Power generation facilities

Abstract

To provide a power generating unit having excellent load responsiveness to a load increase requirement.SOLUTION: A power generating unit 1 according to the present embodiment comprises a boiler 11 for producing steam, a high-pressure turbine 21 into which the steam generated by the boiler 11 is introduced, a low-pressure turbine 23 arranged at a downstream side of the high-pressure turbine 21 in a steam flow direction, and a condenser 25 for condensing the steam discharged from the low-pressure turbine 23. Also, the power generating unit 1 comprises a water supply pipe 26 for introducing condensed water which is condensed by the condenser 25 into the boiler 11 as supply water, a heat accumulation / steam producing device 60 having a heat accumulation function for storing a calorie by using unnecessary energy which is generated in the own system, and a steam producing function introduced with a part of the supply water introduced by the water supply pipe 26, and producing the steam from the supply water by the heat-accumulated calorie, and a steam supply pipe 64 for supplying the steam which is produced by the heat accumulation / steam producing device 60 to the own system.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] FIELD OF THE INVENTION An embodiment of the present invention relates to a power generation facility. [Background technology]

[0002] In recent years, the introduction of renewable energy has been accelerating in power generation facilities as a measure to reduce carbon dioxide (CO2) emissions. Renewable energy sources such as solar and wind power are derived from nature. When generating electricity using such renewable energy, the amount of power generated varies depending on factors such as the weather, making unstable power supply a problem.

[0003] Therefore, when fluctuations in the power supply occur in power generation using such renewable energy, the output of thermal power generation facilities may be adjusted in order to maintain a stable supply of power.

[0004] In thermal power generation facilities equipped with boilers and steam turbines, the boilers and steam turbines have minimum load constraints at which they can operate continuously due to equipment constraints on the boilers and steam turbines. Therefore, even during the daytime when the supply of renewable energy increases, the loads on the boilers and steam turbines cannot be reduced below the minimum load.

[0005] Generally, the minimum load is higher for boilers than for steam turbines. The minimum load can be lowered by discharging excess steam from the boiler into a condenser, but the heat of the excess steam is wasted. Therefore, in conventional steam power plants, technology is being considered to store the heat of the excess steam from the boiler. This stored heat is used as a heat source for other systems. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Utility Model Application Publication No. 62-97203 Summary of the Invention [Problem to be solved by the invention]

[0007] In the evening, when the supply of renewable energy decreases, an increase in load is required on the steam power generation facility. However, even if such an increase in load is required, the steam generation rate, which is the rate at which the steam generation rate increases over time in the boiler, is limited, so the amount of steam generated from the boiler cannot be increased immediately.

[0008] Furthermore, in conventional steam power generation facilities, when the amount of steam generated is increased, it takes a certain amount of time for the steam introduced into the steam turbine to reach a predetermined temperature and pressure.

[0009] In conventional steam power plants, the load increase rate, which is the ratio of the load increase to the time required to respond to a load increase request, depends on the boiler steam increase rate. Therefore, in conventional steam power plants, it takes a relatively long time to reach the requested load, and there is room for improvement in the load responsiveness to a load increase request.

[0010] The problem to be solved by the present invention is to provide a power generation facility that has excellent load responsiveness to requests for increased load. [Means for solving the problem]

[0011] The power generation equipment of this embodiment includes a boiler that generates steam, a first steam turbine into which the steam generated in the boiler is introduced, a second steam turbine that is located downstream of the first steam turbine in the flow direction of the steam flow, a condenser that condenses the steam discharged from the second steam turbine, and a feed water pipe that leads the condensed water condensed in the condenser to the boiler as feed water.

[0012] Furthermore, this power generation facility includes a heat storage / steam generating device having a heat storage function for storing heat by utilizing surplus energy generated in its own system, and a steam generating function for converting a portion of the feedwater introduced by the water supply pipe into steam by the stored heat, and a steam supply pipe for supplying the steam generated by the heat storage / steam generating device to its own system. an extraction pipe provided at a predetermined turbine stage of the first steam turbine; and a feedwater heater interposed in the feedwater pipe and configured to heat feedwater by extraction steam introduced from the extraction pipe. Equipped with. The surplus energy is the energy of surplus steam generated in the boiler, and the heat storage / steam generation device stores the heat contained in the surplus steam. The surplus steam that has given heat to the heat storage / steam generation device is introduced into the extraction pipe. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram showing an example of changes in boiler load and turbine load at a predetermined time in a typical steam power generation facility. [Figure 2] 1 is a system diagram schematically illustrating a configuration of a power generation facility according to a first embodiment. [Figure 3] 1 is a diagram schematically illustrating an internal configuration of a heat storage / steam generation device in a power generation facility according to a first embodiment. [Figure 4] 3 is a diagram showing the steam turbine load versus time when the load is increased based on a load increase request from a minimum load operation state in the power generation facility of the first embodiment. FIG. [Figure 5] FIG. 4 is a system diagram schematically showing another configuration of the power generation facility of the first embodiment. [Figure 6] FIG. 4 is a system diagram schematically showing another configuration of the power generation facility of the first embodiment. [Figure 7] FIG. 4 is a system diagram schematically illustrating the configuration of a power generation facility according to a second embodiment. [Figure 8] FIG. 4 is a system diagram schematically showing the configuration of a power generation facility according to a second embodiment that does not include an intermediate-pressure turbine. [Figure 9] FIG. 10 is a system diagram schematically showing another configuration of the power generation facility of the second embodiment. [Figure 10] FIG. 10 is a system diagram schematically showing another configuration of the power generation facility of the second embodiment. [Figure 11] FIG. 10 is a system diagram schematically illustrating the configuration of a power generation facility according to a third embodiment. [Figure 12] FIG. 10 is a system diagram schematically showing another configuration of the power generation facility of the third embodiment. [Figure 13] FIG. 10 is a system diagram schematically showing another configuration of the power generation facility of the third embodiment. [Figure 14] FIG. 10 is a system diagram schematically illustrating the configuration of a power generation facility according to a fourth embodiment. [Figure 15] FIG. 10 is a system diagram schematically showing another configuration of the power generation facility of the fourth embodiment. [Figure 16] FIG. 10 is a system diagram schematically showing another configuration of the power generation facility of the fourth embodiment. [Figure 17] FIG. 10 is a system diagram schematically illustrating the configuration of a power generation facility according to a fifth embodiment. [Figure 18] FIG. 10 is a diagram schematically illustrating the internal configuration of a heat storage / steam generation device in a power generation facility according to a fifth embodiment. [Figure 19] FIG. 10 is a system diagram schematically showing another configuration of the power generation facility of the fifth embodiment. [Figure 20] FIG. 10 is a system diagram schematically showing another configuration of the power generation facility of the fifth embodiment. [Figure 21] FIG. 10 is a system diagram schematically illustrating the configuration of a power generation facility according to a sixth embodiment. [Figure 22] FIG. 13 is a system diagram schematically showing another configuration of the power generation facility of the sixth embodiment. [Figure 23] FIG. 13 is a system diagram schematically showing another configuration of the power generation facility of the sixth embodiment. [Figure 24] FIG. 12 is a system diagram schematically illustrating the configuration of a power generation facility according to a seventh embodiment. [Figure 25] FIG. 13 is a diagram schematically illustrating the internal configuration of a heat storage / steam generation device in a power generation facility according to a seventh embodiment. [Figure 26] FIG. 13 is a system diagram schematically showing another configuration of the power generation facility of the seventh embodiment. [Figure 27] FIG. 13 is a system diagram schematically showing another configuration of the power generation facility of the seventh embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0015] In a steam power generation facility equipped with a boiler and a steam turbine, the boiler and the steam turbine have minimum load constraints at which they can be continuously operated due to equipment constraints in the boiler and the steam turbine.

[0016] Fig. 1 is a diagram showing an example of changes in boiler load and turbine load at a given time in a typical steam power plant, in which the solid line indicates the turbine load and the dashed line indicates the boiler load.

[0017] As shown in Figure 1, for example, during the daytime when the supply of renewable energy increases, the load on the boiler and steam turbine decreases. However, as mentioned above, the boiler and steam turbine are subject to minimum load constraints at which they can operate continuously. The minimum load is generally higher for boilers than for steam turbines. As a result, an excess load, or excess energy, occurs, which is the difference between the boiler load and the turbine load.

[0018] In the embodiment described below, this surplus energy is stored as heat, and when a load increase request is made to the steam power plant in the evening when the supply of renewable energy is reduced, the stored heat is used to generate steam. The generated steam is then used in the system itself to improve the responsiveness to the load increase.

[0019] (First embodiment) FIG. 2 is a system diagram that schematically shows the configuration of the power generation facility 1 according to the first embodiment.

[0020] 2, the power generation facility 1 includes, as main components, a boiler unit 10, a steam turbine system 20, and a heat storage / steam generation device 60. The power generation facility 1 is a steam power generation facility including the boiler unit 10 and the steam turbine system 20.

[0021] The boiler system 10 includes, for example, a boiler 11 that generates steam and a reheat boiler 12 that reheats the steam. Note that, although the boiler system 10 shown here has both the boiler 11 and the reheat boiler 12 installed side by side, the boiler 11 and the reheat boiler 12 may be configured separately.

[0022] The steam turbine system 20 includes a high-pressure turbine 21, an intermediate-pressure turbine 22, a low-pressure turbine 23, a generator 24, a condenser 25, a feedwater pipe 26, feedwater pumps 27A and 27B, feedwater heaters 28A, 28B, and 28C, and a deaerator 29. The high-pressure turbine 21 functions as a first steam turbine, the intermediate-pressure turbine 22 functions as a third steam turbine, and the low-pressure turbine 23 functions as a second steam turbine.

[0023] In the flow direction of the steam flow, the high-pressure turbine 21, the intermediate-pressure turbine 22, and the low-pressure turbine 23 are provided in this order. That is, in the flow direction of the steam flow, the intermediate-pressure turbine 22 is provided downstream of the high-pressure turbine 21, and the low-pressure turbine 23 is provided downstream of the intermediate-pressure turbine 22.

[0024] The generator 24 is connected, for example, to the low-pressure turbine 23. Here, an example is shown in which the rotors of the high-pressure turbine 21, the intermediate-pressure turbine 22, the low-pressure turbine 23, and the generator 24 are connected on a single shaft.

[0025] The outlet of the boiler 11 is connected to the inlet of the high-pressure turbine 21 via a main steam pipe 40. The main steam pipe 40 is equipped with a pressure / flow rate control valve 40a. The outlet of the high-pressure turbine 21 is connected to the inlet of the reheat boiler 12 via a low-temperature reheat steam pipe 41. The outlet of the reheat boiler 12 is connected to the inlet of the intermediate-pressure turbine 22 via a high-temperature reheat steam pipe 42. The high-temperature reheat steam pipe 42 is equipped with a pressure / flow rate control valve 42a.

[0026] The outlet of the intermediate-pressure turbine 22 is connected to the inlet of the low-pressure turbine 23 via a crossover pipe 43. In addition, the outlet of the intermediate-pressure turbine 22 is connected to a steam supply pipe 51 for connecting to the inlet of a feedwater pump drive turbine 50 for driving feedwater pumps 27A and 27B. The steam supply pipe 51 is equipped with a flow rate adjustment valve 51a. The steam supply pipe 51 also functions as a steam supply pipe for the feedwater pump drive turbine.

[0027] The outlet of the low-pressure turbine 23 is connected to the condenser 25 via an exhaust pipe 44. The feedwater outlet of the condenser 25 is connected to the inlet of the boiler 11 via a feedwater pipe 26.

[0028] In the water supply pipe 26, for example, water supply pumps 27A and 27B, water supply heaters 28A, 28B, and 28C, and a deaerator 29 are interposed.

[0029] The feedwater heater 28A is connected to a predetermined turbine stage of the low-pressure turbine 23 via an extraction pipe 45A. The feedwater heater 28B is connected to a predetermined turbine stage of the intermediate-pressure turbine 22 via an extraction pipe 45B. The feedwater heater 28C is connected to a predetermined turbine stage of the high-pressure turbine 21 via an extraction pipe 45C. The deaerator 29 is connected to, for example, a predetermined turbine stage of the intermediate-pressure turbine 22 via an extraction pipe 45D.

[0030] Furthermore, feedwater heater 28A is connected to a discharge pipe 46A that leads the extracted air after heat exchange to condenser 25. A discharge pipe 46B is provided between feedwater heater 28B and deaerator 29, leading the extracted air after heat exchange in feedwater heater 28B to deaerator 29. A discharge pipe 46C is provided between feedwater heater 28C and feedwater heater 28B, leading the extracted air after heat exchange in feedwater heater 28C to feedwater heater 28B.

[0031] Although an example in which three feedwater heaters 28A, 28B, and 28C are provided has been shown here, the configuration is not limited to this. For example, at least one feedwater heater may be provided, and four or more feedwater heaters may be provided.

[0032] Feedwater pumps 27A and 27B pump the condensed water condensed in condenser 25 as feedwater to boiler 11. Feedwater pump 27A on the upstream side functions as, for example, a low-pressure feedwater pump, and feedwater pump 27B on the downstream side functions as, for example, a high-pressure feedwater pump.

[0033] The heat storage / steam generation device 60 has a heat storage function that uses surplus energy generated in its own system to store heat, and a steam generation function that receives a portion of the feedwater conducted through the water supply pipe 26 and converts the feedwater into steam using the stored heat. The heat storage function works when surplus energy is used to store heat. The steam generation function works when the feedwater is converted into steam using the stored heat.

[0034] Here, the configuration for exerting the heat storage function in the power generation facility 1 of the first embodiment shown in Fig. 2 is referred to as a first heat storage structure, and the configuration for exerting the steam generation function is referred to as a first steam generation structure. Also, operation in the first heat storage structure is referred to as a first heat storage mode operation, and operation in the first steam generation structure is referred to as a first steam generation mode operation.

[0035] The first heat storage structure includes a heat storage / steam generation device 60, a heat storage steam supply pipe 61, a heat storage steam discharge pipe 62, and a drain pipe 66. The first steam generation structure includes a heat storage / steam generation device 60, a steam generation water supply pipe 63, a steam supply pipe 64, and a heat storage material water supply pipe 65.

[0036] The heat storage / steam generation device 60 is equipped with a chemical heat storage material. Here, a case where a CaO / H2O-based or MgO / H2O-based chemical heat storage material that utilizes a dehydration reaction and a hydration reaction is used is shown as an example. The configuration of the heat storage / steam generation device 60 will be described later.

[0037] As shown in FIG. 2, the heat storage / steam generation device 60 is connected to a heat storage steam supply pipe 61, a heat storage steam discharge pipe 62, a steam generation water supply pipe 63, a steam supply pipe 64, a heat storage material water supply pipe 65, and a drain pipe 66.

[0038] During the first heat storage mode operation, the heat storage steam supply pipe 61 supplies heat storage steam (surplus steam) to the heat storage / steam generation device 60. One end of the heat storage steam supply pipe 61 is connected to the main steam pipe 40 between the boiler 11 and the pressure / flow rate control valve 40a, and the other end of the heat storage steam supply pipe 61 is connected to the heat storage / steam generation device 60. The heat storage steam supply pipe 61 is equipped with a flow rate control valve 61a.

[0039] The heat storage steam discharge pipe 62 discharges steam that has given heat to the heat storage material in the heat storage / steam generation device 60. One end of the heat storage steam discharge pipe 62 is connected to the low-temperature reheat steam pipe 41. The other end of the heat storage steam discharge pipe 62 is connected to the heat storage / steam generation device 60. The heat storage steam discharge pipe 62 is equipped with a flow rate adjustment valve 62a.

[0040] During operation in the first steam generation mode, the steam generation feedwater supply pipe 63 supplies a portion of the feedwater to the thermal storage / steam generation device 60. One end of the steam generation feedwater supply pipe 63 is connected to the feedwater pipe 26. The other end of the steam generation feedwater supply pipe 63 is connected to the thermal storage / steam generation device 60. The steam generation feedwater supply pipe 63 is equipped with a flow rate adjustment valve 63a.

[0041] Here, an example is shown in which one end of the steam generating feedwater supply pipe 63 is connected to the feedwater pipe 26 between the feedwater heater 28A and the deaerator 29, but the configuration is not limited to this. The connection position of the steam generating feedwater supply pipe 63 to the feedwater pipe 26 is set appropriately based on, for example, the set temperature and set pressure of the feedwater to be supplied to the thermal storage / steam generation device 60.

[0042] For example, the steam generating feedwater supply pipe 63 may be connected to the feedwater pipe 26 between the deaerator 29 and the feedwater pump 27B. Also, the steam generating feedwater supply pipe 63 may be connected to the feedwater pipe 26 between the feedwater heater 28A and the feedwater pump 27A. Note that in order to supply feedwater to the thermal storage / steam generation device 60 via the steam generating feedwater supply pipe 63, the steam generating feedwater supply pipe 63 is connected to the feedwater pipe 26 downstream of the feedwater pump 27A.

[0043] During steam generation mode operation, the steam supply pipe 64 supplies the steam generated in the thermal storage / steam generation device 60 to its own system. One end of the steam supply pipe 64 is connected to, for example, the crossover pipe 43. The other end of the steam supply pipe 64 is connected to the thermal storage / steam generation device 60. The steam supply pipe 64 is equipped with a flow rate adjustment valve 64a.

[0044] The thermal storage material water supply pipe 65 supplies water or steam used in the hydration reaction in the chemical thermal storage material during first steam generation mode operation. One end of the thermal storage material water supply pipe 65 is connected to, for example, the air extraction pipe 45A. The other end of the thermal storage material water supply pipe 65 is connected to the thermal storage / steam generation device 60. The thermal storage material water supply pipe 65 is equipped with a flow rate adjustment valve 65a.

[0045] For example, a flow rate adjustment valve 80 is provided in the extraction pipe 45A closer to the feed water heater 28A than the position where one end of the thermal storage material water supply pipe 65 is connected.

[0046] Here, an example is shown in which one end of the heat storage material water supply pipe 65 is connected to the air extraction pipe 45A. One end of the heat storage material water supply pipe 65 may be connected to another air extraction pipe 45B, 45C, or 45D, for example. One end of the heat storage material water supply pipe 65 may be connected to a pipe that can obtain water or steam that satisfies the conditions necessary for the hydration reaction in the heat storage / steam generation device 60.

[0047] The drain pipe 66 discharges water or steam generated by a dehydration reaction in the chemical thermal storage material during first thermal storage mode operation. One end of the drain pipe 66 is connected to the condenser 25. The other end of the drain pipe 66 is connected to the thermal storage / steam generation device 60. The drain pipe 66 is equipped with a flow rate adjustment valve 66a.

[0048] Here, FIG. 3 is a diagram that schematically shows the internal configuration of the heat storage / steam generation device 60 in the power generation facility 1 of the first embodiment.

[0049] As shown in FIG. 3, the heat storage / steam generation device 60 includes an apparatus container 70 , an inner container 71 , a chemical heat storage material 72 , and heat exchange piping 73 .

[0050] The device container 70 is made up of a housing and houses an internal container 71. The internal container 71 is made up of a housing, and the inside of the internal container 71 is filled with a chemical heat storage material 72. Furthermore, heat exchange piping 73 is arranged in a serpentine manner inside the internal container 71. That is, the heat exchange piping 73 is arranged in a serpentine manner between the chemical heat storage materials 72 while being in contact with the chemical heat storage materials 72.

[0051] One end of the heat exchange pipe 73 branches into two. One branch is connected to the heat storage steam supply pipe 61, and the other branch is connected to the steam generation feedwater supply pipe 63. The other end of the heat exchange pipe 73 branches into two. One branch is connected to the heat storage steam discharge pipe 62, and the other branch is connected to the steam supply pipe 64.

[0052] A heat storage material water supply pipe 65 is connected to one side of the inner container 71. A drain pipe 66 is connected to the other side of the inner container 71 opposite to the one side.

[0053] Here, the chemical heat storage material 72 is a heat storage material that can store and release heat by utilizing the heat of a chemical reaction that occurs when a reaction medium and a heat storage material come into contact with each other. The chemical heat storage material 72 stores and releases heat by utilizing reversible endothermic and exothermic reactions. Examples of the chemical heat storage material 72 include a CaO / H2O-based chemical heat storage material and an MgO / H2O-based chemical heat storage material. However, the chemical heat storage material 72 is not limited to these, and may be any chemical heat storage material that can store and release heat by utilizing reversible endothermic and exothermic reactions.

[0054] When a chemical heat storage material is used, the stored heat can be released when needed as long as no chemical change occurs. In other words, the chemical heat storage material can maintain a heat storage state for a long period of time.

[0055] Next, the operation of the power generation facility 1 will be described.

[0056] (Major functions in the steam turbine system 20) First, the main operation of the steam turbine system 20 of the power generation facility 1 will be described with reference to FIG.

[0057] The steam introduced from the main steam pipe 40 into the high-pressure turbine 21 rotates the high-pressure turbine 21, and then is introduced into the reheat boiler 12 via a low-temperature reheat steam pipe 41. The steam superheated in the reheat boiler 12 is introduced into the intermediate-pressure turbine 22 via a high-temperature reheat steam pipe 42.

[0058] The steam introduced into the intermediate-pressure turbine 22 rotates the intermediate-pressure turbine 22, and then is introduced into the low-pressure turbine 23 via the crossover pipe 43. A portion of the steam discharged from the intermediate-pressure turbine 22 is introduced into the feedwater pump drive turbine 50 via a steam supply pipe 51. The steam introduced into the feedwater pump drive turbine 50 rotates the feedwater pump drive turbine 50. This rotation of the feedwater pump drive turbine 50 drives the feedwater pumps 27A and 27B. The steam that has rotated the feedwater pump drive turbine 50 is introduced into the condenser 25, for example.

[0059] The steam introduced into the low-pressure turbine 23 rotates the low-pressure turbine 23, and then is introduced into the condenser 25 via an exhaust pipe 44. The generator 24 is driven by the rotation of the low-pressure turbine 23 and generates electricity.

[0060] The steam introduced into condenser 25 condenses to form condensed water. The condensed water in feedwater pipe 26 is pumped as feedwater by feedwater pumps 27A and 27B and introduced to boiler 11 via feedwater pipe 26. Note that as the feedwater flows through feedwater pipe 26, it is heated by extracted steam in feedwater heaters 28A, 28B, and 28C. The feedwater is also deaerated in deaerator 29.

[0061] (Operation of the heat storage / steam generating device 60: during first heat storage mode operation) Next, the operation of the heat storage / steam generation device 60 in the first heat storage mode operation will be described with reference to FIGS.

[0062] As mentioned above, when the boiler and steam turbine are operated at minimum load during the daytime when the supply of renewable energy increases, surplus energy is generated, which is the difference between the boiler load and the turbine load. In the thermal storage mode operation, this surplus energy is stored in the thermal storage / steam generation device 60. Note that this surplus energy is surplus energy generated in the system itself.

[0063] During the first heat storage mode operation, the flow rate control valve 61a of the heat storage steam supply pipe 61 and the flow rate control valve 62a of the heat storage steam discharge pipe 62 are opened. The flow rate control valve 61a is adjusted so that surplus steam having surplus energy and generated in the boiler 11 is supplied to the heat storage steam supply pipe 61.

[0064] The flow rate adjustment valve 63a of the steam generating water supply pipe 63 and the flow rate adjustment valve 64a of the steam supply pipe 64 are closed. The flow rate adjustment valve 65a of the heat storage material water supply pipe 65 is closed, and the flow rate adjustment valve 66a of the drain pipe 66 is opened.

[0065] In addition, the open / closed states of the flow control valves 61a, 62a, 63a, 64a, 65a, and 66a during heat storage mode operation in each of the embodiments described below are the same as the open / closed states of the flow control valves 61a, 62a, 63a, 64a, 65a, and 66a during the first heat storage mode operation described above.

[0066] Surplus steam generated in the boiler 11 is introduced from the main steam pipe 40 through the heat storage steam supply pipe 61 into the heat exchange pipe 73 .

[0067] Here, for example, when storing heat in a CaO / H2O-based chemical heat storage material 72, the excess steam introduced into the heat exchange piping 73 provides heat to the chemical heat storage material 72 in the state of Ca(OH)2. In other words, the excess steam introduced into the heat exchange piping 73 heats the chemical heat storage material 72 in the state of Ca(OH)2. Heat is stored by the resulting dehydration reaction in which Ca(OH)2 separates into CaO and H2O.

[0068] At this time, the dehydration reaction is promoted by heating the chemical thermal storage material 72 to a temperature of 400 to 500°C by the excess steam flowing through the heat exchange piping 73. The water produced by the dehydration reaction is discharged to the condenser 25 via the drain pipe 66.

[0069] For example, when storing heat in an MgO / H2O-based chemical heat storage material 72, the excess steam introduced into the heat exchange piping 73 provides heat to the chemical heat storage material 72 in the Mg(OH)2 state. In other words, the excess steam introduced into the heat exchange piping 73 heats the chemical heat storage material 72 in the Mg(OH)2 state. Heat is stored by the resulting dehydration reaction that separates Mg(OH)2 into MgO and H2O.

[0070] At this time, the dehydration reaction is promoted by heating the chemical thermal storage material 72 to a temperature of 200 to 400°C by the excess steam flowing through the heat exchange piping 73. The water produced by the dehydration reaction is discharged to the condenser 25 via the drain pipe 66.

[0071] The surplus steam that has given heat to the chemical heat storage material 72 is introduced into the low-temperature reheat steam pipe 41 via the heat storage steam discharge pipe 62 .

[0072] (Operation of the heat storage / steam generating device 60: during operation in the first steam generating mode) Next, the action of the heat storage / steam generation device 60 during first steam generation mode operation will be described with reference to Fig. 2 and Fig. 3. Here, during steam generation mode operation, the action of the chemical thermal storage material 72 is to release the stored heat.

[0073] As mentioned above, in the evening when the supply of renewable energy decreases, an increase in load is required for the steam power plant. In the steam generation mode operation, when an increase in load is required, the stored heat is used to generate steam for use in the own system.

[0074] During first steam generation mode operation, the flow rate adjustment valve 61a of the heat storage steam supply pipe 61 and the flow rate adjustment valve 62a of the heat storage steam discharge pipe 62 are closed. The flow rate adjustment valve 63a of the steam generation feedwater supply pipe 63 and the flow rate adjustment valve 64a of the steam supply pipe 64 are opened. The flow rate adjustment valve 65a of the heat storage material water supply pipe 65 is opened, and the flow rate adjustment valve 66a of the drain pipe 66 is closed.

[0075] In addition, the open / closed states of the flow control valves 61a, 62a, 63a, 64a, 65a, and 66a during steam generation mode operation in each of the embodiments described below are the same as the open / closed states of the flow control valves 61a, 62a, 63a, 64a, 65a, and 66a during the first steam generation mode operation described above.

[0076] For example, when heat is released in a CaO / HO-based chemical heat storage material 72, the extracted air from the air extraction pipe 45A is supplied to the chemical heat storage material 72 in a CaO state via the heat storage material water supply pipe 65. Heat is released by the hydration reaction that occurs as a result, in which water vapor and CaO combine.

[0077] For example, when dissipating heat in an MgO / H2O-based chemical thermal storage medium 72, the extracted air from the air extraction pipe 45A is supplied to the chemical thermal storage medium 72 in the state of MgO via the thermal storage medium water supply pipe 65. Heat is dissipated by the hydration reaction that occurs as a result, in which water vapor and MgO combine.

[0078] Here, the amount of heat released in the hydration reaction in the chemical thermal storage material 72 is adjusted, for example, by the amount of steam supplied via the thermal storage material water supply pipe 65. Note that, although an example in which steam is supplied to the chemical thermal storage material 72 via the thermal storage material water supply pipe 65 has been shown here, the same effects as when steam is supplied can also be obtained when water is supplied.

[0079] The feedwater supplied from the steam generation feedwater supply pipe 63 to the heat exchange pipe 73 is heated by heat radiation from the chemical thermal storage medium 72, and becomes superheated steam. The steam generated in the thermal storage / steam generation device 60 is supplied to, for example, the crossover pipe 43 via a steam supply pipe 64. The steam supplied to the crossover pipe 43 is introduced into the low-pressure turbine 23 together with steam discharged from the intermediate-pressure turbine 22. This increases the amount of steam introduced into the low-pressure turbine 23, and increases the turbine output.

[0080] Fig. 4 is a diagram showing the steam turbine load versus time when the load is increased based on a load increase request from a minimum load operating state in the power generation facility 1 of the first embodiment. For comparison, Fig. 4 also shows the steam turbine load in a conventional steam power generation facility that does not include the thermal storage / steam generation device 60 by a dashed dotted line. Time t1 is the time when the load increase request is made.

[0081] As shown in Fig. 4, the steam turbine load increases after time t1 when a load increase request is made in the power generation facility 1. Then, at time t4, the power generation facility 1 reaches a predetermined steam turbine load. Here, at time t1, the operation mode is switched from the thermal storage mode to the steam generation mode, so the steam introduced for thermal storage to the thermal storage / steam generation device 60 via the thermal storage steam supply pipe 61 is cut off. Then, the steam that was introduced into the thermal storage / steam generation device 60 is introduced into the high-pressure turbine 21, so the steam turbine load increases from time t1.

[0082] Here, between time t1 and time t2, the heat storage / steam generation device 60 is in an idling state to start the hydration reaction of the chemical thermal storage material 72. Then, when time t2 is reached, steam is supplied from the heat storage / steam generation device 60. Therefore, after time t2, the rate of increase in the steam turbine load with respect to time becomes large.

[0083] On the other hand, in a conventional steam power generation facility, the steam turbine load does not increase from time t1 when the load increase request was made to time t3. This is because when the steam generation rate is increased, it takes a certain amount of time for the steam introduced into the steam turbine to reach the specified temperature and pressure.

[0084] In the conventional steam power generation facility, the steam turbine load increases after time t3, and reaches a predetermined steam turbine load at time t5.

[0085] The power generation facility 1 supplies the amount of heat equivalent to the area shown by the hatched area in Fig. 4 as steam to the low-pressure turbine 23 until a predetermined steam turbine load is reached in a conventional steam power generation facility. This allows the power generation facility 1 to have excellent responsiveness to load increases and reach the required load in a short time.

[0086] As described above, the power generation facility 1 of the first embodiment is provided with the heat storage / steam generation device 60, which allows it to store surplus energy generated in its own system. Furthermore, when a load increase request is made, the heat storage / steam generation device 60 can generate steam using the stored heat. The steam generated in the heat storage / steam generation device 60 is introduced into its own system, for example, the low-pressure turbine 23. This allows the power generation facility 1 to reach the requested load in a short time, resulting in excellent responsiveness to load increases.

[0087] Here, in the power generation facility 1 described above, in addition to the configuration in which the extracted steam from the intermediate-pressure turbine 22 and the low-pressure turbine 23 is introduced into the feedwater heaters 28A and 28B, some power generation facilities are equipped with a configuration in which the extracted steam from the intermediate-pressure turbine 22 and the low-pressure turbine 23 is supplied to, for example, external equipment. Fig. 2 shows, for example, an extraction pipe 45E that supplies the extracted steam from the low-pressure turbine 23 to external equipment.

[0088] An example of the external equipment is a vaporizer that vaporizes the liquid fuel to be burned in the boiler apparatus 10. Another example of the external equipment is a carbon dioxide capture and storage system (CCS system) that captures and stores carbon dioxide emitted from the boiler apparatus 10. The external equipment is not particularly limited, and may be any equipment that uses the extracted steam from the high-pressure turbine 21, the intermediate-pressure turbine 22, or the low-pressure turbine 23.

[0089] Even in this case, during operation in the first steam generation mode, the steam generated in the heat storage / steam generation device 60 is introduced into the low-pressure turbine 23 via the steam supply pipe 64, thereby achieving the effect of excellent load responsiveness as described above.

[0090] In this case, for example, the supply of extracted steam from the intermediate-pressure turbine 22 and the low-pressure turbine 23 to the external equipment may be blocked, and the steam generated in the heat storage / steam generation device 60 may be supplied to the external equipment. In this case, the working fluid flowing through the intermediate-pressure turbine 22 and the low-pressure turbine 23 is not extracted, so the flow rate of the working fluid flowing through the intermediate-pressure turbine 22 and the low-pressure turbine 23 increases. This provides the effect of excellent load responsiveness as described above.

[0091] (Other aspects of the first embodiment) 5 and 6 are system diagrams schematically showing other forms of the power generation equipment 1 of the first embodiment. In the other forms shown in Fig. 5 and 6, the system to which the steam generated in the heat storage / steam generation device 60 is supplied in the steam generation mode operation is different.

[0092] Here, the configuration for exerting the steam generation function in another embodiment shown in Fig. 5 is referred to as a second steam generation structure. Operation in the second steam generation structure is referred to as a second steam generation mode operation. Also, the configuration for exerting the steam generation function in another embodiment shown in Fig. 6 is referred to as a third steam generation structure. Operation in the third steam generation structure is referred to as a third steam generation mode operation.

[0093] The second steam generating structure and the third steam generating structure each include a heat storage steam generating device 60 , a steam generating water supply pipe 63 , a steam supply pipe 64 , and a heat storage material water supply pipe 65 .

[0094] As shown in FIG. 5, in the second steam generating configuration, one end of the steam supply pipe 64 is connected to the steam inlet of the feedwater pump driven turbine 50 .

[0095] During operation in the second steam generation mode, steam generated in the heat storage / steam generation device 60 is supplied to the feedwater pump drive turbine 50 via the steam supply pipe 64. At this time, the flow rate control valve 51a of the steam supply pipe 51 is closed. Therefore, steam discharged from the intermediate-pressure turbine 22 is introduced into the low-pressure turbine 23 via the crossover pipe 43.

[0096] Therefore, the steam that was supplied to the feedwater pump drive turbine 50 is introduced into the low-pressure turbine 23, thereby increasing the turbine output. As a result, in the other configurations shown in Fig. 5 as well, the required load can be reached in a short time, and excellent responsiveness to load increases can be obtained, similar to the power generation facility 1 of the first embodiment shown in Fig. 2.

[0097] 6, in the third steam generating structure, one end of a steam supply pipe 64 is connected to the steam extraction pipe 45A. The one end of the steam supply pipe 64 is connected to the feedwater heater 28A side of the position where the flow rate adjustment valve 80 is located.

[0098] During operation in the third steam generation mode, the steam generated in the thermal storage / steam generation device 60 is supplied to the extraction pipe 45A via the steam supply pipe 64. At this time, the flow rate control valve 80 is closed. The amount of extracted steam from the low-pressure turbine 23 is the same as the amount of steam supplied to the thermal storage / steam generation device 60 via the thermal storage material water supply pipe 65. Therefore, the amount of extracted steam from the low-pressure turbine 23 decreases, and the turbine output increases. As a result, in the other configurations shown in FIG. 6 as well, the required load can be reached in a short time, and excellent responsiveness to load increases can be obtained, similar to the power generation facility 1 of the first embodiment shown in FIG. 2.

[0099] (Second embodiment) 7 is a system diagram schematically illustrating the configuration of the power generation facility 2 according to the second embodiment. In the following embodiments, the same components as those in the power generation facility 1 according to the first embodiment are denoted by the same reference numerals, and redundant explanations will be omitted or simplified.

[0100] The configuration of the power generation facility 2 of the second embodiment is the same as the configuration of the power generation facility 1 of the first embodiment shown in Fig. 2, except for the connection configuration of the heat storage steam discharge pipe 62. Therefore, here, the configuration that differs from the configuration of the power generation facility 1 of the first embodiment will be mainly described. Note that the configuration of the steam generation function in the power generation facility 2 of the second embodiment shown in Fig. 7 is the first steam generation structure described above.

[0101] Here, the configuration for exhibiting the heat storage function in the power generation facility 2 of the second embodiment shown in Fig. 7 is referred to as a second heat storage structure. Operation in the second heat storage structure is referred to as a second heat storage mode operation.

[0102] The second heat storage structure includes a heat storage steam generation device 60 , a heat storage steam supply pipe 61 , a heat storage steam discharge pipe 62 , and a drain pipe 66 .

[0103] 7, in the second heat storage structure, one end of the heat storage steam discharge pipe 62 is connected to the air bleed pipe 45C. Note that, although an example in which one end of the heat storage steam discharge pipe 62 is connected to the air bleed pipe 45C is shown here, the one end of the heat storage steam discharge pipe 62 may also be connected to, for example, another air bleed pipe 45B, 45D, 45A. For example, the air bleed pipe 45B, 45C, 45D, 45A to which the one end of the heat storage steam discharge pipe 62 is connected may be set based on the temperature of the steam supplied from the heat storage steam discharge pipe 62.

[0104] During second heat storage mode operation, surplus steam is supplied from the main steam pipe 40 to the heat storage / steam generation device 60 via the heat storage steam supply pipe 61. Then, the surplus steam that has given heat to the chemical heat storage material 72 by the above-mentioned action is introduced into the extraction pipe 45C via the heat storage steam discharge pipe 62. This increases the temperature of the feedwater, improving the cycle thermal efficiency during second heat storage mode operation. The energy of the surplus steam supplied to the heat storage / steam generation device 60 via the heat storage steam supply pipe 61 functions as surplus energy generated in its own system.

[0105] Furthermore, since the power generation facility 2 includes the first steam generating structure, the power generation facility 2 can achieve the same effects as those achieved by including the first steam generating structure described above.

[0106] According to the power generation facility 2 of the second embodiment, by including the heat storage / steam generation device 60, it is possible to obtain the same effects as those of the power generation facility 1 of the first embodiment. That is, in the power generation facility 2 of the second embodiment, it is possible to reach the requested load in a short time, and excellent responsiveness to load increase is obtained.

[0107] Here, the power generation facility 2 of the second embodiment may be configured without including the intermediate-pressure turbine 22. Fig. 8 is a system diagram schematically showing the configuration of the power generation facility 2 of the second embodiment without including the intermediate-pressure turbine 22.

[0108] 8 does not include the intermediate-pressure turbine 22, and therefore does not include the reheat boiler 12, the low-temperature reheat steam pipe 41, or the high-temperature reheat steam pipe 42. The outlet of the high-pressure turbine 21 is connected to the inlet of the low-pressure turbine 23 via a crossover pipe 43.

[0109] The high-pressure turbine 21 and the low-pressure turbine 23 may be provided in an integrated casing. In this case, steam discharged from the high-pressure turbine 21 is introduced into the low-pressure turbine 23 without passing through the crossover pipe 43. Steam supplied via the steam supply pipe 64 is supplied to the first stage stator vanes of the low-pressure turbine 23 or to an upstream turbine stage.

[0110] A portion of the steam discharged from the high-pressure turbine 21 is introduced into the feedwater pump drive turbine 50 via a steam supply pipe 51. In addition, extracted steam from a predetermined turbine stage of the high-pressure turbine 21 is introduced into the deaerator 29 via an extraction pipe 45D.

[0111] During the first steam generation mode operation, the superheated steam generated in the thermal storage / steam generation device 60 is supplied to the crossover pipe 43 via the steam supply pipe 64 .

[0112] The power generation facility 2 shown in FIG. 8 also provides the same effects as those of the power generation facility 2 shown in FIG.

[0113] (Other aspects of the second embodiment) 9 and 10 are system diagrams schematically showing other configurations of the power generation facility 2 of the second embodiment. In the other configurations shown in Fig. 9 and 10, the system to which the steam generated in the heat storage / steam generation device 60 is supplied in the steam generation mode operation is different.

[0114] The steam generation function in the other embodiment shown in Figure 9 is configured as the second steam generation structure described above, and operates in the second steam generation mode. Therefore, the same effects as those obtained by providing the second steam generation structure described above can be obtained. That is, in the other embodiment shown in Figure 9, the required load can be reached in a short time, and excellent responsiveness to load increases can be obtained.

[0115] The steam generation function in the other embodiment shown in Figure 10 is configured as the third steam generation structure described above, and operates in the third steam generation mode. Therefore, the same effects as those obtained by providing the third steam generation structure described above can be obtained. That is, in the other embodiment shown in Figure 10, the required load can be reached in a short time, and excellent responsiveness to load increases can be obtained.

[0116] (Third embodiment) Fig. 11 is a system diagram schematically showing the configuration of the power generation facility 3 according to the third embodiment. The configuration of the power generation facility 3 according to the third embodiment is the same as the configuration of the power generation facility 1 according to the first embodiment shown in Fig. 2, except for the connection configuration of the heat storage steam supply pipe 61 and the heat storage steam discharge pipe 62.

[0117] Therefore, the following mainly describes the configuration that is different from the configuration of the power generation facility 1 of the first embodiment. Note that the configuration of the steam generation function in the power generation facility 3 of the third embodiment shown in Fig. 11 is the first steam generation structure described above.

[0118] Here, the configuration for exhibiting the heat storage function in the power generation facility 3 of the third embodiment shown in Fig. 11 is referred to as a third heat storage structure. Operation in the third heat storage structure is referred to as a third heat storage mode operation.

[0119] The third heat storage structure includes a heat storage steam generation device 60 , a heat storage steam supply pipe 61 , a heat storage steam discharge pipe 62 , and a drain pipe 66 .

[0120] 11, in the third heat storage structure, one end of a heat storage steam supply pipe 61 is connected to the high-temperature reheat steam pipe 42 between the reheat boiler 12 and the pressure / flow control valve 42a. One end of a heat storage steam discharge pipe 62 is connected to the condenser 25.

[0121] During the third heat storage mode operation, surplus steam is supplied from the high-temperature reheat steam pipe 42 to the heat storage / steam generation device 60 via the heat storage steam supply pipe 61. Then, the surplus steam that has given heat to the chemical heat storage material 72 by the above-mentioned action is introduced into the condenser 25 via the heat storage steam discharge pipe 62. The energy of the surplus steam supplied to the heat storage / steam generation device 60 via the heat storage steam supply pipe 61 functions as surplus energy generated in its own system.

[0122] Furthermore, since the power generation facility 3 includes the first steam generating structure, the power generation facility 3 can achieve the same effects as those achieved by including the first steam generating structure described above.

[0123] According to the power generation facility 3 of the third embodiment, by including the heat storage / steam generation device 60, it is possible to obtain the same effects as those of the power generation facility 1 of the first embodiment. That is, in the power generation facility 3 of the third embodiment, it is possible to reach the requested load in a short time, and excellent responsiveness to load increase is obtained.

[0124] (Other aspects of the third embodiment) 12 and 13 are system diagrams schematically showing other configurations of the power generation facility 3 of the third embodiment. In the other configurations shown in Fig. 12 and 13, the system to which the steam generated in the heat storage / steam generation device 60 is supplied in the steam generation mode operation is different.

[0125] The steam generation function in the other embodiment shown in Figure 12 is configured as the second steam generation structure described above, and operates in the second steam generation mode. Therefore, the same effects as those obtained by providing the second steam generation structure described above can be obtained. That is, in the other embodiment shown in Figure 12, the required load can be reached in a short time, and excellent responsiveness to load increases can be obtained.

[0126] The steam generation function in the other embodiment shown in Figure 13 is configured as the third steam generation structure described above, and operates in the third steam generation mode. Therefore, the same effects as those obtained by providing the third steam generation structure described above can be obtained. That is, in the other embodiment shown in Figure 13, the required load can be reached in a short time, and excellent responsiveness to load increases can be obtained.

[0127] (Fourth embodiment) Fig. 14 is a system diagram schematically showing the configuration of the power generation facility 4 according to the fourth embodiment. The configuration of the power generation facility 4 according to the fourth embodiment is the same as the configuration of the power generation facility 1 according to the first embodiment shown in Fig. 2, except for the connection configuration of the heat storage steam supply pipe 61 and the heat storage steam discharge pipe 62.

[0128] Therefore, the following mainly describes the configuration that differs from the configuration of the power generation facility 1 of the first embodiment. Note that the configuration of the steam generation function in the power generation facility 4 of the fourth embodiment shown in Fig. 14 is the first steam generation structure described above.

[0129] Here, the configuration for exhibiting the heat storage function in the power generation facility 4 of the fourth embodiment shown in Fig. 14 is referred to as a fourth heat storage structure. Operation in the fourth heat storage structure is referred to as a fourth heat storage mode operation.

[0130] The fourth heat storage structure includes a heat storage steam generation device 60 , a heat storage steam supply pipe 61 , a heat storage steam discharge pipe 62 , and a drain pipe 66 .

[0131] 14 , in the fourth thermal storage structure, one end of a thermal storage steam supply pipe 61 is connected to the high-temperature reheat steam pipe 42 between the reheat boiler 12 and the pressure / flow control valve 42a. One end of a thermal storage steam discharge pipe 62 is connected to a steam extraction pipe 45C. Note that, although an example in which one end of the thermal storage steam discharge pipe 62 is connected to the steam extraction pipe 45C is shown here, one end of the thermal storage steam discharge pipe 62 may be connected to, for example, another steam extraction pipe 45B, 45D, or 45A. For example, the steam extraction pipe 45B, 45C, 45D, or 45A to which one end of the thermal storage steam discharge pipe 62 is connected may be determined based on the temperature of the steam supplied from the thermal storage steam discharge pipe 62.

[0132] During fourth heat storage mode operation, surplus steam is supplied from the high-temperature reheat steam pipe 42 to the heat storage / steam generator 60 via the heat storage steam supply pipe 61. Then, the surplus steam that has given heat to the chemical heat storage material 72 through the above-mentioned action is introduced into the extraction pipe 45C via the heat storage steam discharge pipe 62. This increases the temperature of the feedwater, improving the cycle thermal efficiency during fourth heat storage mode operation. The energy of the surplus steam supplied to the heat storage / steam generator 60 via the heat storage steam supply pipe 61 functions as surplus energy generated in its own system.

[0133] Furthermore, since the power generation facility 4 includes the first steam generating structure, the power generation facility 4 can achieve the same effects as those achieved by including the first steam generating structure described above.

[0134] According to the power generation facility 3 of the fourth embodiment, by including the heat storage / steam generation device 60, it is possible to obtain the same effects as those of the power generation facility 1 of the first embodiment. That is, in the power generation facility 4 of the fourth embodiment, it is possible to reach the requested load in a short time, and excellent responsiveness to load increase is obtained.

[0135] (Other aspects of the fourth embodiment) 15 and 16 are system diagrams schematically showing other configurations of the power generation equipment 4 of the fourth embodiment. In the other configurations shown in Fig. 15 and 16, the system to which the steam generated in the heat storage / steam generation device 60 is supplied in the steam generation mode operation is different.

[0136] The steam generation function in the other embodiment shown in Figure 15 is configured as the second steam generation structure described above, and operates in the second steam generation mode. Therefore, the same effects as those obtained by providing the second steam generation structure described above can be obtained. That is, in the other embodiment shown in Figure 15, the required load can be reached in a short time, and excellent responsiveness to load increases can be obtained.

[0137] The steam generation function in the other embodiment shown in Figure 16 is configured as the third steam generation structure described above, and operates in the third steam generation mode. Therefore, the same effects as those obtained by providing the third steam generation structure described above can be obtained. That is, in the other embodiment shown in Figure 16, the required load can be reached in a short time, and excellent responsiveness to load increases can be obtained.

[0138] (Fifth embodiment) Fig. 17 is a system diagram schematically showing the configuration of the power generation facility 5 according to the fifth embodiment. Fig. 18 is a diagram schematically showing the internal configuration of the heat storage / steam generation device 60A in the power generation facility 5 according to the fifth embodiment.

[0139] The configuration of the power generation facility 5 of the fifth embodiment is the same as the configuration of the power generation facility 1 of the first embodiment shown in Fig. 2, except for the connection configuration of the heat storage / steam generation device 60A and the heat storage steam discharge pipe 62. Therefore, here, the configuration that differs from the configuration of the power generation facility 1 of the first embodiment will be mainly described.

[0140] Here, the configuration for exerting the heat storage function in the power generation equipment 5 of the fifth embodiment shown in Fig. 17 is referred to as a fifth heat storage structure, and the configuration for exerting the steam generation function is referred to as a fourth steam generation structure. Also, operation in the fifth heat storage structure is referred to as a fifth heat storage mode operation, and operation in the fourth steam generation structure is referred to as a fourth steam generation mode operation.

[0141] The fifth heat storage structure includes a heat storage / steam generation device 60A, a heat storage steam supply pipe 61, a heat storage steam discharge pipe 62, and a drain pipe 66. The fourth steam generation structure includes a heat storage / steam generation device 60A, a steam generation water supply pipe 63, a steam supply pipe 64, and a heat storage material water supply pipe 65.

[0142] 17, in the fifth heat storage structure, one end of the heat storage steam discharge pipe 62 is connected to the condenser 25. Also, in the fourth steam generation structure, an example is shown in which one end of the steam generation feedwater supply pipe 63 is connected to the feedwater pipe 26 between the feedwater pump 27A and the feedwater heater 28A.

[0143] 18, the heat storage / steam generation device 60A includes an apparatus container 90, a heat storage / steam generation unit 91 including a chemical heat storage material, and a heat storage / steam generation unit 92 including a latent heat storage material or a sensible heat storage material. The configuration of the heat storage / steam generation unit 91 including the chemical heat storage material is the same as the configuration inside the internal container 71 of the heat storage / steam generation device 60 described with reference to FIG.

[0144] The device container 90 is formed of a housing and houses a heat storage / steam generating unit 91 and a heat storage / steam generating unit 92 .

[0145] The heat storage / steam generation unit 92 includes an internal container 93 filled with a latent heat storage material or a sensible heat storage material. A latent heat storage material is a heat storage material that stores heat by utilizing a phase change of a substance. The latent heat storage material is formed, for example, by filling a latent heat storage substance into an outer shell (shell) or container made of resin or the like. In this case, the latent heat storage material exchanges heat with a fluid that flows through the gaps between the latent heat storage material.

[0146] Here, the heat storage / steam generation unit 92 is supplied with surplus steam after heat has been imparted in the heat storage / steam generation unit 91. Therefore, the temperature of the surplus steam supplied to the heat storage / steam generation unit 92 is lower than the temperature of the surplus steam supplied to the heat storage / steam generation unit 91.

[0147] The latent heat storage material is a material that changes phase within a predetermined temperature range (for example, 250 to 350° C.) Examples of latent heat storage materials include alloy PCM (Phase Change Material), molten salt, water, polyethylene, sugar alcohols such as erythritol and mannitol, and paraffin.

[0148] The sensible heat storage material is a heat storage material that stores heat due to temperature changes of a substance. Examples of sensible heat storage materials include rock, concrete, and ceramics. The sensible heat storage material filled in the inner container 93 exchanges heat with the fluid that flows through the gaps between the sensible heat storage materials.

[0149] Here, in the heat storage / steam generation unit 91, one branch portion at one end of the heat exchange piping 73 is connected to the heat storage steam supply pipe 61, and the other branch portion is connected to the steam supply pipe 64. The other end of the heat exchange piping 73 is connected to a connecting pipe 94. This connecting pipe 94 connects the heat storage / steam generation unit 91 and the heat storage / steam generation unit 92. In addition, the connecting pipe 94 is in communication with the inside of the internal container 93.

[0150] Furthermore, in the heat storage / steam generation unit 92, a pipe 95 is provided on the side opposite to the side connected to the connecting pipe 94. The other end of this pipe 95 branches into two. One branch is connected to the heat storage steam discharge pipe 62, and the other branch is connected to the steam generation feedwater supply pipe 63.

[0151] In this way, the heat storage / steam generation unit 91 is located on the side of the heat storage steam supply pipe 61 that supplies high-temperature steam during fifth heat storage mode operation, and on the side of the steam supply pipe 64 that supplies generated steam during fourth steam generation mode operation. On the other hand, the heat storage / steam generation unit 92 is located on the side of the heat storage steam discharge pipe 62 that discharges surplus steam that has given heat to the chemical heat storage material 72 during fifth heat storage mode operation, and on the side of the steam generation feedwater supply pipe 63 that supplies feedwater for generating steam during fourth steam generation mode operation.

[0152] Although an example in which the heat storage / steam generating unit 91 and the heat storage / steam generating unit 92 are provided in a single container, that is, the device container 90, is shown here, the present invention is not limited to this configuration. The heat storage / steam generating unit 91 and the heat storage / steam generating unit 92 may not be arranged in a single container, but may be arranged independently. Even in this case, the heat storage / steam generating unit 91 and the heat storage / steam generating unit 92 are connected by the connecting pipe 94, as described above.

[0153] (Operation of the heat storage / steam generating device 60A: During fifth heat storage mode operation) Next, the operation of the heat storage / steam generation device 60A in the fifth heat storage mode operation will be described with reference to Figures 17 and 18. As described above, in the fifth heat storage mode operation, surplus energy is stored in the heat storage / steam generation device 60A.

[0154] During fifth heat storage mode operation, surplus steam generated in the boiler 11 is introduced from the main steam pipe 40 through the heat storage steam supply pipe 61 into the heat exchange pipe 73 of the heat storage / steam generation unit 91. The energy of the surplus steam supplied to the heat storage / steam generation device 60A through the heat storage steam supply pipe 61 functions as surplus energy generated in its own system. As described with reference to FIG. 3 , the surplus steam introduced into the heat exchange pipe 73 heats the chemical heat storage material 72. The chemical heat storage material 72 stores heat through a dehydration reaction. Water generated by the dehydration reaction is discharged to the condenser 25 through the drain pipe 66.

[0155] Then, the surplus steam that has given heat to the chemical heat storage material 72 is introduced into the inner container 93 of the heat storage / steam generation unit 92 via the connecting pipe 94. The surplus steam introduced into the inner container 93 gives heat to the latent heat storage material or the sensible heat storage material. As a result, the latent heat storage material or the sensible heat storage material stores heat.

[0156] The surplus steam that has given heat to the latent heat storage material or the sensible heat storage material is introduced into the condenser 25 via the heat storage steam discharge pipe 62 .

[0157] (Function of the heat storage / steam generation device 60A: During operation in the fourth steam generation mode) Next, the operation of the heat storage / steam generation device 60A during operation in the fourth steam generation mode will be described with reference to FIGS.

[0158] As mentioned above, in the evening when the supply of renewable energy decreases, an increase in load is required for the steam power plant. In the steam generation mode operation, when an increase in load is required, the stored heat is used to generate steam for use in the own system.

[0159] During operation in the fourth steam generation mode, the feedwater supplied from the steam generation feedwater supply pipe 63 to the heat storage / steam generation unit 92 via the pipe 95 is heated by the heat stored in the latent heat storage material or the sensible heat storage material. The heated feedwater is supplied in the form of steam or water to the heat exchange pipe 73 via the connecting pipe 94.

[0160] Here, the extracted air from the air extraction pipe 45A is supplied to the chemical thermal storage medium 72 via the thermal storage medium water supply pipe 65. As described with reference to Fig. 3, the chemical thermal storage medium 72 releases heat through a hydration reaction.

[0161] The steam or water supplied to the heat exchange pipe 73 is heated by heat radiation from the chemical thermal storage medium 72 and becomes superheated steam. The steam generated in the thermal storage / steam generation unit 91 is supplied to, for example, the crossover pipe 43 via the steam supply pipe 64. The steam supplied to the crossover pipe 43 is introduced into the low-pressure turbine 23 together with steam discharged from the intermediate-pressure turbine 22. This increases the amount of steam introduced into the low-pressure turbine 23, and increases the turbine output.

[0162] According to the power generation facility 5 of the fifth embodiment, by including the heat storage / steam generation device 60A, it is possible to obtain the same effects as those of the power generation facility 1 of the first embodiment. That is, in the power generation facility 5 of the fifth embodiment, it is possible to reach the requested load in a short time, and excellent responsiveness to load increase is obtained.

[0163] By providing a latent heat storage material or a sensible heat storage material in addition to the chemical heat storage material 72, during operation in the fifth heat storage mode, it is possible to store, in the latent heat storage material or the sensible heat storage material, the amount of heat possessed by the excess steam that has given the amount of heat to the chemical heat storage material 72. This makes it possible to effectively store the amount of heat possessed by the excess steam.

[0164] Furthermore, during operation in the fourth steam generation mode, the amount of steam generated can be increased by heating the feedwater using the heat stored in the latent heat storage material or the sensible heat storage material, and then heating it using the heat stored in the chemical thermal storage material 72. Furthermore, during operation in the fourth steam generation mode, the amount of extracted steam supplied to heat the low-temperature feedwater by the feedwater heater 28A or the like can be reduced by heating the low-temperature feedwater supplied through the steam generation feedwater supply pipe 63 using the heat stored in the latent heat storage material or the sensible heat storage material. An example of the low-temperature feedwater is feedwater supplied from the feedwater pipe 26 between the feedwater pump 27A and the feedwater heater 28A. This reduces the amount of extracted steam from the low-pressure turbine 23, improving responsiveness to load increases, for example.

[0165] Here, the power generation facility 5 of the fifth embodiment may be configured without the intermediate-pressure turbine 22. As described with reference to Fig. 8, a configuration without the intermediate-pressure turbine 22 is a configuration in which the intermediate-pressure turbine 22, the reheat boiler 12, the low-temperature reheat steam pipe 41, and the high-temperature reheat steam pipe 42 are removed from the configuration shown in Fig. 17. In this case, the same effects as those of the power generation facility 5 shown in Fig. 17 can be obtained.

[0166] (Other aspects of the fifth embodiment) 19 and 20 are system diagrams schematically showing other forms of the power generation equipment 5 of the fifth embodiment. In the other forms shown in Fig. 19 and 20, the system to which the steam generated in the heat storage / steam generation device 60A is supplied in the steam generation mode operation is different.

[0167] Here, the configuration for exerting the steam generation function in another embodiment shown in Fig. 19 is referred to as a fifth steam generation structure. Operation in the fifth steam generation structure is referred to as a fifth steam generation mode operation. Furthermore, the configuration for exerting the steam generation function in another embodiment shown in Fig. 20 is referred to as a sixth steam generation structure. Operation in the sixth steam generation structure is referred to as a sixth steam generation mode operation.

[0168] The fifth and sixth steam generating structures each include a heat storage / steam generating device 60A, a steam generating water supply pipe 63, a steam supply pipe 64, and a heat storage material water supply pipe 65.

[0169] During the fifth steam generation mode operation and the sixth steam generation mode operation, the action of generating superheated steam from feedwater is the same as the action during the fourth steam generation mode operation described above.

[0170] As shown in Fig. 19, in the fifth steam generation structure, one end of a steam supply pipe 64 is connected to the steam inlet of the feedwater pump driven turbine 50. During operation in the fifth steam generation mode, superheated steam generated in the thermal storage / steam generation device 60A is supplied to the feedwater pump driven turbine 50 via the steam supply pipe 64. At this time, the flow rate adjustment valve 51a of the steam supply pipe 51 is closed. Therefore, steam discharged from the intermediate-pressure turbine 22 is introduced into the low-pressure turbine 23 via the crossover pipe 43.

[0171] In this way, the steam that was previously supplied to the feedwater pump drive turbine 50 is introduced into the low-pressure turbine 23, thereby increasing the turbine output. As a result, even in the other configurations shown in Fig. 19, the required load can be reached in a short time, and excellent responsiveness to load increases can be obtained.

[0172] 20, in the sixth steam generating structure, one end of a steam supply pipe 64 is connected to the steam extraction pipe 45A. The one end of the steam supply pipe 64 is connected to the feedwater heater 28A side of the position where the flow rate adjustment valve 80 is located.

[0173] During operation in the sixth steam generation mode, the superheated steam generated in the thermal storage / steam generation unit 60A is supplied to the extraction pipe 45A via the steam supply pipe 64. At this time, the flow control valve 80 is closed. The amount of extracted steam from the low-pressure turbine 23 becomes the amount of steam supplied to the thermal storage / steam generation unit 60A via the thermal storage material water supply pipe 65. Therefore, the amount of extracted steam from the low-pressure turbine 23 decreases, and the turbine output increases. As a result, even in the other configurations shown in FIG. 20, the required load can be reached in a short time, and excellent responsiveness to load increases can be obtained.

[0174] (Sixth embodiment) Fig. 21 is a system diagram that schematically shows the configuration of the power generation facility 6 of the sixth embodiment. The configuration of the power generation facility 2 of the second embodiment is the same as the configuration of the power generation facility 5 of the fifth embodiment shown in Fig. 17, except for the connection configuration of the heat storage steam supply pipe 61. Therefore, here, the configuration that differs from the configuration of the power generation facility 5 of the fifth embodiment will be mainly described.

[0175] The configuration of the steam generating function in the power generation facility 5 of the fifth embodiment shown in FIG. 21 is the fourth steam generating structure described above.

[0176] Here, the configuration for exhibiting the heat storage function in the power generation facility 6 of the sixth embodiment shown in Fig. 21 is referred to as a sixth heat storage structure. Operation in the sixth heat storage structure is referred to as a sixth heat storage mode operation.

[0177] The sixth heat storage structure includes a heat storage steam generation device 60 A, a heat storage steam supply pipe 61 , a heat storage steam discharge pipe 62 , and a drain pipe 66 .

[0178] As shown in FIG. 21, in the sixth heat storage structure, one end of a heat storage steam supply pipe 61 is connected to the high-temperature reheat steam pipe 42 between the reheat boiler 12 and the pressure / flow rate control valve 42a.

[0179] During the sixth heat storage mode operation, excess steam is supplied from the high-temperature reheat steam pipe 42 to the heat storage / steam generation device 60A via the heat storage steam supply pipe 61. Then, the excess steam that has provided heat to the heat storage / steam generation unit 91 and the heat storage / steam generation unit 92 through the above-mentioned action is introduced into the condenser 25 via the heat storage steam discharge pipe 62. The energy of the excess steam supplied to the heat storage / steam generation device 60A via the heat storage steam supply pipe 61 functions as excess energy generated in its own system.

[0180] Furthermore, since the power generation facility 6 is provided with the fourth steam generating structure, the power generation facility 6 can obtain the same effects as those obtained by providing the fourth steam generating structure described in the fifth embodiment.

[0181] According to the power generation facility 6 of the sixth embodiment, by including the heat storage / steam generation device 60A, it is possible to obtain the same effects as those of the power generation facility 5 of the fifth embodiment. That is, in the power generation facility 6 of the sixth embodiment, it is possible to reach the requested load in a short time, and excellent responsiveness to load increase is obtained.

[0182] Furthermore, by providing the heat storage / steam generation device 60A with a latent heat storage material or a sensible heat storage material in addition to the chemical heat storage material 72, during operation in the sixth heat storage mode, it is possible to store, in the latent heat storage material or the sensible heat storage material, the heat quantity possessed by the excess steam that has given the heat quantity to the chemical heat storage material 72. This makes it possible to effectively store the heat quantity possessed by the excess steam.

[0183] (Other aspects of the sixth embodiment) 22 and 23 are system diagrams schematically showing other forms of the power generation equipment 6 of the sixth embodiment. In the other forms shown in Fig. 22 and 23, the system to which the steam generated in the heat storage / steam generation device 60A is supplied in the steam generation mode operation is different.

[0184] The steam generation function in the other embodiment shown in Fig. 22 is configured as the fifth steam generation structure described above, and operates in the fifth steam generation mode. Therefore, the same effects as those obtained by providing the fifth steam generation structure described above can be obtained. That is, in the other embodiment shown in Fig. 22, the required load can be reached in a short time, and excellent responsiveness to load increases can be obtained.

[0185] The steam generation function in the other embodiment shown in Fig. 23 is configured as the sixth steam generation structure described above, and operates in the sixth steam generation mode. Therefore, the same effects as those obtained by providing the sixth steam generation structure described above can be obtained. That is, in the other embodiment shown in Fig. 23, the required load can be reached in a short time, and excellent responsiveness to load increases can be obtained.

[0186] (Seventh embodiment) Fig. 24 is a system diagram schematically showing the configuration of the power generation facility 7 of the seventh embodiment. Fig. 25 is a diagram schematically showing the internal configuration of the heat storage / steam generation device 60B in the power generation facility 7 of the seventh embodiment.

[0187] The configuration of the power generation facility 7 of the seventh embodiment is the same as the configuration of the power generation facility 1 of the first embodiment shown in Fig. 2, except for the heat storage / steam generation device 60B, the seventh heat storage structure, and the seventh steam generation structure. Therefore, here, the configuration that differs from the configuration of the power generation facility 1 of the first embodiment will be mainly described.

[0188] The heat storage / steam generation device 60B in the seventh embodiment has a heat storage function that uses surplus energy generated in its own system to store heat, and a steam generation function that receives a portion of the feed water introduced through the water supply pipe 26 and turns the feed water into steam using the stored heat. The heat storage / steam generation device 60B uses surplus electricity as surplus energy generated in its own system.

[0189] This surplus power is generated by introducing surplus steam generated in the boiler 11 into the steam turbine system 20. In other words, the surplus power is power equivalent to the surplus steam generated in the generator 24 by introducing the surplus steam into the steam turbine system 20.

[0190] Here, the configuration for exerting the heat storage function in the power generation equipment 7 of the seventh embodiment shown in Fig. 24 is referred to as a seventh heat storage structure, and the configuration for exerting the steam generation function is referred to as a seventh steam generation structure. Also, operation in the seventh heat storage structure is referred to as a seventh heat storage mode operation, and operation in the seventh steam generation structure is referred to as a seventh steam generation mode operation.

[0191] The seventh heat storage structure includes a heat storage / steam generation device 60B, an electric power supply line 100, and a drain pipe 66. The seventh steam generation structure includes a heat storage / steam generation device 60B, a steam generation water supply pipe 63, a steam supply pipe 64, and a heat storage material water supply pipe 65.

[0192] As shown in Fig. 24, in the seventh heat storage structure, a thermoelectric converter is used as a heat source for heat storage. Therefore, a system for supplying steam for heat storage to the heat storage / steam generation device 60B and a system for discharging steam for heat storage from the heat storage / steam generation device 60B are not provided. As a result, steam including excess steam flowing through the main steam pipe 40 is introduced into the high-pressure turbine 21 without being supplied to the heat storage / steam generation device 60B. Furthermore, steam including excess steam flowing through the high-temperature reheat steam pipe 42 is introduced into the intermediate-pressure turbine 22 without being supplied to the heat storage / steam generation device 60B.

[0193] As shown in Fig. 25, the heat storage / steam generation device 60B includes an equipment container 70, an inner container 71, a chemical heat storage material 72, heat exchange piping 73, and a thermoelectric converter 75. In Fig. 25, the same components as those in the heat storage / steam generation device 60 shown in Fig. 3 are denoted by the same reference numerals, and duplicated explanations will be omitted or simplified. In Fig. 25, the thermoelectric converter 75 is indicated by a dashed line to distinguish it from the heat exchange piping 73.

[0194] The thermoelectric converter 75 is arranged in a serpentine manner inside the internal container 71. That is, like the heat exchange piping 73, the thermoelectric converter 75 is arranged in a serpentine manner between the chemical heat storage materials 72 while being in contact with the chemical heat storage materials 72. It is preferable that the thermoelectric converter 75 is arranged so as not to come into contact with the outer surface of the heat exchange piping 73.

[0195] The thermoelectric converter 75 generates heat using electric power. The thermoelectric converter 75 is configured, for example, by an electric heater. Both ends of the thermoelectric converter 75 function as terminals to which electric power is supplied. Both ends of the thermoelectric converter 75 protrude, for example, to the outside of the inner container 71 and the device container 70 so that electric power can be supplied. Furthermore, both ends of the thermoelectric converter 75 are connected to the generator 24 via a power supply line 100. Then, surplus electric power generated by the generator 24 is supplied to both ends of the thermoelectric converter 75. Note that in FIG. 24 , the power supply line 100 is indicated by a dashed line.

[0196] Since the heat storage / steam generation device 60B does not have a system for supplying steam for heat storage or a system for discharging steam for heat storage, one end of the heat exchange piping 73 is connected to the steam generation feedwater supply pipe 63, and the other end of the heat exchange piping 73 is connected to the steam supply pipe 64.

[0197] (Operation of the heat storage / steam generating device 60B: during seventh heat storage mode operation) Next, the operation of the heat storage / steam generation device 60B in the seventh heat storage mode operation will be described with reference to Figures 24 and 25. In the seventh heat storage mode operation, surplus energy is stored in the heat storage / steam generation device 60B.

[0198] During the seventh heat storage mode operation, the flow rate adjustment valve 63a of the steam generation water supply pipe 63 and the flow rate adjustment valve 64a of the steam supply pipe 64 are closed. The flow rate adjustment valve 65a of the heat storage material water supply pipe 65 is closed, and the flow rate adjustment valve 66a of the drain pipe 66 is opened.

[0199] Surplus power generated by the generator 24 is supplied to the thermoelectric converter 75 via a power supply line 100. The thermoelectric converter 75 generates heat using the supplied power. The chemical heat storage material 72 is heated by this generated heat. The chemical heat storage material 72 then stores heat through a dehydration reaction. Water produced by the dehydration reaction is discharged to the condenser 25 via a drain pipe 66.

[0200] (Function of the heat storage / steam generation device 60B: during operation in the seventh steam generation mode) Next, the operation of the heat storage / steam generation device 60B in the seventh steam generation mode operation will be described with reference to FIGS.

[0201] As mentioned above, in the evening when the supply of renewable energy decreases, an increase in load is required for the steam power plant. In the steam generation mode operation, when an increase in load is required, the stored heat is used to generate steam for use in the own system.

[0202] During operation in the seventh steam generation mode, the flow rate adjustment valve 63a of the steam generation water supply pipe 63 and the flow rate adjustment valve 64a of the steam supply pipe 64 are opened. The flow rate adjustment valve 65a of the heat storage material water supply pipe 65 is opened, and the flow rate adjustment valve 66a of the drain pipe 66 is closed.

[0203] The extracted air from the air extraction pipe 45A is supplied to the chemical thermal storage medium 72 via the thermal storage medium water supply pipe 65. As described above, the chemical thermal storage medium 72 releases heat through the hydration reaction.

[0204] The feedwater supplied to the heat exchange piping 73 via the steam generation feedwater supply pipe 63 is heated by the heat radiation from the chemical thermal storage medium 72, and becomes superheated steam. The steam generated in the thermal storage / steam generation device 60B is supplied to, for example, the crossover pipe 43 via a steam supply pipe 64. The steam supplied to the crossover pipe 43 is introduced into the low-pressure turbine 23 together with steam discharged from the intermediate-pressure turbine 22. This increases the amount of steam introduced into the low-pressure turbine 23, and increases the turbine output.

[0205] According to the power generation facility 7 of the seventh embodiment, by including the heat storage / steam generation device 60B having the thermoelectric conversion device 75, it is possible to utilize surplus power to store heat. Furthermore, by including the heat storage / steam generation device 60B in the power generation facility 7, it is possible to obtain the same effects as those of the power generation facility 1 of the first embodiment. That is, in the power generation facility 7 of the seventh embodiment, it is possible to reach the requested load in a short time, and excellent responsiveness to load increases is obtained.

[0206] Here, the power generation facility 7 of the seventh embodiment may be configured without the intermediate-pressure turbine 22. As explained with reference to Fig. 8, a configuration without the intermediate-pressure turbine 22 is a configuration in which the intermediate-pressure turbine 22, the reheat boiler 12, the low-temperature reheat steam pipe 41, and the high-temperature reheat steam pipe 42 are removed from the configuration shown in Fig. 24. In this case, the same effects as those of the power generation facility 5 shown in Fig. 24 can be obtained.

[0207] (Other aspects of the seventh embodiment) 26 and 27 are system diagrams schematically showing other forms of the power generation equipment 7 of the seventh embodiment. In the other forms shown in Fig. 26 and 27, the system to which the steam generated in the heat storage / steam generation device 60B is supplied in the steam generation mode operation is different.

[0208] Here, the configuration for exerting the steam generation function in another embodiment shown in Fig. 26 is referred to as an eighth steam generation structure. Operation in the eighth steam generation structure is referred to as an eighth steam generation mode operation. Furthermore, the configuration for exerting the steam generation function in another embodiment shown in Fig. 27 is referred to as a ninth steam generation structure. Operation in the ninth steam generation structure is referred to as a ninth steam generation mode operation.

[0209] The eighth and ninth steam generating structures each include a heat storage / steam generating device 60B, a steam generating water supply pipe 63, a steam supply pipe 64, and a heat storage material water supply pipe 65.

[0210] During the eighth steam generation mode operation and the ninth steam generation mode operation, the action of generating superheated steam from feedwater is the same as the action during the seventh steam generation mode operation described above.

[0211] As shown in Figure 26, in the eighth steam generation structure, one end of a steam supply pipe 64 is connected to the steam inlet of the feedwater pump driven turbine 50. During operation in the eighth steam generation mode, steam generated in the thermal storage / steam generation device 60B is supplied to the feedwater pump driven turbine 50 via the steam supply pipe 64. At this time, the flow rate adjustment valve 51a of the steam supply pipe 51 is closed. Therefore, steam discharged from the intermediate-pressure turbine 22 is introduced into the low-pressure turbine 23 via the crossover pipe 43.

[0212] In this way, the steam that was previously supplied to the feedwater pump drive turbine 50 is introduced into the low-pressure turbine 23, thereby increasing the turbine output. As a result, even in the other configurations shown in Fig. 26, the required load can be reached in a short time, and excellent responsiveness to load increases can be obtained.

[0213] 27, in the ninth steam generating structure, one end of a steam supply pipe 64 is connected to the steam extraction pipe 45A. The one end of the steam supply pipe 64 is connected to the feedwater heater 28A side of the position where the flow rate adjustment valve 80 is located.

[0214] During operation in the ninth steam generation mode, the steam generated in the thermal storage / steam generation unit 60B is supplied to the extraction pipe 45A via the steam supply pipe 64. At this time, the flow rate control valve 80 is closed. The amount of extracted steam from the low-pressure turbine 23 is the amount of steam supplied to the thermal storage / steam generation unit 60A via the thermal storage material water supply pipe 65. Therefore, the amount of extracted steam from the low-pressure turbine 23 decreases, and the turbine output increases. As a result, even in the other configurations shown in FIG. 27, the required load can be reached in a short time, and excellent responsiveness to load increases can be obtained.

[0215] (Other embodiments) The configuration of the embodiment including the above-described heat storage / steam generation devices 60, 60A, and 60B may be applied to, for example, a gas turbine combined cycle power generation facility. The gas turbine combined cycle power generation facility includes a heat recovery steam generator (HRSG) that generates steam by utilizing the heat of the exhaust gas from the gas turbine. The steam generated in the HRSG is introduced into the steam turbine. In this case, the boiler device 10 in the embodiment functions as the HRSG.

[0216] Superheated steam generated in the heat recovery boiler is introduced into the high-pressure turbine 21 via a main steam pipe 40. In addition, by providing a reheat section that reheats steam within the heat recovery boiler, the reheated steam is introduced into the intermediate-pressure turbine 22 via a high-temperature reheat steam pipe 42.

[0217] For example, a portion of the steam flowing through the main steam pipe 40 is supplied as steam for heat storage to the heat storage / steam generation devices 60, 60A via a heat storage steam supply pipe 61. Also, a portion of the steam flowing through the high-temperature reheat steam pipe 42 is supplied as steam for heat storage to the heat storage / steam generation devices 60, 60A via the heat storage steam supply pipe 61.

[0218] Gas turbine combined cycle power plants also have a minimum load constraint for continuous operation, which means that, like conventional steam power plants, excess steam is generated from the heat recovery boiler during the daytime when the supply of renewable energy increases.

[0219] Furthermore, when increasing the amount of steam generated in response to a demand for increased load, it takes a certain amount of time for the steam introduced into the steam turbine to reach the specified temperature and pressure, just as in conventional steam power generation facilities.

[0220] For this reason, by applying the configuration of the embodiment including the heat storage / steam generation devices 60, 60A, 60B to a gas turbine combined cycle power generation facility, the effects described in the above embodiment can be obtained. As a result, even in the gas turbine combined cycle power generation facility, the required load can be reached in a short time, and excellent responsiveness to load increases can be obtained.

[0221] According to the embodiment described above, it is possible to have excellent load responsiveness in response to a request for an increase in load.

[0222] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0223] 1, 2, 3, 4, 5, 6, 7...Power generation equipment, 10...Boiler equipment, 11...Boiler, 12...Reheat boiler, 20...Steam turbine system, 21...High pressure turbine, 22...Intermediate pressure turbine, 23...Low pressure turbine, 24...Generator, 25...Condenser, 26...Feed water pipe, 27A, 27B...Feed water pump, 28A, 28B, 28C...Feed water heater, 29...Deaerator, 40...Main steam pipe, 40a, 42a...Pressure / flow control valve, 51a, 61a, 62a, 63a, 64a, 65a, 66a, 80...Flow control valve, 41...Low temperature reheat steam pipe, 42...High temperature reheat steam pipe, 43...Crossover pipe , 44...exhaust pipe, 45A, 45B, 45C, 45D, 45E...extraction pipe, 46A, 46B, 46C...discharge pipe, 50...feedwater pump drive turbine, 51, 64...steam supply pipe, 60, 60A, 60B...thermal storage / steam generation device, 61...thermal storage steam supply pipe, 62...thermal storage steam discharge pipe, 63...steam generation feedwater supply pipe, 65...thermal storage material water supply pipe, 66...drain pipe, 70, 90...device container, 71, 93...inner container, 72...chemical thermal storage material, 73...heat exchange piping, 75...thermoelectric conversion device, 91, 92...thermal storage / steam generation section, 94...connecting pipe, 95...piping, 100...power supply line.

Claims

1. a boiler for generating steam; a first steam turbine into which steam generated in the boiler is introduced; a second steam turbine provided downstream of the first steam turbine in a flow direction of the steam flow; a condenser that condenses steam discharged from the second steam turbine; a feed water pipe that guides the condensed water condensed in the condenser to the boiler as feed water; a heat storage / steam generating device having a heat storage function for storing heat by utilizing surplus energy generated in its own system, and a steam generating function for converting the feed water into steam by the stored heat, to which a portion of the feed water guided by the water supply pipe is introduced; a steam supply pipe that supplies the steam generated by the heat storage / steam generation device to its own system; an extraction pipe provided at a predetermined turbine stage of the first steam turbine; a feedwater heater disposed in the feedwater pipe and configured to heat the feedwater using the extracted air introduced from the extracted air pipe; Equipped with the excess energy is energy of excess steam generated in the boiler, The heat storage / steam generation device stores the heat contained in the surplus steam, The power generation facility is characterized in that the surplus steam that has given heat to the heat storage / steam generation device is introduced into the steam extraction pipe.

2. A boiler for generating steam; a first steam turbine into which steam generated in the boiler is introduced; a second steam turbine provided downstream of the first steam turbine in a flow direction of the steam flow; a condenser that condenses steam discharged from the second steam turbine; a feed water pipe that guides the condensed water condensed in the condenser to the boiler as feed water; a heat storage / steam generating device having a heat storage function for storing heat by utilizing surplus energy generated in its own system, and a steam generating function for converting the feed water into steam by the stored heat, to which a portion of the feed water guided by the water supply pipe is introduced; a steam supply pipe that supplies the steam generated by the heat storage / steam generation device to its own system; a third steam turbine provided between the first steam turbine and the second steam turbine in a flow direction of the steam flow; a reheat boiler that reheats steam discharged from the first steam turbine; a high-temperature reheat steam pipe that introduces reheat steam reheated in the reheat boiler into the third steam turbine; a first extraction pipe provided at a predetermined turbine stage of the first steam turbine; a first feedwater heater disposed in the feedwater pipe and configured to heat the feedwater using bleed air introduced from the first bleed air pipe; a second extraction pipe provided at a predetermined turbine stage of the third steam turbine; a second feedwater heater that is interposed in the feedwater pipe and heats the feedwater using the bleed air introduced from the second bleed air pipe; Equipped with the excess energy is energy of excess steam generated in the boiler or energy of excess steam superheated in the reheat boiler, The heat storage / steam generation device stores the heat contained in the surplus steam, The power generation facility is characterized in that the surplus steam that has given heat to the heat storage / steam generation device is introduced into the first extraction pipe or the second extraction pipe.

3. A boiler for generating steam; a first steam turbine into which steam generated in the boiler is introduced; a second steam turbine provided downstream of the first steam turbine in a flow direction of the steam flow; a condenser that condenses steam discharged from the second steam turbine; a feed water pipe that guides the condensed water condensed in the condenser to the boiler as feed water; a heat storage / steam generating device having a heat storage function for storing heat by utilizing surplus energy generated in its own system, and a steam generating function for converting the feed water into steam by the stored heat, to which a portion of the feed water guided by the water supply pipe is introduced; a steam supply pipe that supplies the steam generated by the heat storage / steam generation device to its own system; an extraction pipe provided at a predetermined turbine stage of the second steam turbine; a feedwater heater disposed in the feedwater pipe and configured to heat the feedwater using the extracted air introduced from the extracted air pipe; Equipped with A power generation facility characterized in that the system to which steam is supplied by the steam supply pipe is the steam extraction pipe.

4. A boiler for generating steam; a first steam turbine into which steam generated in the boiler is introduced; a second steam turbine provided downstream of the first steam turbine in a flow direction of the steam flow; a condenser that condenses steam discharged from the second steam turbine; a feed water pipe that guides the condensed water condensed in the condenser to the boiler as feed water; a heat storage / steam generating device having a heat storage function for storing heat by utilizing surplus energy generated in its own system, and a steam generating function for converting the feed water into steam by the stored heat, to which a portion of the feed water guided by the water supply pipe is introduced; a steam supply pipe that supplies the steam generated by the heat storage / steam generation device to its own system; a feedwater pump drive turbine that drives a feedwater pump that pressure-feeds feedwater to the feedwater pipe; a feedwater pump driven turbine steam supply pipe that supplies a portion of the steam to be introduced into the second steam turbine to the feedwater pump driven turbine; Equipped with A power generation facility characterized in that the system to which steam is supplied by the steam supply pipe is the feedwater pump drive turbine.

5. A boiler for generating steam; a first steam turbine into which steam generated in the boiler is introduced; a second steam turbine provided downstream of the first steam turbine in a flow direction of the steam flow; a condenser that condenses steam discharged from the second steam turbine; a feed water pipe that guides the condensed water condensed in the condenser to the boiler as feed water; a heat storage / steam generating device having a heat storage function for storing heat by utilizing surplus energy generated in its own system, and a steam generating function for converting the feed water into steam by the stored heat, to which a portion of the feed water guided by the water supply pipe is introduced; a steam supply pipe for supplying the steam generated by the heat storage / steam generating device to its own system; Equipped with The heat storage and steam generation device is A container filled with a chemical heat storage material; A heat exchange pipe arranged between the chemical heat storage materials in the container; A water supply pipe that supplies water or water vapor to the chemical heat storage material; a drainage pipe for discharging water or water vapor generated in the chemical thermal storage material; Equipped with When storing heat in the heat storage / steam generation device, The surplus steam having the surplus energy is supplied to the heat exchange pipe, The water or water vapor generated in the chemical heat storage material is discharged from the drain pipe, When steam is generated in the heat storage / steam generation device, Water or water vapor is supplied to the chemical thermal storage material from the water supply pipe, Water is supplied to the heat exchange piping from the water supply pipe, The power generation facility is characterized in that steam generated in the heat exchange pipe is supplied to the steam supply pipe.

6. A boiler for generating steam; a first steam turbine into which steam generated in the boiler is introduced; a second steam turbine provided downstream of the first steam turbine in a flow direction of the steam flow; a condenser that condenses steam discharged from the second steam turbine; a feed water pipe that guides the condensed water condensed in the condenser to the boiler as feed water; a heat storage / steam generating device having a heat storage function for storing heat by utilizing surplus energy generated in its own system, and a steam generating function for converting the feed water into steam by the stored heat, to which a portion of the feed water guided by the water supply pipe is introduced; a steam supply pipe for supplying the steam generated by the heat storage / steam generating device to its own system; Equipped with The heat storage and steam generation device is A first container filled with a chemical heat storage material; Heat exchange piping arranged between the chemical thermal storage materials in the first container; A water supply pipe that supplies water or water vapor to the chemical heat storage material; a drainage pipe for discharging water or water vapor generated in the chemical thermal storage material; a second container filled with a latent heat storage material or a sensible heat storage material; a connecting pipe connecting the heat exchange piping and the second container; Equipped with When storing heat in the heat storage / steam generation device, The surplus steam having the surplus energy is supplied to the heat exchange pipe, the excess steam is supplied from the heat exchange pipe into the second container through the connecting pipe, The water or water vapor generated in the chemical heat storage material is discharged from the drain pipe, When steam is generated in the heat storage / steam generation device, Water is supplied into the second container from the water supply pipe, Water or water vapor is supplied to the chemical thermal storage material from the water supply pipe, the feed water is supplied in a water or steam state from the second container to the heat exchange pipe through the connecting pipe, The power generation facility is characterized in that steam generated in the heat exchange pipe is supplied to the steam supply pipe.

7. A boiler for generating steam; a first steam turbine into which steam generated in the boiler is introduced; a second steam turbine provided downstream of the first steam turbine in a flow direction of the steam flow; a condenser that condenses steam discharged from the second steam turbine; a feed water pipe that guides the condensed water condensed in the condenser to the boiler as feed water; a heat storage / steam generating device having a heat storage function for storing heat by utilizing surplus energy generated in its own system, and a steam generating function for converting the feed water into steam by the stored heat, to which a portion of the feed water guided by the water supply pipe is introduced; a steam supply pipe for supplying the steam generated by the heat storage / steam generating device to its own system; Equipped with The heat storage and steam generation device is A container filled with a chemical heat storage material; A heat exchange pipe arranged between the chemical heat storage materials in the container; a thermoelectric conversion device that is disposed between the chemical heat storage materials in the container and generates heat by utilizing surplus power that is the surplus energy; A water supply pipe that supplies water or water vapor to the chemical heat storage material; a drainage pipe for discharging water or water vapor generated in the chemical thermal storage material; Equipped with When storing heat in the heat storage / steam generation device, The surplus power is supplied to the thermoelectric conversion device, The water or water vapor generated in the chemical heat storage material is discharged from the drain pipe, When steam is generated in the heat storage / steam generation device, Water or water vapor is supplied to the chemical thermal storage material from the water supply pipe, Water is supplied to the heat exchange piping from the water supply pipe, The power generation facility is characterized in that steam generated in the heat exchange pipe is supplied to the steam supply pipe.

8. A third steam turbine disposed between the first steam turbine and the second steam turbine in the flow direction of the steam flow; a reheat boiler that reheats steam discharged from the first steam turbine; a high-temperature reheat steam pipe that introduces reheated steam reheated in the reheat boiler into the third steam turbine; The power generation facility according to any one of claims 3 to 7, further comprising:

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