JP4203449B2 - Filter clogging detection method - Google Patents

Description

The present invention relates to a filter clogging detection outgoing method, in particular, to filter clogging detection attitude method that enables the filter can be efficiently replaced.

Conventionally, for example, a gas turbine is used as a power generation device. The gas turbine sucks outside air through a filter, and then sends the sucked outside air (supply air) to a compressor through a duct for compression, and the compressed air and fuel are mixed and burned in a combustor. As a result, the turbine is driven by the energy of the generated combustion gas to output rotational energy. As a filter for a gas turbine, for example, as shown in Patent Document 1, a three-stage filter is connected in series to a flow path from an upstream side (outside air side) to a downstream side (gas turbine side), and is included in the atmosphere. What captures minute dust and improves the operation efficiency of a gas turbine is used. When these filters are continuously used, a large amount of dust adheres to them and clogs them. As a result, the amount of air supplied to the compressor decreases, and the power generation efficiency decreases. For this reason, conventionally, the power generator is stopped and the filter is periodically replaced.
Japanese Patent Laid-Open No. 2003-254088

However, if the filter is periodically replaced in this way, the power generation device may be stopped even when the filter performance is sufficient, or the power generation device may be operated even when the filter performance is insufficient. The filter cannot be replaced. Therefore, a method of exchanging the filter by detecting the differential pressure between the upstream side and the downstream side of the filter and grasping the clogging state of the filter by this differential pressure can be considered.
However, since it is necessary to supply a large amount of air to the gas turbine, a filter having a large area is required as a filter facing the outside air. On the other hand, the area of the duct supplying air to the gas turbine is considerably smaller than the area of this filter. For this reason, the flow rate of air passing through each part of the filter is large at a portion near the duct, and is small at a portion away from the duct. Thus, since the flow rate varies depending on the position of the filter, the ease of clogging also varies depending on the position of the filter. Therefore, the filter replacement time cannot be properly grasped only by detecting the differential pressure at one location of the filter.
An object of the present invention is to provide a filter clogging detection device that enables efficient filter replacement.

According to the present invention, the differential pressure between the upstream air pressure and the downstream air pressure of the filter for removing dust contained in the gas turbine supply air is at least two points in a plane parallel to the filter surface of the filter. A filter management method for managing the filter by using a filter clogging detection device including a differential pressure detection means for detecting the filter, wherein the differential pressure detection means is a portion where clogging in the filter is likely to occur. When the differential pressure is detected, and the differential pressure on one side of the detected filter is equal to or less than a preset specified value, the filter is determined to be normal, and the detected differential pressure on one side of the filter is the specified pressure. If the difference is greater than the value, the differential pressure detecting means detects the differential pressure on the other side that is less likely to be clogged than the one side in the filter, and the differential pressure on the other side of the detected filter is detected. The filter is determined to be normal when the value is less than or equal to a predetermined value set in advance, and the filter is determined to be abnormal when the differential pressure on the other side of the detected filter is greater than the specified value. It is characterized by.

According to the filter clogging detection attitude method of the present invention, there is an effect that the filter can be efficiently replaced.

Hereinafter, a combined cycle power generation apparatus 100 including a gas turbine filter unit 1 according to an embodiment of the present invention will be described.
FIG. 1 is a diagram schematically illustrating the overall configuration of the combined cycle power generation apparatus 100. As shown in FIG. 1, the combined cycle power generation apparatus 100 includes an air supply facility 10 that introduces outside air, and compresses and mixes the introduced air with fuel, burns the mixed gas, and rotates the turbine to rotate energy. Output from the gas turbine 12, steam generated from the exhaust gas from the gas turbine 12, the turbine rotated by this steam to output rotational energy, and the gas turbine 12 and the steam turbine 14 output And a generator 16 that generates electric power with rotational energy.

  FIG. 2 is a diagram illustrating an external side view of the air supply facility 10. As shown in FIG. 2, the air supply facility 10 includes, for example, a four-story box-shaped facility body 17 that introduces outside air as indicated by an arrow X, and the front surface of the outer wall on each floor of the facility body 17 (left surface in the figure). 17A and the gas turbine filter unit 1 that is attached to the openings of the both side surfaces 17B and removes dust from the introduced outside air, and projects from the rear surface 17C (right surface in the drawing) of the equipment body 17 to the lower rear, A duct 18 that guides the air that has passed through the filter unit 1 to the gas turbine 12 (FIG. 1) side as indicated by an arrow Y is provided.

  The equipment body 17 is hollow inside so that the air introduced through the gas turbine filter unit 1 flows to the duct 18. In addition, the flow velocity (flow rate) and the flow direction of the outside air flowing in the equipment main body 17 change according to the openings and the number of stages of each filter of the gas turbine filter unit 1 attached to the equipment main body 17. For this reason, in the present embodiment, for example, even when a three-stage filter is used for the equipment body 17 that has conventionally used a one-stage filter, for example, a flow rate (flow rate) of outside air that is at least as high as before can be secured. The equipment body 17 is expanded upward and forward. Thereby, the flow of the outside air in the equipment body 17 is made smooth.

The gas turbine filter unit 1 is formed in, for example, a substantially rectangular panel shape when viewed from the front, and a plurality of gas turbine filter units 1 are arranged adjacent to each other vertically and horizontally via a weather louver 19 that prevents rainwater from entering.
FIG. 3 is an exploded perspective view showing the gas turbine filter unit 1. FIG. 4 is a plan view showing an attachment member constituting the gas turbine filter unit 1. As shown in FIG. 3, the gas turbine filter unit 1 includes, for example, a filter 20 configured in three stages, a mounting member 50 that holds the three-stage filters 20 in a separated state, and a clogged state of the filter 20. And a detection device 80 for detecting.

  The filter 20 includes a first stage filter 31, a second stage filter 32, and a third stage filter 40. The first stage filter 31, the second stage filter 32, and the third stage filter 40 are arranged in this order from the upstream side (outside air side). The first stage filter 31 and the second stage filter 32 correspond to the upstream filter in the claims, and the third stage filter 40 corresponds to the downstream filter in the claims.

  The first stage filter 31 is a filter that is formed in a rectangular plate shape and collects dust of 1 μm or more by 90% or more in terms of the number of particles. The second stage filter 32 is a filter that is formed in a rectangular plate shape and collects dust of 1 μm or more by 99% or more in terms of the number of particles. A frame member 35 is attached to the outer periphery of the second stage filter 32. The third-stage filter 40 is a filter that collects 99% or more of particles having a particle size of 0.3 μm or more. By combining the three-stage filters 31, 32, and 40, the filter 20 can collect 99.9% or more of particles having a particle size of 0.3 μm or less from the introduced outside air.

  An attachment frame 33 is disposed between the first stage filter 31 and the second stage filter 32. The attachment frame 33 is configured as a rectangular frame having a predetermined thickness dimension. The downstream side surface 33 </ b> A of the attachment frame 33 is fitted into a frame member 35 attached to the outer periphery of the second stage filter 32. In addition, frame members 33C are provided on the upper and lower side surfaces 33B of the mounting frame 33, and the upper and lower frame members 33C and the first stage filter 31 are engaged with each other. With such a configuration, the first stage filter 31 and the second stage filter 32 are separated by the thickness dimension of the mounting frame 33. In addition, in some of the mounting frames 33, for example, an insertion hole 33P through which the pipe P is inserted is formed in the upper part or the like. The air pressure between the first stage filter 31 and the second stage filter 32 can be measured through the pipe P passed through the insertion hole 33P. Although the insertion hole 33P is formed in the upper part, it may be formed in the lower part or the side part.

  Further, the gas turbine filter unit 1 includes a gripping member 34 that grips the first stage filter 31, the second stage filter 32, and the mounting frame 33 in the thickness direction to form a unit. The gripping members 34 are attached to the left and right sides of the first stage filter 31 and the second stage filter 32, respectively. Each holding member 34 is in contact with the upstream surface of the first-stage filter 31 and is configured to be extendable and contracted, and is provided at both ends of the contact section 34A. Engaging portion 34 </ b> B that engages with 35.

  The first stage filter 31 and the second stage filter 32 are assembled by the following procedure. First, the attachment frame 33 is fitted to the frame member 35 on the outer periphery of the second stage filter 32, and the attachment frame 33 and the first stage filter 31 are engaged. After that, the engaging member 34B is engaged with the upper and lower sides of the frame member 35 while the extended contact portion 34A is applied to the upstream surface of the first-stage filter 31, so The filter 31, the second stage filter 32, and the mounting frame 33 are gripped in the thickness direction. As described above, since the first stage filter 31 is simply held by the second stage filter 32 with the holding member 34, the first stage filter 31 having the highest replacement frequency can be easily replaced without using a tool or the like.

  As shown in FIGS. 3 and 4, the attachment member 50 includes a lattice-like frame body 52 attached to the wall surface of the equipment body 17, and apex portions of the lattices on the upstream surface and the downstream surface of the frame body 52. An angle member 54 that is welded perpendicularly to A and supports the first-stage filter 31, the second-stage filter 32, and the third-stage filter 40, and penetrates in the front-rear direction of the frame 52 as shown in FIG. In addition, a presser member 56 that presses the left and right end edges of each filter 31, 32, 40 toward the frame body 52 is provided.

  As shown in FIG. 3, the frame body 52 is configured in a lattice shape in which the plurality of filters 20 can be arranged in a state adjacent to each other in the vertical and horizontal directions. Each lattice includes an upper frame 52A, a lower frame 52B, and left and right vertical frames 52C. Filters 31 and 32 supported by angle members 54 are screwed to the upstream surface of the frame 52 by screws 58. A third-stage filter 40 supported by the angle member 54 is disposed on the downstream surface of the frame body 52. In addition, in some of the frame bodies 52, through holes 52Q through which the pipes Q are passed are formed in the upper frame 52A in the same manner as the insertion holes 33P. The air pressure between the second stage filter 32 and the third stage filter 40 can be measured through the pipe Q passed through the insertion hole 52Q. Although the insertion hole 52Q is formed in the upper frame 52A, it may be formed in the lower frame 52B or the left and right vertical frames 52C.

  As shown in FIG. 4, the holding member 56 includes an upstream surface and a downstream surface of each vertical frame 52 </ b> C of the frame body 52, and further, a frame member 35 (FIG. 3) attached to the second stage filter 32. A bolt member 60 of a certain length that penetrates, a pressing member 62 that is attached to the downstream end of the bolt member 60 and presses the third-stage filter 40 (FIG. 3) to the frame body 52 side, and the bolt member 60. And a wing nut 64 that is screwed to the upstream end of the second stage and fixes the second stage filter 32 (FIG. 3) to the frame body 52 side.

The pressing member 62 includes a pressing member main body 66 that is inserted through the bolt member 60, and a nut 68 that is screwed to the downstream end of the bolt member 60 and fixes the pressing member main body 66. The third stage filter 40 is pressed against the frame 52 side.
The pressing member main body 66 attached to the end edge of the frame body 52 supports only one third stage filter 40, and extends from the end of the pipe part 70 and the pipe part 70 for passing through the bolt member 60. The pressing plate 72 is not inclined with respect to the bolt member 60 by passing the pipe portion 70 through the bolt member 60. The pressing member main body 66 attached to a place other than the edge of the frame body 52 is configured as a pressing plate 72 that supports the adjacent third-stage filters 40 together.

The above gas turbine filter unit 1 is assembled as follows.
First, the filters 31 and 32 are assembled in the procedure as described above. Next, the first stage filter 31 and the second stage filter 32 are screwed to the upstream surface of the frame body 52 while the first stage filter 31 and the second stage filter 32 are supported by the angle member 54. Further, the third stage filter 40 is supported by an angle member 54 attached to the downstream side of the frame body 52. Next, the bolt member 60 is passed through the frame member 35 on the outer periphery of the frame body 52 and the second stage filter 32, and a wing nut 64 is screwed to the upstream end of the bolt member 60, so that the first stage filter 31 and The second stage filter 32 is fixed to the upstream surface of the frame body 52. Further, after passing the pressing member main body 66 through the downstream end portion of the bolt member 60, a nut 68 is screwed into the downstream end portion of the bolt member 60, so that the third stage filter 40 is located downstream of the frame body 52. Secure to the surface. The pipe Q is passed through the insertion holes 52Q of some of the frames 52, and the pipe P is also passed through the insertion holes 33P of some of the mounting frames 33.

Next, a method for efficiently maintaining and managing the filters 31, 32, and 40 using the detection device 80 will be described.
FIG. 5 is a diagram schematically illustrating the configuration of the detection device 80. As shown in FIG. 5, the detection device 80 includes a pipe P (FIG. 3) that is a first pipe connected between the first stage filter 31 and the second stage filter 32, and the second stage filter 32 and the third stage filter 32. A pipe Q (FIG. 3) which is a second pipe connected between the stage filters 40, a pipe R connected in the air supply facility 10 on the upstream side of the first stage filter 31, and a third stage filter 40 And a pipe S connected to the downstream side. The pipe P has pipes P1 and P2 branched in two on the way from the base end to the tip, and the pipe Q also has pipes Q1 and Q2 branched in two on the way from the base end to the tip. Yes. Valves 88 (88A, 88B, 88C, 88D) for opening and closing each flow path are provided in the flow paths of the pipes P1, P2, Q1, and Q2, respectively.

  FIG. 6 is a front view showing the air supply facility 10. The distal ends of the pipes P1 and Q1 are connected to the filter 20 disposed at the lower floor position D shown in FIG. Moreover, the front ends of the pipes P2 and Q2 are connected to the filter 20 disposed at the upper floor position U shown in FIG. The lower floor position D corresponds to one side of the claimed filter, and the upper floor position U corresponds to the other side of the claimed filter.

  As shown in FIG. 5, the detection device 80 includes a first differential pressure gauge 81 that connects the base ends of the pipes R and P, a second differential pressure gauge 82 that connects the base ends of the pipes P and Q, and each pipe. A third differential pressure gauge 83 that connects the base ends of Q and S and a fourth differential pressure gauge 84 that connects the base ends of the pipes R and S are provided. The first differential pressure gauge 81 detects the differential pressure between the outside air upstream of the first stage filter 31 and the air between the first stage filter 31 and the second stage filter 32. The second differential pressure gauge 82 detects the differential pressure between the air between the first stage filter 31 and the second stage filter 32 and the air between the second stage filter 32 and the third stage filter 40. The third differential pressure gauge 83 detects the differential pressure between the air between the second stage filter 32 and the third stage filter 40 and the air for supplying the gas turbine 12 downstream from the third stage filter 40. The fourth differential pressure gauge 84 detects the differential pressure between the outside air upstream of the first stage filter 31 and the air for supplying the gas turbine 12 downstream of the third stage filter 40, that is, the total differential pressure.

In the present embodiment, since the duct 18 to the gas turbine 12 is attached to the lower side, the flow rate of the air passing through the lower floor side filter 20 is higher than the upper floor side filter 20, and therefore It is considered that the floor-side filter 20 is clogged first. Therefore, the detection device 80 grasps the clogging status of the filters 31, 32, 40, that is, the replacement time of the filters 31, 32, 40 as follows.
Under normal conditions, the valves 88A and 88C of the pipes P1 and Q1 connected to the lower floor side of the air supply facility 10 are opened, and the valves 88B and 88D of the pipes P2 and Q2 connected to the upper floor side of the air supply facility 10 are opened. Is closed to detect the pressure difference between the filters 31, 32, and 40 provided on the lower floor side to grasp the clogging situation. When it is determined that the filters 31, 32, 40 provided on the lower floor side are clogged, the valves 88A, 88C of the pipes P1, Q1 connected to the lower floor side of the air supply facility 10 are used. Is closed and the valves 88B and 88D of the pipes P2 and Q2 connected to the upper floor side of the air supply facility 10 are opened to detect the differential pressure of the filters 31, 32 and 40 provided on the upper floor side. Grasp the clogging situation.

  That is, when the valves 88A and 88C are opened and the valves 88B and 88D are closed, when the detected values by the differential pressure gauges 81 to 84 are equal to or less than a predetermined value set in advance for each differential pressure gauge, the filter 31 on the lower floor is used. , 32, and 40 are determined to be in a state where clogging is small and can be used effectively. On the other hand, when the detection value by each differential pressure gauge 81-84 becomes larger than the predetermined value preset for every differential pressure gauge, it is determined that the lower floor filters 31, 32, 40 are clogged, and the lower floor By closing the valves 88A, 88C of the pipes P1, Q1 on the side and opening the valves 88B, 88D of the pipes P2, Q2 on the upper floor side, the filters 31, 32, 40 provided on the upper floor side of the air supply facility 10 Switch to monitoring.

  When the valves 88A and 88C are closed and the valves 88B and 88D are opened as described above, if the detected values by the differential pressure gauges 81 to 84 are equal to or less than a predetermined value set for each differential pressure gauge in advance, the upper floor filter 31, 32, and 40 are determined to be in a state where clogging is small and can be used effectively. In this case, since filters 31, 32, and 40 that can be used effectively exist in some parts, it is determined that the filters 31, 32, and 40 as a whole can be used effectively. On the other hand, when the detection value by each differential pressure gauge 81-84 becomes larger than the predetermined value preset for every differential pressure gauge, the filter 31, 32, 40 whole is clogged, and it is in the state which cannot be used effectively. judge. This timing is the replacement time of each filter 31, 32, 40. As described above, the maintenance of the filters 31, 32, and 40 is performed by detecting the differential pressure at each location. In addition, although the differential pressure is detected at two places on the upper floor side and the lower floor side of the air supply facility 10 in this way, it may be three or more places. Moreover, as a detection location, it is not limited to the upper floor side and the lower floor side of the air supply equipment 10, It can select suitably according to the attachment position of the duct 18, etc.

According to this embodiment, there are the following effects.
(1) Since the filters 31, 32 and 40 tend to accumulate dust from the lower floor position D, the differential pressure gauges 81 to 84 detect the differential pressure at the lower floor position D of the filters 31, 32 and 40. Thus, the clogging state of the lower floor position D of each filter 31, 32, 40 is grasped, and the differential pressure at the upper floor position U is detected only when the lower floor position D is clogged, and each filter When the upper floor position U of 31, 32, 40 is clogged, it is determined that the entire filter 31, 32, 40 is in the replacement period, and the upper floor position of each filter 31, 32, 40 is determined. When U is not clogged, it is determined that the entire filter 31, 32, 40 is in a state where it can be used normally. Therefore, the replacement time of each filter 31, 32, 40 can be accurately grasped, Each filter 31, 32, 40 can be replaced efficiently

  (2) Since the filters 31 and 32 are attached to the upstream side of the frame body 52 and the third-stage filter 40 is attached to the downstream side of the frame body 52, the plurality of filters 31, 32, and 40 are held by one frame body 52. Therefore, it is possible to reduce the size of the gas turbine filter unit 1.

  (3) Although the clogging frequencies of the filters 31, 32, and 40 are different due to the difference in the openings of the filters 31, 32, and 40, in the present embodiment, the filters 31 and 32 are installed on the upstream side of the frame body 52. Since the third-stage filter 40 is provided on the downstream side of the frame body 52, the upstream-side filters 31 and 32 having a high replacement frequency are independently provided without affecting the third-stage filter 40 having a low replacement frequency. The filter 20 can be replaced, and the maintenance work of the filter 20 is facilitated.

  (4) Since the angle members 54 are provided on the upstream side and the downstream side of the frame body 52 and the filters 31, 32 and the third stage filter 40 are supported by the angle members 54, the filters 31, 32, and the third stage The filter 40 can be easily positioned.

  (5) Since the mounting frame 33 is arranged between the first stage filter 31 and the second stage filter 32 and these are held in the thickness direction by the holding member 34, the filters 31 and 32 are handled as one unit. Thus, the replacement and maintenance of the filters 31 and 32 are easy.

  (6) Since the filters 31, 32, and 40 are fixed to the frame body 52 using the bolt members 60 having a certain length, the filters 31 and 32 on the upstream side of the frame body 52 or the downstream side By just aligning any one of the three-stage filters 40, the other filters 31, 32, 40 can be easily aligned.

  (7) In order from the upstream side, a first-stage filter 31 that collects 90% or more of dust of 1 μm or more in terms of the number of particles; a second-stage filter 32 that collects 99% or more of dust of 1 μm or more in number of particles; Since the filter 20 is configured by arranging the third stage filter 40 that collects 99% or more of dust of 0.3 μm or more in terms of the number of particles, the dust of 0.3 μm or less from the introduced outside air is 99.9 in terms of the number of particles. % Or more can be collected. For this reason, since it becomes difficult for dust to adhere to the blades of the air compressor constituting the gas turbine 12, the air compressor can be operated efficiently without impairing the air flow, and as a result, the power generation efficiency can be improved. In addition, the performance of the filters 31, 32, and 40 to be configured is not limited to the above, and the filters 31, 32, and 40 may be arranged so as to have higher performance sequentially from the upstream side.

  (8) Since the ends of the pipes P, Q are branched into two, and the pipes P, Q are shared for the detection of the upper floor position U and the lower floor position D of each filter 31, 32, 40, Compared to the case where pipes and differential pressure gauges are provided corresponding to the respective positions U and D, the number of pipes P and Q and the number of differential pressure gauges can be reduced, thereby reducing pipe construction errors such as pipe connection errors. At the same time, the material cost of piping, the cost for the differential pressure gauge, the construction cost, the management cost, and the like can be suppressed, and the installation space for the detection device 80 including the piping and the differential pressure gauge can also be reduced.

  In addition, this invention is not limited to the said embodiment. For example, in the above-described embodiment, the detection locations are two locations, the upper floor position U and the lower floor position D, but the number of detection locations is not limited, and may be three or more. It is not limited to the floor position U and the lower floor position D. Moreover, although the upper floor position U and the lower floor position D were detected by one differential pressure gauge using the pipe | tube which the front end side branched into two, you may arrange | position one differential pressure gauge for every position.

  In the above embodiment, the operator monitors the differential pressure gauges 81 to 84 to open and close the valve 88 to grasp the replacement time of the filter 20. However, the replacement time of the filter 20 using a computer is known. May be automatically grasped. For example, a configuration may be adopted in which the opening and closing of each valve 88 is electromagnetically controlled based on whether or not the detected value by each of the differential pressure gauges 81 to 83 is greater than a predetermined specified value.

In the above embodiment, the upstream filter is constituted by two stages of the first stage filter 31 and the second stage filter 32. However, the upstream filter may be one stage or three stages or more, and the number of stages is particularly large. It is not limited. Further, although the downstream filter is configured with the third-stage filter 40 as one stage, it may have a plurality of stages.
Further, as a pressing member for fixing the filters 31 and 32 on the upstream surface of the frame body 52 and the third stage filter 40 on the downstream surface of the frame body 52, the end portion of the bolt member 60 penetrating the frame body 52. Although the structure which attaches the wing nut 64 and the pressing member 62 to this was employ | adopted, it is not limited to this structure, You may use another fastening means.

It is a figure showing typically the whole composition of a gas turbine generator provided with a filter unit concerning one embodiment of the present invention. It is a cross-sectional view which shows the air supply equipment which comprises the said gas turbine generator. It is a disassembled perspective view which shows the said filter unit. It is a top view which shows the attachment member which comprises the said filter unit. It is a figure which shows typically the detection apparatus which comprises the said filter unit. It is a front view which shows the said air supply equipment.

Explanation of symbols

1 Gas Turbine Filter Unit 10 Air Supply Equipment 12 Gas Turbine 14 Steam Turbine 16 Generator 17 Equipment Main Body 17A Front 17B Both Sides 17C Rear 18 Duct 19 Weather Louver 20 Filter 31 First Stage Filter 32 Second Stage Filter 33 Mounting Frame 33A Downstream side surface 33B Upstream side surface 33C Frame member 33P Insertion hole 34 Holding member 34A Abutting portion 34B Engagement portion 35 Frame member 40 Third stage filter 50 Mounting member 52 Frame body 52A Upper frame 52B Lower frame 52C Vertical frame 52Q Insertion hole 54 Angle Material 56 Pressing member 60 Bolt member 62 Pressing member 64 Wing nut 66 Pressing member main body 68 Nut 70 Pipe portion 72 Pressing plate 80 Detector 81 First differential pressure gauge 82 Second differential pressure gauge 83 Third differential pressure gauge 84 Fourth differential pressure gauge 88 ( 88A, 88B, 88 C, 88D) Valve 100 Combined cycle power generator A A vertex D Lower floor position P, P1, P2, Q, Q1, Q2, R, S Piping U Upper floor position

Claims (1)

A differential pressure detecting a differential pressure between an upstream air pressure and a downstream air pressure of a filter for removing dust contained in the gas turbine supply air at at least two points in a plane parallel to the filter surface of the filter. A filter management method for managing the filter using a filter clogging detection device including a detection means,
When the differential pressure detecting means detects a differential pressure on one side, which is a place where clogging in the filter is likely to occur, and the detected differential pressure on one side of the filter is equal to or less than a preset specified value. Determines that the filter is normal,
If the detected differential pressure on one side of the filter is greater than the specified value, the differential pressure detecting means detects the differential pressure on the other side that is less likely to be clogged than the one side of the filter, When the detected differential pressure on the other side of the filter is less than or equal to a preset specified value, the filter is determined to be normal, and the detected differential pressure on the other side of the filter is greater than the specified value A filter management method, wherein the filter is determined to be abnormal.

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