JP6564646B2 - Steam turbine plant - Google Patents

Description

  The present invention relates to a steam turbine plant used in a nuclear power plant or a thermal power plant.

  For example, in a nuclear power plant, steam generated by a steam generator is sent to a steam turbine and a connected generator is driven to generate power. Generally, a steam turbine is composed of a high-pressure turbine and a low-pressure turbine, and the steam used in the high-pressure turbine is heated after the moisture is removed by a moisture separator heater and then sent to the low-pressure turbine. The steam used in the steam turbine is cooled by a condenser to become condensed water, and this condensed water is heated by a low-pressure feed water heater or a high-pressure feed water heater and then returned to the steam generator.

  In such a nuclear power plant, a steam turbine (high pressure turbine, low pressure turbine), a generator, a moisture separator heater, a low pressure feed water heater, and the like are arranged in one turbine building. Conventionally, a pair of moisture separation heaters are arranged on both sides of the steam turbine and the generator, and a pair of low-pressure feed water heaters are arranged on one moisture separation heater side. An example of such a steam turbine plant is described in Patent Document 1 below.

Japanese Patent No. 5135196

  The low-pressure feed water heater heats the condensate with steam by exchanging heat between the steam discharged from the high-pressure turbine and the condensate discharged from the condenser. Therefore, piping is connected from the high pressure turbine to the two moisture separation heaters, and piping is connected from the high pressure turbine to the two low pressure feed water heaters. However, since two low-pressure feed water heaters are arranged on one pair of high-pressure turbines, the pipe length from the high-pressure turbine to each low-pressure feed water heater becomes long, and the equipment cost increases. In addition, a plurality of pipes from the high-pressure turbine to each low-pressure feed water heater must be arranged avoiding various devices, and there is a problem that a pipe route becomes complicated.

  Conventionally, piping is connected from the high-pressure turbine to each moisture separation heater, and piping branched from one piping is connected to two low-pressure feed water heaters. Therefore, the amount of steam to the moisture separation heater where each low pressure feed water heater is arranged is less than the amount of steam to the moisture separation heater where no low pressure feed water heater is arranged. There is a problem in that the amount of steam supplied to the vessel is unbalanced and heat exchange efficiency is not good.

  The present invention solves the above-described problems, and an object of the present invention is to provide a steam turbine plant that improves the performance by simplifying the structure and reducing the cost and improving the heat exchange efficiency.

  In order to achieve the above object, a steam turbine plant of the present invention includes a high and medium pressure turbine in which a high pressure turbine section is provided at one end in the axial direction and an intermediate pressure turbine section is provided at the other end, and the high and medium pressure turbine. And a pair of moisture separators disposed on both sides of the high and medium pressure turbine to remove moisture from the steam from the high and medium pressure turbine and send the moisture to the low pressure turbine, And a pair of feed water heaters disposed on both sides of the pressure turbine to heat the feed water with steam from the high and medium pressure turbine.

  Therefore, by arranging the pair of feed water heaters on both sides of the high and medium pressure turbine together with the pair of moisture separators, the pipe length from the high and medium pressure turbine to each feed water heater can be shortened, and the equipment cost can be reduced. In addition, the piping route can be simplified and the structure can be simplified. In addition, the amount of steam supplied to each moisture separator can be made uniform, improving the heat exchange efficiency and improving the performance.

  In the steam turbine plant of the present invention, a pair of steam pipes for sending the steam exhausted from the intermediate pressure turbine section to the pair of moisture separators, and the steam branched from the pair of steam pipes to heat the pair of feed water And a pair of steam branch pipes to be sent to the vessel.

  Therefore, the steam exhausted from the intermediate pressure turbine section can be sent from the pair of steam pipes to each moisture separator, and the steam is sent from the pair of steam branch pipes branched from each steam pipe to each feed water heater. In addition to simplifying the various pipes, the amount of steam supplied to each moisture separator can be easily equalized.

  In the steam turbine plant of the present invention, the pair of feed water heaters are arranged along a longitudinal direction of the pair of moisture separators.

  Therefore, by disposing the feed water heater along the longitudinal direction of the moisture separator, the feed water heater and the moisture separator can be efficiently disposed, and effective use of the dead space can be achieved.

  The steam turbine plant of the present invention is characterized in that the high / medium pressure turbine, the pair of moisture separators, and the pair of feed water heaters are arranged in parallel.

  Therefore, by arranging the high and medium pressure turbine, the moisture separator, and the feed water heater in parallel, the feed water heater and the moisture separator can be efficiently arranged with respect to the high and medium pressure turbine, and the space is effectively used. Can be achieved.

  In the steam turbine plant of the present invention, the pair of feed water heaters and the pair of moisture separators are arranged at positions that do not overlap in the width direction.

  Therefore, by arranging the feed water heater and the moisture separator so as not to overlap in the width direction, there are no obstacles between the high and medium pressure turbine and the feed water heater and between the high and medium pressure turbine and the moisture separator. The piping can be easily connected from the high / medium pressure turbine to the feed water heater or the moisture separator, and the equipment cost can be reduced.

  The steam turbine plant of the present invention is characterized in that the pair of feed water heaters are disposed closer to the high and intermediate pressure turbine than the pair of moisture separators.

  Therefore, by arranging the feed water heater closer to the high and medium pressure turbine than the moisture separator, the piping from the high and medium pressure turbine to the feed water heater can be easily connected, and the equipment cost can be reduced.

  In the steam turbine plant of the present invention, the deaerator for removing impurities from the feed water from the pair of feed water heaters on one side in the axial direction of the high and medium pressure turbine and adjacent to the pair of feed water heaters is provided. It arrange | positions along the direction which cross | intersects the axial center direction in a high and medium pressure turbine.

  Therefore, by arranging the deaerator adjacent to the feed water heater on one side in the axial direction of the high and medium pressure turbine, the pipe length connecting the feed water heater and the deaerator can be shortened, and the space Can be used effectively.

  According to the steam turbine plant of the present invention, since the pair of moisture separators and the pair of feed water heaters are arranged on both sides of the high and intermediate pressure turbine, the structure is simplified and the cost is reduced, and the heat exchange efficiency is improved. Performance can be improved.

FIG. 1 is a schematic configuration diagram illustrating a nuclear power plant according to the present embodiment. FIG. 2 is a schematic diagram showing the flow of condensate and steam in the steam turbine plant of the present embodiment. FIG. 3 is a plan view showing the arrangement of the steam turbine plant of the present embodiment.

  Exemplary embodiments of a steam turbine plant of the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment, and when there are two or more embodiments, what comprises combining each embodiment is also included.

  FIG. 1 is a schematic configuration diagram illustrating a nuclear power plant according to the present embodiment.

  The nuclear reactor of the present embodiment uses light water as a reactor coolant and a neutron moderator, and produces high-temperature and high-pressure water that does not boil over the entire core, and sends this high-temperature and high-pressure water to a steam generator to generate steam by heat exchange. This is a pressurized water reactor (PWR) that generates electricity by sending this steam to a turbine generator.

  In a nuclear power plant having a pressurized water reactor according to the present embodiment, as shown in FIG. 1, a reactor containment vessel 11 stores therein a pressurized water reactor 12 and a steam generator 13. The nuclear reactor 12 and the steam generator 13 are connected via pipes 14 and 15, a pressurizer 16 is provided on the pipe 14, and a primary cooling water pump 17 is provided on the pipe 15. In this case, light water is used as a moderator and primary cooling water (cooling material), and the primary cooling system maintains a high pressure state of about 150 to 160 atm by the pressurizer 16 in order to suppress boiling of the primary cooling water in the core. You are in control. Therefore, in the pressurized water reactor 12, light water is heated as primary cooling water by low-enriched uranium or MOX as fuel (nuclear fuel), and the hot primary cooling water is maintained at a predetermined high pressure by the pressurizer 16. 14 to the steam generator 13. In the steam generator 13, heat exchange is performed between the high-temperature and high-pressure primary cooling water and the secondary cooling water, and the cooled primary cooling water is returned to the pressurized water reactor 12 through the pipe 15.

  The steam generator 13 is connected to a steam turbine 19 through a pipe 18, and a main steam isolation valve 20 is provided in the pipe 18. The steam turbine 19 has a high and medium pressure turbine 21 and two low pressure turbines 22 and 23, and a generator 24 is connected on the same axis. The high and intermediate pressure turbine 21 includes a high pressure turbine section 25 and an intermediate pressure turbine section 26, and the high pressure turbine section 25 and the intermediate pressure turbine section 26 are provided with a high pressure moisture separation heater 27 therebetween. Further, the high and medium pressure turbine 21 (medium pressure turbine section 26) and the low pressure turbines 22 and 23 are provided with a low pressure moisture separation heater 28 therebetween. That is, the pipe 18 from the steam generator 13 is connected to the inlet part of the high-pressure turbine part 25, and the steam pipe 29 is connected from the outlet part of the high-pressure turbine part 25 to the inlet part of the high-pressure moisture separator / heater 27. A steam pipe 30 is connected from the outlet of the moisture separator / heater 27 to the inlet of the intermediate pressure turbine section 26. A steam pipe 31 is connected from the outlet of the intermediate pressure turbine section 26 to the inlet of the low-pressure moisture separator / heater 28, and from the outlet of the low-pressure moisture separator / heater 28 to the inlets of the low-pressure turbines 22 and 23. A steam pipe 32 is connected.

  The steam turbine 19 is provided with condensers 33 and 34 below the low-pressure turbines 22 and 23. These condensers 33 and 34 cool the steam used in the low-pressure turbines 22 and 23 with cooling water and condense it to form condensate. Seawater is applied as the cooling water, and the condensers 33 and 34 are connected to a water intake pipe 35 and a drain pipe 36 for supplying and discharging the cooling water. The intake pipe 35 has a circulating water pump 37 and the other end portion is disposed in the sea together with the drain pipe 36.

  The condensers 33 and 34 are connected to a pipe 38, and a condensate pump 39, a ground condenser 40, a condensate demineralizer 41, a condensate booster pump 42, and a low-pressure feed water heater 43 are connected to the pipe 38. , 44, 45, 46 are provided in order along the flow direction of the condensate. Here, the first low-pressure feed water heater 43 and the second low-pressure feed water heater 44 are provided in the condensers 33 and 34, and the condensate is heated by the steam used in the low-pressure turbines 22 and 23. Further, the third low-pressure feed water heater 45 and the fourth low-pressure feed water heater 46 are provided outside the condensers 33 and 34, and the condensate is extracted from the low-pressure turbines 22 and 23 in the third low-pressure feed water heater 45. In the fourth low-pressure feed water heater 46, the condensate is heated by the steam exhausted from the intermediate pressure turbine section 26.

  In the pipe 38, a deaerator 47, a main feed water pump 48, a high pressure feed water heater 49, and a main feed water control valve 50 are provided in order along the flow direction of the condensate downstream from the fourth low pressure feed water heater 46. ing.

  Therefore, the steam generated by performing heat exchange with the high-temperature and high-pressure primary cooling water by the steam generator 13 is sent to the steam turbine 19 through the pipe 18 so that the high and medium pressure turbine 21 and the low-pressure turbines 22 and 23 are operated. Thus, a rotational force is obtained, and the generator 24 is driven by this rotational force to generate electric power. At this time, after the steam from the steam generator 13 drives the high-pressure turbine section 25, moisture contained in the steam is removed and heated by the high-pressure moisture separation heater 27, and then the medium-pressure turbine section 26 is heated. To drive. Further, the steam that has driven the intermediate pressure turbine section 26 is driven by the low-pressure moisture separator 28 after the moisture contained in the steam is removed and heated. The steam that has driven the low-pressure turbines 22 and 23 is cooled using seawater in the condensers 33 and 34 to become condensate, flows through the pipe 38 by the condensate pump 39, and is connected to the ground condenser 40 and the condensate demineralizer. 41, the low pressure feed water heaters 43, 44, 45, 46, the deaerator 47, the high pressure feed water heater 49 and the like are returned to the steam generator 13.

  Here, the flow of condensate and steam in the high and medium pressure turbine 21, the low pressure turbines 22, 23, the high pressure moisture separation heater 27, the low pressure moisture separation heater 28, and the low pressure feed water heaters 43, 44, 45, 46 will be described. To do. FIG. 2 is a schematic diagram showing the flow of condensate and steam in the steam turbine plant of the present embodiment.

  As shown in FIG. 2, the steam pipe 31 from the outlet of the intermediate pressure turbine section 26 to the inlet of the low-pressure moisture separator / heater 28 is connected to the base end of the steam branch pipe 51 branched from the middle section. The tip of the steam branch pipe 51 is connected to the fourth low-pressure feed water heater 46. Further, the distal end portion of the extraction pipe 52 from the low pressure turbines 22 and 23 is connected to the third low pressure feed water heater 45. Therefore, the third low-pressure feed water heater 45 heats the condensate with the steam extracted from the low-pressure turbines 22 and 23, and the fourth low-pressure feed water heater 46 condensates with the steam exhausted from the intermediate-pressure turbine section 26. Heat.

  In addition, each of the low-pressure feed water heaters 43, 44, 45, and 46 generates drain (water) because the steam condenses by heating the condensate. Therefore, a drain pipe 53 is connected from the fourth low-pressure feed water heater 46 to the third low-pressure feed water heater 45, a drain pipe 54 is connected from the third low-pressure feed water heater 45 to the second low-pressure feed water heater 44, and the second A drain pipe 55 is connected from the low pressure feed water heater 44 to the first low pressure feed water heater 43. A drain pipe 56 is connected between the first low-pressure feed water heater 43 and the first low-pressure feed water heater 43 and the second low-pressure feed water heater 44 in the pipe 38, and a drain pump 57 is provided in the drain pipe 56. Yes.

  In the steam turbine plant of the present embodiment configured as described above, the high-pressure moisture separation heater 27, the low-pressure moisture separation heater 28, the third low-pressure feed water heater 45, and the fourth low-pressure feed water are provided for the steam turbine 19. The heater 46 etc. are arranged efficiently.

  FIG. 3 is a plan view showing the arrangement of the steam turbine plant of the present embodiment.

  As shown in FIG. 3, the steam turbine plant of the present embodiment includes a high and medium pressure turbine 21, low pressure turbines 22 and 23, a generator 24, a high pressure moisture separation heater 27, and a low pressure moisture separation heater 28. And low-pressure feed water heaters 43, 44, 45, 46.

  The turbine building (not shown) is composed of a plurality of floors, and a foundation 62 is laid at the center of a floor 61 on a predetermined floor. On the foundation 62, a high / medium-pressure turbine 21 and two low-pressure turbines 22 are provided. , 23 and the generator 24 are coaxially installed along the axial direction C.

  The low-pressure moisture separator / heater 28 includes two low-pressure moisture separators / heaters 28a and 28b, and is placed on the floor 61 so as to be positioned on both sides in the width direction (vertical direction in FIG. 3) of the high / medium-pressure turbine 21. Has been placed. The low-pressure moisture separation heaters 28a and 28b are arranged in parallel to the axial direction C with a predetermined distance from the high / medium-pressure turbine 21 and the low-pressure turbines 22 and 23. Each of the low pressure moisture separators 28a and 28b removes moisture from the steam exhausted from the high and medium pressure turbine 21 and sends it to the low pressure turbines 22 and 23. The intermediate pressure turbine section 26 (see FIG. 2) Two steam pipes 31a and 31b are extended from the outlet part, and the tip part is connected to each inlet part of each low-pressure moisture separation heater 28a and 28b. The low-pressure moisture separation heaters 28a and 28b are connected with steam pipes 32a and 32b from the outlet portion to the inlet portions of the low-pressure turbines 22 and 23, respectively. Each low-pressure moisture separator / heater 28a, 28b is provided with a heat transfer tube group as a heating source for heating the steam, and the steam from the steam generator 13 circulates.

  The fourth low-pressure feed water heater 46 is composed of two fourth low-pressure feed water heaters 46a and 46b, and is placed on the floor 61 so as to be located on both sides in the width direction (vertical direction in FIG. 3) of the high and medium pressure turbine 21. Has been placed. The fourth low-pressure feed water heaters 46 a and 46 b are arranged in parallel to the axial direction C with a predetermined distance from the high / medium-pressure turbine 21 and the low-pressure turbines 22 and 23. Each of the fourth low-pressure feed water heaters 46a and 46b heats the condensate (feed water) with steam exhausted from the high / medium-pressure turbine 21, and steam branch pipes 51a branched from the two steam pipes 31a and 31b, respectively. , 51b are provided, and the tip ends are connected to the respective inlet portions of the fourth low-pressure feed water heaters 46a, 46b. The fourth low-pressure feed water heaters 46a and 46b can supply condensate heated by steam from the intermediate pressure turbine section 26, and supply water pipes 63a and 63b and drain pipes 64a and 64b functioning as the pipe 38. Is connected.

  Moreover, each 4th low voltage | pressure feed water heater 46a, 46b is arrange | positioned in parallel along the longitudinal direction in each low pressure moisture separation heater 28a, 28b. And each 4th low pressure feed water heater 46a, 46b and each low pressure moisture separation heater 28a, 28b are arrange | positioned in the position which does not overlap in the width direction (up-down direction of FIG. 3). Moreover, each 4th low pressure feed water heater 46a, 46b is arrange | positioned closer to the high intermediate pressure turbine 21 side rather than each low pressure moisture separation heater 28a, 28b.

  The deaerator 47 is located on one side in the axial direction C of the high and medium pressure turbine 21 and on the floor 61 adjacent to the longitudinal direction of each of the fourth low pressure feed water heaters 46a and 46b. It is arranged along the direction intersecting the direction C. The deaerator 47 removes impurities such as dissolved oxygen and non-condensed gas (ammonia gas) from the condensed water (feed water) from the fourth low-pressure feed water heaters 46a and 46b. The tip ends of the drain pipes 64a and 64b from the vessels 46a and 46b are connected.

  Therefore, as shown in FIGS. 2 and 3, the steam sent from the steam generator 13 through the pipe 18 drives the high-pressure turbine section 25 of the high and medium-pressure turbine 21, and then the high-pressure moisture separation heating by the steam pipe 29. It is sent to a vessel 27 where moisture is removed and heated. The steam processed by the high-pressure moisture separation heater 27 is driven to the intermediate-pressure turbine section 26 and then sent to the low-pressure moisture separation heater 28 through the steam pipe 30 where the moisture is removed and heated. The The steam processed by the low-pressure moisture separator / heater 28 is sent to the low-pressure turbines 22 and 23 through the steam pipe 31 and driven.

  At this time, the steam exhausted from the intermediate pressure turbine section 26 is sent to the low-pressure moisture separation heaters 28a and 28b on both sides of the intermediate pressure turbine section 26 through a pair of steam pipes 31a and 31b, and a pair of steam. It is sent to each 4th low pressure feed water heater 46a, 46b in the both sides of the intermediate pressure turbine part 26 by branch piping 51a, 51b. Then, the steam exhausted from the intermediate pressure turbine section 26 is equally branched into the steam pipes 31a and 31b and flows to the low-pressure moisture separation heaters 28a and 28b, and is equally supplied to the steam branch pipes 51a and 51b. It branches and flows into each 4th low voltage | pressure feed water heater 46a, 46b. Therefore, the same amount of steam is sent to the left and right low-pressure moisture separators 28a, 28b, and the same amount of steam is also sent to the left and right fourth low-pressure feed water heaters 46a, 46b. As a result, the left and right low-pressure moisture separation heaters 28a and 28b and the left and right fourth low-pressure feed water heaters 46a and 46b each process the steam uniformly, improving the performance by eliminating the imbalance of the steam amount. To do.

  Thus, in the steam turbine plant of the present embodiment, the high and medium pressure turbine 21 in which the high pressure turbine section 25 is provided at one end in the axial direction C and the intermediate pressure turbine section 26 is provided at the other end, A pair of low-pressure turbines 22 and 23 arranged coaxially with the pressure turbine 21 and a pair of high- and medium-pressure turbines 21 disposed on both sides to remove moisture from the steam from the high and medium-pressure turbine 21 and send them to the low-pressure turbines 22 and 23 A low-pressure moisture separator / heater 28 (28a, 28b) and a pair of fourth low-pressure feed water heaters 46 (which are disposed on both sides of the high / intermediate pressure turbine 21 and heat condensate (feed water) by steam from the high / intermediate pressure turbine 21) 46a, 46b).

  Accordingly, the pair of fourth low-pressure feed water heaters 46a, 46b are disposed on both sides of the high / medium-pressure turbine 21 together with the pair of low-pressure moisture separation heaters 28a, 28b, so The piping length to the vessels 46a and 46b can be shortened, the equipment cost can be reduced, the piping route can be simplified, and the structure can be simplified. In addition, the amount of steam supplied to each low-pressure moisture separator / heater 28a, 28b can be made uniform, and the performance can be improved by improving the heat exchange efficiency.

  In the steam turbine plant of the present embodiment, the steam exhausted from the intermediate pressure turbine section 26 is branched from a pair of steam pipes 31a and 31b and a pair of steam pipes 31a and 31b that send the steam to the low-pressure moisture separation heaters 28a and 28b. And a pair of steam branch pipes 51a and 51b for sending steam to the fourth low-pressure feed water heaters 46a and 46b. Accordingly, the steam exhausted from the intermediate pressure turbine section 26 can be sent from the steam pipes 31a and 31b to the low-pressure moisture separation heaters 28a and 28b, and a pair of steam branch pipes branched from the steam pipes 31a and 31b. Steam can be sent from each of the 51a and 51b to the fourth low-pressure feed water heaters 46a and 46b, so that various pipes can be simplified, and the low-pressure moisture separation heaters 28a and 28b are easily supplied. The amount of steam can be made uniform.

  In the steam turbine plant of the present embodiment, the pair of fourth low-pressure feed water heaters 46a and 46b are arranged along the longitudinal direction of the low-pressure moisture separation heaters 28a and 28b. Therefore, the fourth low-pressure feed water heaters 46a and 46b and the low-pressure moisture separation heaters 28a and 28b can be efficiently arranged, and the dead space can be effectively used.

  In the steam turbine plant of the present embodiment, the high and medium pressure turbine 21, the low-pressure moisture separation heaters 28a and 28b, and the fourth low-pressure feed water heaters 46a and 46b are arranged in parallel. Therefore, the fourth low-pressure feed water heaters 46a, 46b and the low-pressure moisture separation heaters 28a, 28b can be efficiently arranged with respect to the high / medium-pressure turbine 21, and the space can be effectively used.

  In the steam turbine plant of the present embodiment, the fourth low-pressure feed water heaters 46a, 46b and the low-pressure moisture separation heaters 28a, 28b are arranged at positions that do not overlap in the width direction. Accordingly, a sufficient space for obstacles can be secured between the high and medium pressure turbine 21 and the fourth low pressure feed water heaters 46a and 46b, and between the high and medium pressure turbine 21 and the low pressure moisture separation heaters 28a and 28b. Various pipes can be easily arranged from the high / medium pressure turbine 21 to the fourth low-pressure feed water heaters 46a, 46b and the low-pressure moisture separation heaters 28a, 28b, and the equipment cost can be reduced.

  In the steam turbine plant of the present embodiment, the fourth low-pressure feed water heaters 46a and 46b are disposed closer to the high and intermediate-pressure turbine 21 than the low-pressure moisture separation heaters 28a and 28b. Therefore, it is possible to easily arrange the steam branch pipes 51a and 51b from the steam pipes 31a and 31b connecting the high and medium pressure turbine 21 and the low-pressure moisture separation heaters 28a and 28b to the fourth low-pressure feed water heaters 46a and 46b. This can reduce the equipment cost.

  In the steam turbine plant of the present embodiment, the deaerator 47 is disposed on one side in the axial direction C of the high and intermediate pressure turbine 21 and adjacent to the fourth low pressure feed water heaters 46a and 46b. It is arranged along the direction that intersects. Therefore, the fourth low-pressure feed water heaters 46a and 46b and the deaerator 47 can be easily connected, the length of the pipe can be shortened, and the space can be effectively used.

  In the above-described embodiment, four low-pressure feed water heaters 43, 44, 45, and 46 are provided, and the two low-pressure feed water heaters 43 and 44 are arranged in the condensers 33 and 34. Although the low-pressure feed water heaters 45 and 46 are arranged outside the condensers 33 and 34, the arrangement and number of the low-pressure feed water heaters 45 and 46 are not limited to those in the embodiment, and may be set as appropriate according to the scale of the steam turbine plant. Is.

  In the above-described embodiment, the steam exhausted from the final stage of the intermediate pressure turbine section 26 is supplied to the low pressure moisture separation heater 28 (28a, 28b), but is extracted from the intermediate stage of the intermediate pressure turbine section 26. Steam may be supplied to the low-pressure moisture separator 28 (28a, 28b).

  Moreover, although the steam turbine plant of this invention was applied and demonstrated to the nuclear power plant in embodiment mentioned above, it is not limited to this, For example, it can also apply to a thermal power plant etc.

12 Pressurized Water Reactor 13 Steam Generator 18, 38 Piping 19 Steam Turbine 21 High Medium Pressure Turbine 22, 23 Low Pressure Turbine 24 Generator 25 High Pressure Turbine Part 26 Medium Pressure Turbine Part 27 High Pressure Moisture Separation Heater (Moisture Separator)
28, 28a, 28b Low pressure moisture separator / heater (moisture separator)
29, 30, 31, 31a, 31b, 32, 32a, 32b Steam piping 33, 34 Condenser 43 First low-pressure feed water heater 44 Second low-pressure feed water heater 45 Third low-pressure feed water heater 46, 46a, 46b First 4 Low pressure water heater 51, 51a, 51b Steam branch pipe 52 Extraction pipe 61 Floor 62 Foundation 63a, 63b Water supply pipe 64a, 64b Drain pipe C Axial direction

Claims (6)

A high and medium pressure turbine in which a high pressure turbine portion is provided at one end in the axial direction and an intermediate pressure turbine portion is provided at the other end;
A low pressure turbine disposed coaxially with the high to medium pressure turbine;
A pair of moisture separators disposed on opposite sides of the high and medium pressure turbine to remove moisture from steam from the high and medium pressure turbine and send it to the low pressure turbine;
A pair of feed water heaters disposed on both sides of the high and medium pressure turbine to heat feed water with steam from the high and medium pressure turbine;
I have a,
A deaerator that removes impurities from feed water from the pair of feed water heaters on one side in the axial direction of the high and medium pressure turbine and adjacent to the pair of feed water heaters extends in the axial direction of the high and medium pressure turbine. Arranged along the intersecting direction,
A steam turbine plant characterized by that.   A pair of steam pipes for sending steam exhausted from the intermediate pressure turbine section to the pair of moisture separators, and a pair of steam branch pipes branching from the pair of steam pipes and sending steam to the pair of feed water heaters The steam turbine plant according to claim 1, wherein   The steam turbine plant according to claim 1 or 2, wherein the pair of feed water heaters are arranged along a longitudinal direction of the pair of moisture separators.   The steam turbine plant according to any one of claims 1 to 3, wherein the high and intermediate pressure turbine, the pair of moisture separators, and the pair of feed water heaters are arranged in parallel. .   The steam turbine plant according to any one of claims 1 to 4, wherein the pair of feed water heaters and the pair of moisture separators are arranged at positions that do not overlap in the width direction. The steam turbine plant according to any one of claims 1 to 5, wherein the pair of feed water heaters are disposed closer to the high and intermediate pressure turbine than the pair of moisture separators.

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