JPH03134207A - Steam turbine systems and energy supply systems - Google Patents

Abstract

PURPOSE:To make high temperature heat collectable from exhaust steam by providing an absorber, which absorbs partly the waste steam of a steam turbine by an absorbent, and a flow path which allows a cooling medium to pass through successively in the order of a condenser and the absorber. CONSTITUTION:Waste steam one part 206 from a steam turbine 20 is fed to a condenser 29, cooled by hot water 209 and condensed. While the rest of waste steam 205 is fed to an absorber 28 via a valve 37 and absorbed by a rich absorbent 208 to generate heat with the hot water heated and collected as heat collecting water 210. Here a diluted absorbent 207, output from the absorber 28, is preheated in a heat exchanger 27 by an absorbent pump 30 thereafter fed to a regenerator 24 there heat-concentrated into the rich absorbent 208 which is precooled by the heat exchanger 27 thereafter returned to the absorber 28. Thus being possible to collect high temperature heat as the heat collecting water 210 from the waste steams 205, 206 from the steam turbine 20, a steam turbine system, which supplies electric power and heat by using thermal energy, can be presented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an energy supply system that supplies electricity and heat using thermal energy, and particularly relates to an energy supply system that supplies heat by recovering heat from exhaust steam of a steam turbine. This invention relates to a steam turbine system that enables

[Conventional technology]

In urban development, research is being conducted into systems that supply electricity and heat (cold heat for air conditioning and warm heat for space heating, hot water, etc.) from energy centers to cities. One method is to generate electricity by driving a gas turbine using fuel such as gas in an energy center, and then generate steam from the exhaust gas (current applied at 400-500°C) using a waste heat recovery boiler. Systems are used that drive steam turbines to generate electricity, or directly utilize the generated steam as heat. Note that prior art related to this type of system includes, for example, Operations Research, June 1988 issue, pages 271-275.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, high-temperature exhaust heat from a gas turbine is recovered as electrical energy by a steam turbine, but no consideration is given to the recovery of thermal heat from exhaust steam.

An object of the present invention is to provide a steam turbine system that uses thermal energy to drive a steam turbine to generate electricity and recover superheat.

Another object of the present invention is to provide a composite turbine system that uses exhaust gas from a gas turbine to generate steam and drive a steam turbine, and also recovers heat from the exhaust steam of the steam turbine. .

Still another object of the present invention is to provide an energy supply system that utilizes heat recovered from exhaust steam of a steam turbine.

[Means to solve the problem]

One object of the present invention is to provide a steam turbine, a generator for supplying steam to the steam turbine, and a condenser for condensing exhaust steam from the steam turbine, and to convert a portion of the exhaust steam from the steam turbine into an absorbent. This is achieved by a steam turbine system comprising an absorber that absorbs water by a cooling medium, and a flow path for passing a cooling medium through the condenser and the face of the absorber.

In this system, steam turbine exhaust steam is not only condensed into water in a condenser, but also absorbed by an absorbent, and the cooling medium that flows to the condenser and absorber flows to the absorber via the condenser. . By doing so, it was possible to significantly increase the heat recovered from the cooling medium. For example, assuming that the exhaust steam temperature of a steam turbine is around 40°C, if only a condenser is installed, normally only the recovered heat can be obtained which is lower than the exhaust steam temperature, but if an absorber is installed, as mentioned above, By flowing a cooling medium through the condenser and absorber in this order, it was possible to increase the heat recovered by the cooling medium to 40 to 80°C.

In this way, it has become possible to supply electricity and heat using the thermal energy that is the heat source of the steam generator.

All or part of the remaining exhaust steam sent to the condenser may be sent to the absorber.

As the aqueous solution containing the absorbent supplied to the absorber, for example, a LiBr solution can be used.

At this time, it is desirable that the flow direction of the LiBr solution and the flow direction of the cooling medium passing through the absorber be opposed to each other.

By doing so, it becomes possible to further increase the heat recovered by the cooling medium. In other words, the higher the concentration of the absorbent, the more heat it generates.

By arranging the flow direction of the absorbent and the flow direction of the cooling medium to be opposite to each other, the cooling medium can be passed through a region with a high concentration of the absorbent, and the heat recovered by the cooling medium can be increased.

It is desirable to provide a valve for regulating the flow rate of exhaust steam in both the exhaust steam flow path connecting the steam turbine outlet and the condenser and the exhaust steam flow path connecting the steam turbine outlet and the absorber. By adjusting the opening degree of these valves,
The heat recovery temperature by the cooling medium can be controlled. To add to the explanation, the higher the exhaust steam pressure, the higher the recovery temperature. Therefore, if the exhaust steam from the steam turbine is taken out at multiple locations on the high-pressure side and low-pressure side, and one of them is connected to the condenser and the other to the low-pressure side, the exhaust steam flow rate control valve can be opened. By adjusting the temperature, the heat recovery temperature can be controlled.

According to the present invention, there is provided a boiler that generates steam using thermal energy, a regenerator located downstream of the boiler that heats an aqueous solution containing an absorbent using the exhaust heat of the boiler as a heat source, and generates steam; and a steam turbine driven by the steam generated in the regenerator, a condenser provided on the outlet side of the steam turbine to condense a part of the steam turbine exhaust steam into water, and an outlet side of the steam turbine. A steam turbine system can be provided that includes an absorber that absorbs at least a portion of the remaining steam turbine exhaust steam provided in the steam turbine with an absorbent, and a flow path that passes a cooling medium through the condenser and the absorber in this order.

With such a system, the steam generated in the regenerator can also be used to drive the steam turbine, making it possible to further increase the amount of power generated by the steam turbine.

When using a regenerator, a corrosive aqueous solution such as a LiBr solution is concentrated to generate steam, so the regenerator cannot be heated to a very high temperature. If the heating temperature is high, the container or piping system will be corroded by the solution and damaged. Therefore, it is desirable to provide a boiler before the regenerator and heat the regenerator using the exhaust heat of the boiler as a heat source.

By doing this, the boiler is first heated with high-temperature thermal energy, and the exhaust heat whose temperature has decreased due to heating the boiler is used to heat the regenerator, which causes the problem of corrosion caused by the absorption liquid. It is possible to increase the amount of power generated by the steam turbine while avoiding this.

Between the above-mentioned regenerator and the absorber provided at the outlet side of the steam turbine, there is a path that absorbs the steam turbine exhaust steam and sends the diluted absorbent-containing aqueous solution from the absorber to the regenerator, and a route that conveys the diluted absorbent-containing aqueous solution from the absorber to the regenerator. It is highly desirable to have a path for conveying the absorbed absorbent-containing aqueous solution from the regenerator to the absorber.

By communicating the absorber and the regenerator through the piping system in this manner, the solution containing the absorbent can be circulated and used.

It is desirable to provide a mist removal device between the regenerator and the steam turbine to remove mist from the steam generated in the regenerator. The water vapor generated by the regenerator often contains mist. If steam containing mist is sent to a steam turbine, the steam turbine will be corroded. In order to prevent this, it is desirable to provide a mist removal device equipped with, for example, a hydrophobic porous membrane.

It is also desirable to provide an economizer for boiler feedwater heating downstream of the regenerator. By providing an economizer for heating boiler feed water, it is possible to suppress a drop in the exhaust heat temperature of the boiler and increase the temperature of steam generated from the regenerator, thereby improving the power generation efficiency of the steam turbine.

In order to effectively utilize the thermal energy for steam generation, it is also desirable to provide a low-temperature boiler after or before the regenerator and send the steam generated by the low-temperature boiler to the steam turbine. In this case, if the low temperature boiler is heated using the exhaust heat of the regenerator or the high temperature boiler, there is no need to separately provide a heat source for heating the low temperature boiler.

When both a high-temperature boiler and a low-temperature boiler are provided, it is desirable to provide a valve that adjusts the flow rate of water supplied to the high-temperature boiler and a valve that adjusts the flow rate of water supplied to the low-temperature boiler. By adjusting the flow rate of water supplied to these boilers, the amount of steam generated can be controlled and the amount of power generated can be controlled.

The present invention also provides a gas turbine, a steam generator that generates steam by heating using the exhaust gas of the gas turbine as a heat source,
a steam turbine driven by the steam generated by the steam generator; a condenser located on the outlet side of the steam turbine to condense a part of the steam turbine exhaust steam; A steam turbine driven by steam from a regenerator; a condenser provided on the outlet side of the steam turbine to condense a part of the steam turbine exhaust steam into water; and a condenser provided on the outlet side of the steam turbine. The present invention provides a steam turbine system including an absorber for absorbing at least a portion of the remaining steam turbine exhaust steam by an absorbent, and a flow path for passing a cooling medium through the condenser and the absorber in this order.

Furthermore, a gas turbine, a boiler that is heated using the exhaust gas of the gas turbine as a heat source to generate steam, and a boiler that is located downstream of the boiler and uses the exhaust heat of the boiler as a heat source to heat an aqueous solution containing an absorbent to generate steam. a steam turbine driven by the steam generated by the boiler and the regenerator; and a condenser provided on the outlet side of the steam turbine to condense a part of the steam turbine exhaust steam into water. ,
Steam comprising an absorber provided on the exit side of the steam turbine for absorbing at least a portion of the remaining steam turbine exhaust steam with an absorbent, and a flow path for passing a cooling medium through the condenser and the absorber in this order. Provides turbine systems.

In this case, it is desirable to provide a high-temperature boiler and a low-temperature boiler as boilers, and to provide a regenerator between these two boilers or after the low-temperature boiler.

The temperature of the exhaust gas from a gas turbine can be as high as around 500'C. If the solution containing the absorbent is heated and concentrated using such high-temperature exhaust gas as a direct heat source for the regenerator, the container containing the absorbent solution and the piping system will be corroded and damaged. Therefore, a boiler is installed before the regenerator, and the high-temperature exhaust gas from the gas turbine first heats the boiler to generate high-temperature steam, and the exhaust gas whose temperature has decreased due to the generation of steam is sent to the regenerator to heat the regenerator. This becomes effective.

With this configuration, 1. a combined power generation system including a gas turbine and a steam turbine can be provided.

Note that it is also possible to supply some or all of the steam from the regenerator to the gas turbine, and in this case there is an effect that the amount of power generated by the gas turbine can be increased.

In the steam turbine system of the present invention, the cooling medium whose temperature has increased after passing through the absorber is used as a heat source for an absorption chiller, a heat source for a water heater, a heat source for heating equipment, a heat source for preheating various materials, or a heat source for preheating various materials. It can be used as a heat source for drying. By guiding a cooling medium to these heat utilization devices, an energy supply system capable of supplying both electrical energy and thermal energy can be created.

The present invention generates steam from a heat source fluid such as exhaust gas or fuel of a gas turbine and sends it to a steam turbine to generate power or rotational energy, and at the same time absorbs at least a portion of the steam turbine exhaust steam with an absorbent to generate heat. It also provides an energy supply method that recovers energy as

In addition, as a prior art in which the exhaust steam of a steam turbine is absorbed by an absorbent to recover thermal heat, there is a prior art in Proceedings of the 25th Japan Heat Transfer Symposium (1988-6), No. 205.
There are ~207 pages. Also, related to JP-A-51-4
There is an invention described in Publication No. 4747.

The present inventors focused on the conventional steam turbine Rankine cycle and absorption Rankine cycle, and investigated ways to recover thermal energy more efficiently than heated gas and generate power and heat. Then, the following measures (a) to (9j) were discovered.

(,) In order to improve the power generation efficiency of a steam turbine, the high-temperature portion of the heating source gas is used to evaporate water to generate high-temperature, high-pressure steam and send it to the steam turbine.

(b) In order to recover thermal heat from turbine exhaust steam, the medium-temperature part of the heating source gas is used to heat and regenerate the dilute absorbent used for thermal heat recovery, and at the same time, the generated water vapor is sent to the steam turbine and used for power generation.

(c) In order to lower the exhaust temperature of the heating source gas and use the heat effectively, the heating source gas low-temperature section is used to heat the feed water and send it to the high-temperature section boiler, or the water is further evaporated into low-pressure steam. is sent to the steam turbine.

(d) Exhaust steam from the steam turbine is transferred to a conventional condenser and an absorber to absorb the heat of condensation, and the heat of steam condensation is raised and recovered as thermal heat.

(e) In order to generate electricity and recover heat using the gas turbine exhaust gas, an absorbent regeneration boiler and absorber are installed in addition to a water boiler and a condenser.

(f) In order to increase the amount of power generated by the gas turbine, superheated steam generated from the absorption boiler and low-pressure steam generated from the low-temperature boiler are sent to the gas turbine combustor.

(g) In order to recover high-temperature heat better than the absorber, the flow direction of the absorbent and the flow direction of the recovered hot water are made to flow in opposite directions.

(h) In order to vary and adjust the ratio of heat and air that can be supplied by this system (thermal ratio), multiple turbine bleed pipes are installed so that the inflow steam pressure to the absorber can be varied.

(i) A mist separator equipped with a hydrophobic porous membrane or the like is installed in the flow path between the boiler for regenerating the absorbent and the steam turbine in order to remove the mist entrained by the steam of the absorbent.

(j) In order to prevent pitting corrosion caused by local heating of the regenerator, water vapor generated by exhaust gas heating is used as a heating source for the regenerator.

[Effect]

By taking the above measures, the following effects are produced.

(1) Generate high-pressure, high-temperature steam for power generation from the high-temperature side of the heated gas for each temperature level, regenerate absorbent for recovering heat at elevated temperatures, preheat feed water, and generate low-pressure steam for effective use of thermal energy from the gas. As a result, thermal energy can be used effectively, power can be generated with high efficiency, and heat can be recovered from exhaust steam.

(2) By combining a gas turbine and an absorption Rankine cycle, high-efficiency power generation and high-efficiency heat recovery become possible.

(3) The amount of power generation increases by sending superheated steam to the combustor of the gas turbine.

(4) By making the absorbent in the absorber and hot water flow in counterflow, high-temperature heat can be recovered without reducing power generation efficiency.

(5) In urban development, as the heat and electricity demands of the city change, the system needs to be able to change accordingly, and the thermoelectric ratio can be easily changed by changing the exhaust steam pressure to the absorber.

(6) Absorbents are generally more corrosive than water, so it is absolutely necessary to prevent the mist from flowing into the steam turbine. Hydrophobic porous membranes are water repellent (water repellent), so Droplets can also be removed.

(7) Heating the regenerator at a higher temperature generates high-temperature, high-pressure steam and increases the amount of power generation, but local heating with high-temperature exhaust gas tends to cause pitting corrosion, making it impossible to raise the exhaust gas temperature. Therefore, in order to prevent local heating, by using steam that can be heated at a uniform temperature, pitting corrosion can be prevented and steam at a higher temperature can be generated.

〔Example〕

Examples of the present invention will be described in detail below.

FIG. 1 shows a first embodiment of the invention. The main features of the configuration are that a superheater 21, a high temperature boiler 22, an absorbent regenerator 24, and a low temperature boiler 25 are installed in this order after the exhaust gas 103 of the gas turbine 10, and an economizer that heats the feed water is installed in front of each boiler. 23 is installed. Furthermore, an absorber 28 and a condenser (condenser) 29 are installed downstream of the steam turbine 20. Furthermore, a mist removal device 26 having a hydrophobic porous membrane is installed at the regenerator outlet, and a portion of the steam from the regenerator 24 and the low-temperature boiler 25 is sent to the piping 201, 203 to be sent to the combustor 12 of the gas turbine. have. Furthermore, the structure of the absorber 28 is such that the high concentration absorbent 208 and the heat recovery water 210 flow in opposite directions, so that the high concentration absorbent 208 and the heat recovery water 210 flow in opposite directions.
is high temperature heat recovery water (absorber outlet side) and dilute absorbent 20
7 is in indirect contact with the low temperature heat recovery water (absorber inlet side). This structure takes advantage of the fact that absorbents (e.g. aqueous solutions of lithium bromide, calcium chloride, lithium chloride, etc.) can absorb water vapor even at high temperatures as the concentration increases. It has the effect of

Next, the operation of the heat and power supply system according to the present invention will be explained.

After the air 100 is compressed by the compressor 11, it enters the combustor 12, where it is combusted together with the fuel 101, and the combustion gas 102 enters the gas turbine 10, where the generator 13 generates electricity. High temperature (approximately 400 to 500° C.) exhaust gas from the gas turbine 10 passes through a superheater 21, a high court boiler 22, an economizer 23, a regenerator 24, a low temperature boiler 25, and an economizer 23, and is released into the atmosphere as exhaust gas 104.

Condensate 200 from the condenser 29 is sent to the economizer 23 by a feed water pump 31 and heated, and then a portion passes through a valve 32 and enters the low-temperature boiler 25, where it becomes low-pressure steam 201 and is sent to the steam turbine 20. Sent. The remaining feed water passes through the valve 33, is further heated by the economizer 23, enters the high-temperature boiler 22, becomes high-pressure steam 202, is further heated by the superheater 21, and is sent to the steam turbine 20 in the state of superheated steam 204. The dilute absorbent 207 leaving the absorber 28 is transferred to the heat exchanger 27 by the absorbent pump 3o.
After being preheated in the heat exchanger 27, it is sent to the regenerator 24, where it is heated and concentrated to become a concentrated absorbent 208, precooled in the heat exchanger 27, and then returned to the absorber 28. After the mist-containing water vapor generated in the regenerator 24 is removed by a mist removal device 26, only the water vapor 203 is sent to the steam turbine 2o.

As described above, it becomes possible to effectively utilize thermal energy down to low temperatures in the exhaust gas for generating high-temperature, high-pressure steam in the high-temperature zone, for regenerating absorbent in the medium-temperature zone, and for low-temperature boilers and economizers in the low-temperature zone.

In the conventional absorption Rankine cycle, the exhaust gas temperature is 20
It is high at about 0°C (in the present invention, it can be used up to about 120°C), and the generated water vapor is low at about 2 to 10 ata, but in the present invention, high pressure steam of 30 to 60 ata and 2 to 10 ata
of low-pressure steam can be generated.

Superheated steam 204 leaving the superheater 21 flows into the high-pressure side of the steam turbine 20 , and superheated and saturated steam 201 , 203 generated from the regenerator 24 and low-temperature boiler 25 flows into the steam turbine 20 from the intermediate-pressure side, where they are generated by the generator 13 . You can get electricity.

A portion 206 of the exhaust steam from the steam turbine 20 is sent to a condenser 29 where it is cooled and condensed with hot water 209.

The remaining exhaust steam 205 enters the absorber 28 through the valve 37, is absorbed by the concentrated absorbent 208, generates heat, and heats the hot water.
It can be recovered as heat recovery water 210 of about 0°C to 80°C.

Here, the rotational energy obtained from the gas turbine 10 and the steam turbine 20 can also directly generate cold heat for cooling by directly connecting a turbo chiller or the like instead of the generator 13.

In addition, the steam generated from the regenerator 24 is superheated steam, so
By sending the power to the combustor 12 of the gas turbine via the valve 35 as necessary, the amount of power generated by the gas turbine can be increased. A similar effect may be achieved by sending the steam 201 from the low temperature boiler 25 through the valve 34.

In the present invention, as a method of changing the thermoelectric ratio, increasing the amount of heat recovery (reducing the amount of power generation) is done by adjusting the water supply 200 with valves 32 and 33, and reducing the amount of water supplied to the high-temperature boiler 23 to reduce the amount of high-pressure steam. Therefore, the amount of power generation decreases, and conversely, the temperature of the regenerator 24 increases, which increases the concentration of the absorbent, and at the same time the temperature of the absorber increases, the amount of steam flowing into the absorber increases, so the heat recovery from the absorber increases. The amount increases. Another method is to take out the exhaust steam from the turbine as high-pressure steam through the valve 36, thereby reducing the steam turbine output and increasing the pressure in the absorber 28, thereby obtaining higher temperature heat recovery water.

In order to increase the amount of power generation, the amount of water supplied to the high temperature boiler 22 is increased by adjusting the valves 34 and 35 to increase the amount of high pressure steam generated.
In addition, by lowering the cooling temperature of the absorber 28, the turbine back pressure can be lowered and power generation efficiency can be increased. As mentioned above,
The thermoelectric ratio can be adjusted by adjusting the water supply system valves 34.35 and the exhaust steam system valves 36.37.

Figure 2 shows an example of a compact system with high power generation efficiency. In the system of the present invention, focusing on the low contribution rate of low-pressure steam generated from a low-temperature boiler to power generation, the low-temperature zone of the exhaust gas is limited to the economizer 23' for heating the feed water, and the rest is the same as that in Fig. 1, and is compact. This is an attempt to simplify and simplify the process. In this example, the amount of power generation increases because the amount of high-pressure steam generated increases, but the amount of steam absorbed into the absorber is limited, so the amount of heat recovered is lower than in Figure 1. This is advantageous as a compact system.

FIG. 3 shows an embodiment of a system that can reduce problems caused by absorbent corrosion in the regenerator. This is done by heating the regenerator with steam in order to prevent pitting corrosion (local pinhole-like holes are formed due to corrosion) that occurs where the absorbent is locally heated.

The system uses only an economizer 23 and an intermediate pressure boiler 25' after the middle temperature part of the exhaust gas, and uses a part of the steam generated in the intermediate pressure boiler 25' to heat the regenerator 24' and regenerate the absorbent. be.

Low pressure superheated steam 203' generated in the regenerator 24' flows into the low pressure section of the steam turbine 20. The rest is the same as in FIG. In this embodiment, corrosion troubles in the regenerator can be prevented and reliability is increased, and heat is recovered from the exhaust gas 103 only by the water boiler, and the amount of water vapor in the medium pressure boiler is reduced by the valve 34'.
36' has the advantage that the thermoelectric ratio (absorber/capacitor ratio) can be easily changed.

〔Effect of the invention〕

According to the present invention according to claims 1 to 3, it is possible to recover high-temperature heat from the exhaust steam of a steam turbine, and it is possible to provide a steam turbine system that supplies electricity and heat using thermal energy. .

According to the fourth aspect of the invention, the heat recovered by the cooling medium flowing through the absorber can be made to a higher temperature.

According to the invention set forth in claim 5, it is possible to control the temperature of the heat recovered from the exhaust steam of the steam turbine.

According to the inventions described in claims 6 and 8, thermal energy for steam generation can be effectively used from high to low temperatures, and the amount of power generated by the steam turbine can be increased. Corrosion of the absorbent storage container of the regenerator and the piping system through which the absorbent flows can also be reduced.

According to the invention set forth in claim 7, it is possible to improve the efficiency of the steam turbine while circulating the absorbent in the absorber to and from the regenerator.

According to the invention set forth in claim 9, the problem of mist in the water vapor generated in the regenerator can be avoided.

According to the invention described in claim 1o, it is possible to increase the temperature of the steam generated in the regenerator and improve the power generation efficiency.

According to the invention set forth in claim 11, thermal energy for steam generation can be used more effectively, and the amount of power generated by the steam turbine can be increased.

According to the invention set forth in claim 12, in addition to the effects based on the invention set forth in claim 11, it is possible to effectively utilize the absorbent.

According to the invention set forth in claim 13, it becomes possible to control the amount of power generated by the steam turbine.

According to the invention described in claims 14 to 16, it is possible to provide a composite power generation system in which a gas turbine and a steam turbine are combined.

According to the invention described in claims 17 and 18, a method for supplying electricity and heat from thermal energy is provided.

According to the invention described in claims 19 and 2Q, it is possible to provide an energy supply system that utilizes thermal heat recovered from steam turbine exhaust steam.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing one embodiment of the present invention, FIG. 2 is a schematic diagram showing another embodiment, and FIG. 3 is a schematic diagram showing still another embodiment. 1o...Gas turbine, 20...Steam turbine, 2
2... High temperature boiler, 23... Economizer, 24...
... Regenerator, 25... Low temperature boiler, 26... Mist removal device.

Claims (1)

[Claims] 1. A steam turbine system comprising a steam turbine, a generator for supplying steam to the steam turbine, and a condenser for condensing exhaust steam from the steam turbine, comprising: What is claimed is: 1. A steam turbine system comprising: an absorber that absorbs a portion of water with an absorbent, and a flow path through which a cooling medium passes through the condenser and the absorber in this order. 2. a steam turbine; a steam generator located on the inlet side of the steam turbine; a condenser located on the outlet side of the steam turbine to condense a portion of the steam turbine exhaust steam; and a steam generator located on the outlet side of the steam turbine. A steam turbine comprising: an absorber located at the absorber for absorbing at least a portion of the remaining steam turbine exhaust steam using an absorbent; and a cooling medium passage passing through the condenser and the absorber in this order. system. 3. A steam generator, a steam turbine driven by the steam generated by the steam generator, and a steam turbine provided on the outlet side of the steam turbine, which condenses a part of the steam turbine exhaust steam to water. an absorber that absorbs at least a portion of the remaining exhaust steam with an absorbent; and a cooling medium flow path that passes through the condenser and the absorber in this order. steam turbine system. 4. The steam turbine system according to any one of claims 1 to 3, further comprising a flow path for an absorbent to flow into the absorber in opposition to the flow of the cooling medium. 5. In any one of claims 1 to 3, an exhaust steam flow path connecting the outlet of the steam turbine and the condenser and an exhaust steam flow path connecting the outlet of the steam turbine and the absorber, respectively, are provided. A steam turbine system characterized by being provided with a valve for regulating steam flow rate. 6. A boiler that generates water vapor using thermal energy; a regenerator that is located after the boiler and uses the exhaust heat of the boiler as a heat source to heat an aqueous solution containing an absorbent to generate water vapor; the boiler and the boiler; a steam turbine driven by steam generated in a regenerator; a condenser provided on the outlet side of the steam turbine to condense a part of the steam turbine exhaust steam into water; and an outlet side of the steam turbine. An absorber for absorbing at least a portion of the remaining steam turbine exhaust steam provided in the steam turbine with an absorbent, and a flow path for passing a cooling medium through the condenser and the absorber in this order. steam turbine system. 7. In claim 6, there is provided a path for transmitting the absorbent-containing aqueous solution diluted by absorbing the steam turbine exhaust steam from the absorber to the regenerator, and a route for transmitting the absorbent-containing aqueous solution concentrated by the regenerator to the regenerator. A steam turbine system comprising a path for sending from a regenerator to the absorber. 8. A boiler that generates steam using thermal energy; a regenerator that is located after the boiler and uses the exhaust heat of the boiler as a heat source to heat an aqueous solution containing an absorbent to generate steam; the boiler and the regenerator; A steam turbine driven by steam generated in a regenerator, and a condenser provided on the outlet side of the steam turbine to condense a part of the steam turbine exhaust steam into water. steam turbine system. 9. A boiler that generates steam using thermal energy; a regenerator that is located after the boiler and uses the exhaust heat of the boiler as a heat source to heat an aqueous solution containing an absorbent to generate steam; a mist removal device that removes mist in the generated steam; a steam turbine driven by the steam generated in the boiler and the steam from the regenerator from which the mist is removed by the mist removal device; a condenser provided on the outlet side of the steam turbine to condense a portion of the steam turbine exhaust steam into water; and a condenser provided on the outlet side of the steam turbine to condense at least a portion of the remaining steam turbine exhaust steam with an absorbent. A steam turbine system comprising: an absorber for absorbing water; and a flow path through which a cooling medium passes through the condenser and the absorber in this order. 10. A boiler that generates steam using thermal energy; a regenerator that is located after the boiler and uses the exhaust heat of the boiler as a heat source to heat an aqueous solution containing an absorbent to generate steam; An economizer for heating the feed water of the boiler located in the latter stage, a steam turbine driven by the steam generated in the boiler and steam from the regenerator, and a steam turbine exhaust installed on the outlet side of the steam turbine. a condenser that condenses a portion of steam to water; and an absorber provided on the outlet side of the steam turbine that absorbs at least a portion of the remaining steam turbine exhaust steam with an absorbent; 1. A steam turbine system comprising a flow path through which a cooling medium passes through the absorber and the absorber in this order. 11. A high-temperature boiler that generates water vapor using thermal energy; and a regenerator that is located after the high-temperature boiler and uses the exhaust heat of the high-temperature boiler as a heat source to heat an aqueous solution containing an absorbent to generate water vapor; A low-temperature boiler that is located after the regenerator and generates steam using the exhaust heat used to heat the regenerator as a heat source, and steam that is driven by the steam generated in the two boilers and the steam from the regenerator. a turbine; a condenser provided on the exit side of the steam turbine to condense a portion of the steam turbine exhaust steam into water; and a condenser provided on the exit side of the steam turbine to condense a portion of the steam turbine exhaust steam into water; What is claimed is: 1. A steam turbine system comprising: an absorber that absorbs a portion of water with an absorbent, and a flow path through which a cooling medium passes through the condenser and the absorber in this order. 12. In claim 11, there is provided a path for transmitting the absorbent-containing aqueous solution diluted by absorbing the steam turbine exhaust steam from the absorber to the regenerator, and a route for transmitting the absorbent-containing aqueous solution concentrated by the regenerator to the regenerator. A steam turbine system comprising a path for sending from a regenerator to the absorber. 13. The steam turbine system according to claim 11, further comprising a valve that adjusts the flow rate of water supplied to the high temperature boiler and a valve that adjusts the flow rate of water supplied to the low temperature boiler. 14. A gas turbine; a steam generator that generates steam by heating the exhaust gas of the gas turbine as a heat source; a steam turbine driven by the steam generated by the steam generator; and an outlet of the steam turbine. a condenser located on the side of the steam turbine and condensing a part of the steam turbine exhaust steam; an absorber located on the exit side of the steam turbine and absorbing at least a part of the remaining steam turbine exhaust steam with an absorbent; A steam turbine system comprising a condenser and a cooling medium flow path passing through the absorber in this order. 15. A gas turbine, a boiler that is heated using the exhaust gas of the gas turbine as a heat source and generates steam, and a boiler located after the boiler that heats an aqueous solution containing an absorbent using the exhaust heat of the boiler as a heat source to generate steam. a path for supplying at least a portion of heated steam generated in the regenerator to the gas turbine; a steam turbine driven by the steam generated in the boiler and the regenerator; and a steam turbine driven by the steam generated in the boiler and the regenerator. a condenser provided on the outlet side of the steam turbine to condense a portion of the steam turbine exhaust steam into water; and a condenser provided on the outlet side of the steam turbine for condensing at least a portion of the remaining steam turbine exhaust steam using an absorbent. What is claimed is: 1. A steam turbine system comprising: an absorber for absorbing water, and a flow path for passing a cooling medium through the condenser and the absorber in this order. 16. A gas turbine; a high-temperature boiler that generates steam using the exhaust gas of the gas turbine as a heat source; a low-temperature boiler that is located after the high-temperature boiler and generates steam using the exhaust heat of the high-temperature boiler as a heat source; the low-temperature boiler A regenerator is located at the latter stage and uses part of the steam generated in the low-temperature boiler as a heat source to heat an aqueous solution containing an absorbent to generate steam, and a regenerator is used to generate steam by heating an aqueous solution containing an absorbent. a steam turbine driven by the steam turbine, a condenser provided on the outlet side of the steam turbine to condense a part of the steam turbine exhaust steam into water, and a steam turbine exhaust provided on the outlet side of the steam turbine. A steam turbine system comprising: an absorber that absorbs at least a portion of the remaining steam using an absorbent; and a flow path through which a cooling medium passes through the condenser and the absorber in this order. 17. An energy supply method characterized by generating steam from a heat source fluid and sending it to a steam turbine to obtain power generation or rotational energy, and at the same time absorbing at least a portion of the steam turbine exhaust steam with an absorbent and recovering it as thermal heat. . 18. An energy supply method according to claim 17, characterized in that steam is generated from high-temperature exhaust gas from a gas turbine and sent to the steam turbine. 19. In a system comprising a steam turbine, a generator for supplying steam to the steam turbine, and a condenser for condensing exhaust steam from the steam turbine, a part of the exhaust steam from the steam turbine is absorbed by an absorbent. 1. An energy supply system comprising: an absorber for cooling; a flow path for passing a cooling medium through the condenser and the absorber in this order; and the cooling medium flow path is ultimately led to heat utilization equipment. 20, a steam turbine; a steam generator located on the inlet side of the steam turbine; a condenser located on the outlet side of the steam turbine to condense a portion of the steam turbine exhaust steam; and a steam generator located on the outlet side of the steam turbine. an absorber for absorbing at least a portion of the remaining steam turbine exhaust steam with an absorbent; and a coolant flow path passing through the condenser and the absorber in this order, the coolant flow path being An energy supply system characterized by being ultimately led to heat utilization equipment.