Air filtration system

Abstract

The present disclosure relates to an air filtration device (1) configured to provide intake air to an engine. The device includes a filter chamber (2) including an air inlet opening (3) and an air outlet opening (4), a weather hood (5) disposed on the air inlet side of the filter chamber, the weather hood having a downwardly facing air inlet opening (6) and an outlet opening (7) connected to the air inlet opening (3) of the filter chamber, a pulse filter mechanism (8) including one or more filters (9), and a static filter mechanism (10) positioned at the air outlet opening (4). The pulse filter mechanism (8) is disposed within the weather hood (5). A maintenance space (11) is provided in the filter chamber (2) downstream of the pulse filter mechanism (8), and the filter (9) of the pulse filter mechanism can be replaced via the maintenance space.

Description

Technical Field

[0001] The present disclosure relates to an air filtration device configured to provide intake air to an engine.

Background Art

[0002] Turbo machinery is an important device that takes in a large amount of air. For the performance and lifespan of this device, air quality is extremely important and directly affects the operator's availability, reliability, and profitability. Turbomachinery such as industrial air compressors and gas turbines often operate in harsh environments such as rural, urban, or industrial environments that contain various types of particulate contaminants. The intake air needs to be cleaned before being supplied to the machine; otherwise, impurities in the intake air may damage the engine or reduce the engine's efficiency. Therefore, to prevent or limit the damage that dust and particles in the air taken in by the machine can cause to the machine's components, a filter system including a static filter is usually arranged upstream of the engine's air inlet plenum.

[0003] To extend the lifespan of the static filter by removing the coarsest part of the solid contaminants contained in the air, an upstream pulse filter can be used. Since the filter element of the intake pulse filter tends to clog due to environmental conditions such as fog, rain, snow, and dust, high-frequency cleaning is performed by pulsing compressed air through the filter media in the reverse direction to the intake air direction, thereby maintaining the filtration efficiency and improving the lifespan of the pulse filter. However, both the pulse filter and other filters downstream of the pulse filter will eventually need to be replaced when their lifespan ends. Therefore, all filter units need to be accessible to maintenance staff. US2015 / 114229A1 discloses an example of how to enable access from the maintenance space for replacing the pulse filter.

[0004] Turbomachinery equipment is typically an extremely large installation that takes in large volumes of air, and there is a need to provide effective intake filter systems for these installations. [Overview of the project]

[0005] This disclosure aims to provide an improved air filtration system configured to provide intake air to an engine. The system comprises a filter chamber including an air inlet opening and an air outlet opening; a weather protection hood positioned on the air inlet side of the filter chamber, having a downward-facing intake opening and an outlet opening connected to the air inlet opening of the filter chamber; a pulse filter mechanism including one or more filters; and a static filter mechanism positioned at the air outlet opening. The pulse filter mechanism is located inside the weather protection hood. A maintenance space is provided downstream of the pulse filter mechanism in the filter chamber, through which the filters of the pulse filter mechanism can be replaced.

[0006] The pulse filter of the pulse filter mechanism is positioned appropriately within the weather protection hood so that particles released from the particle-capturing surface of the filter during pulse cleaning mode can freely fall from the filter and exit through the intake opening of the weather protection hood. It is advantageous for the filter of the pulse filter mechanism to be a cartridge filter positioned so that the particle-capturing surface is substantially vertical, i.e., facing downwards.

[0007] The weather protection hood may include a pulse filter mounting structure, which is appropriately configured to divide the internal space of the weather protection hood into an upstream space on the upstream side of the structure and a downstream space on the downstream side of the structure. It is advantageous for the filter to be located in this upstream space. The upstream space is preferably accessible from the maintenance space through one or more hatches or cover plates provided in the wall between the weather protection hood and the maintenance space of the filter chamber.

[0008] A maintenance space is appropriately provided upstream of the static filtering mechanism. The static filtering mechanism may preferably include a plurality of static filters arranged to be accessible from the maintenance space.

[0009] The air filtration system preferably includes a plurality of weather protection hoods connected to the air inlet opening of the filter chamber. Each weather protection hood includes a pulse filter mechanism. The weather protection hoods are arranged appropriately, overlapping each other. The air filtration system may include 2 to 10 weather protection hoods, and the pulse filter mechanisms are connected to the air inlet opening of the filter chamber.

[0010] The air filtration system may further include an engine intake duct connected to the outlet opening of the filter chamber and can be advantageously configured to provide intake air to the gas turbine.

[0011] This disclosure will become apparent from the detailed description given below. The detailed description and specific examples disclose preferred embodiments of this disclosure only as examples. As guided by the detailed description, it will be understood by those skilled in the art that modifications and variations are possible within the scope of this disclosure.

[0012] Accordingly, since the devices and methods described may vary considerably, it will be understood that the disclosures disclosed herein are not limited to any particular component part of such a device or step of such a method. It will also be understood that the terminology used herein is intended solely to describe specific embodiments and is not intended to be limiting. It should be noted that, as used in the specification and the appended claims, the articles “a,” “an,” “the,” and “said” are intended to mean the presence of one or more parts or elements unless explicitly stated otherwise in the context. Thus, for example, “a unit” or “the unit” may include several devices, etc. Furthermore, the words “comprising,” “including,” and “containing,” and similar expressions, do not exclude other elements or steps. [Brief explanation of the drawing]

[0013] The purposes of this disclosure described above, as well as any additional purposes, features, and advantages, will be better understood by referring to the non-limiting detailed description for describing exemplary embodiments of this disclosure set out below, in conjunction with the accompanying drawings.

[0014] [Figure 1] This is a schematic diagram of an air filtration device according to one embodiment of the present disclosure. [Figure 2] Figure 1 is a schematic exploded view of a part of the air filtration system. [Figure 3] This is a schematic perspective view of a weather protection hood, maintenance space, and static filter mechanism according to one embodiment of the present disclosure. [Figure 4] This is a schematic diagram of a suitable type of filter cartridge. [Figure 5] This is a schematic diagram showing another preferred type of filter cartridge, along with the hood and pulse cleaning compressed air device. [Figure 6]This schematic diagram shows yet another preferred type of filter cartridge, along with a hood and a pulse cleaning compressed air device. [Modes for carrying out the invention]

[0015] This disclosure relates to an improved air filtration system configured to provide intake air to an engine. The air filtration system includes a static filter mechanism positioned at its outlet opening within a filter chamber. The static filter mechanism functions to purify the intake air to provide clean air suitable for use in an engine and may be a compact filter (e.g., one with pleated filter media) or an EPA or HEPA filter, as appropriate. The final stage of the HEPA filter provides a barrier to the smallest and most corrosive particles to reduce or eliminate corrosion and fouling.

[0016] The static filter mechanism is appropriately adapted according to the operating conditions in the equipment and can be designed to include approximately 20 to several hundred filters depending on the size of the equipment. If desired, the static filter mechanism can include multiple filter stages. For example, the first static filter stage may include a set of panel or bag filters, and the second static filter stage may include multiple compact filters or EPA or HEPA filters.

[0017] A weather protection hood is positioned on the air inlet side of the filter chamber to prevent rain and snow from entering the filter chamber. The weather protection hood includes an outward-sloping top surface and has a downward-facing intake opening and an air outlet opening connected to the air inlet opening of the filter chamber. The outward-sloping top surface of the weather protection hood allows water, snow, or debris present on the top surface to slide along the surface and fall out of the range of the intake opening.

[0018] Multiple pulse filters are mounted on a filter mounting structure. The filter mounting structure is appropriately configured to divide the internal space of the weather protection hood into an upstream space on the upstream side of the filter mounting structure and a downstream space on the downstream side of the filter mounting structure. It is advantageous for the filters to extend into the upstream space. The hood is configured to close off the downstream space to form a closed hood that adequately protects the inlet opening of the filter chamber. This can be achieved, for example, by providing side walls or covers on each side of the inclined top surface, or by providing a curved inclined top surface that covers the inlet opening of the filter chamber.

[0019] The weather protection hood may also include, as appropriate, side walls positioned around the filter of the pulse filter mechanism on all sides upstream of the hood, preferably on all sides not facing the filter chamber. The side walls are advantageously positioned laterally and extend from the inclined top surface to a point corresponding to the lowest end of the pulse filter or a lower point. The side walls provide weather protection to the filter of the pulse filter mechanism and further reduce the risk of material sliding down the inclined top surface entering the intake air. The weather protection hood may also be equipped with a mesh screen to prevent the entry of undesirable objects and may include a droplet separator to protect against mist and moisture.

[0020] A pulse filter mechanism, including one or more filters, is located inside a weather-protective hood. The pulse filter functions to protect rotating machinery operating in environments with high dust loads. The pulse filter mechanism is equipped with a pulse filter, which is suitable as a single-stage self-cleaning barrier filter. Cleaning is performed during normal operation by injecting compressed air in a reverse flow through multiple filters without disrupting the normal airflow through the pulse filter mechanism, thereby enabling fully continuous operation with a low and stable pressure drop, even in extremely dusty environments. Furthermore, the only time operation may need to be interrupted is when replacing filters, resulting in increased availability, reduced shutdown frequency, and lower maintenance costs. The compressed air injection means is located adjacent to the pulse filter downstream. A static filter protects the engine from particles that may fall from the pulse filter within the maintenance space. Thus, the pulse filter can be replaced even while in operation.

[0021] It is advantageous for the pulse filter mechanism's filter to be located within a weather protection hood, allowing particles released from the particle-capturing surface during pulse cleaning mode to freely fall from the filter and exit through the intake opening of the weather protection hood. This eliminates the need for special installations to collect particles or dust pulsed off the filter. The particles or dust pulsed off the filter can easily slide down the sloping upper surface of the weather protection hood. When several weather protection hoods are stacked on top of each other, side walls positioned around the pulse filter mechanism's filter prevent dust or particles pulsed off from an upper pulse filter mechanism from re-entering the air filtration system through the intake opening of a lower pulse filter mechanism.

[0022] Using a pulse filter mounting structure, the filter of the pulse filter mechanism can be supported. The pulse filter preferably includes a frame or a mounting plate that can be mounted in a sealed manner in the pulse filter mounting structure. The filter of the pulse filter mechanism advantageously includes a filter element that forms a cylindrical and / or conical particle capture surface and a mounting plate or fixture (i.e., a cartridge filter), and is positioned such that the particle capture surface is substantially vertical, i.e., facing downward. Thus, the ejected dust can freely fall outside the weather protection hood and is not captured by another particle capture surface.

[0023] The cross-section of the cylindrical and / or conical filter element can be circular or have any other shape such as an ellipse, rectangle, or any other arbitrary polygon. The filter can include a plurality of panels / panel elements.

[0024] Appropriate pulse filters are described in US2019 / 0247776A1 and US2019 / 0247778A1. This filter type greatly expands the usable surface area of the cartridge, and the internal cone is configured such that the ejected air is uniformly distributed along the outer pack of the filter from top to bottom and even through the internal cone pack. This maximizes the air flow during filter replacement, minimizes the use of compressed air and energy costs, and enables powerful and cost-effective dust collection.

[0025] These filters comprise a filter cartridge and a mounting plate. The filter cartridge includes a cylindrical filter element, inside of which a conical or cylindrical filter insertion part is inserted coaxially with the filter element. Therefore, an inner ring-shaped space is formed in the area between the filter element and the filter insertion part within the filter cartridge. The filter insertion part can be conical with the smaller end facing the cap. The outer diameter of the filter insertion part can increase linearly or non-linearly so that the radially outer surface of the filter insertion part has a curved configuration. Alternatively, the filter insertion part may be cylindrical. The filter materials of the filter element and the filter insertion part are designed to be cleaned when a compressed air flow flows in the opposite direction to the flow direction of the intake air to be filtered.

[0026] The filter cartridge further includes a cap in the form of a flow guiding device. The cap is arranged and designed with respect to its outer shape such that the compressed air flow spreads by the cap, so that all the filter materials of the filter element are covered by the compressed air flow, and the associated energy loss is minimized. Both the filter element and the filter insertion part appropriately have an arcuate cross-section. The cap is fixed to the filter insertion part and has a parabolic cross-section. That is, the cap corresponds to a parabola that rotates about the longitudinal axis of the parabola.

[0027] At the end of the filter cartridge, a filter bottom / annular component is arranged between the filter element and the filter insertion part, connecting the filter element to the filter insertion part. Hereinafter, the direction indicating from above to below in the drawing is referred to as the first axial direction, and the direction opposite to the first axial direction is referred to as the second axial direction. The annular component / filter bottom is formed to be air-impermeable, allowing the dirty air flow outside the filter cartridge to flow from the outside to the inside of the inner space through the filter material of the filter element, or to flow out from the radially arranged inner area within the filter insertion part to the outside through the filter material of the filter insertion part.

[0028] During the filtration operation of the filter cartridge, a dirty airflow flows into the internal space of the filter cartridge. To clean the filter cartridge, the supply of dirty airflow is interrupted, and compressed air is supplied to the filter material of the filter cartridge in the opposite direction to the flow direction during filtration. That is, a compressed airflow in the form of compressed air injection flows in the first axial direction and collides with the filter cartridge. The cap guides the compressed airflow into the annular portion of the internal space, where it flows from the inside to the outside through the filter material of the filter element, and also flows from the outside to the inside into the inner zone through the filter material of the filter insertion section, releasing particles accumulated on the filter material, such as dust. The released particles then fall downward in the direction of gravity.

[0029] The cap can be positioned entirely within the filter cartridge. Alternatively, the cap may be configured such that its tip protrudes axially from the filter element and its base body is positioned inside the filter element. In this way, the compressed air flow is already axially spread closer to the nozzle, and the axial distance between the nozzle and the filter cartridge can be reduced. The tip and base body of the cap can be formed integrally or separately.

[0030] If the cap's tip and base are formed separately, the cap's tip can be connected to the pulse filter mounting structure inside the weather protection hood, and the cap's base can be connected to the filter cartridge. The tip and base do not need to be interconnected; it is sufficient for them to be positioned adjacent to each other. Therefore, the base can take the shape of a parabolic frustum. When replacing the filter cartridge, the cap's tip is held in the pulse filter mounting structure.

[0031] The pulse filters can be arranged in multiple rows within the weather protection hood, each row containing multiple pulse filters, and multiple rows can be arranged side by side within the hood. The pulse filter mounting structure can take the form of a parallel profile positioned to allow the pulse filters of each row to be inserted horizontally into the mounting structure one after another. Gaskets or other sealing means can be positioned on the mounting structure and / or the filter frame or mounting plate. Thus, the combination of the pulse filter mounting structure and the sealed and mounted filter elements divides the inside of the weather protection hood into a dirty upstream side and a clean downstream side.

[0032] Therefore, the internal space of the weather protection hood, including the pulse filter holding frame, is divided into an upstream space on the upstream side of the pulse filter mechanism and a downstream space on the downstream side of the pulse filter mechanism. For this reason, the filter elements are positioned to extend into the upstream (dirty) space.

[0033] A maintenance space or passage for pulse filter replacement is provided on the downstream (clean) side of the pulse filter mechanism within the filter chamber, and is arranged to allow access from the maintenance space to replace the filter of the pulse filter mechanism, which is held within the weather protection hood. This can be achieved by the presence of one or more hatches or cover plates in the wall between the weather protection hood and the maintenance space of the filter chamber. Through these hatches or cover plates, the upstream space of the weather protection hood, and therefore the pulse filter, can be accessed for replacement. When closed, these hatches or cover plates separate the maintenance space on the clean side from the upstream weather protection hood space on the dirty side. This means that the pulse filter is replaced from the downstream side. The filter is replaced horizontally by pulling the filter out of the weather protection hood after opening the hatches or cover plates. A static filter protects the engine from particles that may fall from the pulse filter within the maintenance space during maintenance operations.

[0034] The maintenance space is typically designed to allow maintenance staff easy and safe access to the filter being replaced via stairs and doorways. Enabling pulse filter replacement from a clean, downstream maintenance space eliminates the need for outdoor scaffolding for this purpose within the weather-protected hood, thus reducing costs and improving work safety.

[0035] A maintenance space is provided, where appropriate, upstream of the static filter mechanism, allowing access to the static filter from this maintenance space. This allows the static filter to be replaced from the same maintenance space as the pulse filter, making the air filtration system more compact. Depending on the engine requirements for providing clean air, the static filter mechanism may include multiple filters.

[0036] Depending on the size of the air filtration system and the size of the intake requirements, the air filtration system may preferably include multiple weather protection hoods connected to the air inlet opening of the filter chamber, which may be arranged overlapping and / or side by side as appropriate. Each weather protection hood containing a pulse filter mechanism corresponds to a set of static filters. For example, within one set, 4 to 18 static filters may be arranged side by side, and 3 to 10 static filters may be mounted overlapping. Typically, a pulse filter mechanism may include 4 to 6 static filters that can be mounted overlapping. The width of the weather protection hood and the corresponding set of static filters may be approximately 3 to 12 m, and the height may be approximately 3 to 5 m. The pulse filters may be arranged in multiple rows within the weather protection hood, each row containing, for example, 3 to 8 pulse filters, and 3 to 25 rows may be arranged side by side within the hood. The depth of the weather protection hood is usually adapted to the number of pulse filters contained in one row.

[0037] An air filtration system according to this disclosure may include, for example, 2 to 10 weather protection hoods, each of which includes a pulse filter mechanism connected to an air inlet opening of a filter chamber. Each pulse filter mechanism included in a weather protection hood is accessible from a maintenance space via a hatch or cover, as described above. A platform may be provided within the maintenance space for each weather protection hood.

[0038] The air filtration system may further include an engine intake duct configured to connect to the outlet opening of the filter chamber. The air filtration system can provide clean air to any type of turbomechanical equipment and is particularly advantageous when configured to provide intake air to a gas turbine.

[0039] (Description of exemplary embodiments) The air filtration apparatus of this disclosure will now be described with reference to the accompanying drawings illustrating preferred exemplary embodiments of the disclosure. However, the air filtration apparatus may be embodied in other forms and should not be construed as being limited to the embodiments disclosed herein. The disclosed embodiments are given to fully convey the scope of this disclosure to those skilled in the art.

[0040] Figure 1 is a schematic diagram of an air filtration system according to one embodiment of the present disclosure; Figure 2 is a schematic exploded view of a part of the air filtration system of Figure 1; and Figure 3 is a schematic perspective view of a weather protection hood, maintenance space, and static filter mechanism. Throughout the drawings, the same or corresponding elements or components are referred to by the same reference numerals.

[0041] Figure 1 shows an air filter 1 according to one embodiment of the present disclosure configured to provide intake air to an engine (not shown). In this embodiment, the weather protection hood is provided with side walls, but the side wall closest to the viewer is not shown. Arrows indicate the direction of intake airflow through the air filter. The device comprises a filter chamber 2 including an air inlet opening 3 and an air outlet opening 4. The weather protection hood 5 is located on the air inlet side of the filter chamber (air inlet opening 3) and has a downward-facing intake opening 6 and an outlet opening 7 connected to the air inlet opening 3 of the filter chamber. A pulse filter mechanism 8 including one or more filters 9 is located inside the weather protection hood. A static filter mechanism 10 is located at the air outlet opening 4 of the filter chamber. A maintenance space 11 is provided downstream of the pulse filter mechanism 8 in the filter chamber 2, through which the filters 9 of the pulse filter mechanism can be replaced.

[0042] The pulse filter 9 is located within the weather protection hood 5, allowing particles released from the particle-catching surface 13 of the pulse filter during pulse cleaning mode to freely fall from the filter and exit through the intake opening 6 of the weather protection hood 5. The filter of the pulse filter mechanism 8 can preferably be a cartridge filter positioned such that the particle-catching surface 13 is substantially vertical, i.e., facing downwards.

[0043] As is best seen in Figures 2 and 3, the weather protection hood 5 may include a pulse filter holding structure 18, which is configured to divide the internal space of the weather protection hood 5 into an upstream space 16 on the upstream side of the mounting structure 18 and a downstream space 17 on the downstream side of the mounting structure 18. The pulse filter preferably includes a frame or mounting plate (not shown) that can be sealed and mounted on the pulse filter mounting structure, and the pulse filter mounting structure, together with the mounted filter, divides the interior of the weather protection hood into a dirty upstream side and a clean downstream side. As shown in the drawings, the pulse filter is located in the upstream space 16. The upstream space is accessible from the maintenance space 11 via one or more hatches or cover plates 15 provided in the wall between the weather protection hood and the maintenance space 11 of the filter chamber. Also, Figure 2 shows a pulse cleaning compressed air device 115 with a nozzle 114 positioned above the pulse filter. This device 115 is designed to eject a stream of compressed air from the nozzle to impact the filter material. The arrows in Figure 2 indicate the direction of the compressed air stream.

[0044] As shown in the figure, the maintenance space 11 is located upstream of the static filter mechanism 10. The static filter mechanism may include a plurality of static filters 14 that are arranged to be accessible from the maintenance space for replacement.

[0045] Figure 1 shows how multiple weather protection hoods 5 can be stacked and arranged on top of each other and connected to the air inlet opening 3 of the filter chamber 2. Each weather protection hood includes a pulse filter mechanism 8. In the illustrated example, four weather protection hoods with pulse filter mechanisms 8 are connected to the air inlet opening 3 of the filter chamber.

[0046] Figure 1 shows how the air filtration system includes an engine intake duct 12 connected to the outlet opening 4 of the filter chamber. As described above, the duct 12 can be configured to provide intake air to the gas turbine.

[0047] Figure 4 shows a preferred type of filter cartridge. The filter cartridge 101 includes a cylindrical filter element 102 made of filter material. A filter insertion section 103, also made of filter material, is inserted coaxially with the filter element 102 within the cylindrical filter element 102. Thus, an inner ring-shaped space 104 is formed in the area between the filter element 102 and the filter insertion section 103 within the filter cartridge 101. The filter cartridge 101 includes a cap 106 in the form of a flow guide device 105. As shown in Figure 1, the cap 106 can be completely placed inside the filter cartridge 101. A filter bottom / annular component 107 is positioned at the end of the filter cartridge 101 between the filter element 102 and the filter insertion section 3, thereby connecting the filter element 102 to the filter insertion section 103.

[0048] In Figure 1, the direction pointing from top to bottom is the first axial direction 108, and the direction opposite to the first direction is the second axial direction 109. The annular component / filter bottom 107 is formed to be air impermeable, allowing the contaminated airflow outside the filter cartridge 101 to flow from the outside into the internal space 104 through the filter material of the filter element 102, or to flow out to the outside through the filter material of the filter insertion part 103 from the radially arranged internal area 110 within the filter insertion part 103. In Figure 4, the flow path of the contaminated airflow is indicated by arrows.

[0049] The filter material of the filter element 102 and the filter insertion section 103 is designed to be cleaned when the compressed air flow from the compressed air supply section 113, ejected from the compressed air tube 115 through the nozzle 114, flows in the opposite direction 108 to the direction of the intake air being filtered 109, releasing particles accumulated in the filter material. These particles then fall downward in the direction of gravity.

[0050] In the filter cartridge 101 shown in Figure 4, the filter insertion section 103 is conical, with the smaller end facing the cap.

[0051] As shown in Figure 5, the cap 106 can be configured such that its tip 116 protrudes axially from the filter element 102 and its base body 117 is positioned inside the filter element 102. The tip 116 and base body 117 of the cap 106 can be formed integrally with each other or separately. Figure 5 also shows the compressed air tube 115 and nozzle 114. Compressed air flows through these in the opposite direction to the intake air flow direction during pulse cleaning of the filter.

[0052] If the tip portion 116 and base body 117 of the cap 106 are formed separately, as shown in Figure 6, the tip portion 116 of the cap 106 can be connected to the pulse filter mounting structure 18 inside the weather protection hood, and the base body 117 of the cap 106 can be connected to the filter cartridge 101. When replacing the filter cartridge 101 from the downstream side of the pulse filter mechanism, the tip portion 116 of the cap 106 is held by the pulse filter mounting structure 118.

[0053] Figure 6 shows how to install a suitable type of filter cartridge with the cap 106 held in place by the mounting structure 18.

[0054] It will be apparent to those skilled in the art that this disclosure is not limited to the embodiments described above. Furthermore, it will be apparent to those skilled in the art that modifications and variations are possible within the scope of the appended claims, and that, by examining the drawings, this disclosure, and the appended claims, variations to the disclosed embodiments will be understood and implemented in carrying out the claimed disclosure.

Claims

1. An air filter (1) configured to provide intake air to an engine, A filter chamber (2) including an air inlet opening (3) and an air outlet opening (4), A weather protection hood (5) positioned on the side of the air inlet of the filter chamber, having a downward-facing intake opening (6) and an outlet opening (7) connected to the air inlet opening (3) of the filter chamber, A pulse filter mechanism (8) including one or more filters (9), A static filter mechanism (10) positioned at the air outlet opening (4), In an air filtration device equipped with, An air filtration device characterized in that the pulse filter mechanism (8) is located inside the weather protection hood (5), a maintenance space (11) is provided downstream of the pulse filter mechanism (8) in the filter chamber (2), and the filter (9) of the pulse filter mechanism can be replaced via the maintenance space.

2. The filter of the pulse filter mechanism (8) has a particle trapping surface (13), The air filtration device according to claim 1, wherein the pulse filter is located within the weather protection hood so that particles released from the particle-capturing surface during pulse cleaning mode can freely fall from the filter element and exit through the intake opening (6) of the weather protection hood (5).

3. The air filtration device according to claim 1 or 2, wherein the filter of the pulse filter mechanism (8) each includes a filter element that forms a cylindrical and / or conical particle-capturing surface and a mounting plate or fixture, and is positioned such that the particle-capturing surface (13) is vertical, i.e., downward.

4. The weather protection hood (5) includes a pulse filter mounting structure (18), The pulse filter mounting structure is configured to divide the internal space of the weather protection hood (5) into an upstream space (16) on the upstream side of the mounting structure (18) and a downstream space (17) on the downstream side of the mounting structure (18). The pulse filter is arranged in the upstream space (16), The air filtration apparatus according to any one of claims 1 to 3, wherein the upstream space is accessible from the maintenance space (11) via one or more hatches or cover plates (15) provided in the wall between the weather protection hood and the maintenance space (11) of the filter chamber.

5. The maintenance space (11) is provided upstream of the static filter mechanism, The air filtration apparatus according to any one of claims 1 to 4, wherein the static filter mechanism includes a plurality of static filters (14) arranged to be accessible from the maintenance space.

6. Multiple weather protection hoods are connected to the air inlet opening (3) of the filter chamber. The air filtration apparatus according to any one of claims 1 to 5, wherein each of the weather protection hoods includes a pulse filter mechanism (8).

7. The air filtration device according to claim 6, wherein the weather protection hoods are arranged in overlapping positions.

8. The air filtration apparatus according to claim 6 or 7, comprising 2 to 10 weather protection hoods having a pulse filter mechanism (8) connected to the air inlet opening (3) of the filter chamber.

9. The air filtration device according to any one of claims 1 to 8, further comprising an engine intake duct (12) connected to the outlet opening (4) of the filter chamber.

10. An air filtration device according to any one of claims 1 to 9, configured to provide intake air to a gas turbine.

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