JP2001152874A - Snow-attach preventing apparatus for suction filter of gas turbine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a snow-attach preventing apparatus for a suction filter of gas turbine capable of preventing filter from being clogged with snow by removing the snow inflowing from the suction port at the front face, so as not to make attachment to the filter. SOLUTION: A house 10 for a gas turbine is furnished with a suction port 17 to suck the air 30, and water drops and snow are removed from a room 24 by a demister 1, and the air removed of dust by a filter 16 flows to a duct inlet 23 from a room 25 and is led to the gas turbine. A water-sprinkling nozzle for sprinkling water in summer, etc., is installed at the inlet of the suction port 17, while another 7 for sprinkle water to the snow inflowing in winter is installed at the entrance to the room 24. The demister 1 is installed on the front face of the filter 16, to remove also permeating water drops, rainwater, and snow. The demister 1 is formed with an eliminator, a water louver, or a wire pad, and the inflowing snow is allowed to contain water using the nozzle 7, while the snow attached to the demister 1 is dropped off by the weight of the water contained, and will not attach to the filter 16. The differential pressure between inside and outside the filter 16 will not rise either.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing snow from adhering to a gas turbine intake filter. When snow adheres to an intake filter, the differential pressure of the filter increases to cause surging of the compressor. This prevents snow from adhering to the air and does not hinder the intake.

[0002]

2. Description of the Related Art A gas turbine has a high atmospheric temperature in summer and its output decreases. On the other hand, a gas turbine has a low atmospheric temperature in winter and can increase its output as compared with summer. On the other hand, when snow falls in winter, snow is sucked in at the time of intake of the gas turbine, the intake filter is clogged, the differential pressure inside and outside the filter increases, and as a result, the compressor causes surging and trips the gas turbine .

FIG. 7 is a side view showing a typical example of a turbine plant building. In the figure, a gas turbine building 10 and a steam turbine building 11 are erected on a gantry 21. 12 is a ventilation tube of the building 10, 13 is the building 11
Ventilation cylinders, each of which ventilates the building. Reference numeral 14 denotes a gas turbine, which is installed in the building 10. 1
Reference numeral 5 denotes an intake duct, which supplies intake gas to the gas turbine 14. 16 is a filter, 17 is an air inlet, and air 3
0 is sucked through the inlet 17, foreign matter and dust are removed by the filter 16,
Led to. Reference numeral 18 denotes auxiliary equipment, 19 denotes an oil tank, 2
Numeral 0 denotes a steam turbine which is installed in the building 11.

FIG. 8 is a cross-sectional view of the vicinity of the intake port, in which air 30 is sucked from the intake port 17 and the room 2 in the building 10
4, the dust is removed through the filter 16, flows into the room 25, is sucked into the duct inlet 23, passes through the duct (not shown), and is guided to the gas turbine. A watering nozzle 22 is attached to the inlet of the intake port 17,
Water is injected to cool the inflowing air, and the temperature of the air is lowered by two to three degrees, especially at high temperatures in summer, to suppress a decrease in output due to an increase in the air temperature of the gas turbine.

In winter, snow is sucked in from the air inlet 17 together with the air 30, and snow accumulated at the inlet of the air inlet 17 flows in with the air, and the room 24 in the building 10
Enters the filter 16 and is sucked into the filter 16, and snow adheres to the front surface of the filter and causes clogging. If the intake is continued in this state, the pressure difference between the inside and outside of the filter 16 increases, and the compressor breaks down and trips the gas turbine.

[0006]

As described above, in a gas turbine, air is constantly taken in from an intake port during operation, and air is supplied to the gas turbine through a filter. It accumulates and sucks in the snow with the air, which snow adheres to the filter and clogs the filter, increasing the differential pressure, causing the compressor to surging and, in the worst case, tripping the gas turbine. At present, no method has been established that can reliably prevent such snow from adhering to the intake filter, and measures to reliably prevent such snow from adhering have been more strongly desired than before.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a device for preventing snow from adhering to a gas turbine intake filter in which snow flowing from an intake port is reliably removed immediately before the filter and snow does not adhere to the filter. is there.

[0008]

The present invention provides the following means (1) to (6) to solve the above-mentioned problems.

(1) In a gas turbine intake system that draws air from an intake port provided in a building and guides the air to a gas turbine from a duct through a filter, a demister is disposed in front of the air inflow side of the filter. An apparatus for preventing snow from adhering to an intake filter of a gas turbine, wherein a water spraying means is provided at an upper portion of a front surface, and water is sprayed from the water spraying means so as to cover a front surface of the demister.

(2) The gas according to the above (1), wherein the temperature of the water from the water sprinkling means is set to be equal to or higher than the outside air temperature + 3 ° C. and at least 0 ° C. A device to prevent snow from adhering to the turbine intake filter.

(3) In the invention according to the above (1) or (2), the demister is a panel provided with a plurality of demister elements. (4) In any one of the above-mentioned inventions (1), (2) and (3), the demister arranges a plurality of plates, each having a smooth waveform or a triangular shape, at predetermined intervals, and each plate includes A device for preventing snow from adhering to a gas turbine intake filter, comprising: a member for damping a flow of water droplets or snow containing water adhering so as to intersect the flow direction at a predetermined pitch.

(5) In any one of the above-mentioned inventions (1), (2) and (3), the demister is formed by arranging wires in a lattice pattern. Prevention device.

(6) In any one of the above-mentioned inventions (1), (2) and (3), a water spraying means for an air inlet is provided on a front surface of the air inlet, and the water spraying means for the air inlet and the front face of the demister are provided. Wherein one of the water spraying means is operable.

In (1) of the present invention, if snow is mixed in the air flowing from the intake port, the snow is first hydrated by water spraying from the water spraying means in front of the demister, and the hydrated snow subsequently flows into the demister. The demister captures the wet snow, passes the air through the filter as it is and guides it to the filter.The filter removes dust and water droplets and guides it through the duct to the gas turbine, so that no water droplets enter the gas turbine. The wings and casing do not corrode due to the adhesion of water droplets. On the other hand, the hydrated snow captured by the demister has a sherbet-like shape and falls down with its weight to be removed, so that the snow does not adhere to the filter and is removed by the demister in front of the surface.

In (2) of the present invention, the temperature of the water sprinkled from the water sprinkling means is 3 ° C. lower than the outside air temperature even in winter.
The temperature is higher than 0 ° C. even at a low temperature, and the snow containing water adheres to the demister without freezing, so that it easily becomes sherbet-like and easily falls, thereby ensuring the removal of snow from the demister.

In (3) of the present invention, the demister is made up of a large number of demister elements, which facilitates manufacture and assembly. In (4), the demister is formed by forming a large number of corrugated plates or triangularly bent plates into predetermined gaps. It has water droplets that are configured to hold and overlap, and that adhere to the plate surface and flow together with air, and a member that dams hydrated sherbet-shaped snow, and air flows meandering through gaps, but water droplets Snow and sherbet-like snow adhere to the plate surface in the meandering flow process, and are stopped by the damming member.The water accumulates here, and the water falls down. Is discharged. Further, by providing such a demister, water drops and snow do not adhere to the filter, and the air flows smoothly, so that the pressure difference between the inside and outside of the filter does not increase, and the gas intake performance does not decrease. Water droplets can be reliably prevented from entering the turbine. Also in (5) of the present invention, water droplets or water-containing snow collides with the lattice-shaped wire to prevent intrusion into the inside, the attached water droplet is dropped downward, and the snow adheres to the lattice-shaped wire. (3),
The same effect as (4) can be obtained.

In (6) of the present invention, the water sprinkling means for the intake port is mainly used to cool the air by water sprinkling when the atmospheric temperature is high, such as in summer, and to inhale the air to suppress a decrease in the output of the gas turbine. It is not used when the temperature of the atmosphere is low, such as in winter, when snow accumulates. Conversely, the water spraying means on the front of the demister is used in winter to spray water when snow invades from the air inlet, to make the incoming snow wet, and to facilitate removal by the demister. Therefore, when these two watering means are switched and used according to the situation, the gas turbine can be operated effectively.

[0018]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a cross-sectional view of a device for preventing snow from adhering to a gas turbine intake filter according to an embodiment of the present invention. In the drawing, the arrangement of the whole building is as described in FIG. 7, and these explanations are omitted, but in the present invention, the demister 1 is provided on the front surface of the filter and the watering nozzle 7 is provided at the entrance of the room 24 immediately below the intake port 17. And will be described in detail below.

FIG. 1 is a view corresponding to FIG. 8 of the conventional example. In the figure, a watering nozzle 22 is provided at the inlet of the intake port 17 as in the conventional case. Water is sprayed to cool the air 30 and lower the temperature by a few degrees so that the air is sucked. In winter, watering from the watering nozzle 22 is stopped, because water droplets freeze due to watering. In this winter, snow is piled up at the inlet of the air inlet, and when snow falls, snow is sucked together with the air 30.

The demister 1 is provided on the front surface of the filter 16. When snow in winter is piled up, the upper watering nozzle 7 is operated in front of the demister 1, and water is sprinkled from the nozzle to make the incoming snow contain water before flowing into the demister 1. The temperature of the sprinkling water is 0 to avoid freezing.
° C or more and at least the atmospheric temperature + 3 ° C.
The air 30 and the snow containing water flowing into the demister 1 are completely removed by the demister 1 as described later. The air from which the snow has been removed flows into the filter 16, and the remaining dust and the like are removed by the filter 16. Supplied.

FIGS. 2A and 2B show the appearance of the demister described above, wherein FIG. 2A is a top view and FIG. 2B is a side view. In both figures, filters 16 are provided on both sides of a room 25, and a demister 1 is provided on the front surface of each of these filters.
Are arranged in parallel. The demister 1 and the filter 16 are supported in parallel on both sides by a support frame 6 to form a room 25. The outer demister 1 is composed of a large number of frame-shaped demister elements 2 and constitutes one panel-shaped demister 1.

The air 30 first flows into the demister 1 containing water droplets and water-containing snow from the rooms 24 on both sides, but the water droplets and snow are removed by a large number of demister elements 2, and subsequently flows into the filter 16, At 16, the dust is removed, and the air from which the water droplets and dust are removed flows into the room 25,
From here, it is supplied to a duct of a gas turbine not shown.

FIG. 3 is a view showing the inside of the demister element shown in FIG. 2 described above, wherein (a) shows an eliminator,
(B) shows a wire pad, and (c) shows a weather louver. A demister element is constituted by any of these. In FIG. 3A, the eliminator 3 is formed by forming a thin sheet made of vinyl chloride into a corrugated shape, setting the length to about 260 mm at predetermined intervals, for example, at intervals of 30 mm, and arranging many in parallel. A shielding plate 3 is provided at a predetermined pitch on each corrugated plate.
a is provided to catch water droplets and snow containing water as described later.

FIG. 3 (b) shows a thin wire made of zinc-iron wire arranged finely in a mesh form to form a square element of 610 mm, and a wire pad 4 is formed. The fine mesh is crushed with water droplets or snow containing water to remove it. The air is allowed to pass inside. FIG. 3 (c) shows a thin plate made of vinyl chloride which is bent linearly at a predetermined interval, for example, 30 mm.
The weather louver 5 is formed by arranging a plurality of the lengths about 120 mm in parallel at intervals and forming the weather louver 5.
The bent portions 5b are arranged at predetermined intervals to catch water droplets and snow containing water as described later.

FIGS. 4A and 4B show the appearance of the demister element described above, wherein FIG. 4A is a plan view and FIG. 4B is a side view. The demister element 2 includes a mounting flange 2a and a mounting frame 2b, and a drain hole 2c is provided below the mounting frame 2b. 3 (a), (b), and FIG.
One of the eliminator 3, the wire pad 4, and the weather louver 5 described in (c) is attached to constitute a demister element 2, and a large number of the demister elements 2 are supported by a support frame 6 as shown in FIG. 1 is configured.

FIGS. 5A and 5B show an example of snow removal by the demister element 2. FIG. 5A shows a state of snow removal by a weather louver, and FIG. 5B shows a state of snow removal by an eliminator. In FIG. 5 (a), the inflowing air 30 and the hydrated snow meander in the process of meandering through the gap 5c of the bent portion, and the hydrated snow 31 adheres to the plate surface, and the air flows toward the projecting portion 5a and the bent portion 5b. It moves together with 30, but becomes sherbet-like due to the water content, is dammed, and falls downward with its weight. Therefore, snow is almost removed by the weather louver 5, and only air flows into the filter 16, so that snow does not adhere.

In FIG. 5B, the inflowing air 30 and the water-containing snow meander through the gap 3b in the same manner as described above, and the snow adheres to the plate surface and moves together with the air 30 toward the shielding plate 3a. However, since it contains water, it becomes sherbet-shaped, where it is dammed and falls downward with its weight.
Although the example of the wire pad 4 is not shown, the wet snow collides with the fine mesh of the wire pad and adheres to the mesh, but forms a sherbet and falls down with its weight, so that only air passes.

In the above description of FIG. 5, an example of removing snow with the demister element 2 has been described. However, in a season other than winter such as summer, water drops such as rainwater flow into the demister. The inflowing water droplets also adhere to the plate in the same manner as the snow described above, and are blocked by the projecting portion 5a, the bent portion 5b in the weather louver 5, or the shielding plate 3a in the eliminator 3,
It is dropped down and removed.

The demister element 2 removes water droplets as described above, and if not discharged as a drain, the differential pressure increases if the state where water droplets or snow containing water adheres is long, and the ability to inhale air decreases. Therefore, if water droplets adhere, it is necessary to efficiently drop them as drain. FIG.
Shows the result of measuring the state of the differential pressure in each demister element described in FIG.

In FIG. 6, (A-1) and (A-2) denote eliminators 3 on both sides of the filter, and (B-1) and (B-
2) shows the weather louver 5, (C-1) and (C-2) show the wire pad 4, and (D) shows the state of only the filter without the demister, and shows the internal and external differential pressure. According to this result, the pressure difference rapidly increases with time in the absence of the demister (D), whereas the pressure difference increases in the eliminator (A-1), the weather louvers (B-1) and (B-2). Almost no increase is observed.

Further, wire pads (C-1) and (C-2)
However, although the water drops slightly pass through, the differential pressure is considerably lower than that of (D). If these eliminators 3, weather louvers 5, and wire pads 4 are provided, the water drops in the intake air are removed, and the filters are formed by the water drops. It can be seen that the pressure difference does not rise due to clogging, and that water droplets can be sufficiently prevented from entering the gas turbine.

[0032]

According to the present invention, there is provided an apparatus for preventing snow from adhering to a gas turbine intake filter. (1) In a gas turbine intake system, the filter sucks air from an intake port provided in a building and guides the air to a gas turbine through a duct through a filter. A basic feature is that a demister is disposed on the front surface on the air inflow side, and a water sprinkling means is provided above the front surface of the demister, and water is sprinkled from the water sprinkling means so as to cover the front surface of the demister. With such a configuration, the water flowing in from the watering means is made to wet the snow flowing therein, and the mist is dropped and removed by the demister, so that the filter is not clogged by the snow and the differential pressure does not increase. In this case, water droplets are not removed and do not enter the gas turbine, so that corrosion of the blades and casing of the gas turbine is prevented.

According to a second aspect of the present invention, in the first aspect of the present invention, the temperature of the water from the water sprinkling means is equal to the outside air temperature +3.
It is characterized in that the temperature is set to 0 ° C. or higher even if it is higher than 0 ° C. Such watering does not freeze the wet snow and facilitates removal by the demister.

In (3) of the present invention, the above (1),
In any one of the inventions of (2) and (3), the demister is a panel in which a plurality of demister elements are arranged. In such a configuration, manufacture and assembly are facilitated, and in (4), in any one of the above-mentioned inventions (1) to (3), the demister is formed by shaping a large number of corrugated plates or triangular plates into predetermined gaps. It has water droplets that are configured to hold and overlap, and that adhere to the plate surface and flow together with air, and a member that dams hydrated sherbet-shaped snow, and air flows meandering through gaps, but water droplets Snow and sherbet-like snow adhere to the plate surface in the meandering flow process, and are stopped by the damming member.The water accumulates here, and the water falls down. Is discharged. Further, by providing such a demister, water drops and snow do not adhere to the filter, and the air flows smoothly, so that the pressure difference between the inside and outside of the filter does not increase, and the gas intake performance does not decrease. Water droplets can be reliably prevented from entering the turbine. Also, in (5) of the present invention, water droplets or water-containing snow collides with the lattice-shaped wire to prevent intrusion into the interior, and the attached water droplets are dropped downward, and the snow adheres to the lattice-shaped wire. Is also dropped downward by its weight, so that the same effects as in the above (3) and (4) can be obtained.

According to a sixth aspect of the present invention, in any one of the first to third aspects of the present invention, a water spraying means for the air inlet is provided on the front surface of the air inlet, and the water spraying means for the air inlet and the front face of the demister are provided. Is characterized in that one of them can be operated. With such a configuration, when these two watering means are switched and used depending on the situation, the intake of the gas turbine can be effectively operated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which a snow adhesion preventing device is attached to a gas turbine intake filter according to an embodiment of the present invention.

FIGS. 2A and 2B show a demister and a filter of the snow adhesion preventing device according to one embodiment of the present invention, wherein FIG.
Is a side view.

3A and 3B are diagrams illustrating a structure of a demister of the snow adhesion preventing device according to the embodiment of the present invention, wherein FIG.
(B) shows a wire pad, and (c) shows a weather louver.

4A and 4B show the appearance of a demister element of the snow adhesion preventing device according to one embodiment of the present invention, wherein FIG.
(B) is a side view.

5A and 5B show the operation of a demister of the snow adhesion preventing device according to the embodiment of the present invention, wherein FIG.
(B) shows snow removal with an eliminator.

FIG. 6 is a diagram showing a state of a differential pressure of the snow removing device with respect to the gas turbine intake filter according to the embodiment of the present invention.

FIG. 7 is a representative side view of a turbine plant.

FIG. 8 is a cross-sectional view of the vicinity of an intake port of a conventional gas turbine.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 demister 2 demister element 3 eliminator 3a shielding plate 3b, 5c gap 4 wire pad 5 weather louver 5a projecting portion 5b bent portion 6 support frame 7,22 watering nozzle 16 filter 17 intake port 23 duct inlet 24,25 room 30 air 31 , 32 Snow

Continued on the front page (72) Inventor Haruhiko Kondo 1-15-1 Higashiko, Seigocho, Kitakanbara-gun, Niigata Pref. Tohoku Electric Power Co., Inc. 3-7-1, Tohoku Electric Power Co., Inc. (72) Inventor Hiroyuki Fujita 3-7-1, Ichibancho, Aoba-ku, Sendai-shi Tohoku Electric Power Co., Inc. (72) Inventor Hiroyuki Ogasawara, Ichibancho, Aoba-ku, Sendai 3-7-1, Tohoku Electric Power Co., Inc. (72) Inventor Yoshiyuki Doi 2-1-1, Araimachi, Arai-machi, Takasago-shi, Hyogo Pref.Mitsubishi Heavy Industries, Ltd. 2-1-1, Niihama Takasago Works, Mitsubishi Heavy Industries, Ltd. (72) Inventor Yasuhiro Hashimoto 2-1-1, Niihama, Arai-machi, Takasago-shi, Hyogo Inside Takasago Works, Mitsubishi Heavy Industries, Ltd.

Claims (6)

[Claims] In a gas turbine intake system, which draws air from an intake port provided in a building and guides the air to a gas turbine from a duct through a filter, a demister is provided on a front surface on an air inflow side of the filter, and a front surface of the demister is provided. An apparatus for preventing snow from adhering to a gas turbine intake filter, wherein a water spraying means is provided at an upper portion, and water is sprayed from the water spraying means so as to cover a front surface of the demister. 2. The gas turbine intake filter according to claim 1, wherein the temperature of the water from the water sprinkling means is set to an outside air temperature + 3 ° C. or higher and at least 0 ° C. or higher. Snow adhesion prevention device. 3. The apparatus for preventing snow from adhering to a gas turbine intake filter according to claim 1, wherein the demister is a panel provided with a plurality of demister elements. 4. The demister comprises a plurality of smooth wavy or triangularly bent plates arranged at predetermined intervals, and water droplets or water droplets adhering to each plate at a predetermined pitch so as to intersect the flow direction. The device for preventing snow from adhering to a gas turbine intake filter according to any one of claims 1 to 3, further comprising a member for blocking a flow of wet snow. 5. The apparatus for preventing snow from adhering to a gas turbine intake filter according to claim 1, wherein the demister has wires arranged in a grid. 6. A water sprinkling means for an air inlet is provided in front of the air inlet, and one of the water sprinkling means for the air inlet and the water sprinkling means in front of the demister can be operated. 4. The apparatus for preventing snow from adhering to a gas turbine intake filter according to any one of claims 1 to 3.