RU2675917C2 - Filtration system and method of cleaning incoming air of gas turbine - Google Patents

Abstract

FIELD: filtration.SUBSTANCE: invention relates to filtration. Filtration system, in particular, for cleaning the incoming air of a gas turbine contains a flow channel, surrounded by walls, with an inlet and outlet, a dividing wall that is located between the inlet and the outlet and is bounded by the wall of the flow channel and at least two filters for cleaning the fluid flowing through the flow channel. At least one first filter forms one assembly unit and is mounted on a partition wall, and at least one second filter also forms one assembly unit and is mounted on a partition wall. Second filter is located behind the first filter. First and second filters at least partially overlap in one direction, mainly in the direction perpendicular to the separation wall. Method for cleaning the incoming air of a gas turbine by means of a filtration system and a set of filters are also described.EFFECT: technical result: increased reliability.8 cl, 39 dwg

Description

FIELD OF TECHNOLOGY

The invention relates mainly to filtration, and in particular to an improved device and method for cleaning incoming air to be used in a gas turbine.

BACKGROUND

Typically, a gas turbine requires large amounts of incoming air to burn fuel. The result of natural air pollution is a significant degradation of turbine performance. For example, particles from the air settle on the blades of a compressor of a gas turbine and lead to an imbalance or effect of a change in the flow profile of the blades of the compressor. Salt crystals or aerosols of salts contained in air cause the cat to corrode in a gas turbine, in particular on turbine blades. These and other mechanisms lead to a sharp decrease in performance and energy efficiency. For this reason, the intake air is filtered to remove as many contaminants as possible. This is usually done using a large number of filters that are located in the filter compartment. The filter compartment is connected to the gas turbine via a flow channel through which clean air is supplied to the gas turbine.

The filters are attached to at least one filtration wall, which forms, inside the filter compartment, a partition of the region of relatively untreated gas and the region of relatively pure gas, defined in relation to the corresponding filtration wall. The filter wall can also be called a matrix. The filtration wall is hermetically connected to the walls of the filter compartment and limited by their height and width. The filter wall has openings through which air exchange can occur between the sides of the crude gas and pure gas. Filters are installed in front of or in these openings.

Filters can have different designs. For example, in all different embodiments, filter cartridges, pocket filters, and cartridge filters are used. It is also non-trivial to arrange several filter walls one after another in series connection, due to which the class of filters and filter separation efficiency are usually chosen in such a way that this parameter increases from the first filter wall to the last. Thus, the filtration wall located on the inlet side functions as a stage of preliminary air filtration for subsequent stages of filtration.

All modern filtration systems are generally such that individual filters are installed on only one side of the separation wall. This is usually the side of the corresponding raw gas or the dirty side of the filter walls. In the general case, it is also considered as an advantage the possibility of dismantling the loaded filters in the idle gas turbine from the side of the raw gas, so that any contaminants released from the filters cannot penetrate into the clean gas region. At the same time, the filters of the latter — in the direction of flow — of the filtration stage are always mounted on the clean gas side of the filtration wall.

Gas turbines are also used on offshore oil and gas platforms. They are used to generate electric current for the purpose of operating the platform or pumping and compressing, respectively, produced oil and gas. Due to the limited space and weight limitations of the platform structures, the filter compartments are built smaller and more compact than usual compared to ground installations. Due to the smaller size of the filter compartments, the dimensions of the filter walls also become smaller, and in the typical case, significantly fewer filters are installed than is usually the case with the same turbine model on land. Conversely, this means that the filters are operated with a volumetric flow rate of air to be filtered that is significantly higher than on land, since the total volumetric flow rate is determined by the gas turbine. Accordingly, offshore gas turbines typically have a volumetric flow rate of from about 7000 to more than 8000 m ³ / h per filter, while onshore gas turbines typically have a volumetric flow rate of from about 3400 to 4300 m ³ / h.

With respect to land-based gas turbines, it should be noted that in recent years there has been a trend towards higher quality filtration. In particular, the use of EPA filters or HEPA filters that comply with the EN 1822: 2009 standard has proven to be beneficial since the energy efficiency effect of a gas turbine over its service life is very positive. At the same time, increasing the efficiency of filtration through the filter material, in the general case, also increases the pressure drop across it. Thus, the pressure drop across the new filter, among other things, depends on the filter material and the volumetric flow rate used. Since the maximum pressure drop across the filter compartment or the gas turbine itself is limited, the result of a given number of filters is to limit the class of filters. Due to the high volumetric flow rate of gas turbines on offshore platforms, filters are used almost exclusively in accordance with EN 779: 2012 or equivalent. Higher quality filters complying with EN 1822: 2009 or equivalent have not yet become dominant, although a positive effect on the turbine's efficiency would be desirable. In the case of ground-based gas turbines, the volumetric flow rate of the filter can be reduced by enlarging the filter compartment and the resulting increase in the number of filters. However, in the case of offshore installations this is not possible in most situations. The space occupied by the installation, in particular when it comes to existing platforms, is simply limited. For example, the height of each deck on the offshore platform is fixed, and the filter compartment cannot extend across multiple decks. Numerous processes are associated with tightly packed pipelines and conduits that occupy most of the space between decks. Consequently, increasing the space of the filter compartment would require, by and large, to undertake a complete modernization and reorganization - if at all possible - of these many processes. Another issue is the filter life. It also depends on the volumetric flow rate in connection with the total area of the expanded filter material of a particular grade inside the filter compartment. A longer service life is desirable because it extends the intervals after which it is necessary to replace the filters, and thereby increase the turbine's availability for operation. In the early phase of the filter life, the pressure drop of the filter changes slightly in response to rapidly changing operating conditions, and by the end of the life of the filter, a relatively small change, such as humidity, will result in a large and rapid increase in pressure drop across the filter, which can cause an alarm or limiting the stroke of the turbine, leading to an unexpected shutdown of the entire system. Therefore, it is advisable to change the filters before they are in an unstable state, and to avoid unexpected shutdowns. A longer filter life not only reduces the relationship between unstable and steady states, but also allows you to replace filters before they enter the instability phase. Thus, the filtration system will give increased technological reliability by increasing the area of the expanded filter material. To this end, the invention allows to increase the number of filters in parallel order on the dividing wall inside the flow channel without the need to increase the size or cross section of the flow channel or dividing wall.

SUMMARY OF THE INVENTION

The invention relates to a filtration system, in particular for cleaning the incoming air of a gas turbine containing:

a flow channel surrounded by walls, with an inlet and an outlet, a dividing wall that is located between the inlet and the outlet and is limited to the walls of the flow channel by at least two filters for cleaning the fluid that flows through the flow channel, in which at least one first filter forming one assembly unit is mounted on a dividing wall, and at least one second filter, which also forms one assembly unit, is mounted on a partition the wall,

characterized in that

a second filter is located between the first filter and the first and second filter, which overlap at least partially in one direction, mainly perpendicular to the dividing wall. The purpose of the flow channel is to direct a fluid stream, in particular a gas or air stream including tiny particles, such as dust, powder or salt spray, from the inlet to the outlet. It has walls that separate the flow of fluid from the environment outside the flow channel, usually ambient air, and prevent mixing with the latter. The fluid to be cleaned enters the flow channel through the inlet under pressure and leaves the channel through the outlet. The outlet of the flow channel is usually connected to a consumer, in particular a gas turbine, into which a fluid stream is supplied. Inside the flow channel, the separation wall is located mainly across the fluid flow and is completely hermetically connected to the walls of the flow channel, thereby providing a separation plane inside the flow channel extending transversely to the fluid flow direction. Due to this arrangement, the fluid flow is guided through the openings in the separation wall and the filters attached to it, respectively. Therefore, the fluid stream is cleaned. Thus, the separation wall is a bulkhead between the relatively dirty side and the relatively clean side of the flow channel, since the filters reduce the amount of particles contained in the fluid stream.

According to a preferred embodiment, filters of the first grade or type are attached to said dividing wall, each of which is a single mounting block, which is mainly on the dirty side of the flow channel.

In addition, filters of the second grade or type are fastened in said dividing wall, each of which again is a single mounting block, located mainly on the clean side of the flow channel.

The invention is based on the realization that, as a result of installing filters on one single side of the filter wall, these filters can be placed side by side. Thus, the outer dimensions of the filters, in particular their width and height, determine the maximum number of filters that can be installed on the filter wall having a certain width and height. This limitation is eliminated by the solution of the invention. In the case of the first filter, the filters can be installed on the dirty or inlet side, and in the case of the second filter, on the clean or exhaust side of the flow channel. Alternatively, in the case of the first filter, the filters can be installed on the dirty or inlet side, and in the case of the second filter also on the dirty or inlet side of the flow channel. During such an alternative mounting process, the second filter simply has to be moved from the dirty or inlet side of the flow channel through the second hole to the clean or exhaust side of the flow channel. Through this solution, for mounting the second filter, it is not necessary to have access to the clean or exhaust side of the flow channel or to carry out this step on it. The filters preferably have a frame with which they are attached to the dividing wall. The filter frame is fluid tight and imparts mechanical stability to the filter. In addition, it holds the filter media in place. A fluid stream is supplied to and from the filter material through openings in the frame. Part of the filter frame preferably completely surrounds the hole in the separation wall. Each filter is preferably hermetically attached to the partition wall. According to the invention, a second filter is located between the first filter and the first and second filters preferably overlap at least partially in one direction, mainly perpendicular to the partition wall.

Therefore, both filters together require less space on the dividing wall. Thus, the space between the holes in the separation wall is smaller. As a result, the number of holes in the partition wall can preferably be increased, and as a result, more filters can be installed. Therefore, with a constant total volumetric flow rate of the fluid, the volumetric flow rate of the filter decreases. The result of a lower volumetric flow to the filter is a longer filter life and lower pressure drop. The area on which the frames of the first and second filters overlap in one direction, mainly perpendicular to the dividing wall, is preferably at least 2% of the total calculated filtration area in the plane of the partition formed by the dividing wall. Even more preferably, the area on which the frames of the first and second filters overlap is at least 5%, 10%, 15%, and most preferably 20% of the total calculated filtration area in the plane of the partition. The filters are preferably arranged in at least one row. Even more preferably, the filters are arranged in several parallel rows. Filters of at least one row are preferably fixed alternately on the dirty side and on the clean side, or, respectively, filters of at least one row alternately extend mainly on the dirty side and the clean side. The filter elements are preferably located in several parallel first rows and passing at an angle to the second rows. Filters of the first parallel rows, as well as of the second rows passing obliquely to them, are preferably mounted alternately from the dirty side and from the clean side, or, respectively, the filters of the first parallel rows, as well as of the second rows passing obliquely to them, extend mainly mainly on dirty side and clean side. The second rows extending obliquely are preferably arranged perpendicular to the first rows. The filters preferably have a substantially circular, oval, rectangular, square or polygonal cross section.

Filters preferably comprise a folded or embossed filter media. The filters preferably have one of the filter classes G, M or F according to EN 779: 2009 or one of the EPA1, HEPA2 or ULPA3 filter classes according to EN 1822: 2012. At the same time, the EPA Filter is an “effective air purification filter”, the HEPA Filter is a high-efficiency air purification filter, and the ULPA Filter is a “air purification filter with an ultra-low particle leakage”. The fluid is preferably gas, air or liquid. The outlet is connected to a fluid consumer, which is preferably a compressor, gas turbine, pump or building, automobile or industrial ventilation system. The filter media in the filters preferably have an asymmetric flow direction. The filter media preferably include at least one membrane layer. More preferably, the filter materials have a multilayer structure.

In addition, the invention is a method, in particular, for cleaning the inlet air of a gas turbine by means of a flow channel surrounded by walls, having an inlet and an outlet, a dividing wall that is located between the inlet and the outlet and is limited by the walls of the flow channel, and, at least two filters for cleaning a flowing fluid, characterized in that at least one filter is mounted or mounted on a partition wall and at least one additional The filling filter is mounted on the dividing wall, the second filter being placed between the first filter, and the first and second filters are at least partially overlapping in one direction, mainly vertically with respect to the dividing wall.

The invention also relates to a filter holder for attaching at least two filters or filter elements, each of which is a single mounting block, to a filter assembly, in particular a turbine. The filter assembly allows fluid to flow through the at least two filters from the dirty side to the clean side. According to the invention, the design of the filter holder allows the installation of at least one filter or filter element on the dirty side and at least one filter or filter element on the clean side.

The filter holder according to the invention is preferably made in the form of one or more vertical or horizontal support posts. More preferably, the associated support legs are located in a plane and, together with the filters, form a filter wall. The filter holder is preferably made with several support legs, two of which support the filter at its opposite edges, respectively. The filter holder preferably holds several filters on the dirty side and on the clean side, respectively, so that these filters are arranged in a row. The filter preferably has a frame to be attached to the filter holder and containing a bag of filter material inserted therein. The filter, in particular the frame, is preferably connected planarly to the filter holder in sections. The filter preferably protrudes above the filter holder on the dirty side and on the clean side. The filter preferably has a filter element that is V-shaped in cross section.

The invention also relates to the use of a filter holder for attaching at least one first filter to the dirty side and at least one second filter to the clean side of the filter wall, in particular a gas turbine.

In addition, the invention preferably relates to a method for attaching at least one first filter and at least one second filter to a filter wall, in particular a gas turbine, whereby said at least one first filter is mounted on a clean side of the filtration wall, and said at least one second filter is mounted on the dirty side of the filtration wall.

In addition, the invention is devoted to a set of filters with at least one first filter element adapted for installation on the separation wall of the filtration system and at least one second filter element adapted for installation on the separation wall of the filtration system. The second filter element covers the first filter element and the first and second filter elements at least partially overlap, mainly in the direction vertical with respect to the dividing wall. The second filter element is preferably made with a filter frame, the corresponding filter material of which is installed opposite to the first filter element element when viewed in the direction of fluid flow flowing through the separation wall. The invention solves the problem of increasing the number of filter elements, in particular made in a parallel arrangement on the filter wall in the filter compartment or the flow channel, so as to increase the filter class or filter life without the need to increase the size or cross-section of the filter compartment or flow channel and filter wall , respectively.

The filter elements, the filter material of which is enclosed in the filter frame, usually have an area of the filter frame by which it is attached to the dividing wall. This area is called a flanged area or poke. In the filter compartment, the separation wall separates the relatively dirty side and the relatively clean side. In general, the flange portion of the filter is attached to the separation wall in such a way that it is impervious to the medium to be filtered, and therefore, the medium to be filtered can only enter or exit through the remaining openings in the filter frame. The flange portion of the filter element surrounds the holes in the filter frame, generally hermetically attached to the filter wall, and usually surrounds one hole of the filter wall. Accordingly, the dirty side and the clean side are separated, in particular, by the seals of the filter frame on the partition wall.

The size of the flange section of the filter is determined by various factors. On the one hand, for reasons of stability, a certain minimal surface of the flange section is required, which is connected to the filtration wall. On the other hand, the seal attached to the filter frame or filter wall occupies a space and must also be within the flange section.

It is well known that compact cartridge filters pass through an opening in the filter wall. In this case, the outer dimensions of the filter should be larger than the dimensions of the holes in the filter wall to prevent the filter from falling onto the other side of the filter wall. Thus, the flange portion of the filter element establishes a fixed connection with the filter wall.

The filter media is usually connected to the filter frame or tucked into it in the area of the flange section or directly next to it. In this area, the filter frame is impervious to the medium to be filtered. In particular, in the case of folded (folded) filter materials, this area depends on the depth of the fold. In the case of filter elements, which are usually used for gas turbines or air compressor compressors, the fold depth is usually in the range from 4 mm to 100 mm, in the case of compact cartridge filters and filter candles it is usually in the range from 20 mm to 50 mm, and in the case of filter elements with two packages of folded materials, which are given a V-shape, the crease depth is usually in the range from 50 mm to 100 mm. Therefore, along with the flange section, the edge region of the filter element, which is impermeable to the medium to be filtered, can be more than 100 mm, and the inlet or outlet openings for the medium to be filtered can be located more than 100 mm from the edge of the filter, respectively .

If two adjacent filter elements are located in the filter wall so that one filter element is attached to the dirty side (raw gas side) and the adjacent filter element is attached to the clean side (clean gas side), the areas of the corresponding frames of the first and second filter elements are fixed by in such a way that they are impermeable to the medium to be filtered, can be arranged in the same direction one after another so that they partially overlap, and this happens mainly perpendicular to iltration wall. Due to this arrangement, these filters need less space on the filter wall, and the distance between the corresponding holes of the filter wall decreases accordingly. At the same time, the inlet and outlet openings of the filter elements are ideally not covered. With a constant volume flow, this configuration has approximately the same pressure drop across the filter wall as when the filter elements were arranged on one side.

The filter elements are generally arranged in rows on the filter wall. Ideally, adjacent filter elements are alternately located on the dirty side (raw gas side) and the clean side (clean gas side). Depending on the size of the corresponding filter wall and the size of the respective filters, a number of filters may contain more filter elements with this two-sided arrangement than with a one-sided arrangement of the same filter elements. Thus, the filtration wall as a whole may contain more filter elements and, at a certain total volumetric flow rate, the latter is correspondingly distributed over a larger number of filter elements than in the case of a conventional one-sided installation of filter elements.

A lower volumetric flow rate on the filter element is beneficial for many reasons. On the one hand, the service life of the filtering elements increases, since the number of filtered particles per unit time decreases proportionally. On the other hand, the pressure drop across the entire filter wall of the filtration stage (filter wall and filter elements) is reduced, since it depends on the volumetric flow rate to the filter element. A lower pressure drop, in turn, has several advantages. For example, you can install filter elements with a higher separation efficiency or a higher filtration class, which usually also create a much greater pressure drop across the filter wall of the filtration stage (filter wall and filter elements) due to the higher flow resistance. For example, gas turbines, which are used on offshore platforms for oil and gas extraction, are mainly equipped with pocket filters, the filtration class of which is in accordance with EN 779: 2009 and which are operated at very high volumetric flows in the range from about 7000 m ³ / hour to more 8000 m ³ / hour. With such high volumetric flow rates for the filter element, higher quality filtration using EPA, HEPA or ULPA filters in accordance with EN 1822: 2012 is not practical. The maximum pressure drop limit would either be reached after a very short load time, or would be too high for new filters or the filter compartment (cross section of the flow channel), and the filter wall would have to be given significantly larger dimensions to reduce the volumetric flow rate to the filter element. However, this is not possible due to limited space and the maximum allowable load capacity of the platforms.

Another advantage of a lower pressure drop at the filtration stage (filter wall and filter elements) is that the energy efficiency of the gas turbine is higher compared to the filtration stage where the pressure drop is higher.

The lower initial pressure drop of the newly installed filters also means that the filters can be operated longer before the pressure drop reaches the maximum allowable pressure drop due to particle loading. Thus, the pressure drop range is higher compared to the filtration stage (filter wall and filter elements) with a higher initial pressure drop. In addition to this, filters can be replaced before they reach their unstable phase, in which the pressure drop of the filter is very sensitive to changing operating conditions. Thus, the number of unexpected outages decreases, and the reliability of the entire system increases. The two-dimensional arrangement of filter elements on the filter wall is often embodied in parallel rows. In most cases, the filters are located in the second rows, which are usually perpendicular to the first rows. These perpendicular rows are also parallel to the bottom of a friend. However, it is also possible the arrangement of the second rows at a certain angle to the first rows. Thus, the filter elements form a matrix on the filter wall. As already described above, it is advantageous to arrange adjacent filter elements in a row alternately on both sides of the filter wall.

There are two options for a two-dimensional arrangement of filter elements on the filter wall. These two options are similar in that the filter elements in the front rows (parallel to each other) are alternately arranged on the dirty side (raw gas side) and the clean side (clean gas side) of the filter wall. In the first embodiment, the filters in the second rows, which pass obliquely to the first rows, are attached to only one side of the filter wall. This has the advantage that this arrangement is compatible with most conventional filter elements and that a rather high degree of overlap between the individual filter elements has already been achieved. In particular, rectangular cartridge filters or V-shaped filter elements have the main part of their edge region at the sealed frame only on two opposite sides of the flange portion of the frame. This is due to the fact that the folded (folded) filter bags in this area are hermetically connected to the filter frame along the entire depth of the fold. In the direction at an angle of 90 degrees to it, the area of the packages of folded (folded) filter material to be sealed is relatively small.

In the second embodiment of a two-dimensional arrangement of filter elements on the filter wall, each filter adjacent to the first filter is attached to the side of the filter wall opposite to the first filter. This has the advantage that maximum overlap of the flange portions of the first filter is possible. In some cases, the filtration efficiency inherent in filter media depends on the direction. In other words, the filtration efficiency, determined by such parameters as the filtration class or the service life, depends on the direction in which the fluid flows through the filter material. The reason for this may be a gradient structure or a multilayer structure of the filter material, in which the individual layers have different features. In particular, such a multilayer structure often has filter materials with a microporous membrane (EP 1674144).

If the filter elements are located on the dirty side (raw gas side), as well as on the clean side (clean gas side) of the filter wall according to the invention, the flow direction, in particular with respect to the filter frames, which are identical in other respects, depends on which side of the filter wall they are installed. When filtering materials are used depending on the direction, and in particular multilayer filtering materials, the filtering element must therefore be set so that the flow direction determined by the location of the filtering element on the filtering wall is identical to the flow direction of the filtering material.

Example: The type of filter that is typically used to filter the incoming air of gas turbines is the so-called “ASC4 filter”. It can have a simple V-shaped design or also a two-component form. This filter is attached to the filter wall and sealed. The usual arrangement involves the installation of filter elements on the side of the raw gas of the filter wall. The number of filter elements is determined by the width of the filter frames and the size of the filter wall. The width of the outlet of this type of filter is approximately 40% of the total width of the filter. Thus, the overlap of the flange portion with respect to the adjacent filter reaches about 30% of the total width of the filter element. In this particular case, the two-sided arrangement according to the invention enables the installation of at least eight filter elements on that filter wall where initially only six filter elements could be mounted side-by-side in a row without restricting the inlet or outlet of the filter elements.

The object of the invention is also a means of reducing the overall mesh volumetric geometry and the associated weight of the system, while satisfying the existing technological specification or exceeding its requirements. Consequently, in the framework of an in-depth study of technology, important future useful results are achieved for industrial markets. In geometrical volume, the compartment of the traditional filtration system, in which the filter elements are enclosed, is the largest single unit, supplied as a component for a gas turbine. In fact, for all air purification systems and among all sectors (turbine equipment, pollution control devices, heating, ventilation and air conditioning (HVAC), diesel engines, compressor), a significant problem arises due to the physical size and geometry, as well as the delivery of equipment to the destination and due to the final integration of the structure into the installation. On ships, such as floating liquefied natural gas plants (floating LNG plants), LNG tankers, high-speed ferries and passenger cruise liners, gas turbines and diesel engines are used to generate traction when the engine drives the propeller shaft. Thus, the space of the engine room depends on the dimensions of the complete turbine unit and, accordingly, the filter compartment on the suction side. Therefore, the invention provides a smaller size of the filter compartment, and the resulting smaller use of the cavity of the engine room can lead to additional passenger capacity at the same size or increase the carrying capacity of the LNG tanker or cargo vessel. For smaller vessels, such as high-speed catamaran ferries (typically 71.63 m (325 ft) long), the smaller and lighter box-shaped filtration system will provide designers the flexibility to integrate the system into this highly compact structure without compromising air quality. Due to the global nature of the respective markets, a typical situation is that international transport of filter compartments from the point of manufacture to the destination is required. It is well known that this will have to deal with repeated intercontinental transport. Since the system is transported as finished products in almost all cases, a large amount of equipment makes it necessary to incur significant transportation costs and related failures. Therefore, the invention provides significant market margins for many thousands of transported systems annually.

In some cases, it may be desirable to take advantage of the invention while maintaining the original layout of the filter compartment and changing its partition. This could be the case when the consumer must first verify the advantages of the invention, while maintaining the ability to return to the original layout with the original filter elements. For those cases, it is proposed to install intermediate plates to cover existing baffle openings. The intermediate plates preferably have dimensions similar to the filter frame, which is mounted on the partition. They can even have similar flange areas, and even have a gasket attached to them - just like the original filter element. In that case, you can use the original devices for fastening the intermediate plate to the partition and guarantee an airtight seal between them. Although the intermediate plates are a solution that makes it possible to remove them, it is also possible to install them by fixedly fastening them to the partition, for example, by welding, soldering or gluing. Again, the intermediate plates themselves have holes that allow the adjacent filter elements to be mounted alternately from the clean side and from the dirty side. Adjacent filter elements are preferably mounted on the intermediate plate so that the filter frames overlap in a direction perpendicular to the intermediate plate. The closed areas of the filter frames are preferably made as overlapping as possible. Compared to the initial layout, this minimizes the open areas through which air can pass through the partition immediately after installing the filters, and in addition, it allows to increase the total filtration area.

In environments with high humidity or a high content of water droplets in the air, such as in coastal or tropical regions, filter media accumulate a large amount of water. Especially hydrophobic or even waterproof filter media accumulate water on the upstream side. If the filter element is mounted on a vertical filtration wall (partition), then the water flow is opposite to the direction of air flow. To facilitate the flow of water, a slight slope of the filter element relative to the horizontal plane of the filter compartment is desired (WO 2012038317). In cases where the filter elements are mounted directly on the filter wall, it may be desirable to tilt the filter wall or its parts so that the angle of inclination relative to the horizontal plane is less than 90 degrees, preferably less than 85 degrees. In cases where intermediate plates are used to mount the filters on the filter wall (wall), these intermediate plates can be shaped so that the mounting surface for the filter elements and the mounting surface for the filter wall form an angle of more than 0 degrees, preferably more than 5 degrees. The intermediate plates may consist of several parts, but preferably they are made as one part to avoid additional flange sections. As an additional alternative, the filter elements themselves can be shaped so that water will drain from them by gravity.

The filtration wall (partition) and, in particular, the intermediate plates can have different shapes. In the most common situation, they have a planar shape. But in some cases, a curved mounting surface for filter elements may be desirable. A small change in the angles of the individual filter elements can lead to an overall decrease in the pressure drop of the system, especially in a situation where the gaps between the filter elements are not the same. In addition, the load characteristic of unequally spaced filter elements will increase. The layout of the individual filter elements, providing for their inclination at a certain angle, will lead to a harmonized flow distribution between the filter elements and therefore will lead to a uniform load on all filter elements. This will result in a longer overall life of the filter set in this configuration. Accordingly, the invention also relates to a filtration system, which is intended, in particular, for cleaning the inlet air of a gas turbine and comprises: a flow channel with an inlet and an outlet, a partition with at least one opening between the dirty side and the clean side, located between the inlet and the outlet and bounded by the walls of the flow channel, at least one intermediate plate with at least two holes that covers the fume opening ki, and at least two filter elements for cleaning a fluid passing through a flow channel, characterized in that at least one first filter element is mounted in the first hole of the intermediate plate on the dirty side and at least one the second filter element is mounted in the second hole of the intermediate plate on the clean side.

According to the invention, the first and second filter elements are preferably partially overlapped in a direction substantially perpendicular to the intermediate plate. More preferably, the overlap of the frames of the first and second filter elements in a direction substantially perpendicular to the intermediate plate is at least 5% of the total calculated filtration area in the plane of the intermediate plate or partition.

In addition, the invention relates to a method for cleaning the inlet air of a gas turbine, which consists in the following: using a flow channel with an inlet and an outlet, a partition with at least one opening between the dirty side and the clean side located between the inlet and an outlet and bounded by the walls of the flow channel, at least one intermediate plate with at least two holes that covers the hole of the partition, and at least two filtering e ementa for cleaning fluid passing through the flow channel; mount at least one first filter element in the first hole of the intermediate plate on the dirty side, and at least one second filter element in the second hole of the intermediate plate on the clean side.

The invention also provides a set of filters with at least one first filter element, which is a single mounting unit and adapted for installation in the first hole on the dirty side of the intermediate plate of the filtration system, and at least one second filter element, representing a single mounting block and adapted for mounting in a second hole on the clean side of the intermediate plate of the filtration system. The invention also provides a set of filters with an intermediate plate, at least one first filter element installed in the first hole on the dirty side of the intermediate plate, and at least one second filter element installed in the second hole on the clean side of the intermediate plate, whereby the filter materials of the first and second filter elements are in a parallel configuration with respect to the fluids.

For safety reasons, it is preferable to exclude service doors on the clean side of the filter compartment and install all filters only on the dirty air side. This reduces the risk that foreign objects remain on the clean side and are sucked into the turbine, which could cause substantial damage.

In an even more preferred embodiment of the present invention, the filter wall includes preferably horizontal support beams that make up the filter holder. The first set of filter elements is mounted on these support beams so that the filter elements protrude into the clean side of the filter compartment. The filter elements are mounted in rows so that every second row between two mounting beams remains vacant or open. These first filter elements are preferably positioned relative to the supporting beams with positioning studs that protrude perpendicularly from the supporting beams to the dirty side. The second set of filter elements is mounted on the supporting beams in the vacant rows between the first filter elements in such a way that the filter frames of both filter sets are partially overlapped. The second set of filters protrudes towards the dirty air of the filter compartment. With this arrangement, the filter elements of the first set and the second set are alternated and mounted in close proximity.

The filter elements are attached with a seal to the mounting beams of the filter wall, as well as directly to each other. A compressible gasket in the form of a strip including a sealing lip is preferably used to form such a seal. The gasket is preferably part of the filter frame of each filter element. The strip gasket is advantageously located at the flange portion of the filter frame, preferably surrounding the male opening of the filter. In a preferred embodiment, the gasket of the first filter protrudes or protrudes outward from the filter frame in such a way that it overlaps with the gasket of the second filter and with the filter wall.

Parts of the frame are preferably made of a polymeric material through an injection molding process. More preferably, the gasket is also molded or attached to the filter frame by this injection molding process (multi-component injection molding process) or by a second injection molding process. Preferably, a two-component injection molding process is used, such that the frame and gasket are molded together in a single step. This will provide much more stringent tolerances compared to the process in which the gasket is positioned on the filter frame in the second stage.

Below, with reference to the accompanying drawings and the schematic views shown therein, a more detailed description of possible embodiments of the solution corresponding to the invention is given.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1: a top view of a known type A cartridge filter.

FIG. 2: front view II corresponding to FIG. one.

FIG. 3: rear view III corresponding to FIG. one.

FIG. 4: Front view of a known Type B cartridge filter.

FIG. 5: a cross-sectional top view of a known V-shaped filter.

FIG. 6: rear view VI corresponding to FIG. 5.

FIG. 7: front view VII corresponding to FIG. 5.

FIG. 8: a cross-sectional top view of a filter compartment including a filter wall in a first embodiment according to the prior art.

FIG. 9: top view according to FIG. 8 with installed cartridge filters corresponding to FIG. four.

FIG. 10: top view according to FIG. 8 with installed cartridge filters corresponding to FIG. 1-3.

FIG. 11: a top view in cross section of a filter compartment including a filter wall in a second embodiment according to the prior art.

FIG. 12: top view according to FIG. 11 with installed filters corresponding to FIG. 5.

FIG. 13 is a top sectional view of a filter compartment including a filter wall according to a first embodiment of the invention.

FIG. 14: top view according to FIG. 13 with cartridge filters installed in accordance with FIG. four.

FIG. 15: a top view according to FIG. 13 with cartridge filters installed in accordance with FIG. 1-3.

FIG. 16 is a top sectional view of a filter compartment including a filter wall according to a second embodiment of the invention.

FIG. 17: a top view according to FIG. 16 with cartridge filters installed in accordance with FIG. 5-7.

FIG. 18: front view in cross section of the filter compartment with a view of the filter wall, corresponding to a variant according to the prior art and used for the invention.

FIG. 19: a front view according to a first embodiment of an intermediate plate according to the invention.

FIG. 20: front view according to FIG. 18 with intermediate plates installed in accordance with FIG. 19.

FIG. 21: front view of the intermediate plate corresponding to FIG. 19, with installed V-shaped filter elements corresponding to FIG. 5-7.

FIG. 22: side view XXII corresponding to FIG. 21.

FIG. 23: a side view according to a second embodiment of an intermediate plate according to the invention.

FIG. 24: side view according to FIG. 23 with installed V-shaped filter elements corresponding to FIG. 5-7.

FIG. 25 is a plan view of a third embodiment of an intermediate plate in accordance with the invention.

FIG. 26: a top view according to FIG. 25 with installed V-shaped filter elements corresponding to FIG. 5-7.

FIG. 27: is a top sectional view of a type C V-shaped filter element according to the invention.

FIG. 28: front view XXIIX of the filter element corresponding to FIG. 27.

FIG. 29: rear view XXIX of the filter element corresponding to FIG. 27.

FIG. 30: a cross-sectional top view of a type D V-shaped filter element according to the invention.

FIG. 31: a front view XXXI of the filter element corresponding to FIG. thirty.

FIG. 32: rear view XXXII of the filter element of FIG. 32.

FIG. 33: a front cross-sectional view of the filter compartment with a view of the filter wall according to the fourth embodiment of the invention.

FIG. 34: front view according to FIG. 33 with filter elements corresponding to FIG. 27-29 mounted on the filter wall.

FIG. 35: front view according to FIG. 34 with filter elements corresponding to FIG. 30-32 mounted on the filter wall.

FIG. 36: front view according to FIG. 35 with side rails mounted on the filter wall.

FIG. 37: a top sectional view of the filter compartment corresponding to FIG. 35.

FIG. 38: an enlarged sectional view of the sealing assembly of the filter element in the filter wall shown in FIG. 34.

FIG. 39: an enlarged view according to FIG. 38 of the filter elements of both types in the filter wall shown in FIG. 35.

DETAILED DESCRIPTION OF THE INVENTION

In FIG. 1-7, various filters 100 are shown which are typically used to filter air or gases. Filters 100 are constructed as separate mounting blocks to be mounted on the respective filter assemblies, and can also be called simply a “cartridge filter” or “filter element”. Incidentally, filters 100 are used to filter the incoming air of gas turbines or compressor air, as well as to filter air in buildings or industrial gases. Each filter 100 includes a filter frame 118, which covers the filter material 128. A flat, plenary, rectangular and frame-like flange portion 130 is provided in the filter frame 118, on which the filter frame 118 can be attached to the filter wall 108 (see FIG. 8-10). A seal 120 is located at the flange portion 130 so that it seals the filter frame 118 relative to the filter wall 108 and surrounds the flange portion 130.

In FIG. 1-4 show two designs of so-called cartridge filters, whereby in FIG. 1 through 3 show a cartridge filter 102 of type A, and in FIG. 4 shows a Type B cartridge filter. A Type A cartridge filter 102 is characterized in that a flange portion 130 with a seal 120 is typically located in the middle of the cartridge filter 102. This is clearly shown in FIG. 1. In other words, the flange portion 130 is part of the filter frame 118 and serves the purpose of attaching the cartridge filter 102 completely tight to the filter wall 108. The filter frame 118 is preferably impermeable to the medium to be filtered.

The medium to be filtered enters the filter material 128 in the cartridge filter 102 on the dirty side 122 through the inlets 126 in the filter frame 118 and is therefore cleaned. In FIG. 2 and 10 it is shown in more detail. The filtered medium then flows from the cartridge filter 102 on the rear side of the filter 102 through the outlet openings 127 to the clean side 124. This is shown in FIG. 3. The filter material 128 is folded or folded and has the shape of rectangular in cross section material packages 132 that are arranged V-shaped and hermetically connected to the filter frame 118 at their edges. The open side of two packages 132 of materials, which are both arranged on the clean side 124 in the form of a letter V, leads to the inlets 126 in the frame 118 of the filter. The inlets 126 and the outlets 127 have a certain distance from the edge 129 of the filter, which is clearly shown in FIG. 2-3. Thus, they are surrounded by a closed edge region 134, which is, by the way, a flange portion 130 of the filter frame 118. Type B cartridge filters 104 differ from Type A cartridge filters 102 only in that the flange portion 130 in the longitudinal direction is located mainly at one end, in this case, at the front end of the filter element 104. In FIG. 4 shows a front view of such a filter element 104, in which eight packages 132 of materials are arranged in pairs in the shape of the letter V, so that the front view (FIG. 4) shows four inlets 12 6 in the filter frame 118. In FIG. 4 also shows that the inlets 126 have a certain distance from the edge 129 of the filter of the filter element 104 and that as a result there is a closed edge region 134 that surrounds all holes 126. The mounting situation of these type B filter elements 104 is shown in FIG. 9.

In FIG. 5-7 show various views of the filter element 106. In FIG. 5 shows a top view in section, in FIG. 6 is a rear view, and in FIG. 7 is a front view. The filter element 106 includes a flange portion 130, which is part of the filter frame 118 and serves the purpose of attaching the filter element 106 to the filter wall 108 (see FIGS. 11 and 12). The filter frame 118 is preferably impervious to the medium to be filtered and has several purposes. It imparts mechanical stability to the filter element 106 and holds the packages 132 of materials in position. The medium to be filtered enters the filter material in the filter element 106 through its inlets 126 in the filter frame 118 and is therefore cleaned. The filtered medium then flows out of the filter element 106 through the outlet openings 127. This is shown in FIG. 6. The filter material 128 is folded or folded and again takes the form of two packages 132 of materials that are arranged in the shape of the letter V and are tightly connected to the filter frame 118 at their edges. The open side of the two bags 132 of material leads to a single rectangular inlet 126 at the flange portion 130 of the filter frame 118. The open side of the two packages 132 of materials leads to a single rectangular inlet 12 6 on the flange portion 130 of the filter frame 118. The inlets 126 again have a certain distance from the edge 12 9 of the filter, which is clearly shown in FIG. 6. Thus, they are surrounded by an area 134 of the closed edge of the filter frame 118 and a seal 120 integrated therein.

In each of FIG. 8-17 show a top sectional view of the filter compartment 110 bounded by the walls 142. The filter compartment 110 provides a flow channel that has an inlet 14 6 and an outlet 148 for the medium to be filtered and flowing through the flow channel along the flow direction 140. The outlet 148 is typically connected to a consumer of clean fluid. The filter wall 108 is located transverse to the transverse direction 140 of the flow of the medium to be filtered, or is transverse to it, and is limited by the walls 142 of the filter compartment 110. The filter wall 108 is shown from above in cross section. It has a dirty side or a side of a raw gas, indicated by 122 and facing a region of a crude gas or dirty area, indicated by 112, a filter compartment 110, and a clean gas side or a clean side, indicated by 124 and facing a clean gas or clean area , indicated at 114, the filter compartment 110. The filter wall 108 has openings 116 through which the medium to be filtered flows from the dirty side 122 to the clean side 124. The walls 142 of the filter tdeleniya 110 may gain access doors 144. In each of FIGS. 9, 10 and 12 show a filter compartment 110 where various filter elements 100 are mounted on a single side of the filter wall 108 in accordance with the prior art, in this case, on the dirty side 122 of the filter wall 108. The maximum number of filter elements mounted horizontally, is determined by the width of the filter elements 100. In FIG. 9 shows seven filter elements 104 of type B; in FIG. 10 - seven filter elements 102 of type A, and in FIG. 12 to sixteen filter elements 106. In each of FIG. Figures 8 and 11 show a filter compartment 110 for installing, respectively, filter elements 102 and 104 or 106 in accordance with the prior art, and filter elements 102 and 104 and 106 themselves are not shown.

In each of FIG. 14, 15 and 17 show a filter compartment 110, where various filter elements 100 are alternately arranged on both sides of the filter wall 108 of the invention. This arrangement is based on the knowledge that the maximum number of filter elements mounted horizontally is determined not only by the width of the filters 100, but also by the size of the region 134 of the closed edge of the respective filters 100, as shown in FIG. 1-7. As a result, the number of filters 100 that can be mounted on a filter wall 108 of a constant size corresponding to the invention increases. In FIG. 14 shows eight filter elements 104; FIG. 15 - eight filter elements 102, and in FIG. 17 shows 25 filter elements 106. In each of FIG. 13 and 16 show a filter compartment 110 for mounting, respectively, filter elements 102 and 104 or 106 in accordance with the invention. However, the filter elements 102 and 104 and 106 themselves are not shown.

In FIG. 18 is a front cross-sectional view of a filter compartment 110, which was originally intended to fit cartridge filters 102 and 104 in accordance with the prior art. The filter wall 180 is bounded by the walls 142 of the filter compartment 110 and contains thirty-five rectangular holes 116. The holes 116 in the filter wall are arranged in rows so that there are five horizontal rows 136 or rows, as well as seven vertical rows 138 or columns parallel to each other.

In FIG. 19 is a front view of an intermediate plate 150 for attaching filters 100 to the filter wall 108 of FIG. 18. The intermediate plate 150 comprises one or more openings 152 into which filters 100 can be mounted from the front or rear.

In FIG. 20 is a view according to FIG. 18, when the intermediate plates 150 are mounted on the openings 116 of the filter wall 108 so that the filtered air must pass through the openings 152 of the intermediate plates 150. As you can see, one intermediate plate 150 is respectively superimposed on one hole 116. Thus, each of the holes 152 intermediate plates 150 covers the holes 116 of the filter wall 108.

In FIG. 21 is a top view of five V-shaped filter elements 106 when they are mounted on the intermediate plate 150. Two of these filter elements 106 are mounted on the dirty side 122 of the intermediate plate, and three of these filter elements 106 are attached to the clean side 124 of the intermediate plate. As a result, the filter elements 106 are arranged alternately, and each intermediate element 106 corresponds to one of the five holes 152. Thus, the front mounting surface 151 and the rear mounting surface 153 of the intermediate plate 150, each of which surrounds the holes 152, are optimally operated for mounting on it as as many filters 100 as possible, in this case, V-shaped filter elements 106. In FIG. 22, this is illustrated by a side view of V-shaped filter elements 106 mounted on an intermediate plate 150.

In FIG. 23 shows an intermediate plate 150 according to a further embodiment in which the front and rear mounting surfaces 151 and 153 for the filter elements 106 are angled or inclined to the closed region 155 of the intermediate plate 150. The closed edge region 155 surrounds the intermediate plate 150 on its outer rim and includes a seal 120 similar to the seal 120 of the filters 100. Thus, the closed edge region 155 provides a surface for mounting the intermediate plate 150 on the filter wall at 108. In FIG. 24, an intermediate plate 150 is shown on which the respective V-shaped filter elements 106 are mounted on the dirty side 122 and on the clean side 124. Angular arrangement of the corresponding front and rear mounting surfaces 151 and 153 allows the filter elements 106 to be installed obliquely with respect to the plane of the filter wall 108 On the inclined filter elements 106, water, droplets of which were trapped inside the filter material 128 packets 132 of filter materials, flows onto the dirty side 122 and flows out of the element 106.

In FIG. 25 and 26 are plan views of a further embodiment of an intermediate plate 150 and five V-shaped filter elements 106 that are mounted on said intermediate plate 150. The front and rear mounting surfaces 151 and 153 of the intermediate plate 150 on which the filter elements 106 are mounted are bent horizontally to the clean side 124 of the corresponding filter compartment 110. In contrast, the region 155 of the closed edge of the intermediate plate 150, which can be mounted and the filter wall is flat. By mounting the filter elements 106 on such a front mounting surface 151, which is concave, and on such a rear mounting surface 153, which is convex, it is possible to span the filter elements 106 on the clean side 124, which provides more space and therefore less discharge resistance for fluid flow on the clean side 124.

In FIG. 27-29, an additional V-shaped filter element 154 is shown, in this case, type C. The filter element 154 again includes to some extent a cubic or cuboid filter frame 118 with an inlet 126 on one side of the frame attached to the filter wall 108 (see Figs. 33 and 34). Within the filter frame 118 is a filter material 128 in the form of a bag 132 of filter materials. The filter frame 118 also represents the front side, the upper side, the lower side, and the rear side of the filter element 154 holding the filter material 128 between them, the cross section of which is a rather large letter V (Fig. 27). The filter element 154 is to be mounted on the corresponding filter wall 108 as a filter corresponding to a variant providing a downstream direction, i.e., the shape of the letter V of this V-shaped filter material 128 will be directed downstream or to the side of the clean gas, t .e. the clean side, indicated by 124, when the filter element 154 is finally mounted in the filter wall 108 (see FIGS. 34 and 37). Therefore, the filter element 154 includes two outlet openings 127 on its side surfaces directed to the clean side 124.

On the rectangular region 134 of the closed edge of the filter frames 118 of the filter element 154 — on its upper and lower horizontal edges — seals 120 are provided, each in the form of a linear gasket 166. The gaskets 166 also have an overlap 158 of the gasket at each of their horizontal ends, with an overlap of 158 the gasket protrudes above an area 134 of the closed edge of the flange portion 130 of the filter frame 118.

In addition, the closed edge region 134 provides positioning holes 160 in the middle of the upper and lower edges. In this case, the positioning hole 160 serves as the positioning means when the filter element 154 is mounted on the corresponding filter wall 108, as shown in FIG. 34.

In FIG. 30-32 shows a (second) V-type filter element 156 of type B. This type B filter element 156 also includes a filter frame 118 and a V-shaped filter material 128 enclosed therein. In contrast to the type A filter element 154, the filter type B element 156 is characterized in that the filter material 128 is installed in the opposite direction compared to type A filter element 154 (viewed in the direction of flow). In other words, the filter element 156 is to be mounted on the filter wall 108 as appropriate for the upstream direction, i.e., the shape of the letter V of this V-shaped filter material 128 will be directed upstream or towards the raw gas side, i.e. e. the dirty side, indicated by 122, when the filter element 154 is finally mounted in the filter wall 108 (see Figs. 35-37).

Similar to the filter element 154, the filter element 156 provides inlet and outlet openings, however, in this case, in the form of two inlet openings 12 6 directed to the dirty side 122, and one outlet 127 directed to the clean side 124. The outlet 127 forms the center a rectangular flange portion 130, which is partially stepped by the protrusions 157 on its upper and lower rims.

On the rectangular region 134 of the closed edge of the flange section 130 of the frames 118 of the filters of the filter element 154 — seals 120 are provided on its upper and lower horizontal edges and on its vertical left and right edges, each in the form of a linear gasket 168. Thus, the seals 120 surround closed edge region 134.

In FIG. 33 shows a filter wall 108 for mounting filter elements 154 and 156. This filter wall 108 includes horizontally directed beams or carrier beams 159 that extend from one side of the corresponding filter compartment 110 and its filter wall 108 to the other side. Thus, the carrier beams 159 are horizontal rows on which the filter elements 154 and 156 can be mounted side by side in alternating order.

As can be seen in FIG. 34, first the first filter elements 154 are mounted on the carrier beams 15 9 on the dirty side 122 of the carrier beams, whereby the bags 132 of filter materials are directed to the clean side 124 of the filter compartment 110 and are located on this side. When they are mounted, the filter elements 154 are positioned by means of their positioning holes 160 on the corresponding positioning studs 162, which are provided in each of the carrier beams 159.

After that, the filter elements 156 are mounted on the filter wall 108, positioning each filter element 156 between two adjacent filter elements 154. The filter elements 15 6 are again mounted on the dirty side 122 of the support beams 159, however, the packets 132 of filtering materials of the filter elements 15 6 are also directed in the dirty side 122 and place on it.

After mounting the filter elements 156, the filter wall 108 is finally closed by means of side rails 161 (see FIG. 36), which are attached to the portions of the left and right sides of each row between the two load-bearing beams 159 in order to cover the permissible free space 163 up to the filter wall 108.

Turning to FIG. 38 and 39, we note that the sealing assembly of the V-shaped filter elements 154 and 156 of types A and B for the supporting beams 159 of the filter wall 108 is shown here. As you can see, overlapping 158 gaskets of the filter elements 154 contributes to tight pressing against the border gasket lying behind it 168 protrusions 157 of the filter element 156.

LIST OF DRAWINGS POSITIONS

100 - Filter

102 - Cartridge filter type A

104 - Type B cartridge filter

106 - V-shaped filter element

108 - Filtration wall or separation wall

110 - Filter compartment of the flow channel

112 - The area of the crude gas or dirty area

114 - Area of clean gas or clean area

116 - Hole of the filter wall

118 - Filter frame

120 - Seal

122 - Raw gas side or dirty side

124 - Clean gas side or clean side

126 - Inlet in the filter frame

127 - Outlet in the filter frame

128 - Filter media

129 - Filter Edge

130 - Flange section

132 - Filter Bag

134 - The area of the closed edge of the flange section

136 - Horizontal row

138 - Vertical row

140 - Direction of flow

142 - Wall of the filter compartment

144 - Service door

146 - Inlet

148 - Outlet

150 - Intermediate plate

151 - Front mounting surface

152 - Hole within the intermediate plate

153 - Rear mounting surface

154 - Filter element (V-shaped), a variant providing for directivity downstream

155 - The area of the closed edge of the intermediate plate

156 - Filter element (V-shaped), an option providing directivity upstream

157 - Projection on the flange section

158 - Overlap gaskets

159 - Support beam

160 - Positioning hole

161 - Side railing

162 - Positioning pin

163 - Permissible free space

166 - Laying the filter, directed downstream

168 - Laying the filter upstream

Claims (14)

1. A filtration system, in particular for cleaning the incoming air of a gas turbine, comprising: a flow channel (110) surrounded by walls (142), with an inlet (146) and an outlet (148), a dividing wall (108), which is located between the inlet (146) and the outlet (148) and is limited by the wall (142 ) a flow channel (110) and at least two filters (100, 106, 156) for cleaning a fluid flowing through a flow channel (110), in which at least one first filter (100, 106, 156) forms one assembly unit and is mounted on the dividing wall (108) and at least one second filter (100, 106, 156) also forms one assembly unit and is mounted on the dividing wall wall (108), characterized in that in it the second filter (100, 106, 156) is located behind the first filter (100, 106, 156), while the first and second filters (100, 106, 156) at least partially overlap in one direction, mainly in the direction perpendicular separation wall (108). 2. The system according to claim 1, characterized in that it has an area on which the frames (118) of the first and second filters (100, 106, 156) overlap at least partially in one direction, mainly in the direction perpendicular the separation wall (108), is at least 5% of the total estimated filtration area in the separation wall (108). 3. The system according to any one of paragraphs. 1 or 2, characterized in that in it the filters (100, 106, 156) are located in at least one row (136) in the dividing wall (108), and the filters (100, 106, 156) of one row (136) protrude alternately to the dirty side (122) and to the clean side (124) of the separation wall (108). 4. A method of cleaning the inlet air of a gas turbine by means of a flow channel (110) surrounded by walls (142), with an inlet (146) and an outlet (148), a dividing wall (108), which is located between the inlet (146) and the outlet a hole (148) and is limited by the wall (142) of the flow channel (110) with at least two filters (100, 106, 156) for cleaning the flowing fluid, forming a single assembly unit mounted on a partition wall (108), and at least at least one second filter (100, 106, 156), which also r a single assembly unit which is mounted on the dividing wall (108), characterized in that in it the second filter (100, 106, 156) is located behind the first filter (100, 106, 156), while the first and second filters (100, 106, 156) at least partially overlap in one direction, mainly in the direction perpendicular separation wall (108). 5. The method according to p. 4, characterized in that in it the area on which the frames (118) of the first and second filters (100, 106, 156) overlap in one direction, mainly perpendicular to the dividing wall (108), is at least 5% of the total estimated filtration area in the dividing wall (108). 6. The method according to any one of paragraphs. 4 or 5, characterized in that the filters (100, 106, 156) are arranged in it in at least one row (136) in the dividing wall (108) and the filters (100, 106, 156) of one row (136) are mounted alternately protruding into the dirty side (122) and the clean side (124) of the separation wall (108). 7. A set of filters with at least one first filter (100, 106, 156), which is a single assembly unit and adapted for installation on a partition wall (108) of a filtration system according to one of claims. 1-3, and with at least one second filter (100, 106, 156), which is a single assembly unit and adapted for installation on a partition wall (108), according to any one of paragraphs. 1-3. 8. A kit according to claim 7, in which the second filter (100, 106, 156) is made with a filter frame (118), the corresponding filter material (128) of which is installed in the opposite direction — when viewed in the direction of the fluid flow through the partition wall (108) - compared with the first filter (100, 106, 156).

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