JPH1136887A - Intake air cooler for gas turbine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a compact configuration and to lengthen the life of an intake air filter by improving heat transfer efficiency by heat transfer tubes and heightening collecting efficiency of fine particles by a drain drops, and to facilitate application to the existing gas turbine facilities by improving the piping configuration of heat transfer tubes and to improve intake efficiency by raising the removing efficiency of fine particles in the intake air simultaneously. SOLUTION: In an intake air cooler 2 which is installed on an intake air route of a gas turbine and is equipped with many heat transfer tubes to cool intake air by heat exchange, trays 21 to receive drains generated by air cooling air installed below heat transfer tubes. The trays 21 are constructed to have drain slope to descend toward downstream side of intake air. This structure brings intake air into contact with drains uniformly, to improve collecting efficiency of fine particles, to perform auxiliary dust-proofing effect of an intake air filter effectively, and to lengthen of the filter life and to make configuration compact.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas turbine intake cooler installed at a gas turbine intake port of a gas turbine power plant or the like for cooling intake air. The present invention relates to a gas turbine intake air cooler having an improved dust collecting function and the like.

[0002]

2. Description of the Related Art In a gas turbine power plant or the like, air compressed by a compressor is mixed with fuel to form gas fuel, and this gas fuel is injected into a liner of a combustor and burned.
Thereby, high-temperature combustion gas is supplied to the gas turbine to obtain a driving force. Therefore, in the case of gas fuel containing air, air becomes a part of the energy for combustion. Therefore, in order to increase the turbine output, it is desirable to use the air with a large specific weight of the air.

As is well known, the lower the temperature, the higher the specific weight of the air. Therefore, it is desirable that the air used for the gas turbine intake be low in temperature, especially in summer or the like to be supplied as low-temperature air by cooling with an intake cooling device. It is desired.

FIG. 6 is a graph showing the relationship between the intake air temperature and the gas turbine output. As shown by the characteristic line T in the figure, it can be seen that the lower the intake air temperature, the higher the gas turbine output.

For this reason, conventionally, an intake air cooler is installed in the intake passage of a gas turbine, and FIG. 7 shows an example of a gas turbine configuration having such an intake air cooler.

That is, in the example shown in FIG. 7, an intake air cooler 2 is provided at an intake air intake 1 at the most upstream side of an intake passage, and a damper chamber 3, an intake filter chamber 4, an intake filter Ducts 5 are sequentially connected so that the cooled air is guided to the inlet of the compressor 7 of the gas turbine 6.

The intake air cooler 2 has a configuration in which a heat transfer tube group 9 composed of a large number of heat transfer tubes 8 for heat exchange is arranged, and a cooling medium flowing in the heat transfer tubes 8 and an outer surface of the heat transfer tubes 8 are provided. Inlet cooling is performed by heat exchange with the suction air 10 in contact. Below the intake air cooler 2, a drain discharge pipe 11 for discharging drain generated by condensation of moisture in the air is provided.

[0008] A plurality of openable and closable dampers 12 are provided in the damper chamber 3 so as to change the air flow when the turbine is operating and when it is stopped. In addition, an intake filter 13 is provided in the intake filter chamber 4 so as to remove dust contained in the intake air and supply it to the inlet of the compressor 7 of the gas turbine 6 as clean air 10a.

FIG. 8 shows a system configuration of a refrigeration cycle in the intake air cooler 2 shown in FIG. That is, a closed cycle is constituted by the cooling medium pipe 14, and a heat exchanger 15 for cooling medium cooling, a pump 16 for circulating cooling medium, and a heat transfer pipe 8 for cooling intake air are sequentially provided in the cooling medium pipe 14. It is connected to the. The cooling medium 17
After heat exchange with the suction air in the heat transfer tube 8, the heat exchanger 1
5, and is again guided by the pump 16 to the heat transfer tube 8 of the intake air cooler 2 and circulated.

FIG. 9 is an enlarged view of the configuration of the heat transfer tube section described above. A number of fins 18 are provided around the heat transfer tube 8 to protrude integrally to increase the heat exchange efficiency.

FIG. 10 schematically shows a state in which heat is exchanged between the cooling medium 17 and the suction air 10 by the heat transfer tube 8. As shown in FIG.
As a result, the temperature of the suction air 10 decreases, and the moisture in the suction air 10 condenses on the outer surface of the heat transfer tube 8, and a drain 19 is generated on the surface of the heat transfer tube 8. The drain 19 flows down as droplets, accumulates in the lower part of the intake air cooler 2, and is discharged from the drain discharge pipe 11.

The intake air is supplied to the intake filter 13.
The air is supplied to the gas turbine 6 as clean air 10a to prevent a decrease in turbine efficiency. However, the intake filter 13 continuously collects dust during operation of the gas turbine. , The pressure loss of the intake filter 13 increases due to the accumulation of the collected dust.

FIG. 11 shows a state in which the pressure loss increases. As shown by a characteristic line P in FIG.
The pressure loss of the intake filter 13 increases temporarily with the operation time of the gas turbine, and after a certain time, the pressure loss sharply increases. This causes a decrease in the output of the gas turbine, and at the time of such a rapid rise, the intake filter reaches its replacement life.

The pressure loss due to the intake filter 13 further increases as the total pressure loss of the entire intake system. Therefore, the performance of the intake filter 13 is such that the dust collection efficiency does not decrease and the pressure loss does not increase. However, this is unfavorable because it increases the cost ratio of the intake equipment to the entire equipment.

On the other hand, the heat transfer tubes 8
A phenomenon occurs in which the condensed drain 19 generated in the step is scattered as droplets. The drain droplets fall below the air cooler 2 while being in contact with the suction air, and at this time come into contact with the dust in the suction air, so that the function of collecting dust is exhibited. This indirectly means that the intake filter 13
However, in the conventional configuration, the scattering phenomenon of the drain droplets is not uniform, the dust collection efficiency is low due to the low droplet distribution density, and the life of the intake filter 13 is extended. Is relatively small.

Further, in the structure of the heat transfer tube group 9 in which the heat transfer tubes 8 are arranged in a multilayered manner, the drain droplets generated in the upper heat transfer tubes 8 fall, adhere to the surface of the lower heat transfer tubes 8 and adhere thereto. Since the heat transfer tube is covered, a thick drain film is generated between the suction air 10 and the heat transfer tube 8. When such a drain film is generated, the heat transfer coefficient on the surface of the heat transfer tube 8 decreases, and the heat transfer efficiency decreases.

FIG. 12 shows a configuration example of another conventional gas turbine provided with an intake air cooler. This figure 1
2, the intake air cooler 2 in which the heat transfer tubes 8 are disposed
Downstream of the intake filter chamber 4 and the intake silencer 20
Are sequentially provided, and a concrete duct 20a is further provided downstream thereof, and is connected to the compressor 7 of the gas turbine 6.

When such a configuration for cooling the intake air is applied to an existing gas turbine facility (not shown) having no intake air cooler, a heat transfer tube group is installed at the intake air intake. . However, despite the fact that a large space is required for the suction air intake for the installation of the heat transfer tube group, many of the existing gas turbine facilities often do not have a large space for the suction air intake, It is often difficult to apply an intake air cooler.

[0019]

As described above, in the structure of the conventional gas turbine intake air cooler, the pressure loss of the intake filter tends to increase as the operation is continued. There was a problem that equipment cost increased.

On the other hand, the condensed drain generated in the heat transfer tube of the intake air cooler comes into contact with the dust in the air and brings about the action of collecting the dust, which indirectly contributes to prolonging the life of the intake filter. However, in the conventional configuration, there is a problem that the scattering phenomenon of the drain droplets is non-uniform and the droplet distribution density is low, so that the dust collecting efficiency is poor, and the contribution to prolonging the life of the intake filter is relatively small.

Further, in the tube group structure of the heat transfer tubes superposed in multiple layers, the drain droplets generated from the upper heat transfer tubes fall downward, and the drain droplets flow on the surface of the lower heat transfer tubes to cover the heat transfer tubes. As a result, a thick drain film is generated between the suction air and the heat transfer tube, and the heat transfer coefficient on the surface of the heat transfer tube is reduced, and the heat transfer efficiency is reduced.

Further, when an intake air cooler is applied to an existing gas turbine facility, there is a problem that a wide installation space cannot be taken in an intake air intake port, which makes application difficult.

The present invention has been made in view of such circumstances, and a first object of the present invention is to improve the heat transfer efficiency of a heat transfer tube and to improve the efficiency of collecting dust by drain droplets. An object of the present invention is to provide a gas turbine intake air cooler that can be made compact and extend the life of an intake filter.

A second object of the present invention is to improve the arrangement of the heat transfer tubes to facilitate application to existing gas turbine equipment, and at the same time, to improve the efficiency of removing dust from the intake air to improve the intake efficiency. Another object of the present invention is to provide a gas turbine intake air cooler capable of improving the temperature.

[0025]

In order to achieve the above object, according to the first aspect of the present invention, an intake cooling system is provided in an intake passage of a gas turbine and has a plurality of heat transfer tubes for cooling intake air by heat exchange. A gas turbine, wherein a tray for receiving a drain generated by air cooling is provided below the heat transfer tube, and the tray has a drain gradient descending toward the downstream side of the suction air. Provide an intake air cooler.

According to a second aspect of the present invention, in the gas turbine intake air cooler according to the first aspect, a plurality of slits for uniformly dispersing the drain as droplets are provided at the edge of the tray located on the downstream side of the intake air. A gas turbine intake air cooler characterized by being provided.

According to a third aspect of the present invention, in the gas turbine intake air cooler according to the first or second aspect, a drain recovery section for recovering drain dripping from an edge of the tray, and a drain recovery section connected to the drain recovery section for recovery. A drain supply pipe for feeding the drain to the heat transfer pipe section, and a nozzle for spraying the drain provided at the tip of the drain supply pipe and bringing the drain into contact with the suction air at the heat transfer pipe section. A gas turbine inlet cooler is provided.

According to a fourth aspect of the present invention, in the intake air cooler provided in the intake passage of the gas turbine and having a plurality of heat transfer tubes for cooling the suction air by heat exchange, the heat transfer tubes are located downstream of the suction air purification filter. A gas turbine intake cooler is provided in a concrete duct provided on the side.

According to a fifth aspect of the present invention, in the gas turbine intake air cooler according to the fourth aspect, a drain recovery section for recovering drain dripped from the heat transfer tube, and a drain connected to the drain recovery section for passing the recovered drain to the intake passage. A gas turbine comprising: a drain supply pipe for feeding the filter upstream of the filter; and a nozzle for spraying the drain provided at a tip end of the drain supply pipe and bringing the drain into contact with suction air upstream of the filter. Provide an intake air cooler.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a gas turbine intake air cooler according to the present invention will be described below with reference to FIGS. In the configuration of the intake system of the entire gas turbine,
7 and FIG. 12 are referred to as to the same parts as in the related art, and redundant description will be omitted.

First Embodiment (FIGS. 1, 2, and 7) FIG. 1 is a view showing a configuration of an intake air cooler showing a configuration of a first embodiment of the present invention, and FIG. It is an enlarged view which shows a structure of.

In this embodiment, as shown in FIGS. 1 and 2, a plurality of trays 21 for receiving drain water are provided below a group of vertically arranged heat transfer tubes 8 in the group of heat transfer tubes 9 on the downstream side. Are arranged with a drain gradient that gradually decreases toward. Other configurations are the same as the conventional configuration shown in FIG.

According to such a configuration, the intake air 10
Passes through the heat transfer tube 8 installed inside the intake air cooler 2, is cooled here, and then enters the damper chamber 3. Further, the condensed drain 19 is generated on the surface of the heat transfer tube 8 due to the cooling of the intake air 10 and flows down as droplets.

Since the drain collecting tray 21 is provided below the heat transfer tube 8, the droplet of the drain 19 generated on the outer peripheral surface of the heat transfer tube 8 is collected. And the tray 21
Drain flows downstream of the suction air due to the gradient of
From the downstream end side of the tray 21, it falls as a drain droplet 19a.

According to the present embodiment, since the drain collecting tray 21 is provided below the heat transfer tube 8, all the drain 19 generated in the heat transfer tube 8 above the tray 21 is collected, and the drain 21 below the tray 21 is collected. The drain 19 generated in the upper heat transfer tube 8 does not contact the heat transfer tube 8. Therefore, the drain film that inhibits heat transfer on the surface of the heat transfer tube 8 is prevented from being excessively thick, and heat transfer on the heat transfer tube surface can be promoted and improved as compared with the case where the tray 21 is not installed. it can.

Second Embodiment (FIGS. 3 and 7) FIG. 3 is an enlarged view showing a configuration of a heat transfer tube part according to a second embodiment of the present invention.

In this embodiment, similarly to the first embodiment, a drain collecting tray 21 is provided. This tray 2
A plurality of slits 22 are provided at equal intervals in a portion where the drain droplet 19a flows down at the downstream end of one. As a result, the drain 1 collected on the drain collection tray 21 is removed.
Numerals 9 fall into the lower part of the intake air cooler 2 as drain droplets 19a from slits 22 provided at equal intervals.

According to the present embodiment, the drain droplets 19a are uniformly distributed from the slits 22 at equal intervals into the suction air flow path. As a result, the dust contained in the suction air 10 and the scattered drain droplets 19a uniformly contact each other,
The drain droplet 19a performs the function of taking in dust. Then, the drain droplets 19a that have taken in the dust fall to the lower part of the intake air cooler 2 and are discharged to the outside of the intake air cooler 2 by the drainage pipe 11, as in the first embodiment.

As compared with the conventional configuration in which a tray is not provided, the density of the droplets that fall can be increased, so that the dust collecting effect can be enhanced as compared with the conventional configuration. Further, compared with the case of the first embodiment, the drain droplets 19a can be more evenly sprayed into the suction air 10, and the advantage of keeping the dust collecting effect constant can be obtained.

By the above operation, the dust concentration in the intake air 10 can be reduced, whereby the same function as the intake filter can be obtained, and the dust collection of the intake filter 13 installed on the downstream side can be performed. By reducing the amount,
An increase in pressure loss of the intake filter 13 can be suppressed, which can contribute to a longer filter replacement life.

Third Embodiment (FIGS. 4 and 7) FIG. 4 is a configuration diagram of an intake device showing a configuration of a third embodiment of the present invention.

In this embodiment, in addition to the second embodiment, a drain recovery pipe 23, a pump 24, a water supply pipe 25, and a drain pipe 26 are provided outside the intake air cooler 2.
The water supply pipe 25 is guided to the uppermost part in the intake air cooler 2, branches off at the tip end side, and re-sprays the drain from nozzles 27 arranged at equal intervals downstream of the suction air of the heat transfer tube group 9. I have. Further, a flow control valve 28 for adjusting the amount of drain water is provided in the water supply pipe 25, and a drain adjustment valve 29 for adjusting the amount of drain water is provided in the drain pipe 2.
6 is installed.

According to the present embodiment, the drain collected in the lowermost part of the intake air cooler 2 is recovered by the drain recovery pipe 23 and is pressurized by the pump 24. Then, water supply pipe 2
5 and a drain pipe 26, and on the water supply pipe 25 side, the drain 19 b is injected again from the nozzle 27 disposed downstream of the suction air 10 of the heat transfer pipe group 9 of the intake air cooler 2.

As a result, the distribution density of the drain droplets can be further increased as compared with the second embodiment, and the contact between the dust contained in the suction air 10 and the drain droplets can be increased. The efficiency of collecting dust by droplets can be improved.

In the second embodiment, the suction air 10 passing through the heat transfer tube 8 installed at the top of the intake air cooler 2
Flows into the downstream damper chamber 3 without contacting the drain droplets 19a flowing down from the tray 21, so that dust passes without being collected by the drain droplets 19a. Drain droplet 1 ejected from 27
9b, the suction air 1 passing through the uppermost heat transfer tube 8
Since the dust in 0 is also collected, the collection effect can be further enhanced.

Fourth Embodiment (FIGS. 5 and 12) FIG. 5 is a block diagram showing a fourth embodiment of the present invention.
2 shows an improvement of the conventional configuration shown in FIG.

In this embodiment, as shown in FIG. 5, a heat transfer pipe 8 is installed in the concrete duct 20a downstream of the intake silencer, and heat is exchanged by the heat transfer pipe 8 to cool the intake air 10. Has become. Condensed water generated by cooling the intake air 10 by the heat transfer tube 8 falls as droplets and is collected by the concave portion 30 formed below the heat transfer tube 8.

The drain recovery pipe 3 is provided outside the recess 30.
1, a pump 32 and a water supply pipe 33 are provided.
Numeral 3 is guided to the uppermost portion in the intake air cooler 2 so that the drain is sprayed again from the nozzle 34. That is,
The collected drain is pressurized by the pump 32 and is injected into the intake air 10 from a nozzle 34 attached upstream of the intake filter 13. In addition, the drain water after the injection is discharged as waste water.

In the fifth embodiment having such a configuration, the intake air can be cooled in the concrete duct 20a, which was a conventional space, and there is no need to install another structure as the intake air cooler 2. . Therefore, for example, when an intake air cooler is to be attached to an existing gas turbine having no intake air cooler, a large installation space is not required on the intake port side, so that the attachment can be performed easily and compactly.

Further, since it is installed downstream of the intake filter 13, clean air from which dust in the intake air 10 has been removed touches the heat transfer tube 8. Therefore, the heat transfer efficiency can be maintained high, the heat transfer area can be reduced, and the configuration of the intake air cooler can be made compact.

Further, since the heat transfer pipe 8 changes the area of the intake passage, a noise reduction effect is produced, and the effect of reducing the noise generated from the gas turbine 6 from leaking outside through the intake equipment is also obtained.

Further, according to the present embodiment, the drain generated in the heat transfer tube 8 is lower than the atmospheric temperature. Therefore, heat is directly exchanged between the drain sprayed from the nozzle 34 and the suction air, thereby cooling the suction air 10. This leads to a reduction in the size of the heat transfer tube 8,
This contributes to downsizing of the intake cooling system.

The liquid-form drain injected into the suction air 10 drops while collecting dust by the dust collecting effect. As a result, the amount of dust entering the intake filter 13 located downstream thereof is reduced, so that an increase in pressure loss of the intake filter 13 can be suppressed, and the life of the filter can be extended.

[0054]

As described above in detail, according to the first aspect of the present invention, the tray for receiving the drain is arranged below the tube group constituted by the heat transfer tubes of the intake air cooler, and the heat transfer tubes above the trays are arranged. By receiving the drain generated in the group, it is possible to prevent the drain from dropping to the heat transfer tube group disposed below the tray. In addition, since the tray is provided with a gradient, the drain generated at the upper part of the heat transfer tube group does not directly contact the lower tube group due to the fall of the drain to the downstream side of the suction air. Can flow down. Therefore, the efficiency of heat transfer in each heat transfer tube can be improved, and a compact configuration can be achieved.

According to the second aspect of the present invention, a slit is formed at the most downstream edge of the tray, and a function of dispersing uniform drain droplets into the suction air from the slit is provided. Dust contained in the sucked air can be collected and removed by a drain droplet. By having such a function, it is possible to reduce the amount of dust collected by the intake filter installed downstream of the intake cooler,
The life of the intake filter can be extended.

Further, according to the third aspect of the present invention, after all the drain droplets including the dust collected at the bottom of the intake air cooler are collected and discharged from the intake air cooler, a part of the drain is again removed from the intake air cooler. The nozzle is sprayed from the uppermost part through the nozzle in the flow of the suction air, so that the suction air passing through the uppermost heat transfer tube can also be dust-removed by the drain droplets, and the dust can be trapped. Collection efficiency can be increased.

Further, according to the fourth aspect of the present invention, since the heat transfer pipe of the intake air cooler is installed in the concrete duct and downstream of the filter, a complicated and large-scale structure is used as the intake air cooler. No need to build. Also,
In the concrete duct, the air from which dust has been removed by the intake filter flows, so that dust does not adhere to the heat transfer tube, and the heat transfer efficiency can be kept high. In addition, by arranging the heat transfer tubes in the concrete duct, the intake air cooler can be simplified, so that it is possible to easily attach the intake air cooler to existing equipment.

According to the fifth aspect of the present invention, the drain generated in the heat transfer tube of the intake air cooler is recovered at a lower portion of the intake air cooler, and is injected into the intake air from a nozzle provided upstream of the intake filter. Therefore, dust in the intake air can be removed by the dust collecting effect of the injected water. Therefore, the intake air can be cooled by injecting the drain into the intake air on the upstream side of the intake filter, which is effective for simplifying the intake air cooler and, at the same time, collecting the dust in the intake air. The amount of dust collected in the filter can be reduced, and the life of the filter can be prolonged.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of an intake air cooler according to the present invention.

FIG. 2 is an explanatory diagram showing an enlarged view of a heat transfer tube unit in the embodiment.

FIG. 3 is an explanatory view showing a second embodiment of the intake air cooler according to the present invention.

FIG. 4 is a side view showing a third embodiment of the intake air cooler according to the present invention.

FIG. 5 is a side view showing a fourth embodiment of the intake air cooler according to the present invention.

FIG. 6 is a graph showing a relationship between gas turbine output and intake air temperature.

FIG. 7 is a configuration diagram showing a conventional intake air cooler.

FIG. 8 is an enlarged view showing a heat transfer tube of the intake air cooler shown in FIG. 7;

9 is a diagram showing the heat transfer tube shown in FIG. 8 in a further enlarged manner.

FIG. 10 is an explanatory diagram showing a condensation operation in a heat transfer tube of a conventional intake air cooler.

FIG. 11 is a graph showing a relationship between a pressure loss of an intake filter and a gas turbine operation time.

FIG. 12 is a configuration diagram showing another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Intake air intake 2 Intake cooler 3 Damper room 4 Intake filter room 5 Intake duct 6 Gas turbine 7 Compressor 8 Heat transfer tube 9 Heat transfer tube group 10 Suction air 10a Clean air 11 Drain discharge pipe 12 Damper 13 Intake filter 14 Cooling medium Piping 15 Heat exchanger 16 Pump 17 Cooling medium 18 Fin 19 Drain 19a Drain droplet 19b Drain 20 Intake silencer 20a Concrete duct 21 Tray 22 Slit 23 Drain recovery pipe 24 Pump 25 Water supply pipe 26 Drain pipe 27 Nozzle 28 Flow control valve 29 Drain Adjustment valve 30 Recess 31 Drain recovery pipe 32 Pump 33 Water supply pipe 34 Nozzle

Claims (5)

[Claims] 1. An intake air cooler which is provided in an intake passage of a gas turbine and has a plurality of heat transfer tubes for cooling intake air by heat exchange, wherein a tray for receiving drain generated by air cooling is provided below the heat transfer tubes. A gas turbine intake air cooler, wherein the tray has a drain gradient descending toward the downstream side of the intake air. 2. A gas turbine intake air cooler according to claim 1, wherein a plurality of slits for uniformly dispersing the drain as droplets are provided at an edge of the tray located downstream of the intake air. And gas turbine intake cooler. 3. The gas turbine intake air cooler according to claim 1, wherein a drain collecting section for collecting drain dripping from an edge of the tray, and a heat transfer pipe connected to the drain collecting section for collecting the collected drain. A gas turbine intake cooler, comprising: a drain supply pipe that feeds into a portion; and a nozzle for drain spray provided at a distal end portion of the drain supply pipe and bringing the drain into contact with suction air at the heat transfer tube portion. . 4. An intake air cooler provided in an intake passage of a gas turbine and having a plurality of heat transfer tubes for cooling suction air by heat exchange, wherein the heat transfer tubes are provided on a downstream side of a suction air purification filter. A gas turbine intake air cooler, which is arranged in a duct. 5. A gas turbine intake cooler according to claim 4, wherein a drain collecting section for collecting drain dropped from the heat transfer tube is connected to the drain collecting section, and the collected drain is provided upstream of a filter in an intake passage. A gas turbine intake air cooler comprising: a drain supply pipe for feeding in; and a nozzle for discharging a drain, which is provided at a distal end portion of the drain supply pipe and makes the drain come into contact with suction air upstream of the filter.