JP4117174B2 - Gas turbine intake filter device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas turbine intake filter device used to clean intake air to a gas turbine such as a power plant, for example, and more particularly to an improvement on the intake side.
[0002]
[Prior art]
Conventionally, as shown in FIGS. 5 and 6, the gas turbine intake filter device includes, for example, a pre-filter b, a medium-performance filter c, and a high-performance filter in the casing a from the upstream side in the intake direction indicated by arrows in the drawing. A filter such as d is disposed, and a weather hood f is provided on the side of the intake port e of the casing a. Further, a demister g is provided at the intake port e of the casing a located downstream of the weather hood f to prevent moisture such as raindrops from entering the casing a. Further, a bird netting i is provided at the intake opening h of the weather hood f so as to prevent birds, insects and the like from entering the casing a. In the figure, j indicates an inspection door.
[0003]
[Problems to be solved by the invention]
In the case of the conventional gas turbine intake filter device, since the demister g of the intake port e of the casing a is placed side by side with the filter surface standing vertically so as to cover the intake port e, it is captured by the demister g. Moisture such as raindrops that have been transferred travels downward along the surface of the demister g, and the ventilation resistance increases as it goes below the demister g. In addition, since the demister g and the bird proof wire mesh i are provided separately, there is a disadvantage that the apparatus structure is complicated and the cost is increased.
Accordingly, an object of the present invention is to provide a gas turbine intake filter device in which the disadvantages of the prior art are eliminated.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present inventors have intensively studied and found that the above-described disadvantage can be solved by providing a demister at the intake opening of the weather hood instead of providing the demister at the intake opening of the casing.
The gas turbine intake filter device of the present invention has been made on the basis of such knowledge. As described in claim 1, the gas turbine intake filter device includes a filter inside the casing and a weather hood on the inlet side of the casing. , A demister is provided in the intake opening of the weather hood, the demister contains a filter medium in a frame body, and a pressing metal mesh is provided on one side of the demister, and the metal mesh side of the demister is in the intake direction. And the demister is provided so as to be inclined so that the inlet side is lowered.
The gas turbine intake filter device according to claim 2 is the gas turbine intake filter device according to claim 1, wherein a stop line is provided on the other side surface of the demister, and the filter medium is securely held in the frame body. In addition, the filter medium can be freely changed by releasing and refixing the retaining line.
[0005]
【Example】
Embodiments of the present invention will be described with reference to the drawings.
1 is a plan view of an embodiment of a gas turbine intake filter device of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a plan view of a demister used in the embodiment, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG.
As shown in the figure, the gas turbine intake filter device of the present embodiment has a pre-filter 2 (a special dry nonwoven fabric made of synthetic fiber having a blow-off shape (Nippon Mineral ( Model DS-L)), medium performance filter 3 (filter material made of glass fiber paper folded box shape, Nippon Mineral Co., Ltd. model ASTN), high performance filter 4 (glass fiber paper filter medium folded box shape) A filter medium having a shape, Nippon Ginshi Co., Ltd. model GCC) is disposed, and a weather hood 6 is provided on the side of the intake port 5 of the casing 1. Such a configuration is not particularly different from a conventional gas turbine intake filter device. The pre-filter 2 is not limited to the blow-off type shape, and is formed by, for example, a panel-shaped synthetic fiber dry non-woven filter medium (Model DS manufactured by Nippon Inorganic Co., Ltd.) or a glass fiber mat. A panel-shaped filter medium (manufactured by Nippon Inorganic Co., Ltd., model CM) can also be used.
[0006]
In this embodiment, the demister 7 provided in the intake port 5 of the casing 1 in the conventional gas turbine intake filter device is provided in the intake opening 6 a of the weather hood 6 instead of being provided in the intake port 5. .
[0007]
In the demister 7, a filter medium 7b is accommodated in a rectangular frame 7a, a pressing wire mesh 7c is provided on one side and a retaining line 7d is provided on the other side, and the filter 7b is placed in the frame 7a. The filter medium 7b can be freely replaced by releasing and re-fixing the retaining line 7d.
As the filter medium, a Saran monofilament synthetic resin fiber (an initial pressure loss of 35 Pa under a wind speed of 2.5 m / s, “Saran Lock Filter OM-150” manufactured by Asahi Kasei Kogyo Co., Ltd.) is used.
[0008]
In this embodiment, the holding wire mesh 7c of the demister 7 is provided toward the upstream side in the intake direction so as to have the function of a conventional bird-proof wire mesh.
[0009]
Further, the demister 7 is provided so as to be accommodated in the weather hood 6 and is provided so as to be inclined so that the intake port 5 side of the demister 7 is lowered so that it can easily flow downward. In addition, 6b in the figure shows a rain gutter which makes it easy to drain raindrops flowing from the demister 7 directly on the ceiling side of the weather hood 6 from the outside. Further, when the demister 7 is provided so as to be inclined as described above, it is possible to prevent the surface of the demister 7 from being covered with a film of raindrops, thereby preventing an abnormal increase in pressure loss.
In the figure, 8 indicates an inspection door.
[0010]
(Comparative experiment)
Next, in order to compare the collection efficiency and pressure loss of demister water droplets in the gas turbine intake filter device of the prior art shown in FIG. 5 or FIG. 6 and the gas turbine intake filter device of the present invention, FIG. A comparative experiment was conducted using a water collection test apparatus.
In FIG. 7, 11 is a blower, 12 is a test duct, 13 is a spray nozzle, and 14 is a demister. In this comparative test, the conventional demister 14 arranged in parallel to the blowing cross section as shown in the figure is compared with the arrangement of the demister of the present invention parallel to the blowing direction as the present invention. It was to be.
In this test, water is supplied from Q into the test apparatus, sprayed to the demister 14 through the spray nozzle 13, and the water flowing down along the louver is collected by Q1 and discharged. The water scattered and collected downstream of the demister 14 is discharged from Q2. In the figure, 15 is a differential pressure gauge. Water collection efficiency is expressed as Q1 / Q1 + Q2.
In this experiment, the external dimensions of the demister 14 were 610 × 610 × 25 mm, the wind speed was 2.5 m / s, and the amount of test water was 7.5 l / min.
[0011]
As a result of the above experiment, in the present invention, the water droplet collection efficiency is 99% or more and the pressure loss is 35 Pa, whereas in the conventional technology, the water droplet collection efficiency is 99% and the pressure loss is 60 Pa. It became.
Therefore, it was found that the pressure loss can be reduced by about 60% without reducing the water droplet collection efficiency in the present invention.
[0012]
As described above, the gas turbine intake filter device according to the present invention has a simple configuration, a low pressure loss, and moisture such as raindrops enters the casing as in the conventional case, compared to the conventional gas turbine intake filter device. It was confirmed that the same filtration performance could be achieved.
[0013]
【The invention's effect】
As described above, the gas turbine intake filter device of the present invention is a gas turbine intake filter device that includes a filter inside the casing and a weather hood on the intake port side of the casing, and includes a demister at the intake opening of the weather hood. As a result, compared to the conventional gas turbine intake filter device, it has a simple configuration, low pressure loss, and prevents moisture such as raindrops from entering the casing as in the conventional case, and has an equivalent filtration performance. Can be achieved.
Further, when the demister is provided with the wire mesh side facing the upstream side in the intake direction, the wire mesh can be used as a bird proof wire mesh, and it is not necessary to provide a special bird proof wire mesh.
Further, when the demister is provided to be inclined, it is possible to prevent the surface of the demister from being covered with raindrops in the form of a film without causing an abnormal increase in pressure loss.
[Brief description of the drawings]
FIG. 1 is a plan view of an embodiment of a gas turbine intake filter device of the present invention. FIG. 2 is a front view of the same. FIG. 3 is a plan view of a demister used in the embodiment. Sectional view [Fig. 5] Plan view of a conventional gas turbine intake filter device [Fig. 6] Front view of the same [Fig.
DESCRIPTION OF SYMBOLS 1 Casing 2 Pre filter 3 Medium performance filter 4 High performance filter 5 Intake port 6 Weather hood 6a Intake opening 6b Rain gutter 7 Demister 7a Frame 7b Filter material 7c Holding wire mesh 7d Stop line 8 Inspection door 11 Blower 12 Test duct 13 Spray nozzle 14 Demister

Claims (2)

A gas turbine intake filter device including a filter inside a casing and a weather hood on the intake port side of the casing, wherein a demister is provided in an intake opening of the weather hood, and the demister houses a filter medium in a frame body, A pressing metal mesh is provided on the entire side surface of the demister , and the demister is provided so that the metal mesh side of the demister is directed upstream in the intake direction and the demister is inclined so that the intake port side is lowered. Gas turbine intake filter device. A stop line is provided on the other side of the demister, the filter media accommodates firmly fixed state inside the frame, release of the stop line, the reconsolidation, claim 1, characterized in that a freely replaceable filter media The gas turbine intake filter device described.

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