JP2017040198A - Steam turbine plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steam turbine plant which simplifies a structure and reduces a facility cost.SOLUTION: A steam turbine plant comprises: a high and middle pressure turbine 21 with a high pressure turbine section 25 and a middle pressure turbine section 26 respectively installed at one edge section and the other edge section in an axial center direction thereof; low pressure turbines 22 and 23 which are arranged coaxially with the high and middle pressure turbine 21; a high pressure moisture separation heater 27 which is arranged at a position opposite to the low pressure turbines 22 and 23 in the axial center direction of the high and middle pressure turbine 21 and sends steam supplied from the high pressure turbine section 25 to the middle pressure turbine section 26 after removing moisture therefrom; and a low pressure moisture separation heater 28 which sends the steam supplied from the middle pressure turbine section 26 to the low pressure turbines 22 and 23 after removing the moisture therefrom.SELECTED DRAWING: Figure 1

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, steam turbines (high pressure turbine, medium pressure turbine, low pressure turbine), generators, high pressure moisture separation heater, low pressure moisture separation heater, etc. Are arranged in one turbine building. An example of such a steam turbine plant is described in Patent Document 1 below.

JP-A-62-218606

  In a conventional steam turbine plant, when trying to realize the system configuration disclosed in Patent Document 1, the high-pressure moisture separation heater and the low-pressure moisture separation heater are equipped with equipment and piping to suppress an increase in the flow rate of steam to be processed. Will become larger. For this reason, the high-pressure moisture separator / heater and the low-pressure moisture separator / heater are generally arranged at a position separated from the steam turbine or on a floor at a different level from the steam turbine. Then, while a turbine building will enlarge and an installation cost will increase, the subject that the maintainability of each moisture separation heater is not good occurs.

  The present invention solves the above-described problems, and an object thereof is to provide a steam turbine plant that simplifies the structure and reduces equipment costs.

  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 low pressure turbine disposed coaxially with the low pressure turbine in the axial direction of the high and medium pressure turbine, and removes moisture from steam from the high pressure turbine portion to the intermediate pressure turbine portion. A high-pressure moisture separator for sending, and a low-pressure moisture separator for removing moisture from the steam from the intermediate-pressure turbine and sending it to the low-pressure turbine.

  Therefore, by arranging the high-pressure moisture separator on the side opposite to the low-pressure turbine in the axial direction of the high-medium-pressure turbine, the high-pressure moisture separator can be arranged in the vicinity of the high-medium-pressure turbine and the low-pressure turbine. As a result, the structure can be simplified, the equipment cost can be reduced, and the turbine building can be downsized.

  In the steam turbine plant of the present invention, the high-pressure moisture separator is arranged along a direction intersecting the axial direction.

  Therefore, by arranging the high-pressure moisture separator in a direction intersecting with the high-medium-pressure turbine and the low-pressure turbine, the axial center space can be effectively used, and the turbine building can be downsized.

  In the steam turbine plant of the present invention, a deaerator is arranged on the opposite side of the low-pressure turbine in the axial direction of the high-medium pressure turbine, and the high-pressure moisture separator includes the high-medium-pressure turbine and the deaerator. It is characterized by being arranged between.

  Therefore, the high-pressure moisture separator is arranged between the high and medium-pressure turbine and the deaerator, and not only the high-pressure moisture separator but also the deaerator can be arranged efficiently.

  In the steam turbine plant of the present invention, the high-pressure moisture separator is arranged along the axial direction.

  Therefore, by arranging the high-pressure moisture separator in parallel with the high / medium-pressure turbine or the low-pressure turbine, the longitudinal direction of various devices can be aligned and the space can be effectively used.

  In the steam turbine plant of the present invention, the high-pressure moisture separator is arranged on the same floor as the high-medium pressure turbine, the low-pressure turbine, and the low-pressure moisture separator.

  Therefore, by arranging the high-pressure moisture separator on the same floor as the high-medium-pressure turbine, the low-pressure turbine, and the low-pressure moisture separator, the pipe length of the connection pipe can be shortened and the equipment cost can be reduced.

  In the steam turbine plant of the present invention, the high-pressure moisture separator is arranged on different floors above and below the high-medium pressure turbine and the low-pressure turbine.

  Therefore, by arranging the high-pressure moisture separator on different floors above and below the high-medium pressure turbine and the low-pressure turbine, it is possible to secure the pipe length of the connection pipe and reduce the adverse effects due to thermal stress.

  In the steam turbine plant of the present invention, a plurality of the high-pressure moisture separators are arranged in parallel.

  Therefore, by arranging a plurality of high-pressure moisture separators in parallel, steam from the high-pressure turbine section can be processed in a balanced manner.

  In the steam turbine plant of the present invention, the high-pressure moisture separator is the high-pressure moisture separator / heater.

  Therefore, the steam can be heated appropriately.

  According to the steam turbine plant of the present invention, the high pressure moisture separator is disposed on the opposite side of the low pressure turbine in the axial direction of the high and medium pressure turbine, so that the structure can be simplified and the equipment cost can be reduced. Can do.

FIG. 1 is a schematic configuration diagram illustrating a nuclear power plant according to the first embodiment. FIG. 2 is a schematic diagram illustrating the flow of condensate and steam in the steam turbine plant of the first embodiment. FIG. 3 is a plan view showing the arrangement of the steam turbine plant of the first embodiment. FIG. 4 is a front view showing the arrangement of the steam turbine plant. FIG. 5 is a front view showing another arrangement of the steam turbine plant. FIG. 6 is a plan view showing the arrangement of the steam turbine plant of the second embodiment. FIG. 7 is a plan view showing the arrangement of the steam turbine plant of the third 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.

[First Embodiment]
FIG. 1 is a schematic configuration diagram illustrating a nuclear power plant according to the first embodiment.

  The nuclear reactor according to the first embodiment uses light water as a reactor coolant and a neutron moderator, and generates high-temperature and high-pressure water that does not boil over the entire core, and generates steam by heat exchange by sending this high-temperature and high-pressure water to a steam generator. And a pressurized water reactor (PWR) that generates power by sending the steam to a turbine generator.

  In the nuclear power plant having a pressurized water reactor according to the first embodiment, as shown in FIG. 1, the 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 in the pipe 14, and a primary cooling water pump 17 is provided in 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 electricity. 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 illustrating the flow of condensate and steam in the steam turbine plant of the first 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 first embodiment configured as described above, the high-pressure moisture separation heater 27, the low-pressure moisture separation heater 28, and the like are efficiently arranged with respect to the steam turbine 19.

  FIG. 3 is a plan view showing the arrangement of the steam turbine plant of the first embodiment, and FIG. 4 is a front view showing the arrangement of the steam turbine plant.

  As shown in FIGS. 3 and 4, the steam turbine plant of the first embodiment includes a high-medium pressure turbine 21, low-pressure turbines 22 and 23, a generator 24, a high-pressure moisture separation heater 27, and low-pressure moisture. And a separation heater 28.

  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. Is arranged. 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.

  Further, the high-pressure moisture separation heater 27 is composed of one piece, and is disposed on the opposite side of the high- and medium-pressure turbine 21 in the axial direction C from the low-pressure turbines 22 and 23. The high-pressure moisture separation heater 27 is disposed on the floor 61 along a direction that intersects the axial direction C adjacent to the high-medium-pressure turbine 21. The high-pressure moisture separation heater 27 removes moisture from the steam exhausted from the high-pressure turbine section 25 and sends it to the intermediate-pressure turbine section 26, and steam from the outlet of the high-pressure turbine section 25 (see FIG. 2). The pipe 29 is extended, and the tip is connected to the inlet of the high-pressure moisture separator / heater 27. The high-pressure moisture separation heater 27 is connected to the steam pipe 30 from the outlet portion to the inlet portion of the intermediate pressure turbine portion 26. Further, the high-pressure moisture separation heater 27 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 deaerator 47 is arranged on a floor 61 on one side in the axial center direction C of the high and intermediate pressure turbine 21 along a direction intersecting the axial center direction C of the high and intermediate pressure turbine 21. The deaerator 47 removes impurities such as dissolved oxygen and uncondensed gas (ammonia gas) from the condensate (feed water) from the fourth low-pressure feed water heater 46 (see FIG. 2). The high-pressure moisture separator / heater 27 is disposed between the high / intermediate pressure turbine 21 and the deaerator 47 at a predetermined interval from the high / intermediate pressure turbine 21 and the deaerator 47.

  In this case, the high and medium pressure turbine 21, the low pressure turbines 22, 23, the generator 24, the high pressure moisture separation heater 27, the low pressure moisture separation heater 28 (28a, 28b), and the deaerator 47 are placed on the same floor 61. Has been placed.

  In the above-described embodiment, the high-pressure moisture separation heater 27 is disposed on the same floor 61 as the high-medium pressure turbine 21 and the low-pressure turbines 22 and 23 between the high-medium pressure turbine 21 and the deaerator 47. However, the present invention is not limited to this configuration. FIG. 5 is a front view showing another arrangement of the steam turbine plant.

  As shown in FIG. 5, a floor 63 is provided below the floor 61. The high-pressure moisture separation heater 27 is arranged on a lower floor 63 different from the floor 61 on which the high / medium-pressure turbine 21 and the low-pressure turbines 22 and 23 are installed. However, the high-pressure moisture separation heater 27 is arranged along the direction intersecting the axial direction C on the opposite side to the low-pressure turbines 22 and 23 in the axial direction C of the high and medium-pressure turbine 21 as described above. Yes. The deaerator 47 is disposed on the floor 61 on one side in the axial center direction C of the high and medium pressure turbine 21 along a direction intersecting the axial center direction C of the high and intermediate pressure turbine 21. The high-pressure moisture separator / heater 27 is disposed on the floor 63 on one side in the axial center direction C of the high / intermediate pressure turbine 21 along a direction intersecting the axial center direction C of the high / intermediate pressure turbine 21. Therefore, the high-pressure moisture separation heater 27 is positioned below the deaerator 47.

  Therefore, in the turbine plant of the present embodiment, one high-pressure moisture separator / heater 27 is adjacent to the high / medium-pressure turbine 21 on the side opposite to the low-pressure turbines 22 and 23 in the axial direction C of the high / medium-pressure turbine 21. It is arranged on the floor 63 along the direction intersecting the axial direction C. Then, the high-pressure moisture separator / heater 27 can be efficiently disposed in the vicinity of the high / medium-pressure turbine 21, and the pipe lengths of the steam pipes 29 and 30 are shortened to simplify the structure. In addition, since one high-pressure moisture separator / heater 27 is provided, the maintainability is improved and the equipment cost is reduced.

  As shown in FIGS. 1 to 3, the steam sent from the steam generator 13 through the pipe 18 drives the high-pressure turbine section 25 of the high-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 32 and driven.

  At this time, the steam exhausted from the intermediate pressure turbine section 26 is sent to the low-pressure moisture separator / heater 28 through the steam pipe 31 (31a, 31b) and to the fourth low-pressure feed water heater 46 through the steam branch pipe 51. It is done. Further, the steam extracted from the low-pressure turbines 22 and 23 is sent to the third low-pressure feed water heater 45 through the extraction pipe 52. Therefore, the third low-pressure feed water heater 45 heats the condensate (feed water) flowing through the pipe 38 with the steam from the low-pressure turbines 22 and 23, and the fourth low-pressure feed water heater 46 is the steam from the intermediate-pressure turbine section 26. The condensate (feed water) heated by the third low-pressure feed water heater 45 and flowing through the pipe 38 is heated.

  Thus, in the steam turbine plant of the first 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, The low-pressure turbines 22 and 23 arranged coaxially with the high and medium-pressure turbine 21, and the moisture from the steam from the high-pressure turbine unit 25 arranged on the opposite side to the low-pressure turbines 22 and 23 in the axial direction C of the high and medium-pressure turbine 21 A high-pressure moisture separation heater 27 for removing the moisture and sending it to the intermediate-pressure turbine section 26, and a low-pressure moisture separation heater 28 for removing moisture from the steam from the intermediate-pressure turbine section 26 and sending it to the low-pressure turbines 22, 23; Is provided.

  Accordingly, the high-pressure moisture separation heater 27 can be disposed in the vicinity of the high-medium pressure turbine 21 and the low-pressure turbines 22, 23, and the steam pipes 29, 30 connecting the high-pressure moisture separation heater 27 and the high-medium pressure turbine 21 are provided. The pipe length is shortened, the structure can be simplified, the equipment cost can be reduced, and the turbine building can be downsized.

  In the steam turbine plant of the first embodiment, the high-pressure moisture separator / heater 27 is disposed along the direction intersecting the axial direction C. Therefore, the length in the axial center direction C of the high-medium pressure turbine 21 of various devices can be shortened, and the turbine building can be downsized by effectively using the space. In addition, a maintenance space can be secured at the end in the longitudinal direction of the high-pressure moisture separation heater 27, and the maintainability of the high-pressure moisture separation heater 27 can be improved.

  In the steam turbine plant of the first embodiment, a deaerator 47 is disposed on the opposite side of the high and medium pressure turbine 21 in the axial direction C from the low pressure turbines 22 and 23, and the high pressure moisture separation heater 27 is connected to the high and medium pressure turbine 21. It arrange | positions between the deaerators 47. Therefore, not only the high-pressure moisture separation heater 27 but also the deaerator 47 can be efficiently arranged in a limited space.

  In the steam turbine plant of the first embodiment, the high-pressure moisture separator / heater 47 is disposed on the same floor 61 as the high / medium-pressure turbine 21, the low-pressure turbines 22 and 23, and the low-pressure moisture separator / heater 28. Therefore, the pipe length of the steam pipes 29, 30, and 31 can be shortened to reduce the equipment cost.

  In the steam turbine plant of the first embodiment, the high-pressure moisture separation heater 27 is disposed on a floor 63 that is different from the upper and lower sides of the high-medium-pressure turbine 21 and the low-pressure turbines 22 and 23. Accordingly, it is possible to secure a long pipe length for the steam pipes 29, 30, and 31 to reduce adverse effects due to thermal stress.

  In the present embodiment, the high-pressure moisture separation heater 27 is disposed along the direction intersecting the axial direction C on the opposite side of the low-pressure turbines 22 and 23 in the axial direction C of the high and medium-pressure turbine 21. What is necessary is just to set the position of the longitudinal direction of the high pressure moisture separation heater 27 suitably according to the surrounding apparatus. For example, it is reasonable to arrange the high-pressure moisture separation heater 27 at the center position in the width direction of the high-medium pressure turbine 21 (direction intersecting the axial direction C). You may offset and arrange | position to the one side of the width direction of the pressure turbine 21. FIG.

[Second Embodiment]
FIG. 6 is a plan view showing the arrangement of the steam turbine plant of the second embodiment. In addition, the same code | symbol is attached | subjected to the member which has the same function as embodiment mentioned above, and detailed description is abbreviate | omitted.

  As shown in FIG. 6, the steam turbine plant according to the second embodiment includes a high and medium pressure turbine 21, a low pressure turbine 22, a pipe 31, a high pressure moisture separation heater 27, and a low pressure moisture separation heater 28. Have.

  The low-pressure moisture separator / heater 28 includes two low-pressure moisture separators / heaters 28 a and 28 b and is disposed on the floor 61 so as to be located on both sides in the width direction of the high / medium-pressure turbine 21. The high-pressure moisture separation heater 27 is composed of two high-pressure moisture separation heaters 27 a and 27 b, and is disposed on the opposite side to the low-pressure turbine 22 in the axial direction C of the high-medium-pressure turbine 21. The high-pressure and moisture separation heaters 27 a and 27 b are disposed on the floor 61 along the direction crossing the axial direction C adjacent to the high and medium pressure turbine 21. The high-pressure moisture separation heaters 27a and 27b are installed in a plurality (two in this embodiment), and are arranged in parallel at a predetermined interval in parallel.

  Thus, in the steam turbine plant of the second embodiment, the high-pressure moisture separation heater 27 is arranged in parallel as two high-pressure moisture separation heaters 27a and 27b. Therefore, the steam from the high-pressure turbine unit 25 can be processed with a good balance.

[Third Embodiment]
FIG. 7 is a plan view showing the arrangement of the steam turbine plant of the third embodiment. In addition, the same code | symbol is attached | subjected to the member which has the same function as embodiment mentioned above, and detailed description is abbreviate | omitted.

  As shown in FIG. 7, the steam turbine plant of the third embodiment includes a high and medium pressure turbine 21, a low pressure turbine 22, a pipe 31, a high pressure moisture separation heater 27, and a low pressure moisture separation heater 28. Have.

  The low-pressure moisture separator / heater 28 includes two low-pressure moisture separators / heaters 28 a and 28 b and is disposed on the floor 61 so as to be located on both sides in the width direction of the high / medium-pressure turbine 21. Further, the high-pressure moisture separation heater 27 is composed of one piece, and is disposed on the opposite side of the high-medium pressure turbine 21 in the axial direction C from the low-pressure turbine 22. The high-pressure moisture separation heater 27 is disposed on the floor 61 along the axial direction C adjacent to the high-medium pressure turbine 21. In this case, the high-pressure moisture separator 27, the high / medium-pressure turbine 21, and the low-pressure turbine 22 are arranged in a straight line along the axial direction C.

  As described above, in the steam turbine plant of the third embodiment, the high-pressure moisture separation heater 27 is disposed along the axial direction C of the high-medium-pressure turbine 21. Therefore, it is possible to effectively use the space in the longitudinal direction of each of the high-pressure and moisture separators 27 and 28.

  In each of the above-described embodiments, 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 thereof are not limited to those in the embodiment, and may be appropriately set according to the scale of the steam turbine plant. It ’s good.

  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 moisture separator of this invention was demonstrated as a moisture separation heater in the above-mentioned embodiment, it is good also as a moisture separator.

  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.

DESCRIPTION OF SYMBOLS 12 Pressurized water reactor 13 Steam generator 18,38 Piping 19 Steam turbine 21 High intermediate 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 (high pressure moisture separator) )
28, 28a, 28b Low-pressure moisture separator / heater (low-pressure 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 Fourth low-pressure feed water heating Equipment 51 Steam branch piping 52 Extraction piping 61, 63 Floor 62 Foundation C Center axis direction

Claims (8)

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 high pressure moisture separator disposed on the opposite side of the low pressure turbine in the axial direction of the high and medium pressure turbine to remove moisture from the steam from the high pressure turbine section and send it to the intermediate pressure turbine section;
A low pressure moisture separator that removes moisture from the steam from the intermediate pressure turbine and sends it to the low pressure turbine;
A steam turbine plant characterized by comprising:   The steam turbine plant according to claim 1, wherein the high-pressure moisture separator is disposed along a direction intersecting the axial direction.   A deaerator is disposed on the side opposite to the low pressure turbine in the axial direction of the high and medium pressure turbine, and the high pressure moisture separator is disposed between the high and medium pressure turbine and the deaerator. The steam turbine plant according to claim 2.   The steam turbine plant according to claim 1, wherein the high-pressure moisture separator is disposed along the axial direction.   The said high pressure moisture separator is arrange | positioned on the same floor as the said high intermediate pressure turbine, the said low pressure turbine, and the said low pressure moisture separator, The Claim 1 characterized by the above-mentioned. Steam turbine plant.   The steam turbine plant according to any one of claims 1 to 4, wherein the high-pressure moisture separator is disposed on different floors above and below the high-medium pressure turbine and the low-pressure turbine.   The steam turbine plant according to any one of claims 1 to 6, wherein a plurality of the high-pressure moisture separators are arranged in parallel.   The steam turbine plant according to any one of claims 1 to 7, wherein the high-pressure moisture separator is the high-pressure moisture separator / heater.

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