Filter device and filter installation / replacement method for filter device

Abstract

To provide a filter device and filter installation and replacement methods of the filter device where filter performance can be stably exhibited even under low flow velocity conditions.SOLUTION: A filter device comprises: a duct extending in an axial direction; a plurality of bag-shaped filter bodies being arranged in a circumferential direction around an axis line at intervals and being deformable by the flow of air flowing inside; a support fixation part supporting an edge part at the inner peripheral side of the filter bodies so as to be relatively non-movable to the duct; and a housing supporting the edge part at the inner peripheral side of the filter bodies.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a filter device and a method for installing and replacing a filter in a filter device. [Background technology]

[0002] For example, in facilities such as nuclear power plants, non-renewable energy sources are used to supply power in the event of a power outage. In such emergency power generation facilities, the internal combustion engines, etc. In most cases, a combustion engine is used. This emergency power generation equipment is designed to ensure that it starts up reliably in the event of a power outage. It is required that the power generation system can operate smoothly and generate electricity stably.

[0003] The following Patent Document 1 proposes a technology for improving starting performance and increasing the intake air filling rate in diesel generators for nuclear power plants by heating or cooling the intake air of the diesel engine when power is lost.

[0004] In general, diesel engines require a high level of atmospheric oxygen to ensure stable operation. Foreign matter is removed by an intake filter. The intake filter has a bag-shaped bag filter. As air flows into the bag filter, foreign matter contained in the air is captured. In the past, the downstream end of the bag filter was generally left free, without any fixing means. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 62-029720 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the downstream end of the bag filter is left free as described above, there is a risk that the bag filter may fold or twist when the air flow velocity is low, which results in an insufficient amount of air being drawn into the bag filter, hindering the performance of the filter device.

[0007] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a filter device that can exhibit stable filter performance even under low flow rate conditions, and a method for installing and replacing a filter in a filter device. [Means for solving the problem]

[0008] In order to solve the above problems, the filter device according to the present disclosure includes a duct extending in an axial direction, a plurality of bag-shaped filter bodies arranged radially at intervals in the circumferential direction around the axis X and deformable by the flow of air flowing therethrough, a support fixing part that supports the inner peripheral end of the filter body so that it cannot move relative to the duct, and a housing that supports the outer peripheral end of the filter body.

[0009] The filter installation / replacement method for a filter device according to the present disclosure is a filter replacement method for the above-mentioned filter device, and includes the steps of sequentially removing the filter body from the housing and the support fixing portion, and sequentially fixing a new filter body to the housing and the support fixing portion. [Effects of the Invention]

[0010] According to the present disclosure, it is possible to provide a filter device that can stably exhibit filter performance even under low flow rate conditions, and a method for installing and replacing a filter in a filter device. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a side view showing a configuration of a filter device according to a first embodiment of the present disclosure. [Figure 2]1 is a cross-sectional view showing a configuration of a filter device according to a first embodiment of the present disclosure. [Figure 3] 1 is a longitudinal cross-sectional view showing a configuration of a filter device according to a first embodiment of the present disclosure. [Figure 4] 3 is a flowchart showing steps of a filter installation / replacement method for a filter device according to a first embodiment of the present disclosure. [Figure 5] FIG. 2 is a cross-sectional view showing a first modified example of the filter device according to the first embodiment of the present disclosure. [Figure 6] FIG. 10 is a longitudinal cross-sectional view showing a second modified example of the filter device according to the first embodiment of the present disclosure. [Figure 7] 10A and 10B are schematic diagrams illustrating the configuration of a support fixing part and a filter body according to a second embodiment of the present disclosure. [Figure 8] 1 is a cross-sectional view showing the configuration of a filter device according to a reference example of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0012] First Embodiment (Configuration of filter device 1) A filter device 1 according to a first embodiment of the present disclosure will be described below with reference to Figures 1 to 4. This filter device 1 is installed in the intake system of a diesel engine or the like serving as an emergency power supply device installed in, for example, a nuclear power plant, and is used to prevent foreign matter such as volcanic ash from entering the intake system.

[0013] As shown in FIGS. 1 and 2, the filter device 1 includes a duct 10, a plurality of filter bodies 11, a plurality of metal mesh filters 12, a support fixing portion 13, and a housing 14.

[0014] The duct 10 has a cylindrical shape centered on an axis X extending in the vertical direction. An upper end of the duct 10 is connected to an intake system of a diesel engine or the like. A lower end of the duct 10 faces the bottom surface of the housing 14 with a space therebetween. A plurality of filter bodies 11 are arranged in this space. The filter bodies 11 are bag-shaped bag filters. The filter bodies 11 are formed integrally with, for example, filter cloth. As shown in FIG. 2 , a plurality of filter bodies 11 are arranged radially at intervals in the circumferential direction around the axis X. Specifically, each filter body 11 extends from a side surface 15 (described below) of the flat housing 14 toward the duct 10.

[0015] The inner peripheral end of the filter body 11 extends toward the position of the axis X of the duct 10. The outer peripheral end of the filter body 11 communicates with an opening 16 of the housing 14, which will be described later. The inner peripheral end of the filter body 11 is fixed to the duct 10 by a support fixing portion 13 so as not to move relative to the duct 10. As indicated by the dashed lines in FIG. 2 , the support fixing portion 13 has a plurality of (four) beam members 20 arranged to surround the duct 10 from the outer peripheral side. These beam members 20 are combined in directions perpendicular to each other to form a rectangular shape. The inner peripheral end of the filter body 11 is fixed to the beam members 20 by a fastening member such as an Insulock (registered trademark). The outer peripheral end of the filter body 11 is fixed to the inner surface of the housing 14.

[0016] With both ends of the filter body 11 fixed in this manner, the filter body 11 is slightly bent when viewed from the direction of the axis X. This is because a standard product is used as the filter body 11. Therefore, the filter body 11 closer to the duct 10 is bent more.

[0017] The housing 14 has a rectangular cross section that surrounds the duct 10 and the filter body 11 from the outer periphery. Openings 16 are formed on each side surface 15 of the housing 14 to allow outside air to enter the filter device 1. As an example, four openings 16 are formed on each side surface 15. A metal mesh filter 12 is disposed in each opening 16. The metal mesh filters 12 are provided to remove foreign matter with larger particle sizes before the foreign matter is captured by the filter body 11 described above.

[0018] As shown in FIG. 3, the inner peripheral end and the outer peripheral end of each filter body 11 are located at the same position in the direction of the axis X. That is, in a cross-sectional view including the axis X, the filter bodies 11 extend in a radial direction relative to the axis X. Note that "same" here refers to being substantially same, and manufacturing errors and the like are allowed for. Also, as shown in the same figure, a plurality of support fixing portions 13 are provided so as to surround the filter body 11 from both sides in the direction of the axis X. That is, the filter body 11 is fixed to one support fixing portion 13 on each side in the direction of the axis X.

[0019] (Filter installation and replacement method) Next, the filtering method of the filter device 1 will be described with reference to Fig. 4. First, in step S1, the connection between the existing filter body 11 and the support and fixing part 13 is released. At the same time, the connection between the housing 14 and the filter body 11 is also released. After that, the filter body 11 is removed to the outside and disposed of (step S2). Next, a new filter body 11 is placed in a predetermined position (step S3). In this state, the inner peripheral end and the outer peripheral end of the filter body 11 are fixed to the support and fixing part 13 and the housing 14, respectively. This completes all steps of the filter replacement method. When installing a filter, it is only necessary to perform the above step S3 as the filter installation method.

[0020] (Action and effect) Next, an example of a method of operating the filter device 1 will be described. To operate the filter device 1, first, a diesel engine or the like connected to the end of the duct 10 is started. This causes external air to flow into the duct 10 from the opening 16 of the filter device 1 toward the intake system of the diesel engine or the like. Along the way, foreign matter such as dust and volcanic ash contained in the air is removed by the metal mesh filter 12 and the filter body 11 (bag filter). Therefore, clean air flows through the duct 10.

[0021] When a bag filter such as filter body 11 is used, the downstream end of the bag filter has generally been left free without any fixing means. This is because the filter body 11 can maintain its shape by expanding due to the flow rate of air passing through it.

[0022] However, when the downstream end of the bag filter is a free end as described above, there is a risk that the bag filter may fold or twist when the air flow velocity is low. As a result, there is a problem that a sufficient amount of air cannot be taken into the bag filter, which impairs the performance of the filter device 1. Therefore, the present embodiment employs the above-described configurations.

[0023] According to the above configuration, the inner peripheral end of the filter body 11 is fixed by the support fixing portion 13 so as not to move relative to the duct 10. This prevents the inner peripheral end of the filter body 11 from sagging downward or twisting in the circumferential direction. Therefore, even when the flow rate of air flowing through the filter body 11 is low, the shape of the filter body 11 can be maintained, and the filter performance of the filter body 11 can be stably exhibited. As a result, the filter device 1 can be used under all conditions, further improving the versatility of the filter device 1.

[0024] Furthermore, with the above configuration, by sequentially fixing the inner peripheral end of the filter body 11 to the beam members 20 serving as the support and fixation portion 13, it is possible to easily and inexpensively maintain the shape of the filter body 11. In particular, because the support and fixation portion 13 can be formed simply by combining the beam members 20 into a simple rectangular shape, it is possible to reduce the number of parts and the number of manufacturing steps. Therefore, it is possible to significantly reduce the maintenance and manufacturing costs of the filter device 1.

[0025] In addition, with the above configuration, even when the filter body 11 is bent, the inner peripheral end is fixed by the support fixing portion 13, reducing the possibility of the filter body 11 being completely folded or twisted. This allows a standard filter body 11 to be easily applied to the filter device 1. On the other hand, if a non-standard filter body 11 is individually manufactured to construct the filter device 1, the manufacturing costs increase by the amount of the filter body 11. Furthermore, since the dimensions must be determined according to the installation position of the filter body 11, the number of manufacturing steps also increases. With the above configuration, this possibility is reduced, making it possible to manufacture and maintain the filter device 1 more inexpensively and easily.

[0026] Furthermore, according to the above-described filter installation and replacement method, the filter body 11 can be replaced more easily and quickly simply by removing the filter body 11 from the housing 14 and the support fixture 13. Furthermore, it is also easy to newly install a bag filter as the filter body 11 in an existing filter device 1 that has a mesh filter or the like other than the filter body 11. This allows the maximum use of existing facilities, thereby significantly reducing the maintenance costs of the plant to which the filter device 1 is applied.

[0027] The first embodiment of the present disclosure has been described above. Note that various changes and modifications can be made to the above configuration and method without departing from the gist of the present disclosure.

[0028] For example, as a first modification, as shown in FIG. 5, it is also possible to employ a configuration in which the inner peripheral ends of the plurality of filter bodies 11 are sequentially offset in one circumferential direction relative to the outer peripheral ends as viewed along the axis X. That is, each filter body 11 extends obliquely relative to the radial direction as viewed along the axis X. With this configuration, the inner peripheral ends and outer peripheral ends of the filter bodies 11 are offset in the circumferential direction, so that a circumferential swirling velocity component can be imparted to the air flow passing through the filter bodies 11. This reduces the pressure loss occurring in the air flow within the duct 10.

[0029] Furthermore, as a second modified example, as shown in FIG. 6 , it is also possible to adopt a configuration in which the inner peripheral end of the filter body 11 is offset to one side (upper side) in the axial direction X relative to the outer peripheral end, thereby being located at the outlet side of the duct 10. With this configuration, the inner peripheral end and the outer peripheral end of the filter body 11 are offset in the axial direction X, so that a velocity component in the axial direction X can be imparted to the air flow passing through the filter body 11. As a result, it is possible to arbitrarily control the air flow velocity in the duct 10 based on the extension direction of the filter body 11. This makes it possible to optimize the flow velocity of the air supplied from the filter device 1 in accordance with the equipment connected downstream of the filter device 1. In other words, it is possible to further enhance the versatility of the filter device 1.

[0030] Second Embodiment Next, a second embodiment of the present disclosure will be described with reference to FIG. 7. Note that the same reference numerals are used to designate the same components as those in the first embodiment, and detailed description thereof will be omitted. As shown in FIG. 7, the second embodiment differs from the first embodiment in the configuration of the support and fixing part 113. The support and fixing part 113 according to the present embodiment has a framework-like lining member 114 inserted inside the filter body 11. The lining member 114 maintains the shape of the bag-like filter body 11 by inflating it from the inside. In other words, it is desirable to determine the dimensions and shape of the lining member 114 in accordance with the shape required for the filter body 11.

[0031] (Action and effect) According to the above configuration, the lining member 114 can maintain the filter body 11 in a state inflated from the inside, making it possible to sufficiently take in air into the filter body 11 even under low flow rate conditions. Note that the support and fixation part 13 according to the first embodiment is advantageous in that it does not require the insertion and placement of such lining members 114 for a large number of filter bodies 11. On the other hand, the support and fixation part 113 according to this embodiment can stably maintain the shape of the filter body 11 even under extremely low flow rate conditions. In this way, it is desirable to select either embodiment according to the conditions of use.

[0032] The second embodiment of the present disclosure has been described above. It should be noted that various changes and modifications can be made to the above configuration without departing from the spirit and scope of the present disclosure. For example, it is possible to fix only a portion of the filter body 11 with the support and fixation parts 13 described in the first embodiment, and maintain the shape of the remaining filter body 11 with the support and fixation parts 113 described in the second embodiment. In other words, it is possible to combine the configurations of the first and second embodiments.

[0033] <Reference example> Next, a reference example of the present disclosure will be described with reference to FIG. 8. As shown in the figure, a filter device 201 according to this reference example does not include a filter body 11, but instead includes a metal mesh filter 12 or a pleated filter cloth. That is, a double metal mesh filter 12 is arranged, or a metal mesh filter 12 is arranged in the front stage and a pleated filter cloth is arranged in the rear stage. Even with this configuration, stable foreign matter removal performance can be achieved. On the other hand, the configurations according to the above-described embodiments use a bag filter as the filter body 11, which allows foreign matter removal performance to be achieved over almost the entire air flow path, thereby advantageously making the air supplied to the duct 10 even cleaner.

[0034] <Additional Notes> The filter device 1 and the filter replacement method of the filter device 1 described in each embodiment can be understood, for example, as follows.

[0035] (1) The filter device 1 according to the first aspect includes a duct 10 extending in the direction of an axis X, a plurality of bag-shaped filter bodies 11 arranged radially at intervals in the circumferential direction around the axis X and deformable by the flow of air flowing therethrough, a support fixing portion 13 supporting the inner peripheral end of the filter body 11 so as not to move relative to the duct 10, and a housing 14 supporting the outer peripheral end of the filter body 11.

[0036] According to the above configuration, the inner peripheral end of filter body 11 is fixed by support fixing portion 13 so as not to move relative to duct 10. This allows filter body 11 to continue to maintain its shape even when the flow rate of air flowing through filter body 11 is low.

[0037] (2) The filter device 1 according to a second aspect is the filter device 1 of (1), wherein the support fixing portion 13 has a beam member 20 that surrounds the duct 10 from the outer periphery side.

[0038] According to the above configuration, by sequentially fixing the inner peripheral side end of the filter body 11 to the beam members 20, it is possible to easily and inexpensively maintain the shape of the filter body 11.

[0039] (3) The filter device 1 according to the third aspect is the filter device 1 of (1), wherein the support fixing portion 13 is a lining member 114 that is arranged within the filter body 11 and maintains the filter body 11 in an inflated state from the inside.

[0040] According to the above configuration, the lining member 114 can maintain the filter body 11 in an inflated state from the inside, so that air can be sufficiently taken into the filter body 11 even under low flow rate conditions.

[0041] (4) The filter device 1 according to the fourth aspect is a filter device 1 according to any one of the aspects (1) to (3), in which the inner end of the filter body 11 is shifted to one side in the direction of the axis X from the outer end, and is therefore located on the outlet side of the duct 10.

[0042] According to the above configuration, the inner peripheral end and the outer peripheral end of the filter body 11 are offset in the direction of the axis X. This allows a velocity component in the direction of the axis X to be imparted to the flow of air passing through the filter body 11. As a result, it becomes possible to control the air flow velocity in the duct 10.

[0043] (5) The filter device 1 according to the fifth aspect is a filter device 1 according to any one of the aspects (1) to (4), in which the inner peripheral ends of the plurality of filter bodies 11 are circumferentially offset from the outer peripheral ends when viewed from the direction of the axis X.

[0044] According to the above configuration, the inner peripheral end and the outer peripheral end of the filter body 11 are offset in the circumferential direction, so that a circumferential swirling velocity component can be imparted to the air flow passing through the filter body 11. This makes it possible to reduce pressure loss occurring in the air flow inside the duct 10.

[0045] (6) The filter device 1 according to the sixth aspect is a filter device 1 according to any one of the aspects (1) to (5), in which the filter body 11 has a dimension longer than the distance between the housing 14 and the duct 10, and is arranged in a bent state within the housing 14.

[0046] According to the above configuration, even when the filter body 11 is bent, the inner peripheral end is fixed by the support fixing portion 13, which reduces the possibility of the filter body 11 being completely folded or twisted. This allows a standard filter body 11 to be easily applied to the filter device 1.

[0047] (7) A filter replacement method for a filter device 1 according to the seventh aspect is a filter replacement method for a filter device 1 according to any one of the aspects (1) to (6), and includes the steps of sequentially removing the filter body 11 from the housing 14 and the support fixing portion 13, and sequentially fixing a new filter body 11 to the housing 14 and the support fixing portion 13.

[0048] According to the above method, it is possible to more easily and quickly replace the filter body 11. In addition, it is also easy to newly install the filter body 11 on an existing filter device 1 that has a mesh filter or the like other than the filter body 11. [Explanation of symbols]

[0049] 1...Filter device 10...Duct 11...Filter body 12...Metal mesh filter 13...Support fixing part 14. Housing 15...Side 16...Opening 20...Beam member 113...Support fixing part 114... Lining material 201...Filter device X…Axis line

Claims

1. a duct extending in an axial direction; a plurality of bag-shaped filter bodies arranged radially at intervals in the circumferential direction around the axis and deformable by the flow of air flowing therethrough; a support fixing portion that supports an inner peripheral end portion of the filter body so that the inner peripheral end portion of the filter body cannot move relative to the duct; a housing that supports an outer peripheral end of the filter body; A filter device comprising:

2. The filter device according to claim 1 , wherein the support and fixing portion includes a beam member surrounding the duct from an outer periphery.

3. 3. The filter device according to claim 1, wherein the support and fixing portion includes a lining member disposed within the filter body and maintaining the filter body in an inflated state from the inside.

4. The filter device according to claim 1 , wherein the inner peripheral end of the filter body is offset to one side in the axial direction from the outer peripheral end, and is thereby positioned on the outlet side of the duct.

5. The filter device according to claim 1 , wherein the inner peripheral ends of the plurality of filter bodies are offset in the circumferential direction from the outer peripheral ends when viewed in the axial direction.

6. The filter device according to claim 1 , wherein the filter body has a dimension longer than a distance between the housing and the duct, and is disposed in a bent state within the housing.

7. A filter installation and replacement method for the filter device according to claim 1, comprising: removing the filter body from the housing and the support fixture in sequence; a step of sequentially fixing the new filter body to the housing and the support fixing portion; A method for installing and replacing a filter in a filter device.

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