JP5721526B2 - Intake filter device for gas turbine - Google Patents

Description

  The present invention relates to an intake filter device for a gas turbine that is disposed in an intake system of a gas turbine facility and removes dust in the intake air.

  The gas turbine equipment includes an intake system including an intake chamber and an intake duct, a compressor, a gas turbine combustor, a gas turbine, and an exhaust system. For example, in a gas turbine facility used in a power plant, air (intake air) taken from an intake chamber is supplied to a compressor through an intake duct, where the intake air is compressed into high-pressure air. Furthermore, this high-pressure air is supplied to the gas turbine combustor together with fuel to generate combustion gas, and this combustion gas is supplied to the gas turbine to be expanded, and the generator is driven by the power generated at that time. Yes.

In general, dust having a particle size distribution in the range of 0.1 μm to 10 μm exists in the atmosphere, and when this dust is taken into the gas turbine equipment and adheres to the blades of the compressor, the fluid resistance increases. As a result, an output loss occurs, resulting in a decrease in power generation output.
Therefore, an intake filter device for removing dust in the intake air sucked into the compressor is accommodated in an intake chamber provided on the inlet side of the compressor.

  As disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2011-7193) and the like, an intake filter device is usually composed of a plurality of stages of filters. Here, as shown in FIG. 8, as the characteristics of particles such as dust, the adhesion force of the particles is determined based on the diffusion force and inertial force of the particles, and the adhesion force is minimized to a diameter smaller than 0.3 μm. It is known that a value exists. Therefore, in the conventional intake filter device, a HEPA filter has been used in order to reliably collect fine particles (near 0.1 μm) that have a low adhesion force and cannot be expected to have a high particle collection rate.

  For example, an air intake filter device that has been widely used in the past is a pre-filter that can remove about 30% of dust having a particle diameter of about 1 μm, and a pre-filter that is installed on the downstream side, and can remove about 70% of dust having a particle diameter of about 1 μm. It is composed of a performance filter and a HEPA filter that is installed on the downstream side of the medium performance filter and can mainly remove 99.97% or more of dust of about 0.3 μm. In addition, as an intake filter device that is further downsized, there is also a device in which a composite HEPA filter in which a medium performance filter and a HEPA filter are integrated is provided on the downstream side of the prefilter. For the high performance filters such as the HEPA filter and the composite HEPA filter described above, a separator type, a mini-pleat type, or the like is used in accordance with the filter accommodation form.

In such an intake filter device, coarse particles in the intake air are collected by the pre-filter, and medium to fine particles that could not be collected here are collected by the high-performance filter. Since the HEPA filter constituting the high-performance filter has a particle collection rate of 99.97% or more, the intake air sucked into the compressor can be made into ultra-clean air equivalent to a clean room.
As a high-performance filter, a quasi-HEPA filter having a particle collection rate of 95% or more with respect to 0.3 μm particles is also widely distributed. For example, Patent Document 2 (Japanese Patent Application Laid-Open No. 2010-255612) discloses a configuration in which this quasi-HEPA filter is used in a gas turbine intake filter device. Specifically, a configuration is described in which a quasi-HEPA filter is provided as a secondary filter, and a HEPA filter or a ULPA filter is provided as a downstream third-order filter.

JP 2011-7193 A JP 2010-255612 A

  However, in the conventional high-performance filter using the HEPA filter, the compressor blades are hardly contaminated by dust and the output of the gas turbine does not decrease, but there is a problem that the replacement life of the filter is extremely short. It was. Normally, the amount of dust attached to the filter increases as the operating time of the gas turbine equipment elapses, and therefore the filter differential pressure gradually increases. When the filter differential pressure reaches a preset filter exchange differential pressure, the filter is exchanged. In general, in a gas turbine facility, it is desired that the gas turbine equipment can be continuously operated (operating time is approximately 8760 hours) for at least one year without replacing the filter. However, when the HEPA filter as described above is used, the dust collection rate can be maintained high, but the filter is clogged early, and the gas turbine equipment must be stopped and the filter must be replaced before the periodic inspection. Things happen.

That is, in an intake filter device used for gas turbine equipment, it is required to extend the filter replacement life while maintaining a dust collection rate that does not cause a significant decrease in output. However, it is difficult to satisfy these conditions with a configuration in which a plurality of filters are simply provided as in Patent Document 1 or the like.
In addition, the HEPA filter used in Patent Document 2 and the like is expensive, and it is necessary to frequently replace the filter, which increases the running cost of the intake filter device.
Furthermore, the HEPA filter has a large pressure loss, while the gas turbine equipment requires a large amount of compressed air, which causes a problem that the intake chamber becomes large. The presence of a small amount of dust having a particle size of about 0.001 μm to 0.1 μm is useful for forming a purification space such as a clean room for producing an IC circuit. The HEPA filter is unnecessarily increased in cost because it hardly affects the reduction in compression efficiency due to dirt on the blades of the filter device.

One aspect of the present invention has been made in view of the above-described circumstances, and can increase the filter replacement life while maintaining a dust collection rate that does not cause a significant decrease in the output of the gas turbine. An object of the present invention is to provide an intake filter device for a gas turbine.

An intake filter device for a gas turbine according to an aspect of the present invention is an intake filter device for a gas turbine arranged in an intake system of a gas turbine facility, and is arranged in a plurality of stages in the airflow direction of the intake system, and each stage is A filter formed of one or a plurality of filter medium layers, and among the filter medium layers forming the plurality of stages of filters, the most downstream filter medium layer has a higher particle collection rate than the upstream filter medium layer. In addition, the particle collection rate of the most downstream filter medium layer is 95% or more and 99% or less with respect to particles having a particle diameter of 0.3 μm.

According to this gas turbine intake filter device, the most downstream filter medium layer has the highest particle collection rate among all the filter medium layers, so that from the upstream filter medium layer in order from coarse particles to fine particles. Dust can be efficiently removed step by step.
Moreover, since the filter medium layer on the most downstream side has a particle collection rate of 95% or more and 99% or less with respect to particles having a particle size of 0.3 μm, it does not cause a significant decrease in output of the gas turbine. It is possible to extend the replacement life of the filter while maintaining the dust collection rate. Here, when the particle collection rate of the filter medium layer on the most downstream side is less than 95%, the dust that has passed through the filter easily adheres to the blades of the compressor, the compression efficiency is lowered, and the output reduction of the gas turbine is remarkable. It becomes. On the other hand, if the particle collection rate of the filter medium layer on the most downstream side exceeds 99%, the filter is easily clogged and the filter replacement life is shortened. Therefore, the filter media layer on the most downstream side has a particle collection rate in the above-described range, so that the filter replacement life can be extended while maintaining the output of the gas turbine. In particular, the operating efficiency of the gas turbine equipment can be improved because the filter replacement life is longer than the periodic inspection period.
Furthermore, since the filter medium layer on the most downstream side is less expensive than the case where a HEPA filter is used, the cost of the intake filter device can be reduced as compared with the prior art. Note that a quasi-HEPA filter is preferably used as the most downstream filter medium layer.

  Generally, dust in the air occupies 30 to 50% having a particle size of 1 μm or less. As shown in FIG. 8 described above, particles in the air having a particle size of about 0.1 μm to 0.3 μm have a small inertial force and ride on the flow of the surface air of the compressor blade, and are difficult to adhere to the blade. On the other hand, particles having a size of 0.1 μm or less are so small that the inertial force does not become a problem, but they may adhere to the wing due to the large diffusion force. However, since the amount of particles of 0.1 μm or less contained in the atmosphere is extremely small, even if it adheres, the effect of increasing the surface roughness of the blade is small and does not cause a problem. Conventionally, however, a HEPA filter has been used to increase the collection efficiency of particles of about 0.1 μm, which has little effect on the decrease in power generation efficiency, leading to a reduction in filter replacement life and an increase in cost. Therefore, the present inventors used the HEPA filter having a particle collection rate of 99.97% and a filter having a particle collection rate of 95% to 99% in the present configuration to generate power generation efficiency data. As a result of the collection, it has been clarified that the decrease in the collection rate of fine particles due to the adoption of the filter of the present configuration does not significantly affect the power generation end efficiency. This is presumably because there are few fine particles in the atmosphere from the beginning, and fine particles do not adhere to the rotating compressor blades because they are mainly diffused and have little inertial force. Therefore, as described above, by using the filter configuration of this configuration, it is possible to extend the filter replacement life while maintaining high power generation efficiency at a low cost.

  In the gas turbine intake filter device, it is preferable that the most downstream filter medium layer has a particle collection rate of 97% or more and 98% or less with respect to particles having a particle diameter of 0.3 μm.

  Thus, by setting the particle collection rate of the filter medium layer on the most downstream side to 97% or more, the output of the gas turbine can be maintained higher and the particle collection rate is set to 98% or less. Thus, the filter replacement life can be further extended.

  In the gas turbine intake filter device, the filter medium layer adjacent to the most downstream filter medium layer among the upstream filter medium layers has a particle size of 40% to 50% with respect to a particle having a particle diameter of 0.3 μm. You may have a collection rate.

  As a result, it is possible to reliably remove medium particles from the dust in the intake air immediately before the filter medium layer on the most downstream side, and to remove some fine particles having a particle size of 0.3 μm or less. The amount of dust reaching the filter medium layer on the side is reduced, contributing to suppression of clogging of the filter medium layer on the most downstream side. Therefore, the filter replacement life can be extended. The intermediate layer may have a density gradient from coarse to dense from the upstream side to the downstream side.

  In the gas turbine intake filter device, the most downstream filter medium layer and the adjacent filter medium layer are integrated through an intermediate layer having a particle collection rate intermediate between these particle collection rates, and finally A stage filter may be formed.

  As described above, since the most downstream filter medium layer and the filter medium layer adjacent thereto are integrated, the installation area of the intake filter device can be reduced as compared with the case where each filter medium layer is installed separately. . Further, since the most downstream filter medium layer and the filter medium layer adjacent thereto are integrated through an intermediate layer having an intermediate particle collection rate, the most downstream filter medium layer is adjacent to this. The density of the filter medium does not change abruptly at the boundary with the mating filter medium layer, and dust can be prevented from concentrating and accumulating at this boundary.

  In the gas turbine intake filter device, the last-stage filter is formed by integrating the most downstream filter medium layer manufactured by a wet papermaking method and the adjacent filter medium layer in a semi-dry state and drying the filter medium layer. You may make it manufacture by.

  This makes it possible to easily and inexpensively manufacture a filter in which the most downstream filter medium layer and the filter medium layer adjacent thereto are integrated.

  In the gas turbine intake filter device, a main component of the filter medium layer on the most downstream side may be a glass fiber, and a main component of the adjacent filter medium layer may be a polyester fiber having an average fiber diameter larger than that of the glass fiber. .

  In general, the filter medium layer of the filter contains one or a plurality of types of fibers, and these fibers are used alone or in a material obtained by appropriately mixing these fibers, and an organic binder or an inorganic binder is used alone or mixed as necessary. In addition, it is manufactured. In this configuration, the fiber component contained most in the filter medium layer on the most downstream side is glass fiber, and the fiber component contained most in the filter medium layer adjacent thereto is polyester fiber. As a result, it is possible to easily and inexpensively manufacture the most downstream filter medium layer and the filter medium layer adjacent thereto.

An intake filter device for a gas turbine according to an aspect of the present invention is an intake filter device for a gas turbine disposed in an intake system of a gas turbine facility,
A plurality of stages are arranged in the airflow direction of the intake system, and each stage includes a filter formed of one or a plurality of filter medium layers,
Of all the filter media layers forming the multiple-stage filter, the most downstream filter media layer has a higher particle collection rate than this upstream filter media layer,
The most downstream filter medium layer and the filter medium layer adjacent to the most downstream filter medium layer among the upstream filter medium layers are intermediate layers having a particle collection rate intermediate between these particle collection rates. The final stage filter is formed by being integrated.

According to this gas turbine intake filter device, the most downstream filter medium layer has the highest particle collection rate among all the filter medium layers, so that from the upstream filter medium layer in order from coarse particles to fine particles. Dust can be efficiently removed step by step.
Further, since the filter medium layer on the most downstream side and the filter medium layer adjacent thereto are integrated, the installation area of the intake filter device can be reduced as compared with the case where each is installed separately. Further, since the most downstream filter medium layer and the filter medium layer adjacent thereto are integrated through an intermediate layer having an intermediate particle collection rate, the most downstream filter medium layer and the filter medium layer adjacent to the intermediate filter layer are adjacent to each other. The density of the filter medium does not change abruptly at the boundary with the mating filter medium layer, and dust can be prevented from concentrating and accumulating at this boundary.

As described above, according to one aspect of the present invention , the second filter medium layer located on the most downstream side of the plurality of stages of filters has the highest particle collection rate among the filter medium layers of all the filters. Dust can be efficiently removed stepwise from coarse particles to fine particles in order from the upstream filter medium layer.
Moreover, since the filter medium layer on the most downstream side has a particle collection rate of 95% or more and 99% or less with respect to particles having a particle size of 0.3 μm, it does not cause a significant decrease in output of the gas turbine. It is possible to extend the replacement life of the filter while maintaining the dust collection rate. Here, if the particle collection rate of the second filter medium layer is less than 95%, the dust that has passed through the filter tends to adhere to the compressor blades, the compression efficiency is lowered, and the output reduction of the gas turbine becomes remarkable. On the other hand, if the particle collection rate of the second filter medium layer exceeds 99%, the filter is easily clogged and the filter replacement life is shortened. Therefore, when the second filter medium layer has a particle collection rate in the above-described range, it is possible to extend the filter replacement life while maintaining the output of the gas turbine. In particular, the operating efficiency of the gas turbine equipment can be improved because the filter replacement life is longer than the periodic inspection period.
Furthermore, since the second filter medium layer is less expensive than the case where a HEPA filter is used, the cost of the intake filter device can be reduced as compared with the prior art.

1 is a schematic configuration diagram of an intake filter device according to an embodiment of the present invention. It is a schematic block diagram of the last stage filter shown in FIG. FIG. 4 is another schematic configuration diagram of the final stage filter illustrated in FIG. 1. It is a figure which shows the particle collection rate of the 2nd filter medium layer with respect to power generation end efficiency or a filter lifetime. It is a figure which shows the particle collection rate of the 2nd filter medium layer with respect to the dust inflow amount to a compressor. It is a figure which shows the change of the filter differential pressure with respect to operation time. It is a schematic block diagram of the intake-air filter apparatus which concerns on the modification of embodiment of this invention. It is a figure which shows the relationship between the particle size of dust, and adhesive force.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in this embodiment are not intended to limit the scope of the present invention, but are merely illustrative examples, unless otherwise specified. Absent.
With reference to FIG. 1 and FIG. 2, the structure of the intake filter apparatus which concerns on embodiment of this invention is demonstrated. Here, FIG. 1 is a schematic configuration diagram of an intake filter device according to an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram of a final stage filter shown in FIG.

  The gas turbine intake filter device 1 is disposed in an intake system of a gas turbine facility. The intake system includes an intake duct 11 that intakes air and an intake chamber 12 formed on the intake duct 11. The intake filter device 1 may be accommodated in the intake chamber 12. The intake air sucked into the intake chamber 12 from the atmosphere passes through the intake filter device 1 to remove dust in the intake air, and is then guided to the compressor of the gas turbine equipment.

  The intake filter device 1 includes filters 2 and 3 arranged in a plurality of stages in the airflow direction of the intake system. In the multistage filters 2 and 3, each stage is formed of one or a plurality of filter medium layers. Each filter medium layer is made of, for example, a woven or non-woven fabric of synthetic fiber such as polyester fiber, polyamide fiber, polyolefin fiber, or rayon fiber, woven or non-woven fabric of glass fiber, or a material obtained by appropriately mixing these, and if necessary, organic Add an appropriate amount of a mixed binder obtained by adding a single binder or an inorganic binder alone or in combination, and form it into a sheet by a wet papermaking method, dry method, spunbond method, melt blow method, etc., and then dry it May be manufactured.

The plurality of stages of filters 2 and 3 have different particle collection rates. Specifically, the intake filter device 1 includes a pre-filter 2 disposed on the most upstream side and a final stage filter 3 disposed on the downstream side thereof.
These filters 2 and 3 are fixed to the filter frame with an adhesive or the like while being accommodated in a filter frame (not shown), and are attached to the inner wall of the intake chamber 12 together with the filter frame. At this time, the accommodation form of these filters 2 and 3 may be a separator type or a mini-pleat type.

  The prefilter 2 preferably has a particle collection rate of 10% or more and 20% or less with respect to particles having a particle diameter of 0.3 μm. The prefilter 2 mainly removes large-diameter dust. Between the pre-filter 2 and the final-stage filter 3, a rectifying path 6 is provided for making the flow velocity of the intake air that has passed through the pre-filter 2 uniform.

  The final stage filter 3 is disposed on the first filter medium layer 31 disposed on the upstream side and on the downstream side of the first filter medium layer 31, that is, on the most downstream side of all the filter medium layers forming a plurality of stages of filters. A second filter medium layer 32. The first filter medium layer 31 and the second filter medium layer 32 are disposed adjacent to each other, and these layers may be bonded to each other, or may be integrated and manufactured at the time of manufacturing the filter.

  The first filter medium layer 31 has a particle collection rate lower than that of the second filter medium layer 32, and preferably has a particle collection rate of 40% or more and 50% or less with respect to particles having a particle size of 0.3 μm. Yes. As a result, it is possible to reliably remove the middle particles of the dust in the intake just before the second filter medium layer 32 and to remove some of the fine particles having a particle diameter of 0.3 μm or less. This reduces the amount of dust reaching the layer 32 and contributes to suppressing clogging of the second filter medium layer 32. Therefore, the filter replacement life can be extended.

The second filter medium layer 32 has a particle collection rate of 95% or more and 99% or less with respect to particles having a particle diameter of 0.3 μm. Note that a quasi-HEPA filter is preferably used as the second filter medium layer 32. This makes it possible to extend the filter replacement life while maintaining a dust collection rate that does not cause a significant decrease in the output of the gas turbine.
The first filter medium layer 31 is mainly composed of polyester fibers, the second filter medium layer 32 is mainly composed of glass fibers, and the polyester fibers of the first filter medium layer 31 are more than the glass fibers of the second filter medium layer 32. It is preferable that the average fiber diameter is large.

  Furthermore, as shown in FIG. 3, the final stage filter 3 has an intermediate layer 33 in which the first filter medium layer 31 and the second filter medium layer 32 have a particle collection rate intermediate between these particle collection rates. May be formed integrally. The intermediate layer 33 may have a density gradient from coarse to dense from the upstream side to the downstream side. Thereby, compared with the case where the 1st filter medium layer 31 and the 2nd filter medium layer 32 are installed separately, the installation area of the intake filter apparatus 1 can be reduced. Moreover, since the 1st filter medium layer and the 2nd filter medium layer are integrated via the intermediate | middle layer 33 which has these intermediate | middle particle collection rates, between the 1st filter medium layer 31 and the 2nd filter medium layer 32 The density of the filter medium does not change abruptly at the boundary, and dust can be prevented from concentrating and accumulating at this boundary.

  At this time, it is preferable that the final stage filter 3 is manufactured by integrating the first filter medium layer 31 and the second filter medium layer 32 manufactured by a wet papermaking method in a semi-dry state, and drying them. This makes it possible to easily and inexpensively manufacture a filter in which the first filter medium layer 31 and the second filter medium layer 32 are integrated.

  Here, the grounds for setting the particle collection rate of the second filter medium layer 32 in the above range will be described with reference to FIGS. These figures show the results of various experiments conducted by the present inventors. The intake filter device 1 used in these experiments employs the filter configuration shown in FIG. Specifically, a filter having a particle collection rate of 10% or more and 20% or less with respect to particles having a particle diameter of 0.3 μm is disposed as the prefilter 2 on the upstream side, and the first filter medium layer is disposed on the downstream side thereof. The intake filter device 1 in which the final-stage filter 3 in which the 31 and the second filter medium layer 32 are integrated is used. The final-stage filter 3 has a particle collection rate of 40% or more and 50% or less with respect to particles having a particle diameter of 0.3 μm, a first filter medium layer 31 mainly containing polyester fibers, and a particle diameter of A filter having a particle collection rate of 95% or more and 99% or less with respect to 0.3 μm particles, and a second filter medium layer 32 mainly including glass fibers having a fiber diameter smaller than that of the polyester fibers. Was used. In addition, as the last stage filter 3, what was manufactured by the wet papermaking method was used as shown in above-mentioned FIG.

  FIG. 4 is a graph showing the particle collection rate of the second filter medium layer with respect to the power generation end efficiency or the filter life. In the figure, the horizontal axis indicates the particle collection rate η (%) of the second filter medium layer 32 with respect to particles having a particle size of 0.3 μm. The particle collection rate η is represented on a logarithmic scale. The left vertical axis indicates the power generation end efficiency (%), and the right vertical axis indicates the filter replacement life (Hr). In this graph, the solid line indicates the power generation end efficiency curve, and the dotted line indicates the filter replacement life curve.

  As shown in the figure, the power generation end efficiency decreases as the particle collection rate η decreases. This is because when the particle collection rate decreases, the amount of dust passing through the second filter medium layer 32 increases, so that the dust that has passed through the filter easily adheres to the compressor blades and the compression efficiency decreases, and the output of the gas turbine decreases. It is to do. In particular, when the particle collection rate is less than 95%, the output reduction of the gas turbine becomes significant. As shown in FIG. 5, when the particle collection rate is less than 95%, the main reason is that the amount of dust flowing into the compressor increases rapidly. In addition, FIG. 5 is a figure which shows the particle collection rate of the 2nd filter medium layer with respect to the dust inflow amount to a compressor.

On the other hand, the filter replacement life decreases as the particle collection rate η increases. This is because the filter is easily clogged and the filter replacement life is shortened. In particular, when the particle collection rate exceeds 99%, it is less than one year, which is generally known as a periodic inspection period, and the filter must be replaced before the periodic inspection.
FIG. 6 is a diagram showing a change in the filter differential pressure with respect to the operation time. In the figure, a solid line shows a life curve of the intake filter device according to the present embodiment, and a broken line shows a life curve of an intake filter device using a composite HEPA filter as a comparative example. As shown in the figure, in the life curve of the comparative example, the filter differential pressure reaches the set filter differential pressure before the operation time reaches 5000 hours. On the other hand, in the life curve of the present embodiment, the filter differential pressure reaches the set filter differential pressure when the operation time is about 10,000 hours, and exceeds one year which is a general periodic inspection period. Therefore, it is not necessary to replace the filter until the periodic inspection time, and the power generation efficiency can be kept high.

As described above, according to the present embodiment, since the second filter medium layer 32 located on the most downstream side of the plurality of stages of filters has the highest particle collection rate among the filter medium layers of all the filters, the upstream side Dust can be efficiently removed step by step from coarse particles to fine particles in order from the filter medium layer.
Moreover, since the second filter medium layer 32 has a particle collection rate of 95% or more and 99% or less with respect to particles having a particle size of 0.3 μm, it does not cause a significant decrease in output of the gas turbine. It is possible to extend the filter replacement life while maintaining the dust collection rate.
Furthermore, since the second filter medium layer 32 is less expensive than the case where a HEPA filter is used, the cost of the intake filter device can be reduced as compared with the prior art.

  Furthermore, in the intake filter device 1 of the present embodiment, the second filter medium layer 32 preferably has a particle collection rate of 97% or more and 98% or less with respect to particles having a particle diameter of 0.3 μm. . Thus, by setting the particle collection rate of the second filter medium layer 32 to 97% or more, the output of the gas turbine can be maintained even higher, and the particle collection rate is set to 98% or less. The filter replacement life can be further extended.

FIG. 7 is a schematic configuration diagram of an intake filter device according to a modification of the embodiment of the present invention.
The intake filter device 1 ′ includes a prefilter 2 ′ that is a primary filter, a secondary filter 4 that is composed of a first filter medium layer 31 ′, and a tertiary filter 5 that is composed of a second filter medium layer 32 ′. Each filter is spaced apart with the rectification paths 7 and 8 interposed therebetween. Here, the prefilter 2 ′, the first filter medium layer 31 ′, and the second filter medium layer 32 ′ have the same configuration as the prefilter 2, the first filter medium layer 31, and the second filter medium layer 32 shown in FIG. 1.
As described above, the first filter medium layer 31 ′ and the second filter medium layer 32 ′ are spaced apart with the rectifying path 8 interposed therebetween, so that the intake air introduced into the second filter medium layer 32 ′ is rectified. Since it is made uniform, partial clogging can be prevented.

DESCRIPTION OF SYMBOLS 1, 1 'Intake filter apparatus 2 for gas turbines, 2' Pre filter 3, 3 'Final stage filter 4 Secondary filter 5 Tertiary filters 6, 7, 8 Rectification path 11 Intake duct 12 Intake chamber 31, 31' 1st Filter media layer 32, 32 'Second filter media layer 33 Intermediate layer

Claims (5)

A gas turbine intake filter device disposed in an intake system of a gas turbine facility,
A plurality of stages are arranged in the airflow direction of the intake system, and each stage includes a filter formed of one or a plurality of filter medium layers,
Of all the filter media layers forming the multi-stage filter, the most downstream filter media layer has a higher particle collection rate than the upstream filter media layer, and the most downstream filter media layers collect particles. rates are state, and are particle size 99% or less 95% with respect to 0.3μm particles,
The filter medium layer adjacent to the most downstream filter medium layer among the upstream filter medium layers has a particle collection rate of 40% or more and 50% or less with respect to particles having a particle diameter of 0.3 μm,
The most downstream filter medium layer and the adjacent filter medium layer are integrated through an intermediate layer having a particle collection rate intermediate between these particle collection rates to form a final filter. An air intake filter device for a gas turbine.   2. The intake filter device for a gas turbine according to claim 1, wherein the most downstream filter medium layer has a particle collection rate of 97% or more and 98% or less with respect to particles having a particle diameter of 0.3 μm. . The final stage filter is manufactured by integrating the most downstream filter medium layer manufactured by a wet papermaking method and the adjacent filter medium layer in a semi-dry state, and drying the integrated filter medium layer. The intake filter device for a gas turbine according to claim 1 . The main component of most downstream side of the filter media layer is a glass fiber, a gas according to claim 1, the main component of the filter medium layer adjacent characterized in that it is a great polyester fibers having an average fiber diameter than the glass fiber Intake filter device for turbine. A gas turbine intake filter device disposed in an intake system of a gas turbine facility,
A plurality of stages are arranged in the airflow direction of the intake system, and each stage includes a filter formed of one or a plurality of filter medium layers,
Of all the filter media layers forming the multiple-stage filter, the most downstream filter media layer has a higher particle collection rate than this upstream filter media layer,
The most downstream filter medium layer and the filter medium layer adjacent to the most downstream filter medium layer among the upstream filter medium layers are intermediate layers having a particle collection rate intermediate between these particle collection rates. An intake filter device for a gas turbine, which is integrated with each other to form a final stage filter.

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