside the oxygen-containing gas supply pipe 18 has a cooling effect on the fuel gas supply pipe 19. In addition, the temperature of the fuel gas can be kept constant.

  Further, for example, when the fuel cell device 1 is installed outdoors, an oxygen-containing gas supply pipe 18 is provided outside the fuel gas supply pipe 19 to increase the temperature due to external factors such as direct sunlight of the sun. The gas will serve as a heat barrier layer.

  Therefore, the temperature rise of the fuel gas supply pipe 19 can be prevented, and the fuel gas supply pipe can be kept at a room temperature close to room temperature, so that the activity of the room temperature desulfurization type catalyst provided inside the fuel gas supply pipe 19 is increased. Can be effectively prevented from decreasing. Thereby, the sulfur component contained in the fuel component can be desulfurized more efficiently, and the power generation of the fuel cell can be performed efficiently.

  Further, by providing a filter inside the oxygen-containing gas supply pipe 18, it is possible to remove impurities in the fuel gas and the oxygen-containing gas inside the support column.

  Therefore, by adopting such a configuration, it is possible to remove impurities in the fuel gas and the oxygen-containing gas, so there is no need to separately provide a desulfurization device, a dust collection device, etc. Further, the temperature rise of the fuel gas supply pipe 19 Further, since an oxygen-containing gas blower for preventing the occurrence of this problem is not required, the lower space of the storage container can be reduced in size, and the fuel cell device can be further reduced in size.

It is a partially exploded perspective view which shows an example of the fuel cell apparatus of this invention. It is a perspective view which shows an example of the support | pillar of this invention. It is the figure which showed the example using two support | pillars. It is a partial perspective view which shows other embodiment of the support | pillar of this invention. It is a partially exploded perspective view which shows an example of the conventional fuel cell apparatus.

Explanation of symbols

1: fuel cell device 2: storage container 2 b : exterior plate 3: support column 4: fuel cell support member 5: upper space 6: lower space 7: fuel cell 8: gas supply port 9: gas discharge port

Claims (4)

A fuel cell device comprising housing the fuel cell storage container, the storage container is configured to include a plurality of hollow struts, inside the struts, passage of the gas supplied to the fuel cell And at least one of an impurity removal device and a desulfurization catalyst is provided inside the support column . Inside the strut are the supply path of the fuel gas, a fuel cell system according to claim 1, characterized that you have normal temperature desulfurization type desulfurization catalyst is provided as the desulfurization catalyst in the interior of the strut. The interior of the strut are the supply path of the oxygen-containing gas, a fuel cell system according to claim 1, characterized in that the filter is provided as the impurities removal apparatus in the interior of the strut. 2. The double column structure in which the support column has a double-pipe structure in which a fuel gas supply pipe for supplying fuel gas is arranged inside an oxygen-containing gas supply pipe for supplying oxygen-containing gas. The fuel cell device according to any one of claims 1 to 3 .

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