JP2017125460A - Steam turbine plant, nuclear power plant and method for adjusting output of steam turbine plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steam turbine plant and the like that can adjust output power while efficiently storing heat and be applied to a nuclear power plant and the like.SOLUTION: The steam turbine plant includes: a high-pressure turbine 20 to which steam is supplied; a moisture separation heater 22 for heating steam discharged from the high-pressure turbine 20; a low-pressure turbine 21 to which steam heated by the moisture separation heater 22 is supplied; and a thermal storage device 35 for exchanging heat between the steam heated by the moisture separation heater 22 and supplied to the low-pressure turbine 21 and a thermal storage material to store the heat of the steam in the thermal storage material and supplying the steam of which heat is adsorbed by the thermal storage material to the low-pressure turbine 21.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a steam turbine plant, a nuclear power plant, and a steam turbine plant output adjustment method including a heat storage device.

  In a nuclear power plant, steam generated by a steam generator is sent to a steam turbine to rotate the steam turbine. The generator connected to the steam turbine is driven by the rotation of the steam turbine to generate power. The steam used for the rotation of the steam turbine is cooled by a condenser to become condensed water. The condensate is heated by a low-pressure feed water heater or a high-pressure feed water heater and then returned to the steam generator.

  For example, a steam turbine includes a high pressure turbine and a low pressure turbine. The steam generated by the steam generator is first sent to a high-pressure turbine to rotate the high-pressure turbine. The steam used for the rotation of the high-pressure turbine is sent to a moisture separator / heater via a pipe, where the moisture is removed and heated. Thereafter, the heated steam is sent to a low-pressure turbine through a pipe, and rotates the low-pressure turbine.

  Here, a nuclear power generation facility including a heat storage device is known as a nuclear power plant (see, for example, Patent Document 1). A main steam extraction pipe branched from a main steam pipe connected to the steam generator and the high-pressure turbine is connected to the heat storage device. The main steam extraction pipe is connected to a low pressure extraction pipe led from a low pressure turbine. In this nuclear power generation facility, when electric power demand decreases, a part of the main steam is introduced into the heat storage device, so that the heat of surplus steam is stored in the heat storage device.

Japanese Patent Laid-Open No. 04-140699

  Here, the heat storage device disclosed in Patent Document 1 stores heat of steam including main steam by supplying main steam from a steam generator and supplying steam discharged from a low-pressure turbine. At this time, since the main steam is high-pressure and high-temperature steam, when the heat storage device is heated, the latent heat of the main steam is used. That is, saturated drainage is generated by the high-pressure main steam being absorbed by the heat storage device. For this reason, the vapor | steam utilized and discharged | emitted by a thermal storage apparatus will contain moisture. The moisture-containing steam is difficult to return to the high and low pressure turbines. Moreover, since the steam discharged from the low-pressure turbine has a low temperature, the amount of heat that can be absorbed from the steam is small, and it is difficult to improve the heat storage efficiency.

  Then, this invention makes it a subject to provide the output adjustment method of a steam turbine plant, a nuclear power plant, and a steam turbine plant which can adjust an output, performing heat storage efficiently.

  The steam turbine plant of the present invention includes a high pressure turbine to which steam is supplied, a heater for heating the steam discharged from the high pressure turbine, a low pressure turbine to which the steam heated by the heater is supplied, and the low pressure Heat is exchanged between the steam heated by the heater supplied to the turbine and the heat storage material, and the heat of the steam is stored in the heat storage material, and the heat absorbed by the heat storage material is stored in the low-pressure turbine. And a heat storage device that supplies the heat.

  In the steam turbine plant output adjusting method according to the present invention, the high pressure turbine to which steam is supplied, the heater for heating the steam discharged from the high pressure turbine, and the steam heated by the heater are supplied. A steam turbine plant output adjustment method comprising: a low-pressure turbine; and a heat storage device that stores heat in the heat storage material, between the steam heated by the heater supplied to the low-pressure turbine and the heat storage material The heat of the steam is stored in the heat storage material, and the steam absorbed by the heat storage material is supplied to the low-pressure turbine to adjust the output of the steam turbine plant. .

  According to these configurations, when the required output to the steam turbine plant is small, low-pressure steam before being supplied to the low-pressure turbine heated by the heater can be supplied to the heat storage device. At this time, since the low-pressure steam is heated by the heater to become superheated steam, the heat storage material of the heat storage device can be heated using the sensible heat of the low-pressure steam. Further, since the sensible heat of the low-pressure steam is used, the steam absorbed by the heat storage material can be supplied to the low-pressure turbine because generation of moisture is suppressed. Since the amount of heat that can be absorbed from the low-pressure steam is large, heat can be efficiently stored in the heat storage material with a small amount of steam. From the above, it is possible to efficiently store heat in the heat storage material using sensible heat of steam, and the actual output of the steam turbine plant is reduced by supplying steam absorbed by the heat storage material to the low-pressure turbine. Can be adjusted to.

  Moreover, it is preferable that the steam heated by the heater supplied to the low-pressure turbine and the steam absorbed by the heat storage material are steam having a saturation temperature or higher.

  According to this configuration, it is possible to suppress the steam from condensing and generating moisture, and thus it is possible to suppress the supply of steam containing moisture to the low-pressure turbine. For this reason, the influence of moisture on the low-pressure turbine can be reduced, and the operation of the low-pressure turbine can be suitably performed.

  Further, the heater is a moisture separation heater through which steam discharged from the high-pressure turbine flows, and the moisture separation heater has the heat storage material and steam on the downstream side in the steam distribution direction. It is preferable to have a heat exchange part for heat exchange.

  According to this configuration, heat can be exchanged between the steam immediately after heating and the heat storage material on the downstream side (the latter stage side) of the moisture separation heater. In addition, it is more preferable to provide a heat exchange part in the most downstream side (final stage) of a moisture separation heater.

  In addition, the heat storage device includes a high temperature side storage unit that stores the heat storage material after heat storage, a low temperature side storage unit that stores the heat storage material after heat dissipation, and the low temperature side storage unit toward the high temperature side storage unit. A heat storage side flow path through which the heat storage material circulates, a heat storage side heat exchange part provided in the heat storage side flow path, where heat exchange is performed between the heat storage material and steam, and from the high temperature side storage part to the low temperature side A heat dissipation side heat exchange in which heat exchange is performed between the heat storage material and the heat medium that contributes to an increase in output, provided in the heat dissipation side flow path, through which the heat storage material flows toward the storage section. Part.

  Moreover, the heat storage material after heat storage and the heat medium contributing to the increase in the output of the steam turbine plant are heat-exchanged, and the heat of the heat storage material is radiated to the heat medium, whereby the output of the steam turbine plant Is preferably adjusted.

  According to this structure, it can adjust so that the actual output of a steam turbine plant may rise by radiating the heat stored by the heat storage device to the heat medium.

  Moreover, it is preferable that the said thermal storage apparatus becomes a closed loop through which the said thermal storage material circulates between the said low temperature side storage part and the said high temperature side storage part.

  According to this configuration, the heat storage material can be prevented from flowing out of the heat storage device.

  Moreover, it is preferable that the said thermal storage apparatus further has an adjustment mechanism which adjusts the thermal storage amount of the said thermal storage material, and the thermal radiation amount of the said thermal storage material.

  According to this configuration, the adjustment mechanism adjusts the heat storage amount of heat to the heat storage material and the heat radiation amount of heat from the heat storage material according to the required output to the steam turbine plant. The actual output can be adjusted.

  The nuclear power plant of the present invention is supplied with a steam, a steam generator that generates steam by exchanging heat with the primary cooling water heated by the reactor, and steam generated by the steam generator. The steam turbine plant described above.

  According to this configuration, it is possible to provide a nuclear power plant that can adjust the actual output according to the required output.

FIG. 1 is a schematic configuration diagram illustrating a nuclear reactor system of a nuclear power plant according to the first embodiment. FIG. 2 is a schematic configuration diagram illustrating a turbine system of the nuclear power plant according to the first embodiment. FIG. 3 is a schematic configuration diagram illustrating an example of a turbine system during heat dissipation of the heat storage device. FIG. 4 is a schematic configuration diagram illustrating an example of a turbine system during heat dissipation of the heat storage device. FIG. 5 is a schematic configuration diagram illustrating an example of a turbine system during heat dissipation of the heat storage device. FIG. 6 is a schematic configuration diagram illustrating a turbine system of the nuclear power plant according to the second embodiment.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same. Furthermore, the constituent elements described below can be appropriately combined, and when there are a plurality of embodiments, the embodiments can be combined.

[Embodiment 1]
FIG. 1 is a schematic configuration diagram illustrating a nuclear reactor system of a nuclear power plant according to the first embodiment. FIG. 2 is a schematic configuration diagram illustrating a turbine system of the nuclear power plant according to the first embodiment.

  An example of a plant to which the steam turbine plant according to the first embodiment is applied is a nuclear power plant 100. The nuclear power plant 100 includes a nuclear reactor system (primary cooling system) 5 shown in FIG. 1 and a turbine system (secondary cooling system) 6 shown in FIG.

  As shown in FIG. 1, the nuclear reactor system 5 includes a nuclear reactor containment vessel 11 in which a nuclear reactor 12 and a steam generator 13 are stored. For example, a pressurized water reactor (PWR) is used as the nuclear reactor 12. The reactor 12 and the steam generator 13 are connected by pipes 14 and 15. A pressurizer 16 is provided in the pipe 14. A primary cooling water pump 17 is provided in the pipe 15.

  In the nuclear reactor 12, light water is used as a reactor coolant (primary coolant) and a neutron moderator. In the nuclear reactor 12, the primary cooling water is heated by low-enriched uranium or MOX which is a fuel (nuclear fuel). The primary cooling water is maintained at a predetermined high pressure by the pressurizer 16 and is sent to the steam generator 13 through the pipe 14 in a state of becoming high-temperature high-pressure water. In the nuclear reactor 12, the reactor system 5 is controlled by the pressurizer 16 to maintain a high pressure state of about 150 to 160 atm in order to suppress boiling of the primary cooling water in the core. 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 reactor 12 through the pipe 15. The steam generator 13 is connected to the turbine system 6 via pipes 18 and 43.

  As shown in FIG. 2, the turbine system 6 includes a high-pressure turbine 20, a low-pressure turbine 21, a moisture separation heater 22, a condenser 23, low-pressure feed water heaters 24 to 27, and a deaerator 28. The high-pressure feed water heaters 29 and 30 and the heat storage device 35 are included.

  The high-pressure turbine 20 is connected to the pipe 18 at the inlet. The high-pressure turbine 20 is driven to rotate by supplying steam from the pipe 18. A steam pipe 40 is connected between the outlet of the high-pressure turbine 20 and the inlet of the moisture separator / heater 22.

  The moisture separation heater 22 is supplied with steam from the steam pipe 40 and heats the supplied steam. A steam pipe 41 is connected between the outlet of the moisture separator / heater 22 and the inlet of the low-pressure turbine 21.

  The low-pressure turbine 21 is driven to rotate by being supplied with steam from the steam pipe 41. A steam pipe 42 is connected between the outlet of the low-pressure turbine 21 and the inlet of the condenser 23.

  The condenser 23 is supplied with steam from the steam pipe 42, cools the supplied steam with cooling water, condenses it into condensate, and discharges this condensate as feed water that is secondary cooling water. For example, seawater is used as the cooling water for cooling the steam. A pipe 43 is connected between the outlet of the condenser 23 and the inlet of the steam generator 13.

  The pipe 43 is provided with low-pressure feed water heaters 24, 25, 26, and 27 in order along the direction in which the feed water flows. Steam pipes 44, 45, 46, and 47 through which steam extracted from the low-pressure turbine 21 flows are connected to the low-pressure feed water heaters 24, 25, 26, and 27, and are supplied from the steam pipes 44, 45, 46, and 47, respectively. Each water supply is heated by steam.

  In addition, the pipe 43 is provided with a deaerator 28 on the downstream side of the low-pressure feed water heater 27, and on the downstream side of the deaerator 28, the high-pressure feed water heaters 29 and 30 are sequentially arranged in the direction in which the feed water flows. Is provided. A drain pipe 51 branched from the steam pipe 40 is connected to the deaerator 28, and moisture (drain) contained in the steam flowing through the steam pipe 40 flows into the deaerator 28. Steam pipes 52 and 53 through which steam extracted from the high-pressure turbine 20 flows are connected to the high-pressure feed water heaters 29 and 30, respectively, and the feed water is heated by steam supplied from the steam pipes 52 and 53, respectively.

  Next, the moisture separation heater 22 will be described. The moisture separator / heater 22 includes a moisture separator 61 and three stages of heat exchange units 62 to 64. The moisture separation heater 22 includes, in order from the inlet side to the outlet side, the moisture separator 61 arranged on the most upstream side, the first heat exchange unit 62 in the first stage, and the second stage. The second heat exchanging part 63 and the third heat exchanging part 64 which is arranged on the most downstream side and is the final stage.

  The moisture separator 61 is connected to the steam pipe 40 and introduces steam from the steam pipe 40. The moisture separator 61 is disposed at the end of the moisture separation heater 22 on the inlet side. A drain pipe 71 is connected between the moisture separator 61 and the deaerator 28. The drain generated in the moisture separator 61 flows into the deaerator 28 through the drain pipe 71 and is used as water supply.

  The first heat exchanging unit 62 includes a heat transfer tube 81 inside, and a steam pipe 66 branched from the steam pipe 53 is connected to an inlet portion of the heat transfer pipe 81. Further, a drain pipe 72 is connected between the outlet portion of the heat transfer pipe 81 and the high-pressure feed water heater 29. The first heat exchange unit 62 performs heat exchange inside and outside the heat transfer tube 81, thereby extracting steam from the high pressure turbine 20 flowing outside the heat transfer tube 81 from the high pressure turbine 20 flowing inside the heat transfer tube 81. Heat with steam. And the vapor | steam after distribute | circulating the inside of the heat exchanger tube 81 flows in into the high voltage | pressure feed water heater 29 through the drain piping 72, and heats feed water.

  The second heat exchanging unit 63 has a heat transfer tube 82 therein, and a steam pipe 67 branched from the pipe 18 is connected to the inlet of the heat transfer pipe 82. Further, a drain pipe 73 is connected between the outlet portion of the heat transfer tube 82 and the high-pressure feed water heater 30. The second heat exchanging unit 63 generates steam that circulates the steam from the first heat exchanging unit 62 that circulates outside the heat transfer tube 82 and the inside of the heat transfer tube 82 by exchanging heat inside and outside the heat transfer tube 82. Heat with steam from vessel 13. And the steam after distribute | circulating the inside of the heat exchanger tube 82 flows in into the high voltage | pressure feed water heater 30 through the drain piping 73, and heats feed water.

  The third heat exchanging unit 64 constitutes a part of the heat storage device 35. The third heat exchanging unit 64 has a heat transfer tube 83 inside, and a low temperature side pipe 103 a of a heat storage device 35 to be described later is connected to an inlet portion of the heat transfer tube 83, and an outlet portion of the heat transfer tube 83 is connected to the heat transfer tube 83. A high temperature side pipe 103b of a heat storage device 35 to be described later is connected. The third heat exchanging unit 64 exchanges heat inside and outside the heat transfer tube 83, so that the heat storage material that circulates inside the heat transfer tube 83 is used as the steam from the second heat exchange unit 63 that circulates outside the heat transfer tube 83. Heat with. In other words, the steam heated by the second heat exchange unit 63 is absorbed (heat removed) by the heat storage material that circulates inside the heat transfer tube 83. Here, the steam supplied to the third heat exchanging unit 64 is steam that is at a low pressure and is equal to or higher than the saturation temperature, and the heat storage material is heated by the sensible heat of the steam.

  In the nuclear power plant 100 configured as described above, the steam generator 13 performs heat exchange with the high-temperature and high-pressure primary cooling water to generate steam. This steam is sent to the high-pressure turbine 20 via the pipe 18 to rotate the high-pressure turbine 20.

  The steam after rotationally driving the high-pressure turbine 20 is sent to the moisture separation heater 22 via the steam pipe 40. The steam sent to the moisture separator / heater 22 is heated while removing moisture contained in the steam, and then supplied to the low-pressure turbine 21 via the steam pipe 41. The steam supplied to the low-pressure turbine 21 rotates the low-pressure turbine 21.

  The steam after rotationally driving the low-pressure turbine 21 is cooled in the condenser 23 via the steam pipe 42 and becomes condensate. This condensate flows through the pipe 43 as feed water, and is returned to the steam generator 13 via the low pressure feed water heaters 24, 25, 26, 27, the deaerator 28, the high pressure feed water heaters 29, 30 and the like.

  Next, the heat storage device 35 will be described. The heat storage device 35 exchanges heat between the steam heated by the moisture separator / heater 22 and the heat storage material to store the heat of the steam in the heat storage material, and the steam after being absorbed by the heat storage material. By supplying the low-pressure turbine 21, the output of the nuclear power plant 100 is reduced.

  As shown in FIG. 2, the heat storage device 35 is a high temperature side tank (high temperature side storage unit) 101, a low temperature side tank (low temperature side storage unit) 102, a heat storage side pipe 103, and the heat storage side heat exchange unit. The third heat exchanging part 64, the heat radiating side pipe 104, and the heat radiating side heat exchanging part 105 are provided. The heat storage device 35 includes an adjustment mechanism 106 that adjusts the heat storage amount and the heat release amount, and a control device 107 that controls the adjustment mechanism 106.

  The high temperature side tank 101 stores a heat storage material having a high temperature after heat storage, and the low temperature side tank 102 stores a heat storage material having a low temperature after heat dissipation. Here, as the heat storage material, a molten salt is used, and a heat storage material capable of suitably storing steam sensible heat is used.

  The heat storage side pipe 103 is a pipe used during heat storage, and is a pipe through which the heat storage material flows from the low temperature side tank 102 toward the high temperature side tank 101. The heat storage side pipe 103 has a low temperature side pipe 103a and a high temperature side pipe 103b. The low temperature side pipe 103 a connects between the low temperature side tank 102 and the heat transfer pipe 83 of the third heat exchange unit 64. The low temperature side pipe 103 a is provided with a pump 108, and the pump 108 supplies a low temperature heat storage material from the low temperature side tank 102 toward the third heat exchange unit 64. The high temperature side pipe 103 b connects between the heat transfer pipe 83 of the third heat exchange unit 64 and the high temperature side tank 101. A high-temperature heat storage material flows from the third heat exchange unit 64 toward the high-temperature side tank 101 through the high-temperature side pipe 103b.

  The heat radiation side pipe 104 is a pipe used at the time of heat radiation, and is a pipe through which the heat storage material flows from the high temperature side tank 101 toward the low temperature side tank 102. The heat radiation side pipe 104 has a high temperature side pipe 104a and a low temperature side pipe 104b. The high temperature side pipe 104 a connects between the high temperature side tank 101 and the heat radiation side heat exchange unit 105. The high temperature side pipe 104 a is provided with a pump 109, and the pump 109 supplies a high temperature heat storage material from the high temperature side tank 101 toward the heat radiation side heat exchange unit 105. The low temperature side pipe 104 b connects between the heat radiation side heat exchange unit 105 and the low temperature side tank 102. A low-temperature heat storage material flows from the heat radiation side heat exchange unit 105 toward the low temperature side tank 102 through the low temperature side pipe 104b.

  The heat radiation side heat exchanging unit 105 has a heat transfer tube 110 inside, a high temperature side pipe 104 a is connected to the inlet of the heat transfer tube 110, and a low temperature side pipe 104 b is connected to the outlet of the heat transfer tube 110. Has been. The heat radiating side heat exchanging unit 105 heats the heat medium flowing outside the heat transfer tube 110 by the heat storage material flowing inside the heat transfer tube 110 by heat exchange inside and outside the heat transfer tube 110. In other words, the heat storage material that circulates inside the heat transfer tube 110 radiates heat to the heat medium that circulates outside the heat transfer tube 110. Here, the heating medium heated at the time of heat dissipation is a heating medium that contributes to an increase in the output of the nuclear power plant 100. For example, the heating medium shown in FIGS.

  The heat storage device 35 is a closed loop (closed circuit) in which the heat storage material circulates between the high temperature side tank 101 and the low temperature side tank 102. That is, the circulation flow path from the high temperature side tank 101 to the low temperature side tank 102 via the heat storage side pipe 103 and from the low temperature side tank 102 to the high temperature side tank 101 via the heat radiation side pipe 104 It is a closed loop.

  The adjustment mechanism 106 is configured using a plurality of on-off valves 111 to 116. The on-off valve 111 is provided in the low temperature side pipe 103a, the on / off valve 112 is provided in the high temperature side pipe 103b, the on / off valve 113 is provided in the high temperature side pipe 104a, and the on / off valve 114 is provided in the low temperature side pipe 104b. It has been. The on-off valve 115 is provided in the flow path through which the heat medium flows toward the heat-radiating side heat exchange unit 105, and the on-off valve 116 is provided in the flow path from which the heat medium flows out from the heat-dissipation side heat exchanging part 105. The plurality of on-off valves 111, 112, 113, 114, 115, and 116 are connected to the control device 107, and the control device 107 controls the opening and closing of the plurality of on-off valves 111, 112, 113, 114, 115, and 116. Thus, the amount of heat stored in the heat storage material and the amount of heat released are adjusted.

  The control device 107 is provided in the nuclear power plant 100 and controls each part of the nuclear power plant 100. The control device 107 adjusts the heat storage amount and the heat release amount to the heat storage material by controlling the opening and closing of the plurality of on-off valves 111, 112, 113, 114, 115, 116 of the heat storage device 35.

  Specifically, the control device 107 opens the on-off valves 111 and 112 and closes the on-off valves 113, 114, 115, and 116 during the heat storage of the heat storage material. As a result, the heat storage material is supplied from the low temperature side tank 102 to the third heat exchange unit 64 via the low temperature side pipe 103a of the heat storage side pipe 103. The heat storage material supplied to the third heat exchange unit 64 is heated by steam in the third heat exchange unit 64. At this time, since the steam is steam at a low pressure and above the saturation temperature, the heat storage material is heated by the sensible heat of the steam. The heat storage material heated in the third heat exchanging unit 64 is supplied to the high temperature side tank 101 via the high temperature side pipe 103b. Further, since the steam removed in the third heat exchanging section 64 is steam having a temperature equal to or higher than the saturation temperature, moisture is not easily generated, and even if the steam is supplied to the low-pressure turbine 21, the low-pressure turbine 21 due to moisture is used. The influence on can be suppressed. And the output of the nuclear power plant 100 falls because the heat-removed steam is supplied to the low-pressure turbine 21.

  On the other hand, the control device 107 opens the on-off valves 113, 114, 115, and 116 and closes the on-off valves 111 and 112 when the heat storage material is radiated. Thereby, the heat storage material is supplied from the high temperature side tank 101 to the heat radiation side heat exchange unit 105 via the high temperature side pipe 104a of the heat radiation side pipe 104. The heat storage material supplied to the heat radiation side heat exchange unit 105 heats the heat medium in the heat radiation side heat exchange unit 105. The heat storage material that has dissipated heat in the heat radiation side heat exchange unit 105 is supplied to the low temperature side tank 102 via the low temperature side pipe 104b. In addition, the heat input to the nuclear power plant 100 is increased by the heat medium heated in the heat radiation side heat exchange unit 105, and the output of the nuclear power plant 100 is increased.

  For this reason, the control device 107 can adjust the output of the nuclear power plant 100 by adjusting the heat storage amount and the heat radiation amount of the heat storage material by the adjustment mechanism 106 according to the required output to the nuclear power plant 100. it can.

  Next, an example of a heat medium heated during heat dissipation will be described with reference to FIGS. 3 to 5 are schematic configuration diagrams illustrating an example of a turbine system during heat dissipation of the heat storage device. As the heat medium contributing to the output increase, the drain generated in the moisture separation heater 22 shown in FIG. 3, the condensate flowing through the pipe 43 shown in FIG. 4, and the first heat exchange unit 62 shown in FIG. There is a drain discharged from the heat transfer tube 81. In addition, the heat medium shown in FIGS. 3 to 5 is an example, and is not limited to these heat mediums.

  As shown in FIG. 3, when the heat medium is drain generated in the moisture separator heater 22, the drain dissipates heat to which the pipe 121 is connected via the pipe 121 branched from the drain pipe 71. It is supplied to the side heat exchange unit 105. The drain becomes steam by being heated by the heat storage material in the heat radiating side heat exchanging section 105. The steam generated in the heat radiation side heat exchange unit 105 is supplied toward the low pressure turbine 21 via the pipe 122 connected to the steam pipe 41. Thereby, since the amount of steam supplied to the low-pressure turbine 21 increases, the output of the nuclear power plant 100 increases as the output of the low-pressure turbine 21 improves.

  As shown in FIG. 4, when the heat medium is feed water flowing through the pipe 43, the feed water is supplied to the heat radiation side heat exchange unit 105 via the pipe 123 branched from the pipe 43. The water supply is heated by the heat storage material in the heat-dissipation side heat exchange unit 105. The drain heated by the heat radiation side heat exchanging unit 105 is supplied to the deaerator 28 via a pipe 124 connected to the deaerator 28. Thereby, since the amount of steam that can be used in the low-pressure turbine 21 is increased by an amount that can suppress the amount of steam extracted from the low-pressure turbine 21 through the steam pipes 46 and 47, the output of the low-pressure turbine 21 is improved. The output of the nuclear power plant 100 increases.

  As shown in FIG. 5, when the heat medium is drain discharged from the heat transfer pipe 81 of the first heat exchange unit 62, the drain passes through the pipe 125 branched from the drain pipe 72, and the pipe 125 It is supplied to the heat radiation side heat exchange unit 105 to be connected. The drain becomes steam by being heated by the heat storage material in the heat radiating side heat exchanging section 105. The steam generated in the heat radiation side heat exchange unit 105 is supplied toward the high-pressure feed water heater 30 via the pipe 126 connected to the steam pipe 53. As a result, the amount of steam that can be used in the high-pressure turbine 20 increases as much as the amount of steam extracted from the high-pressure turbine 20 through the steam pipe 53 can be suppressed, so that the output of the high-pressure turbine 20 is improved. The output of the plant 100 increases.

  Next, an output adjustment method in the nuclear power plant 100 will be described. When the required output to the nuclear power plant 100 is small, the control device 107 opens the on-off valves 111 and 112 of the adjustment mechanism 106 and closes the on-off valves 113, 114, 115, and 116 to store heat in the heat storage device 35. I speak. Then, the low-pressure steam before being supplied to the low-pressure turbine 21 heated by the moisture separation heater 22 is absorbed by the heat storage device 35. And the steam after heat-absorbing in the heat storage apparatus 35 is supplied to the low pressure turbine 21, and the nuclear power plant 100 is adjusted so that the actual output may fall. On the other hand, when the required output to the nuclear power plant 100 is large, the control device 107 closes the on-off valves 111 and 112 of the adjustment mechanism 106 to release heat from the heat storage device 35, and the on-off valves 113, 114, 115, 116 is opened. Then, the heat storage device 35 is adjusted so that the actual output is increased by heating the heat medium that contributes to the increase in the output of the nuclear power plant 100 by heat radiation.

  As described above, according to the first embodiment, when the required output to the nuclear power plant 100 is small, the low pressure steam before being supplied to the low pressure turbine 21 heated by the moisture separation heater 22 is converted into the heat storage device 35. Can be supplied to. At this time, since the low-pressure steam is heated by the moisture separation heater 22 and becomes superheated steam, the sensible heat of the low-pressure steam is used to heat the heat storage material of the heat storage device 35. Can do. Further, since the sensible heat of the low-pressure steam is used, the steam that has been absorbed by the heat storage material can be supplied to the low-pressure turbine 21 because generation of moisture is suppressed. Since the amount of heat that can be absorbed from the low-pressure steam is large, heat can be efficiently stored in the heat storage material with a small amount of steam. From the above, the sensible heat of steam can be used to efficiently store heat in the heat storage material, and the steam after being absorbed by the heat storage material is supplied to the low-pressure turbine 21, whereby the nuclear power plant 100. The actual output can be adjusted to decrease.

  In addition, according to the first embodiment, the steam before being supplied to the low-pressure turbine 21 and the steam after being absorbed by the heat storage material can be set to the saturation temperature or higher, so that the steam is condensed and moisture is generated. And the supply of moisture-containing steam to the low-pressure turbine 21 can be suppressed. For this reason, the influence of moisture on the low-pressure turbine 21 can be reduced, and the operation of the low-pressure turbine 21 can be suitably performed.

  Further, according to the first embodiment, in the final stage of the moisture separation heater 22, the steam immediately after being heated by the second heat exchange unit 63 and the heat storage material can be heat-exchanged. For this reason, the superheated steam with the highest temperature which can utilize sensible heat can be utilized.

  Moreover, according to Embodiment 1, it adjusts so that the actual output of the nuclear power plant 100 may increase by carrying out heat exchange between the heat storage material after heat storage and the heat medium that contributes to the increase in the output of the nuclear power plant 100. be able to.

  Further, according to the first embodiment, the circulation path between the high temperature side tank 101 and the low temperature side tank 102 is a closed loop, so that the heat storage material can be prevented from flowing out of the heat storage device 35. .

  In addition, according to the first embodiment, the adjustment mechanism 106 adjusts the amount of heat stored in the heat storage material and the amount of heat released from the heat storage material according to the required output to the nuclear power plant 100. The actual output of the nuclear power plant 100 can be adjusted. Further, by using the on-off valves 111 to 116 in the adjustment mechanism 106, the timing of heat storage and heat dissipation can be made different. Furthermore, by adjusting the valve opening degree of the on-off valves 111 to 116, the heat storage amount of heat to the heat storage material and the heat radiation amount of heat from the heat storage material are adjusted, and the actual output of the nuclear power plant 100 is adjusted. be able to.

  Moreover, according to Embodiment 1, the nuclear power plant 100 which can adjust an actual output according to a request | requirement output can be provided.

[Embodiment 2]
Next, the nuclear power plant 200 according to the second embodiment will be described. In the second embodiment, parts that are different from the first embodiment will be described in order to avoid redundant descriptions, and parts that are the same as those in the first embodiment will be described with the same reference numerals. FIG. 6 is a schematic configuration diagram illustrating a turbine system of the nuclear power plant according to the second embodiment.

  In the first embodiment, the third heat exchange unit 64 of the moisture separation heater 22 is caused to function as the heat storage side heat exchange unit of the heat storage device 35. However, in the second embodiment, the heat storage side heat exchange unit 201 of the heat storage device 35 is used. Is provided separately from the moisture separation heater 22.

  The heat storage side heat exchanging part 201 has a heat transfer tube 205 inside, the low temperature side pipe 103a of the heat storage device 35 is connected to the inlet part of the heat transfer pipe 205, and the heat storage pipe 205 is connected to the outlet part of the heat transfer pipe 205. The high temperature side pipe 103b of the device 35 is connected. In addition, a pipe 211 branched from the steam pipe 41 is connected to the inlet part of the heat storage side heat exchange unit 201, and a pipe 212 that joins the steam pipe 41 is connected to the outlet part of the heat storage side heat exchange part 201. Yes. The piping 211 is provided with an opening / closing valve 213, and the piping 212 is provided with an opening / closing valve 214.

  The heat storage side heat exchanging unit 201 exchanges heat inside and outside the heat transfer tube 205, so that the heat storage material flowing inside the heat transfer tube 205 is transferred from the steam pipe 41 flowing outside the heat transfer tube 205 via the pipe 211. Heat with the steam supplied. The steam removed by the heat storage side heat exchange unit 201 is supplied toward the low-pressure turbine 21 via the pipe 212.

  As described above, also in the second embodiment, the low-pressure steam before being supplied to the low-pressure turbine 21 heated by the moisture separation heater 22 can be supplied to the heat storage device 35. For this reason, the heat storage material of the heat storage device 35 can be heated using the sensible heat of low-pressure steam.

5 Reactor system 6 Turbine system 11 Reactor containment vessel 12 Reactor 13 Steam generator 16 Pressurizer 17 Primary cooling water pump 20 High-pressure turbine 21 Low-pressure turbine 22 Moisture separation heater 23 Condenser 24-27 Low-pressure feed water heater 28 Deaerator 29, 30 High-pressure feed water heater 35 Heat storage device 61 Humidity separator 62 First heat exchange unit 63 Second heat exchange unit 64 Third heat exchange unit 100, 200 Nuclear power plant 101 High temperature side tank 102 Low temperature side Tank 103 Heat storage side pipe 104 Heat release side pipe 105 Heat release side heat exchange section 106 Adjustment mechanism 107 Control devices 111 to 116 On-off valve 201 Heat storage side heat exchange section

Claims (9)

A high-pressure turbine supplied with steam;
A heater for heating steam discharged from the high-pressure turbine;
A low-pressure turbine supplied with steam heated by the heater;
Heat exchange is performed between the steam heated by the heater supplied to the low-pressure turbine and the heat storage material, and the heat of the steam is stored in the heat storage material, and the heat absorbed by the heat storage material is stored in the heat storage material. And a heat storage device for supplying the low-pressure turbine.   The steam turbine according to claim 1, wherein the steam heated by the heater supplied to the low-pressure turbine and the steam absorbed by the heat storage material are steam having a saturation temperature or higher. plant. The heater is a moisture separation heater through which steam discharged from the high-pressure turbine flows,
3. The steam turbine plant according to claim 1, wherein the moisture separator / heater has a heat exchanging unit that exchanges heat between the heat storage material and the steam on a downstream side in a steam flow direction. 4. The heat storage device
A high-temperature side storage section for storing the heat storage material after heat storage;
A low-temperature side reservoir for storing the heat storage material after heat radiation;
A heat storage side flow path through which the heat storage material flows from the low temperature side storage section toward the high temperature side storage section;
A heat storage side heat exchanging unit provided in the heat storage side flow path, wherein heat exchange is performed between the heat storage material and steam;
A heat dissipation side passage through which the heat storage material circulates from the high temperature side reservoir to the low temperature side reservoir,
The heat radiation side heat exchange part provided in the said heat radiation side flow path and heat-exchanged between the said thermal storage material and the heat medium which contributes to an output increase is provided, The any one of Claim 1 to 3 characterized by the above-mentioned. A steam turbine plant according to claim 1.   The steam storage plant according to claim 4, wherein the heat storage device is a closed loop in which the heat storage material circulates between the low temperature side storage unit and the high temperature side storage unit.   6. The steam turbine plant according to claim 4, wherein the heat storage device further includes an adjustment mechanism that adjusts a heat storage amount of heat to the heat storage material and a heat release amount of heat from the heat storage material. A nuclear reactor,
A steam generator that generates steam by exchanging heat with the primary cooling water heated by the reactor;
A steam turbine plant according to any one of claims 1 to 6, to which steam generated by the steam generator is supplied. A high-pressure turbine supplied with steam;
A heater for heating steam discharged from the high-pressure turbine;
A low-pressure turbine supplied with steam heated by the heater;
A heat storage device for storing heat in the heat storage material, and an output adjustment method for a steam turbine plant comprising:
Heat exchange is performed between the steam heated by the heater supplied to the low-pressure turbine and the heat storage material, heat of the steam is stored in the heat storage material, and the steam absorbed by the heat storage material is stored in the heat storage material. An output adjusting method for a steam turbine plant, wherein the output of the steam turbine plant is adjusted by supplying the low pressure turbine.   The heat storage material after heat storage and the heat medium contributing to the output increase of the steam turbine plant are subjected to heat exchange, and the heat of the heat storage material is radiated to the heat medium, thereby adjusting the output of the steam turbine plant. The output adjustment method for a steam turbine plant according to claim 8.

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