JPH11303650A - Gas turbine plant, and its intake cooling method and operating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively cool the intake air and prevent lowering of compressor efficiency in a plant for spraying water to the intake of a compressor by spraying water from plural places through sprayers provided in a remote place from the compressor and in a near place. SOLUTION: Air introduced into a gas turbine 8 is introduced first through a filter 2 into an intake chamber 1 and mixed with water drops jetted from a sprayer 3. The water drops enter a compressor 7 through a silencer 4, but in its midway, intake is cooled by evaporation of the water drops and the water drops which are not evaporated are sent to the compressor 7. The intake passed through the silencer 4 is again mixed with water drops from a sprayer 5, but the water drops are evaporated at a lower ratio before the compressor 7 and mostly enter the compressor 7 to be evaporated in the compressor 7. The spary water is supplied from the outside, and stored in a tank through a filter 9 and a desalting device 10, and then supplied to the respective sprayers 3, 5 by pumps 14, 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a gas turbine plant for generating electric power and power having a gas turbine.
It has the function of spraying water before the compressor and cooling the working fluid (air) of the gas turbine before and after the inlet of the compressor to increase the output. It relates to water treatment of water and angle setting of variable vane vanes of a compressor.

[0002]

2. Description of the Related Art In recent years, gas turbines for generating electric power and power have been widely used in combined cycle systems, coal gasification power generation systems, and the like.

However, in a gas turbine, when the intake air temperature in summer increases, the air density decreases and the intake air mass decreases, but the compression work of the compressor does not change significantly because the intake air volume does not decrease. . Therefore, there is a phenomenon that the output of the gas turbine is greatly reduced. As a result, the gas turbine output in summer is 85 to 85 in winter.
It is reduced to about 80%.

On the other hand, except for the Hokkaido region, the peak of the power demand throughout the year occurs during the daytime in summer. However, when the maximum output is desired, the output of the gas turbine is greatly reduced. As the number of installations increases, the impact on the power supply capacity is becoming greater.

[0005] Various techniques have been conventionally proposed to reduce the output when the most output is desired. Many of these proposals are for cooling the intake of a gas turbine to restore output.

Conventionally, methods for cooling the intake air of a gas turbine include a method of cooling with the heat of evaporation of LNG as fuel, a method of making ice with nighttime electric power and cooling with the heat of melting, and a method of cooling with liquid air. Using the thermal energy of the gas discharged from the method of spraying water and the waste heat recovery heat exchanger as a heating heat source of the absorption cooling subsystem,
A method utilizing cold heat from this system is known. Among these methods, the method of spraying water may be most advantageously constructed in terms of cost.

[0007]

However, the method of injecting water into the intake air has some problems described below.

If water evaporates and the temperature of the working air drops in the middle of the compressor, the working air volume decreases from there, and the output of the gas turbine plant increases by reducing the compressor driving power. .
However, the increase in the intake mass of the working air itself is small,
A large amount of spray water is required to greatly increase the output by water spray. On the other hand, if the intake air is cooled before entering the compressor, it directly leads to an increase in the intake mass. If the intake mass increases, the output tends to increase.

Therefore, if the sprayed water is evaporated in front of the compressor, the heat of evaporation can cool the intake air. Therefore, it is important to reduce the temperature by evaporative cooling as much as possible to intake air to the compressor entrance. However, water vapor has a saturation amount, and water droplets are difficult to evaporate as water vapor saturation is approached. Therefore, it is necessary to make the water droplets evaporate as easily as possible before the entrance of the compressor.

Further, if the amount of air blown from the moving blade on the inlet side of the compressor is increased in order to increase the suction mass at the time of water spraying, it naturally contributes to the increase of the output at the time of water spraying. However, when the water spray is not performed, it is necessary to throttle the inlet guide vanes even at the full load, and the efficiency of the compressor is reduced and the thermal efficiency of the gas turbine is also reduced.

In the case of a combined cycle system, an increase in the amount of intake air directly leads to an increase in the output of the steam turbine. Therefore, cooling the intake air before the compressor to increase the intake mass is of great significance for increasing the output of the combined cycle system as a whole.

In the method of spraying water into the intake air, dissolved matter such as metal ions typified by Ca ions contained in the water, particularly Ca ions, becomes fine particles as the water droplets evaporate, forming fine particles of the compressor blade. Adheres as a scale on For example, if the spray water contains 10 mg of a sedimentary substance in one liter, when 1% of the mass of the water is sprayed when the intake air is 650 kg / sec, 234 in one hour.
g of sedimentary material is inhaled. Some of them are deposited.

The deposits in the compressor can be removed by opening the casing, but it is difficult to remove the deposits with the casing closed. The casing is only opened during periodic inspections, and this operation is a large operation that requires days and is not normally performed. If the deposits are present on the compressor blades, the efficiency of the compressor is reduced and a predetermined output cannot be achieved. The deposited material in the compressor includes fine particles, silica and the like in addition to the above. Therefore, a water treatment apparatus that makes the sprayed water more pure (meaning closer to pure water in the present application) is required, and the cost for this is added.

[0014] Water droplets also have an adverse effect on the corrosion of compressor blades. Therefore, it is not preferable to always put water droplets into the compressor from the viewpoint of performance.

Accordingly, the present application relates to a gas turbine plant for spraying water to a compressor intake air, and to improvements in respective methods of cooling and operating the intake air.

[0016]

According to the present invention, a compressor for compressing air, a gas turbine which receives compressed air from the compressor, burns fuel, and is driven by the combustion gas, and generates power of the gas turbine by electric power or the like. In a gas turbine plant that sprays water into the intake air of a compressor, the gas turbine plant has multiple locations where water is sprayed, compares the spray location with the location where the sprayed water droplets evaporate, and evaporates before the compressor. The water droplets that cool the intake air by heat absorption at that time consist mainly of water droplets sprayed at places far from the compressor, while the water droplets evaporated inside the compressor mainly consist of water droplets sprayed at places near the compressor. A gas turbine plant characterized by the above.

The water sprayed at a location far from the compressor tends to evaporate before entering the compressor because of its long residence time. When evaporated, the intake air can be cooled before entering the compressor. On the other hand, water droplets mainly evaporated in the compressor are sprayed at a location close to the compressor, so that there is little loss attached to the wall surface before reaching the compressor. Claim 1 is characterized in that uses are classified into applications in which the solvent evaporates in front of the compressor and the other uses in which the solvent evaporates in the compressor. However, since it is impossible to ideally control the particle size of the water droplet to be sprayed and the spread in the intake air, the functions of the particles slightly overlap.

When spraying at a location far from the compressor, it is preferable that silencers are present downstream of the spray. In other words, it is preferable to have a gas-liquid contact promoting function. This is because the spray water gets wet with the silencer and becomes easier to vaporize. In this case, the silencers serve as a filler for gas-liquid contact in a chemical plant. The silencer wet with the spray water can be dried by the operation when the water spray is stopped.

According to a second aspect of the present invention, the compressor comprises a compressor for compressing air, a gas turbine which receives compressed air from the compressor, burns fuel, and is driven by the combustion gas, and a device for converting generated power of the gas turbine into electric power or the like. In a gas turbine plant that sprays water into the intake air of a compressor, a spray section (nozzle) having different average particle diameters of water droplets to be sprayed is provided. The water droplets that cool the intake air due to heat absorption mainly consist of the water droplets from the spray part with the smaller average particle diameter, while the water droplets evaporated in the compressor are mainly the water droplets with the larger average particle diameter. The gas turbine plant comprises water droplets from a part (nozzle).

For evaporating water droplets, the smaller the particle size, the better. Further, the water evaporated in the compressor evaporates quickly as the temperature rises therein. Therefore, it is preferable that the diameter of the water droplet sprayed to the inlet of the compressor is small, but it does not reach an absolutely necessary condition. Then, in claim 2, the diameter of the water droplet mainly evaporated and used for cooling the intake air is made smaller. In this case, the positions of the spray units (nozzles) may be the same. The particle size of the water droplet is based on the Sauter mean particle size determined by a laser method.

The method of spraying water generally includes (1)
There are a method of spraying pressurized water, (2) a method of spraying by mixing compressed water and compressed air, and (3) a method of spraying compressed air and sucking water to spray. The methods (2) and (3) using compressed air are generally advantageous for obtaining a small water droplet diameter, and using pressure water to obtain a large spray amount (1).
The method (2) is generally advantageous. On the other hand, from the viewpoint of equipment cost, the method (1) using only the pressurized water is structurally simple and advantageous in cost.

According to a third aspect of the present invention, there are provided a compressor for compressing air, a gas turbine driven by the combustion gas by receiving fuel from the compressor and burning the fuel, and a device for converting generated power of the gas turbine into electric power. In an intake air cooling method for a gas turbine plant that sprays water on the intake air of a compressor, at the peak of power demand on the first day of summer, water is sprayed on the intake air of the compressor, and the heat of the evaporation before entering the compressor is used to reduce the temperature of the intake air. Lowering and further evaporating in the compressor to reduce the temperature of the working air, while before and / or after this peak time the water evaporating in the compressor (substantially)
The method comprises a method of cooling the intake air of a gas turbine plant, wherein the method is stopped.

In other words, the effect of lowering the temperature of the intake air before entering the compressor is the basis of intake air cooling. Here, the basis is that the operation time is long, and the effect is not necessarily large. In other words, the action of lowering the temperature of the intake air before entering the compressor is performed for a long time, and the action of evaporating in one compressor is performed for a shorter time.

[0024] By using the effect of lowering the temperature of the intake air before entering the compressor as the basis of the intake air cooling, the amount of intake air entering the compressor can be increased. Great effect.

According to a fourth aspect of the present invention, there are provided a compressor for compressing air, a gas turbine which receives compressed air from the compressor, burns fuel, and is driven by the combustion gas, and a device for converting generated power of the gas turbine into electric power. In a gas turbine plant intake cooling method that sprays water on the compressor intake, water is sprayed on the compressor intake at a time centered on peak power demand in the daytime in summer, while water is sprayed on the compressor intake at night. The water treatment that substantially stops and reduces the sedimentary substances in the compressor of the sprayed water is performed during the daytime and at night, and the nightly treated water is temporarily stored and used for daytime spraying. And a method of cooling the intake air of a gas turbine plant.

By spraying water in which the amount of sedimentary substances in the compressor has been reduced only during the peak hours in the daytime and before and after the peak time, sediments in the compressor can be reduced as much as possible. Furthermore, by operating the water treatment apparatus for reducing the sediment in the compressor during the daytime and nighttime, and storing purified water for the nighttime operation and using it during the next day, the treatment capacity of this apparatus can be minimized. Therefore, the influence on the total plant cost can be reduced.

According to a fifth aspect of the present invention, the compressor comprises a compressor for compressing air, a gas turbine receiving compressed air from the compressor, burning fuel and driving the combustion gas, and a device for converting generated power of the gas turbine into electric power. In a gas turbine plant intake cooling method that sprays water on the compressor intake, water is sprayed on the compressor intake at a time centered on peak power demand in the daytime in summer, while water is sprayed on the compressor intake at night. Is substantially stopped, and the water treatment for reducing the sedimentary metal ions in the compressor of the sprayed water is performed during the daytime and nighttime, and the nightly treated water is temporarily stored and used for daytime spraying. The method comprises an air cooling method for a gas turbine plant.

Since metal ions represented by Ca ions have a depositing property, the amount of deposits in the compressor can be reduced by spraying as much water as possible on the intake air.

According to a sixth aspect of the present invention, there are provided a compressor for compressing air, a gas turbine which receives compressed air from the compressor, burns fuel, and is driven by the combustion gas, and a device for converting generated power of the gas turbine into electric power or the like. In a method of operating a gas turbine plant that sprays water into the intake air of a compressor, the method includes the steps of: The method comprises operating the gas turbine plant by lowering the output and then changing the set angle of the inlet guide vanes of the gas turbine to lower the output.

When the power demand is reduced and the output is reduced, the output is generally reduced by changing the set angle of the inlet guide vanes of the gas turbine. However, this operation greatly reduces the thermal efficiency. Then, in claim 6, after stopping water spraying first, the next entrance guide wing is squeezed. This allows
The amount of water spray can be reduced. Therefore, the amount of deposits in the compressor can be reduced. Further, by performing the operation of the compressor inlet guide vane (also referred to as IGV) later, it is possible to reduce a decrease in thermal efficiency during the operation and save fuel during the operation.

The contents are shown in Table 1 with reference to FIG. FIG. 4 shows the power demand on the first day of summer as an index. The peak demand is around 15:00 and has been declining since then. Table 1 is an example. In this table, the output is reduced stepwise from 16:00 to 23:00. The method of reduction is to first stop the water spray gradually, and then the output is reduced by the operation of the entrance guide vane. Thereby, the total amount of the water spray can be reduced.

Table 2 is an example. In this table, a pattern in which the effect of water spray is divided into two stages is incorporated. 100
The% output consists of the effect of water evaporation before the compressor and the effect of water evaporation inside the compressor. The other 9
0% power consists solely of the effect of water evaporation before the compressor.

Table 3 is a comparative example. The patterns in Table 3 have a large amount of water spray and are disadvantageous for deposition in the compressor. Since the relationship between the time and the output in Tables 1 to 3 is related to the operation of other power plants, it is not simply proportional to the time and the demand in FIG.

According to a seventh aspect of the present invention, the compressor comprises a compressor for compressing air, a gas turbine which receives compressed air from the compressor, burns fuel, and is driven by the combustion gas, and a device for converting generated power of the gas turbine into electric power or the like. In a method of operating a gas turbine plant having a function of spraying water into the intake air of a compressor, the compressor inlet guide vanes and a vane angle variable vane at a location where the spray water evaporates are used as means for adjusting the compressor flow rate. At the time of full load when evaporating the spray water in the inside, the angle of the compressor inlet guide vane and the blade angle variable vane are adjusted to increase the flow velocity of the compressor inlet intake air. Sometimes,
The method for operating a gas turbine plant is characterized in that the blade angle variable vane is set at an inclination angle different from the above, and set at an angle that increases the working air compression pressure at that point.

In a gas turbine compressor,
When the mist evaporates, the working fluid (air) is cooled, whereby the volume in comparison with the same pressure is reduced, and the power for driving the compressor is reduced and the output is increased. However, since the flow rate (mass) of the working air is almost proportional to the air density up to the compressor inlet, the flow rate in summer is smaller than in winter.

In order to improve this, it is necessary to increase the flow rate of the portion of the compressor where water droplets evaporate. In order to increase the flow rate, the moving blade capacity of about 1 to 3 stages on the compressor inlet side is increased.

However, this increase in capacity is effective when combined with water spraying, but when water spraying is not performed, excessive air is sent, which causes troubles such as surging. Therefore, it is necessary to reduce the compressor flow rate. . However, reducing the flow rate at the entrance guide vanes increases intake resistance, lowers thermal efficiency and results in fuel loss.

In order to prevent the loss, for example, when water is not sprayed, the angle of the first stage stationary blade is made variable, and this angle is adjusted in the direction in which the pressure increases, so that the force for feeding air is increased. Change to ascending. By performing this operation, the compressor flow rate can be reduced. The loss can be reduced as compared with the case of squeezing with the entrance guide wing.

FIG. 3 is a diagram for explaining claim 7 as well. By changing the blade angle of the variable inlet guide vanes 43 and / or the vane angle variable vanes (first stage vanes) 44, the speed or flow rate fed to the compressor can be changed.
In the case of a full load in which the spray water does not evaporate in the compressor, the angle of the first-stage stationary blade is made variable, and this angle is adjusted in a direction in which the pressure increases to reduce the loss when the compressor flow rate is reduced.

The variable inlet guide vanes 43 can adjust the compressor flow rate in a wide range, but a loss occurs when the flow rate is reduced. On the other hand, if the angle of the first stage stationary blade is variable, the range in which the compressor flow rate can be adjusted is small, but the loss is small. The angle setting of the vane angle variable vane may be performed according to the conditions in one day in summer, or may be performed at the boundary between summer and other seasons.

The gas turbine plant in the present application is a gas turbine system including a compressor, a gas turbine, a generator, and the like. The waste heat recovery heat exchanger (boiler) using the waste heat of the gas turbine, the steam When a turbine is provided, it refers to a plant including the turbine.

According to the eighth aspect of the present invention, the compressor comprises a compressor for compressing air, a gas turbine receiving compressed air from the compressor, burning fuel and driving by the combustion gas, and a device for converting generated power of the gas turbine into electric power. 2. Description of the Related Art A gas turbine plant that sprays water into the intake air of a compressor is characterized by spraying distilled water during a time zone centered on peak power demand in the daytime in summer. By spraying water consisting of distilled water, the amount of deposits in the compressor can be reduced. In addition, it is preferable that the spraying of distilled water is reduced or substantially stopped in time periods other than the above. It is preferable that the distilled water is temporarily stored in a tank and then sprayed in a concentrated manner since the distillation apparatus capacity can be reduced.

According to a ninth aspect of the present invention, there are provided a compressor for compressing air, a gas turbine which receives compressed air from the compressor, burns fuel, and is driven by the combustion gas, and a device for converting generated power of the gas turbine into electric power. In a gas turbine plant that sprays water into the intake air of a compressor, the water sprayed into the intake air of the compressor consists of water that has been distilled by utilizing waste heat of the gas turbine during operation. Become. By utilizing the waste heat of the gas turbine for the distillation of the spray water, no new thermal energy is required for the distillation.

According to a tenth aspect of the present invention, there are provided a compressor for compressing air, a gas turbine which receives compressed air from the compressor, burns fuel, and is driven by the combustion gas, and a device for converting generated power of the gas turbine into electric power. In a gas turbine plant intake air cooling method that sprays water into the compressor intake, water is sprayed into the compressor intake during a time period centered on peak power demand in the daytime in summer, and before and after that, water into the compressor intake is sprayed. Spraying is reduced or substantially stopped from peak power demand, and the water sprayed to the compressor intake is composed of water distilled by utilizing waste heat while the gas turbine is operating. And a method of cooling the intake air of a gas turbine plant. By further restricting the spraying time by using the water sprayed on the intake air of the compressor as distilled water, the accumulation on the compressor blades and the corrosion of the blades are minimized.

According to the eleventh aspect, the compressor comprises a compressor for compressing air, a gas turbine which receives compressed air from the compressor, burns fuel, and is driven by the combustion gas, and a device for converting generated power of the gas turbine into electric power or the like. ,
In a gas turbine plant that sprays water into the intake air of a compressor, it has a heat exchanger that recovers waste heat from the gas turbine, extracts steam from the path that heats the water supplied to the steam turbine, and uses this steam to perform multistage distillation of water. And a gas turbine plant characterized in that the water sprayed on the intake air of the compressor consists of this multistage distilled water. The steam supplied to the steam turbine has a temperature of 100 ° C. or higher and can be used for multi-stage distillation. Energy loss is reduced by multi-stage distillation.

According to a twelfth aspect, the compressor comprises a compressor for compressing air, a gas turbine which receives compressed air from the compressor, burns fuel, and is driven by the combustion gas, and a device for converting generated power of the gas turbine into electric power or the like. ,
In a gas turbine plant that sprays water into the intake air of a compressor, it has a heat exchanger that recovers waste heat from the gas turbine, takes out hot water from a path that heats the water supplied to the steam turbine, and performs multi-stage distillation of water with this hot water And a gas turbine plant characterized in that the water sprayed on the intake air of the compressor consists of this multistage distilled water. Energy loss is reduced by multi-stage distillation.

According to the thirteenth aspect, the compressor comprises a compressor for compressing air, a gas turbine which receives compressed air from the compressor, burns fuel, and is driven by the combustion gas, and a device for converting generated power of the gas turbine into electric power or the like. ,
In a gas turbine plant that sprays water into the intake air of a compressor, it has a heat exchanger that recovers waste heat from the gas turbine, heats the water with the exhaust gas that heats the water supplied to the steam turbine, and takes out hot water. A gas turbine plant, wherein the water to be sprayed into the intake of the compressor comprises the single-stage distilled water. The exhaust gas heated water supplied to the steam turbine has a low temperature, but has a large calorific value, and thus can receive a large amount of heat without forcibly multistage distillation. Therefore, the distillation apparatus is simplified as a single-stage distillation method.

According to a fourteenth aspect, the compressor comprises a compressor for compressing air, a gas turbine driven by the combustion gas by receiving fuel from the compressor and burning the fuel, and a device for converting the power generated by the gas turbine into electric power or the like. ,
In a gas turbine plant that sprays water into the intake air of a compressor, the intake air of the gas turbine is first cooled, mist is generated during this cooling, and the waste heat is used to distill the mist-containing intake air while the gas turbine is operating. A gas turbine plant is characterized by spraying water droplets composed of treated water and evaporating both mist generated during cooling and water droplets composed of distilled water in a compressor. Since water is sprayed after cooling the intake of the gas turbine, the amount of water spray can be reduced by comparing the amount of water spray with the same effect. Therefore, corrosion of the compressor blade and deposits on the compressor blade can be reduced.

[0049]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment corresponding to claims 1 to 5. The air entering the gas turbine 8 is supplied to the intake chamber 1
Then, water droplets are mixed by the atomizer 3 through the filter 2. The atomizer is a two-fluid mixed spray type of water and air. The average particle size of the sprayed water particles is 20-30 microns.
The water drops enter the compressor via the silencer, but on the way, the water drops mainly evaporate to cool the intake air. The portion that does not evaporate is sent to the compressor 7. Spraying is performed with a high density and biased upward. Although the silencer is wet with the spray water, the amount of evaporation can be further increased since the silencer can also evaporate on the wet surface.

The intake air having passed through the silencer is again mixed with water droplets by the atomizer 5. In this figure, the sprayer is a water pressurized spray type, but may be a two-fluid mixed spray type. The average particle size of the sprayed water particles is in this case 50-70 microns. These water droplets evaporate less before the compressor, enter the compressor and evaporate in the compressor. Water adhering to the walls of the intake chamber 1 and the intake plenum 6 is collected and sprayed again. In the case of full load in summer, the spray amount from the sprayer 5 is larger than the spray amount from the sprayer 3 from the sprayer 5.

The water to be sprayed is supplied from the outside and stored in a tank through a filtration device 9 and a desalination device 10 (device for removing metal ions such as Ca). Compressor Deposits contaminants and dissolved matter are reduced and supplied to the nebulizer. It is preferable that these filtration devices and desalination devices be operated 24 hours a day during peak periods of electric power demand in summer, while the spraying time is preferably several hours a day.

FIG. 2 is a diagram for explaining claim 6. The water for spraying is sent from the outside, and the filtration device 25, the desalination device 2
After passing through 6, the water is further purified and temporarily stored in the tank 27.
The water discharged from the tank 27 is sent to the first to fourth gas turbine plants. The first to fourth gas turbine plants each include a gas turbine plant provided with a water atomizer in front of the compressor entrance. These plants may be provided with a waste heat recovery heat exchanger (boiler) and a steam turbine that generates power using the steam. Table 1 shows the status of water spray and output patterns in these plants.

FIG. 3 shows an embodiment corresponding to claim 7.
It is an example of the arrangement of the moving blade and the stationary blade of the compressor. A rotor blade is provided on the shaft side 41, and a stationary blade is a portion partially buried in a casing. At the entrance, there is a variable compressor entrance guide vane 43.

FIG. 5 shows an embodiment corresponding to the eighth, ninth, tenth, and thirteenth aspects. The air entering the gas turbine 58 passes through a filter 52 in an intake chamber 51, and is mixed with water droplets of distilled water in a sprayer 53. The atomizer is a two-fluid mixed spray type of water and air. The water drops enter the compressor 57 via the silencer 54, but on the way, the water drops evaporate somewhat to cool the intake air. The part that does not evaporate is the compressor 57
Send to Although the silencer 54 is wet with the spray water, the amount of evaporation can be further increased because the silencer 54 can also evaporate on the wet surface. Before entering the compressor 57, the sprayer 55 sprays water droplets of distilled water. These water droplets evaporate on the wing near the inlet of the compressor 57. The cooling heat at this time suppresses the rise in air temperature and reduces the driving power of the compressor. This increases the output of the gas turbine plant. The fuel that has exited the compressor 57 is charged with fuel and burned, and enters the gas turbine 58. The combustion gas expands in the gas turbine 58 to generate an output. The waste gas discharged from the gas turbine enters the waste heat recovery heat exchanger 59, generates steam, and drives the steam turbine. Heat is taken out from the low-temperature side of the waste heat recovery heat exchanger 59, and this heat is used by the still 61 for water distillation. The distilled water is stored in a tank 62 and is sprayed into the intake air from the sprayers 53 and 55. Since distilled water has no dissolved matter, even when used for spraying, it hardly produces any deposits when it evaporates in the compressor. The distillation pipe in the waste heat recovery heat exchanger 59 is shared with the pipe for the steam turbine, and the distillation is multistage distillation. A case where the piping is arranged closer to the stack 60 than the piping for the steam turbine corresponds to claim 13.

FIG. 6 shows an embodiment corresponding to the eighth, ninth, tenth, eleventh and fourteenth aspects. Air entering the gas turbine 78 passes through a filter 72 in an intake chamber 71 and passes through a cooler 73.
Cooled by. During cooling, mist is generated and mixed with the intake air. The mist enters the compressor 77 via the silencer 74, and water droplets are added by a sprayer 75 on the way. These water droplets evaporate mainly in the compressor 77.
Fuel is put into the air leaving the compressor 77 and burned,
Enter the gas turbine 78. The combustion gas is gas turbine 78
To generate an output. The waste gas discharged from the gas turbine 78 enters the waste heat recovery heat exchanger 79 to generate steam and drive the steam turbine. Steam is taken out from the low temperature side of the waste heat recovery heat exchanger 79, and the heat of this steam is used for distillation of water in the multi-stage distillation unit 82. The distilled water is stored in a tank 83, and is sprayed from an atomizer 75 into the intake air. Since distilled water has no dissolved matter, even when used for spraying, it hardly produces any deposits when it evaporates in the compressor.

FIG. 7 shows a multi-stage distillation unit according to the eleventh aspect. The steam from the waste heat recovery heat exchanger evaporates and condenses the feed water in the evaporator / condenser 91. The condensed water returns to the waste heat recovery heat exchanger. Evaporation and condenser 91 to 92,
The evaporation pressure is reduced in the order of 93 and 94. Also, the condensation pressure and the condensation temperature decrease in the same order. Evaporation and condenser 91
The supply water that has not evaporated in the above is sprayed in the next evaporation and condenser 92. During this spraying, the pressure in the vessel is lower than before. It is to be noted that, when spraying more vigorously, evaporation becomes easier, but for this purpose, pressure may be applied by a pump. The feed water evaporates at a reduced pressure. Such a multi-stage evaporator / condenser evaporates the supply water when the evaporated water vapor is condensed, so that the consumption of the heating steam is small.

In the above embodiment, a regulating valve and a pump can be newly provided as needed.

The water distilled using the waste heat of the gas turbine can of course be used for spraying water to the compressor intake of another gas turbine plant.

Further, the distilled water to be sprayed does not prevent mixing of non-sedimentary substances for the purpose of use. Of course, it is important that the influence on the gas turbine performance is small.

The technology of this application can be used within the technical scope of any system having a gas turbine. For example, a coal gasification power generation system (IGCC). “Not used” in Tables 1 and 2 means that the condition did not match, and the pattern is used depending on the condition.

[0061]

As described above, in a gas turbine plant that sprays water into the intake air, (1) the intake air temperature can be significantly reduced by heat of evaporation before entering the compressor. (2) The sediment in the compressor can be reduced as much as possible and the cost of water treatment can be reduced. (3) A decrease in compressor efficiency when water is not sprayed can be prevented.

[Brief description of the drawings]

FIG. 1 is an embodiment.

FIG. 2 is a diagram for explaining claim 6;

FIG. 3 is an embodiment and is a partial cross-sectional view of a compressor.

FIG. 4 is an example of power demand (index) on the first day of summer.

FIG. 5 is an embodiment.

FIG. 6 is an embodiment.

FIG. 7 is in the form of a multi-stage distillation unit.

[Explanation of symbols]

1,51,71 Intake chamber 2,52,72 Filter 3,5,53,55,75 Atomizer 4,54,74 Silencer 6,56,76 Intake plenum 7,57,77 Compressor 8,58,78 Gas turbine 9 , 25 Filtration device 10, 26 Desalination device 11, 27, 62, 82 Tank 12-15, 28-30, 63-65, 84-85, 9
9-102 Pump 16-18, 31-34, 86, 103-105 Regulator 21 No. 1 gas turbine plant 22 No. 2 gas turbine plant 23 No. 3 gas turbine plant 24 No. 4 gas turbine plant 41 Shaft side 42 Casing 43 Compressor inlet guide vane 44 Blade angle variable vane 45 First stage moving blade 46 Second stage moving blade 59, 79 Waste heat recovery heat exchanger 61 Distiller 73 Cooler 82 Multistage distillation unit 95 Deaerator

Claims (14)

[Claims] 1. A compressor for compressing air, a gas turbine receiving compressed air from the compressor and burning fuel to drive the combustion gas, and a device for converting generated power of the gas turbine into electric power or the like. In a gas turbine plant that sprays water into the intake air, it has multiple locations where water is sprayed, compares the spray location with the location where the sprayed water droplets evaporate, evaporates in front of the compressor, and absorbs heat using the heat absorption at that time. A gas turbine plant characterized in that the water droplets for cooling are mainly composed of water droplets sprayed at a location far from the compressor, while the water droplets evaporated in the compressor are mainly composed of water droplets sprayed at a location close to the compressor. 2. A compressor for compressing air, a gas turbine which receives compressed air from the compressor, burns fuel, and is driven by the combustion gas, and a device for converting generated power of the gas turbine into electric power or the like. In a gas turbine plant that sprays water into the intake air, it has a spray section (nozzle) with different average particle diameters of water droplets sprayed, and compares the average particle diameter with the position where the water droplets evaporate,
The water droplets that evaporate and cool the intake air by heat absorption at that time mainly consist of water droplets from the spray part with the smaller average particle size,
On the other hand, the gas turbine plant is characterized in that the water droplets evaporated in the compressor mainly consist of water droplets from a spray portion (nozzle) having a larger average particle diameter. 3. A compressor for compressing air, a gas turbine receiving compressed air from the compressor, burning fuel and driving the combustion gas, and a device for converting power generated by the gas turbine into electric power. In the method of cooling the intake air of a gas turbine plant that sprays water, at the peak of power demand on the first day of summer, water is sprayed on the intake of the compressor, and the heat of evaporation reduces the temperature of the intake before entering the compressor. Furthermore, it evaporates in the compressor and lowers the temperature of the working air,
On the other hand, before and / or after the peak time, the air cooling method for a gas turbine plant, wherein the water evaporated in the compressor is stopped. 4. A compressor that compresses air, a gas turbine that receives compressed air from the compressor, burns fuel, and is driven by the combustion gas, and a device that converts power generated by the gas turbine into electric power. In the cooling method of the gas turbine plant, the water is sprayed on the compressor intake at a time centered on the peak power demand in the daytime in summer, while the water is substantially sprayed on the compressor intake at night. The water treatment is performed during the daytime and at night, and the water treated during the night is temporarily stored and used for daytime spraying. A method of cooling the intake of a turbine plant. 5. A compressor for compressing air, a gas turbine which receives compressed air from the compressor, burns fuel, and is driven by the combustion gas, and a device for converting power generated by the gas turbine into electric power. In the cooling method of the gas turbine plant, the water is sprayed on the compressor intake at a time centered on the peak power demand in the daytime in summer, while the water is substantially sprayed on the compressor intake at night. The water treatment for reducing the sedimentary metal ions in the compressor of the water to be sprayed and sprayed is performed during the daytime and nighttime, and the nightly treated water is temporarily stored and used for daytime spraying. Method of cooling the intake air of a gas turbine plant. 6. A compressor that compresses air, a gas turbine that receives compressed air from the compressor, burns fuel, and is driven by the combustion gas, and a device that converts power generated by the gas turbine into electric power or the like. In the method of operating a gas turbine plant that sprays water into the intake air, when multiple gas turbine plants are used and the total output of all plants is reduced gradually, the water spray is first stopped to reduce the gas turbine output. And then changing the set angle of an inlet guide valve of the gas turbine to reduce the output, thereby operating the gas turbine plant. 7. A compressor for compressing air, a gas turbine which receives compressed air from the compressor, burns fuel, and is driven by the combustion gas, and a device for converting generated power of the gas turbine into electric power or the like. In an operation method of a gas turbine plant having a function of spraying water into intake air, as a means for adjusting a compressor flow rate, a compressor inlet guide vane and a vane angle variable vane at a location where spray water evaporates, and spraying is performed in the compressor. At full load when evaporating water, the angle of the compressor inlet guide vanes and vane angle variable vanes are adjusted to increase the flow velocity of the intake air at the compressor inlet. The variable angle vane has a different inclination angle from the above, and the working air compression pressure at that point is increased. The method of operating a gas turbine plant and setting the angle that. 8. A compressor for compressing air, a gas turbine receiving compressed air from the compressor, burning fuel and driving the combustion gas, and a device for converting generated power of the gas turbine into electric power. A gas turbine plant that sprays water that has been subjected to a distillation treatment in a time zone centered on peak demand for power in the daytime in summertime. 9. A compressor for compressing air, a gas turbine receiving compressed air from the compressor, burning fuel and driving the combustion gas, and a device for converting power generated by the gas turbine into electric power. A gas turbine plant that sprays water onto a gas turbine, wherein the water sprayed onto the intake air of the compressor comprises water that has been subjected to a distillation treatment by utilizing waste heat thereof while the gas turbine is operating. 10. A compressor that compresses air, a gas turbine that receives compressed air from the compressor, burns fuel, and is driven by the combustion gas, and a device that converts power generated by the gas turbine into electric power. In the cooling method of the intake air of a gas turbine plant, water is sprayed on the compressor intake during a time zone around the peak power demand in the daytime in summer, and before and after that, water is sprayed on the compressor intake before and after. A gas characterized in that the water which is reduced or substantially stopped from the peak of the power demand and which is sprayed on the intake air of the compressor is composed of water distilled by utilizing waste heat thereof while the gas turbine is operating. A method of cooling the intake of a turbine plant. 11. A compressor which compresses air, a gas turbine which receives compressed air from the compressor, burns fuel, and is driven by the combustion gas, and a device which converts power generated by the gas turbine into electric power or the like. In a gas turbine plant that sprays water into the intake,
It has a heat exchanger that recovers the waste heat of the gas turbine, extracts steam from the path that heats the water to be supplied to the steam turbine, performs multi-stage distillation of the water with this steam, and sprays the water into the intake of the compressor. A gas turbine plant comprising distilled water. 12. A compressor that compresses air, a gas turbine that receives compressed air from the compressor, burns fuel, and is driven by the combustion gas, and a device that converts power generated by the gas turbine into electric power or the like. In a gas turbine plant that sprays water into the intake,
It has a heat exchanger that recovers the waste heat of the gas turbine, takes out hot water from the path that heats the water to be supplied to the steam turbine, multi-stages distillation of the water with this hot water, and sprays the water into the compressor intake. A gas turbine plant comprising distilled water. 13. A compressor that compresses air, a gas turbine that receives compressed air from the compressor, burns fuel, and is driven by the combustion gas, and a device that converts power generated by the gas turbine into electric power or the like. In a gas turbine plant that sprays water into the intake,
It has a heat exchanger that recovers the waste heat of the gas turbine, heats the water with the exhaust gas that heats the water supplied to the steam turbine, takes out hot water, performs single-stage distillation of the water with this hot water, and uses it as the intake air for the compressor. A gas turbine plant wherein the water to be sprayed comprises the single-stage distilled water. 14. A compressor that compresses air, a gas turbine that receives compressed air from the compressor, burns fuel, and is driven by the combustion gas, and a device that converts the power generated by the gas turbine into electric power or the like. In a gas turbine plant that sprays water into the intake,
First, the intake air of the gas turbine is cooled, mist is generated at the time of this cooling, and water droplets composed of water distilled by using the waste heat during the operation of the gas turbine are sprayed on the intake air containing the mist, and the mist is generated in the compressor. A gas turbine plant for evaporating both mist generated during cooling and water droplets composed of distilled water.