Enclosure for power generation unit and power generation set

Abstract

This enclosure for a power generation unit is for accommodating a power generation unit that includes a power generator and a drive device which generates a driving force for rotational driving of the power generator by burning fuel, said enclosure comprising: an enclosure body part that includes a base part on which the power generation unit is mounted, a side wall part which is provided on the base part so as to surround the power generation unit, and a roof part which is provided above the side wall part; an air supply port that is for taking air into an internal space of the enclosure body part surrounded by the base part, the side wall part, and the roof part; an exhaust port that is for discharging air from the internal space; and a push-type ventilation fan that is configured to push air into the internal space of the enclosure body part, wherein the air pushed from the ventilation fan is guided to the internal space via an upper end of the side wall part, and the ventilation fan is provided below the upper end of the side wall part.

Description

Technical Field

[0001] The present disclosure relates to an enclosure for a power generation unit and a power generation set.

[0002] The present application claims priority based on Japanese Patent Application No. 2023-050486 filed in Japan on March 27, 2023, the contents of which are incorporated herein by reference.Background Art

[0003] A transportable power generation set that accommodates a generator, a device for driving the generator, and the like inside an enclosure has been proposed.

[0004] For example, PTL 1 discloses a package-type power generation device in which a generator, an engine for driving the generator, and a fan for supplying air from the outside of a package to the inside of the package are accommodated inside the package (enclosure).Citation ListPatent Literature

[0005] [PTL 1] Japanese Unexamined Patent Application Publication No. 2011-202523Summary of InventionTechnical Problem

[0006] Meanwhile, since the ventilation fan includes a rotating part and an electric motor, a spark may be generated in the ventilation fan due to static electricity or the like. When the fuel gas leaks inside the enclosure and the concentration of the fuel gas locally increases in the vicinity of the ventilation fan, a spark generated by the ventilation fan may become an ignition source, and combustion explosion may occur. In particular, in a case where a combustible fuel such as hydrogen is used, there is a high need to reduce such a risk.

[0007] In view of the above circumstances, an object of at least one embodiment of the present invention is to provide an enclosure for a power generation unit and a power generation set capable of effectively reducing a risk of combustion explosion caused by leakage of a fuel gas.Solution to Problem

[0008] According to at least one embodiment of the present invention, there is provided an enclosure for a power generation unit in which the enclosure is for accommodating a power generation unit including a generator and a drive device for generating a driving force for rotationally driving the generator by combusting a fuel, the enclosure including: an enclosure body portion including a foundation portion on which a power generation unit is placed, a side wall portion provided on the foundation portion to surround the power generation unit, and a roof portion provided above the side wall portion; an air supply port for taking air into an internal space of the enclosure body portion surrounded by the foundation portion, the side wall portion, and the roof portion; an exhaust port for discharging air from the internal space; and a push-in type ventilation fan configured to push air into the internal space of the enclosure body portion, in which the air pushed in from the ventilation fan is guided to the internal space through an upper end of the side wall portion, and the ventilation fan is provided below the upper end of the side wall portion.

[0009] In addition, according to at least one embodiment of the present invention, there is provided a power generation set including: a power generation unit including a generator and a drive device for generating a driving force for rotationally driving the generator by combusting a fuel; and the above-described enclosure for a power generation unit in which the enclosure is for accommodating the power generation unit. Advantageous Effects of Invention

[0010] According to at least one embodiment of the present invention, there are provided an enclosure for a power generation unit and a power generation set capable of effectively reducing a risk of combustion explosion caused by leakage of a fuel gas. Brief Description of Drawings

[0011] FIG. 1 is a schematic cross-sectional view of a power generation set according to an embodiment as viewed from a side. FIG. 2 is a schematic cross-sectional view of the power generation set shown in FIG. 1 as viewed in a plan view. FIG. 3 is a perspective view showing an exterior of a part of the power generation set shown in FIG. 1. FIG. 4 is an enlarged view showing a part of the power generation set shown in FIG. 1. FIG. 5 is an enlarged view showing a part of the power generation set shown in FIG. 2. Description of Embodiments

[0012] Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. Dimensions, materials, shapes, relative dispositions, and the like of components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely explanatory examples.

[0013] FIG. 1 is a schematic cross-sectional view of a power generation set according to an embodiment as viewed from a side. FIG. 2 is a schematic cross-sectional view of the power generation set shown in FIG. 1 as viewed in a plan view. FIG. 3 is a perspective view showing an exterior of a part of the power generation set shown in FIG. 1.

[0014] As shown in FIGS. 1 and 2, a power generation set 1 according to the embodiment includes a power generation unit 10 including a generator 38 and a drive device 35, and an enclosure 2 for accommodating the power generation unit 10. In addition, the power generation set 1 shown in FIGS. 1 and 2 includes an exhaust unit 4 for exhausting combustion exhaust gas from the drive device 35 to an outside of the enclosure 2.

[0015] The generator 38 includes a rotor that is connected to an output shaft of the drive device 35, and is rotationally driven by the drive device 35.

[0016] The drive device 35 is configured to generate a driving force for rotationally driving the generator 38 by combusting a fuel. For example, the drive device 35 may be an internal combustion engine such as a reciprocating engine or a gas turbine engine. In the exemplary embodiment shown in FIGS. 1 and 2, the drive device 35 is a reciprocating engine 36 that includes a combustion chamber 40 including one or more cylinders and a crank chamber 42 that accommodates a rotary shaft. A turbocharger 44 is provided in the engine 36.

[0017] The fuel combusted by the drive device 35 may be gas lighter than air, and may be, for example, hydrogen gas.

[0018] The drive device 35 includes an air supply duct 48 for guiding air inside the enclosure 2 to the combustion chamber 40, a fuel pipe 52 for guiding a fuel gas to the combustion chamber 40, and an exhaust pipe 50 for discharging combustion exhaust gas from the combustion chamber 40. An air supply filter 46 is provided at an inlet of the air supply duct 48. The fuel pipe 52 includes an internal pipe portion 54 provided inside the enclosure 2 and an external pipe portion 56 provided outside the enclosure 2.

[0019] As shown in FIGS. 1 and 2, the internal pipe portion 54 may be provided with one or more valves 57 for adjusting the flow of the fuel gas in the internal pipe portion 54. The one or more valves 57 may include a shutoff valve 58. As shown in FIGS. 1 and 2, the valve 57 may be supported by a stand (valve skid) 60 (60A, 60B) provided inside the enclosure 2.

[0020] As shown in FIGS. 1 to 3, the enclosure 2 includes an enclosure body portion 8 for accommodating the power generation unit 10, an air supply port 12 for taking air into an internal space of the enclosure body portion 8, and an exhaust port 14 for discharging air from the internal space of the enclosure body portion 8.

[0021] The enclosure body portion 8 includes a foundation portion 16 on which the power generation unit 10 is placed, a side wall portion 18 provided on the foundation portion 16 to surround the power generation unit 10, and a roof portion 24 provided above the side wall portion 18 to cover the power generation unit 10. The internal space of the enclosure body portion 8 is a space surrounded by the foundation portion 16, the side wall portion 18, and the roof portion 24. In the exemplary embodiments shown in FIGS. 1 to 3, the side wall portion 18 includes a pair of long portions 19 extending along a longitudinal direction of the enclosure body portion 8, and short portions (an air supply side portion 20 and an exhaust side portion 22 to be described later) connecting the pair of long portions 19 to each other. The output shaft of the drive device 35 or the rotary shaft of the generator 38 may be provided to extend along the longitudinal direction of the enclosure body portion 8.

[0022] In the exemplary embodiments shown in FIGS. 1 to 3, the enclosure 2 includes an air supply hood 30 that is provided outside the enclosure body portion 8 and that forms an air supply port 12. The air that has entered the enclosure 2 from the air supply port 12 is introduced into the internal space of the enclosure body portion 8 through an inlet opening 26 of the enclosure body portion 8. As shown in FIGS. 1 to 3, the inlet opening 26 may be at least partially formed by an upper end 20a of the air supply side portion 20 of the side wall portion 18 and a lower surface 25 of the roof portion 24.

[0023] In the exemplary embodiments shown in FIGS. 1 to 3, the enclosure 2 includes an exhaust duct 32 that is provided outside the enclosure body portion 8 and that forms the exhaust port 14. The air inside the enclosure body portion 8 is guided to the exhaust duct 32 through an outlet opening 28 of the enclosure body portion 8, and is discharged from the exhaust port 14 to the outside of the enclosure 2. As shown in FIGS. 1 to 3, the outlet opening 28 may be at least partially formed by an upper end 22a of the exhaust side portion 22 of the side wall portion 18 and the lower surface 25 of the roof portion 24.

[0024] As shown in FIGS. 1 to 3, the enclosure 2 may include a ventilation fan 34 for ventilating the inside of the enclosure 2. That is, the ventilation fan 34 may introduce outside air into the enclosure 2 and discharge the air inside the enclosure 2 to the outside.

[0025] As shown in FIGS. 1 and 2, a partition plate 37 may be provided at a position between the air supply port 12 and the exhaust port 14 in a plan view in the internal space of the enclosure 2. The partition plate 37 may have a portion that extends at least partially along an up-down direction and may be configured to guide the air introduced from the air supply port 12 into the internal space of the enclosure 2 to flow downward. The partition plate 37 shown in FIG. 1 includes a lower end portion extending along the up-down direction. In addition, the partition plate 37 shown in FIG. 1 includes an upper end portion having a shape that is curved to approach the inlet opening 26 as going upward.

[0026] As shown in FIGS. 1 and 2, a partition plate 29 may be provided at a position between the air supply duct 48 and the internal pipe portion 54 (fuel pipe 52) in a plan view in the internal space of the enclosure 2. The partition plate 29 may be provided to extend along the up-down direction. The partition plate 29 may be provided over a region including the air supply duct 48 and the internal pipe portion 54 in the up-down direction.

[0027] The exhaust unit 4 includes a silencer 78 provided outside the enclosure 2, and a connection pipe portion 72 for guiding the combustion exhaust gas from the drive device 35 to the silencer 78. In addition, the exhaust unit 4 includes an outlet pipe portion 80 connected to the silencer 78. The combustion exhaust gas from the silencer 78 is released to the atmosphere through the outlet opening 82 of the outlet pipe portion 80. The silencer 78 shown in FIG. 1 is supported by a support table 84.

[0028] As shown in FIG. 1, the exhaust unit 4 including the silencer 78 is provided on a foundation portion 70. The foundation portion 70 may be different from the foundation portion 16 in which the enclosure 2 is provided. In this case, the foundation portion 16 in which the enclosure 2 is provided and the foundation portion 70 in which the exhaust unit 4 is provided can be separately transported by being loaded on separate vehicles or the like.

[0029] Hereinafter, the enclosure 2 and the power generation set 1 according to some embodiments will be described in more detail with reference to FIGS. 4 and 5. FIGS. 4 and 5 are enlarged views showing a part of the power generation set shown in FIGS. 1 and 2.

[0030] In some embodiments, for example, as shown in FIG. 4, the lower surface 25 of the roof portion 24 of the enclosure body portion 8 includes an inclined portion 23 having an ascending slope toward the exhaust port 14. That is, in the inclined portion 23, the position of the lower surface 25 in the up-down direction increases as the lower surface 25 approaches the exhaust port 14.

[0031] In the above-described embodiment, the lower surface 25 of the roof portion 24 forming the enclosure body portion 8 includes the inclined portion 23 having the ascending slope toward the exhaust port 14. Therefore, even if the fuel gas leaks in the internal space of the enclosure body portion 8 during the operation or the stop of the power generation unit 10, the lightweight fuel gas that has risen in the internal space and reached the lower surface 25 of the roof portion 24 can be smoothly flowed toward the exhaust port 14 along the inclined portion 23 having an ascending slope, and can be discharged to the outside of the enclosure 2 through the exhaust port 14. As described above, according to the above-described embodiment, since the accumulation of the leaked fuel gas inside the enclosure 2 can be suppressed, the risk of combustion explosion can be effectively reduced even in a case where the fuel gas leaks.

[0032] In some embodiments, for example, as shown in FIG. 4, the inclined portion 23 includes a highest position of the lower surface 25 of the roof portion 24. In the exemplary embodiment shown in FIG. 4, an end portion 25b of the lower surface 25 of the roof portion 24 located on an exhaust port 14 side is located at the highest position. In addition, the end portion 25b of the lower surface 25 of the roof portion 24 on the exhaust port 14 side forms the outlet opening 28 of the enclosure body portion 8.

[0033] In the above-described embodiment, the inclined portion 23 includes the highest position of the lower surface 25 of the roof portion 24. That is, since the lower surface 25 of the roof portion 24 has an ascending slope up to the highest position, the lightweight fuel gas that has risen in the internal space of the enclosure body portion 8 and reached the lower surface 25 of the roof portion 24 can be more smoothly caused to flow toward the exhaust port 14 along the inclined portion 23 having an ascending slope up to the highest position of the lower surface 25 of the roof portion 24. Therefore, according to the above-described embodiment, it is possible to more effectively suppress the accumulation of the leaked fuel gas inside the enclosure 2, and it is possible to effectively reduce the risk of combustion explosion even in a case where the fuel gas leaks.

[0034] In some embodiments, for example, as shown in FIG. 4, the inclined portion 23 extends from an end portion 25a on an air supply port 12 side to the end portion 25b on the exhaust port 14 side of the lower surface 25 of the roof portion 24. In the exemplary embodiment shown in FIG. 4, the end portion 25a of the lower surface 25 of the roof portion 24 on the air supply port 12 side forms the inlet opening 26 of the enclosure body portion 8.

[0035] In the above-described embodiment, since the inclined portion 23 has an ascending slope from the end portion 25a on the air supply port 12 side to the end portion 25b on the exhaust port 14 side of the lower surface 25 of the roof portion 24, the lightweight fuel gas that has risen in the internal space of the enclosure body portion 8 and reached the lower surface 25 of the roof portion 24 can be more smoothly caused to flow toward the exhaust port 14 along the inclined portion 23 having the ascending slope. Therefore, according to the above-described embodiment, it is possible to more effectively suppress the accumulation of the leaked fuel gas inside the enclosure 2, and it is possible to effectively reduce the risk of combustion explosion even in a case where the fuel gas leaks.

[0036] In some embodiments, the inclined portion 23 is formed of a smooth surface. The smooth surface forming the inclined portion 23 may include a flat surface and / or a curved surface.

[0037] In the above-described embodiment, the inclined portion 23 of the lower surface 25 of the roof portion 24 is formed of a smooth surface. That is, since there is no portion protruding or receding in the inclined portion 23 in the direction intersecting the inclined portion 23 (for example, the direction orthogonal to the inclined portion 23) on the lower surface 25 of the roof portion 24, the lightweight fuel gas that has risen in the internal space of the enclosure body portion 8 and reached the lower surface 25 of the roof portion 24 can be more smoothly caused to flow toward the exhaust port 14 along the inclined portion 23 having an ascending slope. Therefore, according to the above-described embodiment, it is possible to more effectively suppress the accumulation of the leaked fuel gas inside the enclosure 2, and it is possible to effectively reduce the risk of combustion explosion even in a case where the fuel gas leaks.

[0038] In some embodiments, the exhaust port 14 is located above the highest position of the lower surface 25 of the roof portion 24. For example, in the exemplary embodiment shown in FIG. 4, the exhaust duct 32 has a ceiling portion 33 located above the lower surface 25 of the roof portion 24 of the enclosure body portion 8, and the exhaust port 14 is provided in the ceiling portion 33.

[0039] According to the above-described embodiment, since the exhaust port 14 is located above the highest position of the lower surface 25 of the roof portion 24, the fuel gas flowing toward the exhaust port 14 along the inclined portion 23 having an ascending slope further rises from the highest position of the lower surface 25 of the roof portion 24 and is smoothly discharged from the exhaust port 14. Therefore, it is possible to more effectively suppress the accumulation of the leaked fuel gas inside the enclosure 2, and it is possible to effectively reduce the risk of combustion explosion even in a case where the fuel gas leaks.

[0040] In some embodiments, for example, as shown in FIGS. 4 and 5, the partition plate 37 provided in the internal space of the enclosure body portion 8 is provided above the generator 38 and the drive device 35 and at least partially at a position between the air supply port 12 and the exhaust port 14 in a plan view. Then, a gap 39 is formed between an upper end 37a of the partition plate 37 and the lower surface 25 of the roof portion 24.

[0041] In the above-described embodiment, the partition plate 37 that partitions the inside of the enclosure body portion 8 into the space on the air supply port 12 side and the space on the exhaust port 14 side is provided, and the gap 39 is formed between the partition plate 37 and the lower surface 25 of the roof portion 24. Therefore, since an air flow from the air supply port 12 toward the exhaust port 14 is formed along the lower surface 25 of the roof portion 24 through the gap 39, the leaked fuel gas is easily caused to flow toward the exhaust port 14 together with the air flow. Therefore, it is possible to more effectively suppress the accumulation of the leaked fuel gas inside the enclosure 2, and it is possible to effectively reduce the risk of combustion explosion even in a case where the fuel gas leaks.

[0042] In some embodiments, in a plan view, the combustion chamber 40 of the drive device 35 is located closer to the exhaust port 14 than the generator 38. In other words, in some embodiments, in a plan view, a distance between the exhaust port 14 and the combustion chamber 40 of the drive device 35 is shorter than a distance between the exhaust port 14 and the generator 38.

[0043] In the above-described embodiment, the combustion chamber 40 of the drive device 35 in which there is a possibility of fuel gas leakage is disposed relatively close to the exhaust port 14. Therefore, even if the fuel gas leaks from the combustion chamber 40 of the drive device 35, the lightweight fuel gas that has risen in the internal space of the enclosure 2 and reached the lower surface 25 of the roof portion 24 can be smoothly flowed toward the exhaust port 14 along the inclined portion 23 having an ascending slope, and can be discharged to the outside of the enclosure 2 through the exhaust port 14. As described above, according to the above-described embodiment, since the accumulation of the fuel gas leaking from the combustion chamber 40 of the drive device 35 inside the enclosure 2 can be suppressed, the risk of combustion explosion can be effectively reduced even in a case where the fuel gas leaks.

[0044] In some embodiments, in a plan view, an inlet 47 (in the shown example, an inlet of the air supply filter 46) of the air supply duct 48 is located closer to the air supply port 12 than the combustion chamber 40 of the drive device 35. In other words, in some embodiments, in a plan view, a distance between the air supply port 12 and the inlet 47 of the air supply duct 48 is shorter than a distance between the air supply port 12 and the combustion chamber 40 of the drive device 35.

[0045] In the above-described embodiment, since the inlet of the air supply duct 48 is disposed relatively close to the air supply port 12, even if the fuel gas leaks from the combustion chamber 40 of the drive device 35, the leaked fuel gas is less likely to enter the air supply duct 48 from the inlet 47 of the air supply duct 48. Therefore, in the air supply duct 48 or the like, it is possible to suppress unintentional accumulation of the leaked fuel gas, and it is possible to effectively reduce the risk of combustion explosion in the air supply duct 48 or the like.

[0046] In some embodiments, the ventilation fan 34 includes a push-in type ventilation fan configured to push air outside the enclosure 2 into the internal space of the enclosure body portion 8.

[0047] In the above-described embodiment, the push-in type ventilation fan that pushes the air outside the enclosure 2 into the enclosure is provided as the ventilation fan 34. Therefore, compared to a case where a suction type ventilation fan that sucks air inside the enclosure and discharges the air to the outside is used, the fuel gas leaking inside the enclosure 2 is less likely to come into contact with the ventilation fan that can be a generation source of an ignition source (spark, or the like). Therefore, even in a case where the fuel gas leaks inside the enclosure 2, the risk of combustion explosion can be effectively reduced.

[0048] In some embodiments, the push-in type ventilation fan 34 is provided below the upper end of the side wall portion 18 (in the shown example, the upper end 20a of the side wall portion 18 on the air supply side portion 20) outside the enclosure body portion 8. Then, the air pushed from the ventilation fan 34 is guided to the internal space of the enclosure body portion 8 through the upper end of the side wall portion 18 (upper end 20a of the air supply side portion 20).

[0049] In general, since the ventilation fan includes a rotating part and an electric motor, a spark may be generated in the ventilation fan due to static electricity or the like. When the fuel gas leaks inside the enclosure and the concentration of the fuel gas locally increases in the vicinity of the ventilation fan, a spark generated by the ventilation fan may become an ignition source, and combustion explosion may occur. In particular, in a case where a combustible fuel such as hydrogen is used, there is a high need to reduce such a risk.

[0050] In this regard, in the above-described embodiment, the push-in type ventilation fan 34 that pushes the air outside the enclosure 2 into the enclosure 2 is provided below the upper end of the side wall portion 18 of the enclosure body portion 8 (the upper end 20a of the air supply side portion 20), and the air pushed by the ventilation fan 34 is guided to the internal space of the enclosure body portion 8 through the upper end of the side wall portion 18 (the upper end 20a of the air supply side portion 20). Therefore, compared to a case where a suction type ventilation fan that sucks air inside the enclosure and discharges the air to the outside is used, the fuel gas leaking inside the enclosure 2 is less likely to come into contact with the ventilation fan 34 that can be a generation source of an ignition source (spark, or the like). In addition, it is less likely that the lightweight fuel gas leaks inside the enclosure 2 passes over the upper end of the side wall portion 18 (the upper end 20a of the air supply side portion 20) and enters a region below the upper end of the side wall portion 18 (the upper end 20a of the air supply side portion 20) outside the enclosure body portion 8. Therefore, according to the above-described embodiment, even in a case where the fuel gas leaks inside the enclosure 2, the risk of combustion explosion can be effectively reduced.

[0051] In some embodiments, the push-in type ventilation fan 34 is installed to be located below the combustion chamber 40 of the drive device 35 in the up-down direction.

[0052] In the above-described embodiment, the push-in type ventilation fan 34 is located below the combustion chamber 40 of the drive device 35. Therefore, even in a case where the fuel gas leaks from the combustion chamber 40, since the lightweight fuel gas rises from the combustion chamber 40, the fuel gas is less likely to come into contact with the ventilation fan 34. Therefore, even in a case where the fuel gas leaks from the combustion chamber 40 of the drive device 35 inside the enclosure 2, the risk of combustion explosion can be effectively reduced.

[0053] In some embodiments, the push-in type ventilation fan 34 is installed to be located below the fuel pipe 52 (the internal pipe portion 54 and / or the external pipe portion 56) for guiding the fuel to the combustion chamber 40 of the drive device 35 in the up-down direction.

[0054] According to the above-described embodiment, the ventilation fan 34 is located below the fuel pipe 52 (the internal pipe portion 54 and / or the external pipe portion 56) for guiding the fuel gas to the combustion chamber 40 of the drive device 35. Therefore, even in a case where the fuel gas leaks from the fuel pipe 52, since the lightweight fuel gas rises from the fuel pipe 52, the fuel gas is less likely to come into contact with the ventilation fan 34. Therefore, even in a case where the fuel gas leaks from the fuel pipe 52, the risk of combustion explosion can be effectively reduced.

[0055] In some embodiments, the push-in type ventilation fan 34 is provided inside the air supply hood 30 that is provided outside the enclosure body portion 8 and that forms the air supply port 12.

[0056] According to the above-described embodiment, the ventilation fan 34 is provided inside the air supply hood 30 separated from the internal space of the enclosure body portion 8 through the side wall portion 18 (air supply side portion 20 in the shown example) of the enclosure body portion 8. Therefore, even in a case where the fuel gas leaks inside the enclosure body portion 8, it is less likely that the lightweight fuel gas passes over the upper end of the side wall portion 18 (the upper end 20a of the air supply side portion 20) and enters a region below the upper end of the side wall portion 18 (the upper end 20a of the air supply side portion 20) in the air supply hood 30. Therefore, even in a case where the fuel gas leaks inside the enclosure 2, the risk of combustion explosion can be effectively reduced.

[0057] In some embodiments, the lower surface 25 of the roof portion 24 described above includes the inclined portion 23 in which a position in a height direction increases as the distance from the air supply port 12 increases.

[0058] In the above-described embodiment, the lower surface 25 of the roof portion 24 forming the enclosure body portion 8 includes the inclined portion 23 in which the position in the height direction increases as the distance from the air supply port 12 increases. Therefore, even if the fuel gas leaks in the internal space of the enclosure body portion 8 during the operation or the stop of the power generation unit 10, the lightweight fuel gas that has risen in the internal space and reached the lower surface 25 of the roof portion 24 can be caused to flow away from the air supply port 12 along the inclined portion 23 having an ascending slope. As described above, according to the above-described embodiment, the leaked fuel gas can be kept away from the ventilation fan 34 provided in the vicinity of the air supply port 12, and it is possible to effectively suppress the contact between the leaked fuel gas and the ventilation fan 34. Therefore, even in a case where the fuel gas leaks inside the enclosure 2, the risk of combustion explosion can be more effectively reduced.

[0059] In some embodiments, as already described, the partition plate 37 provided in the internal space of the enclosure body portion 8 is provided above the generator 38 and the drive device 35 and at least partially at a position between the air supply port 12 and the exhaust port 14 in a plan view, and the gap 39 is formed between the upper end 37a of the partition plate 37 and the lower surface 25 of the roof portion 24.

[0060] In the above-described embodiment, the partition plate 37 that partitions the inside of the enclosure body portion 8 into the space on the air supply port 12 side and the space on the exhaust port 14 side is provided, and the gap 39 is formed between the upper end 37a of the partition plate 37 and the lower surface 25 of the roof portion 24. Therefore, since an air flow from the air supply port 12 toward the exhaust port 14 is formed along the lower surface 25 of the roof portion 24 through the gap 39, the leaked fuel gas is easily caused to flow away from the air supply port 12 together with the air flow. Therefore, it is possible to more effectively suppress the contact between the leaked fuel gas and the ventilation fan 34, and it is possible to effectively reduce the risk of combustion explosion even in a case where the fuel gas leaks.

[0061] In some embodiments, the internal pipe portion 54 provided inside the enclosure body portion 8 is provided on a side opposite to the ventilation fan 34 with the side wall portion 18 (the air supply side portion 20 in the shown example) interposed therebetween in a plan view.

[0062] According to the above-described embodiment, the internal pipe portion 54 for guiding the fuel to the combustion chamber 40 of the drive device 35 is provided on the side opposite to the ventilation fan 34 with the side wall portion 18 (the air supply side portion 20) interposed therebetween in a plan view. Therefore, even in a case where the fuel gas leaks from the internal pipe portion 54, the fuel gas is less likely to come into contact with the ventilation fan 34 provided on the side opposite to the internal pipe portion 54 with the side wall portion 18 (the air supply side portion 20) being separated. Therefore, even in a case where the fuel gas leaks from the internal pipe portion inside the enclosure, the risk of combustion explosion can be effectively reduced.

[0063] In some embodiments, the internal pipe portion 54 and the external pipe portion 56 are provided on a side opposite to the ventilation fan 34 with the side wall portion 18 (the air supply side portion 20) interposed therebetween in a plan view. Alternatively, the internal pipe portion 54 and the external pipe portion 56 are provided on the side opposite to the ventilation fan 34 with the partition plate 37 interposed therebetween in a plan view.

[0064] According to the above-described embodiment, the internal pipe portion 54 and the external pipe portion 56 for guiding the fuel to the combustion chamber 40 of the drive device 35 are provided on the side opposite to the ventilation fan 34 with the partition plate 37 or the side wall portion 18 (the air supply side portion 20) interposed therebetween in a plan view. That is, since the internal pipe portion 54 and the external pipe portion 56 are provided at positions relatively far from the ventilation fan 34, even in a case where the fuel gas leaks from the internal pipe portion 54 or the external pipe portion 56, the fuel gas is less likely to come into contact with the ventilation fan 34 located relatively far from the internal pipe portion 54 and the external pipe portion 56. Therefore, even in a case where the fuel gas leaks from the internal pipe portion 54 or the external pipe portion 56, the risk of combustion explosion can be effectively reduced.

[0065] In some embodiments, the stand 60 (stand 60A or 60B in FIGS. 4 and 5) for supporting one or more valves 57 provided in the internal pipe portion 54 is provided on a side opposite to the ventilation fan 34 with the partition plate 37 interposed therebetween in a plan view.

[0066] In the above-described embodiment, the stand 60 for supporting the plurality of valves 57 provided in the internal pipe portion 54 in which there is a possibility of fuel gas leakage is disposed relatively far from the ventilation fan 34. Therefore, even if the fuel gas leaks from the valve 57 supported by the stand 60, the fuel gas is less likely to come into contact with the ventilation fan 34 located relatively far from the stand 60. Therefore, even in a case where the fuel gas leaks from the valve 57 supported by the stand 60 inside the enclosure 2, the risk of combustion explosion can be effectively reduced.

[0067] In some embodiments, in a plan view, the combustion chamber 40 of the drive device 35 is located farther from the ventilation fan 34 than the generator 38.

[0068] In the above-described embodiment, the combustion chamber 40 of the drive device 35 in which there is a possibility of fuel gas leakage is disposed relatively far from the ventilation fan 34. Therefore, even if the fuel gas leaks from the combustion chamber 40 of the drive device 35, the fuel gas is less likely to come into contact with the ventilation fan 34 located relatively far from the combustion chamber 40 of the drive device 35. Therefore, even in a case where the fuel gas leaks from the combustion chamber 40 of the drive device 35 inside the enclosure 2, the risk of combustion explosion can be effectively reduced.

[0069] For example, contents described in each of the above-described embodiments are understood as follows.

[0070] (1) According to at least one embodiment of the present invention, there is provided an enclosure (2) for a power generation unit in which the enclosure is for accommodating a power generation unit including a generator (38) and a drive device (35) for generating a driving force for rotationally driving the generator by combusting a fuel, the enclosure including: an enclosure body portion (8) including a foundation portion (16) on which a power generation unit is placed, a side wall portion (18) provided on the foundation portion to surround the power generation unit, and a roof portion (24) provided above the side wall portion; an air supply port (12) for taking air into an internal space of the enclosure body portion surrounded by the foundation portion, the side wall portion, and the roof portion; an exhaust port (14) for discharging air from the internal space; and a push-in type ventilation fan (34) configured to push air into the internal space of the enclosure body portion, in which the air pushed in from the ventilation fan is guided to the internal space through an upper end (20a) of the side wall portion (for example, the suction side portion 20 described above), and the ventilation fan is provided below the upper end of the side wall portion.

[0071] In the configuration of (1) above, the push-in type ventilation fan that pushes the air outside the enclosure into the enclosure is provided below the upper end of the side wall portion of the enclosure body portion, and the air pushed by the ventilation fan is guided to the internal space of the enclosure body portion through the upper end of the side wall portion. Therefore, compared to a case where a suction type ventilation fan that sucks air inside the enclosure and discharges the air to the outside is used, the fuel gas leaking inside the enclosure is less likely to come into contact with the ventilation fan that can be a generation source of an ignition source (spark, or the like). In addition, it is less likely that the lightweight fuel gas leaks inside the enclosure passes over the upper end of the side wall portion and enters a region below the upper end of the side wall portion outside the enclosure body portion. Therefore, according to the configuration of (1) above, even in a case where the fuel gas leaks inside the enclosure, the risk of combustion explosion can be effectively reduced.

[0072] (2) In some embodiments, in the configuration of (1) above, the ventilation fan is installed to be located below a combustion chamber (40) of the drive device.

[0073] According to the configuration of (2) above, the ventilation fan is located below the combustion chamber of the drive device. Therefore, even in a case where the fuel gas leaks from the combustion chamber, since the lightweight fuel gas rises from the combustion chamber, the fuel gas is less likely to come into contact with the ventilation fan. Therefore, even in a case where the fuel gas leaks from the combustion chamber of the drive device inside the enclosure, the risk of combustion explosion can be effectively reduced.

[0074] (3) In some embodiments, in the configuration of (1) or (2) above, the ventilation fan is installed to be located below a fuel pipe (for example, the internal pipe portion 54 described above) for guiding a fuel to a combustion chamber of the drive device.

[0075] According to the configuration of (3) above, the ventilation fan is located below the fuel pipe for guiding the fuel to the combustion chamber of the drive device. Therefore, even in a case where the fuel gas leaks from the fuel pipe, since the lightweight fuel gas rises from the fuel pipe, the fuel gas is less likely to come into contact with the ventilation fan. Therefore, even in a case where the fuel gas leaks from the fuel pipe inside the enclosure, the risk of combustion explosion can be effectively reduced.

[0076] (4) In some embodiments, in the configuration of any one of (1) to (3) above, the enclosure for a power generation unit further includes: an air supply hood (30) that is provided outside the enclosure body portion and that forms the air supply port, in which the ventilation fan is provided inside the air supply hood.

[0077] According to the configuration of (4) above, the ventilation fan is provided inside the air supply hood separated from the internal space of the enclosure body portion through the side wall portion of the enclosure body portion. Therefore, even in a case where the fuel gas leaks inside the enclosure body portion, it is less likely that the lightweight fuel gas passes over the upper end of the side wall portion and enters a region below the upper end of the side wall portion in the air supply hood. Therefore, even in a case where the fuel gas leaks inside the enclosure, the risk of combustion explosion can be effectively reduced.

[0078] (5) In some embodiments, in the configuration of any one of (1) to (4) above, a lower surface of the roof portion includes an inclined portion (23) in which a position in a height direction increases as a distance from the air supply port increases.

[0079] In the configuration of (5) above, the lower surface of the roof portion forming the enclosure body portion includes the inclined portion in which the position in the height direction increases as the distance from the air supply port increases. Therefore, even if the fuel gas leaks in the internal space of the enclosure body portion during the operation or the stop of the power generation unit, the lightweight fuel gas that has risen in the internal space and reached the lower surface of the roof portion can be caused to flow away from the air supply port along the inclined portion having an ascending slope. In this way, according to the configuration of (5) above, the leaked fuel gas can be kept away from the ventilation fan provided in the vicinity of the air supply port, and it is possible to effectively suppress the contact between the leaked fuel gas and the ventilation fan. Therefore, even in a case where the fuel gas leaks inside the enclosure, the risk of combustion explosion can be more effectively reduced.

[0080] (6) In some embodiments, in the configuration of (5) above, the enclosure for a power generation unit further includes: a partition plate (37) that is provided above the generator and the drive device in the internal space of the enclosure body portion and at least partially at a position between the air supply port and the exhaust port in a plan view, and extends at least partially along an up-down direction, in which a gap (39) is formed between an upper end (37a) of the partition plate and the lower surface of the roof portion.

[0081] In the configuration of (6) above, the partition plate that partitions the inside of the enclosure body portion into the space on the air supply port side and the space on the exhaust port side is provided, and the gap is formed between the partition plate and the lower surface of the roof portion. Therefore, since an air flow from the suction port toward the exhaust port is formed along the lower surface of the roof portion through the gap, the leaked fuel gas is easily caused to flow away from the air supply port together with the air flow. Therefore, it is possible to more effectively suppress the contact between the leaked fuel gas and the ventilation fan, and it is possible to effectively reduce the risk of combustion explosion even in a case where the fuel gas leaks.

[0082] (7) In some embodiments, in the configuration of any one of (1) to (6) above, in a fuel pipe (52) for guiding a fuel to a combustion chamber of the drive device, an internal pipe portion (54) provided inside the enclosure body portion is provided on a side opposite to the ventilation fan with the side wall portion interposed therebetween in a plan view.

[0083] According to the configuration of (7) above, the internal pipe portion for guiding the fuel to the combustion chamber of the drive device is provided on the side opposite to the ventilation fan with the side wall portion interposed therebetween in the plan view. Therefore, even in a case where the fuel gas leaks from the internal pipe portion, the fuel gas is less likely to come into contact with the ventilation fan provided on the side opposite to the internal pipe portion with the side wall portion being separated. Therefore, even in a case where the fuel gas leaks from the internal pipe portion inside the enclosure, the risk of combustion explosion can be effectively reduced.

[0084] (8) In some embodiments, in the configuration of (7) above, the fuel pipe includes the internal pipe portion and an external pipe portion (56) provided outside the enclosure body portion, and the internal pipe portion and the external pipe portion are provided on the side opposite to the ventilation fan with the side wall portion interposed therebetween in a plan view.

[0085] According to the configuration of (8) above, the internal pipe portion and the external pipe portion for guiding the fuel to the combustion chamber of the drive device are provided on the side opposite to the ventilation fan with the side wall portion interposed therebetween in a plan view. That is, since the internal pipe portion and the external pipe portion are provided at positions relatively far from the ventilation fan, even in a case where the fuel gas leaks from the internal pipe portion or the external pipe portion, the fuel gas is less likely to come into contact with the ventilation fan located relatively far from the internal pipe portion and the external pipe portion. Therefore, even in a case where the fuel gas leaks from the internal pipe portion or the external pipe portion, the risk of combustion explosion can be effectively reduced.

[0086] (9) According to at least one embodiment of the present invention, there is provided a power generation set (1) including: a power generation unit (10) including a generator and a drive device for generating a driving force for rotationally driving the generator by combusting a fuel; and the enclosure for a power generation unit (2) according to any one of (1) to (8) above in which the enclosure is for accommodating the power generation unit.

[0087] In the configuration of (9) above, the push-in type ventilation fan that pushes the air outside the enclosure into the enclosure is provided below the upper end of the side wall portion of the enclosure body portion, and the air pushed by the ventilation fan is guided to the internal space of the enclosure body portion through the upper end of the side wall portion. That is, the ventilation fan is provided below the upper end of the side wall portion outside the enclosure body portion. Therefore, compared to a case where a suction type ventilation fan that sucks air inside the enclosure and discharges the air to the outside is used, the fuel gas leaking inside the enclosure is less likely to come into contact with the ventilation fan that can be a generation source of an ignition source (spark, or the like). In addition, it is less likely that the lightweight fuel gas leaks inside the enclosure passes over the upper end of the side wall portion and enters a region below the upper end of the side wall portion outside the enclosure body portion. Therefore, according to the configuration of (9) above, even in a case where the fuel gas leaks inside the enclosure, the risk of combustion explosion can be effectively reduced.

[0088] (10) In some embodiments, in the configuration of (9) above, the power generation set further includes a valve (57) provided in an internal pipe portion provided inside the enclosure body portion, in a fuel pipe for guiding a fuel to a combustion chamber of the drive device; a stand (60) for supporting the valve; and a partition plate (37) that is provided at a position between the air supply port and the exhaust port in a plan view in an internal space of the enclosure body portion and extends at least partially along an up-down direction, in which in a plan view, the stand is provided on a side opposite to the ventilation fan with the partition plate interposed therebetween.

[0089] In the configuration of (10) above, the stand for supporting the plurality of valves provided in the internal pipe portion in which there is a possibility of fuel gas leakage is disposed relatively far from the ventilation fan. Therefore, even if the fuel gas leaks from the valve supported by the stand, the fuel gas is less likely to come into contact with the ventilation fan located relatively far from the stand. Therefore, even in a case where the fuel gas leaks from the valve supported by the stand inside the enclosure, the risk of combustion explosion can be effectively reduced.

[0090] (11) In some embodiments, in the configuration of (9) or (10) above, in a plan view, a combustion chamber (40) of the drive device is located farther from the ventilation fan than the generator.

[0091] In the configuration of (11) above, the combustion chamber of the drive device in which there is a possibility of fuel gas leakage is disposed relatively far from the ventilation fan. Therefore, even if the fuel gas leaks from the combustion chamber of the drive device, the fuel gas is less likely to come into contact with the ventilation fan located relatively far from the combustion chamber of the drive device. Therefore, even in a case where the fuel gas leaks from the combustion chamber of the drive device inside the enclosure, the risk of combustion explosion can be effectively reduced.

[0092] Although the embodiments of the present invention have been described, the present invention is not limited to the above-described embodiments, and includes modifications of the above-described embodiments and a combination of these embodiments as appropriate.

[0093] In the present specification, expressions representing relative or absolute dispositions such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric", and "coaxial" not only strictly represent the dispositions, but also represent a state where the dispositions are relatively displaced with a tolerance or at an angle or a distance to such an extent that the same function can be obtained.

[0094] For example, expressions representing that matters are in an equal state such as "same", "equal", and "homogeneous" not only strictly represent an equal state, but also represent a state where a difference exists with a tolerance or to such an extent that the same function can be obtained.

[0095] Further, in the present specification, expressions representing shapes such as a quadrangular shape and a cylindrical shape not only represent shapes such as a quadrangular shape and a cylindrical shape in a geometrically strict meaning, but also represent shapes including an uneven portion or a chamfered portion within a range where the same effect can be obtained.

[0096] Further, in the present specification, expressions such as "being provided with", "including", and "having" one component are not exclusive expressions excluding the presence of other components.Reference Signs List

[0097] 1: power generation set 2: enclosure 4: exhaust unit 8: enclosure body portion 10: power generation unit 12: air supply port 14: exhaust port 16: foundation portion 18: side wall portion 19: long portion 20: air supply side portion 20a: upper end 22: exhaust side portion 22a: upper end 23: inclined portion 24: roof portion 25: lower surface 25a: end portion 25b: end portion 26: inlet opening 28: outlet opening 29: partition plate 30: air supply hood 32: exhaust duct 33: ceiling portion 34: ventilation fan 35: drive device 36: engine 37: partition plate 37a: upper end 38: generator 39: gap 40: combustion chamber 42: crank chamber 44: turbocharger 46: air supply filter 47: inlet 48: air supply duct 50: exhaust pipe 52: fuel pipe 54: internal pipe portion 56: external pipe portion 57: valve 58: shutoff valve 60: stand 60A: stand 60B: stand 70: foundation portion 72: connection pipe portion 78: silencer 80: outlet pipe portion 82: outlet opening 84: support table

Claims

1. An enclosure for a power generation unit in which the enclosure is for accommodating a power generation unit including a generator and a drive device for generating a driving force for rotationally driving the generator by combusting a fuel, the enclosure comprising: an enclosure body portion including a foundation portion on which a power generation unit is placed, a side wall portion provided on the foundation portion to surround the power generation unit, and a roof portion provided above the side wall portion; an air supply port for taking air into an internal space of the enclosure body portion surrounded by the foundation portion, the side wall portion, and the roof portion; an exhaust port for discharging air from the internal space; and a push-in type ventilation fan configured to push air into the internal space of the enclosure body portion, wherein the air pushed in from the ventilation fan is guided to the internal space through an upper end of the side wall portion, and the ventilation fan is provided below the upper end of the side wall portion.

2. The enclosure for a power generation unit according to Claim 1, wherein the ventilation fan is installed to be located below a combustion chamber of the drive device.

3. The enclosure for a power generation unit according to Claim 1 or 2, wherein the ventilation fan is installed to be located below a fuel pipe for guiding a fuel to a combustion chamber of the drive device.

4. The enclosure for a power generation unit according to Claim 1 or 2, further comprising: an air supply hood that is provided outside the enclosure body portion and that forms the air supply port, wherein the ventilation fan is provided inside the air supply hood.

5. The enclosure for a power generation unit according to Claim 1 or 2, wherein a lower surface of the roof portion includes an inclined portion in which a position in a height direction increases as a distance from the air supply port increases.

6. The enclosure for a power generation unit according to Claim 5, further comprising: a partition plate that is provided above the generator and the drive device in the internal space of the enclosure body portion and at least partially at a position between the air supply port and the exhaust port in a plan view, and extends at least partially along an up-down direction, wherein a gap is formed between an upper end of the partition plate and the lower surface of the roof portion.

7. The enclosure for a power generation unit according to Claim 1 or 2, wherein, in a fuel pipe for guiding a fuel to a combustion chamber of the drive device, an internal pipe portion provided inside the enclosure body portion is provided on a side opposite to the ventilation fan with the side wall portion interposed therebetween in a plan view.

8. The enclosure for a power generation unit according to Claim 7, wherein the fuel pipe includes the internal pipe portion and an external pipe portion provided outside the enclosure body portion, and the internal pipe portion and the external pipe portion are provided on the side opposite to the ventilation fan with the side wall portion interposed therebetween in a plan view.

9. A power generation set comprising: a power generation unit including a generator and a drive device for generating a driving force for rotationally driving the generator by combusting a fuel; and the enclosure for a power generation unit according to Claim 1 or 2 in which the enclosure is for accommodating the power generation unit.

10. The power generation set according to Claim 9, further comprising: a valve provided in an internal pipe portion provided inside the enclosure body portion, in a fuel pipe for guiding a fuel to a combustion chamber of the drive device; a stand for supporting the valve; and a partition plate that is provided at least partially at a position between the air supply port and the exhaust port in a plan view in an internal space of the enclosure body portion and extends at least partially along an up-down direction, wherein in a plan view, the stand is provided on a side opposite to the ventilation fan with the partition plate interposed therebetween.

11. The power generation set according to Claim 9, wherein in a plan view, a combustion chamber of the drive device is located farther from the ventilation fan than the generator.

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