JP2011214476A - Intake air cooling device and operating method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent compression efficiency of a compressor and output of a gas turbine from deteriorating.SOLUTION: An intake air cooling device includes: an intake air cooling coil 11; a mist separator 12; a filter 13; an intake air duct 4 accommodating the intake air cooling coil 11, the mist separator 12 and the filter 13; a return duct 30 communicating an inside of the intake air duct 4 positioned at a downstream side from the filter 13 and an inside of the intake air duct 4 positioned at an upstream side from the filter 13; a recirculation blower 31 provided midway in the return duct 30; a differential manometer 27 measuring difference between pressure near the upstream side of the filter 13 and pressure near the downstream side of the filter 13; and a controller 28 activating the recirculation blower 31 when a measured value measured by the differential manometer 27 is determined to be higher than a predetermined threshold.

Description

  The present invention relates to an intake air cooling device suitable for being applied to a power plant such as a gas turbine plant or a combined cycle plant, and an operation method thereof.

  In a power plant such as a gas turbine plant or a combined cycle plant, air is sucked in from outside and compressed by a compressor that rotates together with the gas turbine, and the compressed air is supplied to the gas turbine to burn the fuel in the combustor. The power is obtained by rotating the gas turbine. The power of the gas turbine is determined according to the pressure and temperature at the turbine inlet. Therefore, when the outside air temperature is high, such as in summer, the air density of the outside air decreases. Therefore, the volume of the air compressed by the compressor is always equal, and the mass of the sucked air decreases. As a result, when the outside air temperature is high, the mass of air supplied to the gas turbine is reduced, and as a result, the power of the gas turbine is reduced.

  In view of this, various intake air cooling devices for lowering the temperature of air taken in from outside air have been provided, and those equipped with an intake air cooling coil (for example, see Patent Document 1) are known.

JP 2000-110586 A

  However, in the one disclosed in Patent Document 1, the condensate adhering to the surface of the intake air cooling coil is scattered downstream along with the intake air that has passed through the intake air cooling coil, and the impurities contained in the condensed water cause gas turbines and compressors. Corrosion and metal deposition may occur.

Therefore, in recent years, a mist separator is disposed downstream of the intake cooling coil and a filter is disposed downstream of the mist separator to prevent the condensed water from scattering downstream along with the intake air that has passed through the intake cooling coil. Intake air cooling devices to be proposed have been proposed.
However, in the intake air cooling device having such a configuration, it is difficult to completely remove the condensed water in the form of mist or liquid from the intake air that has passed through the intake air cooling coil by the mist separator, and is attached to the main filter. Condensed water that has passed through the mist separator adheres to the dust, and the differential pressure (pressure loss) of the filter increases, which may reduce the compression efficiency of the compressor and the output of the gas turbine.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an intake air cooling device and an operation method thereof that can prevent the compression efficiency of the compressor and the output of the gas turbine from being lowered. .

The present invention employs the following means in order to solve the above problems.
An intake air cooling apparatus according to the present invention includes an intake air cooling coil that cools intake air taken in from an intake air inlet by a cooling medium introduced from the outside, and an intake air cooling coil that is disposed downstream of the intake air cooling coil. A mist separator that removes mist-like or liquid condensed water from the intake air that has passed, a filter that is disposed downstream of the mist separator and that removes dust from the intake air that has passed through the mist separator, and the intake cooling coil , The mist separator, and the intake duct that accommodates the filter, the return that communicates the interior of the intake duct that is located downstream of the filter, and the interior of the intake duct that is located upstream of the filter A duct, a recirculation blower provided in the middle of the return duct, and a pressure in the vicinity of the upstream side of the filter A differential pressure gauge that measures the difference between the pressure in the vicinity of the downstream side of the filter, and a control that activates the recirculation blower when it is determined that the measured value measured by the differential pressure gauge is higher than a predetermined threshold value Is provided.

According to the intake air cooling device of the present invention, the measurement value measured by the differential pressure gauge is output to the controller, and is compared with, for example, a threshold value stored (stored) in advance in the controller. It has become. When the measured value measured by the differential pressure gauge becomes higher than the threshold value and it is determined that there is a possibility that condensed water exceeding a specified amount is attached to the filter, the recirculation blower is activated (operated). It is like that. By starting the recirculation blower, when passing through the inside of the intake duct located downstream of the filter, the intake air slightly warmed (about 2 to 4 ° C.), that is, the intake air that has passed through the mist separator. However, the intake air having a high temperature of about 2 to 4 ° C. evaporates the condensed water adhering to the filter.
Thereby, an increase in the differential pressure (pressure loss) in the filter can be suppressed, and the differential pressure (pressure loss) in the filter can be quickly recovered, so that the compression efficiency of the compressor and the output of the gas turbine are reduced. Can be prevented.
Moreover, scattering of the condensed water from the filter to the downstream side can be prevented, and corrosion or metal deposition can be prevented from occurring in the gas turbine or the compressor due to impurities contained in the condensed water.

  In the intake air cooling apparatus, it is further preferable that the controller has a function of stopping the recirculation blower when it is determined that a measured value measured by the differential pressure gauge is lower than a predetermined threshold value. is there.

According to such an intake air cooling device, the measurement value measured by the differential pressure gauge is output to the controller, and is compared with, for example, a threshold value stored (stored) in the controller in advance in the controller. ing. When the measured value measured by the differential pressure gauge becomes lower than the threshold value and it is determined that there is no possibility that condensed water is attached to the filter, the recirculation blower is stopped.
As a result, the intake air cooled by the intake air cooling coil can be supplied to the downstream side without warming (without increasing the temperature of the intake air cooled by the intake air cooling coil).

  An intake air cooling apparatus according to the present invention includes an intake air cooling coil that cools intake air taken in from an intake air inlet by a cooling medium introduced from the outside, and an intake air cooling coil that is disposed downstream of the intake air cooling coil. A mist separator that removes mist-like or liquid condensed water from the intake air that has passed, a filter that is disposed downstream of the mist separator and that removes dust from the intake air that has passed through the mist separator, and the intake cooling coil , The mist separator, and the intake duct that accommodates the filter, the return that communicates the interior of the intake duct that is located downstream of the filter, and the interior of the intake duct that is located upstream of the filter A duct, a recirculation blower provided in the middle of the return duct, and a pressure in the vicinity of the upstream side of the filter A differential pressure gauge that measures the difference between the pressure in the vicinity of the downstream side of the filter, and the rotational speed of the recirculation blower when the measured value measured by the differential pressure gauge is determined to be higher than a predetermined threshold value. And a controller for increasing.

According to the intake air cooling device of the present invention, the measurement value measured by the differential pressure gauge is output to the controller, and is compared with, for example, a threshold value stored (stored) in advance in the controller. It has become. And when it is judged that the measured value measured with the differential pressure gauge becomes higher than the threshold value and there is a possibility that the condensed water exceeding the specified amount is attached to the filter, the rotation speed of the recirculation blower is increased. It is like that. By increasing the rotation speed of the recirculation blower, when passing through the intake duct located downstream of the filter, it passes through the intake air that is slightly warmed (about 2-4 ° C), that is, through the mist separator. The intake air having a temperature of about 2 to 4 ° C. higher than the intake air warms the intake air that has passed through the mist separator, and the intake air that has reached the filter evaporates the condensed water adhering to the filter.
As a result, an increase in the differential pressure (pressure loss) in the filter can be suppressed, and the differential pressure (pressure loss) in the filter can be recovered, so that the compression efficiency of the compressor and the output of the gas turbine are reduced. Can be prevented.
Moreover, scattering of the condensed water from the filter to the downstream side can be prevented, and corrosion or metal deposition can be prevented from occurring in the gas turbine or the compressor due to impurities contained in the condensed water.

  In the intake air cooling device, the controller has a function of decreasing the rotational speed of the recirculation blower when the measured value measured by the differential pressure gauge is determined to be lower than a predetermined threshold value. Further preferred.

According to such an intake air cooling device, the measurement value measured by the differential pressure gauge is output to the controller, and is compared with, for example, a threshold value stored (stored) in the controller in advance in the controller. ing. When the measured value measured by the differential pressure gauge becomes lower than the threshold value and it is determined that there is no possibility that condensed water is attached to the filter, the rotational speed of the recirculation blower can be reduced. Yes.
As a result, the intake air cooled by the intake air cooling coil can be supplied downstream without warming it as much as possible (without increasing the temperature of the intake air cooled by the intake air cooling coil as much as possible).

  In the intake air cooling apparatus, the threshold value is determined according to a load of a gas turbine disposed on the downstream side, an IGV opening amount of a compressor disposed on the downstream side, or a CSO of a gas turbine disposed on the downstream side. More preferably, it is set in accordance with the signal or in accordance with the pressure in the passenger compartment of the gas turbine disposed on the downstream side.

  According to such an intake air cooling device, since the operation according to the load of the gas turbine is performed, the operation in accordance with the actual situation can be performed.

  The power plant according to the present invention includes any one of the above intake air cooling devices.

According to the power plant according to the present invention, an increase in the differential pressure (pressure loss) in the filter can be suppressed, and the differential pressure (pressure loss) in the filter can be recovered. It can prevent that the output of a turbine falls.
Moreover, scattering of the condensed water from the filter to the downstream side can be prevented, and corrosion or metal deposition can be prevented from occurring in the gas turbine or the compressor due to impurities contained in the condensed water.

  An operation method of the intake air cooling device according to the present invention includes an intake air cooling coil that cools intake air taken in from an intake air inlet with a cooling medium introduced from the outside, and an intake air cooling coil that is disposed downstream of the intake air cooling coil. A mist separator that removes mist or liquid condensed water from the intake air that has passed through the cooling coil, a filter that is disposed downstream of the mist separator and that removes dust from the intake air that has passed through the mist separator, and An intake air cooling coil, the mist separator, and an intake duct that accommodates the filter; an interior of the intake duct that is located downstream of the filter; and an interior of the intake duct that is located upstream of the filter. A return duct communicating therewith, a recirculation blower provided in the middle of the return duct, and an upstream side of the filter An intake air cooling apparatus operating method comprising a differential pressure gauge for measuring a difference between a pressure near the downstream side and a pressure in the vicinity of the downstream side of the filter, wherein a measured value measured by the differential pressure gauge is greater than a predetermined threshold value The recirculation blower is started when it is determined that the value is too high.

According to the operation method of the intake air cooling device according to the present invention, when it is determined that the measured value measured by the differential pressure gauge is higher than the threshold value and there is a possibility that condensed water exceeding a specified amount may adhere to the filter. Activates (runs) the recirculating blower. By starting the recirculation blower, when passing through the inside of the intake duct located on the downstream side of the filter, the intake air slightly warmed (about 2-4 ° C.), that is, the intake air that has passed through the mist separator The intake air having a high temperature of about 2 to 4 ° C. evaporates the condensed water adhering to the filter.
Thereby, an increase in the differential pressure (pressure loss) in the filter can be suppressed, and the differential pressure (pressure loss) in the filter can be quickly recovered, so that the compression efficiency of the compressor and the output of the gas turbine are reduced. Can be prevented.
Moreover, scattering of the condensed water from the filter to the downstream side can be prevented, and corrosion or metal deposition can be prevented from occurring in the gas turbine or the compressor due to impurities contained in the condensed water.

  In the operation method of the intake air cooling device, the recirculation blower is stopped when it is determined that the measured value measured by the differential pressure gauge is lower than a predetermined threshold value.

According to such an operation method of the intake air cooling apparatus, when it is determined that the measured value measured by the differential pressure gauge is lower than the threshold value and there is no possibility that condensed water is attached to the filter, the recirculation blower is used. To stop.
As a result, the intake air cooled by the intake air cooling coil can be supplied to the downstream side without warming (without increasing the temperature of the intake air cooled by the intake air cooling coil).

  An operation method of the intake air cooling device according to the present invention includes an intake air cooling coil that cools intake air taken in from an intake air inlet with a cooling medium introduced from the outside, and an intake air cooling coil that is disposed downstream of the intake air cooling coil. A mist separator that removes mist or liquid condensed water from the intake air that has passed through the cooling coil, a filter that is disposed downstream of the mist separator and that removes dust from the intake air that has passed through the mist separator, and An intake air cooling coil, the mist separator, and an intake duct that accommodates the filter; an interior of the intake duct that is located downstream of the filter; and an interior of the intake duct that is located upstream of the filter. A return duct communicating therewith, a recirculation blower provided in the middle of the return duct, and an upstream side of the filter An intake air cooling apparatus operating method comprising a differential pressure gauge for measuring a difference between a pressure near the downstream side and a pressure in the vicinity of the downstream side of the filter, wherein a measured value measured by the differential pressure gauge is greater than a predetermined threshold value When it is determined that the recirculation blower is high, the rotation speed of the recirculation blower is increased.

According to the operation method of the intake air cooling device according to the present invention, when it is determined that the measured value measured by the differential pressure gauge is higher than the threshold value and there is a possibility that condensed water exceeding a specified amount may adhere to the filter. Increases the rotational speed of the recirculation blower. By increasing the rotation speed of the recirculation blower, when passing through the intake duct located downstream of the filter, it passes through the intake air that is slightly warmed (about 2-4 ° C), that is, through the mist separator. The intake air having a temperature of about 2 to 4 ° C. higher than the intake air warms the intake air that has passed through the mist separator, and the intake air that has reached the filter evaporates the condensed water adhering to the filter.
As a result, an increase in the differential pressure (pressure loss) in the filter can be suppressed, and the differential pressure (pressure loss) in the filter can be recovered, so that the compression efficiency of the compressor and the output of the gas turbine are reduced. Can be prevented.
Moreover, scattering of the condensed water from the filter to the downstream side can be prevented, and corrosion or metal deposition can be prevented from occurring in the gas turbine or the compressor due to impurities contained in the condensed water.

  In the operation method of the intake air cooling apparatus, the rotational speed of the recirculation blower is decreased when it is determined that the measured value measured by the differential pressure gauge is lower than a predetermined threshold value.

According to such an operation method of the intake air cooling apparatus, when it is determined that the measured value measured by the differential pressure gauge is lower than the threshold value and there is no possibility that condensed water is attached to the filter, the recirculation blower is used. Reduce the number of revolutions.
As a result, the intake air cooled by the intake air cooling coil can be supplied downstream without warming it as much as possible (without increasing the temperature of the intake air cooled by the intake air cooling coil as much as possible).

  In the operation method of the intake air cooling device, the threshold value is set according to the load balance of the gas turbine disposed on the downstream side, or set according to the IGV opening degree balance of the compressor disposed on the downstream side, Alternatively, it is more preferable that it is set according to the CSO signal match of the gas turbine arranged on the downstream side, or set according to the pressure match in the passenger compartment of the gas turbine arranged on the downstream side.

  According to such an operation method of the intake air cooling apparatus, since the operation is performed in accordance with the load of the gas turbine, the operation that is in reality can be performed.

  The intake air cooling device according to the present invention has an effect that the compression efficiency of the compressor and the output of the gas turbine can be prevented from being lowered.

It is a block diagram which shows the structure of the gas turbine plant provided with the intake air cooling device which concerns on this invention.

Hereinafter, an intake air cooling device and an operation method thereof according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing a configuration of a gas turbine plant equipped with an intake air cooling device according to the present invention.
As shown in FIG. 1, a gas turbine plant (power generation plant) 1 is supplied via an intake duct 4 that leads intake air (outside air: air) taken from an intake inlet 2 to a compressor 3 and the intake duct 4. A compressor 3 that compresses intake air, a combustor 5 that combusts fuel using the intake air supplied from the compressor 3, a gas turbine 6 that is rotated by combustion gas supplied from the combustor 5, and a gas turbine 6 And a generator 7 that generates electric power by rotation.

Further, an intake filter chamber 8 is provided in the middle of the intake duct 4 (in the present embodiment, the upstream (inlet side) end), and the intake air cooling device 10 is provided in the intake filter chamber 8. The prefilter (first stage filter), the intake cooling coil 11, the mist separator 12, and the main filter (second stage filter) 13 (not shown) that are configured are prefiltered, the intake cooling coil 11, the mist separator 12, and the main filter from the upstream side. (Filter) 13 are arranged in this order.
The prefilter removes (relatively large) dust from the intake air taken in from the intake inlet 2, and the intake air cooling coil 11 cools the intake air that has passed through the prefilter.

  The intake duct 4 includes an interior of the intake duct 4 positioned downstream of the main filter 13 (more specifically, an interior of the intake duct 4 positioned between the main filter 13 and a silencer 29 described later), and the main filter A return duct 30 is connected to communicate with the inside of the intake duct 4 located more upstream than 13 (more specifically, the inside of the intake filter chamber 8 located between the mist separator 12 and the main filter 13). A recirculation blower (recirculation blower) 31 is provided in the middle of the return duct 30. When the recirculation blower 31 is operated, a part of the intake air existing inside the intake duct 4 located downstream of the main filter 13 is moved upstream of the main filter 13 via the return duct 30. It is returned to the inside of the intake duct 4 located.

In the intake cooling coil 11, cold circulating water (cooling medium) is supplied from a refrigerator (such as a turbo refrigerator or an absorption refrigerator) 23 via a (first) circulation path 21 and a (first) circulation pump 22. The circulating water that has been supplied with heat and exchanged heat with the intake air (heated by heat exchange with the intake air) is returned to the refrigerator 23 via the circulation path 21. ing.
The chiller 23 is supplied with cold circulating water from the cooling tower 26 via the (second) circulation path 24 and the (second) circulation pump 25. The circulating water that has been heat-exchanged with the circulating water circulating in the water (heated by heat exchange with the circulating water circulating in the circulation path 21) is returned to the cooling tower 26 via the circulation path 24, and again in the cooling tower 26. It is designed to be cooled.

The mist separator 12 is for removing condensed water in the form of mist (or liquid) from the intake air that has passed through the intake air cooling coil 11, and is disposed in the vicinity of the downstream side of the intake air cooling coil 11.
The main filter 13 removes (relatively small) dust that could not be removed by the prefilter from the intake air (humidity (substantially) 100%) that has passed through the mist separator 12. Have the same channel area. Further, in the vicinity of the main filter 13, the difference between the pressure (static pressure or dynamic pressure) near the upstream side of the main filter 13 and the pressure (static pressure or dynamic pressure) near the downstream side of the main filter 13 (that is, static pressure or dynamic pressure). A differential pressure gauge 27 for measuring (measuring) the differential pressure before and after the main filter 13 is provided. Data (measurement result: measured value) measured by the differential pressure gauge 27 is output to the controller 28, and the controller 28 Are compared with a threshold value (database) stored (stored) in the controller 28 in advance. When the data measured by the differential pressure gauge 27 becomes higher than the threshold value (first predetermined value), a control signal (start command) is output from the controller 28 to the recirculation blower 31 and the recirculation blower 31 is started. (Driving).

  When the recirculation blower 31 is started, the intake air slightly warmed (about 2 to 4 ° C.) when passing through the inside of the intake duct 4 located on the downstream side of the main filter 13, that is, the mist separator 12. The intake air whose temperature is about 2 to 4 ° C. higher than that of the intake air that has passed through evaporates the condensed water adhering to the main filter 13. When the condensed water adhering to the main filter 13 evaporates and the data measured by the differential pressure gauge 27 becomes lower than a threshold value (second predetermined value lower than the first predetermined value), the controller 28 A control signal (stop command) is output to the recirculation blower 31 so that the recirculation blower 31 is stopped.

In addition, the code | symbol 29 in FIG. 1 is arrange | positioned in the middle of the intake duct 4 located downstream from the intake filter chamber 8 (in this embodiment, the center part in the longitudinal direction of the intake duct 4), and contains a sound. This silencer suppresses vibration.
Further, the first stage stationary blade of the compressor 3 is an IGV (Inlet Guide Vane) whose opening degree can be changed.

According to the intake air cooling device 10 and the operation method thereof according to the present embodiment, the measurement value measured by the differential pressure gauge 27 is output to the controller 28, and is stored (stored) in the controller 28 in advance in the controller 28. It is compared with the threshold value. If the measured value measured by the differential pressure gauge 27 becomes higher than the threshold value and it is determined that condensed water exceeding a specified amount may adhere to the main filter 13, the recirculation blower 31 is activated ( Driving). When the recirculation blower 31 is started, the intake air slightly warmed (about 2 to 4 ° C.) when passing through the inside of the intake duct 4 located on the downstream side of the main filter 13, that is, the mist separator 12. The intake air having a temperature higher by about 2 to 4 ° C. than the intake air that has passed through the air evaporates the condensed water adhering to the main filter 13.
Thereby, an increase in the differential pressure (pressure loss) in the main filter 13 can be suppressed, and the differential pressure (pressure loss) in the main filter 13 can be quickly recovered, so that the compression efficiency of the compressor and the gas turbine It is possible to prevent the output from decreasing.
In addition, scattering of condensed water from the main filter 13 to the downstream side can be prevented, and corrosion and metal deposition can be prevented from occurring in the gas turbine 6 and the compressor 3 due to impurities contained in the condensed water. it can.

Further, according to the intake air cooling device 10 and the operation method thereof according to the present embodiment, the measurement value measured by the differential pressure gauge 27 is output to the controller 28, and is stored (stored) in the controller 28 in advance in the controller 28. ) Is compared with the threshold value. When the measurement value measured by the differential pressure gauge 27 becomes lower than the threshold value and it is determined that there is no possibility that condensed water is attached to the main filter 13, the recirculation blower 31 is stopped. ing.
As a result, the intake air cooled by the intake air cooling coil 11 can be supplied downstream without warming (without increasing the temperature of the intake air cooled by the intake air cooling coil 11).

Furthermore, according to the intake air cooling device 10 and the operation method thereof according to the present embodiment, the mist separator 12 removes the condensed water that is in the form of mist or liquid from the intake air that has passed through the intake air cooling coil 11. Further, even when the condensed water that has become mist or liquid from the intake air cannot be completely removed by the mist separator 12, the condensed water that has passed through the mist separator 12 adheres to the dust that has adhered to the main filter 13. Thus, the condensed water in the form of mist or liquid is removed from the intake air that has passed through the mist separator 12.
As a result, it is possible to prevent the condensed water from being scattered downstream along with the intake air that has passed through the intake cooling coil 11, and corrosion or metal deposition occurs in the gas turbine 6 or the compressor 3 due to impurities contained in the condensed water. Can be prevented.

An intake air cooling device and an operation method thereof according to a second embodiment of the present invention will be described with reference to FIG.
The intake air cooling device according to the present embodiment adjusts (increases or decreases) the rotational speed of the recirculation blower 31 based on the data measured by the differential pressure gauge 27 instead of starting and stopping the recirculation blower 31. This differs from that of the first embodiment described above.
That is, in this embodiment, when the data measured by the differential pressure gauge 27 becomes higher than the threshold value (first predetermined value), a control signal (control command) is output from the controller 28 to the recirculation blower 31, When the circulation blower 31 is increased to a predetermined rotational speed (for example, a rated rotational speed) and the data measured by the differential pressure gauge 27 becomes lower than a threshold value (second predetermined value lower than the first predetermined value). A control signal (control command) is output from the controller 28 to the recirculation blower 31 so that the recirculation blower 31 is reduced to a predetermined rotational speed (for example, 20% of the rated rotational speed).

  When the rotation speed of the recirculation blower 31 is increased, the intake air slightly warmed (about 2 to 4 ° C.) when passing through the inside of the intake duct 4 located on the downstream side of the main filter 13, that is, The intake air having a temperature of about 2 to 4 ° C. higher than the intake air that has passed through the mist separator 12 warms the intake air that has passed through the mist separator 12, and the intake air that has reached the main filter 13 evaporates the condensed water adhering to the main filter 13. . When the condensed water adhering to the main filter 13 evaporates and the data measured by the differential pressure gauge 27 becomes lower than a threshold value (second predetermined value lower than the first predetermined value), the controller 28 A control signal (control command) is output to the recirculation blower 31 so that the rotational speed of the recirculation blower 31 is reduced.

According to the intake air cooling device and the operation method thereof according to the present embodiment, the measurement value measured by the differential pressure gauge 27 is output to the controller 28 and is stored (stored) in the controller 28 in advance in the controller 28. It is compared with a threshold value. When the measured value measured by the differential pressure gauge 27 is higher than the threshold value and it is determined that there is a possibility that condensed water exceeding a specified amount is attached to the main filter 13, the rotational speed of the recirculation blower 31. Can be increased. When the rotation speed of the recirculation blower 31 is increased, the intake air slightly warmed (about 2 to 4 ° C.) when passing through the inside of the intake duct 4 located on the downstream side of the main filter 13, that is, The intake air having a temperature of about 2 to 4 ° C. higher than the intake air that has passed through the mist separator 12 warms the intake air that has passed through the mist separator 12, and the intake air that has reached the main filter 13 evaporates the condensed water adhering to the main filter 13. It will be.
Thereby, an increase in the differential pressure (pressure loss) in the main filter 13 can be suppressed, and the differential pressure (pressure loss) in the main filter 13 can be recovered, so that the compression efficiency of the compressor and the output of the gas turbine can be recovered. Can be prevented from decreasing.
In addition, scattering of condensed water from the main filter 13 to the downstream side can be prevented, and corrosion and metal deposition can be prevented from occurring in the gas turbine 6 and the compressor 3 due to impurities contained in the condensed water. it can.

In addition, according to the intake air cooling apparatus and the operation method thereof according to the present embodiment, the measurement value measured by the differential pressure gauge 27 is output to the controller 28, and is stored (stored) in the controller 28 in advance in the controller 28. It is compared with the set threshold value. When the measured value measured by the differential pressure gauge 27 becomes lower than the threshold value and it is determined that there is no possibility that condensed water adheres to the main filter 13, the rotational speed of the recirculation blower 31 is decreased. It is like that.
Thus, the intake air cooled by the intake air cooling coil 11 can be supplied downstream without warming it as much as possible (without increasing the temperature of the intake air cooled by the intake air cooling coil 11 as much as possible).

Furthermore, according to the intake air cooling device and the operating method thereof according to the present embodiment, the mist separator 12 removes the condensed water that is in the form of mist or liquid from the intake air that has passed through the intake air cooling coil 11. Further, even when the condensed water that has become mist or liquid from the intake air cannot be completely removed by the mist separator 12, the condensed water that has passed through the mist separator 12 adheres to the dust that has adhered to the main filter 13. Thus, the condensed water in the form of mist or liquid is removed from the intake air that has passed through the mist separator 12.
As a result, it is possible to prevent the condensed water from being scattered downstream along with the intake air that has passed through the intake cooling coil 11, and corrosion or metal deposition occurs in the gas turbine 6 or the compressor 3 due to impurities contained in the condensed water. Can be prevented.

An intake air cooling device and an operation method thereof according to a third embodiment of the present invention will be described with reference to FIG.
The intake air cooling device according to the present embodiment decreases the threshold value for starting the recirculation blower 31, the threshold value for stopping the recirculation blower 31, the threshold value for increasing the rotation speed of the recirculation blower 31, and the rotation speed of the recirculation blower 31. The threshold is different from that of the above-described embodiment in that the threshold is set (determined) according to the load (load state) of the gas turbine 6 (based on the load (load state) of the gas turbine 6).
That is, in the present embodiment, when the load of the gas turbine 6 is high, the threshold value set higher increases the rotational speed of the recirculation blower 31 when the recirculation blower 31 is started and when the recirculation blower 31 is stopped. When increasing, the recirculation blower 31 is selected (adopted) to decrease the rotation speed, and when the load of the gas turbine 6 is low, a lower threshold is set for recirculation when the recirculation blower 31 is activated. When the blower 31 is stopped, it is selected (adopted) when the rotation speed of the recirculation blower 31 is increased or when the rotation speed of the recirculation blower 31 is decreased.

According to the intake air cooling device and the operation method thereof according to the present embodiment, the operation in accordance with the load of the gas turbine 6 is performed, so that the operation that is in reality can be performed.
Other functions and effects are the same as those of the first embodiment or the second embodiment described above, and thus the description thereof is omitted here.

An intake air cooling device and an operation method thereof according to a fourth embodiment of the present invention will be described with reference to FIG.
The intake air cooling device according to the present embodiment decreases the threshold value for starting the recirculation blower 31, the threshold value for stopping the recirculation blower 31, the threshold value for increasing the rotation speed of the recirculation blower 31, and the rotation speed of the recirculation blower 31. The embodiment described above in that the threshold is set (determined) according to the IGV opening (opening state) of the compressor 3 (based on the IGV opening (opening state) of the compressor 3). And different.
That is, in the present embodiment, when the IGV opening of the compressor 3 is large, the threshold value set higher is the rotation of the recirculation blower 31 when the recirculation blower 31 is started and when the recirculation blower 31 is stopped. When increasing the number, it is selected (adopted) when decreasing the rotation speed of the recirculation blower 31, and when the IGV opening of the compressor 3 is small, a lower threshold value activates the recirculation blower 31. At this time, when the recirculation blower 31 is stopped, when the rotation speed of the recirculation blower 31 is increased, it is selected (adopted) when the rotation speed of the recirculation blower 31 is decreased.

According to the intake air cooling device and the operation method thereof according to the present embodiment, the operation in accordance with the load of the gas turbine 6 is performed, so that the operation that is in reality can be performed.
Other functions and effects are the same as those of the first embodiment or the second embodiment described above, and thus the description thereof is omitted here.

An intake air cooling device and an operation method thereof according to a fifth embodiment of the present invention will be described with reference to FIG.
The intake air cooling device according to the present embodiment decreases the threshold value for starting the recirculation blower 31, the threshold value for stopping the recirculation blower 31, the threshold value for increasing the rotation speed of the recirculation blower 31, and the rotation speed of the recirculation blower 31. The threshold value is different from that of the above-described embodiment in that the threshold value is set (determined) in accordance with the CSO (Control Signal Output) signal of the gas turbine 6 (based on the CSO signal of the gas turbine 6).
That is, in the present embodiment, when the fuel flow rate of the gas turbine 6 is large, the threshold value set higher is the number of rotations of the recirculation blower 31 when the recirculation blower 31 is started and when the recirculation blower 31 is stopped. Is selected (adopted) when the rotational speed of the recirculation blower 31 is decreased, and when the fuel flow rate of the gas turbine 6 is small, a lower threshold is set when the recirculation blower 31 is activated. When the recirculation blower 31 is stopped, it is selected (adopted) when the rotation speed of the recirculation blower 31 is increased or when the rotation speed of the recirculation blower 31 is decreased.

According to the intake air cooling device and the operation method thereof according to the present embodiment, the operation in accordance with the load of the gas turbine 6 is performed, so that the operation that is in reality can be performed.
Other functions and effects are the same as those of the first embodiment or the second embodiment described above, and thus the description thereof is omitted here.

An intake air cooling device and an operation method thereof according to a sixth embodiment of the present invention will be described with reference to FIG.
The intake air cooling device according to the present embodiment decreases the threshold value for starting the recirculation blower 31, the threshold value for stopping the recirculation blower 31, the threshold value for increasing the rotation speed of the recirculation blower 31, and the rotation speed of the recirculation blower 31. The threshold is different from that of the above-described embodiment in that the threshold is set (determined) according to the pressure in the passenger compartment of the gas turbine 6 (based on the pressure in the passenger compartment of the gas turbine 6).
That is, in this embodiment, when the pressure in the passenger compartment of the gas turbine 6 is high, the threshold value set higher is set when the recirculation blower 31 is started, when the recirculation blower 31 is stopped, When increasing the rotation speed, it is selected (adopted) when decreasing the rotation speed of the recirculation blower 31, and when the pressure in the passenger compartment of the gas turbine 6 is low, a lower threshold is set for the recirculation blower 31. When starting up, when stopping the recirculation blower 31, when increasing the rotation speed of the recirculation blower 31, it is selected (adopted) when decreasing the rotation speed of the recirculation blower 31.

According to the intake air cooling device and the operation method thereof according to the present embodiment, the operation in accordance with the load of the gas turbine 6 is performed, so that the operation that is in reality can be performed.
Other functions and effects are the same as those of the first embodiment or the second embodiment described above, and thus the description thereof is omitted here.

The present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the gist of the present invention.
For example, in the above-described embodiment, it is more preferable that the intake cooling coil 11 and the mist separator 12 are configured to be detachable from the intake duct 4 (or the intake filter chamber 8).
Thereby, at the time when it is not necessary to cool the intake air (for example, in winter), the intake cooling coil 11 and the mist separator 12 can be easily removed, and the pressure loss due to the intake cooling coil 11 and the mist separator 12 is eliminated ( And the compression efficiency of the compressor 3 and the output of the gas turbine 6 can be improved.

1 Gas turbine plant (power plant)
2 Intake Inlet 3 Compressor 4 Intake Duct 6 Gas Turbine 10 Intake Cooling Device 11 Intake Cooling Coil 12 Mist Separator 13 Main Filter (Filter)
27 Differential pressure gauge 28 Controller 30 Return duct 31 Recirculation blower

Claims (17)

An intake air cooling coil that cools intake air taken in from the intake air inlet by an externally introduced cooling medium;
A mist separator disposed on the downstream side of the intake air cooling coil for removing condensed water in a mist or liquid form from the intake air that has passed through the intake air cooling coil;
A filter that is disposed downstream of the mist separator and removes dust from the intake air that has passed through the mist separator;
An intake duct that houses the intake cooling coil, the mist separator, and the filter;
A return duct communicating with the inside of the intake duct located on the downstream side of the filter and the inside of the intake duct located on the upstream side of the filter;
A recirculation blower provided in the middle of the return duct;
A differential pressure gauge that measures the difference between the pressure near the upstream side of the filter and the pressure near the downstream side of the filter;
An intake air cooling apparatus, comprising: a controller that activates the recirculation blower when it is determined that a measured value measured by the differential pressure gauge is higher than a predetermined threshold value.   2. The intake air cooling apparatus according to claim 1, wherein the controller stops the recirculation blower when it is determined that a measured value measured by the differential pressure gauge is lower than a predetermined threshold value. An intake air cooling coil that cools intake air taken in from the intake air inlet by an externally introduced cooling medium;
A mist separator disposed on the downstream side of the intake air cooling coil for removing condensed water in a mist or liquid form from the intake air that has passed through the intake air cooling coil;
A filter that is disposed downstream of the mist separator and removes dust from the intake air that has passed through the mist separator;
An intake duct that houses the intake cooling coil, the mist separator, and the filter;
A return duct communicating with the inside of the intake duct located on the downstream side of the filter and the inside of the intake duct located on the upstream side of the filter;
A recirculation blower provided in the middle of the return duct;
A differential pressure gauge that measures the difference between the pressure near the upstream side of the filter and the pressure near the downstream side of the filter;
An intake air cooling apparatus, comprising: a controller that increases the rotation speed of the recirculation blower when it is determined that a measured value measured by the differential pressure gauge is higher than a predetermined threshold value.   4. The intake air according to claim 3, wherein the controller reduces the rotational speed of the recirculation blower when the measured value measured by the differential pressure gauge is determined to be lower than a predetermined threshold value. 5. Cooling system.   The intake air cooling device according to any one of claims 1 to 4, wherein the threshold value is set in accordance with a load balance of a gas turbine disposed on the downstream side.   The intake air cooling device according to any one of claims 1 to 4, wherein the threshold value is set in accordance with an IGV opening degree of a compressor disposed on the downstream side.   The intake air cooling device according to any one of claims 1 to 4, wherein the threshold value is set in accordance with a CSO signal of a gas turbine disposed on the downstream side.   The intake air cooling apparatus according to any one of claims 1 to 4, wherein the threshold value is set according to a pressure commensurate with a cabin of a gas turbine disposed on the downstream side.   A power plant comprising the intake air cooling device according to any one of claims 1 to 8. An intake air cooling coil that cools intake air taken in from the intake air inlet by an externally introduced cooling medium;
A mist separator disposed on the downstream side of the intake air cooling coil for removing condensed water in a mist or liquid form from the intake air that has passed through the intake air cooling coil;
A filter that is disposed downstream of the mist separator and removes dust from the intake air that has passed through the mist separator;
An intake duct that houses the intake cooling coil, the mist separator, and the filter;
A return duct communicating with the inside of the intake duct located on the downstream side of the filter and the inside of the intake duct located on the upstream side of the filter;
A recirculation blower provided in the middle of the return duct;
An operation method of an intake air cooling apparatus comprising a differential pressure gauge for measuring a difference between a pressure in the vicinity of the upstream side of the filter and a pressure in the vicinity of the downstream side of the filter,
A method of operating an intake air cooling apparatus, wherein the recirculation blower is activated when it is determined that a measured value measured by the differential pressure gauge is higher than a predetermined threshold value.   The method of operating an intake air cooling apparatus according to claim 10, wherein the recirculation blower is stopped when it is determined that a measured value measured by the differential pressure gauge is lower than a predetermined threshold value. . An intake air cooling coil that cools intake air taken in from the intake air inlet by an externally introduced cooling medium;
A mist separator disposed on the downstream side of the intake air cooling coil for removing condensed water in a mist or liquid form from the intake air that has passed through the intake air cooling coil;
A filter that is disposed downstream of the mist separator and removes dust from the intake air that has passed through the mist separator;
An intake duct that houses the intake cooling coil, the mist separator, and the filter;
A return duct communicating with the inside of the intake duct located on the downstream side of the filter and the inside of the intake duct located on the upstream side of the filter;
A recirculation blower provided in the middle of the return duct;
An operation method of an intake air cooling apparatus comprising a differential pressure gauge for measuring a difference between a pressure in the vicinity of the upstream side of the filter and a pressure in the vicinity of the downstream side of the filter,
A method of operating an intake air cooling apparatus, wherein the rotational speed of the recirculation blower is increased when it is determined that a measurement value measured by the differential pressure gauge is higher than a predetermined threshold value.   13. The intake air cooling device according to claim 12, wherein when it is determined that a measured value measured by the differential pressure gauge is lower than a predetermined threshold value, the rotational speed of the recirculation blower is decreased. Driving method.   The operating method of the intake air cooling apparatus according to any one of claims 10 to 13, wherein the threshold value is set in accordance with a load balance of a gas turbine disposed on the downstream side.   The operating method of the intake air cooling device according to any one of claims 10 to 13, wherein the threshold value is set in accordance with an IGV opening degree of a compressor arranged on the downstream side.   The operating method of the intake air cooling apparatus according to any one of claims 10 to 13, wherein the threshold value is set in accordance with a CSO signal of a gas turbine disposed on the downstream side.   The method of operating an intake air cooling apparatus according to any one of claims 10 to 13, wherein the threshold value is set according to a pressure commensurate with a pressure in a passenger compartment of a gas turbine disposed on the downstream side.

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