JP2005207292A - Air intake/ dust collecting device and air intake/ dust collecting method for gas turbines - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air intake device for gas turbines, which cleans intake air, cools the intake air to increase its density and enables further improvement of gas turbine output. <P>SOLUTION: This is an air intake/ dust collecting device for gas turbines which cools intake air to remove dusts, comprising a cooling means 3 which is connected to a cold heat source 2 to cool water, a spraying means 16 which sprays the water cooled by the cooling means 3 to the intake air, a cooling zone 29 in which the sprayed water and the intake air are contacted with each other, and an electric dust collector 10 which is provided at a rear stage of the cooling zone 29 and collects and removes the components contained in the intake air brought in contact with the water with static electricity. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an intake dust collection apparatus and an intake dust collection method for a gas turbine that removes impurities such as dust contained in intake air (intake gas) and has a cooling effect.

In a gas turbine (GT), a large amount of air is sucked, and the air is compressed by a compressor before adding fuel. Usually, this gas turbine is provided with clean air supply measures such as arranging an air filter (A / F) on the intake side in order to prevent output reduction due to dirt on the turbine blades (patent) Reference 1).
However, since the air filter is filtered and collected, the collected filter cloth becomes a consumable product due to clogging or the like over time and needs to be replaced with a new one. For this reason, the work of replacing the filter cloth of the air filter is periodically performed, and there is a problem in that a new article replacement cost is generated and the running cost is deteriorated. And it was necessary to process the used filter cloth as a waste, and the disposal cost etc. had generate | occur | produced.
Further, in a system in which an air filter is arranged on the intake side, resistance during intake occurs. In particular, when a large amount of air is sucked in the front stage of the gas turbine, there is a problem that the pressure loss increases due to the air resistance of the filter. And in the gas turbine system, it has led to the loss of the power cost accompanying intake.

On the other hand, it is known that by providing an intake gas cooling device in the front stage of the gas turbine, the efficiency and output of the GT are improved by cooling the intake air and increasing the specific gravity of the gas (Patent Document 2, Patent) Literature 3 etc.). In particular, in summer when the temperature of the intake air is high, it is effective to reduce the intake gas temperature in order to perform a high output operation. Gas cooling is also preferable because there is a certain limitation on the temperature of the turbine blade.
For the purpose of improving the efficiency, a device that lowers the intake gas temperature by the latent heat of water by spraying water into the intake air can be considered (see Patent Document 2).
However, the gas sprayed with water has a problem of damaging the GT turbine due to the accompanying water mist or ice fine particles. Further, as described above, when an air filter is used in the upstream stage of the gas turbine, more clogging problems occur due to water mist, and more replacement work and waste disposal are required.
Further, instead of spraying water, a device is also conceivable in which the gas is cooled by a heat exchanger using cold heat such as LNG to lower the intake gas temperature (see Patent Document 3).
However, when a heat exchanger is used, moisture in the gas condenses and adheres to the heat transfer surface due to cooling. This condensed water becomes a mist and accompanies the intake air, causing a problem of damaging the gas turbine. In addition, when the above-described air filter is used, more clogging problems occur due to water mist.
Also, in summertime, peak power is required during the daytime when the temperature is high, and the gas turbine is also required to have high power output. However, since it does not require much power at night, there is a need for load leveling as a countermeasure for peak power. There is also a demand for higher output only during the daytime.

Japanese Patent Laid-Open No. 10-246126 JP-A-8-49561 JP-A-10-238368

In view of the above problems, the present inventors have developed an intake device that cleans the sucked gas and cools the sucked gas to increase the gas density and further improve the output. , Earnestly studied. At this time, it is also important that the pressure loss due to the resistance in the apparatus is small at the time of intake, and the power cost associated with intake is small.
As a result, the present inventors solved this problem all at once by using an intake air dust collector in which an electrostatic precipitator was combined in the subsequent stage of the cooling area (cooling zone) with spray water without using an air filter, It has been found that a reduction in turbine output and blade damage can be avoided, and that the running cost of the system can be reduced and the gas cooling efficiency can be improved. The present invention has been completed from such a viewpoint.

That is, the present invention is an intake dust collector for a gas turbine that is installed in a front stage of a gas turbine and removes dust after cooling the intake air, and is connected to a cold heat source to cool water, and the cooling means Spraying the water cooled by the means to the intake air, the spray means, the sprayed water and the intake air are brought into contact with each other, a cooling zone, and a component in the intake gas that is provided in the subsequent stage of the cooling zone and in contact with the water. An intake dust collecting apparatus for a gas turbine including an electrostatic precipitator that collects and removes by static electricity is provided. The apparatus of the present invention is an apparatus that cools the intake air with cold water, removes condensed mist generated during the cooling, and removes dust contained in the intake air itself. Here, the components in the intake gas collected and removed by the electric precipitator include mist of water sprayed by the preceding spraying means in addition to the dust etc. contained in the intake air.
In the apparatus of the present invention, for example, a cooling tower can be installed, and the spraying means can be provided in the upper part of the cooling tower, and the cooling means can be provided in the lower part of the cooling tower. In the lower part of the electric dust collector, a liquid recovery part for storing water mist, washing water and the like is usually provided. Further, an SS (floating matter) removing device that separates and collects the stored liquid can be provided downstream of the liquid recovery unit.

In the gas turbine intake dust collecting apparatus of the present invention, an aspect including a circulation line for collecting water sprayed by the spraying means and spraying it again as circulating water is preferable. In this case, the water sprayed with the said spraying means can further be equipped with the isolation | separation means which isolate | separates and collects without passing through the said cooling means. Further, in addition to the spraying means, a cooling supply line 19 for supplying the circulating water to the cooling means without going through the cooling zone is provided, and the flow rate of the circulating water sent to the spraying means and the cooling supply line are sent. A mode having a valve mechanism capable of adjusting the flow rate of the circulating water is also possible. As a result, the sprayed circulating water is divided into a zone for the cooling means and a zone for bypassing it, and in the time zone where no electric power is required at night, the circulating water is not passed through the cooling means, In a time zone that requires cooling and freezing water and requires electric power in the daytime, the circulating water is allowed to flow through the frozen cooling means to efficiently thaw the ice and cool the circulating water.
In addition, it is also preferable that a temperature measuring device is installed in the circulation line, and the temperature measuring device and the valve mechanism are connected so that the opening / closing degree of the valve can be adjusted by the temperature of the circulating water. In this embodiment, the temperature of the circulating water line can be measured, and the temperature of the circulating water can be controlled by the valve.

Further, the present invention is an intake air dust collection method for removing dust after cooling the intake air at the front stage of the gas turbine, wherein the water is cooled by cold heat from a cold heat source, and is cooled in the cooling step. The intake dust collecting method includes a spraying step of spraying water to the intake air, and an electrostatic dust collecting step of recovering and removing components in the intake gas in contact with water by static electricity. Here, the water sprayed in the spraying step is preferably recovered after being cooled through the cooling step and used again in the spraying step as circulating water. Moreover, the replenishing water cooled through the cooling step can be mixed with the circulating water. In addition, the water sprayed in the spraying process can be recovered without passing through the cooling process and used again in the spraying process as part of the circulating water.
And the above-described gas turbine intake dust collector according to the present invention can be suitably used as a gas turbine power generation system by installing a gas turbine in the subsequent stage.

  According to the gas turbine intake dust collector of the present invention, first, highly efficient cooling of intake air is possible. That is, in the front stage of the electrostatic precipitator, for example, cold water is directly sprayed into the intake air (spray) instead of a heat exchanger (for example, a fin-and-tube heat exchanger) that indirectly cools through a heat transfer surface, Cool efficiently in the cooling zone. That is, the cooling water can be sprayed water (hogging water) and brought into direct contact with the intake air to cool the gas over the entire surface of the water. At the same time, a certain amount of dust in the gas is removed in the spraying means and the cooling zone.

  Secondly, according to the intake dust collecting apparatus of the present invention, high-efficiency removal by two-stage removal action of soot can be performed. That is, the spray water sprayed at the front stage of the electrostatic precipitator has a large area that can come into contact with the dust in the intake gas, and can effectively adsorb impurities. Next, in the subsequent electrostatic precipitator, the remaining dust components that have not been removed can be completely removed. At the same time, the electrostatic precipitator removes the mist component of the water sprayed in the previous stage. Thereby, for example, the turbine output can be maintained as high as the design value without attaching impurities such as dust and water mist to the blades of the gas turbine.

Thirdly, according to the intake air dust collector of the present invention, it is possible to purify the electrode by self-cleaning in the electrostatic precipitator. Here, the electrostatic precipitator can be flushed with water from the top in order to clean the electrodes, like a normal wet electrostatic precipitator, but water mist is sent by the spray water in the previous stage. Thus, self-cleaning is performed by the purification action of water (water mist) in the flowing intake gas. Therefore, a process of flowing dedicated cleaning water from the upper part of the electrostatic precipitator to the electrodes or the like during operation is not usually required.
In addition, in the present invention, it is effective to use different operation methods for daytime and nighttime, particularly in the embodiment shown in FIG. In other words, at night, most of the water circulating in the cooling zone is bypassed by the separating means such as a partition plate, while the water in the vicinity of the cooling means is made into ice with a high heat storage effect by using the cold heat of the cold heat source. Convert it. By adjusting the amount of circulating water that passes through the cooling means during the daytime, it is possible to control the circulating water at a constant temperature without increasing the capacity of the cooling heat source by operating while melting the ice in the cooling means. is there. Specifically, when the temperature is higher than the set value, the flow rate flowing through the cooling supply line is increased. Conversely, when the temperature falls, the valve mechanism is closed and the cooling zone is bypassed, so that the temperature can be controlled to be constant regardless of the intake air temperature. As a result, the load can be leveled.

As described above, the intake dust collector according to the present invention can perform efficient cooling and dust removal by spraying water spray on the intake air, and water mist removal and dust removal by an electric dust collector at the same time. Is possible. Since dust and the like in the intake gas are cleaned with high efficiency, a reduction in output of the gas turbine, damage to the blades, and the like are avoided by the purified intake air. Further, since the intake air is sufficiently cooled, the gas density can be increased, and the gas turbine output can be further improved. Furthermore, since an electrostatic precipitator is used, there is almost no pressure loss due to resistance in the apparatus during intake, and the power cost associated with intake is sufficient. In addition, it does not require consumables such as air filters and can be operated without maintenance for a long period of time, contributing to a reduction in running costs and waste.
In the present invention, the operation method is selectively used during the daytime and at night, and at night, the water in the cooling means is converted into ice having a high heat storage effect by using the cold energy of the cold heat source, and the daytime operation is performed while melting the ice. By doing so, it is possible to control the circulating water at a constant temperature without increasing the capacity of the cold heat source. As a result, it is possible to effectively use the nighttime energy with sufficient capacity in the daytime, and it is possible to level the load.

The best mode for carrying out the present invention will be described in detail. However, the present invention is not limited to these embodiments. Embodiments of a gas turbine intake dust collector according to the present invention will be described below with reference to the accompanying drawings.
Embodiment (Part 1)
This embodiment is for showing an example of a basic system configuration of the present invention, and is a form in which the cooling means 3 is provided inside the cooling tower 1. That is, in the apparatus of the present embodiment, the cooling means 3 (ice production tank) is installed at the bottom of the cooling tower 1, and a part or all of the cooling water in the cooling tower 1 passes through the circulation line 22 or the like. It is an air intake dust collecting apparatus provided with the circulating cooling tower 1 and the electric dust collector 10 installed continuously in the subsequent stage. The intake air dust collector of the present invention includes a mode in which the cooling means 3 is separately provided outside the cooling tower 1 and is not limited to the present embodiment.
FIG. 1 shows an outline of the system configuration of the present embodiment, which will be described with reference to FIG.

Air is introduced from the top of the cooling tower 1 as intake air. In the cooling tower 1, the spray means 16 (spray nozzle) attached to the circulating water piping 23 is installed in the upper part. By opening the valve 13, water is sprayed (sprayed) from the spraying means 16 and scattered in a mist form. As a result, in the cooling zone 29 in the cooling tower 1, the intake air comes into direct contact with the sprayed water and is efficiently cooled. Most of the water sprayed from the upper part of the cooling tower 1 passes through the cooling zone 29 and flows down to the lower part of the cooling tower 1, but a part of the water component moves with the intake air as water mist.
The cooled intake air is sent to the electrostatic precipitator 10 provided in the subsequent stage through the pipe. An electrostatic precipitator is a device that circulates a gas containing dust in an electric field between electrodes, collects the dust by corona discharge, and collects dust by static electricity. The electric dust collector 10 removes water mist sprayed from the cooling tower 1 and soot in the gas. Although the spray nozzle 17 attached to the piping 24 through the valve | bulb 14 is provided in the upper part of the electric dust collector 10, the valve | bulb 14 can be normally drive | operated without spraying water in a closed state. However, when cleaning the inside of the electrostatic precipitator 10 or cleaning the electrodes, the valve 14 can be opened to spray water.

  A liquid recovery unit 8 is provided below the electric dust collector 10. During the normal operation, the liquid recovery unit 8 collects the liquid by the water mist collected after being sprayed by the spraying means 16 or the dust collected and collected in the intake gas. Further, when cleaning the electric dust collector 10, the cleaning liquid sprayed from the valve 14 is also collected. The liquid stored in the liquid recovery unit 8 is sent to the SS (floating matter) removing device 7 through the pipe 25. In the SS removing device 7, after components such as dust are removed, the purified liquid is returned to the lower part of the cooling tower 1. Contaminated liquid is discharged out of the system as wastewater and sent to wastewater treatment facilities etc. to control and manage the quality of the liquid in the circulating system. When drainage is discharged, the amount of water for cooling is usually kept above a certain level by adding makeup water into the system. In addition, since the intake air that is the subject of the present invention is normal air and contains a small amount of dust, the amount of contaminated liquid is usually small even with respect to the liquid collected by collection. As the SS removing device 7, a filtration device is usually used.

On the other hand, in the present embodiment, the cooling means 3 is provided inside the cooling tower 1. Therefore, the water component sprayed from the upper part of the cooling tower 1 and passed through the cooling zone 29 flows down to the cooling means 3 (ice production tank) provided in the lower part of the cooling tower 1. A cooling pipe 4 is provided inside the cooling means 3, and the water that has flowed down is cooled to 20 ° C. or less, preferably 15 ° C. or less, by the produced ice or the ice being produced. The cooling pipe 4 is connected to the cold heat source 2 outside the cooling tower 1 via pipes 27 and 28, and the refrigerant flows through the inside during ice production.
The water cooled by contact with the cooling means 3 or the overflowed water exceeding the capacity in the ice production tank further flows down in the cooling tower 1. A liquid reservoir 5 is provided at the lowermost portion in the cooling tower 1, and a part of the water that has flowed down from the cooling means 3 and the water that has passed through the cooling zone 29 accumulates.

The water stored in the liquid reservoir 5 is sent to the circulation line 21 by the circulation pump 6. The circulation line 21 is connected to the line 20 from the makeup water via the valve 12 which is a flow rate adjusting valve. The circulation line 22 after being connected to the line from the makeup water is provided with a valve 13 before branching in the upper part of the cooling tower 1. After the valve 13 that is a flow rate adjusting valve, the flow branches to a circulating water pipe 23 connected to the upper part of the cooling tower 1 and a cleaning pipe 24 that leads to the upper part of the electrostatic precipitator 10 via the valve 14.
In the present embodiment, a pipe line 20 for supplying makeup water is provided above the cooling means 3 in the cooling tower 1 via a valve 11 at the makeup water inlet. The line 20 is provided with a branch above the cooling means 3, and the branch line is provided with a nozzle 15 for supplying makeup water to the cooling means 3. If this replenishment water branch line is used, for example, the replenishment water can be cooled and supplied to the circulation line 21 by supplying the replenishment water from the nozzle 15 to the cooling means 3.

Specific examples of the cold heat source 2 connected to the cooling means 3 in the present embodiment include a method that uses cold heat of liquefied natural gas (LNG) that is a fuel of a gas turbine power plant. Such a method is effective when the gas turbine power plant is provided in the vicinity of the LNG terminal.
In addition, there is also a method (eco ice method) in which a cold electricity source is obtained by changing the phase of the refrigerant with electric energy and freezing it at a cheap electricity rate at night or when there is a sufficient load. In the case of this method, the frozen refrigerant is melted with circulating water in the cooling means under conditions where the daytime temperature is high. In this method, ice is produced in a time zone in which there is a surplus in nighttime power, and the ice is used as a cooling means in the daytime time zone. This method is particularly effective as a means for leveling the load because it can cope with peak power demands such as daytime in summer when load fluctuation is large.

Hereinafter, an example of an operation method in the case of using the intake air dust collector of the present embodiment will be described.
For example, when the above-mentioned eco ice method is adopted as a cold heat source, ice is produced in the cooling means 3 (ice production tank) using cheap electric power at night. At this time, the valve 12 is in the closed state or the most closed state, and ice is produced with the makeup water. The valves 13 and 14 can be closed. In addition, in the condition where harmful gas is inhaled, it can be dealt with by operating while absorbing the valve 13 in the open state, but in this case, the ice production tank is preferably arranged separately from the cooling tower 1. .
Next, during the daytime, the amount of water circulation is adjusted by adjusting the opening of the valve 13, and the intake gas temperature by the spray water from the spray nozzle 16 is adjusted. If necessary, the amount of water circulation is increased by the circulation pump 6 to enhance the cooling effect. At this time, the amount of the spray water can be determined by appropriately changing depending on the environmental temperature and humidity during operation, the cleaning of the intake air, etc., and is not particularly limited. For example, the intake air amount (1 Nm to be cooled) ³ / h) is usually supplied in an amount of 0.5 to 10 liters, preferably 0.5 to 2 liters. The droplet diameter of the spray water is not limited in the same manner, but is usually in the range of 100 μm to 5 mm, preferably 150 μm to 250 μm.

Moreover, an example of the driving | running method which controls a cooling effect using the circulating water of an apparatus is demonstrated.
In the intake dust collecting apparatus of the present invention, the sprayed water can be circulated and used as circulating water. However, since a certain amount of water comes out of the system from the inside of the apparatus, the valve 11 is opened during operation. It is necessary to supply a certain amount of makeup water. When supplying the makeup water, the circulating water temperature can be controlled by adjusting the opening of the valve 12 and adjusting the amount of the makeup water flowing through the cooling means 3 where the ice is produced.
That is, since the temperature of circulating water is cooled by the cooling means 3, the temperature of makeup water is high. Therefore, when supplying makeup water directly to the circulation line 22 via the valve 12, the temperature of the circulation water rises to a certain extent by the amount of heat of the makeup water. On the other hand, when supplying the replenishment water to the cooling means 3 through the nozzle 15 by bringing the valve 12 to the closed state or close to the closed state, the replenishment water is cooled and then stored in the liquid reservoir 5 due to overflow or the like. Since the liquid is fed from the liquid reservoir 5 together with the circulating water through the circulation line 21, the temperature of the circulating water is kept low. Thus, by adjusting the opening degree of the valve 12, the temperature of the circulating water sprayed into the intake air can be controlled, and consequently the cooling effect of the intake air as the gas cooling device can be controlled.

Embodiment (2)
In addition to the basic system configuration of the first embodiment (part 1), the present embodiment includes a separation unit that separates and collects sprayed water, a cooling supply line, a valve mechanism that can adjust the flow rate, and the like. An example is shown.
FIG. 2 shows an outline of the system configuration of the present embodiment, which will be described with reference to FIG.

Similar to the first embodiment (part 1), the water sprayed by the spraying means 16 scatters downward in the form of a mist. In the cooling zone 29 in the cooling tower 1, the intake air comes into direct contact with the sprayed water and is efficiently cooled. The water sprayed from the upper part of the cooling tower 1 passes through the cooling zone 29 and flows down to the lower part of the cooling tower 1, and at this time, most of the water is cooled by the presence of the partition plate 9 as a separating means. Bypass without going through 3 and reach the liquid reservoir 5.
The water stored in the liquid reservoir 5 is sent to the circulation line 21 by the circulation pump 6. The circulation line 21 is connected to the line 20 from the makeup water via the valve 12 which is a flow rate adjusting valve. After being connected to the line from the makeup water, the flow path of the circulating water branches into the circulation line 22 and the cooling supply line 19 in the present embodiment. The cooling supply line 19 includes a valve mechanism 18 at an inlet portion thereof. If the valve 18 which is a flow rate adjusting valve is closed, the circulating water is led to the circulation line 22 and reaches the circulating water pipe 23 connected to the upper part of the cooling tower 1 and the upper part of the electric dust collector 10 via the valve 14. Branches to the cleaning pipe 24. If the valve 18 which is a flow rate adjusting valve is opened, a part of the circulating water is guided to the cooling supply line 19 and supplied to the cooling means 3 without passing through the cooling zone 29. The flow rate of the circulating water sent to the spraying means 16 and the flow rate of the circulating water sent to the cooling supply line 19 can be controlled by adjusting the valve 18.

In the present embodiment, a temperature measuring device 38 is installed in the circulation line 21 so that the temperature of the circulating water can be measured. When the temperature of the circulating water is measured and the temperature is higher than the set value, a command is sent to the connected valve 18 so as to increase the flow rate flowing through the cooling supply line 19 and the opening degree is increased. Thereby, since circulating water is sprayed directly on the cooling means 3, it receives a big cooling action and falls in temperature.
On the other hand, when the temperature of the circulating water falls, a command is sent to close the valve 18 and the spray means 16 sprays through the circulation line 22. The water sprayed from the spraying means 16 bypasses the cooling means 3 due to the presence of the partition plate 9 and reaches the liquid reservoir 5. Thereby, circulating water does not receive the cooling effect | action of the cooling means 3, and temperature becomes difficult to fall. In this way, the water sprayed in the spraying process is recovered without passing through the cooling process of the cooling means, and can be sprayed again as a part of the circulating water, so that it is constant regardless of the temperature of the intake air. Temperature can be controlled. As a result, the load can be leveled.
In the present embodiment shown in FIG. 2, it is particularly effective to use different operation methods during daytime and at night. At night, most of the water circulating in the cooling zone 29 is bypassed by the cooling means 3 by the separating means such as the partition plate 9, while the water in the vicinity of the cooling means 3 is used for the heat storage effect by using the cold heat of the cold heat source 2. Convert to high ice. During the daytime, the amount of circulating water passing through the cooling means 3 is adjusted to operate while melting the ice in the cooling means 3, so that the capacity of the cooling heat source 2 is not increased and the circulating water is controlled to a constant temperature. Is possible.

Embodiment (Part 3)
The present embodiment is an integrated intake dust collecting device 30 in which a spraying means 37 and a cooling zone 29 are provided in a container that houses the electrostatic precipitator 10 without using a cooling tower. Moreover, in the apparatus of this form, although the cooling means 3 is installed in the lower part of the electrostatic precipitator 10, it is not limited to this form. FIG. 3 shows a schematic configuration diagram of a system according to the present embodiment.
A spray means 37 is provided in the upper part 40 of the intake dust collecting device 30 through a valve 31, and further, a cooling zone 29 and the electric dust collector 10 are accommodated. The upper portion 40 of the intake air dust collector 30 is longer than the lower portion 41 of the intake air dust collector 30 with respect to the flow direction of the intake air, and the spray means 37 is provided in the upstream portion and the electrostatic precipitator 10 is provided in the downstream portion. . The lower part 41 of the intake dust collecting device 30 is provided under the electric dust collector 10 installed in the wake part of the upper part.

In the lower part 41 of the intake dust collecting device 30, the cooling means 3 and the circulating water reservoir 42 are partitioned by a partition plate 35. The cooling means 3 is connected to the external cold heat source 2 via pipes 27 and 28. A pipe is provided from the liquid reservoir portion 42 so as to send the recovered liquid to the SS removing device 7. The purified liquid is sent to the circulation pump 6 line as circulating water. The dirty liquid is discharged out of the system as waste water from the SS removing device 7, and the water quality of the circulating liquid is controlled and managed.
The circulating water purified by the SS removing device 7 is sent to the intake dust collector upper part 40 by the circulation pump 6 and branched. Usually, it is guided to the spraying means 37 through the valve 31 and sprayed, but is sent to the spray nozzle 36 through the valve 33 when the electric dust collector 10 is cleaned. Further, the supply amount of the makeup water is adjusted by adjusting the opening of the valve 32 and is sent to the lower part 41 of the intake dust collecting device. The point that it is cooled and then overflowed to the liquid reservoir portion 42 by supplying it to the cooling means 3 is the same as the operation in the first embodiment (part 1).

Embodiment (part 4)
The present embodiment is a system in which an intake dust collecting apparatus according to the present invention is installed in the front stage of a gas turbine plant. 4 and 5 are schematic configuration diagrams of the system according to the present embodiment.

The system of FIG. 4 is a form in which an intake dust collector is attached to the front stage of the gas turbine plant of the thermal power plant.
The gas turbine power plant includes an air compressor 50, a gas turbine combustor 51, a gas turbine 52, and a generator 53. The gas (air) sucked by the air compressor 51 is compressed to increase the pressure, and the high-pressure air is supplied together with fuel to the gas turbine combustor 51, where combustion gas is generated, and the combustion gas is expanded by the gas turbine 52. The generator 53 is driven by the rotational torque generated during the work.
In the system according to the present embodiment, the intake air dust collector according to the present invention is provided in the front stage of the air compressor 50, and the cooling tower 1 having the spraying means and the electric dust collector 10 are sequentially provided along the flow of the intake air. In addition, a cold heat source (not shown) is provided outside the intake air dust collector. Further, the cooling tower 1 has a cooling means 3 such as an ice production tank.

For example, at the time of start-up operation where the temperature is low as in winter, it is possible to stop the spraying of cooling water in the cooling tower 1 and operate the electric dust collector 10. In this case, spraying in the cooling tower 1 can be performed periodically for cleaning the electrodes of the electrostatic precipitator 10. Moreover, at the time of start-up operation with high temperature as in summer, the electrostatic precipitator 10 is operated while spraying the cooling water in the cooling tower 1. Ice is produced in the cooling means 3 at night when the amount of power is low, and the circulating water is efficiently cooled.
Thus, in this embodiment, since the intake dust collecting device is provided in the front stage of the gas turbine plant, impurities are not attached to the air compressor blades and the gas turbine blades, and the stable operation of the air compressor is achieved. Therefore, the air can be cooled and the density thereof can be increased to maintain the output of the gas turbine high, thereby improving the plant thermal efficiency.

The system of FIG. 5 is a form in which an intake air dust collector is attached to the front stage of the combined cycle power plant of the thermal power plant. The combined cycle power plant is a combination of different cycles that operate in a high temperature region and a low temperature region. As this combined cycle power plant, a configuration of a plant that uses an exhaust reburning type is shown in FIG.
The combined cycle power plant is configured by combining a gas turbine plant with a steam turbine plant and an exhaust heat boiler 55. The gas turbine plant includes an air compressor 50, a gas turbine combustor 51, and a gas turbine 52. The gas (air) sucked by the air compressor 50 is compressed into high-pressure air, and the high-pressure air is supplied to the gas turbine combustor 51 together with fuel. Here, combustion gas is generated, and the combustion gas is caused to perform expansion work by the gas turbine 52. At this time, rotational torque for driving the steam turbine plant is generated.

The exhaust heat boiler 55 usually includes a plurality of heat exchangers 56, generates steam using the gas turbine exhaust gas that has finished expansion work in the gas turbine 52 as a heat source, and supplies the steam to the steam turbine plant.
The steam turbine plant includes a generator 53 and a steam turbine 54 that are directly connected to a turbine shaft of the gas turbine plant, and also includes a condenser 57 and a pump 58. The steam supplied from the heat exchanger 56 of the exhaust heat recovery boiler 55 is expanded by the steam turbine 54 to drive the generator 53. The turbine exhaust that has finished the expansion work in the steam turbine 54 is condensed and condensed in the condenser 57, and is returned to the exhaust heat recovery boiler 55 through the condensate pump 58.

In the system of FIG. 5, similarly to the system of FIG. 4 described above, the air compressor 50 is provided with the intake dust collecting device according to the present invention in the front stage, and in order along the flow of the intake air, the cooling tower 1 having spraying means, An electric dust collector 10 is provided, and a cold heat source (not shown) is provided outside the intake dust collector. Further, the cooling tower 1 has a cooling means 3 such as an ice production tank. Thereby, especially when the temperature in summer is high, the intake air whose specific weight is reduced is cooled, the flow weight is increased, and high output can be maintained even in summer.
Further, in a combined cycle power plant, a large amount of liquefied natural gas (LNG) is usually consumed as fuel used for the gas turbine combustor 51. For this reason, a GT power plant is often installed near the LNG terminal, and the cold energy generated when LNG is gasified can be used. Therefore, by combining with the intake air dust collector of the present invention, the cold heat of LNG can be effectively used as the cold heat source used for the cooling means 3.

  While the embodiments of the present invention have been described above, the present invention can be variously modified and changed based on the technical idea of the present invention.

  The gas turbine intake dust collector of the present invention can be suitably used as an intake device provided in the front stage of a gas turbine power plant. The highly purified intake air avoids a decrease in the output of the gas turbine, damage to the blades, etc., thereby reducing the running cost of the system and improving the gas cooling efficiency. In addition, since waste such as air filters does not come out even if operated for a long period of time, the industrial significance is extremely large as a clean system.

It is a figure which shows the structure of the intake dust collector for gas turbines which concerns on embodiment (the 1) of this invention. It is a figure which shows the structure of the intake dust collector for gas turbines which concerns on embodiment (the 2) of this invention. It is a figure which shows the structure of the intake dust collector for gas turbines which concerns on embodiment (the 3) of this invention. It is a figure which shows schematic structure of the gas turbine electric power generation system incorporating the intake dust collector in Embodiment (the 4) of this invention. It is a figure which shows schematic structure of the combined cycle power generation system incorporating the intake dust collector in Embodiment (the 4) of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cooling tower 2 Cooling heat source 3 Cooling means 6 Circulation pump 7 SS removal device 9 Partition plate 10 Electric dust collector 30 Intake dust collector 50 Air compressor 51 Gas turbine combustor 52 Gas turbine 53 Generator 54 Steam turbine 55 Waste heat Boiler 56 heat exchanger 57 condenser 58 pump

Claims (13)

An intake dust collector for a gas turbine that removes dust after cooling the intake air,
Cooling means connected to a cold heat source to cool water, spraying water cooled by the cooling means to the intake air, spray means, cooling zone for contacting the sprayed water and the intake air, and the cooling An air dust collector for a gas turbine, comprising: an electrostatic precipitator that is provided downstream of the zone and collects and removes components in the intake air that come into contact with water by static electricity.   2. The intake dust collecting apparatus for a gas turbine according to claim 1, wherein the spraying means is provided in an upper part of the cooling tower, and the cooling means is provided in a lower part of the cooling tower.   The intake dust collecting apparatus for a gas turbine according to claim 1 or 2, further comprising a circulation line that collects water sprayed by the spraying means and sprays the water again as circulating water.   The intake dust collecting apparatus for a gas turbine according to claim 3, further comprising a separation unit that separates and collects water sprayed by the spraying unit without passing through the cooling unit.   In addition to the spraying means, a cooling supply line for supplying the circulating water to the cooling means without going through the cooling zone is provided, and the flow rate of circulating water to be sent to the spraying means and the circulation to be sent to the cooling supply line The intake dust collecting apparatus for a gas turbine according to claim 4, further comprising a valve mechanism capable of adjusting a flow rate of water.   6. A temperature measuring device is installed in the circulation line, and the temperature measuring device and the valve mechanism are connected so that the opening / closing degree of the valve can be adjusted by the temperature of the circulating water. An intake dust collector for a gas turbine as described in 1.   The intake dust collector for a gas turbine according to claim 1, wherein a liquid recovery unit is provided at a lower portion of the electric dust collector.   The intake dust collecting apparatus for a gas turbine according to claim 7, further comprising an SS removing device for separating and collecting a solid content in the liquid stored in the liquid collecting section. An intake air dust collection method for removing dust after cooling the intake air at the front stage of the gas turbine,
Water is cooled by cold heat from a cold source, a cooling step, water cooled in the cooling step is sprayed on the intake air, the spraying step, and components in the intake air that have contacted the water are recovered and removed by static electricity. And a dust process.   10. The intake dust collecting method according to claim 9, wherein the water sprayed in the spraying step is recovered through cooling through the cooling step, and is used again in the spraying step as circulating water.   The intake dust collecting method according to claim 10, wherein makeup water cooled through the cooling step is mixed with the circulating water.   The intake dust collection method according to claim 10 or 11, wherein the water sprayed in the spraying step is collected without passing through the cooling step, and is used again in the spraying step as part of the circulating water. .   A gas turbine power generation system, wherein the gas turbine intake dust collecting device according to any one of claims 1 to 8 is installed, and a gas turbine is installed at a subsequent stage of the device.

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