JP2002371807A - Turbine equipment and steam converting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure steam for cooling on the gas turbine 1 side, regardless of operation states of an exhaust heat recovering boiler and a steam turbine 6. SOLUTION: This steam converting device 46 makes steam bled from the steam turbine 6 or steam from an auxiliary steam line as a steam source, makes the steam and fluid from the outlet side of high/intermediate pressure water supply pump as saturated steam by being temporarily cooled up to a saturation temperature by a direct contact type heat exchange and converting the saturated steam into superheated steam (cooled steam) of a proper degree of superheat by heat-exchanging or mixing with a part of the steam source steam. Cooled steam converted by the steam converting device 46 is delivered to a combustor 40 of the gas turbine 1, and steam after cooling the combustor 40 is recovered in an intermediate pressure turbine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas turbine facility having a steam cooling device for cooling by introducing steam into a high-temperature component such as a combustor of a gas turbine. Further, the present invention is used for gas turbine equipment having a steam cooling device for introducing and cooling steam to a high-temperature component such as a combustor of a gas turbine, and generates cooling steam for cooling the high-temperature component of the gas turbine. The present invention relates to a steam converter.

[0002]

2. Description of the Related Art From the viewpoints of effective use of energy resources and economic efficiency, various high efficiencies have been achieved in power generation facilities (power generation plants). A turbine power plant (combined power plant) combining a gas turbine and a steam turbine is one of them. In a combined cycle power plant, high-temperature exhaust gas from a gas turbine is sent to an exhaust heat recovery boiler, and steam is generated by the exhaust heat recovery boiler, and the generated steam is sent to a steam turbine to work at the steam turbine. ing.

Conventionally, high-temperature components such as a combustor of a gas turbine have been cooled by air. However, with the recent rise in combustion temperature, they have been cooled by steam having high cooling performance. Also in a combined cycle power plant, a gas turbine that cools a high-temperature component such as a combustor with steam is applied, and a highly efficient power plant is planned in combination with a steam turbine. For example, steam (medium-pressure steam or low-temperature reheat steam and medium-pressure steam) from an exhaust heat recovery boiler is extracted, and cooling steam cooled by spraying water in pipes is led to a combustor, and the temperature and pressure are reduced. The required amount of cooling steam is supplied to the combustor by adjusting the amount of cooling steam based on the above. Then, the cooled steam is collected on the steam turbine side. For this reason, it becomes a combined cycle power plant in which an efficient cooling system is constructed.

[0004]

In the conventional gas turbine steam cooling system, the medium pressure steam from the exhaust heat recovery boiler is used. Therefore, the amount of steam that can be supplied for cooling is limited depending on the load conditions of the plant. You. In order to secure the amount of steam, a backup steam system that uses high-pressure steam as a supply source is added, and the design of the exhaust heat recovery boiler is changed to secure the amount of medium-pressure steam for cooling. Is the current situation. For this reason, there has been a problem that the cost increases due to the addition of the backup steam system and that the efficiency of the plant is reduced due to the inflow of the backup steam.

[0005] Further, in the exhaust heat recovery boiler designed to secure medium-pressure steam for cooling, there has been a problem that the design of the exhaust heat recovery boiler is limited and the performance is reduced. Furthermore, equipment having different numbers of steam turbines and gas turbines (for example, two gas turbines or three gas turbines for one steam turbine)
In this case, there is a possibility that matching control such as pressure balance becomes difficult.

Further, the conventional steam source steam for cooling steam has a high temperature and needs to be cooled by providing a desuperheater in the steam line. However, it is a system in which water is sprayed in a pipe to ensure that water droplets flow into the combustor. In order to avoid this, the cooling temperature had to be set high, and the amount of cooling steam increased, and effective steam cooling was not possible.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a turbine facility capable of securing cooling steam on a gas turbine side irrespective of the operation state of a steam turbine and an exhaust heat recovery boiler. With the goal. Also,
It is an object of the present invention to provide a steam converter capable of securing steam for cooling on a gas turbine side irrespective of the operation state of a steam turbine.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the construction of the turbine equipment according to the present invention is an exhaust heat recovery boiler for generating steam by exhaust gas of a gas turbine, and is operated by the steam of the exhaust heat recovery boiler. A steam turbine,
In a turbine facility comprising a condenser for condensing the exhaust gas of a steam turbine and a water supply system for supplying condensate condensed in the condenser to a waste heat recovery boiler by a high / medium pressure water supply pump, Steam from the auxiliary steam line or steam from the auxiliary steam line is used as a steam source, and the fluid from the outlet side of the high / medium pressure feedwater pump is once cooled to the saturation temperature by direct contact heat exchange to obtain saturated steam, and then the steam source A steam converter that converts superheated steam (cooling steam) with an appropriate degree of superheat by exchanging heat or mixing with part of the steam, and introducing the cooling steam converted by the steam converter to the high-temperature component side of the gas turbine. And a cooling steam supply line.

[0009] The exhaust heat recovery boiler is provided with a high pressure side economizer and a low pressure economizer, and the fluid from the outlet side of the high / medium pressure feedwater pump is the fluid on the exit side of the low pressure economizer. There is a feature. In addition, the heat recovery boiler is provided with a high pressure side economizer and a low pressure side economizer, and the fluid from the outlet side of the high / medium pressure feed pump is the fluid on the outlet side of the high pressure economizer. Features. Further, the fluid from the outlet side of the high / medium pressure water pump is water supplied by branching from the high / medium pressure water pump. Further, the cooling steam converted by the steam converter is introduced to the high-temperature component side of the gas turbine, and the steam after cooling the high-temperature component is recovered and supplied to the medium-pressure turbine.

Further, in the steam converter, after the steam of the steam source is once introduced into the feed water and cooled to saturated steam by direct contact heat exchange, a part of the steam source steam is piped (heat exchange tube). , The saturated steam is superheated by heat exchange between the pipes and becomes steam for cooling at an appropriate superheated temperature. In the steam converter, the steam from the steam source is injected into the water supply, cooled to saturated steam by direct contact heat exchange, and then mixed with some steam source steam to raise the temperature. Characterized in that it becomes steam for cooling at an overheating temperature of

According to another aspect of the present invention, there is provided a steam converter that generates steam using exhaust gas from a gas turbine, a steam turbine that operates using steam from the exhaust heat recovery boiler, The condenser that condenses the turbine exhaust and the condensate condensed by the condenser
A steam converter for generating cooling steam for cooling high-temperature parts of a gas turbine, which is used for a turbine facility having a water supply system for feeding a waste heat recovery boiler by a medium-pressure water pump. And / or a pipe into which the fluid from the exhaust heat recovery boiler is introduced, and a pipe which is disposed in the main body and introduces steam of the steam turbine into water, and once cooled to a saturation temperature by direct contact heat exchange. Temperature detecting means for detecting the temperature of the cooling steam, by converting the steam into saturated steam, and then performing heat exchange or mixing with a part of the steam source steam to convert the steam into a superheated steam having an appropriate degree of superheat; Distribution that controls the distribution of the steam from the steam source into the feed water in the main body of the steam converter and the steam flowing down the piping in the main body or mixed in the main body based on the information of Volume adjusting means, a water level detecting means for detecting a water supply amount in the main body, and a water supply amount adjusting means for controlling a fluid introduction state from the exhaust heat recovery boiler based on information of the water level detecting means, I do.

Further, the steam introduced from the steam turbine is switched from high-pressure turbine bleed air (mid-stage of the high-pressure turbine) or high-pressure turbine exhaust and two or more steam sources in accordance with the operating condition of the turbine plant. In addition, the steam after cooling the combustor is introduced into two or more places, such as the inlet of the intermediate-pressure turbine or the middle stage of the intermediate-pressure turbine, by the steam line. Is adopted.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The turbine equipment of the present invention will be described with reference to FIG. FIG. 1 shows a schematic system of a turbine facility according to a first embodiment of the present invention.

The first embodiment will be described with reference to FIG.

As shown in FIG. 1, the exhaust gas from the gas turbine 1 is sent to an exhaust heat recovery boiler 2. The exhaust heat recovery boiler 2 includes a high-pressure heating unit 3, a medium-pressure heating unit 4, A low-pressure heating unit 5 is provided. In the exhaust heat recovery boiler 2, the high pressure heating unit 3,
Steam is generated via the medium-pressure heating unit 4 and the low-pressure heating unit 5, and the generated steam is sent to the steam turbine 6 to perform work in the steam turbine 6. Exhaust gas from the low-pressure turbine 8 of the steam turbine 6 is condensed and condensed by a condenser 35 and supplied to the exhaust heat recovery boiler 2 by a condensate pump 37.

The high-pressure heating unit 3 includes a high-pressure superheater 11,
It has a high-pressure drum 12, a high-pressure evaporator 13, and a high-pressure economizer 41 as a high-pressure economizer. The water in the high-pressure drum 12 is heated and circulated in a high-pressure evaporator 13 disposed in the exhaust heat recovery boiler 2, and generates high-pressure steam in the high-pressure drum 12.
The high-pressure steam generated by the high-pressure drum 12 is superheated by a high-pressure superheater 11 arranged in the exhaust heat recovery boiler 2 and introduced into the high-pressure turbine 7 of the steam turbine 6. Water is supplied to the high-pressure drum 12 through a condenser 35, a condensate pump 37, a low-pressure economizer / preheater (low-pressure economizer) 42, a high / medium-pressure water supply pump 10, and a high-pressure economizer 41. . Further, a reheater 18 is provided in the exhaust heat recovery boiler 2, and the exhaust of the high-pressure turbine 7 is reheated by adding medium-pressure superheated steam to be described later. It is supplied to a turbine 19.

The low-pressure heating unit 5 includes a low-pressure superheater 21,
It has a low-pressure drum 22, a low-pressure evaporator 23, and a low-pressure economizer 42. The water in the low-pressure drum 22 is discharged from the heat recovery boiler 2
Heated and circulated by a low-pressure evaporator 23 disposed therein, and generates low-pressure steam in the low-pressure drum 22. The low-pressure steam generated in the low-pressure drum 22 passes through the low-pressure superheater 21 and passes through the low-pressure turbine 8.
Supplied to Condensed water from the condenser 35 is supplied to the low-pressure drum 22 via the low-pressure economizer 42. Further, a part of the water on the outlet side of the low-pressure economizer 42 is returned to the inlet side of the low-pressure economizer 42 via the low-pressure economizer / preheater recirculation pump 20.

The medium-pressure heating unit 4 includes a medium-pressure superheater 31,
It has a medium pressure drum 32, a medium pressure evaporator 33 and a medium pressure economizer 43. The water of the medium pressure drum 32 is discharged to the heat recovery boiler 2
It is heated and circulated by a medium-pressure evaporator 33 disposed therein, and generates medium-pressure steam in a medium-pressure drum 32. The medium-pressure steam generated by the medium-pressure drum 32 passes through the medium-pressure superheater 31 and is introduced into the inlet side of the reheater 18 by the medium-pressure steam line 30, and the reheater 18
Is reheated together with the high pressure turbine exhaust and
Supplied to Water is supplied to the intermediate-pressure drum 32 through the condenser 35, the low-pressure economizer 42, the high / intermediate-pressure water supply pump 10, and the intermediate-pressure economizer 43.

The arrangement of each device in the exhaust heat recovery boiler 2 is merely an example, and the number and arrangement of the economizer, the evaporator and the superheater may be appropriately changed according to the performance of the gas turbine.

On the other hand, the gas turbine 1 is provided with a combustor 40 as a high-temperature part, and the combustor 40 is cooled by steam from a steam converter 46 as steam conversion means. When high-temperature components of the gas turbine 1 are not only the combustor 40 but also steam recovery type blades, cooling by cooling steam can be applied to the blades.

In the embodiment shown in FIG. 1, an extraction line 55 is provided from the high-pressure turbine 7 so that the steam extracted from the high-pressure turbine 7 is used as a steam source for the steam converter 46 and the exhaust line 59 of the high-pressure turbine 7 is used as the steam. The exhaust steam of the high-pressure turbine 7 is connected to the converter 46 side as a steam source of the steam converter 46, and a part of the steam source steam distributed by the three-way valve 75 is blown into the cooling water, and the saturated steam is produced by direct contact heat exchange. Then, the remaining steam source steam distributed by the three-way valve 75 is caused to flow down in a pipe (heat exchange tube) to be superheated to steam having an appropriate degree of superheat, thereby producing steam for combustor cooling. . As a fluid on the outlet side of the high / medium pressure water supply pump 10 for cooling the steam source steam, water supplied from the water supply lines 52 and 47 branched from the high / medium pressure water supply pump 10 is supplied to the steam converter 46. .

The water supply line 52 is provided with a heat exchanger 48, and feed water branched from the high / medium pressure water supply pump 10 is heated and heated via the water supply line 47 to the steam converter 4.
6. As the heat exchanger 48, for example, a TCA cooler (compressed air for cooling) or the like is employed. The steam generated in the steam converter 46 is sent from the cooling steam supply line 49 to the combustor 40, and the steam after cooling the combustor 40 is supplied to the inlet of the intermediate pressure turbine 19 or the middle of the intermediate pressure turbine 19 by the steam line 56. It is designed to be introduced in a stage. After cooling the combustor 40, a method of appropriately switching the recovery destination to the intermediate pressure turbine according to the plant operating conditions is adopted.

In the above-described turbine equipment, the steam converter 4 uses the extracted steam of the high-pressure steam turbine 7 or the exhaust of the high-pressure turbine 7 as a steam source instead of the exhaust heat recovery gas boiler 2.
6 and is once exchanged with saturated steam by heat exchange with the feedwater from the feedwater lines 52 and 47 branched by the high / medium pressure feedwater pump 10, and then heated to an appropriate degree of superheat to produce the combustor cooling steam. Is generated. The cooling steam is sent from a cooling steam supply line 49 to the combustor 40, and the steam after cooling the combustor 40 passes through a desuperheater not shown in FIG. Turbine 19
Is collected in the middle stage. Therefore, the high-temperature components of the gas turbine 1 are cooled by the steam from the steam converter 46,
That is, the cooling steam source for the high-temperature components is the steam converter 46,
The amount of steam that can be supplied for cooling does not depend on the exhaust heat recovery boiler 2 and is not limited.

Thus, in order to secure a necessary amount of steam for cooling, a backup steam system using a high-pressure steam as a supply source is added, and exhaust heat recovery is performed so that a medium-pressure steam amount for cooling can be secured. There is no need to change the design of the boiler 2. Therefore, the steam for cooling on the gas turbine 1 side can be generated by the steam converter 46, so that it is not necessary to use the steam on the exhaust heat recovery boiler 2 side as cooling steam, and the gas turbine 1 and the exhaust heat recovery boiler 2 Even if the steam turbine 6 system is different from the plant, the cooling condition on the gas turbine 1 side can be fixed, and the operation mode of the gas turbine 1, the exhaust heat recovery boiler 2 and the steam turbine 6 system can be fixed. The gas turbine 1 and the exhaust heat recovery boiler 2 can be planned independently, and the reliability is improved.

A second embodiment will be described with reference to FIG.

In the embodiment shown in FIG. 2, the fluid on the outlet side of the medium pressure saving device 43 of the exhaust heat recovery boiler 2 is used as the fluid on the outlet side of the high / medium pressure water supply pump 10 in the water supply line 54 and the water supply line. 47 is used to supply water to the steam converter 46. Other configurations are the same as those of the first embodiment shown in FIG. The turbine equipment of the second embodiment is also
The cooling steam source for the high-temperature components is the steam converter 46, and the amount of steam that can be supplied for cooling does not depend on the exhaust heat recovery boiler 2 side and is not limited.

Accordingly, the steam for cooling on the gas turbine 1 side can be generated by the steam converter 46, and it is not necessary to use the steam on the exhaust heat recovery boiler 2 side as cooling steam. Even in a plant where the boiler 2 and the steam turbine 6 system are different, the cooling conditions on the gas turbine 1 side can be fixed, and the gas turbine 1, the exhaust heat recovery boiler 2 and the steam turbine 6
Regardless of the operation mode with the system, the gas turbine 1 and the exhaust heat recovery boiler 2 can be independently planned, and the reliability is improved.

A third embodiment will be described with reference to FIG.

In the embodiment shown in FIG. 3, the fluid on the outlet side of the high pressure economizer 41 of the exhaust heat recovery boiler 2 is used as the fluid on the outlet side of the high / medium pressure water supply pump 10 in the water supply line 53 and the water supply line 47. Thus, the water is supplied to the steam converter 46 by the above-described method. Other configurations are the same as those of the first embodiment shown in FIG. Also in the turbine equipment of the third embodiment, the cooling steam source for the high-temperature components is the steam converter 46, and the amount of steam that can be supplied for cooling is not limited by the exhaust heat recovery boiler 2 and is not limited.

Therefore, the steam for cooling on the gas turbine 1 side can be generated by the steam converter 46, and it is not necessary to use the steam on the exhaust heat recovery boiler 2 side as cooling steam. Even in a plant where the boiler 2 and the steam turbine 6 system are different, the cooling conditions on the gas turbine 1 side can be fixed, and the gas turbine 1, the exhaust heat recovery boiler 2 and the steam turbine 6
Regardless of the operation mode with the system, the gas turbine 1 and the exhaust heat recovery boiler 2 can be independently planned, and the reliability is improved.

The specific structure of the steam converter 46 shown in FIGS. 1 to 3 will be described with reference to FIG. FIG. 4 shows a cross section showing a specific configuration of the steam converter 46.

As shown in the drawing, a water supply line 47 communicates with a lower portion of a main body 71 of the steam converter 46, and a fluid from the exhaust heat recovery boiler 2 is supplied into the main body 71. Body 71
The water supply amount in the inside is adjusted to a predetermined water level by a water supply amount adjusting means described later. Extraction line 55 and exhaust line 5
9 is supplied to the steam pipe 76 and the main body 7 by a three-way valve 75.
It is branched into steam to one steam chamber 73. The steam from the steam source 76 branched into the steam pipe 76 is introduced into the lower part of the main body 71, and is jetted into the feed water from a number of small holes 77 at the tip of the steam pipe 76.
The jetted steam is cooled to the saturation temperature by direct contact heat exchange with the feed water to generate saturated steam.

On the other hand, a tube sheet 72 is mounted on the upper part of the main body 71, and the steam chamber 73 is provided on the upper part of the main body 71 by the tube sheet 72.
Is formed, and the steam source steam branched by the three-way valve 75 flows into the steam chamber 73. A plurality of pipes (heat exchange tubes) 74 are connected to the tube sheet 72, and the lower ends of the pipes (heat exchange tubes) 74 are located inside the water supply. Steam room 7
The steam from the steam source flowing into the pipe 3 is a pipe (heat exchange tube) 74.
At this time, heat exchange occurs with the saturated steam generated by the direct contact heat exchange, and the saturated steam is converted into superheated steam.
The temperature of the steam from the steam chamber 73 is lowered by heat exchange, and the steam is blown into the feedwater to generate saturated steam by direct contact heat exchange with the feedwater similarly to the steam in the steam pipe 76.

The superheated steam is used as cooling steam, and is sent from the cooling steam supply line 49 to the combustor 40. The illustrated steam converter 46 is relatively large and heavy, and has a function of suppressing a change in the pressure and temperature of the cooling steam supply line to be low even if the heat storage capacity is large and the steam pressure and temperature slightly change. I have. In addition, the heat storage function can be easily increased at low cost.

The flow rate control of the fluid in the steam converter 46 shown in FIG. 4 will be described with reference to FIG. FIG. 5 shows a schematic configuration of a fluid system of the steam converter 46.

As shown in FIG.
Is provided with a temperature detector 64 as temperature detecting means,
The temperature of the cooling steam is detected by the temperature detector 64, and the detection information is input to the control unit 65. Steam pipe 76 and piping (heat exchange tube) by three-way valve 75 by control means 65
The amount of steam sent to 74 is distributed and adjusted so that the temperature of the superheated steam becomes a predetermined temperature (steam flow control means).

That is, if the amount of distribution steam flowing through the pipe (heat exchange tube) 74 increases, the degree of superheat of the cooling steam temperature increases, and if it decreases, the degree of superheat decreases. The advantage of this method is that even if the steam supplied to the pipe (heat exchange tube) 74 becomes zero due to malfunction of the three-way valve 75, the inside of the steam converter 71 of the saturated steam generated at the lower part of the steam converter Since the rising speed is low, the pipe (heat exchange tube) 74 plays the role of a demister, and water droplets in the saturated steam are separated. Water droplets remain in the steam as in the case of a combustor, and the risk of the water droplets flowing into the combustor and damaging the combustor is extremely low.

The high-pressure turbine extraction 55 and the high-pressure turbine exhaust 59 of the steam source steam are provided with a check valve and a motor-operated valve (numbering omitted), respectively, so that they can be switched according to the plant operating conditions. The steam after cooling the combustor 40 is passed through the desuperheater 79, and then is recovered to the inlet of the intermediate-pressure turbine 19 and the middle stage of the intermediate-pressure turbine 19 via a check valve and an electric valve (numbering omitted). It is a configuration that is performed. The switching of the steam recovery destination is performed according to the operating condition of the plant, similarly to the switching of the steam source steam. It is also possible to provide an auxiliary steam system 63 for introducing auxiliary steam as steam source steam. If this method is adopted, there is no problem even if the steam pressure from the steam turbine is reduced at the time of starting and stopping the plant, and the amount of extracted high-pressure turbine is insufficient.

At the lower part of the main body 71, a water level detector 66 is provided as a water level detecting means for detecting the water level of the supply water, and the detection information of the water level detector 66 is inputted to the control means 65. A flow control valve 67 is provided in the water supply line 47, and the opening and closing of the flow control valve 67 is controlled by the control means 65, so that the water supply level in the steam converter main body 71 of the water supply is maintained in a predetermined state (water supply amount adjusting means). ).

The steam line 56 for sending the steam after cooling the combustor 40 to the intermediate-pressure turbine 19 is provided with a desuperheater 79, and the dewaterer 79 is sprayed with water supplied from a water supply line 47. The steam is cooled down.

As the steam converter 46, in addition to the steam converter 46 having a configuration in which the saturated steam is heated by the pipe (heat exchange tube) 74 shown in FIG.
As shown in FIG. 6, there is also a method using a steam converter 81 that blows a steam source steam into the main body 71 and mixes it with saturated steam to generate cooling steam as superheated steam having an appropriate degree of superheat.

With the steam converter 46 and the steam converter 81, it is possible to generate cooling steam for the high-temperature components (combustor 40) of the gas turbine 1, and it is not necessary to use steam from the exhaust gas boiler as cooling steam. For this reason,
Regardless of the operation state of the exhaust heat recovery boiler 2, the gas turbine 1
It is possible to provide the steam converters 46 and 81 that can secure steam for cooling on the side.

[0043]

The turbine equipment according to the present invention comprises an exhaust heat recovery boiler for generating steam by the exhaust gas of a gas turbine, a steam turbine operated by the steam of the exhaust heat recovery boiler, and a condensate for condensing the exhaust gas of the steam turbine. In a turbine facility consisting of a water condenser and a condensate condensed in the condenser, and a water supply system that supplies the condensate condensate to the exhaust heat recovery boiler by a high- and medium-pressure water supply pump, the steam extracted from the steam turbine or the auxiliary steam line Is used as a steam source, and the fluid from the outlet side of the high / medium pressure feedwater pump is once cooled to the saturation temperature by direct contact heat exchange to obtain saturated steam, and then heat exchange with a part of the steam source steam or A steam converter that converts the superheated steam into an appropriate superheat degree by mixing, and a cooling steam supply that introduces the cooling steam converted by the steam converter to the high-temperature parts of the gas turbine The steam turbine can generate cooling steam for the high-temperature components of the gas turbine, eliminating the need to use steam from the exhaust gas boiler as cooling steam, regardless of the operating conditions of the steam turbine. Steam can be secured. As a result, even when the gas turbine and the exhaust heat recovery boiler and the steam turbine system are applied to different plants, the cooling conditions on the gas turbine side can be fixed, and the gas turbine and the exhaust heat recovery boiler Regardless of the operation mode with the steam turbine system, the gas turbine and the exhaust heat recovery boiler can be independently planned, and the reliability can be improved.

The steam converter according to the present invention comprises an exhaust heat recovery boiler for generating steam by exhaust gas from a gas turbine, a steam turbine operated by the steam from the exhaust heat recovery boiler, and a condensate for condensing the exhaust gas from the steam turbine. Used for turbine equipment equipped with a water heater and a water supply system that supplies condensate condensed in the condenser to the exhaust heat recovery boiler by a high / medium pressure water supply pump, and cools high-temperature parts of the gas turbine A steam converter for generating cooling steam, comprising a condenser and / or
Alternatively, a main body into which the fluid from the exhaust heat recovery boiler is introduced, and a pipe arranged inside the main body and introducing steam of the steam turbine into the water, and once cooled to the saturation temperature by the direct contact heat exchange to obtain the saturated steam Then, heat exchange or mixing with a part of the steam source steam is performed to convert the superheated steam into a superheated steam having an appropriate degree of superheat, and temperature detection means for detecting the temperature of the cooling steam, and information on the temperature detection means Steam distribution flow rate adjusting means for controlling the distribution of steam from a steam source into the feed water in the main body of the steam converter based on the steam distribution and steam to flow down in the main body piping or to be mixed in the main body, Since the apparatus includes a water level detecting means for detecting a water supply amount in the main body and a water supply amount adjusting means for controlling a state of fluid introduction from the exhaust heat recovery boiler based on information of the water level detecting means, an operation state of the steam turbine is provided. It is possible to secure the steam for cooling regardless gas turbine side. As a result, even when the gas turbine and the exhaust heat recovery boiler and the steam turbine system are applied to different plants, the cooling conditions on the gas turbine side can be fixed, and the gas turbine and the exhaust heat recovery boiler Regardless of the operation mode with the steam turbine system, the gas turbine and the exhaust heat recovery boiler can be independently planned, and the reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic system diagram of a turbine facility according to a first embodiment of the present invention.

FIG. 2 is a schematic system diagram of a turbine facility according to a second embodiment of the present invention.

FIG. 3 is a schematic system diagram of a turbine facility according to a third embodiment of the present invention.

FIG. 4 is a cross-sectional view illustrating a specific configuration of the steam converter 46.

FIG. 5 is a schematic configuration diagram of a fluid system of the steam converter 46.

FIG. 6 is a schematic configuration diagram of a steam converter according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas turbine 2 Exhaust heat recovery boiler 3 High pressure heating unit 4 Medium pressure heating unit 5 Low pressure heating unit 6 Steam turbine 7 High pressure turbine 10 High / medium pressure feedwater pump 11 High pressure superheater 12 High pressure drum 13 High pressure evaporator 18 Reheater 19 Medium pressure turbine 20 Low pressure economizer / preheater circulation pump 21 Low pressure superheater 22 Low pressure drum 23 Low pressure evaporator 30 Medium pressure steam line 31 Medium pressure superheater 32 Medium pressure drum 33 Medium pressure evaporator 35 Condenser 37 Condensate Pump 41 High-pressure economizer 43 Medium-pressure economizer 46,81 Steam converter 47,52,53,54 Water supply line 48 Heat exchanger 49 Cooling steam supply line 50 Steam recovery line 51,56 Steam line 55 Extraction line 59 Exhaust Line 64 temperature detector 65 control means 66 water level detector 67 flow control valve 71 Converter) 72 tubesheet 73 steam chamber 75 three-way valve 76 the steam pipe

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F01D 25/12 F01D 25/12 E F01K 23/10 F01K 23/10 X F02C 7/18 F02C 7/18 A C E F22B 1/18 F22B 1/18 E F22G 1/04 F22G 1/04 (72) Inventor Tomoko Fujii 2-1-1 Shinhama, Arai-machi, Takasago-shi, Hyogo Pref. Masahisa Fujimoto 2-19, Shinhama, Arai-cho, Takasago-shi, Hyogo F-term within Takaishi Engineering Co., Ltd. 3G071 AB01 BA10 DA09 DA11 FA06 HA05 JA03 3G081 BA04 BA11 BB00 BC07 BD00 DA03 DA06 DA23

Claims (8)

[Claims] An exhaust heat recovery boiler that generates steam by exhaust gas of a gas turbine, a steam turbine that is operated by the steam of the exhaust heat recovery boiler, a condenser that condenses the exhaust of the steam turbine, and a condenser And a water supply system that feeds the condensed water condensed by the high / medium pressure water supply pump to the exhaust heat recovery boiler side, using steam extracted from the steam turbine or steam from the auxiliary steam line as a steam source, The fluid from the outlet side of the high / medium pressure feedwater pump is cooled to the saturation temperature by direct contact heat exchange to obtain saturated steam, and then moderately heated by heat exchange or mixing with a part of the steam source steam. A steam converter that converts the steam into superheated steam, and a cooling steam supply line that introduces the cooling steam converted by the steam converter to the high-temperature component side of the gas turbine. And turbine equipment. 2. The exhaust heat recovery boiler according to claim 1, further comprising a high-pressure side economizer and a low-pressure economizer, and a fluid from an outlet side of the high / medium pressure water supply pump is supplied to the low-pressure economizer. Turbine equipment characterized by being an outlet fluid. 3. The exhaust heat recovery boiler according to claim 1, further comprising: a high pressure side economizer and a low pressure side economizer; Turbine equipment characterized by being an outlet fluid. 4. The turbine facility according to claim 1, wherein the fluid from the outlet side of the high / medium pressure water supply pump is a water supply branched from the high / medium pressure water supply pump. 5. The steam turbine according to claim 1, wherein the cooling steam converted by the steam converter is introduced to a high-temperature component side of the gas turbine, and the steam after cooling the high-temperature component is recovered and supplied to a medium-pressure turbine. Turbine equipment characterized by the following. 6. The steam converter according to claim 1, wherein in the steam converter, steam from a steam source is once introduced into feed water and cooled to saturated steam by direct contact heat exchange. Turbine equipment characterized in that saturated steam is superheated by heat exchange between the source steam and the pipe when the source steam flows down the pipe to become a cooling steam at an appropriate superheated temperature. 7. The steam converter according to claim 1, wherein in the steam converter, steam from a steam source is once introduced into feed water and cooled to saturated steam by direct contact heat exchange, and then a portion of the steam is supplied. Turbine equipment characterized in that by mixing with source steam, the temperature rises and becomes steam for cooling at an appropriate superheat temperature. 8. An exhaust heat recovery boiler for generating steam by exhaust gas of a gas turbine, a steam turbine operated by the steam of the exhaust heat recovery boiler, a condenser for condensing exhaust of the steam turbine, and a condenser Used for turbine equipment equipped with a water supply system that supplies condensed water condensed by the high / medium pressure water supply pump to the exhaust heat recovery boiler side, and generates cooling steam that cools high-temperature parts of the gas turbine A conversion device, comprising: a main body into which a fluid from a condenser and / or a waste heat recovery boiler is introduced; and a pipe disposed in the main body and introducing steam of a steam turbine into water; Once cooled to the saturation temperature by exchange to obtain saturated steam, then heat exchange or mixing with a part of the steam source steam to convert it to superheated steam with an appropriate degree of superheat, and the temperature of the steam for cooling Temperature detecting means for detecting the temperature of the steam, and the steam flowing from the steam source into the water supply in the main body of the steam converter based on the information of the temperature detecting means, and the steam flowing down the piping in the main body or mixed in the main body. Steam distribution flow rate adjusting means for controlling the distribution of steam to be discharged, water level detecting means for detecting the amount of water supply in the main body, and water supply amount adjusting means for controlling the state of introduction of fluid from the exhaust heat recovery boiler based on information from the water level detecting means. And a steam converter.