JP2960371B2 - Hydrogen combustion turbine plant - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to the use of hydrogen as a fuel,
The present invention relates to a hydrogen combustion turbine plant using pure oxygen as an oxidizing agent, and more particularly to a hydrogen combustion turbine plant based on a multi-stage reheat Rankine cycle and utilizing steam generated by pure oxygen combustion of hydrogen for cooling components of a turbine. .

[0002]

2. Description of the Related Art Recent thermal power plants have been highly evaluated for their high thermal efficiency and shortened plant start-up time. A combined cycle power plant combining a gas turbine plant with a steam turbine plant and an exhaust heat recovery boiler has been developed. It is operated in many practical applications.

[0003] In this combined cycle power plant, however, natural resources such as liquefied natural gas and petroleum (kerosene) are used as fuel for the gas turbine plant. Considering the large consumption of several hundred tons per hour, the reserves of natural resources are limited and alternative fuels are naturally needed. Also, natural resources are clean energy, but harmful wastes such as NOx and CO cannot be completely eliminated, and high output is demanded today. Very few alternative fuels are needed. In addition, today's electricity consumption in the consumer sector, including households, is still growing, and to meet this demand, alternative prime movers that can produce higher power than gas turbine plants are needed.

[0004] Such social needs seeds,
Recently, using hydrogen as fuel and pure oxygen as oxidizer,
Combination of an exhaust heat recovery boiler and a hydrogen combustion turbine plant that cleans the waste generated by pure oxygen combustion of hydrogen, raises the generated steam to ultra-high temperature, and turns this ultra-high temperature steam into turbine-driven steam The cycle power plant has been published in Japanese Unexamined Patent Publication No. Hei 7-293207 and in the 1994 report of the New Energy and Industrial Technology Development Organization (No. NEDO-WE-NET-9483), and its commercial feasibility is high. Watched with expectation.

As shown in FIG. 4, this hydrogen-fired turbine plant includes a medium-pressure turbine 3 having a combination of a medium-high-pressure turbine 3a and a medium-low-pressure turbine 3b between a high-pressure turbine 1 and a low-pressure turbine 2. Ultra-high-temperature steam (steam) generated from the high-pressure hydrogen combustor 4a and the low-pressure hydrogen combustor 4b is supplied to each of the turbine 3a and the medium- and low-pressure turbines 3b.

[0006] The medium-pressure turbine 3
The exhaust heat recovery boilers 5a and 5b are respectively provided on the turbine exhaust side of the a and middle and low pressure turbines 3b, and the exhaust heat recovery boilers 5a and 5b heat the high pressure feed water from the condensate water supply system 6 to generate ultra-high temperature steam. Let me.

[0007] The ultra-high-temperature steam generated in each of the waste heat recovery boilers 5a and 5b drives the high-pressure turbine 1 after merging, and the turbine exhaust is reheated by the equivalent combustion of hydrogen and pure oxygen in the high-pressure hydrogen combustor 4a. The steam is then guided to the medium-high pressure turbine 3a, where it performs expansion work, and then guided to the exhaust heat recovery boiler 5a as a heating source for the steam generation of the feedwater.

The steam whose temperature has dropped in the exhaust heat recovery boiler 5a is reheated again by the equivalent combustion of hydrogen and pure oxygen in the low-pressure hydrogen combustor 4b, and performs expansion work in the medium- and low-pressure turbine 3b. The heat is supplied to the heat recovery boiler 5b, where the supply water is turned into superheated steam, and then the low pressure turbine 2 is driven to rotate the generator 7.

As described above, the recently disclosed hydrogen combustion turbine plant is provided with the high and low pressure hydrogen combustors 4a and 4b so that ultrahigh temperature steam of 1700 ° C. or more can be generated by the pure oxygen combustion of hydrogen. With this ultra-high temperature, electric power of more than 480,000 KW can be output, and it is trying to meet the electric power demand of the consumer sector. 480,000K
An electric output of W or more is one of the largest in the world as this type of single unit capacity.

[0010]

In the hydrogen combustion turbine plant shown in FIG. 4, since the driving steam of the medium- and high-pressure turbines 3a and 3b has an extremely high temperature of 1700 ° C. or more, each of the turbines 3a and 3b It is necessary to ensure the maintenance of the material strength of the component parts, for example, the turbine stationary blade, the turbine blade, and the like. For this reason, the hydrogen combustion turbine plant shown in FIG. 4 has already been proposed with a cooling system that effectively cools the respective components of the medium- and high-pressure turbines 3a and 3b using the high specific heat of steam. ing.

As shown in FIG. 5, this cooling system is provided with a steam cooling supply pipe 8a for medium and high pressure turbines and a first steam cooling supply pipe 8b for medium and low pressure turbines, which are bypassed from the inlet side of the high pressure hydrogen combustor 4a. And a second steam cooling supply pipe 8c for a medium / low pressure turbine that is bypassed from the inlet side of the low pressure hydrogen combustor 4b.

Further, a steam cooling supply pipe 8 for a medium / high pressure turbine
The cooling steam of the second steam cooling supply pipe 8c for the medium and low pressure turbines is a so-called open type cooling, in which the respective components of the medium and high pressure turbines 3a and 3b are cooled and then combined with the driving steam. It has become.

The cooling steam in the first steam cooling supply pipe 8b for the middle / low pressure turbine is so-called recovery cooling, in which the components of the middle / low pressure turbine 3b are cooled and then returned to the high pressure hydrogen combustor 4a.

The reason why the turbine vanes and the turbine blades, which are the components of the medium- and high-pressure turbines 3a and 3b, need to be cooled, is that 700
This is because maintaining the strength of up to 800 ° C. is the limit, and if the turbine driving steam is 1700 ° C. or more, it becomes difficult to maintain the strength of the blade material.

The reason why the medium- and low-pressure turbine 3b uses both open cooling and recovery cooling of the steam after cooling the blades is that the cooling area in the leading edge and trailing edge of the blade is smaller than that in the middle part of the blade. The cooling steam passing through the middle part of the wing, which can be cooled well, is recovered by cooling, and the cooling steam passing through the wing leading edge and the wing trailing edge, which is difficult to cool, by open cooling. , Based on effective cooling and heat recovery by combining both advantages.

Further, the reason that the medium-to-high pressure turbine 3a is limited to only the open type cooling is that it is difficult to select the pressure of the cooling steam, and if a supply source is required at the inlet side of the high pressure turbine 1, it is necessary for the recovery type cooling. When the blade is cooled because it is higher than the pressure, an unnecessary pressure loss is caused, and the thermal efficiency of the plant becomes low in terms of heat accounting. And heat recovery becomes more difficult.

In general, recovery cooling and open cooling have advantages and disadvantages. In the recovery type cooling, the heat energy of the recovered steam can be effectively used because the heat energy of the cooled steam is high, but the pressure loss increases. In addition, open cooling
Since the cooled steam is combined with the turbine drive steam, it is advantageous to apply the cooling steam to parts that are difficult to cool.However, if the cooling steam pressure is not appropriate, the flow of the cooling steam to the outside of the blades becomes poor, and as a result, the turbine drive steam is deteriorated. Steam may flow into the wing.

In consideration of the above points, the conventional cooling system shown in FIG. 5 is reviewed. In the medium-high pressure turbine 3a, the supply source of the cooling steam is determined at the outlet side of the high pressure turbine 1, Since the steam cooling supply pipe 8a is provided, the pressure of the turbine driving steam is higher than the steam pressure for cooling in the blade, and there is a possibility that the turbine driving steam may flow into the blade as described above. It is necessary to review the selection of the source.

The medium and high pressure turbine 3a also preferably employs both open cooling and recovery cooling in order to improve the cooling efficiency and the heat efficiency of the plant, and this is shown in FIG. It is necessary to review the selection of the cooling steam supply source of the conventional cooling system.

The present invention has been made based on such background art, and a hydrogen combustion turbine plant which has further improved the cooling efficiency of components of a medium pressure turbine and further improved the thermal efficiency of the plant. The purpose is to provide.

[0021]

In order to achieve the above object, a hydrogen combustion turbine plant according to the present invention has at least two or more stages between a high pressure turbine and a low pressure turbine. In a hydrogen combustion turbine plant in which medium-pressure turbines are provided and the inlet steam of each medium-pressure turbine is reheated by a hydrogen combustor that burns hydrogen and pure oxygen in an equivalent amount, the turbine bleed air in the middle stage of the high-pressure turbine is subjected to the medium pressure. Extraction steam cooling supply pipe for medium pressure turbine that guides the turbine component to the cooling steam, and extraction steam recovery for medium pressure turbine that allows the hydrogen combustor to collect the turbine extraction after cooling the component of the intermediate pressure turbine. And a tube.

In order to achieve the above object, a hydrogen-combustion turbine plant according to the present invention is characterized in that the medium-pressure turbine includes at least a medium-to-high pressure turbine and a medium-to-low pressure turbine. A high-pressure hydrogen combustor and a low-pressure hydrogen combustor for heating the inlet steam to the turbine and the medium- and low-pressure turbines are provided, respectively, and the turbine extraction in the middle stage of the high-pressure turbine is guided to the components of the medium- and high-pressure turbine as cooling steam. A high-pressure turbine extracted steam cooling supply pipe, and a medium-high pressure turbine extracted steam recovery pipe for recovering the turbine extracted air after cooling the components of the medium-high pressure turbine to the high-pressure hydrogen combustor.

In order to achieve the above object, the hydrogen combustion turbine plant according to the present invention is provided with at least two stages of intermediate-pressure turbines between the high-pressure turbine and the low-pressure turbine. In a hydrogen combustion turbine plant in which the inlet steam of each intermediate pressure turbine is reheated by a hydrogen combustor that burns hydrogen and pure oxygen in an equivalent amount, a pressure reducing valve for reducing the turbine exhaust of the high pressure turbine, and a downstream of the pressure reducing valve A turbine exhaust cooling supply pipe for guiding the turbine exhaust to the components of the intermediate pressure turbine as cooling steam, and the turbine exhaust after cooling the components of the intermediate pressure turbine. And a steam recovery pipe for recovery.

In order to achieve the above object, a hydrogen-combustion turbine plant according to the present invention is characterized in that the medium-pressure turbine includes at least a medium-to-high pressure turbine and a medium-to-low pressure turbine. A high-pressure hydrogen combustor and a low-pressure hydrogen combustor for heating the inlet steam to the turbine and the medium-to-low pressure turbine, respectively; a pressure reducing valve for reducing the pressure of the turbine exhaust of the high pressure turbine; A turbine-exhaust steam cooling supply pipe for a medium- and high-pressure turbine that guides the component as cooling steam, and a steam recovery pipe for recovering the turbine exhaust after cooling the components of the medium- and high-pressure turbine to the high-pressure hydrogen combustor. Things.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a hydrogen combustion turbine plant according to the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic system diagram in which a hydrogen combustion turbine plant according to the present invention is applied to a power plant as an energy supply plant.

In the hydrogen combustion turbine plant 10, a two-stage intermediate-pressure turbine 13 composed of an intermediate-high-pressure turbine 13a and an intermediate-low-pressure turbine 13b is provided between a high-pressure turbine 11 and a low-pressure turbine 12.

A high-pressure hydrogen combustor 14 and a low-pressure hydrogen combustor 15 are installed on the turbine inlet side of the medium- and high-pressure turbines 13a and 13b constituting the medium-pressure turbine 13, respectively. Each of the hydrogen combustors 14 and 15 combusts hydrogen and pure oxygen in an equivalent amount, and supplies ultra-high-temperature steam of, for example, about 1600 ° C. or more to the medium- and high-pressure turbines 13a and 13b.

Further, a first exhaust heat recovery boiler 16 and a second exhaust heat recovery boiler 17 for recovering the exhaust heat of the high-temperature turbine exhaust are installed on the turbine exhaust side of the middle and high pressure turbines 13a and 13b, respectively. You. Each of the first and second exhaust heat recovery boilers 16 and 17 heats the water supplied from the condensate water supply system 18 and generates steam for driving the high-pressure turbine 11.

The medium-to-high pressure turbine 13a uses the turbine bleed air extracted from the middle stage of the high-pressure turbine 11 to cool the components of the medium-to-high-pressure turbine 13a, for example, the intermediate portions inside the blades such as turbine vanes and turbine blades. A medium-high-pressure turbine extraction steam cooling supply pipe 19a to be guided and a medium-high-pressure turbine extraction steam recovery pipe 19b to be recovered by the high-pressure hydrogen combustor 14 after cooling the middle portion inside the blade are provided.

The medium / high pressure turbine 13a transfers the turbine exhaust gas bypassed from the outlet side of the high pressure turbine 11 to the components of the medium / high pressure turbine 13a, for example, the leading edge and trailing edge of the turbine vanes and turbine blades. It is provided with a steam cooling supply pipe 19c for a medium-high pressure turbine, which is guided for cooling, cools the blade leading edge and the blade trailing edge, and joins the turbine driving steam.

On the other hand, the medium / low pressure turbine 13b guides the turbine exhaust bypassed from the outlet side of the high pressure turbine 11 to an intermediate portion inside the blade such as a turbine stationary blade and a turbine moving blade for cooling. A cooling supply pipe 20a and a steam recovery pipe 2 for a medium-to-low pressure turbine which is recovered by the high-pressure hydrogen combustor 14 after cooling the middle part in the blade.
0b.

The middle and low pressure turbine 13b guides the bypass steam bypassed from the outlet side of the first exhaust heat recovery boiler 16 to the leading and trailing edges of the blades such as turbine vanes and turbine blades for cooling. After cooling the leading edge and trailing edge of the blade, the cooling device further includes a bypass steam cooling supply pipe 20c for the medium / low pressure turbine that joins the turbine driving steam.

The hydrogen-fired turbine plant 10 functions as a hydrogen-fired turbine power plant, and drives the high-pressure turbine 11, each medium-pressure turbine 13 and the low-pressure turbine 12 so that each turbine 11, 12, 13 performs expansion work. In addition to rotating the generator 21 to obtain an electric output, turbine components such as turbine stationary blades and turbine blades of the medium- and high-pressure turbines 13a and 13b constituting the medium-pressure turbine 13 It is designed to be able to cope with cooling of turbines and recovery after cooling turbine component parts.

The turbine exhaust which has been working in the low-pressure turbine 12 and expanded is subsequently guided to a condenser 22 where it is cooled and condensed to be condensed. This condensate is guided to the condensate water supply system 18 by the condensate pump 23. Some condensate is discharged out of the system as needed.

On the other hand, the condensate water supply system 18 has a multi-stage low pressure feed water heater 24a, 24b, a deaerator 25, and a high pressure feed water heater 2.
6 are sequentially installed. Condensate passing through the condensate water supply system 18 is supplied to the low pressure feed water heaters 24a and 24b and the high pressure feed water heater 26.
Are sequentially heated, and the temperature rises stepwise. The heating steam of the condensed feed water is turbine exhaust from the low-pressure turbine 12 and the medium-pressure turbine 13. On the other hand, condensate water supply system 18
Condensate and water supply through the condensate pump 23 and feed water pump 2
Pumped up by 7 and pressurized.

Each feed water heater 24a, 2a of the condensate feed water system 18
4b, 26, the high-temperature (for example, about 200 ° C.) and high-pressure (for example, 350 to 500 at) water supply is performed by the first method.
Turbine exhaust (for example, at a temperature of about 1100 ° C.) guided by the exhaust heat recovery boiler 16 and the second exhaust heat recovery boiler 17 and expanded by the medium and high pressure turbines 13 a and 13 b in the respective heat recovery boilers 16 and 17. The heat is exchanged to generate higher-temperature, higher-pressure steam for driving the high-pressure turbine. This steam is returned to the inlet side of the high-pressure turbine 11,
A two-stage reheat Rankine cycle is configured.

Next, the operation of the hydrogen combustion turbine plant will be described.

The hydrogen combustion turbine plant 10 is operated based on the TS diagram shown in FIG. Condensate water supply system 18
Is heated by low-pressure feed water heaters 24a and 24b and high-pressure feed water heater 26,
° C, about 370ata). The feedwater is subsequently heated by the exhaust heat recovery boilers 16 and 17 by turbine bleed air from each of the medium- and high-pressure turbines 13a and 13b to become superheated steam. This superheated steam is, for example, 6
The steam is supplied to the high-pressure turbine 11 as high-pressure turbine driving steam at 50 ° C. and about 350 ata.
1 is driven. The turbine exhaust that has expanded and worked in the high-pressure turbine 11 is guided to the high-pressure hydrogen combustor 14 at, for example, 385 ° C. and about 75 ata. The temperature of this turbine exhaust rises due to equivalent combustion of hydrogen and pure oxygen in the high-pressure hydrogen combustor 14, for example, 1600 to 1700 ° C., 70 ° C.
The super high temperature steam of ata is guided to the medium high pressure turbine 13a of the medium pressure turbine 13, and the medium high pressure turbine 13a is driven by the ultra high temperature steam.

On the other hand, the turbine bleed air extracted from the middle stage of the high-pressure turbine 11 passes through a medium-high-pressure turbine bleed steam cooling supply pipe 19a, and the blades such as turbine vanes and turbine blades, which are components of the medium-pressure turbine 13a. After being cooled to the middle portion of each blade, the middle portion of each blade is cooled and then passed through the extraction steam recovery pipe 19b for a medium-to-high pressure turbine.
Collected in 4. Further, the turbine exhaust gas bypassed from the outlet side of the high-pressure turbine 11 is guided to the turbine leading blade and the blade trailing edge of the turbine stationary blade and the turbine rotor blade of the medium-pressure turbine 13a via the medium-high-pressure turbine steam cooling supply pipe 19c. Here, the leading edge and trailing edge of the blade are cooled, and then join the turbine drive steam.

The turbine exhaust that has expanded and worked in the medium-to-high pressure turbine 13a is guided to the first exhaust heat recovery boiler 16 at 1100 ° C. and 19 atata, for example. Heat the water supply from 18.
The steam whose temperature has dropped to about 350 ° C. by heating the feed water in the first exhaust heat recovery boiler 16 is guided to the low-pressure hydrogen combustor 15. In the low-pressure hydrogen combustor 15, the superheated steam, which has been reheated by the equivalent combustion of hydrogen and oxygen and has become a very high temperature of, for example, 1700 ° C. and 17 ata, is guided to the medium- and low-pressure turbine 13b, where it works, and works there. Drive.

On the other hand, the turbine exhaust gas bypassed from the outlet side of the high-pressure turbine 11 is guided through the turbine exhaust cooling supply pipe 20a for the medium-to-low pressure turbine to the intermediate portion inside the blades such as the turbine stationary blade and the turbine moving blade of the medium-to-low pressure turbine 13b. Then, after cooling the intermediate portion in the blade, the blade is recovered to the high-pressure hydrogen combustor 14 via the steam recovery pipe 20b for a medium-to-low pressure turbine. Further, the bypass steam bypassed from the outlet side of the first exhaust heat recovery boiler 16 is guided to the leading and trailing edges of the turbine stationary blade and the turbine moving blade, respectively, via the middle / low pressure bypass steam cooling supply pipe 20c. Here, each of the blade leading edge and the blade trailing edge is cooled, and then joins the turbine drive steam.

The turbine exhaust that has been expanded by the medium-to-low pressure turbine 13b has a temperature of about 1.4 ata and 1000 ° C.
It is guided to the waste heat recovery boiler 17, and the second waste heat recovery boiler 17 heats the water supplied from the condensate water supply system 18.

The turbine exhaust gas whose temperature has been lowered to about 150 ° C. by heating the feed water in the second exhaust heat recovery boiler 17 is subsequently guided to the low pressure turbine 12, where it works again to drive the low pressure turbine. Each turbine 11, 12, 13
Drives the generator 21 to rotate, and an electric output is obtained.

The turbine exhaust that has worked in the low-pressure turbine 12 has a temperature of, for example, 33 ° C. and is in a negative pressure state.
2 and is cooled by the condenser 22 to be condensed. This condensed water is supplied to each feed water heater 24 of the condensed water supply system 18.
a, 24b, and 26, while being heated in multiple stages, while being pressurized by the condensing pump 23 and the water supply pump 27,
(About 0 ° C.) and high pressure (about 350 ata) and are guided to the second heat recovery steam generator 16 and the second heat recovery steam generator 17, respectively.

As described above, in the hydrogen combustion turbine plant 10 according to the present embodiment, the turbine bleed at a suitable temperature for cooling extracted from the middle stage of the high-pressure turbine 11 is cooled through the medium-high-pressure turbine bleed steam cooling supply pipe 19a. After being guided to intermediate portions in the respective turbine vanes and turbine blades of the medium-high pressure turbine 13a and cooled, the high-pressure hydrogen combustor 14 is passed through a medium-high-pressure turbine extraction steam recovery pipe 19b.
The thermal efficiency of the plant can be significantly improved compared to the conventional method. Therefore, it is possible to sufficiently deal with the turbine components such as the blades.

FIG. 3 is a schematic system diagram showing a second embodiment of the hydrogen combustion turbine plant according to the present invention. In addition,
The same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof will not be repeated.

In the present embodiment, the turbine exhaust bypassed from the outlet side of the high pressure turbine 11 is
A component, for example, a turbine exhaust steam cooling / supply pipe 28 for a medium and high pressure turbine and a pressure reducing valve 29 which are guided for cooling at an intermediate portion in a blade of a turbine stationary blade and a turbine rotor blade are provided.

In this embodiment, after the pressure of the turbine exhaust of the high-pressure turbine 11 is adjusted to an appropriate pressure by providing the pressure reducing valve 29, the turbine exhaust is cooled for cooling through the medium-high pressure turbine turbine exhaust steam cooling supply pipe 28 for cooling. High pressure turbine 13a
Of the turbine vanes and turbine blades, and after cooling the intermediate portions in the blades, the high-pressure hydrogen combustor 14 collects the extracted intermediate steam through the medium-high-pressure turbine extraction steam recovery pipe 19b. 13a can also use both open-type cooling with cooling steam and recovery-type cooling.

Therefore, according to the present embodiment, the open cooling with the steam for cooling the medium and high pressure turbine 13a can be used in combination with the recovery cooling, so that the plant thermal efficiency can be greatly improved as compared with the conventional open cooling alone. Can be. In the present embodiment, the steam pressure required to cool the components of the medium-high pressure turbine 13a is adjusted by the pressure reducing valve 29. However, the present invention is not limited to this embodiment, and the pressure loss of the high-pressure hydrogen combustor 14 is increased. The pressure loss of the high-pressure hydrogen combustor 14 may be increased, and the pressure reducing valve 29 may be combined. That is, any means may be employed as long as the cooling steam for the medium-high pressure turbine 13a is appropriately adjusted.

[0051]

As described above, in the hydrogen combustion turbine plant according to the present invention, the extracted steam for the medium- and high-pressure turbine guides the turbine extraction in the middle stage of the high-pressure turbine to the components of the medium- and high-pressure turbine as cooling steam. In addition to providing a cooling supply pipe, a medium-high-pressure turbine bleed steam recovery pipe is provided to recover the turbine bleed air after cooling the components of the medium-high-pressure turbine to a high-pressure hydrogen combustor. It can be used in combination with the type cooling, and the plant thermal efficiency can be greatly improved as compared with the conventional open type cooling.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a hydrogen combustion turbine plant according to the present invention.
1 is a schematic system diagram showing an embodiment.

FIG. 2 is a TS diagram corresponding to the hydrogen combustion turbine plant shown in FIG.

FIG. 3 shows a second embodiment of the hydrogen combustion turbine plant according to the present invention.
1 is a schematic system diagram showing an embodiment.

FIG. 4 is a schematic system diagram showing an embodiment of a conventional hydrogen combustion turbine plant.

FIG. 5 is a schematic system diagram showing another embodiment of a conventional hydrogen combustion turbine plant.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High-pressure turbine 2 Low-pressure turbine 3a Medium-high-pressure turbine 3b Medium-low-pressure turbine 4a High-pressure hydrogen combustion turbine 4b Low-pressure hydrogen combustion turbine 5a, 5b Exhaust heat recovery boiler 6 Condensate water supply system 7 Generator 8a Steam cooling supply pipe for medium-high pressure turbine 8b Medium First steam cooling supply pipe for low pressure turbine 8c Second steam cooling supply pipe for medium / low pressure turbine 10 Hydrogen combustion turbine plant 11 High pressure turbine 12 Low pressure turbine 13 Medium pressure turbine 13a Medium / high pressure turbine 13b Medium / low pressure turbine 14 High pressure hydrogen combustor 15 Low pressure Hydrogen combustor 16 First waste heat recovery boiler 17 Second waste heat recovery boiler 18 Condensate water supply system 19a Extraction steam cooling supply pipe for medium and high pressure turbine 19b Extraction steam recovery pipe for medium and high pressure turbine 19c Steam cooling supply pipe for medium and high pressure turbine 20a Turbine exhaust cooling supply for medium and low pressure turbines 20b Steam recovery pipe for medium / low pressure turbine 20c Bypass steam cooling supply pipe for medium / low pressure turbine 21 Generator 22 Condenser 23 Condensate pump 24a, 24b Low pressure feedwater heater 25 Deaerator 26 High pressure feedwater heater 27 Feedwater pump 28 Medium Turbine exhaust steam cooling supply pipe for high pressure turbine 29 Pressure reducing valve

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification code FI F02C 3/34 F02C 3/34 7/18 7/18 E (56) References JP-A-7-293207 (JP, A) JP-A-2-130204 (JP, A) JP-A-2-75731 (JP, A) JP-A-5-141267 (JP, A) JP-A-10-89086 (JP, A) JP-A-9-273402 (JP JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F01K 25/00 F01K 7/38 102 F01K 7/44 F02B 43/10 F02C 3/30 F02C 3/34 F02C 7/18

Claims (4)

(57) [Claims] At least two stages of intermediate-pressure turbines are provided between a high-pressure turbine and a low-pressure turbine, and inlet steam of each of the intermediate-pressure turbines is reheated by a hydrogen combustor for burning equivalent amounts of hydrogen and pure oxygen. In the hydrogen combustion turbine plant, the turbine bleed in the middle stage of the high pressure turbine,
A medium-pressure turbine bleed steam cooling supply pipe for guiding the medium-pressure turbine components as cooling steam, and a medium-pressure turbine for recovering the turbine bleed air after cooling the medium-pressure turbine components to the hydrogen combustor A hydrogen combustion turbine plant comprising: a bleed steam recovery pipe. 2. The medium-pressure turbine includes at least a medium-high-pressure turbine and a medium-low-pressure turbine, and includes a high-pressure hydrogen combustor and a low-pressure hydrogen combustor for heating inlet steam to the medium-high-pressure turbine and the medium-low-pressure turbine, respectively. ,
Turbine bleed in the middle stage of the high-pressure turbine, a medium-high-pressure turbine bleed steam cooling supply pipe that guides the medium-high-pressure turbine components as cooling steam, and turbine bleed after cooling the medium-high-pressure turbine components, 2. The hydrogen combustion turbine plant according to claim 1, further comprising a bleed steam recovery pipe for a medium-to-high pressure turbine to be recovered by the high pressure hydrogen combustor. 3. At least two stages of intermediate-pressure turbines are provided between a high-pressure turbine and a low-pressure turbine, and inlet steam of each of the intermediate-pressure turbines is reheated by a hydrogen combustor for burning equivalent amounts of hydrogen and pure oxygen. In a hydrogen combustion turbine plant, a pressure reducing valve for reducing the pressure of the turbine exhaust gas of the high pressure turbine, and a turbine provided downstream of the pressure reducing valve for guiding the turbine exhaust gas to the components of the medium pressure turbine as cooling steam A hydrogen combustion turbine plant comprising: an exhaust cooling supply pipe; and a steam recovery pipe for recovering the turbine exhaust after cooling the components of the intermediate pressure turbine to the hydrogen combustor. 4. The medium-pressure turbine includes at least a medium-high-pressure turbine and a medium-low-pressure turbine, and includes a high-pressure hydrogen combustor and a low-pressure hydrogen combustor for heating inlet steam to the medium-high-pressure turbine and the medium-low-pressure turbine, respectively. ,
A pressure reducing valve for reducing the pressure of the turbine exhaust of the high pressure turbine, a turbine exhaust steam cooling supply pipe for the medium pressure turbine for guiding the turbine exhaust after the pressure reduction to the components of the medium pressure turbine as cooling steam, The hydrogen combustion turbine plant according to claim 3, further comprising: a steam recovery pipe for recovering the turbine exhaust after cooling the component parts to the high-pressure hydrogen combustor.