JP2003239760A - Intake air temperature adjusting system for gas turbine and gas turbine with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize a facility used for adjusting an intake air temperature. <P>SOLUTION: In the intake air temperature adjusting system 100 for a gas turbine, hot water stored in a hot water tank 50 is supplied to an intake air heater 10 serving as an intake air temperature adjusting means during a predetermined time from the starting of the gas turbine 20 to heat outer air for combustion supplied to the turbine 20. When the temperature of compressed air in the compressor 21 of the turbine 20 and the temperature of the exhaust gas of the turbine are raised enough after a predetermined time, hot water passed through the heater 10 after heated by a first hot water heater 27 and a second hot water heater 28 is reheated. The hot water is resupplied to the heater 10 by a pump 80 to heat the outer air for combustion to be supplied to the turbine 20. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas turbine, and more particularly, to a gas turbine intake air temperature adjusting system for adjusting the temperature of combustion air of the gas turbine, a gas turbine using the same, and a gas turbine intake air temperature adjusting system. Regarding the method.

[0002]

2. Description of the Related Art A gas turbine has a quick start-up from the start to the rated operation and can use liquid fuel such as light oil or heavy light oil, or gas fuel such as gas fuel obtained by gasifying natural gas or coal. Therefore, there is a feature that a wide variety of fuel is used. Further, since the exhaust gas of the gas turbine has a high temperature, the heat efficiency of the entire plant can be increased by recovering the heat of this exhaust gas to form a so-called gas turbine combined cycle. For this reason, gas turbine combined power generation using a gas turbine is drawing attention from the demand for energy saving, and is currently being used.

A gas turbine is composed of a multi-stage axial flow type compressor, a combustor, and a turbine. Of these, the compressor directly sucks the outside air into a working fluid. Therefore, in gas turbines installed in extremely cold regions, the compressor blades are exposed to the outside air at extremely low temperatures, and as a result, there is a problem that the strength of the blade material is reduced due to low temperature embrittlement and damage due to this low temperature embrittlement. is there.

In order to solve such a problem, there is a method of extracting compressed air from a compressor of a gas turbine to heat the outside air. Further, Japanese Patent Laid-Open No. 9-317496 discloses a first heat exchanger that is provided in an intake passage that supplies air to a gas turbine and that performs heat exchange between the air and a heat medium,
A gas turbine inlet heating and cooling system is disclosed that includes a second heat exchanger that exchanges heat between a heating medium and a heating fluid. Further, in Japanese Patent Laid-Open No. 10-246126, when the temperature of intake air is equal to or higher than a first set temperature, cooling water is introduced from a cooling water supply device to a heating / cooling device for intake air, and the temperature of the intake air is There is disclosed a gas turbine intake system that introduces heated water from a heated water supply device to the heating / cooling device when the temperature is equal to or lower than a second preset temperature that is equal to or lower than a first preset temperature.

[0005]

However, in the method of extracting air from the compressor of the gas turbine, the compressed air originally used to supply the combustor of the gas turbine is used, so that the performance of the gas turbine deteriorates. Will end up. This causes a problem that the efficiency of the plant is lowered.
Further, since compressed air cannot be used as a heat source at the time of starting the gas turbine, the outside air, which is the air for combustion, cannot be sufficiently warmed for a while after the start of the gas turbine. Therefore, it is necessary to separately provide an air heating facility to be used at the time of starting the gas turbine, which causes a problem that the installation cost becomes high and an additional installation space is required.

In the intake turbine heating and cooling system of the gas turbine disclosed in Japanese Patent Laid-Open No. 9-317496, a heat exchanger for exchanging heat between the heating fluid and the heat medium and a heat exchanger for exchanging heat between the heat medium and air. is necessary. Therefore, the system becomes complicated and maintenance and inspection may be troublesome. Furthermore, since two heat exchangers are used, the system becomes large, and there are problems that the installation cost becomes high and an additional installation space is required. Further, since the heating medium is first heated by the heating fluid and then the air is heated, the efficiency of heating the air is reduced due to the escape of heat. As a result, more energy is required to heat the air for combustion, which causes a problem of reducing plant efficiency.

The gas turbine intake system disclosed in Japanese Patent Laid-Open No. 10-246126 requires a cooling water supply device and a heating water supply device. Since it is necessary to continue supplying heated water to the heating / cooling device during operation of the gas turbine, a large capacity such as cooling water supply means is required, resulting in high installation cost and extra installation space. There is a problem of doing. Further, since a large amount of energy is required to cool or heat a large amount of water, there is also a problem of reducing plant efficiency.

[0008] Therefore, the present invention has been made in view of the above, and suppresses the low-temperature embrittlement of the gas turbine compressor blade while suppressing a decrease in plant efficiency even during operation in an extremely cold region, and adjusts the intake air temperature. It is an object of the present invention to provide a gas turbine intake air temperature adjustment system, a gas turbine using the same, and a gas turbine intake air temperature adjustment method that can achieve at least one of compacting the equipment used for.

[0009]

In order to achieve the above object, an intake air temperature adjusting system for a gas turbine according to a first aspect of the present invention is provided with an intake air temperature for heating combustion air supplied to a gas turbine by a heating medium. Adjusting means, heating medium supplying means for supplying a heating medium to the intake air temperature adjusting means, medium heating means for heating the heating medium after heating the air by the heat of the gas turbine, and heating after heating the air A heating medium storage means for storing a heating medium, the heating medium supplying means supplies the heating medium to the intake air temperature adjusting means until a predetermined time elapses after the gas turbine is started, and The heating medium that has passed through the heating means is stored in the heating medium storage means, and after the lapse of the predetermined time, the heating medium that has passed through the medium heating means is taken into the intake air temperature adjusting means. And supplying.

In this intake temperature adjusting system for a gas turbine, the combustion medium stored in the heating medium supplying means such as a tank is supplied to the intake temperature adjusting means for a predetermined time after the start of the gas turbine, and the combustion medium is supplied to the gas turbine. Warm the air for. If the temperature of the compressor air or exhaust gas of the gas turbine becomes sufficiently high after the start of the gas turbine, the heating after heating the air by the medium heating means using the exhaust gas of the gas turbine, etc. Reheat the working medium. Then, this heating medium is supplied to the intake air temperature adjusting means to warm the combustion air supplied to the gas turbine.

Therefore, if the heating medium previously heated is supplied from the heating medium supply means for a certain period of time until the exhaust gas temperature of the gas turbine reaches a temperature sufficient to reheat the heating medium. Since it is good, the volume of the heating medium supply means can be reduced. As a result, the intake air temperature adjustment system can be made compact. Further, since the amount of the heating medium to be preheated before starting the start of the gas turbine can be small, the energy for heating the medium can be small. Then, when the temperature of the exhaust gas or the like of the gas turbine rises sufficiently, the heating medium is reheated by the exhaust gas or the like to heat the combustion air, so that the thermal energy of the exhaust gas can be effectively used. By these effects, it is possible to suppress the low temperature embrittlement of the compressor blade and also suppress the decrease in the efficiency of the entire plant. The heating medium supply means may be provided with a heating means to heat the heating medium stored inside. Further, the operation of the gas turbine may be started after supplying hot water to the heating medium supply means before the operation.

Further, an intake air temperature adjusting system for a gas turbine according to a second aspect of the present invention is characterized in that, in the intake air temperature adjusting system for the gas turbine, a damper is further provided upstream of the intake air temperature adjusting means. Therefore, when the gas turbine is stopped and the outside air becomes extremely low temperature, this damper is closed to prevent the extremely low temperature outside air from flowing into the intake air temperature adjusting means and the compressor of the gas turbine. It is possible to suppress the temperature drop. As a result, it is possible to reduce the shocking thermal stress generated in the intake air temperature adjusting means and the compressor blade due to the rapid temperature rise during the next operation. As a result, it is possible to suppress these damages, operate with high reliability, and extend the life.

The intake temperature adjusting system for a gas turbine according to a third aspect of the present invention is the intake temperature adjusting system for a gas turbine, wherein the heating medium is further provided in a heating medium supply pipe for flowing the heating medium. And a heating medium for heating the heating medium after the gas turbine is stopped. The intake air temperature control system of this gas turbine is equipped with a heating means for heating the heating medium supply pipe for flowing the heating medium. As a result, it is possible to prevent the heating medium from freezing even when the operation of the gas turbine is stopped and when the outside air has an extremely low temperature. As a result, it is possible to prevent the pipe for supplying the heating medium from bursting, so that the gas turbine can be operated stably even in the extremely cold season.

An intake air temperature adjusting system for a gas turbine according to a fourth aspect of the present invention is the intake air temperature adjusting system for a gas turbine, further comprising a pipe connecting the intake air temperature adjusting means and the heating medium storing means. Further, the heating medium supply means stores a cooling medium having a temperature lower than the temperature of the air supplied to the gas turbine, and when the temperature of the air is higher than a predetermined temperature, the intake temperature adjusting means Combustion air supplied to the gas turbine is cooled by supplying the cooling medium, and the cooling medium after air cooling is stored in the heating medium storage means through the pipe.

The intake air temperature control system of this gas turbine stores the cooling medium in the heating medium supply means instead of the heating medium, and inhales this cooling medium when the temperature becomes high in the summer daytime. It is supplied to the temperature adjusting means to cool the air used for combustion of the gas turbine. As a result, the output of the gas turbine can be increased more than before even during the time period when the temperature rises and the efficiency of the gas turbine decreases, even though the demand for electric power is high during the daytime in summer. Therefore, the reliability of the power supply can be improved. Further, in the extremely cold season of winter, the temperature of the combustion air of the gas turbine is heated by the heating medium, so that low-temperature embrittlement of the compressor blade can be suppressed and highly reliable operation can be performed. This will ensure a stable power supply throughout the year. Since the cooling medium after cooling the air is stored in the heating medium storage means, the cooling medium is not wasted.

According to a fifth aspect of the present invention, there is provided an intake air temperature adjusting system for a gas turbine, wherein the intake air temperature adjusting system for the gas turbine further includes cooling means for cooling the cooling medium stored in the heating medium supplying means. It is characterized by having. Since the intake air temperature control system of the gas turbine includes the cooling medium cooling means, the cooling medium can be cooled efficiently. Further, since the output of the gas turbine can be increased by cooling the combustion air, if the cooling medium is cooled by using the surplus power at night, the surplus power at night will be increased in the daytime when the power demand increases. It will be usable. This can also alleviate the bias in power demand.

According to a sixth aspect of the present invention, there is provided an intake air temperature adjusting system for a gas turbine, wherein the intake air temperature adjusting system for the gas turbine has a temperature higher than a temperature of air supplied to the heating medium storage means. A low temperature cooling medium is stored, and when the temperature of the air is higher than a predetermined temperature, the cooling medium is supplied to the intake air temperature adjusting means to cool the combustion air to be supplied to the gas turbine. It is characterized by

The intake air temperature control system of this gas turbine stores the cooling medium in the heating medium storage means instead of the heating medium, and inhales this cooling medium when the temperature rises in the summer daytime. It is supplied to the temperature adjusting means to cool the air used for combustion of the gas turbine. The cooling medium stored in the heating medium storage means is cooled at night when the temperature is low. Since the cooling medium stored in the heating medium storage means has a large heat capacity, once the temperature drops, the temperature does not rise immediately even during the daytime. Therefore, if a cooling medium having a temperature lower than that of the outside air is supplied to the intake air temperature adjusting means, the outside air, which is the air used for combustion in the gas turbine, can be cooled.

As a result, the output of the gas turbine is increased as compared with the conventional case even in the time zone when the temperature rises and the efficiency of the gas turbine decreases, even though the demand for electric power is high during the daytime in summer. Therefore, the reliability of the power supply can be improved. Further, since the heating medium storage means having a large volume is used, the cooling medium can be supplied to the intake air temperature adjusting means for a longer period of time than when the heating medium supply means is used. As a result, it is possible to suppress the output reduction of the gas turbine for a longer period of time.

A gas turbine according to a seventh aspect of the present invention includes an intake air temperature adjusting system for the gas turbine, and a compressor for compressing air whose temperature is adjusted by the gas turbine intake air temperature adjusting system to produce combustion air. A combustor that supplies fuel to the combustion air to burn it and generate combustion gas,
And a turbine driven by the combustion gas.

Since this gas turbine is provided with the intake air temperature adjusting system, it is possible to suppress the deterioration of the efficiency of the gas turbine plant while suppressing the low temperature embrittlement of the compressor blades. Also, because the entire plant can be made compact,
You can effectively use the installation space.

Further, in the method for adjusting the intake air temperature of the gas turbine according to the eighth aspect, the temperature is higher than the air stored in the heating medium supply means and supplied to the gas turbine until a predetermined time elapses after the start of the gas turbine. After heating the combustion air supplied to the gas turbine with the temperature heating medium and heating the air supplied to the gas turbine, the heating medium is stored in the heating medium storage means, and after the predetermined time has elapsed. Is used to heat the combustion medium after heating the combustion air by the heat of the gas turbine and then to heat the combustion air again.

The method for adjusting the intake air temperature of this gas turbine is as follows:
For a predetermined time from the start of the gas turbine, the heating medium stored in the heating medium supply means is supplied to the intake air temperature adjusting means to warm the combustion air supplied to the gas turbine. When the temperature of the air or exhaust gas compressed by the compressor of the gas turbine becomes high enough to heat the heating medium after a lapse of a predetermined time after starting the gas turbine, the heating medium is reheated by the heat of the gas turbine. To heat. Then, this heating medium is supplied to the intake air temperature adjusting means to warm the combustion air supplied to the gas turbine.

Therefore, the heating medium previously heated is supplied from the heating medium supply means such as a tank for a certain time until the exhaust gas temperature of the gas turbine reaches a temperature sufficient to reheat the heating medium. Therefore, the volume of the heating medium supply means can be reduced. As a result, the gas turbine plant can be made compact. Further, since the amount of the heating medium preheated which is used for a certain period after the start of the gas turbine is small, the energy for heating the medium is also small. Then, when the temperature of the exhaust gas or the like of the gas turbine rises sufficiently, the heating medium is reheated by the exhaust gas or the like to heat the combustion air, so that the thermal energy of the exhaust gas can be effectively used. By these effects, it is possible to suppress the low temperature embrittlement of the compressor blade and also suppress the decrease in the efficiency of the entire plant. The heating medium supply means may be provided with a heating means to raise the temperature of the heating medium inside. Further, the operation of the gas turbine may be started after supplying hot water to the heating medium supply means before the operation.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail with reference to the drawings. The present invention is not limited to this embodiment. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

(Embodiment 1) FIG. 1 is an explanatory diagram showing an intake air temperature adjusting system for a gas turbine according to Embodiment 1 of the present invention. This gas turbine intake air temperature control system includes an intake air heater, a hot water tank, and a plant water storage tank.When the gas turbine is started, the intake water is heated by the hot water in the hot water tank, and the intake air is heated by the exhaust gas of the gas turbine. The feature is that the later hot water is stored in the water storage tank. First, the gas turbine 20 will be described.

The outside air, which is the air for combustion, is the gas turbine 2
It is taken into the compressor 21 from the air intake port 26 of 0,
Here, after being compressed into high temperature and high pressure air, it is sent to the combustor 22. An intake air heater 10 as an intake air temperature adjusting means is provided on the upstream side of the air intake port 26 to heat the combustion air taken into the compressor 21 of the gas turbine 20. Will be described later. The combustion air sent to the combustor 22 is combusted by a fuel such as natural gas or light heavy oil supplied by the combustor 22 to generate high temperature / high pressure combustion gas. This combustion gas is injected into the turbine 23 and drives it. The turbine 23 rotates the compressor 21 and drives a generator 25 connected to a turbine shaft 24 to generate electric power.

Now, consider a case where the gas turbine 20 is installed in a region where the outside temperature is extremely low, such as a cold region. In such regions, the outside air temperature may reach −50 ° C. or lower during the severe cold season. Therefore, if this extremely low temperature outside air is taken into the compressor 21 of the gas turbine 20 as it is as combustion air, there is a risk of strength deterioration due to low temperature embrittlement of a compressor blade (not shown) and damage accompanying it. growing. Therefore, in the gas turbine according to the first embodiment, the intake air heater 10 is provided at the inlet of the compressor 21, and the extremely low temperature outside air is warmed and then supplied to the compressor 21.

The intake air heater 10 heats the outside air, which is the combustion air supplied to the compressor 21 of the gas turbine 20, by the hot water serving as the heating medium sent from the hot water tank 50 serving as the heating medium supply means. An antifreezing liquid such as ethylene glycol or propylene glycol may be used as the heating medium instead of water. When such an antifreezing liquid is used, the heating medium does not freeze even when the operation of the gas turbine 20 is stopped and the outside air becomes extremely low temperature, so that a rupture accident of the pipes 81 and 82 can be prevented in advance.
Further, even in an extremely low temperature environment where the antifreeze solution freezes, the heating by the heater described later can be minimized, so that the energy required to prevent freezing can be reduced.

A damper 30 capable of blocking outside air is provided on the upstream side of the intake air heater 10. Then, while the gas turbine 20 is at rest, the damper 30 is closed,
It is possible to prevent outside air from flowing into the intake air heater 10. This is to prevent the extremely low temperature outside air from cooling the intake air heater 10, the compressor 21, etc. while the gas turbine 20 is at rest. Further, the intake air temperature adjusting system 100 is installed in the building 36 in order to protect the entire system from extremely low temperatures in extremely cold regions. The warm water tank 50 has a heater 5 as a heating means.
0a is provided, and the water supplied to the intake air heater 10 is heated to make hot water. The heating means may be Joule heat generated by electricity, or steam may be supplied to the hollow heat coil to exchange heat with the water in the hot water tank 50. In the latter case, for example, steam from an auxiliary boiler provided in the plant can be used. The hot water heated to a predetermined temperature by being heated in the hot water tank 50 is supplied to the intake heater 10 by the pump 80.

The hot water after heating the outside air exchanges heat with the outside air, which is air for combustion, and the temperature thereof decreases. The hot water after the heat exchange is guided to the first hot water heater 27 which is a medium heating means for heating the hot water by the compressed air produced by the compressor 21 of the gas turbine 20. Then, the hot water heated here is sent to the second hot water heater 28 which is a medium heating means for heating the hot water by the exhaust gas of the gas turbine 20, and is further heated there. A three-way valve 72 is provided downstream of the second warm water heater 28. And the three-way valve 7
By switching 2 the hot water heated by the second hot water heater 28 is made to flow to either the pump 80 side or the water storage tank 40 side. Two medium heating means may be provided as in this example, or either one of them may be used. If you use either one,
From the viewpoint of quick reheating of the hot water, it is desirable to use the second hot water heater 28 that can utilize the gas turbine exhaust gas having a high temperature level.

Immediately after the start of the gas turbine 20, the temperature of the combustion air compressed by the compressor 21 and the temperature of the exhaust gas of the gas turbine 20 are supplied to the intake heater 10 to the extent that they can be used to heat the outside air. The temperature of hot water cannot be raised. Therefore, the first warm water heater 27
And the hot water heated by the first hot water heater 27 and the like is stored in the water storage tank 40 which is the heating medium storage means until the temperature of the hot water can be sufficiently heated by the second hot water heater 28.
Then, the intake heater 10 is supplied with hot water sufficiently warmed in the hot water tank 50.

When the temperature of the combustion air and the exhaust gas in the compressor 21 rises sufficiently after a while after the start of the gas turbine 20, the three-way valve 72 is switched so that the hot water heated by the first hot water heater 27 etc. Supply to the intake air heater 10. The switching of the three-way valve 72 is performed when the hot water temperature measured by the thermometer 32, which is a hot water temperature measuring unit, reaches a preset temperature (here, 80 ° C.).
The controller provided in 1 switches the three-way valve 72.
Further, the three-way valve 72 may be switched by a manual operation without using the control device 31.

Gas turbine intake air temperature control system 10
After the operation of 0 is completed, the warming heater 34, which is a heating means provided in the pipe 81 that is one of the heating medium supply pipes, causes the pipe 82 that is the heating medium supply pipe.
Keep the water remaining in the inside such as 84. by this,
Even when the gas turbine is stopped and the outside air has a very low temperature, it is possible to prevent the water remaining inside the pipes 82 and 84 from freezing and prevent the pipes 82 and 84 from bursting. As a result, the intake air temperature adjustment system 100 of the gas turbine can be stably operated even in an extremely cold region, so that electric power can be stably supplied even in such a region. The heat retaining heater 34 may be provided in the pipes 82 and 84, or may be provided in the pipes 81, 82 and 84, respectively. In the latter case, the temperature drop of the water circulating inside the pipe 81 or the like can be reduced, so that the reliability of freeze prevention is improved.

Further, without providing the heat-retaining heater 34 or the like, the pump 80 may be operated to constantly circulate the water in the pipes 82 and 84 during the suspension period of the intake temperature adjusting system 100 of the gas turbine. . Even in this case, it is possible to prevent the water inside the pipes 82 and 84 from freezing. Further, the water inside the pipes 82 and 84 may be kept warm by the heat-retaining heater 34 and at the same time the pump 80 may be operated to circulate the water inside the pipe 82. By doing so, it is possible to more reliably prevent the water in the pipe 82 and the like from freezing, and it is possible to operate the gas turbine intake air temperature adjustment system 100 in a stable manner even in extremely cold regions. Can be higher.

In this intake air temperature adjusting system 100, the outside air can be heated even when the temperature of the combustion air or the temperature of the exhaust gas is not sufficiently high such as when the gas turbine 20 is started. The risk of strength reduction due to low temperature embrittlement of No. 1) and accompanying damage can be reduced.
Further, at this time, the hot water stored in the hot water tank 50 is used, but the hot water may be supplied from the hot water tank 50 to the intake heater 10 until the temperature of the combustion air of the gas turbine 20 or the temperature of the exhaust gas rises. . Therefore, the capacity of the hot water tank 50 can be reduced, so that the construction cost of the plant can be suppressed.

(Second Embodiment) FIG. 2 is an explanatory diagram showing an intake air temperature adjusting system for a gas turbine according to a second embodiment of the present invention. This gas turbine intake air temperature adjustment system 101 has substantially the same configuration as the gas turbine intake air temperature adjustment system 100 (see FIG. 1) according to the first embodiment, but the hot water tank is further provided with cooling means. It is characterized in that cold water is produced and when the temperature is high in summer, the cold water is supplied to the intake heater to cool the outside air.
Since other configurations are similar to those of the first embodiment, the description thereof will be omitted and the same components will be denoted by the same reference numerals.

In addition to the heater 50a, the hot water tank 51 is provided with a cooler 51c which is a cooling means, and cools the water stored in the hot water tank 51 which is a heating medium supply means to serve as a cooling medium. Make cold water. The cold water is supplied to the intake air heater 10 which is an intake air temperature adjusting means by the pump 80.
Is supplied to. This cold water can be produced by operating a refrigerator (not shown) using surplus power at night. If you have existing refrigeration equipment,
The cold water produced here may be supplied to the hot water tank 51.
In this way, the cooler 51c is not required in the hot water tank 51, so that the equipment cost of the system can be suppressed. A three-way valve 7 is provided in the middle of a pipe 82 connecting the intake air heater 10 and the first hot water heater 27 provided in the gas turbine 20.
4 is provided. Also, one outlet 7 of the three-way valve 74
4a and the water storage tank 40 are connected by a pipe 88 that bypasses the first warm water heater 27 and the like. By switching the three-way valve 74, the water after heat exchange with the outside air by the intake air heater 10 is sent to either the first warm water heater 27 or the water storage tank 40.

When the outside temperature is high as in the summer daytime,
Since the air density becomes low, the output of the gas turbine 20 decreases, and as a result, the power generation output also decreases. Further, in general, the electric power demand peaks in the daytime in summer, so the decrease in the power generation output during this time period should be avoided, and more preferably, the power generation output should be increased. Therefore, when the outside air temperature used as the air for combustion is high, the cold water stored in the hot water tank 51 is supplied to the intake heater 10
To cool the outside air. Here, the case where the outside air temperature is high is the case where the air temperature exceeds approximately 35 ° C., but when the air temperature exceeds 30 ° C., it is preferable to cool the outside air and supply it to the gas turbine 20. . Also,
Since the demand for electric power generally increases as the temperature rises, the temperature for cooling the outside air with cold water may be determined from the relationship between the demand for electric power and the temperature.

By doing so, the output of the gas turbine 20 can be increased as compared with the case where the outside air is directly supplied to the gas turbine 20. As a result, it is possible to supply electric power without lowering the power generation output even during a time period when the electric power demand is at a peak, such as the daytime in summer. Further, since the warm water tank 51 is installed in the building 36, it is possible to suppress the rise in water temperature due to the outside air even in the hot season of summer. As a result, the outside air can be cooled more stably, so that low-temperature combustion air can be stably supplied to the gas turbine 20 as well, and fluctuations in the output of the gas turbine 20 can be suppressed.

For example, in a 250 MW class gas turbine power plant, the capacity of the hot water tank 51 is 80 m.
^In the case of ³ , the output of the gas turbine 20 is increased by 3% when 80 m ³ of cold water is flowed for 40 minutes. Along with this, the power generation output also increases. Moreover, when it flows for 60 minutes, the gas turbine output increases by 2%. However, this is the case when the outside air temperature is 35 ° C. and the water temperature of the cold water is 10 ° C.

(Modification 1) FIG. 3 is an explanatory diagram showing an intake air temperature adjustment system for a gas turbine according to Modification 1 of the second embodiment. This gas turbine intake air temperature adjustment system 102 has substantially the same configuration as the gas turbine intake air temperature adjustment system 101 (see FIG. 2) according to the second embodiment, but it intakes the water stored in the water storage tank 40. It is characterized in that it is supplied to the heater 10 to cool the outside air supplied to the gas turbine 20 when the temperature is high such as in summer. Since other configurations are similar to those of the second embodiment, description thereof will be omitted and the same components will be denoted by the same reference numerals.

As shown in FIG. 3 (a), a three-way valve 76 is provided in the middle of a pipe 86 connecting the hot water tank 51 and the water storage tank 40, which is a heating medium storage means. A pipe 81 is connected to one outlet 76a of the three-way valve 76, and by switching the three-way valve 76, the water tank 40
The water stored in the pump is supplied to the pump 80. The water stored in the water storage tank 40 is cooled at night when the temperature is low. Since a large amount of water is stored in the water storage tank 40, once the temperature drops, the water temperature does not immediately rise even if the temperature rises in the daytime.

The three-way valve 7 is used during the daytime when the power demand is high.
6 is switched, the pump 80 is operated, and the intake air heater 10
The water in the water storage tank 40 is supplied to. This water storage tank 40
The outside air is cooled by the water supplied from the above, and the output reduction of the gas turbine 20 is suppressed. Then, the water after cooling the outside air is returned to the water storage tank 40 through the three-way valve 74. Here, the output of the intake air temperature control system 102 of the gas turbine in the summer will be described. For example,
Consider a case where the capacity of the water storage tank 40 is 3000 m ³ in a 250 MW class gas turbine power plant. At this time, if 3000 m ³ of water is made to flow for 3 hours, the output of the gas turbine 20 becomes 1% higher. Along with this, the power generation output also rises. However, the outside temperature is 35
This is the case where the temperature of cold water is 30 ° C.

When using a gas turbine power plant in an extremely cold region, the water storage tank 40 may be installed in the building 36 in order to prevent freezing. In this case, the openable window 36a provided in the building 36 may be opened at night to take in outside air into the building 36 to cool the water in the water storage tank 40. By doing so, the water in the water storage tank 40 can be cooled more efficiently, so that the outside air can be further cooled in the intake air heater 10. As a result, the output of the gas turbine 20 can be further increased.

Further, as shown in FIG. 3B, a cooling device 38, which is a means for cooling water, is provided downstream of the water storage tank 40 to cool the water in the water storage tank 40 to the intake heater 10. May be supplied. This way,
Since the outside air can be cooled more efficiently, the gas turbine 20
The output of can be larger. As the cooling device 38 at this time, for example, an absorption refrigerator described later can be used.

(Modification 2) FIG. 4 is an explanatory diagram showing an intake air temperature adjusting system for a gas turbine according to Modification 2 of the second embodiment. The gas turbine intake air temperature adjustment system 103 has substantially the same configuration as the gas turbine intake air temperature adjustment system 101 (see FIG. 2) according to the second embodiment, but the intake air temperature adjustment system including the water injection means 33 is provided. It is characterized in that the outside air is cooled by the intake air heater 11 as a means. Since other configurations are similar to those of the second embodiment, description thereof will be omitted and the same components will be denoted by the same reference numerals.

As shown in FIG. 4, the intake heater 11 has a high-pressure pump 33a and a spray nozzle 33 which are water injection means.
b and are provided. Further, the pipes 81 and 82 are provided with three-way valves 71 and 73, and by switching these three-way valves, the cold water sent from the hot water tank 51 is supplied to the high-pressure pump 33a. In winter, the three-way valves 71 and 73 are switched to supply the hot water supplied from the hot water tank 51 to the intake heater 11.

During the time when the outside air temperature is high and the electric power demand is high, such as the summer daytime, the cold water in the hot water tank 51 is supplied to the high-pressure pump 33a. The cold water whose pressure has been increased by the high-pressure pump 33a is sprayed from the spray nozzle 33b into the intake heater 11 to lower the temperature of the outside air passing therethrough. The water used for cooling is collected in the water storage tank 40 through the drain pipe 85.

This intake air heater 11 cools cold water to the outside air passage 1
Since the water is injected into 1a, the heat transfer between the cold water and the outside air passage 11a can be promoted, and the temperature of the outside air can be lowered more efficiently. Further, since mist-like cold water is sprayed into the outside air passage 11a by the spray nozzle 33b, the cold water is easily vaporized. And by the heat of vaporization when cold water vaporizes,
The outside air is cooled more. By these actions, the intake temperature control system 10 for the gas turbine according to the second embodiment
As compared with No. 1 (see FIG. 2), the cooling of the outside air is further promoted, so that the output of the gas turbine 20 can be increased. As a result, it is possible to supply electric power without lowering the power generation output even during a time period when the power demand is high.

(Third Embodiment) FIG. 5 is an explanatory diagram showing an intake air temperature adjusting system for a gas turbine according to a third embodiment. Intake air temperature control system 10 for this gas turbine
4 uses the exhaust gas of the gas turbine to generate steam,
It is characterized in that this vapor is supplied to an absorption refrigerator to produce low temperature air, cold water or other outside air cooling medium. Gas turbine 2
The combustion gas that has driven the turbine 23 of 0 becomes exhaust gas and is discharged to the outside of the gas turbine 20. Since the temperature of this exhaust gas is still high, HRSG (Heat Recovery Steam Ge
The heat is recovered by a heat recovery means such as a nerator (exhaust heat recovery boiler) 35 and an exhaust gas economizer (not shown).

The HRSG 35 produces steam, which is supplied to the high-pressure, intermediate-pressure and low-pressure steam turbines 39 in accordance with the steam temperature and the steam pressure to drive the generator 39a. Then, the steam after driving the steam turbine 39 is supplied to the absorption refrigerator 37 to produce cold water or low-temperature air, and these are supplied to the cooler 51c provided in the hot water tank 51, and the cold water or the low temperature air is supplied to the inside of the hot water tank 51. Cool the water. The absorption refrigerating machine 37 may be directly supplied with steam produced by the HRSG 35. Further, low temperature air or cold water may be directly supplied to the water in the hot water tank 51 to cool it without cooling the water in the hot water tank 51 via the cooler 51c. Further, the low temperature air produced by the absorption refrigerator 37 is directly fed to the gas turbine 20.
It may be supplied to the compressor 21. By doing so, it is not necessary to exchange heat with the cold water in the hot water tank 51, so that the output of the gas turbine 20 can be increased more efficiently. The intake temperature control system 104 of the gas turbine uses the water in the hot water tank 51 to pass the exhaust heat of the gas turbine 20 recovered by the HRSG 35 to the gas turbine 20.
Available to increase output. As a result, the exhaust heat of the gas turbine 20 can be used more effectively and the efficiency of the plant can be increased.

[0053]

As described above, in the intake air temperature control system for a gas turbine of the present invention (claim 1), the heating medium stored in the heating medium supply means such as a tank for a predetermined time from the start of the gas turbine. To the intake air temperature adjusting means to warm the combustion air to be supplied to the gas turbine, and after a predetermined time has passed after the start of the gas turbine, after warming the air by the medium heating means using the exhaust gas of the gas turbine, etc. The heating medium was heated again. For this reason,
The heating medium may be supplied from the heating medium supply means for a certain period of time until the exhaust gas temperature of the gas turbine reaches a temperature sufficient to reheat the heating medium. The volume of the supply means can be reduced. As a result, the intake air temperature adjustment system can be made compact. Further, since the amount of the heating medium to be preheated before starting the start of the gas turbine can be small, the energy for heating the medium can be small. Further, when the temperature of the gas turbine exhaust gas or the like rises sufficiently, the heating medium is reheated by the exhaust gas or the like to heat the combustion air, so that the thermal energy of the exhaust gas or the like can be effectively used. As a result, it is possible to suppress low-temperature embrittlement of the compressor blade and also suppress a decrease in efficiency of the entire plant.

Further, in the intake temperature adjusting system for a gas turbine of the present invention (claim 2), a damper is provided upstream of the intake temperature adjusting means. Therefore, by closing this damper at night when the temperature drops, it is possible to prevent the extremely low temperature outside air from flowing into the intake air temperature adjusting means or the like. as a result,
Since these temperature decreases can be suppressed, it is possible to reduce the shocking thermal stress generated in the intake air temperature adjusting means and the compressor blade due to the rapid temperature increase during the next operation.
As a result, it is possible to suppress damage to the intake air temperature adjusting means and the like and perform highly reliable operation.

Further, in the gas turbine intake air temperature control system of the present invention (claim 3), the heating medium supply pipe for flowing the heating medium is provided with the heating means for heating the pipe. As a result, the heating medium can be prevented from freezing even at extremely low temperature nights when the operation of the gas turbine is stopped, so that the pipes that supply the heating medium can be prevented from bursting and the gas turbine can be operated stably even during the extremely cold season. it can.

Further, in the intake-air temperature control system for a gas turbine according to the present invention (claim 4), instead of the heating medium, the cooling medium is stored in the heating medium supply means, and the temperature is kept as in the daytime in summer. When the temperature rises, this cooling medium is supplied to the intake air temperature adjusting means to cool the air used for combustion in the gas turbine. As a result, the output of the gas turbine can be increased more than in the past even during a time period in which the power demand is high, such as the daytime in summer, so that the reliability of the power supply can be improved. Further, in the extremely cold season of winter, the temperature of the combustion air of the gas turbine is heated by the heating medium, so that low-temperature embrittlement of the compressor blade can be suppressed and highly reliable operation can be performed. This will ensure a stable power supply throughout the year.

Further, in the gas turbine intake air temperature control system of the present invention (claim 5), since the cooling medium cooling means is provided, the cooling medium can be cooled efficiently,
The plant efficiency can be improved.

Further, in the intake air temperature control system for a gas turbine according to the present invention (claim 6), instead of the heating medium, the cooling medium is stored in the heating medium storage means, and the temperature is kept as in the daytime in summer. When the temperature rises, this cooling medium is supplied to the intake air temperature adjusting means to cool the air used for combustion in the gas turbine. As a result, it is possible to suppress the decrease in the output of the gas turbine even during a time period in which the power demand is high, such as the daytime in the summer, so that it is possible to improve the reliability of the power supply more than before. Further, since the heating medium storage means having a larger volume than that of the heating medium supply means is used, the cooling medium can be supplied to the intake air temperature adjusting means for a longer time. As a result, it is possible to suppress a decrease in output of the gas turbine for a longer period of time.

Further, in the gas turbine of the present invention (claim 7), since the intake air temperature adjusting system is provided, it is possible to suppress the low-temperature embrittlement of the compressor blade and suppress the efficiency decrease of the gas turbine plant. Further, the entire plant can be made compact, so that the installation space can be effectively used.

Further, according to the method for adjusting the intake air temperature of the gas turbine of the present invention (claim 8), the heating medium stored in the heating medium supply means is supplied to the intake temperature adjustment means for a predetermined time after the start of the gas turbine. Warm the combustion air supplied to the gas turbine. When the temperature of the air or exhaust gas compressed by the compressor of the gas turbine becomes high enough to heat the heating medium after a lapse of a predetermined time after starting the gas turbine, the heating medium is reheated by the heat of the gas turbine. To heat. Then, this heating medium is supplied to the intake air temperature adjusting means to warm the combustion air supplied to the gas turbine.

Therefore, the heating medium previously heated is supplied from the heating medium supply means such as a tank for a certain period of time until the exhaust gas temperature of the gas turbine reaches a temperature sufficient to reheat the heating medium. Therefore, the volume of the heating medium supply means can be reduced. As a result, the gas turbine plant can be made compact. Further, since the amount of the heating medium preheated which is used for a certain period after the start of the gas turbine is small, the energy for heating the medium is also small. Furthermore, when the temperature of the exhaust gas or the like of the gas turbine rises sufficiently, the heating medium is reheated by the exhaust gas or the like to heat the combustion air, so that the thermal energy of the exhaust gas or the like can be effectively used. As a result, it is possible to suppress low-temperature embrittlement of the compressor blade and also suppress a decrease in efficiency of the entire plant.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an intake air temperature adjustment system for a gas turbine according to Embodiment 1 of the present invention.

FIG. 2 is an explanatory diagram showing an intake air temperature adjustment system for a gas turbine according to Embodiment 2 of the present invention.

FIG. 3 is an explanatory diagram showing an intake air temperature adjustment system for a gas turbine according to a first modification of the second embodiment.

FIG. 4 is an explanatory diagram showing an intake air temperature adjustment system for a gas turbine according to a second modification of the second embodiment.

FIG. 5 is an explanatory diagram showing an intake air temperature adjustment system for a gas turbine according to a third embodiment.

[Explanation of symbols]

10, 11 Intake heater 11a Outside air passage 20 Gas turbine 21 Compressor 22 Combustor 23 Turbine 26 Air intake 27 First hot water heater 28 Second hot water heater 30 Damper 34 Insulated heater 40 Water storage tank 50, 51 Hot water tank 50a , 51a Heater 51c Cooler 81, 82, 84, 86, 88 Piping 85 Drain piping 100, 101, 102, 103, 104 Intake air temperature adjusting system

Claims (8)

[Claims] 1. An intake air temperature adjusting means for heating combustion air to be supplied to a gas turbine by a heating medium, a heating medium supplying means for supplying a heating medium to the intake temperature adjusting means, and an after-air heating device. A medium heating means for heating the heating medium by the heat of the gas turbine, and a heating medium storage means for storing the heating medium after heating the air are provided, and until the predetermined time elapses from the start of the gas turbine. The heating medium is supplied from the heating medium supply means to the intake air temperature adjusting means, and the heating medium that has passed through the medium heating means is stored in the heating medium storage means, and after the predetermined time has elapsed, the An intake air temperature adjusting system for a gas turbine, wherein the heating medium that has passed through the medium heating means is supplied to the intake air temperature adjusting means. 2. The intake temperature adjusting system for a gas turbine according to claim 1, further comprising a damper provided upstream of the intake temperature adjusting means. 3. A heating medium supplying pipe for flowing the heating medium is provided with heating means for heating the heating medium, and the heating medium is heated by the heating means after the operation of the gas turbine is stopped. The intake air temperature control system for a gas turbine according to claim 1, wherein 4. A pipe connecting the intake air temperature adjusting means and the heating medium storage means is provided, and the heating medium supply means is cooled to a temperature lower than the temperature of the air supplied to the gas turbine. A medium is stored, and when the temperature of the air is higher than a predetermined temperature, the cooling medium is supplied to the intake air temperature adjusting means to cool the combustion air to be supplied to the gas turbine. The intake air temperature control system for a gas turbine according to claim 1, wherein the cooling medium is stored in the heating medium storage means through the pipe. 5. The intake temperature adjusting system for a gas turbine according to claim 4, wherein the heating medium supply means is further provided with a cooling means for cooling the cooling medium stored therein. 6. The heating medium storage means stores a cooling medium having a temperature lower than the temperature of the air supplied to the gas turbine, and when the temperature of the air is higher than a predetermined temperature. The intake air temperature adjustment of a gas turbine according to any one of claims 1 to 3, wherein the cooling medium is supplied to the intake air temperature adjusting means to cool combustion air supplied to the gas turbine. system. 7. An intake air temperature adjusting system for a gas turbine according to claim 1, and a compressor for compressing air whose temperature is adjusted by the gas turbine intake air temperature adjusting system to produce combustion air. A gas turbine, comprising: a machine, a combustor that supplies fuel to the combustion air to combust it to generate combustion gas, and a turbine driven by the combustion gas. 8. The combustion medium supplied to the gas turbine with a heating medium having a temperature higher than that of the air stored in the heating medium supply means and supplied to the gas turbine until a predetermined time elapses after the start of the gas turbine. The heating medium after heating the air and heating the air to be supplied to the gas turbine is stored in the heating medium storage means, and after the predetermined time has elapsed, the heating medium after heating the combustion air is stored. A method for adjusting an intake air temperature of a gas turbine, which is used to heat the air for combustion again after heating by the heat of the gas turbine.