JP2001289008A - Gas turbine system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas turbine system capable of recovering the moisture included in the exhaust gas from a turbine and using it as the reforming steam. SOLUTION: This gas turbine system is provided with a compressor 2 for compressing the air, a reformer 20 for reforming the fuel gas, an evaporator 13 for generating the steam and feeding it to the reformer 20, a burner 4 for burning the air from the compressor 2 and the reformed gas from the reformer 20, and a turbine 6 for converting the combustion gas from the burner to the motive power. The exhaust gas from the turbine 6 is fed to the reformer 20 and the evaporator 13. A moisture condensing and recovering unit 35 for recovering the moisture included in the exhaust gas is connected to a downstream side of the evaporator 13, and the water recovered by the moisture condensing and recovering unit 35 is fed to the evaporator 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas turbine system for chemically reforming fuel using exhaust gas from a turbine, and more particularly to recovering a steam component in the exhaust gas and effectively using water resources. The present invention relates to a gas turbine system capable of performing the above.

[0002]

2. Description of the Related Art In recent years, as a means different from a combined cycle for improving efficiency by recovering heat from exhaust gas, fuel supplied to a turbine is chemically reformed by thermal energy contained in the exhaust gas, and the fuel is regenerated. Proposals have been made to improve the efficiency of the entire system by recovering exhaust heat by improving chemical energy.

At present, natural gas is widely used as a fuel for gas turbines, and the main component of natural gas is methane. As a typical method of reforming methane, a method is known in which methane is converted to hydrogen and carbon monoxide by adding steam to methane and maintaining the temperature at a high temperature in the presence of a catalyst such as nickel.

FIG. 6 shows an example of such a gas turbine system. In the gas turbine system shown in FIG. 6, air 1 is compressed by a compressor 2 into high-pressure air 3, and is burned in a combustor 4 together with a reformed fuel 21 containing hydrogen reformed in a reformer 20. At this time, the injection steam 16 is injected into the combustor 4 in some cases.

The high-temperature and high-pressure combustion gas 5 that has become high temperature in the combustor 4 generates power when expanded in the gas turbine 6,
The low-pressure gas turbine exhaust gas 7 is obtained. The gas turbine exhaust gas 7 is reformed by heating a high-pressure raw fuel 19 such as methane in a reformer 20, and becomes a reformer exhaust gas 8 having a reduced temperature as a reformed fuel 21 containing hydrogen. The reformer exhaust gas 8 is deprived of heat by the water 10 pressurized by the pump 11 in the evaporator 13, and is exhausted to the outside as the evaporator exhaust gas 9 at about atmospheric pressure at about 100 ° C. to 200 ° C. .

The water that has taken heat from the reformer exhaust gas 8 in the evaporator 13 becomes steam 14 and reforming steam 22. The reforming steam 22 is mixed with the high-pressure raw fuel 19 obtained by compressing the raw fuel 17 such as methane by the fuel compressor 18,
The heat of the gas turbine exhaust gas 7 is received by the reformer 20, the reforming reaction occurs as described above, and the reformed fuel 21 containing hydrogen is used.
Becomes On the other hand, the steam 14 passes through the steam valve 15 and is injected into the combustor 4 as injection steam 16.

A gas turbine system using such steam reforming of methane is disclosed, for example, in Japanese Patent Application Laid-Open No. 2-286.
835. Also, with respect to a system for recovering and using a water vapor component from a gas turbine exhaust gas, many systems have been considered in order to increase the efficiency of the gas turbine.
2006 and JP-A-11-117764.

[0008]

As described above, a gas turbine system having a reformer 20 for chemically reforming methane or the like requires a large amount of steam at the time of reforming. The water used for the steam is supplied from outside the system and then discharged as exhaust gas, so that water resources are not effectively used. Further, since a large amount of water vapor is contained in the exhaust gas, mist is generated when the exhaust gas is discharged from the chimney, and white smoke rises, resulting in an environmental problem.

In a conventional gas turbine system, a system for recovering water vapor from exhaust gas has been proposed in Japanese Patent Application Laid-Open No. H11-117664. When the steam recovery system shown in these is directly applied to a gas turbine system that performs fuel reforming, the amount of recovered steam is large, so a cold heat source for producing a large amount of low-temperature cooling water required for water recovery Therefore, the steam recovery system tends to be larger than other components of the gas turbine system, and is not necessarily a practical system in terms of installation area and cost. Further, for example, Japanese Patent Application Laid-Open No. H11-1177
In the water recovery system devised as 64, a cooling medium for recovering steam is sprayed on the exhaust gas by spraying, and condensed recovered water and the cooling medium are discharged together with the exhaust gas. For this reason, there is a problem that it is actually difficult to condense and recover steam.

[0010] The present invention has been made in view of the above points, and in a gas turbine system having a reformer for chemically reforming fuel, a practical gas turbine capable of effectively utilizing water resources. The purpose is to provide a system.

[0011]

SUMMARY OF THE INVENTION The present invention comprises a compressor for compressing a fluid containing oxygen for combustion, a reformer for chemically reforming a fuel gas to produce a reformed gas, and a steam generator for producing steam. And a combustor that burns the reformed gas sent from the reformer via the reformed gas pipe by the fluid from the compressor and the combustion gas generated by the combustor. The exhaust gas from the turbine is supplied to the reformer and the evaporator via an exhaust gas pipe, and the exhaust gas pipe on the downstream side of the evaporator condenses and collects the water vapor in the exhaust gas. Is a gas turbine system provided with a water condensation and recovery device for sending water to an evaporator.

According to the present invention, a water condensation / recovery device is provided in the exhaust gas pipe, and the collected water is sent to the evaporator to generate steam, and the steam is sent to the reformer. It can be used in a reformer. Therefore, it is not necessary to supply water from outside the system in order to supply steam to the reformer.

The present invention is a gas turbine system characterized in that an exhaust gas pipe on the inlet side of the water condensation and recovery apparatus and an exhaust gas pipe on the outlet side of the water condensation and recovery apparatus are connected by a gas heat exchanger.

According to the present invention, the exhaust gas on the outlet side of the water condensation and recovery apparatus is heated by the gas heat exchanger, so that the exhaust gas containing water vapor near the saturation concentration is cooled once, and the exhaust gas temperature rises. , Resulting in a lower relative humidity.
Therefore, mist generation can be suppressed, and white smoke can be prevented.

According to the present invention, there is provided a water condensation and recovery apparatus, wherein a water recovery heat exchanger connected to an exhaust gas pipe through which exhaust gas flows, a cooling medium pipe through which a cooling medium flows, and condensed water from the water recovery heat exchanger. A gas turbine system comprising a tank.

According to the present invention, since the water condensing and recovering device comprises the water collecting heat exchanger and the tank, the cooling medium for the water collecting heat exchanger uses a naturally large amount such as air and seawater. Therefore, it is not necessary to newly secure water resources as a cooling medium, and as a result, water resources can be used effectively. In addition, by installing a tank for storing condensed water, even when the amount of water used decreases due to load fluctuation, the collected water can be stored, so that there is no waste.

The present invention is a gas turbine system characterized in that a cooling medium pipe on the outlet side of a water recovery heat exchanger is connected to a tank.

According to the present invention, since the cooling medium on the outlet side of the water recovery heat exchanger is connected to the tank, the cooling medium such as water used for cooling is heated by the water recovery heat exchanger and directly converted into steam. Because it can be used, water resources can be used effectively.

The present invention is characterized in that the water recovery heat exchanger is a direct contact heat exchanger for exchanging heat by directly contacting exhaust gas from an exhaust gas pipe with a cooling medium from a cooling medium pipe. System.

According to the present invention, since the water recovery heat exchanger is a direct contact heat exchanger in which the exhaust gas and the cooling medium are brought into direct contact to exchange heat, no equipment for mixing the cooling medium and the condensed water is required, and the installation area is reduced. Can be smaller. In addition, the water recovery heat exchanger can be made inexpensive by making it a direct contact type as compared with one in which a number of heat transfer tubes are arranged or various plate types, and it becomes more practical.

According to the present invention, in the water condensation and recovery apparatus, a water recovery heat exchanger connected to an exhaust gas pipe through which exhaust gas flows, a tank for storing condensed water from the water recovery heat exchanger, and condensed water from the tank flow. A gas turbine system, comprising: an additional heat exchanger connected to a water pipe and a cooling medium pipe through which a cooling medium flows, wherein the water pipe on the outlet side of the additional heat exchanger is connected to a water recovery heat exchanger. It is.

According to the present invention, the water condensation and recovery apparatus has a water recovery heat exchanger, a tank, and an additional heat exchanger, so that a place where a large amount of clean water cannot be obtained, such as a water purification plant. Even when the gas turbine system is installed in the gas turbine, since a large amount of air or seawater can be used as a cooling medium for cooling, the condensed water can be easily collected.

According to the present invention, the water recovery heat exchanger is a direct heat exchanger for exchanging heat by bringing exhaust gas from an exhaust gas pipe into direct contact with condensed water from an additional heat exchanger. It is.

According to the present invention, the additional heat exchanger is a direct contact heat exchanger for exchanging heat by bringing exhaust gas and water into direct contact with each other. It can be made cheaper and more practical than exchangers.

According to the present invention, there is provided a gas turbine system wherein the additional heat exchanger and the tank are integrally formed.

According to the present invention, there is no need to provide a tank separately from the additional heat exchanger, and the installation area can be reduced.

According to the present invention, there is provided a gas turbine system provided with means for removing gas in the condensed water from the condensed water in the tank.

According to the present invention, it is possible to prevent the gas in the condensed water, for example, carbon dioxide and water, from producing carbonated water, and prevent the supply pipe to the reformer from being corroded by the carbonated water. Material can be cheaper.

According to the present invention, the water recovery heat exchanger is a shelf type direct contact heat exchanger, and the flow rate of the exhaust gas when leaving the direct contact heat exchanger is about 6 m / s or less. It is a turbine system.

According to the present invention, since the water recovery heat exchanger is a shelf-type direct contact heat exchanger and the exhaust gas exits the direct contact heat exchanger at a flow velocity of about 6 m / s or less, Even if it is directly sprinkled, the cooling water does not fly out and is discharged together with the exhaust gas, so that it becomes a more practical direct contact heat exchanger.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a first embodiment of a gas turbine system according to the present invention.

In FIG. 1, a gas turbine system includes a compressor 2 for compressing a fluid containing fuel oxygen, for example, air 1.
And a reformer 2 that chemically reforms a fuel gas (high-pressure raw fuel) 19 such as methane to produce a reformed gas (reformed fuel) 21.
0, an evaporator 13 that generates steam from water and sends it to the reformer 20, and a high-pressure air 3 from the compressor 2.
A combustor 4 for burning the reformed fuel 21 sent from the fuel cell via a reformed gas pipe 52 and a turbine 6 for converting the high-temperature and high-pressure combustion gas generated by the combustor 4 into power.

An exhaust gas pipe 50 is connected to the turbine 6. The exhaust gas pipe 50 is provided with the above-described reformer 20 and the evaporator 13 in order, and further connected to the exhaust gas pipe 50 downstream of the evaporator 13. A water condensation and recovery device 35 is provided, which condenses and collects water vapor in the evaporator exhaust gas 9 and sends the collected condensed water to the evaporator 13.

That is, the water pipe 51 is connected to the water condensation and recovery device 35, and the water condensation and recovery device 35 and the evaporator 1 are connected.
A pump 11 for sending condensed water to the evaporator 13 is attached to a water pipe 51 between the evaporator 13 and the water pipe 51.

The evaporator 13 is connected to steam pipes 53 and 53a for sending steam 14 and reforming steam 22 to the combustor 4 and the reformer 20, respectively. The steam pipe 53 is provided with a steam valve 15. ing.

In FIG. 1, a fuel compressor 18 is provided on the inlet side of the reformer 20 to pressurize the raw fuel 17 to produce a high-pressure raw fuel 19.

Next, the operation of the present embodiment having such a configuration will be described.

First, the air 1 is compressed by the compressor 2 to become high-pressure air 3. The high-pressure air 3 is compressed together with the reformed gas (reformed fuel) 21 containing hydrogen sent from the reformer 20 by the combustor 4.
Burned in. At this time, the steam 14 sent from the evaporator 13 at the same time becomes the injection steam 16 via the steam valve 15 and is injected into the combustor 4.

The high-temperature and high-pressure combustion gas 5 that has exited the combustor 4 expands in the gas turbine 6 to generate power, and becomes low-pressure gas turbine exhaust gas 7.

On the other hand, a raw fuel 17 such as methane is pressurized by a fuel compressor 18 to become a high-pressure raw fuel 19, which is sent to a reformer 20. In the reformer 20, the gas turbine exhaust gas 7 heats the high-pressure raw fuel 19 such as methane, and the temperature is reduced to become the reformer exhaust gas 8.
On the other hand, the high-pressure raw fuel 19 is mixed with the reforming steam 22 in the reformer 20 to cause a reforming reaction to become the reformed fuel 21 containing hydrogen.

The reformer exhaust gas 8 becomes the evaporator exhaust gas 9 after the evaporator 13 further heats the evaporator condensed water 31 sent from the water condensation and recovery device 35. Evaporator exhaust gas 9
Is condensed by a water condensation and recovery device 35 and separated into condensed water 33 and final exhaust gas 32. The final exhaust gas 32 is discharged into the atmosphere, a part of the condensed water 33 becomes the condensed water 31 for the evaporator, and the rest is discharged as wastewater 34.

The condensed water for the evaporator heated by the reformer exhaust gas 8 in the evaporator 13 becomes steam 14 and reforming steam 22. As described above, the reforming steam 22 receives the heat of the gas turbine exhaust gas 7 in the reformer 20, causes a reforming reaction, and becomes the reformed fuel 21 containing hydrogen.

As described above, according to the present embodiment, the water condensation and recovery device 35 is attached to the final exhaust gas portion, and the evaporator condenser 31 which is a part of the recovered condensed water is pumped by the pump 1.
The pressure is increased by 1 and supplied to the evaporator 13. Therefore, it is not necessary to supply water from outside the system in order to produce the reforming steam 22, and water resources can be used effectively.

Second Embodiment Next, a gas turbine system according to a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the exhaust gas pipes 50 on the inlet side and the outlet side of the water condensation / recovery device 35 are used.
Is connected to a gas heat exchanger (white smoke prevention device) 36.

In FIG. 2, the same parts as those in the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and detailed description is omitted.

In FIG. 2, air 1 is compressed by a compressor 2 to form high-pressure air 3. The high-pressure air 3 is burned in a combustor 4 together with a reformed fuel 21 containing hydrogen generated in a reformer 20. At this time, the injection steam 16 is injected into the combustor 4. When the high-temperature and high-pressure combustion gas 5 that has exited the combustor 4 expands in the gas turbine 6, it generates power and becomes low-pressure gas turbine exhaust gas 7. The low-pressure gas turbine exhaust gas 7 is deprived of heat by the high-pressure raw fuel 19 such as methane in the reformer 20, and its temperature decreases to become the reformer exhaust gas 8. On the other hand, the high-pressure raw fuel 19 is mixed with the reforming steam 22 to become the reformed fuel 21 containing hydrogen. After the reformer exhaust gas 8 is further deprived of heat by the evaporator 13, it becomes the evaporator exhaust gas 9. The evaporator exhaust gas 9 enters the white smoke prevention device 36 and exchanges heat with the moisture condensation / recovery device exhaust gas 32 a to become the white smoke prevention device exhaust gas 9 a whose temperature has dropped to about the dew point of the evaporator exhaust gas 9.

The exhaust gas 9a of the white smoke prevention device is a water condensation and recovery device 35, and the condensed water 33 and the water condensation and recovery device exhaust gas 32a
Is separated into The moisture exhaust gas 32a enters the white smoke prevention device 36, exchanges heat with the evaporator exhaust gas 9 to increase the temperature, becomes the final exhaust gas 32 having a low relative humidity, and is discharged into the atmosphere. On the other hand, the water condensation and recovery device 35
A part of the condensed water 33 recovered in the liquid state becomes the condensed water 31 for the evaporator, and the rest is discharged as drainage 34.

The condensed water for the evaporator, which has removed heat from the evaporator exhaust gas 8 in the evaporator 13, becomes steam 14 and reforming steam 22, and the reforming steam 22 is sent to the reformer 20. On the other hand, the steam 14 passes through the steam valve 15 and passes through the steam 16 for injection.
And enters the combustor 4 as described above.

According to the present embodiment, the white smoke prevention device 36
As a result, the temperature of the white smoke prevention device exhaust gas 9a entering the steam component recovery device 35 can be lowered to reduce the heat load of the water condensation and recovery device 35 and at the same time the relative humidity of the final exhaust gas 32 can be reduced. Not only can be made compact, but also white smoke can be prevented and the impact on the environment can be reduced.

Third Embodiment Next, a third embodiment of the gas turbine system according to the present invention will be described with reference to FIG. In the third embodiment, the exhaust gas pipe 36 downstream of the white smoke prevention device 36 and the cooling medium pipe 54 are connected by a water recovery heat exchanger 39, and a tank is provided downstream of the water recovery heat exchanger 39. 40 are provided.

In FIG. 3, a water condensation / recovery device 35 is constituted by the water recovery heat exchanger 39 and the tank 40. In FIG. 3, the same portions as those of the second embodiment shown in FIG. 2 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The air 1 is compressed by the compressor 2 to become high-pressure air 3, and the high-pressure air 3 is combusted in the combustor 4 together with the reformed fuel 21 generated in the reformer 20. At this time, the injection steam 16 is injected into the combustor 4. When the high-temperature and high-pressure combustion gas 5 discharged from the combustor 4 expands in the gas turbine 6, it generates power and becomes low-pressure gas turbine exhaust gas 7. The gas turbine exhaust gas 7 is supplied to the fuel reformer 20
The heat is taken by the high-pressure raw fuel 19 such as methane, and the temperature is lowered to become the reformer exhaust gas 8. On the other hand, the high-pressure raw fuel 19 is mixed with the reforming steam 22 to become the reformed fuel 21 containing hydrogen. After the reformer exhaust gas 8 is further deprived of heat by the evaporator 13, it becomes the evaporator exhaust gas 9. The evaporator exhaust gas 9 enters the white smoke prevention device 36 and exchanges heat with the condenser exhaust gas 32a to lower the temperature to about the dew point of the evaporator exhaust gas 9 to become the white smoke prevention device exhaust gas 9a.

The flue gas 9a of the white smoke prevention device exchanges heat with a cooling medium such as seawater or the atmosphere 37 in a water recovery heat exchanger 39, and is then separated into condensed water 33 and condenser exhaust gas 32a.
At this time, the temperature of the seawater or the air rises, and the seawater or the air is discharged out of the system as discharged seawater or the air 38.

The condenser exhaust gas 32a is supplied to the white smoke prevention device 36.
Then, the temperature rises due to heat exchange with the evaporator exhaust gas 9, and the final exhaust gas 32 having a low relative humidity is discharged to the atmosphere. On the other hand, after the condensed water 33 accumulates in the tank 40, a part becomes the condensed water 31 for the evaporator, and
Is discharged as

The condensed water for the evaporator, which has taken heat from the reformer exhaust gas 8 in the evaporator 13, becomes steam 14 and reforming steam 22, and the reforming steam 22 is sent to the reformer 20. On the other hand, the steam 14 passes through the steam valve 15 and passes through the steam 16 for injection.
Is injected into the combustor 4.

According to the present embodiment, since the water condensing and recovering device 35 has the tank 40 for storing the condensed water 33, even if the amount of the condensed water 33 temporarily increases due to a load fluctuation or the like, the water condensing and recovering device 35 can be used. 40 can be stored. For this reason, a temporary increase in the drainage 34 can be prevented, and the effect on the environment can be reduced. On the other hand, condensed water 33
Even if the amount of water is temporarily reduced, the water stored in the tank 40 can be used.
The amount of steam to be supplied to the fuel cell can be secured. By providing such a tank 40, it is possible to provide a system with less environmental influence even when the load changes.

By using a cooling medium such as air or seawater 37 as a cooling medium for the water recovery heat exchanger 39,
The white smoke prevention device exhaust gas 9a can be cooled in the water recovery heat exchanger 39. In addition, since a large amount of air and seawater can flow, the flow rate in the water recovery heat exchanger 39 can be increased. Therefore, the cooling temperature can be kept low,
The temperature of discharged air and seawater after heat recovery can be kept low. Therefore, the influence on the environment can be reduced and the condenser performance can be improved, and the water recovery heat exchanger 39 can be reduced in size.

Fourth Embodiment Next, a fourth embodiment of the gas turbine system according to the present invention will be described with reference to FIG. In the fourth embodiment, a cooling medium pipe downstream of the water recovery heat exchanger 39 is connected to a tank.

In FIG. 4, the same portions as those of the third embodiment shown in FIG. 3 are denoted by the same reference numerals, and detailed description is omitted.

In FIG. 4, air 1 is compressed by compressor 2 to become high-pressure air 3, and high-pressure air 3 is combusted in combustor 4 together with reformed fuel 21 containing hydrogen generated in reformer 20. At this time, the injection steam 16 is injected into the combustor 4. When the high-temperature and high-pressure combustion gas 5 discharged from the combustor 4 expands in the gas turbine 6, it generates power and becomes low-pressure gas turbine exhaust gas 7. The gas turbine exhaust gas 7 is deprived of heat by the high-pressure raw fuel 19 such as methane in the fuel reformer 20, and its temperature decreases to become the reformer exhaust gas 8.

On the other hand, the high pressure raw fuel 19 is
And reformed fuel 21 containing hydrogen. After the reformer exhaust gas 8 is further deprived of heat by the evaporator 13, it becomes the evaporator exhaust gas 9. The evaporator exhaust gas 9 enters the white smoke prevention device 36 and exchanges heat with the condenser exhaust gas 32a to reduce the temperature to the exhaust gas 9.
, The exhaust gas 9a of the white smoke prevention device has dropped to about the dew point of

The flue gas 9 a of the white smoke prevention device exchanges heat with a cooling medium such as purified water 41 in a water recovery heat exchanger 39 to form condensed water 33.
And a condenser exhaust gas 32a. At this time, clean water 41
Rises in temperature to become high-temperature purified water 42 and is led to the tank 40. The condenser exhaust gas 32a enters the white smoke prevention device 36, exchanges heat with the white smoke prevention device exhaust gas 9a, increases in temperature, becomes the final exhaust gas 32 having a low relative humidity, and is discharged into the atmosphere.

On the other hand, after the condensed water 33 accumulates in the tank 40, a part becomes the condensed water 31 for the evaporator, and the rest is purified water 43.
Is supplied outside the system and used.

The condensed water for the evaporator, which has taken heat from the reformer exhaust gas 8 in the evaporator 13, is converted into steam 14 and reforming steam 2
2 and the reforming steam 22 is sent to the reformer 20. On the other hand, the steam 14 passes through the steam valve 15 and is injected into the combustor 4 as injection steam 16.

According to the present embodiment, since the condensed water 33 and the purified water 42 used as the cooling medium are introduced into the same tank 40, a part of the condensed water 33 can be used as purified water. In addition, by using the purified water 41 as a cooling medium of the water recovery heat exchanger 39, not only the white smoke prevention device exhaust gas 9a can be cooled, but also a part of the condensed water 31 can be used as the purified water 43. For this reason, there is no drainage, and the impact on the environment can be reduced.

The water recovery heat exchanger 39 can be a direct contact heat exchanger, and the size of the heat exchanger can be reduced.

Fifth Embodiment Next, a fifth embodiment of the gas turbine system according to the present invention will be described with reference to FIG. In the fifth embodiment, the water condensation and recovery device is configured by a water recovery heat exchanger 39, a tank 40, and an additional heat exchanger 44.
The rest is substantially the same as the fourth embodiment shown in FIG.

In FIG. 5, the same portions as those of the fourth embodiment shown in FIG. 4 are denoted by the same reference numerals, and detailed description is omitted.

In FIG. 5, air 1 is compressed by compressor 2 to become high-pressure air 3, and high-pressure air 3 is combusted in combustor 4 together with reformed fuel 21 containing hydrogen generated in reformer 20. At this time, the injection steam 16 is injected into the combustor 4. When the high-temperature and high-pressure combustion gas 5 discharged from the combustor 4 expands in the gas turbine 6, it generates power and becomes low-pressure gas turbine exhaust gas 7. The gas turbine exhaust gas 7 is deprived of heat by the high-pressure raw fuel 19 such as methane in the reformer 20,
The temperature is reduced to become the reformer exhaust gas 8. On the other hand, the high-pressure raw fuel 19 is mixed with the reforming air to form a reformed fuel 21 containing hydrogen.
Becomes After the reformer exhaust gas 8 is further deprived of heat by the evaporator 13, it becomes the evaporator exhaust gas 9. The evaporator exhaust gas 9 is
The flue gas 9a which enters the white smoke prevention device 36 and exchanges heat with the condenser flue gas 32a and the temperature falls to about the dew point of the flue gas 9
Becomes

The exhaust gas 9a exchanges heat with the cooling water 47 sent from the additional heat exchanger 44 in the water recovery heat exchanger 39, and is separated into condensed water 33 and condenser exhaust gas 32a. At this time, the cooling water 47 in the water recovery heat exchanger 39 is guided to the tank 40 together with the condensed water 33. The condenser exhaust gas 32a enters the white smoke prevention device 36 and exchanges heat with the evaporator exhaust gas 9 to increase the temperature, and becomes the final exhaust gas 32 having a low relative humidity, and is discharged into the atmosphere.

On the other hand, after the condensed water 33 accumulates in the tank 40, the condensed water 33 is discharged from the water pipe 51, and is divided into the cooling water 46, the condensed water 31 for the evaporator, and the waste water 34. Among them, the cooling water 46 in the water pipe 51 exchanges heat with the cooling medium such as seawater or the atmosphere 37 flowing through the cooling medium pipe 54 by the additional heat exchanger 44 to lower the temperature and becomes the cooling water 47. At this time, the temperature of the seawater or the air 37 rises, and the seawater or the air 37 is discharged as a discharge cooling medium such as the discharged seawater or the air 38.

The condensed water 31 for the evaporator takes heat from the reformer exhaust gas 8 in the evaporator 13 to become steam 14 and reforming steam 22, and the reforming steam 22 is sent to the reformer 20. on the other hand,
The steam 14 passes through the steam valve 15 and passes through the steam 1 for injection.
6 is injected into the combustor 4.

According to the present embodiment, the additional heat exchanger 44
Is provided, even if purified water cannot be used as a cooling medium for the water recovery heat exchanger 39, cooling water can be used as a method for cooling the white smoke prevention device exhaust gas 9a. For this reason, especially when cooling is required in the atmosphere, the condenser can be made smaller, and the effect of reducing the installation area can be obtained.

The water recovery heat exchanger 39 can also be a direct contact heat exchanger, which can reduce the size of the heat exchanger and the installation area.

Further, in such a configuration, the water recovery heat exchanger 39 and the tank 40 may be formed integrally, thereby reducing the installation area.

Further, the tank 40 may be provided with a degassing device 47 for degassing gas such as carbon dioxide. In this case, the degassing device 47 can prevent carbon dioxide from dissolving in the condensed water and reduce the acidity. For this reason, it is possible to use a cheap material for the piping member, and a more practical system can be provided.

Further, as the water recovery heat exchanger 39, a shelf type direct contact heat exchanger may be used. At this time, the flow rate of the exhaust gas 32a from the water recovery heat exchanger 39 is set to 6 m / s or less. Thus, the condensed water from the water recovery heat exchanger 39 can be prevented from being discharged together with the exhaust gas 32a, and the condensed water can be efficiently recovered.

[0078]

As described above, according to the structure of the present invention, in a gas turbine system having a reformer for chemically reforming fuel, water in exhaust gas from a turbine is effectively recovered. It can be used as steam for reforming. Therefore, a practical system that can effectively utilize water resources can be provided.

[Brief description of the drawings]

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

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

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

FIG. 4 is a schematic diagram showing a fourth embodiment of the gas turbine system according to the present invention.

FIG. 5 is a schematic view showing a fifth embodiment of the gas turbine system according to the present invention.

FIG. 6 is a system configuration diagram showing a conventional gas turbine system.

[Explanation of symbols]

 2 Compressor 4 Combustor 6 Gas Turbine 13 Evaporator 18 Fuel Compressor 20 Fuel Reformer 35 Water Condensation Recovery Device 36 White Smoke Prevention Device 39 Water Recovery Heat Exchanger 40 Tank 44 Additional Heat Exchanger 48 Deaerator

Claims (10)

[Claims] 1. A compressor for compressing a fluid containing oxygen for combustion, a reformer for chemically reforming a fuel gas to produce a reformed gas, and an evaporator for producing steam and sending it to the reformer. A combustor that burns the reformed gas sent from the reformer via the reformed gas pipe by the fluid from the compressor, and a turbine that converts the combustion gas generated in the combustor into power. Exhaust gas from the turbine is supplied to the reformer and evaporator via an exhaust gas pipe, and water vapor in the exhaust gas is condensed and collected in an exhaust gas pipe downstream of the evaporator, and the condensed water collected is sent to the evaporator for water condensation and recovery. A gas turbine system provided with a device. 2. The gas turbine system according to claim 1, wherein the exhaust gas pipe on the inlet side of the water condensation and recovery apparatus and the exhaust gas pipe on the outlet side of the water condensation and recovery apparatus are connected by a gas heat exchanger. 3. A water condensation and recovery device includes a water recovery heat exchanger connected to an exhaust gas pipe through which exhaust gas flows and a cooling medium pipe through which a cooling medium flows, and a tank for storing condensed water from the water recovery heat exchanger. The gas turbine system according to claim 1, further comprising: 4. The gas turbine system according to claim 3, wherein a cooling medium pipe on an outlet side of the water recovery heat exchanger is connected to the tank. 5. The water recovery heat exchanger is a direct contact heat exchanger for exchanging heat by bringing exhaust gas from an exhaust gas pipe into direct contact with a cooling medium from a cooling medium pipe.
A gas turbine system as described. 6. A water condensation / recovery device, comprising: a water recovery heat exchanger connected to an exhaust gas pipe through which exhaust gas flows, a tank for storing condensed water from the water recovery heat exchanger, and a water pipe through which the condensed water flows from the tank. 2. An additional heat exchanger connected to a cooling medium pipe through which the cooling medium flows, and a water pipe on the outlet side of the additional heat exchanger is connected to the water recovery heat exchanger. Gas turbine system. 7. The water recovery heat exchanger according to claim 6, wherein the heat recovery heat exchanger is a direct heat exchanger for exchanging heat by directly contacting exhaust gas from an exhaust gas pipe with condensed water from an additional heat exchanger. Gas turbine system. 8. The gas turbine system according to claim 7, wherein the additional heat exchanger and the tank are integrally formed. 9. The gas turbine system according to claim 7, wherein a means for removing gas in the condensed water from the condensed water is provided in the tank. 10. The water recovery heat exchanger is a shelf-type direct contact heat exchanger, wherein the flow rate of exhaust gas leaving the direct contact heat exchanger is about 6 m / s or less. A gas turbine system as described.