Peak regulation and frequency modulation heat storage device

Abstract

The invention provides a peak-shaving and frequency-modulation heat storage device. The peak-shaving and frequency-modulation heat storage device comprises a heat storage part and a heat exchange part, an inlet of the steam main pipe is communicated with a steam outlet of the medium-pressure cylinder, an outlet of the steam main pipe is communicated with an inlet of the steam supply branch pipe and an inlet of the heat storage branch pipe, an outlet of the steam supply branch pipe is communicated with a steam inlet of the low-pressure cylinder, the heat storage branch pipe is in heat exchange connection with the heat storage part, and an outlet of the heat storage branch pipe is communicated with a water supply port of the boiler. The heat release pipe is in heat exchange connection with the heat storage part, an inlet of the heat release pipe and an outlet of the heat release pipe are both communicated with a secondary pipe network, and the inlet of the heat release pipe is located on the upstream of the outlet of the heat release pipe in the flow direction of the secondary pipe network; the steam supply valve is arranged on the steam supply branch pipe, and the heat release valve is arranged on the heat release pipe. Through the technical scheme provided by the invention, the problem that the minimum output load of the thermal power generating unit cannot meet the peak regulation and frequency modulation of the power grid in the related technology can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of resource utilization in thermal power plants, and more particularly, to a peak shaving and frequency modulation heat storage device. Background Art

[0002] With the transformation of the power system, against the background that power spot trading markets have been or are about to be launched in provincial power grids, there are currently two main directions for the flexibility transformation of thermal power units: improving the flexibility of thermal power units on the boiler and steam turbine body side and external heat storage to reduce cold source losses. Among them, for the flexible transformation of thermal power units to adapt to grid peak shaving and frequency modulation, it is usually required that thermal power units can operate stably at lower loads or quickly respond to load changes. The cold source loss of thermal power units generally refers to the part of heat energy that fails to be converted into useful work during the power generation process. This part of heat energy is usually released into the condenser when steam condenses and finally dissipated into the environment.

[0003] In related technologies, the transformation technologies on the boiler and steam turbine body side mainly include low-load stable combustion technology, high back-pressure operation technology, zero output of the low-pressure cylinder technology, etc. The external heat storage technologies mainly include electrode boilers + hot water storage tanks, molten salt heat storage, and solid heat storage technologies. By storing electricity or steam in the form of heat during peak shaving periods, the effect of peak shaving and valley filling can be achieved, and the operation is more flexible.

[0004] However, in related technologies, the minimum output load of most thermal power units has been reduced to 30% to 40% of the rated load, but it has gradually been unable to meet the grid's requirements for peak shaving and frequency modulation. Summary of the Invention

[0005] The present invention provides a peak shaving and frequency modulation heat storage device to solve the problem that the minimum output load of thermal power units in related technologies cannot meet the grid's requirements for peak shaving and frequency modulation.

[0006] The present invention provides a peak shaving and frequency modulation heat storage device, which includes: a heat storage member; a steam pipeline, including a steam main pipe, a steam supply branch pipe, and a heat storage branch pipe. The inlet of the steam main pipe is connected to the steam outlet of the intermediate pressure cylinder, the outlet of the steam main pipe is respectively connected to the inlet of the steam supply branch pipe and the inlet of the heat storage branch pipe, the outlet of the steam supply branch pipe is connected to the steam inlet of the low-pressure cylinder, the heat storage branch pipe is heat exchange connected to the heat storage member, and the outlet of the heat storage branch pipe is connected to the water supply port of the boiler; a heat release pipe, which is heat exchange connected to the heat storage member, and both the inlet and the outlet of the heat release pipe are connected to the secondary pipe network. In the flow direction of the secondary pipe network, the inlet of the heat release pipe is located upstream of the outlet of the heat release pipe; a valve body assembly, including a heat storage valve, a steam supply valve, and a heat release valve. The heat storage valve is arranged on the heat storage branch pipe, the steam supply valve is arranged on the steam supply branch pipe, and the heat release valve is arranged on the heat release pipe.

[0007] Furthermore, the heat storage element has a heat storage cavity and a solid heat storage unit arranged in the heat storage cavity, and the heat storage branch pipe and the heat release pipe are both arranged in the heat storage cavity.

[0008] Furthermore, the heat storage branch pipe includes: a first inlet pipe, the outlet of the steam main pipe is connected to the inlet of the first inlet pipe, and the heat storage valve is arranged on the first inlet pipe; a heat storage heat exchange element is arranged in the heat storage chamber, the outlet of the first inlet pipe is connected to the inlet of the heat storage heat exchange element; a first outlet pipe, the outlet of the heat storage heat exchange element is connected to the inlet of the first outlet pipe, and the outlet of the first outlet pipe is connected to the water supply port.

[0009] Furthermore, the valve body assembly also includes a discharge valve arranged on the first outlet pipe.

[0010] Furthermore, the heat storage chamber includes a first cavity and a second cavity, the heat storage element also has a heat exchange port connecting the first cavity and the second cavity, the solid heat storage unit is arranged in the heat storage chamber, the heat storage branch pipe is arranged in the first cavity, and the heat release pipe is arranged in the second cavity.

[0011] Furthermore, the heat storage element also has a heat exchange fan arranged in the second cavity.

[0012] Furthermore, the heat release pipe includes: a second inlet pipe, the inlet of the second inlet pipe is connected to the secondary pipe network; a heat release heat exchange component, which is arranged in the heat storage chamber, and the outlet of the second inlet pipe is connected to the inlet of the heat release heat exchange component; a second outlet pipe, the outlet of the heat release heat exchange component is connected to the inlet of the second outlet pipe, and the outlet of the second outlet pipe is connected to the secondary pipe network, and the heat release valve is arranged on the second inlet pipe and / or the second outlet pipe, and in the flow direction of the secondary pipe network, the inlet of the second inlet pipe is located upstream of the outlet of the second outlet pipe.

[0013] Furthermore, the peak-shaving and frequency-regulating heat storage device includes a condenser, the outlet of the heat storage branch pipe is connected to the inlet of the condenser, and the outlet of the condenser is connected to the water supply port.

[0014] Furthermore, the peak-shaving and frequency-regulating heat storage device also includes a water supply pipe, the outlet of the condenser is connected to the inlet of the water supply pipe, and the peak-shaving and frequency-regulating heat storage device also includes a heating element, which is arranged on the water supply pipe, and the outlet of the water supply pipe is connected to the water supply port.

[0015] Furthermore, the boiler water supply component also includes: a deaerator, arranged on the water supply pipe, a heating component including a high-pressure heater and a low-pressure heater, the high-pressure heater is arranged downstream of the deaerator, and the low-pressure heater is arranged upstream of the deaerator; and / or a feed water pump, arranged on the water supply pipe.

[0016] Applying the technical solution of the present invention, the peak shaving and frequency modulation heat storage device includes a heat storage member, a steam pipeline, a heat release pipe, and a valve body assembly. Among them, the peak shaving and frequency modulation heat storage device has a heat storage state and a heat release state. When the peak shaving and frequency modulation heat storage device is in the heat storage state, the heat release valve is in the closed state, the heat storage valve and the steam supply valve are both in the open state, and the opening degree of the heat storage valve is greater than that of the steam supply valve, so that the steam outlet of the intermediate pressure cylinder supplies most of the steam to the heat storage branch pipe. The heat storage branch pipe is heat exchange connected to the heat storage member, and stores the heat carried by this part of the steam in the heat storage member. The steam after heat release enters the water supply port of the boiler and continues to circulate. When the peak shaving and frequency modulation heat storage device is in the heat release state, the heat release valve and the steam supply valve are both in the open state, the heat storage valve is in the closed state, and the heat release pipe is heat exchange connected to the heat storage member to transfer the heat stored in the heat storage body to the circulating water of the secondary pipe network through secondary heat exchange to generate high-quality steam, which can create higher economic benefits. Using the steam at the outlet of the intermediate pressure cylinder of the thermal power plant for heat storage can minimize the cold source loss of the system, improve the energy utilization efficiency, give full play to the positioning of the thermal power plant as a regulating energy source in the power grid, realize rapid load response to the power grid peak shaving instruction, create benefits, make the system operation more flexible, effectively assist the "three reforms linkage" of the thermal power plant, and stimulate the new vitality of the green and low-carbon development of coal-fired power. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0018] Figure 1 shows a schematic structural diagram of a peak shaving and frequency modulation heat storage device according to an embodiment of the present invention;

[0019] Figure 2 shows a schematic structural diagram of a heat storage member, a heat storage branch pipe, and a heat storage valve of a peak shaving and frequency modulation heat storage device according to an embodiment of the present invention;

[0020] Figure 3 shows a schematic structural diagram of a heat storage member, a heat release branch pipe, a secondary pipe network, and a heat release valve of a peak shaving and frequency modulation heat storage device according to an embodiment of the present invention.

[0021] Among them, the above-mentioned drawings include the following reference numerals:

[0022] 10. Heat storage member;

[0023] 20. Steam pipeline; 21. Steam main pipe; 22. Steam supply branch pipe; 23. Heat storage branch pipe; 231. First inlet pipe; 232. Heat storage heat exchange member; 233. First outlet pipe; 234. Drain valve;

[0024] 30. Boiler; 31. Water supply port;

[0025] 40. heat release pipe; 41. second inlet pipe; 42. heat release heat exchange element; 43. second outlet pipe;

[0026] 50. Valve body assembly; 51. Heat storage valve; 52. Steam supply valve; 53. Heat release valve;

[0027] 61. Condenser; 62. Water supply pipe; 63. Heating element; 631. High-pressure heater; 632. Low-pressure heater; 64. Deaerator; 65. Feedwater pump;

[0028] 71. High-pressure cylinder; 72. Medium-pressure cylinder; 73. Low-pressure cylinder; 74. Generator;

[0029] 80. Secondary pipe network. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] like Figures 1 to 3 As shown, an embodiment of the present invention provides a peak-shaving and frequency-modulating heat storage device, which includes a heat storage element 10, a steam pipeline 20, a heat release pipe 40 and a valve body assembly 50. The steam pipeline 20 includes a steam main pipe 21, a steam supply branch pipe 22 and a heat storage branch pipe 23. The inlet of the steam main pipe 21 is connected to the steam outlet of the medium-pressure cylinder 72, and the outlet of the steam main pipe 21 is respectively connected to the inlet of the steam supply branch pipe 22 and the inlet of the heat storage branch pipe 23. The outlet of the steam supply branch pipe 22 is connected to the steam inlet of the low-pressure cylinder 73. The heat storage branch pipe 23 is connected to the heat storage element 10 for heat exchange. The heat storage branch pipe 23 The outlet is connected to the water supply port 31 of the boiler 30, the heat release pipe 40 is connected to the heat storage component 10 for heat exchange, the inlet and outlet of the heat release pipe 40 are both connected to the secondary pipe network 80, in the flow direction of the secondary pipe network 80, the inlet of the heat release pipe 40 is located upstream of the outlet of the heat release pipe 40, and the outlet of the heat release pipe 40 is connected to the steam supply port 32 of the boiler 30, the valve body assembly 50 includes a heat storage valve 51, a steam supply valve 52 and a heat release valve 53, the heat storage valve 51 is arranged on the heat storage branch pipe 23, the steam supply valve 52 is arranged on the steam supply branch pipe 22, and the heat release valve 53 is arranged on the heat release pipe 40.

[0032] The peak-shaving and frequency-regulating heat storage device provided in this embodiment is applied, and the peak-shaving and frequency-regulating heat storage device includes a heat storage component 10, a steam pipeline 20, a heat release pipe 40 and a valve body assembly 50, wherein the peak-shaving and frequency-regulating heat storage device has a heat storage state and a heat release state. When the peak-shaving and frequency-regulating heat storage device is in the heat storage state, the heat release valve 53 is in a closed state, and the heat storage valve 51 and the steam supply valve 52 are both in an open state, and the opening of the heat storage valve 51 is greater than the opening of the steam supply valve 52, so that the steam outlet of the intermediate pressure cylinder supplies most of the steam to the heat storage branch pipe 23, and the heat storage branch pipe 23 is connected to the heat storage component 10 for heat exchange, and the heat carried by this part of the steam is stored in the heat storage component 10, and the steam after heat release enters the water supply port 31 of the boiler 30 to continue to circulate. When the peak-shaving and frequency-regulating heat storage device is in the heat-releasing state, the heat-releasing valve 53 and the steam supply valve 52 are both in the open state, the heat storage valve 51 is in the closed state, and the heat-releasing pipe 40 is connected to the heat storage element 10 for heat exchange, so as to transfer the heat stored in the heat storage element 10 to the circulating water of the secondary pipe network 80 through secondary heat exchange, thereby generating high-quality steam and creating higher economic benefits. Using the outlet steam of the medium-pressure cylinder of a thermal power plant for heat storage can minimize the loss of the system's cold source, improve the efficiency of energy utilization, give full play to the positioning of the thermal power plant as a regulating energy source in the power grid, realize the rapid response of the load to the peak-shaving command of the power grid, create benefits, make the system run more flexibly, and effectively assist the "three-change linkage" of thermal power plants, and stimulate new vitality for the green and low-carbon development of coal-fired power.

[0033] Specifically, the peak-shaving and frequency-regulating heat storage device also includes a first flow meter, a second flow meter and a control component. The first flow meter is arranged on the heat storage branch pipe 23, and the second flow meter is arranged on the steam supply branch pipe 22. The control component is respectively connected to the first flow meter, the second flow meter, the heat storage valve 51 and the steam supply valve 52 by signals. Therefore, when the peak-shaving and frequency-regulating heat storage device is in the heat storage state, the control component controls the opening of the heat storage valve 51 to be greater than the opening of the steam supply valve 52 according to the detection results of the first flow meter and the second flow meter.

[0034] like Figure 1 As shown, the peak-shaving and frequency-regulating heat storage device also includes a high-pressure cylinder 71 and a generator 73. The steam outlet of the boiler 30 is connected to the steam inlet of the high-pressure cylinder 71. The boiler 30 heats water to provide steam to the high-pressure cylinder 71. The steam outlet of the high-pressure cylinder 71 is connected to the steam inlet of the medium-pressure cylinder 72. The steam of the low-pressure cylinder 73 is used to generate electricity through the generator 74.

[0035] like Figure 2 and Figure 3As shown, the heat storage element 10 has a heat storage chamber and a solid heat storage unit arranged in the heat storage chamber, and the heat storage branch pipe 23 and the heat release pipe 40 are both passed through the heat storage chamber. The solid heat storage unit can store and release heat more effectively, improve the efficiency of heat storage and heat release, and is suitable for scenarios that require long-term heat storage and rapid heat release. For example, in the case of large fluctuations in electricity demand, the solid heat storage unit can quickly respond to grid demand, release stored heat, generate high-quality steam, improve the peak-shaving and frequency-regulating capabilities of thermal power units, and ensure the safe and stable operation of the power system.

[0036] like Figure 2 As shown, the heat storage branch pipe 23 includes a first inlet pipe 231, a heat storage heat exchange component 232 and a first outlet pipe 233. The outlet of the steam main pipe 21 is connected to the inlet of the first inlet pipe 231. The heat storage valve 51 is arranged on the first inlet pipe 231. The heat storage heat exchange component 232 is arranged in the heat storage chamber. The outlet of the first inlet pipe 231 is connected to the inlet of the heat storage heat exchange component 232. The outlet of the heat storage heat exchange component 232 is connected to the inlet of the first outlet pipe 233. The outlet of the first outlet pipe 233 is connected to the water supply port 31. This design allows the steam to have independent pipelines before entering the heat storage component 10 and after leaving the heat storage component 10, which is convenient for controlling and adjusting the steam flow. In actual application, when the grid load is low, the steam supply valve 52 can be closed, the heat storage valve 51 can be opened, and the steam at the outlet of the medium-pressure cylinder can be introduced into the heat storage chamber for storage; when the grid load is high, the heat storage valve 51 can be closed, the steam supply valve 52 can be opened, and the stored steam can be supplied to the low-pressure cylinder after heat exchange, so as to realize peak load regulation and frequency regulation, and improve the operating efficiency and economic benefits of the thermal power unit.

[0037] like Figure 2 As shown, the valve body assembly 50 also includes a discharge valve 234 disposed on the first outlet pipe 233. When the thermal power unit is running at low load, the discharge valve 234 can discharge the steam after heat release to prevent steam from accumulating in the system, affecting the normal operation of the thermal power unit, and reducing the operating cost of the system.

[0038] In this embodiment, the heat storage chamber includes a first cavity and a second cavity, and the heat storage element 10 also has a heat exchange port connecting the first cavity and the second cavity. The solid heat storage unit is arranged in the heat storage chamber, the heat storage branch pipe 23 is passed through the first cavity, and the heat release pipe 40 is passed through the second cavity. This dual-cavity design can separate the heat storage and heat release processes and improve the heat exchange efficiency. In practical applications, the first cavity is used for heat storage of steam, and the second cavity is used for heat release of the heat release pipe. The heat is transferred through the heat exchange port, which not only improves the heat exchange efficiency, but also reduces the operating cost of the system, and improves the operating flexibility and reliability of the thermal power unit.

[0039] In this embodiment, the heat storage element 10 further has a heat exchange fan disposed in the second cavity. When the thermal power unit quickly responds to the grid peak load instruction, the heat exchange fan can accelerate the heat release process, ensure that the thermal power unit can quickly adjust the output, meet the grid load demand, and improve the operating efficiency and economic benefits of the thermal power unit.

[0040] like Figure 3 As shown, the heat release pipe 40 includes a second inlet pipe 41, a heat release heat exchanger 42 and a second outlet pipe 43. The inlet of the second inlet pipe 41 is connected to the secondary pipe network 80. The heat release heat exchanger 42 is arranged in the heat storage chamber. The outlet of the second inlet pipe 41 is connected to the inlet of the heat release heat exchanger 42. The outlet of the heat release heat exchanger 42 is connected to the inlet of the second outlet pipe 43. The outlet of the second outlet pipe 43 is connected to the secondary pipe network 80. The heat release valve 53 is arranged on the second inlet pipe 41 and / or the second outlet pipe 43. In the flow direction of the secondary pipe network 80, the inlet of the second inlet pipe 41 is located upstream of the outlet of the second outlet pipe 43. In the process of peak and frequency regulation of the thermal power unit, the heat release heat exchanger 42 can ensure that the water fully absorbs heat, generates high-quality steam, reduces the system operation cost, and improves the operation efficiency and economic benefits of the thermal power unit.

[0041] like Figure 1 As shown, the peak-shaving and frequency-regulating heat storage device includes a condenser 61, the outlet of the heat storage branch pipe 23 is connected to the inlet of the condenser 61, and the outlet of the condenser 61 is connected to the water supply port 31. During the peak-shaving and frequency-regulating process of the thermal power unit, the condenser 61 can cool the steam after heat release into water, and then enter the boiler 30 through the water supply port 31, so as to realize the recycling of energy, reduce the system operation cost, improve the operation efficiency and economic benefits of the thermal power unit, and also reduce the pollution to the environment.

[0042] like Figure 1 As shown, the steam outlet of the low-pressure cylinder 73 is connected to the inlet of the condenser 61, and the steam that releases heat to generate electricity through the generator 74 enters the condenser 61, and the condenser 61 cools the steam after releasing heat into water.

[0043] like Figure 1 As shown, the peak-shaving and frequency-modulating heat storage device further includes a water supply pipe 62, the outlet of the condenser 61 is connected to the inlet of the water supply pipe 62, and the peak-shaving and frequency-modulating heat storage device further includes a heating element 63, which is arranged on the water supply pipe 62, and the outlet of the water supply pipe 62 is connected to the water supply port 31. During the peak-shaving and frequency-modulating process of the thermal power unit, the heating element 63 can further increase the temperature of the water entering the boiler, reduce the heating burden of the boiler, improve the energy utilization efficiency, reduce the system operation cost, and improve the operation efficiency and economic benefits of the thermal power unit.

[0044] like Figure 1As shown, the peak-shaving and frequency-regulating heat storage device further includes a deaerator 64, which is arranged on the water supply pipe 62, and a heating element 63 includes a high-pressure heater 631 and a low-pressure heater 632, wherein the high-pressure heater 631 is arranged downstream of the deaerator 64, and the low-pressure heater 632 is arranged upstream of the deaerator 64. During the peak-shaving and frequency-regulating process of the thermal power unit, the arrangement of the deaerator 64 and the heating element 63 can ensure that the water entering the boiler is fully deoxygenated and preheated, thereby improving the operating efficiency of the boiler.

[0045] like Figure 1 As shown, the peak-shaving and frequency-regulating heat storage device further includes a water supply pump 65, which is arranged on the water supply pipe 62. During the peak-shaving and frequency-regulating process of the thermal power unit, the arrangement of the water supply pump 65 can ensure a stable supply of water, ensure that the thermal power unit can quickly respond to the peak-shaving instruction of the power grid, meet the load demand of the power grid, improve the operating efficiency and economic benefits of the thermal power unit, and also reduce pollution to the environment, and realize the green and low-carbon transformation of the power system.

[0046] In general, the peak-shaving and frequency-regulating heat storage device of the present invention has the advantages of high heat storage efficiency, fast heat release speed, low operating cost, flexible operation, high reliability, and low environmental pollution. It is suitable for peak-shaving and frequency regulation of thermal power units in power systems, especially in power grids with a high proportion of renewable energy. It can effectively balance the load of the power grid, improve the operating flexibility of thermal power units, reduce system operating costs, and improve the operating efficiency and economic benefits of thermal power units. At the same time, it can also reduce pollution to the environment and realize the green and low-carbon transformation of the power system.

[0047] This technology fully considers the overall operating efficiency of the steam turbine. On the basis of meeting the peak load regulation of the power grid, it maximizes the energy utilization efficiency, realizes the flexible adjustment of thermal power units, achieves the purpose of flexible load response capability to participate in the auxiliary service market, and reduces unnecessary cold source losses.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0049] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0050] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0051] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0052] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A peak-shaving and frequency-modulating heat storage device, characterized in that: The peak-shaving and frequency-regulating heat storage device comprises: Heat storage element (10); The steam pipeline (20) comprises a steam main pipe (21), a steam supply branch pipe (22) and a heat storage branch pipe (23); the inlet of the steam main pipe (21) is connected to the steam outlet of the medium-pressure cylinder (72); the outlet of the steam main pipe (21) is respectively connected to the inlet of the steam supply branch pipe (22) and the inlet of the heat storage branch pipe (23); the outlet of the steam supply branch pipe (22) is connected to the steam inlet of the low-pressure cylinder (73); the heat storage branch pipe (23) is connected to the heat storage element (10) for heat exchange; and the outlet of the heat storage branch pipe (23) is connected to the water supply port (31) of the boiler (30); A heat release pipe (40) is connected to the heat storage element (10) for heat exchange, the inlet of the heat release pipe (40) and the outlet of the heat release pipe (40) are both connected to the secondary pipe network (80), and in the flow direction of the secondary pipe network (80), the inlet of the heat release pipe (40) is located upstream of the outlet of the heat release pipe (40); The valve body assembly (50) comprises a heat storage valve (51), a steam supply valve (52) and a heat release valve (53); the heat storage valve (51) is arranged on the heat storage branch pipe (23); the steam supply valve (52) is arranged on the steam supply branch pipe (22); and the heat release valve (53) is arranged on the heat release pipe (40).

2. The peak-shaving and frequency-modulating heat storage device according to claim 1, characterized in that: The heat storage element (10) comprises a heat storage chamber and a solid heat storage unit arranged in the heat storage chamber, and the heat storage branch pipe (23) and the heat release pipe (40) are both arranged in the heat storage chamber.

3. The peak-shaving and frequency-modulating heat storage device according to claim 2, characterized in that: The heat storage branch pipe (23) comprises: a first inlet pipe (231), the outlet of the steam main pipe (21) being in communication with the inlet of the first inlet pipe (231), and the heat storage valve (51) being arranged on the first inlet pipe (231); A heat storage and heat exchange component (232) is arranged in the heat storage chamber, and the outlet of the first inlet pipe (231) is connected to the inlet of the heat storage and heat exchange component (232); A first outlet pipe (233), the outlet of the heat storage and heat exchange component (232) is connected to the inlet of the first outlet pipe (233), and the outlet of the first outlet pipe (233) is connected to the water supply port (31).

4. The peak-shaving and frequency-modulating heat storage device according to claim 3, characterized in that: The valve body assembly (50) further comprises a discharge valve (234) arranged on the first outlet pipe (233).

5. The peak-shaving and frequency-modulating heat storage device according to claim 3, characterized in that: The heat storage chamber comprises a first cavity and a second cavity, the heat storage element (10) further comprises a heat exchange port communicating with the first cavity and the second cavity, the solid heat storage unit is arranged in the heat storage chamber, the heat storage branch pipe (23) is arranged in the first cavity, and the heat release pipe (40) is arranged in the second cavity.

6. The peak-shaving and frequency-modulating heat storage device according to claim 5, characterized in that: The heat storage element (10) also has a heat exchange fan arranged in the second cavity.

7. The peak-shaving and frequency-modulating heat storage device according to claim 2, characterized in that: The heat release pipe (40) comprises: a second inlet pipe (41), the inlet of the second inlet pipe (41) being connected to the secondary pipe network (80); A heat-releasing heat-exchanging component (42) is arranged in the heat storage chamber, and the outlet of the second inlet pipe (41) is connected to the inlet of the heat-releasing heat-exchanging component (42); The heat release heat exchange component (42) has an outlet connected to an inlet of the second outlet pipe (43), and the outlet of the second outlet pipe (43) is connected to the secondary pipe network (80). The heat release valve (53) is arranged on the second inlet pipe (41) and / or the second outlet pipe (43). In the flow direction of the secondary pipe network (80), the inlet of the second inlet pipe (41) is located upstream of the outlet of the second outlet pipe (43).

8. The peak-shaving and frequency-modulating heat storage device according to claim 1, characterized in that: The peak-shaving and frequency-regulating heat storage device comprises a condenser (61), the outlet of the heat storage branch pipe (23) is connected to the inlet of the condenser (61), and the outlet of the condenser (61) is connected to the water supply port (31).

9. The peak-shaving and frequency-modulating heat storage device according to claim 8, characterized in that: The peak-shaving and frequency-modulating heat storage device further comprises a water supply pipe (62), the outlet of the condenser (61) is connected to the inlet of the water supply pipe (62), and the peak-shaving and frequency-modulating heat storage device further comprises a heating element (63), the heating element (63) is arranged on the water supply pipe (62), and the outlet of the water supply pipe (62) is connected to the water supply port (31).

10. The peak-shaving and frequency-modulating heat storage device according to claim 9, characterized in that: The boiler (30) water supply component also includes: a deaerator (64) disposed on the water supply pipe (62), the heating element (63) comprising a high-pressure heater and a low-pressure heater, the high-pressure heater being disposed downstream of the deaerator (64) and the low-pressure heater being disposed upstream of the deaerator (64); and / or, A water supply pump (65) is arranged on the water supply pipe (62).

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