JP3769114B2 - Gas turbine performance deterioration prevention device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for preventing a decrease in performance of a gas turbine due to an increase in atmospheric temperature and dust in the air.
[0002]
[Prior art]
The filter of the conventional gas turbine intake dust remover needs to increase the fiber packing density and the lamination thickness in order to improve the dust removal performance. However, increasing the dust removal performance increases intake resistance and affects the performance of the gas turbine. For this reason, the dust removing device is designed to suppress the intake resistance and obtain the required dust removing property, but there is a problem that the dust passing through the dust removing filter adheres to the turbine blades and the performance is deteriorated.
[0003]
Although the dust removing apparatus described in Japanese Patent Laid-Open No. 5-285328 is a simple method, since the contact area between the filter and the air is small, the intake air cooling ability due to water evaporation is low. When the water spraying device system fails, the filter effect cannot be expected, and there is a concern that dust and mist are brought in.
[0004]
The intake air cooling dust removal apparatus described in JP-A-8-49561 has a cooling device outside, so that the cooling capacity is high, but the device is complicated, has many incidental facilities, and requires significant modifications to the existing plant.
[0005]
[Problems to be solved by the invention]
In recent years, in the case of thermal power generation, there is an increase in gas turbine combined power generation that has high power generation efficiency and requires a short construction period. The gas turbine has a problem that when the atmospheric temperature rises, the intake air mass decreases due to a decrease in air density, and thus the output decreases. Further, in the gas turbine, it is necessary to periodically polish the turbine blades with an abrasive in order that the dust that has passed through the dust removal filter adheres to the turbine blades and the performance deteriorates.
[0006]
Accordingly, it is an object of the present invention to provide a highly efficient dust removal method while cooling the intake air of a gas turbine simply and effectively.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is provided with a dust removal filter in an air intake duct of a gas turbine, the filter is a laminate of organic and inorganic fibers that keep innumerable spaces, a mesh assembly, Or a metal wool having a wide contact area with the air, supplying flush water from the top to the front of the upper end of the filter and flowing down or descending through the front of the filter and being captured by the filter An apparatus for preventing performance degradation of a gas turbine, characterized in that the air passing through the filter is cooled by latent heat of vaporization of the water, and a mist separator that separates splashes of flush water at the rear of the dust filter. The gas turbine performance lowering prevention apparatus according to the first invention described above, wherein the flushing water circulation supply device provided with the purifying device is disposed in the dust filter. The dust removal filter is an endless belt-like filter, the filter descends the atmosphere side, ascends the gas turbine side, flushes the flush water from the upper part of the atmosphere side filter, and flushes the water to the lower part of the atmosphere side filter. The apparatus for preventing performance degradation of a gas turbine according to any one of the first, second and third aspects of the present invention, wherein water is sprayed to clean the dust trapped in the atmosphere side filter. The gas turbine performance deterioration preventing device according to the third or fourth aspect of the present invention is also used.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, the dust removal filter 2 is installed in the air intake duct 1 of the gas turbine, the flushing water 3 is poured from the flushing device 4 'installed on the upper part thereof, and the dust adhering to the dust removal filter 2 is always washed away and wet. When the air passes through the dust filter 2 in the state, the washing water 3 evaporates and is cooled by the latent heat of evaporation. Further, the air that has passed through the dust removal filter 2 is supplied to the gas turbine after passing through a mist separator 5 that captures entrained water droplets and evaporates them to separate them from the air. The dust removal filter 2 is thinner than conventional filters, and is a laminate of organic or inorganic fibers with a wide contact area with air, a mesh-like structure, or a product filled with metal wool And The washing water circulation supply device 4 has a purification device by a filtering device 4 ″ for separating and discharging the washed-out dust. The mist separator 5 for separating splashes of the washing water 3 at the rear of the dust removing filter 2 includes a nonwoven fabric and a metal. A material stuffed with wool or the like is used, and examples are shown in FIGS.
[0009]
【Example】
The air intake and the intake port of the gas turbine are connected by an air intake duct 1, and a dust removal filter 2 is stretched inside the duct 1. This dust filter 2 is a laminated synthetic resin or metal fiber or organic fiber or inorganic fiber that keeps innumerable spaces where the mutual contact portions of synthetic resin filaments are heat-welded, a mesh-like one, or a metal It is made of wool and has a wide contact area with the air, and is supported by packing between the front and rear metal nets or expanded metal 2 ', 2 ". A mist separator 5 is provided at the rear of the dust filter 2 thus constructed. 3, the separator 5 is provided with an insertion slit on the outer periphery of the duct 1 as shown in Fig. 3, and is inserted into the duct 1 by inserting the separator 5 into the slit. Replace it with a new one by pulling it up.
[0010]
The mist separator 5 is also made by packing the above-mentioned non-woven fabric or metal wool between the front and rear nets or the expanded metal 5 ', 5 ". It is possible to use the dust filter 2 and the rear part as the mist separator 5.
[0011]
A drain pipe 4a for flush water 3 is disposed above the duct 1 at the upper end of the dust filter 2, and a flush water outflow nozzle 4b that opens from the pipe 4a to the inside of the duct 1 is provided from the nozzle 4b. Flushing water 3 is supplied to the front end of the top.
[0012]
A drain outlet is provided at the lower part of the lower end duct 1 of the dust filter 2, a water receiving tank 6 is provided at the lower part of the drain outlet, and a makeup water pipe 7 and a circulating water pipe 8 are connected to the water receiving tank 6. 8 is connected to the upper flushing device 4 ', and the flushing device 4' is provided with the distribution pipe 4a, and the flushing water circulation supply device 4 is formed by interposing the filter 4 "and the circulation pump P in the piping 8. A dust removal sludge discharge pipe 9 is provided at the bottom of the water receiving tank 6.
[0013]
The water 3 flowing out from the water-washing water pipe 4a arranged at the upper part of the dust filter 2 gathers in the lower tank 6 along the front part of the filter 2 and forms a circulation loop. The water 3 flowing down the filter 2 partially evaporates due to the dust removal of the filter 2 and the suction of air, thereby lowering the air suction temperature.
[0014]
The dust removal filter 2 is a laminate of organic or inorganic fibers that keep innumerable spaces where the mutual contact portions of bent synthetic resin or metal fibers or synthetic resin filaments are heat-welded, a mesh-like structure, or a metal A wool-made wool having a wide contact area with air, which is made of an endless belt-like filter 14 having air permeability and water retention, as shown in FIG. The drive train 15 disposed in the upper part and the idle train 16 disposed in the lower part are hung upright, and the idle train 16 is supported on the water surface 6 ′ in the water receiving tank 6. 14 lowers the atmosphere side (arrow a), raises the air intake side of the gas turbine (arrow b), and sprays flush water 3 from a nozzle 18 provided in a flush water supply pipe 17 below the atmosphere side filter 14. Atmospheric side fill The dust trapped in the filter 14 is washed into the tank 6 to wash the filter 14, and at the same time, the washing water 3 is supplied to the filter 14 to serve as a purification device. The supplied flush water 3 bypasses the idle train 16 along with the filter 14 and rises in the direction of the arrow b on the air intake side, further bypasses the upper drive train 15 and moves the atmosphere side in the direction of the arrow a. The washing water circulation supply device 4 is lowered and the dust in the suction air is attached to the washing water 3 that descends along with the filter 14 during the lowering, and the washing water 3 is sprayed below the atmosphere side filter 14. The operation of washing and trapping in the water in the tank 6 is repeated.
[0015]
In FIG. 1, 10 is an open / close valve provided in the dust removal sludge discharge pipe 9, and 11 in FIG. 2 is a supply water electromagnetic open / close valve which is controlled to open and close by a signal from the water level sensor 12. Further, reference numeral 13 in FIG. 3 is a slit facing plate provided in the duct 1. In FIG. 4, reference numeral 19 denotes a drive motor for the drive train 15.
[0016]
【The invention's effect】
Since the present invention is configured as described above, the following effects are obtained.
(1) When the atmospheric temperature rises in summer, when the intake air passes through the intake dust filter, it is cooled by the latent heat of evaporation of water, so that the output reduction of the gas turbine can be suppressed.
(2) Highly efficient dust removal with reduced intake resistance.
(3) Due to the high intake dust removal efficiency, dust adhesion to the turbine blades is reduced, and deterioration of gas turbine performance can be prevented.
(4) There is an effect that dust can be removed and cooled in the air intake duct and mist can be separated to simplify the apparatus.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view showing a gas turbine performance deterioration preventing apparatus according to the present invention.
FIG. 2 is a front view of the dust filter according to FIG. 1A-A.
FIG. 3 is a front view showing a state where the mist separator taken along the line B-B in FIG.
FIG. 4 is a side view of the dust filter of the present application.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Air intake duct 2 Dust removal filter 3 Flushing water 4 Flushing water circulation supply device 5 Mist separator 14 Endless belt filter

Claims (5)

A dust filter is installed in the air intake duct of the gas turbine, and the filter is a laminate of organic or inorganic fibers that keep countless spaces, one that is assembled in a mesh shape, or metal wool,
Flushing water is supplied to the front upper end of the filter from above, and flows down or descends along the front of the filter to clean the dust trapped in the filter, and the air passing through the filter is evaporated into water. An apparatus for preventing performance degradation of a gas turbine, characterized by cooling with latent heat. The gas turbine performance deterioration preventing device according to claim 1, wherein a mist separator for separating splashes of washing water is disposed at a rear portion of the dust filter. The apparatus for preventing deterioration in performance of a gas turbine according to claim 1 or 2, wherein a washing water circulation supply device including a purification device is arranged in a dust filter. The dust removal filter is an endless belt-like filter. The filter descends on the atmosphere side, ascends on the gas turbine side, flushes the flush water from the upper part of the atmosphere side filter, and sprays flush water on the lower part of the atmosphere side filter to The apparatus for preventing deterioration in performance of a gas turbine according to any one of claims 1, 2, and 3, wherein the dust trapped in the side filter is washed. The gas turbine performance deterioration prevention device according to claim 3 or 4, wherein the flush water circulation supply device is also used by an endless belt filter and flush water spray.

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