JP6081544B1 - Steam turbine plant - Google Patents

Abstract

In a steam turbine plant, the structure is simplified and the equipment cost is reduced. A high and intermediate pressure turbine having a high pressure turbine section provided at one end in an axial direction C and an intermediate pressure turbine section provided at the other end, and a low pressure disposed coaxially with the high and intermediate pressure turbine. From the turbines 22 and 23, the high-pressure moisture separation heater 27 (27 a and 27 b) that removes moisture from the steam from the high-pressure turbine unit 25 and sends it to the intermediate-pressure turbine unit 26, and the steam from the intermediate-pressure turbine unit 26 A low-pressure moisture separation heater 28 (28a, 28b) for removing moisture and sending it to the low-pressure turbines 22 and 23 is provided, and the high-pressure moisture separation heater 27 and the low-pressure moisture separation heater 28 are connected to the high-medium-pressure turbine 21. They are arranged symmetrically with respect to the center line along the axial direction C. [Selection] Figure 3

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. A low-pressure turbine disposed coaxially, a high-pressure moisture separator that removes moisture from the steam from the high-pressure turbine section and sends the moisture to the intermediate-pressure turbine section, and moisture from the steam from the intermediate-pressure turbine A low-pressure moisture separator that is removed and sent to the low-pressure turbine, and the high-pressure moisture separator and the low-pressure moisture separator are left and right with respect to a center line along the axial direction of the high-medium pressure turbine. It is characterized by being arranged symmetrically.

  Therefore, by arranging the high pressure moisture separator and the low pressure moisture separator symmetrically with respect to the center line of the high and medium pressure turbine, the high pressure moisture separator can be arranged in the vicinity of the high and medium pressure turbine and the low pressure turbine. In addition, the piping length can be shortened to simplify the structure, the equipment cost can be reduced, and the turbine building can also be reduced in size.

  In the steam turbine plant of the present invention, the high-pressure moisture separator is composed of two units and is disposed on both sides of the high and medium-pressure turbine, and the low-pressure moisture separator is composed of two units on both sides of the high and medium-pressure turbine. The high-pressure moisture separator and the low-pressure moisture separator are arranged in series along the axial direction.

  Therefore, by using two high-pressure moisture separators and two low-pressure moisture separators and arranging them in series on both sides of the high and medium pressure turbines, the space in the longitudinal direction of various devices can be effectively used.

  In 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-medium-pressure turbine, and the low-pressure moisture separator is arranged on the axial center of the high-medium-pressure turbine. It is arranged on the low-pressure turbine side in the direction.

  Therefore, the high pressure moisture separator is arranged on the high and medium pressure turbine side, and the low pressure moisture separator is arranged on the low pressure turbine side, so that the high pressure moisture separator is arranged in the vicinity of the high and medium pressure turbine, and the low pressure moisture separator is arranged. Since the separator is disposed in the vicinity of the low-pressure turbine, the piping length can be shortened, the structure can be simplified, and the equipment cost can be reduced.

  In the steam turbine plant of the present invention, the high-pressure moisture separator is a single unit, and is disposed along the center line on the opposite side of the low-pressure turbine in the axial direction of the high- and medium-pressure turbine. The separator is composed of two units and is arranged on both sides of the high and medium pressure turbine.

  Therefore, one high-pressure moisture separator and two low-pressure moisture separators are arranged along the center line on the high and medium-pressure turbine side, and two low-pressure moisture separators are arranged on both sides of the high and medium-pressure turbine. Thus, effective use of the space in the longitudinal direction of various devices can be achieved.

  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, the high-pressure moisture separator and the low-pressure moisture separator are the first floor on which the high-medium pressure turbine and the low-pressure turbine are arranged, or the second floor on a different level from the first floor. It is characterized by being arranged in any one of these.

  Therefore, by arranging the high-pressure moisture separator and the low-pressure moisture separator on the same floor, 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 provided on any one of the first floor on which the high-medium-pressure turbine and the low-pressure turbine are arranged, and the second floor at a different level from the first floor. The low-pressure moisture separator is disposed on the other floor of the first floor and the second floor.

  Therefore, by arranging the high-pressure moisture separator and the low-pressure moisture separator on different floors, it is possible to secure the pipe length of the connecting pipe and reduce the adverse effects due to thermal stress, and to effectively use each floor Maintenance space can be secured and maintainability can be improved.

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

  Therefore, the thermal efficiency of the turbine plant can be further improved by appropriately heating the steam.

  According to the steam turbine plant of the present invention, the high-pressure moisture separator and the low-pressure moisture separator are arranged symmetrically with respect to the center line along the axial center direction of the high-medium pressure turbine, so that the structure can be simplified. In addition, the equipment cost can be reduced.

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 front view showing another arrangement of the steam turbine plant. FIG. 7 is a plan view showing the arrangement of the steam turbine plant of the second embodiment. FIG. 8 is a plan view showing the arrangement of the steam turbine plant of the third embodiment. FIG. 9 is a plan view showing the arrangement of the steam turbine plant of the fourth 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-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 in the limited space with respect to the steam turbine 19. ing.

  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 according to the first embodiment includes a high-medium pressure turbine 21, low-pressure turbines 22 and 23, a generator 24, and a high-pressure moisture separation heater 27 (27 a and 27 b). And a low-pressure moisture separation heater 28 (28a, 28b).

  The turbine building (not shown) is composed of a plurality of floors, and a foundation 62 is laid at the center of a floor (first floor) 61 on a predetermined floor, and the high and intermediate pressure turbines 21 and 2 are placed on the foundation 62. The low-pressure turbines 22 and 23 and the generator 24 are installed coaxially along the axial direction C.

  The low-pressure moisture separator / heater 28 is composed of two low-pressure moisture separators / heaters 28a and 28b, and is disposed on the floor 61 so as to be located 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 high-pressure moisture separator / heater 27 includes two high-pressure moisture separators / heaters 27a and 27b, and the floor 61 is positioned on both sides in the width direction (vertical direction in FIG. 3) of the high / medium-pressure turbine 21. Is placed on top. Each of the high-pressure moisture separation heaters 27a and 27b removes moisture from the steam exhausted from the high-pressure turbine unit 25 and sends it to the intermediate-pressure turbine unit 26. The outlet of the high-pressure turbine unit 25 (see FIG. 2) Steam pipes 29a and 29b are extended from the section, and the tip ends are connected to the inlet portions of the high-pressure moisture separation heaters 27a and 27b. The high-pressure and moisture separation heaters 27 a and 27 b are connected to the steam pipes 30 a and 30 b from the outlet part to the inlet part of the intermediate-pressure turbine part 26. Further, the high-pressure moisture separation heaters 27a and 27b are 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 high and medium pressure turbine 21, the low pressure turbines 22, 23, the generator 24, the high pressure moisture separation heater 27 (27a, 27b), and the low pressure moisture separation heater 28 (28a, 28b) are arranged on the same floor 61. ing.

  The high-pressure moisture separation heaters 27a and 27b and the low-pressure moisture separation heaters 28a and 28b are orthogonal to the axial direction C with respect to the center line along the axial direction C of the high and medium pressure turbines 21 and the low-pressure turbines 22 and 23. It is arranged symmetrically on both sides in the horizontal direction. In this case, the high-pressure and moisture separation heaters 27 a and 27 b are composed of two units, and are arranged on both sides of the high and medium pressure turbine 21 in parallel with the axial direction C. The low-pressure moisture separation heaters 28a and 28b are composed of two units, and are arranged on both sides of the high / medium-pressure turbine 21 and the low-pressure turbines 22 and 23 in parallel with the axial direction C. That is, the high-pressure moisture separation heaters 27a and 27b are arranged on the side opposite to the low-pressure turbines 22 and 23 in the axial direction C of the high and medium-pressure turbine 21, and the low-pressure moisture separation heaters 28a and 28b 21 in the axial direction C of the low pressure turbines 22 and 23. The high-pressure moisture separation heaters 27a and 27b and the low-pressure moisture separation heaters 28a and 28b are arranged in series along the axial direction C.

  Although not shown, the deaerator 47 (see FIG. 2) is on the floor 61 on one side in the axial direction C of the high and intermediate pressure turbine 21 along the direction intersecting the axial direction C of the high and intermediate pressure turbine 21. Are arranged. 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 separation heaters 27 a and 27 b are disposed between the high / medium-pressure turbine 21 and the deaerator 47.

  In the above-described embodiment, the high-pressure moisture separation heater 27 (27a, 27b) and the low-pressure moisture separation heater 28 (28a, 28b) are placed on the same floor 61 as the high / medium pressure turbine 21, the low pressure turbines 22, 23, and the like. Although arranged above, it is not limited to this configuration. 5 and 6 are front views showing another arrangement of the steam turbine plant.

  As shown in FIG. 5, a floor (second floor) 63 is provided below the floor 61. The high-pressure moisture separation heater 27a (27b) is provided on a lower floor 63 different from the floor 61 on which the high / medium-pressure turbine 21, the low-pressure turbines 22, 23, the low-pressure moisture separation heater 28 (28a, 28b), and the like are installed. Has been placed. However, the high-pressure moisture separation heater 27a (27b) is parallel to the axial direction C on both sides in the horizontal direction perpendicular to the axial direction C with respect to the center line along the axial direction C, as described above. It is arranged symmetrically so as to form. 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.

  Further, as shown in FIG. 6, the high-pressure moisture separation heater 27a (27b) and the low-pressure moisture separation heater 28a (28b) are composed of a floor 61 on which a high / medium-pressure turbine 21 and low-pressure turbines 22, 23 are installed. Are arranged on different lower floors 63. However, the high-pressure moisture separation heater 27a (27b) and the low-pressure moisture separation heater 28a (28b) are horizontal to the center line along the axial direction C and perpendicular to the axial direction C, as described above. They are arranged symmetrically on both sides of the direction so as to be parallel to the axial direction C.

  Although not shown, the high-pressure moisture separation heater 27a (27b) is disposed on the floor 61 on which the high and medium-pressure turbine 21 and the low-pressure turbines 22 and 23 are installed, and the low-pressure moisture separation heater 28a (28b) is disposed below. You may arrange | position on the floor 63 of this.

  Therefore, in the turbine plant of this embodiment, as shown in FIGS. 3 to 6, two high-pressure moisture separation heaters 27 (27a, 27b) and two low-pressure moisture separation heaters 28 (28a, 28b). Are arranged symmetrically with respect to the center line along the axial direction C of the high and medium pressure turbine 21 and the low pressure turbines 22 and 23. Then, in particular, the high-pressure moisture separator / heater 27 can be efficiently disposed in the vicinity of the high / intermediate pressure turbine 21, and the turbine building is arranged in the width direction (perpendicular to the axial direction C) of the high / intermediate pressure turbine 21 and the low pressure turbines 22, 23. Horizontal direction), and the pipe lengths of the steam pipes 29 and 31 are shortened, thereby simplifying the overall structure. Moreover, the symmetrical arrangement of the high-pressure moisture separation heater 27 and the low-pressure moisture separation heater 28 improves the flow rate balance of the steam and improves the performance of the entire plant.

  Then, 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 is sent to the high-pressure moisture separator / heater 27 through the steam pipe 29 where moisture is supplied. 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 high pressure moisture separator 27 (27 a and 27 b) that removes moisture from the steam from the high pressure turbine unit 25 and sends it to the intermediate pressure turbine unit 26. ) And a low-pressure moisture separation heater 28 (28a, 28b) for removing moisture from the steam from the intermediate-pressure turbine section 26 and sending it to the low-pressure turbines 22 and 23, and a high-pressure moisture separation heater 27 and a low-pressure The moisture separator 28 is disposed symmetrically with respect to the center line along the axial direction C of the high / medium pressure turbine 21.

  Therefore, 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 and 23, the pipe length can be shortened, the structure can be simplified, and the equipment cost can be reduced. The turbine building can also be reduced in size.

  In the steam turbine plant of the present embodiment, two high-pressure moisture separation heaters 27 a and 27 b are arranged on both sides of the high and medium pressure turbine 21, and two low pressure moisture separation heaters 28 a and 28 b are arranged on the high and medium pressure turbine 21. The high-pressure moisture separation heaters 27a and 27b and the low-pressure moisture separation heaters 28a and 28b are arranged in series along the axial direction C. Therefore, the space in the longitudinal direction of the high-pressure moisture separation heaters 27a and 27b and the low-pressure moisture separation heaters 28a and 28b can be effectively used.

  In the steam turbine plant of the present embodiment, the high-pressure moisture separation heater 27 is disposed on the side opposite to the low-pressure turbines 22, 23 in the axial direction C of the high-medium pressure turbine 21, and the low-pressure moisture separation heater 28 is disposed at the high-medium pressure. The turbine 21 is disposed on the low pressure turbines 22 and 23 side in the axial direction C of the turbine 21. Accordingly, the high-pressure moisture separation heater 27 is disposed in the vicinity of the high / medium-pressure turbine 21 and the low-pressure moisture separation heater 28 is disposed in the vicinity of the low-pressure turbines 22 and 23, thereby shortening the piping length and simplifying the structure. And the equipment cost can be reduced.

  In the steam turbine plant of the present embodiment, the high-pressure moisture separation heater 27 and the high-pressure moisture separation heater 28 are arranged on the floor 61 on which the high / medium-pressure turbine 21 and the low-pressure turbines 22 and 23 are arranged or on a floor different from the floor 61. It arrange | positions in either one of 63. Therefore, by arranging the high-pressure moisture separation heater 27 and the high-pressure moisture separation heater 28 on the same floor 61 (63), 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 embodiment, the high-pressure moisture separator / heater 27 is placed on one of the floor 61 on which the high / medium-pressure turbine 21 and the low-pressure turbines 22 and 23 are arranged and the floor 63 on a different level from the floor 61. The low-pressure moisture separator / heater 28 is arranged on either one of the floors 61 and 63. Therefore, by arranging the high-pressure moisture separation heater 27 and the high-pressure moisture separation heater 28 on different floors 61 and 63, it is possible to secure the pipe length of the connecting pipe and reduce the adverse effects due to thermal stress, Each floor 61, 63 can be effectively used to secure a maintenance space and improve maintainability.

[Second Embodiment]
FIG. 7 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. 7, the steam turbine plant of the second embodiment includes a high / 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 28a and 28b, and is positioned symmetrically with respect to the center line in the axial direction C on both sides in the width direction of the high / medium-pressure turbine 21. As shown in FIG. Further, the high-pressure moisture separator / heater 27 is composed of a single unit, and is disposed on the side opposite to the low-pressure turbine 22 in the axial direction C of the high / medium-pressure turbine 21. 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 second embodiment, the high-pressure moisture separation heater 27 is disposed along the axial direction C of the high-medium-pressure turbine 21. Therefore, the space in the longitudinal direction of the high-pressure moisture separation heater 27 and the low-pressure moisture separation heater 28 can be effectively used.

[Third Embodiment]
FIG. 8 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. 8, the steam turbine plant of the third embodiment has a high / 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. doing.

  The low-pressure moisture separator / heater 28 includes two low-pressure moisture separators / heaters 28a and 28b, and is disposed on the floor 61 so as to be positioned symmetrically on both sides in the width direction of the high / medium-pressure turbine 21. . The high-pressure moisture separator / heater 27 includes two high-pressure moisture separators / 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 moisture separation heaters 27a and 27b are arranged on the floor 61 along the direction intersecting the axial direction C adjacent to the high and medium-pressure turbine 21. At this time, They are arranged symmetrically. A plurality (two in this embodiment) of the high-pressure moisture separation heaters 27a and 27b are arranged in parallel at a predetermined interval in parallel.

  As described above, in the steam turbine plant of the third embodiment, the high-pressure moisture separation heater 27 is arranged in parallel as the two high-pressure moisture separation heaters 27a and 27b, and the center line in the axial center direction C is provided. And are arranged symmetrically. Therefore, the turbine building can be downsized by arranging the high-pressure moisture separation heater 27 and the low-pressure moisture separation heater 28 in an intersecting manner, and the steam from the high-pressure turbine section 25 is balanced. Can be processed well.

[Fourth Embodiment]
FIG. 9 is a plan view showing the arrangement of the steam turbine plant of the fourth 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. 9, the steam turbine plant of the fourth 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 28a and 28b, and is disposed on the floor 61 so as to be positioned symmetrically on both sides in the width direction of the high / medium-pressure turbine 21. . Further, the high-pressure moisture separator / heater 27 is composed of a single unit, and is disposed on the side opposite to the low-pressure turbine 22 in the axial direction C of the high / medium-pressure turbine 21. The high-pressure moisture separation heater 27 is disposed on the floor 61 along the direction intersecting the axial direction C adjacent to the high / medium-pressure turbine 21, and at this time, with respect to the center line in the axial direction C. They are arranged symmetrically. A deaerator 47 is arranged in parallel to be adjacent to the high-pressure moisture separator / heater 27.

  As described above, in the steam turbine plant of the fourth embodiment, one high-pressure moisture separator / heater 27 is arranged symmetrically so as to intersect the center line in the axial direction C. Therefore, the turbine building can be reduced in size by effectively using the space in the axial direction, and the steam from the high-pressure turbine section 25 can be processed in a balanced manner.

  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 above-mentioned embodiment demonstrated as a moisture separation heater, 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.

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, 27a, 27b 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 Floor (first floor)
62 Foundation 63 Floor (2nd floor)
C axial 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 that removes moisture from the steam from the high pressure turbine section and sends it to the intermediate pressure turbine section;
A low pressure moisture separator that removes moisture from steam from the intermediate pressure turbine and sends it to the low pressure turbine;
The high-pressure moisture separator and the low-pressure moisture separator are arranged symmetrically with respect to a center line along the axial direction of the high and medium pressure turbine.
A steam turbine plant characterized by that.   The high-pressure moisture separator consists of two units and is arranged on both sides of the high and medium-pressure turbine, and the low-pressure moisture separator consists of two units and is arranged on both sides of the high and medium-pressure turbine, and the high-pressure moisture separator The steam turbine plant according to claim 1, wherein the vessel and the low-pressure moisture separator are arranged in series along the axial direction.   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, and the low pressure moisture separator is disposed on the low pressure turbine side in the axial direction of the high and medium pressure turbine. The steam turbine plant according to claim 1, wherein the steam turbine plant is provided.   The high-pressure moisture separator is composed of one unit, and is disposed along the center line on the opposite side of the low-pressure turbine in the axial direction of the high-medium-pressure turbine. The low-pressure moisture separator is composed of two units. The steam turbine plant according to claim 1, wherein the steam turbine plant is disposed on both sides of the high and medium pressure turbine.   The steam turbine plant according to claim 1, wherein the high-pressure moisture separator is disposed along a direction intersecting the axial direction.   The high-pressure moisture separator and the low-pressure moisture separator are arranged on either the first floor on which the high / medium-pressure turbine and the low-pressure turbine are arranged or the second floor on a different level from the first floor. The steam turbine plant according to any one of claims 1 to 5, wherein:   The high-pressure moisture separator is disposed on one of a first floor on which the high-medium-pressure turbine and the low-pressure turbine are disposed and a second floor different from the first floor, and the low-pressure moisture separation is performed. The steam turbine plant according to any one of claims 1 to 5, wherein a vessel is disposed on the other floor of the first floor and the second floor.   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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