KR102164816B1 - Power plant systems for enhancement of efficiency and reduction of heat rate - Google Patents

Abstract

A power generation system is provided for improving efficiency and reducing heat consumption. A power generation system for improving efficiency and reducing heat consumption according to an exemplary embodiment of the present invention includes a high-pressure turbine, a medium-pressure turbine, and two low-pressure turbines, and includes a turbine unit connected to a generator; A plurality of pump units for condensing the steam discharged from the low-pressure turbine in a condenser and supplying the condensed condensate; A plurality of feed water heaters for heating the feed water supplied from the plurality of pump units through steam extracted from the turbine unit; A boiler for heating the feed water supplied from the feed water heater to generate high-temperature superheated steam and then supplying the superheated steam to the high-pressure turbine; A reheater for reheating steam discharged from the high-pressure turbine and supplying it to the medium-pressure turbine; And a heat consumption rate reducing unit for increasing the pressure and temperature of the main steam supplied from the boiler to the high-pressure turbine, wherein the heat consumption rate reducing unit is a feed water heater closest to the boiler among the plurality of feed water heaters, and It is an additional feed water heater disposed between the boilers, and the additional feed water heater heats the feed water supplied from the nearest feed water heater using the high-temperature and high pressure steam extracted from the inlet side of the high-pressure turbine, and then goes to the boiler side. Supply.

Description

Power plant systems for enhancement of efficiency and reduction of heat rate

The present invention relates to a power generation system operated by a reheating and regeneration Rankine cycle, and more particularly, to a power generation system capable of improving the efficiency of a power generation power conversion system and reducing heat consumption.

Power plants generate electricity through the power conversion system. That is, the power conversion system converts thermal energy obtained through combustion of fuels (uranium, coal, oil, gas, etc.) into mechanical energy through a turbine and then into electrical energy through a generator.

This power conversion system is basically operated by reheating and regenerative Rankine cycle, and is composed of devices such as boiler-turbine, generator-pluralizer-heater-pump, and the like, and the smaller the value of heat consumption, the better the thermal efficiency of the cycle.

By the way, the thermal efficiency of the cycle is changed by factors such as the configuration of the cycle, the temperature or flow rate of the bleed steam, the temperature and pressure of the main steam, and the temperature of the reheated steam.

In particular, in recent years, as high-temperature materials have been developed, high-temperature steam is in progress. That is, the mass class (500MWe or above) thermal power plant is the main steam of the condition (for example) the temperature and pressure of 247kg / cm ² in 566 ℃ a reheat steam condition in the degree of USC (Ultra-Super Critical) Plant Type 593 ℃ Main steam conditions (example) are being upgraded to A-USC (Advanced Ultra-Super Critical) Plant Type, where the temperature of 700℃ and pressure of 350kg/cm ² and reheat steam conditions (example) are about 730℃.

The electrical output and heat consumption ratio of the A-USC type power plant (800 MWe class example) compared to the USC type according to the steam conditions are as shown in FIG. 1. However, when the thermal power plant is upgraded to the A-USC Plant Type, there is a problem that the cost increases because related facilities must be constructed using high-temperature heat-resistant materials if necessary.

Large-capacity thermal power plants are being constructed as an A-USC plant type that can increase efficiency, and a plan to further improve efficiency is required.

An object of the present invention is to provide a power generation system for improving efficiency and reducing heat consumption that can improve the thermal efficiency of the entire cycle and reduce the heat consumption rate by improving the arrangement of some devices constituting the regeneration and reheat Rankine cycle.

According to an aspect of the present invention, a turbine unit including a high-pressure turbine, a medium-pressure turbine and two low-pressure turbines and connected to a generator; A plurality of pump units for condensing the steam discharged from the low-pressure turbine in a condenser and supplying the condensed condensate; A plurality of feed water heaters for heating the feed water supplied from the plurality of pump units through steam extracted from the turbine unit; A boiler for heating the feed water supplied from the feed water heater to generate high-temperature superheated steam and then supplying the superheated steam to the high-pressure turbine; A reheater for reheating steam discharged from the high-pressure turbine and supplying it to the medium-pressure turbine; And a heat consumption rate reducing unit for increasing the pressure and temperature of the main steam supplied from the boiler to the high-pressure turbine, wherein the heat consumption rate reducing unit is a feed water heater closest to the boiler among the plurality of feed water heaters, and It is an additional feed water heater disposed between the boilers, and the additional feed water heater heats the feed water supplied from the nearest feed water heater using the high-temperature and high pressure steam extracted from the inlet side of the high-pressure turbine, and then goes to the boiler side. Provides a power generation system for improving supply efficiency and reducing heat consumption.

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According to another aspect of the present invention, a turbine unit comprising a high pressure turbine, a first medium pressure turbine, a second medium pressure turbine and two low pressure turbines and connected to a generator; A plurality of pump units for condensing the steam discharged from the low-pressure turbine in a condenser and supplying the condensed condensate; A plurality of feed water heaters for heating the feed water supplied from the plurality of pump units through steam extracted from the turbine unit; A boiler for heating the feed water supplied from the feed water heater to generate high-temperature superheated steam and then supplying the superheated steam to the high-pressure turbine; A reheater for reheating steam discharged from the high-pressure turbine and supplying it to the first medium-pressure turbine; And a heat consumption rate reducing unit for increasing both the pressure and temperature of the main steam supplied from the boiler to the high-pressure turbine and the temperature of the reheat steam supplied to the second medium-pressure turbine, wherein the first medium-pressure turbine comprises the A medium-pressure turbine receiving reheated steam from a reheater, and the heat consumption rate reduction unit includes: an additional feed water heater disposed between the boiler and a feed water heater closest to the boiler among the plurality of feed water heaters, and the first medium pressure An additional reheater for reheating the steam discharged from the turbine and supplying the reheated reheated steam to the second medium pressure turbine, wherein the additional water heater uses high temperature and high pressure steam extracted from the inlet side of the high pressure turbine. It provides a power generation system for improving efficiency and reducing heat consumption by heating water supplied from the nearest water heater and then supplying it to the boiler.

According to this embodiment, the steam temperature at the outlet of the boiler may be 700°C or higher, and the steam temperature at the outlet of the additional reheater may be 730°C or higher.

According to this embodiment, steam discharged from the second medium pressure turbine may be introduced into the low pressure turbine.

According to the present embodiment, the plurality of water heaters may be a mixed water heater including a deaerator.

According to the present invention, by additionally disposing at least one of a medium pressure turbine, a water heater, and a reheater constituting the regeneration and reheat Rankine cycle, it is possible to improve the thermal efficiency of the entire cycle and reduce the heat consumption rate.

1 is a graph comparing electrical output and heat consumption rates of a general USC type power plant and an A-USC type power plant.
2 is a view showing a power generation system for improving efficiency and reducing heat consumption according to an embodiment of the present invention.
3 is a diagram showing a power generation system for improving efficiency and reducing heat consumption according to another embodiment of the present invention.
4 is a view showing a power generation system for improving efficiency and reducing heat consumption according to another embodiment of the present invention.
5 is a graph showing the output and heat consumption of a general large-capacity power generation system and a power generation system for improving efficiency and reducing heat consumption according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. The present invention may be implemented in various different forms, and is not limited to the embodiments described herein. In the drawings, parts not related to the description are omitted in order to clearly describe the present invention, and the same reference numerals are added to the same or similar components throughout the specification.

The power generation system (100, 200, 300) for improving efficiency and reducing heat consumption according to an embodiment of the present invention includes a turbine unit 110, a plurality of pump units 131, 132, and a plurality of water heaters as shown in FIGS. (141-147), a boiler 160, a reheater 170, and a heat consumption rate reduction unit (180,280,380).

The turbine unit 110 may include a high-pressure turbine 111 through which high-pressure steam is introduced, a medium-pressure turbine 112 through which medium-pressure steam is introduced, and a low-pressure turbine 113a and 113b through which low-pressure steam is introduced.

Here, the medium pressure turbine 112 may be at least one or more, and the low pressure turbines 113a and 113b may be plural, for example, two.

Such a turbine unit 110 may be driven by connecting the high-pressure turbine 111, the medium-pressure turbine 112 and the low-pressure turbines 113a and 113b through a single rotation shaft, and the rotation shaft is connected to the generator 190 Electricity can be produced. However, the connection relationship between the turbine unit 110 and the generator 190 is not limited thereto, and the high-pressure turbine 111, the medium-pressure turbine 112 and the low-pressure turbines 113a and 113b are provided with the generator ( 190) can also be connected separately.

At this time, the high-temperature, high-pressure main steam obtained through combustion of fuel in the boiler 160 may be introduced into the high-pressure turbine 111, and the high-pressure main steam expands in the high-pressure turbine 111 and The temperature can all go down.

In addition, the steam discharged from the high-pressure turbine 111 may be introduced into the medium-pressure turbine 112 after the temperature rises through the reheater 170. Such reheated steam may be moved to the low pressure turbines 113a and 113b after both pressure and temperature are lowered while expanding in the medium pressure turbine 112.

In addition, the steam introduced into the low pressure turbines 113a and 113b may move toward the condenser 120 after both pressure and temperature are lowered while expanding in the low pressure turbines 113a and 113b.

Here, the condenser 120 may condense the low-temperature, low-pressure saturated steam discharged from the low-pressure turbines 113a and 113b to restore a plurality of them, and the saturated steam introduced into the condenser 120 may contain seawater or atmosphere. It can be restored to a plurality by cooling using.

To this end, the condenser 120 may be connected to a circulating water system (CWS) 122 in which seawater or cooling water circulates.

The plurality of pump units 131 and 132 supply the plurality of condensed condensed in the condenser 120 to the plurality of feed water heaters 141 to 144 or increase the supply pressure of the plurality of feed water heaters in a state in which the plurality of feed water heaters ( 141-147) side can be provided.

To this end, the plurality of pump units 131 and 132 include a plurality of pumps 131 connected between the condenser 120 and the axial sealed vapor recuperator 124, the axial sealed vapor recuperator (GSC) 124 and a plurality of water supply. It may include a plurality of boosting pumps 132 connected between the hot air (141-147). Here, the shaft-sealed steam condenser 124 is for cooling and condensing exhaust from the shaft-sealed steam machine, and may be connected between the multiple booster pump 132 and the condenser 120.

The plurality of feed water heaters (141-147) may heat a plurality of water supplied to the boiler 160 through the plurality of pump units (131,132), and a plurality of water supply heaters (141-147) are sequentially arranged to be supplied to the boiler (160). A plurality of temperatures can be sequentially raised.

In this case, the plurality of water heaters 141 to 147 may heat the plurality of water using steam extracted from the turbine unit 110.

To this end, the plurality of feed water heaters (141-147) may be connected to at least one of the high-pressure turbine 111, the medium-pressure turbine 112, and the low-pressure turbine (113a, 113b) through the bleed pipe 149. In addition, the water supply moving toward the boiler 160 may be heated using steam extracted through the extraction pipe 149.

For example, the plurality of feed water heaters (141-147) may be a mixed feed water heater in which steam extracted from the turbine unit 110 is directly mixed with feed water and heated, and degassing the air contained in the feed water. It may include a deaerator (148) for making.

As a specific example, there may be a total of seven water heaters 141 to 147. In this case, the plurality of feed water heaters (141-147) are each of the four feed water heaters (141-144) disposed at the front end of the deaerator (148) via the bleed pipe (149). The medium-pressure turbine 112 may be connected to the low-pressure turbines 113a and 113b, and the three feedwater heaters 145-147 disposed at the rear end based on the deaerator 148 are provided with the intermediate pressure turbine 112 And it may be connected to the high pressure turbine 111, one of the three feed water heaters (145-147) disposed at the rear end based on the deaerator 148, one feed water heater 145 is the medium pressure turbine 112 It may be connected through the and the chute pipe 149 as a medium, and the other two water heaters 146 and 147 may be connected through the high pressure turbine 111 and the chute pipe 149 as a medium.

At least one feed water pump unit (151, 152) for supplying high-pressure feed water to the boiler 160 is installed between any two feed water heaters (144-147) among the plurality of feed water heaters (141-147). Can be. For example, the water supply pump units 151 and 152 may include a water supply pump 151 and a water supply boosting pump 152. In this case, the feed water pump 151 and the feed water boost pump 152 may be connected to the rear end of the deaerator 148, but limiting the positions of the feed water pump 151 and the feed feed boost pump 152 to this In addition, the plurality of water heaters (141-147) may be disposed at an appropriate position, and the plurality of water heaters (141-147) may also be used in an appropriate number.

Accordingly, the plurality of water and water heated by the plurality of water supply heaters 141-147 using the steam extracted from the turbine unit 110 will be supplied to the boiler 160 through the water supply pump units 151 and 152. The water supplied to the boiler 160 may be converted into high-temperature and high-pressure main steam by using heat energy obtained through combustion of fuel.

However, it is not limited to a plurality of water heaters (141-147) that can be applied to the power generation system (100, 200, 300) for improving efficiency and reducing heat consumption according to the present invention as a surface water heater, and from the turbine unit 110 A mixed feed water heater may be applied in which the extracted steam heats the feed water that has passed through the heat transfer surface through heat exchange.

The reheater 170 may increase the temperature by heating the low-temperature steam discharged from the high-pressure turbine 111 and supply it to the medium-pressure turbine 112.

As described above, the power generation system (100, 200, 300) for improving efficiency and reducing heat consumption according to an embodiment of the present invention uses a regeneration cycle using the bleed steam of the turbine unit 110 and the steam discharged from the high-pressure turbine 111. Thermal efficiency can be improved by configuring a modified Rankine cycle including a reheat cycle that is heated by the reheater 170 and supplied to the medium pressure turbine 112.

At this time, when the power generation system (100, 200, 300) for improving efficiency and reducing heat consumption according to an embodiment of the present invention is composed of a modified Rankine cycle including a regeneration cycle and a reheat cycle, some devices for configuring the regeneration and reheat cycle It is possible to improve the thermal efficiency of the entire cycle and reduce the heat consumption rate by improving the arrangement of

To this end, the power generation system (100, 200, 300) for improving efficiency and reducing heat consumption according to an embodiment of the present invention includes the pressure and temperature of the main steam supplied from the boiler 160 to the turbine unit 110 and the reheater. A heat consumption rate reduction unit 180, 280, 380 for increasing at least one of the temperatures of the reheat steam supplied from the 170 to the turbine unit 110 may be further included.

As an example, the power generation system (100, 200, 300) for improving efficiency and reducing heat consumption according to an embodiment of the present invention further includes at least one of a medium pressure turbine, a water heater, and a reheater constituting a regeneration and reheat cycle. I can.

Through this, the power generation system (100, 200, 300) for improving efficiency and reducing heat consumption according to an embodiment of the present invention is a high-temperature, high-pressure main steam moving to the high-pressure turbine 111 through the outlet of the boiler 160 The temperature may be 700° C. or higher and the pressure may be 350 kg/cm ^{2 or} higher.

For this reason, the power generation system (100, 200, 300) for efficiency improvement and heat consumption reduction according to an embodiment of the present invention improves the existing facility type constituting a large-capacity class (500 MWe class or higher) thermal power plant while improving the steam condition A- By raising it to the same level as the USC Plant Type, it is possible to improve the thermal efficiency of the entire cycle and reduce the heat consumption rate.

As an example, the power generation system 100 for improving efficiency and reducing heat consumption according to an embodiment of the present invention includes the boiler 160 and the plurality of feedwater heaters 141-147, as shown in FIG. An additional water heater 181 serving as the heat consumption reduction unit 180 may be disposed at the rear end of the nearest feed water heater 147, that is, at the front end of the boiler 160.

Such an additional water heater 181 may be connected through the high pressure turbine 111 and an additional thrust pipe 184 among the turbine unit 110, and the high pressure turbine 111 and the additional water heater 181 The extraction position of the additional extraction pipe 184 connecting) may be an inlet side of the high-pressure turbine 111.

Through this, some of the high-temperature and high-pressure main steam supplied from the boiler 160 to the high-pressure turbine 111 does not expand in the high-pressure turbine 111, and the additional water supply directly through the additional extraction pipe 184 It can move toward the heater 181.

Accordingly, the water supply passing through the additional extraction pipe 184 can be heated through the high-temperature and high-pressure steam supplied from the high-pressure turbine 111, and thus the boiler 160 is heated to a higher temperature than the conventional one. ) Can be supplied.

For this reason, the power generation system 100 for improving efficiency and reducing heat consumption according to an embodiment of the present invention increases the temperature and pressure of the feed water supplied to the boiler 160, so that the combustion supplied to the boiler 160 It is possible to reduce fuel consumption or to be supplied to the high-pressure turbine 111 in a state where the temperature and pressure of the main steam discharged from the boiler 160 is increased, thereby improving the thermal efficiency of the entire cycle and reducing the heat consumption rate. I can.

As another example, in the power generation system 200 for improving efficiency and reducing heat consumption according to an embodiment of the present invention, as shown in FIG. 3, the medium-pressure turbine 112 includes a first medium-voltage turbine 112 and a second medium-voltage turbine. A medium pressure turbine 182 may be included, and the first medium pressure turbine 112 may be a conventional medium pressure turbine receiving reheated steam from the reheater 170.

In this case, the heat consumption rate reduction unit 280 is an additional reheater 183 for reheating the steam discharged from the first medium pressure turbine 112 and the reheated steam reheated in the additional reheater 183 is introduced. It may include a second medium pressure turbine 182.

Here, the steam supplied to the second medium pressure turbine 182 through the additional reheater 183 expands in the second medium pressure turbine 182 and decreases in temperature and pressure, and then the low pressure turbines 113a and 113b Can be supplied as In addition, the temperature of the reheat steam supplied to the second medium pressure turbine 182 through the additional reheater 183 may be 730°C or higher.

Through this, in the present embodiment, the steam discharged from the first medium pressure turbine 112 is not directly supplied to the low pressure turbines 113a and 113b, but is reheated in the additional reheater 183 through the bypass path, and then the second medium pressure The turbine 182 can generate additional power.

Accordingly, the steam introduced into the second medium pressure turbine 182 is higher than the steam supplied directly from the medium pressure turbine 112 to the low pressure turbines 113a and 113b in a relatively high temperature and high pressure state, and the second medium pressure turbine 182 ), the heat efficiency of the entire cycle can be improved and the heat consumption rate can be reduced.

As another example, the power generation system 300 for improving efficiency and reducing heat consumption according to an embodiment of the present invention may be a combination of the embodiments of FIGS. 2 and 3 described above as shown in FIG. 4. .

Specifically, the heat consumption rate reduction unit 380 may include an additional water heater 181, a second medium pressure turbine 182, and an additional reheater 183.

To this end, the additional feed water heater 181 is at the rear end of the feed water heater 147 closest to the boiler 160 among the plurality of feed water heaters 141-147, that is, the front end side of the boiler 160. Can be placed. In addition, the medium pressure turbine 112 may include a first medium pressure turbine 112 and a second medium pressure turbine 182, and the first medium pressure turbine 112 receives steam reheated from the reheater 170. It may be an existing medium pressure turbine that is supplied.

In this case, the heat consumption rate reduction unit 380 includes an additional water heater 181 connected through an additional extraction pipe 184 at the inlet side of the high pressure turbine 111, and the first medium pressure It may be an additional reheater 183 for reheating steam discharged from the turbine 112 and a second medium-pressure turbine 182 for reheating steam reheated in the additional reheater 183 to be introduced.

Through this, some of the high-temperature and high-pressure main steam supplied from the boiler 160 to the high-pressure turbine 111 is added directly through the additional extraction pipe 184 at the initial part of the expansion in the high-pressure turbine 111 It can be moved to the water heater (181) side.

In addition, the steam discharged from the first medium pressure turbine 112 does not immediately move to the low pressure turbines 113a and 113b, but is reheated in the additional reheater 183 through the bypass path, and then in the second medium pressure turbine 182. Additional power can be produced, and then can be supplied to the low-pressure turbines 113a and 113b.

Accordingly, the water supply passing through the additional extraction pipe 184 can be heated through the bleed steam supplied from the high-pressure turbine 111 in a high-temperature, high-pressure state, so that the boiler ( 160) can be supplied.

In addition, the steam introduced into the second medium pressure turbine 182 is relatively higher than the steam supplied to the low pressure turbines 113a and 113b directly from the medium pressure turbine 112 in the second medium pressure turbine 182 Additional electricity can be produced through

Accordingly, the power generation system 300 for improving efficiency and reducing heat consumption according to an embodiment of the present invention increases the temperature and pressure of the feed water supplied to the boiler 160, so that the combustion supplied to the boiler 160 It is possible to save fuel or be supplied to the high-pressure turbine 111 in a state in which the temperature and pressure of the main steam discharged from the boiler 160 is higher, and through the additional reheater 183, the second Steam supplied to the medium-pressure turbine 182 can be supplied to the low-pressure turbines 113a and 113b after generating additional power while expanding in the second medium-pressure turbine 182, thereby improving the thermal efficiency of the entire cycle and The consumption rate can be reduced.

In this case, the high-temperature and high-pressure main steam moving to the high-pressure turbine 111 through the outlet of the boiler 160 may have a temperature of 700°C or higher and a pressure of 350kg/cm ² The temperature of the reheating steam supplied to the second medium pressure turbine 182 through the additional reheater 183 may be 730°C or higher.

For this reason, the power generation system 300 for improving efficiency and reducing heat consumption according to an embodiment of the present invention improves the existing facility type constituting a large-capacity class (500 MWe class or higher) thermal power plant while improving the steam condition A- By raising it to the same level as the USC Plant Type, it is possible to improve the thermal efficiency of the entire cycle and reduce the heat consumption rate.

This can be confirmed through Table 1 and FIG. 5 below.

The comparative example in Table 1 is an example for a large-capacity (800 MWe class) power plant, and is an output and heat consumption rate in a power generation system using a general regenerative reheat Rankine cycle that does not include the above-described heat consumption rate reduction unit (180,280,380), Is the output and heat consumption rate of the power generation system 100 for improving efficiency and reducing heat consumption according to an embodiment of the present invention in which an additional water heater 181 is included as the heat consumption rate reduction unit 180. 2 is an output of the power generation system 200 for improving efficiency and reducing heat consumption according to an embodiment of the present invention including a second medium pressure turbine 182 and an additional reheater 183 as the heat consumption rate reduction unit 280 And a heat consumption rate, and in Example 3, an additional water heater 181, a second medium pressure turbine 182, and an additional reheater 183 are included as the heat consumption rate reduction unit 380 according to an embodiment of the present invention. It is an output and heat consumption rate of the power generation system 300 for improving efficiency and reducing heat consumption rate.

In Comparative Examples and Examples 1 to 3, the condition of the main steam at the boiler outlet and the condition of the reheated steam at the reheater were set to the same level as the A-USC Plant Type.

Comparative example Example 1 Example 2 Example 3 Power Output
(MWe) 917.4 869.8 883.9 854.9 100% 94.81% 96.35% 93.19% Heat Rate(kcal/kwh) 1655 1644 1625 1618 100% 99.34% 98.19% 97.76%

As can be seen in Tables 1 and 5 above, when the condition of the main steam at the boiler outlet and the condition of the reheating steam at the reheater are A-USC Plant Type, Examples 1 to 3 are simply the main steam condition and reheating. When comparing the steam condition with the comparative example of the A-USC Plant Type, it can be seen that the heat consumption rate is further reduced by 0.66%, 1.81%, and 2.24%, respectively, while satisfying the output of 800 MWe or more.

That is, the power generation system (100, 200, 300) for improving efficiency and reducing heat consumption according to an embodiment of the present invention can obtain a result in which the heat consumption rate is reduced by 9 to 10% compared to the conventional method.

The heat consumption rate is defined as the amount of heat required to produce a unit of electricity, and the smaller this value is, the better the power generation system.

Therefore, the power generation system (100, 200, 300) for efficiency improvement and heat consumption reduction according to an embodiment of the present invention is supplied from the boiler 160 to the turbine unit 110 through the heat consumption rate reduction unit (180, 280, 380). It can be seen that the efficiency of the entire power generation system can be improved by increasing at least one of the pressure and temperature of the steam and the temperature of the reheated steam supplied from the reheater 170 to the turbine unit 110.

Through this, the power generation system (100, 200, 300) for improving efficiency and reducing heat consumption according to an embodiment of the present invention improves economic efficiency due to reduction of fuel cost and power generation cost, and reduces the amount of pollutants to clean the environment can do.

Although an embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiment presented in the present specification, and those skilled in the art who understand the spirit of the present invention can add components within the scope of the same idea. It will be possible to easily propose other embodiments by changing, deleting, adding, etc., but it will be said that this is also within the scope of the present invention.

100,200,300: Power generation system to improve efficiency and reduce heat consumption
110: turbine unit 111: high pressure turbine
112: medium pressure turbine 113a, 113b: low pressure turbine
120: condenser 122: circulating water system
124: shaft sealed steam recuperator 131: plural pump
132: multiple boosting pump 141~147: feed water heater
148: deaerator 149: pendulum
151: feed pump 152: feed boost pump
160: boiler 170: reheater
180,280,380: heat consumption reduction unit 181: additional water heater
182: second medium pressure turbine 183: additional reheater
184: additional thrust engine 190: generator

Claims (8)

delete As a next-generation supercritical (A-USC) power generation system, the steam temperature at the outlet of the boiler is 700℃ or higher, and the steam temperature at the outlet of the additional reheater is 730℃ or higher.
A turbine unit including a high-pressure turbine, a medium-pressure turbine and two low-pressure turbines and connected to a generator;
A plurality of pump units for condensing the steam discharged from the low-pressure turbine in a condenser and supplying the condensed condensate;
A plurality of feed water heaters for heating the feed water supplied from the plurality of pump units through steam extracted from the turbine unit;
A boiler for heating the feed water supplied from the feed water heater to generate high-temperature superheated steam and then supplying the superheated steam to the high-pressure turbine;
A reheater for reheating steam discharged from the high-pressure turbine and supplying it to the medium-pressure turbine; And
Including; a heat consumption rate reducing unit for increasing at least one of the pressure and temperature of the main steam supplied from the boiler to the turbine unit and the temperature of the reheat steam supplied from the reheater to the turbine unit;
The medium pressure turbine includes a first medium pressure turbine and a second medium pressure turbine, and the first medium pressure turbine is a medium pressure turbine receiving reheated steam from the reheater,
The heat consumption rate reduction unit,
Among the plurality of feed water heaters, a feed water heater closest to the boiler and an additional feed water heater disposed between the boiler, an additional reheater for reheating steam discharged from the first medium pressure turbine, and reheated in the additional reheater And the second medium pressure turbine into which reheat steam flows,
Some of the heated steam supplied to the high-pressure turbine is supplied from the inlet side of the high-pressure turbine to the additional water heater side, and the rest is supplied to the reheater side,
The additional water heater uses high-temperature and high-pressure steam extracted from the inlet side of the high-pressure turbine to heat the feed water supplied from the nearest feed water heater, and then supplies it to the boiler side, thereby improving efficiency and reducing heat consumption. system. delete delete delete delete The method of claim 2,
A power generation system for improving efficiency and reducing heat consumption of steam discharged from the second medium pressure turbine flowing into the low pressure turbine. The method of claim 2,
The plurality of water heaters is a mixed water heater including a deaerator, a power generation system for improving efficiency and reducing heat consumption.

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