JPH07166815A - Combined power generation facility - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a combined power generation facility that can further improve efficiency without loading a special device on the current combined power generation facility and without using a heat source or energy outside this facility. To do. A composite power generation facility including a gas turbine power generator 1, a steam turbine power generator 3, and a low boiling medium turbine power generator 8 driven by a low boiling medium,
Heat that performs heat exchange between the low boiling point medium in the condensed state and the lubricating oil discharged from each turbine power generation facility installed in the preceding stage in the cycle system part of the low boiling point medium in which the low boiling point medium is in the condensed state. The exchanger 64 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in combined power generation equipment, and more particularly to a gas turbine power generator, a steam turbine power generator using the exhaust heat of this gas turbine power generator and the waste heat of this steam turbine. TECHNICAL FIELD The present invention relates to a combined power generation facility including a turbine power generation device driven by an overheated low boiling point medium obtained by exchanging heat with a low boiling point medium in a reactor.

[0002]

2. Description of the Related Art In recent years, from the viewpoint of increasing energy demand and environmental regulations, regional distributed hybrid power generation facilities have spread, and in particular, demand for packaged hybrid power generation facilities using gas turbines with high exhaust heat energy has increased. I am doing it.

As shown in FIG. 2, this type of combined power generation equipment that has been generally used in the past has a package body 1 for a gas turbine power generator, a package body 3 for a steam turbine power generator, and a low boiling point medium as a working fluid. The package body 8 of the turbine generator is provided, and the heat exchange of the drive medium is performed between the package body 8 and the package body 8.

That is, the package body 1 of the gas turbine power generator is mainly composed of an air compressor 11 for obtaining combustion air,
A gas combustor 12 that generates high-temperature and high-pressure combustion gas, a gas turbine 13 that is driven by this combustion gas, and a generator 14 that converts mechanical energy into electrical energy are provided.

A boiler 2 is installed integrally with or near the package body 1 of the gas turbine power generator, and exhaust gas from the gas turbine 13 is sent to the boiler 2. Exhaust gas is discharged to the outside after heat exchange is performed in this portion.

[0006] Heat exchange in the boiler 2 produces superheated steam which is a drive medium for the steam turbine. The superheated steam drives the steam turbine 31 of the package 3 to generate electric power in the generator 32. .

Exhaust steam from the steam turbine 31 is
It is guided to a condenser 9 installed outside the package body 3 of the steam turbine power generator, where it condenses water by exchanging heat with a low boiling point medium, and is returned to the boiler 2 by the pump 52.

The low-boiling-point medium superheated in the condenser 9 drives the turbine 81 in the package body 8 of the low-boiling-point turbine power generator, and drives the generator 82 connected thereto.

The exhaust medium from the low boiling point medium turbine 81 is cooled and condensed by cooling water in a cooler 62 installed outside the package body 8 of the low boiling point medium turbine power generator, and the condensed low boiling point medium is pumped. It is returned to the condenser 9 by 53.

The cooling water heated in the cooler 62 is sent to the cooling tower 7, where it is cooled and then returned to the cooler 62 again.

In the figure, 61 is a cooler for cooling the lubricating oil of each of these devices, 54 is its circulation pump, and 60 is a cooling tower.

Those related to these are disclosed in Japanese Patent Laid-Open Nos. 59-180012 and 4-124.
411 publication etc. are mentioned.

[0013]

In the combined power generation facility formed in this way, the driving fluid (working fluid) discharged from the gas turbine still has a high energy, and this is in turn used as a thermal energy form in the turbine. By generating electricity via the heat converter and the heat converter, heat can be utilized, and it is possible to obtain a power generation facility with high efficiency as a whole.

However, in recent years, there has been a demand for power generation equipment with higher efficiency. Therefore, although efforts have been made to improve the efficiency of each power generation device, it is not as expected. Is the reality.

That is, in the case of a device configuration mainly composed of power generation,
The power generation efficiency with respect to the input heat energy is 30% at a gas turbine power generation high rate, and the power generation efficiency when steam steam power generation is also used is 40 to 45% as a whole. When the turbine power generation driven by the low boiling point medium is further used, the power generation efficiency of the turbine power generation driven by the low boiling point medium (when Freon R114 is used as the low boiling point medium) is around 8%, and the power generation facility as a whole is 50%. Will be the limit. In other words, when the usage is power generation via a turbine or mechanical drive, it is difficult to achieve higher efficiency.

In particular, in the case of utilizing exhaust heat, the heat energy in the power generator on the downstream side is drastically reduced, and there is a dislike that the efficiency cannot be improved despite the addition of equipment.

The present invention has been made in view of the above, and an object of the present invention is not particularly to load a special device on the present combined power generation facility and to use a heat source or energy outside this facility. It is an object of the present invention to provide this kind of combined power generation facility that can further improve efficiency.

[0018]

That is, the present invention provides a combined power generation facility including a gas turbine power generator, a steam turbine power generator, and a low boiling medium turbine power generator driven by a low boiling medium, A heat exchanger that exchanges heat between the low boiling point medium in the condensed state and the lubricating oil discharged from each turbine power generation facility installed in the preceding stage in the cycle system part of the low boiling point medium in the condensed state The purpose is to achieve the intended purpose.

[0019]

In the combined power generation facility thus formed, the low boiling point medium in the condensed state undergoes heat exchange with the discharged lubricating oil, so that the low boiling point medium is preheated. Since the heat conversion is performed in the condenser after that, the temperature rises and the heat energy can be increased, and therefore, without loading a special device, and without using a heat source or energy outside this equipment, It is possible to further improve efficiency. Further, the temperature of the lubricating oil can be lowered by this heat conversion, and the cooling device for the lubricating oil can be made small in volume.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 shows the combined power generation facility in a system diagram.

Since the same parts and devices as those of the conventional device are designated by the same reference numerals, detailed description thereof will be omitted. Generally, as in the conventional case, the package body 1 of the gas turbine power generator,
Steam turbine power generator package 3 and turbine power generator package 8 that uses a low boiling point medium as a working fluid
And a boiler 2 and a condenser 9 are provided between these package bodies.

With this configuration, the respective turbines are driven while sequentially performing heat conversion, which is exactly the same as the conventional case. A major difference from the conventional one is the relationship between the cooling of the lubricating oil of each device and the heating of the low boiling point medium. That is, in the cycle system portion of the low boiling point medium in which the low boiling point medium is in a condensed state, the heat exchanger 64 for performing heat exchange between the condensed low boiling point medium and the lubricating oil discharged from each turbine power generation facility is provided. It is provided.

That is, for example, lubricating oil such as bearings is cooled by a cooler. In this case, this cooling is performed by a low boiling point medium in a condensed state.
That is, a heat exchanger 64 is provided instead of the cooler 63 in FIG. 1, and the low boiling point medium cooled and condensed in the cooler 62 cools the lubricating oil from each device in the heat exchanger 64. In other words, preliminary heating of the low boiling point medium is performed in this heat exchanger 64.

Then, the preheated low boiling point medium is returned to the condenser 9 by the pump 52 and further heated.

Generally, the exhaust heat of a gas turbine tends to have a low temperature before reaching a low boiling point medium driven turbine.
With the above-described configuration of the present invention, since the heat loss of the lubricating oil of each device is used to heat the low boiling point medium, the low boiling point medium is preheated in this portion, and the condenser is further At, the low boiling point medium is sufficiently pressurized. That is, the output of the low boiling point turbine is increased, and the efficiency is improved as a whole.

On the other hand, the lubricating oil is cooled by the heat exchanger 64 and then sent again to each device in the package bodies 1, 3, 8 of the power generator. With this configuration, it is possible to omit the cooling tower for lubricating oil.

In this case, depending on the model, the temperature of the lubricating oil may not drop to a predetermined temperature. In such a case, a cooler may be provided in the lubricating system. Of course, in this case, this cooler may have a small capacity, which is advantageous.

[0028]

As described above, according to the present invention, the low boiling point medium in the condensed state of the downstream side turbine undergoes heat exchange with the discharged lubricating oil. Is preheated and then heat conversion is performed in the condenser, its temperature rises and the heat energy can be increased.
Therefore, it is possible to obtain this kind of combined power generation facility which can be further improved in efficiency without applying a special device and without using a heat source or energy outside the facility.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of a combined cycle power generation facility of the present invention.

FIG. 2 is a system diagram showing a conventional combined cycle power generation facility.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Package body of gas turbine power generator, 2 ... Boiler, 3 ... Package body of steam turbine power generator, 7 ... Cooling tower, 8 ... Package body of turbine power generator using a low boiling point medium as working fluid, 9 ... Condensate Vessel, 11 ... Air compressor, 1
2 ... Gas combustor, 13 ... Gas turbine, 14, 32, 8
2 ... Generator, 31 ... Steam turbine, 81 ... Turbine which uses low boiling point medium as working fluid, 61 ... Cooler.

Claims (6)

[Claims] 1. A gas turbine power generator comprising a gas turbine and a generator driven by the gas turbine, and waste heat discharged from the gas turbine is recovered by a boiler and driven by steam obtained by the boiler. A steam turbine power generator comprising a steam turbine and a generator driven by the steam turbine, and a superheated low boiling point medium obtained by exchanging waste heat of the steam turbine with a low boiling point medium in a condenser. A low boiling medium turbine power generator comprising a turbine and a generator driven by the turbine, wherein the low boiling medium is condensed in a cycle system portion of the low boiling medium in a condensed state. A heat exchanger that exchanges heat between the low boiling point medium in the state and the lubricating oil discharged from each turbine power generation facility is installed. Combined power generation facility characterized by 2. A gas turbine power generator comprising a gas turbine and a generator driven by the gas turbine, and waste heat discharged from the gas turbine is recovered by a boiler and driven by steam obtained by the boiler. A steam turbine power generator comprising a steam turbine and a generator driven by the steam turbine, and a superheated low boiling point medium obtained by exchanging waste heat of the steam turbine with a low boiling point medium in a condenser. A low-boiling-point medium turbine power generator including a turbine and a power generator driven by the turbine, and each of the turbine power generators includes a lubricating oil system, wherein: The lubricating oil is cooled by the low boiling point medium in the condensed state of the low boiling point turbine power generator. Combined power generation facility to collect. 3. A gas turbine power generator comprising a gas turbine and a generator driven by the gas turbine, and waste heat discharged from the gas turbine is recovered by a boiler and driven by steam obtained by the boiler. A steam turbine power generator comprising a steam turbine and a generator driven by the steam turbine, and a superheated low boiling point medium obtained by exchanging waste heat of the steam turbine with a low boiling point medium in a condenser. A low-boiling-point medium turbine power generator including a turbine and a power generator driven by the turbine, and each of the turbine power generators includes a lubricating oil system, wherein: Lubricating oil should be cooled by using the low boiling point medium in the condensed state of the low boiling point turbine power generator as a cooling medium. Combined power generation facility characterized by 4. A gas turbine power generator comprising a gas turbine and a generator driven by the gas turbine, and waste heat discharged from the gas turbine is recovered by a boiler and driven by steam obtained by the boiler. A steam turbine power generator comprising a steam turbine and a generator driven by the steam turbine, and a superheated low boiling point medium obtained by exchanging waste heat of the steam turbine with a low boiling point medium in a condenser. A low-boiling-point medium turbine power generator including a turbine and a power generator driven by the turbine, and each of the turbine power generators includes a lubricating oil system, wherein: The lubricating oil is cooled by the low boiling point medium in the condensed state of the low boiling point turbine power generator, and further cooled. A combined cycle power generation facility characterized in that it is cooled by a cooler that uses waste water as a cooling medium. 5. A gas turbine power generator comprising a gas turbine and a generator driven by the gas turbine, and waste heat discharged from the gas turbine is recovered by a boiler and driven by steam obtained by the boiler. A steam turbine power generator comprising a steam turbine and a generator driven by the steam turbine, and a superheated low boiling point medium obtained by exchanging waste heat of the steam turbine with a low boiling point medium in a condenser. A low-boiling-point medium turbine power generation apparatus including a turbine and a generator driven by the turbine, and in each combined power generation facility in which each of the turbine power generation apparatuses includes a lubricating oil system, When the low boiling point medium is in the condensed state during the cycle process, this cools the equipment lubricating oil used for power generation equipment. Combined power generation facility characterized by doing so. 6. The combined power generation facility according to claim 1, 23, 4, or 5, wherein the gas turbine power generator, the steam turbine power generator, and the low boiling point turbine power generator are each formed in a package.