JP2000320308A - Method and device for effective use of steam for steam injection-type gas turbine cogeneration - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively use excess steam, in a thermoelectric ratio variable-type cogeneration system in a specified electric industry which is under obligation to supply all amount of electric power load of a region. SOLUTION: In steam injection-type gas turbine cogeneration, steam recovered by an exhaust heat boiler 22 of a plurality of steam injection-type gas turbines 10 arranged in parallel is partially injected to a combustor 18 to increase the power generation amount, and remaining steam is depressurized for heat utilization. A back pressure steam turbine 52 is provided on a depressurizing line for steam, and steam to be heat-utilized is introduced into the back pressure steam turbine 52, to generate electric power and recover power.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and an apparatus for effectively using steam (steam) in a steam injection type gas turbine cogeneration system.

[0002]

2. Description of the Related Art The Electricity Business Law has been amended to enable a specific electric business to supply electric power to specific areas at a lower cost than electric power companies. In order to supply electricity at a lower cost than a power company with a small-scale power generation facility, it is essential to introduce not only power supply but also heat supply simultaneously with the introduction of a cogeneration system with high energy use efficiency. . As a system for supplying electric power and heat, gas turbine cogeneration becomes general as the scale increases. The ratio between the electric power load and the heat load (cooling load, heating load, hot water supply load, etc.) in the area changes every day in the span of one day, and also changes depending on the season. In order to cope with the changing heat-to-electric ratio while supplying the entire power load of the region, introduce a cogeneration system with a variable heat-to-electric ratio such as a steam injection type gas turbine cogeneration or a combined cycle type cogeneration. There is a need.

FIG. 2 shows an example of a conventional steam injection type gas turbine cogeneration system. Reference numeral 10 denotes a steam injection gas turbine, which includes a fuel gas compressor 12, an air compressor 14, a gas turbine 16 coaxially connected to the air compressor, a combustor 18, and a generator 2.
0, waste heat boiler 22, steam supply line 24 for increasing power,
It comprises a NOx reduction steam supply line 26, a process steam line 28, and the like. A plurality of steam injection type gas turbines 10 configured as described above (for example, 5
Groups), are arranged in parallel. 30 is an absorption refrigerator, 32
Is a cooling tower, 34 is a steam boiler, 36a and 36b are hot well tanks, 38 is a water pump (circulation pump), 40 is a drain filter, 42 is a water circulation line, and 44 is a communication pipe.

In a steam injection type gas turbine cogeneration system as shown in FIG. 2, a part of the recovered steam is supplied to the combustor 18. Therefore, the pressure of the recovered steam must be higher than the pressure of the combustor 18. . For example, combustor 1
When the pressure in 8 is 15 kg / cm ² G, it is recovered as a saturated vapor of 17 kg / cm ² G. Part of this steam is injected into the combustor 18 for the purpose of reducing NOx and increasing output. FIG.
In the example, the steam of 12.9 t / h, for example,
2, steam of up to 8 t / h is injected into the combustor 18 and the remainder is used as process steam. When the heat supply business is performed simultaneously, the process steam is generally reduced in pressure to, for example, 8 kg / cm ² G by the pressure reducing valve 46 and used as a heat source of the absorption refrigerator 30 or a heating medium for heating or hot water supply.

[0005] Further, in the specific electricity business, there is an obligation to supply the entire amount of the electric power load in the area, and the cogeneration equipment is operated by electric power and heat. Therefore, the collected steam may become excessive due to fluctuations in the power load and the steam load. Also, surplus steam may be generated when the gas turbine is additionally started when the power load increases in the morning. The problems of this system are as follows. (1) For example, saturated steam of 17 kg / cm ² G is reduced to, for example, 8 kg / cm ² G by a pressure reducing valve, and pressure energy is not effectively used. (2) When the process steam becomes excessive, the steam pressure increases, and the steam is discharged from the relief valve 48 to a flue or the like. However, when live steam is released, white smoke is generated, which is not preferable in urban areas.

For this reason, conventionally, instead of discharging steam from a relief valve 48 to a flue or the like, a process steam line 28 is used.
In some cases, a steam accumulator (not shown) is provided to temporarily store steam and then take it out as needed. The steam accumulator method has the drawback that the cost is increased and a large installation space is required.

The prior art is disclosed in Japanese Patent Application Laid-Open No. 10-22720.
No. 3 discloses that steam discharged from a waste heat boiler is introduced into a power recovery device to perform work directly, and water supplied to the waste heat boiler is preheated by steam reduced in pressure by the operation of the power recovery device. Further, a cogeneration system in which water in a water supply tank for storing water to be supplied to the waste heat boiler is preheated is described.

[0008]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Laid-Open No. 10-2 is disclosed.
In the cogeneration system described in Japanese Patent No. 27203, steam obtained after directly performing work using steam obtained from a waste heat boiler is effectively reused. It does not effectively utilize the surplus process steam generated in the system.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is an object of the present invention to provide a cogeneration system having a variable power-to-heat ratio in a specific electricity business which is obliged to supply the entire amount of electric power load in a region. It is an object of the present invention to provide a method and an apparatus capable of effectively utilizing excess steam in a system.

[0010]

In order to achieve the above object, a method for effectively utilizing steam of a steam injection type gas turbine cogeneration system according to the present invention is directed to a method of exhausting a plurality of steam injection type gas turbines provided in parallel. Part of the steam recovered by the heat boiler is injected into the combustor to increase the amount of power generation, and the remaining steam is decompressed and used for heat. A turbine is provided, and steam using heat is introduced into a back-pressure steam turbine to generate power and recover power.

Further, according to the method of the present invention, a part of the steam collected by a waste heat boiler of a plurality of steam injection type gas turbines provided in parallel is injected into a combustor to increase the power generation amount, and the remaining power is increased. In a steam injection type gas turbine cogeneration system that uses steam for heat, when the process steam for heat becomes excessive, a hot well tank for introducing the excess process steam to the excess steam condenser and storing the boiler feedwater It is characterized in that the water in the inside is circulated as cooling water to an excess steam condenser, and the heat of the excess steam is recovered by the water in the hot well tank.

Further, the method of the present invention is a combination of the above two methods, and a part of the steam recovered by the exhaust heat boilers of a plurality of steam injection type gas turbines provided in parallel is injected into the combustor. In a steam injection type gas turbine cogeneration system that increases the amount of power generation and uses the heat by decompressing the remaining steam, a back-pressure steam turbine is installed in the steam decompression line, and the steam that uses heat is introduced into the back-pressure steam turbine When the process steam for heat becomes surplus, the surplus process steam is introduced into the surplus steam condenser, and the water in the hot well tank for storing the boiler feedwater is cooled. It is characterized by circulating through a surplus steam condenser and recovering the heat of the surplus steam with water in a hot well tank.

The steam effective use system of the steam injection type gas turbine cogeneration system of the present invention increases the power generation amount of a part of the steam collected by the exhaust heat boiler of a plurality of steam injection type gas turbines provided in parallel. In the steam injection type gas turbine cogeneration system that injects the remaining steam into the combustor and uses the heat by reducing the pressure, the steam that uses the heat is introduced into the back-pressure steam turbine to generate power and recover power. A back pressure steam turbine is provided in the steam pressure reducing line so that the pressure reduction can be performed.

Further, the apparatus of the present invention injects a part of the steam recovered by the exhaust heat boiler of a plurality of steam injection type gas turbines provided in parallel to a combustor in order to increase the power generation amount, In a steam injection type gas turbine cogeneration system that uses the remaining steam as heat, the process is performed so that the surplus process steam can be introduced to the surplus steam condenser when the process steam to be used for heat becomes surplus. A surplus steam condenser is provided in the surplus steam line branched from the steam line, and the water in the hot well tank for storing the boiler feedwater is circulated as cooling water to the surplus steam condenser, and the heat of the surplus steam is transferred to the water in the hot well tank. Hot well tank and excess steam condenser so that they can be collected at
It is characterized in that it is connected via a cooling water circulation line equipped with a pump and a filter.

Further, the device of the present invention is a combination of the above two devices, and a part of the steam recovered by the exhaust heat boiler of a plurality of steam injection type gas turbines provided in parallel is used to generate power. In a steam injection type gas turbine cogeneration system that injects fuel into the combustor to increase the pressure and decompresses the remaining steam to utilize heat,
When a back pressure steam turbine is installed in the steam pressure reduction line so that the steam used for heat can be introduced into the back pressure steam turbine to perform power generation and power recovery, and the process steam used for heat becomes excessive A surplus steam condenser is installed in the surplus steam line branched from the process steam line so that surplus process steam can be introduced into the surplus steam condenser, and water in the hot well tank for storing boiler feedwater is used as cooling water. The hot well tank and the excess steam condenser are connected via a cooling water circulation line equipped with a pump and a filter so that the heat of the excess steam can be recovered by the water in the hot well tank by circulating through the excess steam condenser. It is characterized by doing.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below, but the present invention is not limited to the following embodiments and can be implemented with appropriate modifications. FIG. 1 shows an apparatus for effectively utilizing steam of a steam injection type gas turbine cogeneration system according to a first embodiment of the present invention. In FIG. 1, numbers 10-44
The devices or lines indicated by are the same as those shown in FIG. A back pressure steam turbine inlet valve 50 is provided in the process steam line 28, and a back pressure steam turbine 52 is installed downstream of the back pressure steam turbine inlet valve 50. 54 is a bypass line provided with a bypass valve 56.

A surplus steam line 58 branches off from the process steam line 28a downstream of the back-pressure steam turbine, and the surplus steam line 58 is connected to the surplus steam condenser 6.
0 is provided. 62 is a surplus steam condenser inlet valve. A hot well tank 36a stores water to be purified, for example, return water from an area, and steam drain from the absorption refrigerator 30. In this method, boiler water replenishment water is supplied to the hot well tank 36a to lower the water temperature in the tank. The hot well tank 36a and the surplus steam condenser 60 are provided with a water pump (circulation pump).
38 and a cooling water circulation line 64 having a drain filter 40. The return line of the cooling water circulation line 64 is connected to a hot well tank 36b for storing clean water. The condensed water line 66 from the surplus steam condenser 60 is connected to the hot well tank 36a. Instead of providing the two hot well tanks 36a and 36b, it is also possible to divide the inside of one hot well tank into two chambers by partitioning, or to constitute one chamber.

Next, the operation of the steam injection type gas turbine cogeneration system configured as described above will be described in detail with reference to FIG. For example, five steam injection type gas turbine cogeneration systems with a maximum power generation amount of 6500 kW during steam injection are installed, and the number of operating gas turbines, the load factor, and the steam injection amount are changed according to the regional power load. FIG. 1 shows a system for this. For example, 17 collected by the exhaust heat boiler 22
kg / cm ² G of saturated steam, the combustor 1 when the steam load is small
It is injected up to 8 t / h to 8 and used for power generation. When the steam load is large, only NOx reduction steam is injected, and most of the steam is used as process steam. When the steam load is large, the steam boiler 34 backs up.
The steam sent from the gas turbine is reduced in pressure to about 8 kg / cm ² G, and is used as a heat source or a heating medium of the absorption refrigerator 30.

The amount of steam sent from the gas turbine is
In this case, throughout the year, for example, around 10 t / h ~
It changes up to around 40 t / h. Therefore, by installing a back-pressure steam turbine generator 68 (the generator may be an induction generator) that consumes up to 20 t / h in this decompression step, for example, a maximum of 310 kW of electric power can be recovered. You can drive in the daytime throughout the year. Since the amount of steam supplied at night is about 10 t / h, it is impossible to generate power even during operation, so the back pressure steam turbine generator 68 is used at night.
Stops driving. The steam pressure on the low pressure side is controlled, for example, to 8.5 kg / cm ² G by the back pressure steam turbine inlet valve 50, and when the amount of power generation is maximized, the back pressure steam turbine inlet valve 50.
Is fixed, and the amount of steam introduced into the back-pressure steam turbine 52 is limited to, for example, 20 t / h. If the steam load on the low-pressure side further increases, the steam pressure on the low-pressure side falls, so that the bypass valve 56 is opened and controlled to, for example, 8.3 kg / cm ² G. When the steam load on the low-pressure side decreases and the steam pressure rises, the excess steam condenser inlet valve 62 opens and the steam pressure is adjusted to, for example, 9 kg / cm ² G. On the other hand, in steam injection type gas turbine cogeneration,
In addition to the blowdown of the exhaust heat boiler 22, it is necessary to replenish an amount corresponding to steam injected into the combustor 18 of the gas turbine as boiler water. Therefore, the amount of replenishing water at room temperature increases as compared with normal gas turbine cogeneration.

The steam drain of about 80 ° C. returned from the absorption refrigerator 30, the return water of about 60 ° C. returned from the area and the makeup water of boiler water are mixed in the hot well tank 36 a, cleaned through the drain filter 40, Boiler feed pump 7
At 0, water is supplied to the exhaust heat boiler 22 and the steam boiler 34.
In steam injection type gas turbine cogeneration,
Since the amount of replenishment water is large, hot well tanks 36a, 36
The warm water in b is maintained at 45 ° C to 55 ° C. In particular, in the middle season when the steam load is likely to decrease and excess steam is likely to be generated, the temperature of the hot water in the hot well tank is maintained at about 45 ° C. In addition, the amount of hot water in the hot well tank is, for example, about 25 m ³ , so if excess steam is generated temporarily, it is used as cooling water, and the excess steam condenser 60 condenses the steam to recover heat. It becomes possible. In other words, the method uses a hot well tank as a heat storage tank, and the heat storage capacity in this case is 80 ° C.
If possible, it will be 875Mcal, and surplus steam 1.5
can absorb t minutes. In addition, since the drain filter 40 (iron removal filter) that circulates through the hot well tank is installed in the hot well tank as described above, capital investment can be reduced by using the circulation pump 38 and piping. it can.

[0021]

As described above, the present invention has the following effects. (1) When a back-pressure steam turbine is provided in a steam pressure reducing line and steam that is used for heat is introduced into the back-pressure steam turbine to generate power or recover power, the following effects can be obtained. If power is recovered by introducing a back-pressure steam turbine generator, the power generation load on the gas turbine can be reduced, and the fuel consumption of the gas turbine can be reduced. As the back-pressure steam turbine generator, an induction generator is sufficient and the control method is simple, so that capital investment can be recovered in a short time. If power is recovered by a back-pressure steam turbine and used as a drive source for a centrifugal chiller or the like, the chilled water load on the absorption chiller can be reduced, and the fuel consumption of the steam boiler can be reduced. When the power is recovered by the back-pressure steam turbine and used as a drive source such as a pump, the power generation load of the gas turbine can be reduced, and the fuel consumption of the gas turbine can be reduced. (2) In a steam injection type gas turbine cogeneration system, the injected steam escapes to the atmosphere, so that the amount of boiler makeup water increases, and the water in the hot well tank is maintained at a relatively low temperature. Therefore, when the steam used for heat becomes excessive, the water in the hot well tank is circulated as cooling water to the excess steam condenser, and the heat of the excess steam is recovered by the water in the hot well tank. The following effects can be obtained. There is no need to release steam from a relief valve to a flue or the like as in the related art, and the generation of white smoke can be prevented. By condensing with the boiler feed water, the heat of the surplus steam is effectively used, so that the fuel consumption in the boiler can be saved. A hot well tank and a drain filter circulation line can be used, and there is no need to install a new heat storage tank or cooling water circulation line, resulting in an economical system.

[Brief description of the drawings]

FIG. 1 is a systematic configuration diagram showing a steam effective utilization device of a steam injection type gas turbine cogeneration system according to a first embodiment of the present invention.

FIG. 2 is a systematic diagram showing an example of a conventional steam injection type gas turbine cogeneration system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Steam injection type gas turbine 12 Fuel gas compressor 14 Air compressor 16 Gas turbine 18 Combustor 20 Generator 22 Waste heat boiler 24 Steam supply line for output increase 26 Steam supply line for NOx reduction 28, 28a Process steam line 30 Absorption refrigeration Machine 32 cooling tower 34 steam boiler 36a, 36b hot well tank 38 water pump (circulation pump) 40 drain filter 42 water circulation line 44 communication pipe 46 pressure reducing valve 48 relief valve 50 back pressure steam turbine inlet valve 52 back pressure steam turbine 54 bypass line 56 bypass valve 58 excess steam line 60 excess steam condenser 62 excess steam condenser inlet valve 64 cooling water circulation line 66 condensed water line 68 back pressure steam turbine generator 70 boiler feed pump

[Procedure amendment]

[Submission date] March 9, 2000 (200.3.9)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

1. A steam system in which a part of steam collected by an exhaust heat boiler of a plurality of steam injection type gas turbines provided in parallel is injected into a combustor to increase a power generation amount and use the remaining steam as heat. In an injection type gas turbine cogeneration system, surplus steam is diverted from the process steam line.
Install a steam condenser, hot well tank and excess steam
Equipped with a gas condenser, pump and drain filter
Was connected via a cooling water circulation line, when the process steam to heat utilization becomes surplus, it is introduced excess process steam in excess steam condenser, iron of sulfo Tsu preparative well tank and the boiler feedwater to store the boiler feed water Excluding
Using hot water drain filter circulation line
A method for effectively utilizing steam in a steam injection type gas turbine cogeneration, wherein water in a well tank is circulated as cooling water to an excess steam condenser, and heat of excess steam is recovered by water in a hot well tank .

2. A part of steam recovered by a waste heat boiler of a plurality of steam injection type gas turbines provided in parallel is injected into a combustor in order to increase a power generation amount, and the remaining steam is used for heat. In the steam injection type gas turbine cogeneration system, the excess process steam that is used for heat becomes excess, so that the excess process steam can be introduced into the excess steam condenser. the excess steam condenser is provided in the steam line, to iron removal a sulfo Tsu preparative well tank and iron in boiler feed water to the reservoir <br/> boiler feedwater
Hot well using a drain filter circulation line
The pump and drain filter are connected to the hot well tank and the excess steam condenser so that the water in the tank can be circulated as cooling water to the excess steam condenser and the heat of the excess steam can be recovered by the water in the hot well tank. A steam injection type gas turbine cogeneration system for effectively utilizing steam which is connected via a cooling water circulation line provided .

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

[0010]

As steam vapor effective usage of injection type gas turbine cogeneration SUMMARY OF THE INVENTION may, some of the steam recovered in the waste heat boiler of the plurality based steam injection type gas turbine provided in parallel In a steam injection type gas turbine cogeneration system, which injects electricity into a combustor to increase the amount of power generated and decompresses the remaining steam to utilize heat,
Ru configuration cover the introduction to the power generation and power recovery steam to the vacuum line utilized provided heat the backpressure steam turbine of the steam to the back pressure steam turbine.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

[0011] In order to achieve the above object, the steam of the present invention is used.
Effectiveness of steam for gas-injection gas turbine cogeneration
Usage is a portion of the vapor recovered by the waste heat boiler of the plurality based steam injection type gas turbine provided in parallel by injecting into the combustor increases the power generation amount, the steam injection the remaining vapor heat utilization Excess steam line that branches off from the process steam line in a type of gas turbine cogeneration
Install a surplus steam condenser in the hot well tank
Pump and drain filter with excess steam condenser
Connected via a cooling water circulation line equipped with, if the process steam heat utilization becomes surplus, is introduced excess process steam in excess steam condenser, sulfo Tsu preparative well tank and the boiler feedwater to store the boiler feed water Iron
Using a drain filter circulation line to remove iron
Water Tsu preparative wells tank was circulated to the excess steam condenser as cooling water, is configured to recover the excess steam heat water of the hot well tank.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

[0012] In addition, place a combination of the above Symbol two ways
In this case , a part of the steam collected by the exhaust heat boiler of a plurality of steam injection type gas turbines provided in parallel is injected into a combustor to increase the power generation amount, and the remaining steam is decompressed and used for heat. in the gas turbine cogeneration of steam injection type, surplus vapor of the vapor utilizing provided heat back pressure steam turbine to a vacuum line of the steam was introduced into the back pressure steam turbine to generate electricity and power recovery, branching from the process steam line
Install an extra steam condenser in the air line,
Pump and drain the tank and excess steam condenser
Connected through a cooling water circulation line with a filter,
When the process steam to heat utilization becomes surplus, is introduced excess process steam in excess steam condenser, sulfo Tsu preparative well tank and the boiler to the reservoir to the boiler feed water
A drain filter circulation line that removes iron in the water supply
Water hot well tank was circulated to the excess steam condenser as cooling water by utilizing, ing to the configuration of the recovery of the excess steam heat water of the hot well tank.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

[0013] as a vapor effective utilization device for steam injection gas turbine cogeneration, a portion of the vapor recovered by the waste heat boiler of the steam injection type gas turbine plurality groups provided in parallel to increase the power generation amount Therefore, in a steam injection type gas turbine cogeneration system in which the remaining steam is injected into the combustor and the remaining steam is decompressed and used for heat, the steam used for heat is introduced into the back-pressure steam turbine to generate power and recover power. as can be performed, configuration there Ru in which a back pressure steam turbine to a vacuum line of the steam.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

The steam injection type gas turbine cordier of the present invention
The NERATION steam effective utilization device injects a part of the steam collected by the exhaust heat boiler of multiple steam injection type gas turbines installed in parallel to the combustor to increase the power generation amount, and In a steam injection type gas turbine cogeneration system that uses steam for heat, a process steam line is provided so that excess process steam can be introduced into an excess steam condenser when the process steam to be used for heat becomes excessive. the excess steam condenser provided in excess steam line branching from, dividing the sulfo Tsu preparative well tank and iron in boiler feed water to the reservoir to the boiler feed water
Using hot water drain filter circulation line
The hot well tank and the surplus steam condenser are connected with a pump and a drain filter so that the water in the well tank can be circulated as cooling water to the surplus steam condenser and the heat of the surplus steam can be recovered by the water in the hot well tank. It is characterized in that it is connected via a cooling water circulation line provided with a cooling water circulation line.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

[0015] In addition, place a combination of the above Symbol two devices
In this case , part of the steam collected by the exhaust heat boilers of multiple steam injection gas turbines installed in parallel is injected into a combustor to increase the amount of power generation, and the remaining steam is depressurized to generate heat. In a steam injection type gas turbine cogeneration system that is used, a back pressure steam turbine is installed in a steam pressure reducing line so that steam that uses heat can be introduced into a back pressure steam turbine to generate power and recover power. In addition, a surplus steam condenser is provided in the surplus steam line branched from the process steam line so that the surplus process steam in the case where the process steam using heat becomes surplus can be introduced into the surplus steam condenser. sulfo Tsu door well tank and the boiler to store the water supply
A drain filter circulation line that removes iron in the water supply
The hot well tank and the surplus steam condenser are used so that the water in the hot well tank can be circulated to the surplus steam condenser as cooling water by utilizing the heat of the surplus steam with the water in the hot well tank. pumps and configuration connected through the cooling water circulation line provided with a drain filter and that Do.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction contents]

[0021]

In steam injection type gas turbine cogeneration, in accordance with the present invention, the injection steam increases boiler supply water to escape to the atmosphere, water the hot well tank is maintained at a relatively low temperature. Therefore, when the steam heat utilization becomes surplus, it is circulated to the excess steam condenser water of the hot well tank as cooling water, by configuring to recover the excess steam heat water of the hot well tank The following effects can be obtained. There is no need to release steam from a relief valve to a flue or the like as in the related art, and the generation of white smoke can be prevented. By condensing with the boiler feed water, the heat of the surplus steam is effectively used, so that the fuel consumption in the boiler can be saved. A hot well tank and a drain filter circulation line can be used, and there is no need to install a new heat storage tank or cooling water circulation line, resulting in an economical system.

Claims (6)

[Claims] 1. A part of steam collected by a waste heat boiler of a plurality of steam injection type gas turbines provided in parallel is injected into a combustor to increase a power generation amount, and the remaining steam is decompressed to generate heat. A steam injection type gas turbine cogeneration system in which a back pressure steam turbine is installed in a steam pressure reduction line, and steam that uses heat is introduced into the back pressure steam turbine to generate power and recover power. How to effectively use steam for gas turbine cogeneration. 2. Steam that uses a part of steam recovered by a waste heat boiler of a plurality of steam injection type gas turbines provided in parallel to a combustor to increase the power generation amount and use the remaining steam as heat. In the case of injection-type gas turbine cogeneration, when the process steam to be used for heat becomes excessive, the excess process steam is introduced into the excess steam condenser, and the water in the hot well tank for storing the boiler feedwater is cooled. A method for effectively utilizing steam of a steam injection type gas turbine cogeneration, wherein the steam is circulated through an excess steam condenser and heat of the excess steam is recovered by water in a hot well tank. 3. A part of the steam collected by a waste heat boiler of a plurality of steam injection type gas turbines provided in parallel is injected into a combustor to increase the power generation amount, and the remaining steam is decompressed to generate heat. In a steam injection type gas turbine cogeneration system, a back-pressure steam turbine is installed in the steam pressure reduction line, and the steam that uses heat is introduced into the back-pressure steam turbine to generate power and recover power. If
In addition to introducing excess process steam into the excess steam condenser, the water in the hot well tank for storing the boiler feedwater is circulated as cooling water to the excess steam condenser, and the heat of the excess steam is recovered by the water in the hot well tank. A method for effectively utilizing steam of a steam injection type gas turbine cogeneration, comprising: 4. A part of steam recovered by a waste heat boiler of a plurality of steam injection type gas turbines provided in parallel is injected into a combustor to increase power generation, and the remaining steam is depressurized. In a steam-injection type gas turbine cogeneration system that uses heat from the heat source, the steam that uses the heat is introduced into the back-pressure steam turbine to generate power and recover power. A steam injection type gas turbine cogeneration steam effective utilization device comprising a steam turbine. 5. A part of steam recovered by a waste heat boiler of a plurality of steam injection type gas turbines provided in parallel is injected into a combustor to increase power generation, and the remaining steam is used for heat. In the steam injection type gas turbine cogeneration system, the excess process steam that is used for heat becomes excess, so that the excess process steam can be introduced into the excess steam condenser. A surplus steam condenser is provided in the steam line, and the water in the hot well tank for storing the boiler feedwater is circulated through the surplus steam condenser as cooling water so that the heat of the surplus steam can be recovered by the water in the hot well tank. So that the hot well tank and the excess steam condenser are connected to the cooling water circulation with pump and filter Steam injection gas turbine cogeneration of steam effective utilization apparatus, characterized in that connected through an in. 6. A part of steam collected by a waste heat boiler of a plurality of steam injection type gas turbines provided in parallel is injected into a combustor to increase power generation, and the remaining steam is depressurized. In a steam-injection type gas turbine cogeneration system that uses heat from the heat source, the steam that uses the heat is introduced into the back-pressure steam turbine to generate power and recover power. A steam turbine is provided, and a surplus steam condenser is provided in the surplus steam line branched from the process steam line so that surplus process steam when heat is utilized becomes surplus can be introduced into the surplus steam condenser. The water in the hot well tank for storing the boiler feedwater is circulated as cooling water to the excess steam condenser, A hot-well tank and an excess steam condenser connected via a cooling water circulation line equipped with a pump and a filter so that the water can be recovered by the water in the hot-well tank. Cogeneration steam effective utilization equipment.