Steam pipe network heat storage device

Abstract

The invention provides a steam pipe network heat storage device which comprises a steam turbine structure which comprises a steam turbine body, a first main steam transmission pipeline and a first cold reheat steam transmission pipeline, the first main steam transmission pipeline communicates with the steam turbine body and an external steam heating structure, and the first cold reheat steam transmission pipeline communicates with the steam turbine body; the steam mixing part is provided with a mixing cavity, the steam mixing part comprises a second main steam transmission pipeline and a second cold steam transmission pipeline, the second main steam transmission pipeline is communicated with the mixing cavity and the first main steam transmission pipeline, and the second cold steam transmission pipeline is communicated with the mixing cavity and the first cold steam transmission pipeline; and the steam output part is connected with the steam mixing part and is communicated with the mixing cavity. According to the technical scheme, the problem that it is difficult to consider the construction cost and the peak regulation and frequency modulation effect in the prior art can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage devices, and in particular to a steam network heat storage device. Background Art

[0002] With the transformation of the power system, in the context of power grids in various regions having or about to start spot electricity trading, there are currently two main directions for the flexibility transformation of thermal power units: boiler and steam turbine body side transformation technology and external heat storage technology. Boiler and steam turbine body side transformation technology mainly includes low-load stable combustion technology, high back pressure operation technology, low-pressure cylinder zero output technology, etc., which enables the minimum output load of most units to be reduced to 30-40% of the rated load, but this can no longer meet the grid's needs for peak and frequency regulation. External heat storage technology mainly includes electrode boilers and their corresponding hot water storage tanks, molten salt heat storage and solid heat storage technologies. By storing electricity or steam in the form of heat during the peak period, the effect of peak shaving and valley filling can be achieved, but this often requires high investment to build corresponding hardware facilities. Summary of the invention

[0003] The main purpose of the present invention is to provide a steam network heat storage device to solve the problem in the related art that it is difficult to balance the construction cost and the peak-shaving and frequency-regulating effects.

[0004] In order to achieve the above-mentioned objectives, the present invention provides a steam pipe network heat storage device, comprising: a turbine structure, comprising a turbine body, a first main steam transmission pipeline and a first cold re-steam transmission pipeline, the first main steam transmission pipeline connecting the turbine body with an external steam heating structure, the first cold re-steam transmission pipeline connecting the turbine body, the main steam generated by the external steam heating structure is transmitted from the first main steam transmission pipeline to the turbine body, and the cold re-steam generated by the turbine body is transmitted to the first cold re-steam transmission pipeline; a steam mixing part, having a mixing chamber, the steam mixing part comprising a second main steam transmission pipeline and a second cold re-steam transmission pipeline, the second main steam transmission pipeline connecting the mixing chamber with the first main steam transmission pipeline, the second cold re-steam transmission pipeline connecting the mixing chamber with the first cold re-steam transmission pipeline, so as to input part of the main steam and part of the cold re-steam into the mixing chamber; a steam output part, connected to the steam mixing part and connected to the mixing chamber.

[0005] Furthermore, the steam network heat storage device also includes a temperature reduction and pressure reduction structure, and the temperature reduction and pressure reduction structure is arranged on the second main steam transmission pipeline.

[0006] Furthermore, the steam turbine structure also includes a first hot resteam transmission pipeline, which connects the steam turbine body and the external steam heating structure, and a first cold resteam transmission pipeline connects the steam turbine body and the external steam heating structure. The cold resteam is transmitted from the steam turbine body to the external steam heating structure, and the hot resteam generated by the external steam heating structure is transmitted from the first hot resteam transmission pipeline to the steam turbine body. The steam mixing part also includes a second hot resteam transmission pipeline, which connects the mixing chamber with the first hot resteam transmission pipeline to input part of the hot resteam into the mixing chamber.

[0007] Furthermore, the steam network heat storage device also includes a temperature reduction structure, which is arranged on the second hot resteam transmission pipeline.

[0008] Furthermore, the steam pipeline heat storage device also includes a stop valve arranged on the second cold re-steam transmission pipeline to control the on-off of the second cold re-steam transmission pipeline; and / or, the steam pipeline heat storage device also includes a flow valve arranged on the second cold re-steam transmission pipeline to control the flow of cold re-steam in the second cold re-steam transmission pipeline.

[0009] Furthermore, the steam output part includes a first steam output pipeline and a second steam output pipeline, and the steam network heat storage device also includes a decompression structure, which is arranged on the first steam output pipeline.

[0010] Furthermore, the steam mixing part has a steam inlet, the second main steam transmission pipeline is connected with the mixing chamber through the steam inlet, and the steam mixing part also includes a steam uniform distribution structure arranged at the steam inlet.

[0011] Furthermore, the steam mixing part further comprises a mixing body, a mixing chamber is formed inside the mixing body, and the second main steam transmission pipeline comprises a steam inlet section arranged at the steam inlet, and the steam inlet section is inclined relative to the surface of the mixing body.

[0012] Furthermore, a spiral guide vane is provided in the steam inlet section.

[0013] Furthermore, the steam uniform distribution structure includes a shell body which is arranged at the steam inlet, and an inclined hole is arranged on the shell body.

[0014] By applying the technical solution of the present invention, the steam generated by the external steam heating structure is mainly used to perform work on the steam turbine body to generate electricity. The first main steam transmission pipeline connects the steam turbine body and the external steam heating structure. The first cold re-steam transmission pipeline is connected to the steam turbine body. The main steam generated by the external steam heating structure is transmitted to the steam turbine body from the first main steam transmission pipeline. The main steam is converted into cold re-steam after performing work on the steam turbine body. The cold re-steam generated by the steam turbine body is transmitted to the first cold re-steam transmission pipeline. The steam mixing part has a mixing chamber. The steam mixing part includes a second main steam transmission pipeline and a second cold re-steam transmission pipeline. The second main steam transmission pipeline connects the mixing chamber with the first main steam transmission pipeline so that part of the main steam can enter the mixing chamber. The second cold re-steam transmission pipeline The steam transmission pipeline connects the mixing chamber with the first cold re-steam transmission pipeline, so that part of the cold re-steam can enter the mixing chamber. When the power grid needs peak-shaving and frequency modulation, at least part of the main steam and at least part of the cold re-steam are allowed to enter the mixing chamber, so that the main steam doing work is relatively reduced, thereby reducing the power generation to achieve the effect of peak-shaving and frequency modulation. The temperature and pressure of the cold re-steam are relatively low. The cold re-steam and the main steam are mixed so that the temperature and pressure of the mixed steam are lower than that of the main steam, so that the mixed steam is easier to use. The steam output part is connected to the steam mixing part and connected to the mixing chamber. The steam output part is used to output the mixed steam. Compared with the heat storage technical solution with more hardware facilities, the processing cost of each component of the present application is lower, so that the investment is lower. Therefore, the technical solution of the present application can effectively solve the problem in the related technology that it is difficult to take into account both the construction cost and the peak-shaving and frequency modulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0016] Figure 1 A schematic diagram showing the connection relationship principle of an embodiment of a steam network heat storage device according to the present invention is shown;

[0017] Figure 2 Shows Figure 1 A schematic cross-sectional view of a partial structure of a steam network heat storage device.

[0018] The above drawings include the following reference numerals:

[0019] 1. External steam heating structure;

[0020] 10. Steam turbine structure; 11. Steam turbine body; 12. First main steam transmission pipeline; 13. First cold re-steam transmission pipeline; 14. First hot re-steam transmission pipeline;

[0021] 20. Steam mixing part; 21. Mixing chamber; 22. Second main steam transmission pipeline; 221. Steam inlet section; 23. Second cold re-steam transmission pipeline; 24. Second hot re-steam transmission pipeline; 25. Steam inlet; 26. Steam uniform distribution structure; 261. Shell; 262. Inclined hole; 27. Mixing body;

[0022] 30. Steam output part; 31. First steam output pipeline; 32. Second steam output pipeline;

[0023] 41. Temperature reduction and pressure reduction structure; 42. Temperature reduction structure; 43. Stop valve; 44. Flow valve; 45. Pressure reduction structure. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] 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.

[0027] like Figure 1As shown, the present application provides a steam pipe network heat storage device, and an embodiment of the steam pipe network heat storage device of the present application includes: a steam turbine structure 10, a steam mixing unit 20, and a steam output unit 30; the steam turbine structure 10 includes a steam turbine body 11, a first main steam transmission pipeline 12 and a first cold re-steam transmission pipeline 13, the first main steam transmission pipeline 12 connects the steam turbine body 11 with an external steam heating structure 1, the first cold re-steam transmission pipeline 13 is connected to the steam turbine body 11, and the main steam generated by the external steam heating structure 1 is transmitted from the first main steam transmission pipeline 12 to the steam turbine body 11, the cold re-steam generated by the turbine body 11 is transmitted to the first cold re-steam transmission pipeline 13; the steam mixing part 20 has a mixing chamber 21, and the steam mixing part 20 includes a second main steam transmission pipeline 22 and a second cold re-steam transmission pipeline 23, the second main steam transmission pipeline 22 connects the mixing chamber 21 with the first main steam transmission pipeline 12, and the second cold re-steam transmission pipeline 23 connects the mixing chamber 21 with the first cold re-steam transmission pipeline 13, so as to input part of the main steam and part of the cold re-steam into the mixing chamber 21; the steam output part 30 is connected to the steam mixing part 20 and communicated with the mixing chamber 21.

[0028] By applying the technical solution of this embodiment, the steam generated by the external steam heating structure 1 is mainly used to perform work on the turbine body 11 to generate electricity. The first main steam transmission pipeline 12 connects the turbine body 11 with the external steam heating structure 1. The first cold re-steam transmission pipeline 13 is connected to the turbine body 11. The main steam generated by the external steam heating structure 1 is transmitted from the first main steam transmission pipeline 12 to the turbine body 11. The main steam is converted into cold re-steam after performing work on the turbine body 11. The cold re-steam generated by the turbine body 11 is transmitted to the first cold re-steam transmission pipeline 13. The steam mixing section 20 has a mixing chamber 21. The steam mixing section 20 includes a second main steam transmission pipeline 22 and a second cold re-steam transmission pipeline 23. The second main steam transmission pipeline 22 connects the mixing chamber 21 with the first main steam transmission pipeline 12 so that part of the main steam can enter The mixing chamber 21, the second cold re-steam transmission pipeline 23 connects the mixing chamber 21 with the first cold re-steam transmission pipeline 13, so that part of the cold re-steam can enter the mixing chamber 21. When the power grid needs peak-shaving and frequency modulation, at least part of the main steam and at least part of the cold re-steam are allowed to enter the mixing chamber 21, so that the main steam doing work is relatively reduced, thereby reducing the power generation to achieve the peak-shaving and frequency modulation effect. The temperature and pressure of the cold re-steam are relatively low. The cold re-steam and the main steam are mixed so that the temperature and pressure of the mixed steam are lower than the main steam, so that the mixed steam is easier to use. The steam output part 30 is connected to the steam mixing part 20 and connected to the mixing chamber 21. The steam output part 30 is used to output the mixed steam. Compared with the heat storage technical solution with more hardware facilities, the processing cost of each component of this embodiment is lower, so that the investment is lower. Therefore, the technical solution of this embodiment can effectively solve the problem of difficulty in taking into account both the construction cost and the peak-shaving and frequency modulation effect in the related technology.

[0029] It should be noted that the external steam heating structure 1 is a boiler, and the main steam is high-temperature and high-pressure steam from the outlet of the boiler superheater to the inlet of the high-pressure cylinder of the turbine body 11. It does work on the turbine body 11, specifically, it drives the turbine to rotate, thereby driving the generator to generate electricity. Cold reheat steam is the steam after the high-pressure cylinder of the turbine body 11 is exhausted and before it returns to the boiler reheater. After this part of steam has done work in the high-pressure cylinder, the temperature and pressure have dropped, so it is called "cold reheat". Hot reheat steam (mentioned later) is steam from the outlet of the boiler reheater to the inlet of the medium-pressure cylinder of the turbine body 11. This part of steam is heated again in the reheater, which increases the temperature and pressure, so it is called "hot reheat". Under normal circumstances, the temperature and pressure of the main steam are relatively high, the hot reheat steam is mainly high in temperature, and the temperature and pressure of the cold reheat steam are relatively low, but also higher than ordinary steam.

[0030] like Figure 1As shown, the steam network heat storage device also includes a temperature reduction and pressure reduction structure 41, which is arranged on the second main steam transmission pipeline 22. Specifically, since the temperature and pressure of the main steam are relatively high, by arranging the temperature reduction and pressure reduction structure 41 on the second main steam transmission pipeline 22, the temperature and pressure of the main steam can be reduced before the main steam enters the mixing chamber 21, so that the pressure and temperature of the main steam entering the mixing chamber 21 will not be too high, so that the steam mixed in the mixing chamber 21 can have a suitable temperature and pressure. The temperature reduction and pressure reduction structure 41 can include a pressure reduction system composed of a pressure reducing valve or a throttling orifice plate and a temperature reduction system composed of a high-pressure differential feedwater regulating valve or a throttling valve.

[0031] like Figure 1 As shown, the steam turbine structure 10 also includes a first hot resteam transmission pipeline 14, which connects the steam turbine body 11 and the external steam heating structure 1, and a first cold resteam transmission pipeline 13 connects the steam turbine body 11 and the external steam heating structure 1. The cold resteam is transmitted from the steam turbine body 11 to the external steam heating structure 1, and the hot resteam generated by the external steam heating structure 1 is transmitted from the first hot resteam transmission pipeline 14 to the steam turbine body 11. The steam mixing section 20 also includes a second hot resteam transmission pipeline 24, which connects the mixing chamber 21 with the first hot resteam transmission pipeline 14 to input part of the hot resteam into the mixing chamber 21. Specifically, the cold resteam is transmitted from the steam turbine body 11 to the external steam heating structure 1 through the first cold resteam transmission pipeline 13, and then the cold resteam is heated by the external steam heating structure 1, so that the cold resteam is converted into hot resteam, and the hot resteam is then transmitted from the steam turbine body 11 to the steam turbine body 11 through the first hot resteam transmission pipeline 14 to perform work on the steam turbine body 11, and the second hot resteam transmission pipeline 24 connects the mixing chamber 21 with the first hot resteam transmission pipeline 14, so that part of the hot resteam can be transmitted to the mixing chamber 21. In this embodiment, the mixed steam in the mixing chamber 21 is composed of cold resteam, hot resteam and main steam, and by reducing part of the hot resteam and main steam entering the steam turbine body 11, the work of steam is reduced, thereby achieving the effect of peak and frequency regulation of the power grid.

[0032] like Figure 1As shown, the steam network heat storage device also includes a temperature reduction structure 42, which is arranged on the second hot resteam transmission pipeline 24. Specifically, since the hot resteam is mainly at a high temperature, by arranging the temperature reduction structure 42 on the second hot resteam transmission pipeline 24, the temperature of the hot resteam can be reduced before the hot resteam enters the mixing chamber 21, so that the temperature of the hot resteam entering the mixing chamber 21 will not be too high, so that the steam mixed in the mixing chamber 21 can have a suitable temperature and pressure. The temperature reduction structure 42 can be composed of a high-pressure differential feedwater regulating valve or a throttle valve, etc.

[0033] like Figure 1 As shown, the steam network heat storage device also includes a stop valve 43 provided on the second cold re-steam transmission pipeline 23 to control the on-off of the second cold re-steam transmission pipeline 23; the steam network heat storage device also includes a flow valve 44 provided on the second cold re-steam transmission pipeline 23 to control the flow of cold re-steam in the second cold re-steam transmission pipeline 23. It should be noted that the second main steam transmission pipeline 22 and the second cold re-steam transmission pipeline 23 are also provided with a stop valve and a flow valve to facilitate the staff to control the on-off of cold re-steam, hot re-steam and main steam or the flow of cold re-steam, hot re-steam and main steam, so as to better achieve the effect of power grid peak regulation and frequency modulation.

[0034] like Figure 1 As shown, the steam output part 30 includes a first steam output pipeline 31 and a second steam output pipeline 32, and the steam network heat storage device further includes a decompression structure 45, which is disposed on the first steam output pipeline 31. Specifically, by arranging the decompression structure 45 on the first steam output pipeline 31, the first steam output pipeline 31 and the second steam output pipeline 32 can output mixed steam of different pressures, so that the mixed steam of different pressures can be applied to different usage scenarios.

[0035] like Figure 2 As shown, the steam mixing section 20 has a steam inlet 25, and the second main steam transmission pipeline 22 is connected to the mixing chamber 21 through the steam inlet 25. The steam mixing section 20 also includes a steam uniform distribution structure 26 arranged at the steam inlet 25. Specifically, the arrangement of the steam uniform distribution structure 26 enables the main steam to be evenly distributed when entering the mixing chamber 21, so that different steams can be quickly mixed evenly in the mixing chamber 21. It should be noted that the second cold re-steam transmission pipeline 23 and the second hot re-steam transmission pipeline 24 also have a similar structure to the second main steam transmission pipeline 22, which will not be repeated herein, and the second main steam transmission pipeline 22 and its corresponding related structures will be mainly described.

[0036] like Figure 2As shown, the steam mixing section 20 also includes a mixing body 27, a mixing chamber 21 is formed inside the mixing body 27, and the second main steam transmission pipeline 22 includes a steam inlet section 221 arranged at the steam inlet 25, and the steam inlet section 221 is inclined relative to the surface of the mixing body 27. In this embodiment, the mixing body 27 is a rectangular parallelepiped structure, and "the steam inlet section 221 relative to the surface of the mixing body 27" refers to the steam inlet section 221 being inclined relative to the surface where the steam inlet 25 is arranged, and the inclined arrangement means that the steam inlet section 221 is neither parallel to nor perpendicular to the surface, but is arranged at a certain angle. The inclined steam inlet section 221 helps to improve the flow characteristics of the main steam after entering the mixing chamber 21, so that the main steam and other steam are mixed more evenly.

[0037] like Figure 2 As shown, the steam uniform distribution structure 26 includes a shell 261 covering the steam inlet 25, and the shell 261 is provided with an inclined hole 262. Specifically, the setting of the inclined hole 262 can reduce the impact force of the main steam on the shell 261 compared with the solution of the straight hole.

[0038] In addition, in this embodiment, spiral guide vanes are provided in the steam inlet section 221. Specifically, the spiral guide vanes can change the flow direction and velocity distribution of the steam, thereby improving the flow characteristics. They make the steam flow in a spiral along the pipeline, which helps to reduce eddy currents and flow resistance and improve the uniformity of steam flow.

[0039] In general, the steam network heat storage device of this embodiment has the following beneficial effects:

[0040] (1) The steam pipe network heat storage device of this embodiment performs flexibility transformation of the thermal power plant without major hardware changes, thereby achieving rapid response of the unit load and meeting the demand for frequency regulation.

[0041] (2) The steam network heat storage device of this embodiment can give full play to the role of thermal power plants as regulating energy in the power grid, realize rapid response of loads to power grid frequency regulation commands, and create benefits.

[0042] (3) The steam pipe network heat storage device of this embodiment does not require a large-scale renovation project, which greatly saves site utilization area and cost.

[0043] (4) The steam pipe network heat storage device of this embodiment can effectively assist the "three reforms and linkage" of thermal power plants and stimulate new vitality for the green and low-carbon development of coal-fired power.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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 steam network heat storage device, characterized in that: include: A steam turbine structure (10), comprising a steam turbine body (11), a first main steam transmission pipeline (12) and a first cold re-steam transmission pipeline (13), wherein the first main steam transmission pipeline (12) connects the steam turbine body (11) with an external steam heating structure (1), and the first cold re-steam transmission pipeline (13) is connected with the steam turbine body (11), main steam generated by the external steam heating structure (1) is transmitted from the first main steam transmission pipeline (12) to the steam turbine body (11), and cold re-steam generated by the steam turbine body (11) is transmitted to the first cold re-steam transmission pipeline (13); A steam mixing section (20) having a mixing chamber (21), the steam mixing section (20) comprising a second main steam transmission pipeline (22) and a second cold re-steam transmission pipeline (23), the second main steam transmission pipeline (22) connecting the mixing chamber (21) with the first main steam transmission pipeline (12), the second cold re-steam transmission pipeline (23) connecting the mixing chamber (21) with the first cold re-steam transmission pipeline (13), so as to input part of the main steam and part of the cold re-steam into the mixing chamber (21); A steam output portion (30) is connected to the steam mixing portion (20) and communicates with the mixing chamber (21).

2. The steam network heat storage device according to claim 1, characterized in that: The steam pipe network heat storage device further comprises a temperature reduction and pressure reduction structure (41), and the temperature reduction and pressure reduction structure (41) is arranged on the second main steam transmission pipeline (22).

3. The steam network heat storage device according to claim 1, characterized in that: The steam turbine structure (10) further comprises a first hot resteam transmission pipeline (14), wherein the first hot resteam transmission pipeline (14) connects the steam turbine body (11) and the external steam heating structure (1); the first cold resteam transmission pipeline (13) connects the steam turbine body (11) and the external steam heating structure (1); the cold resteam is transmitted from the steam turbine body (11) to the external steam heating structure (1); the hot resteam generated by the external steam heating structure (1) is transmitted from the first hot resteam transmission pipeline (14) to the steam turbine body (11); the steam mixing section (20) further comprises a second hot resteam transmission pipeline (24), wherein the second hot resteam transmission pipeline (24) connects the mixing chamber (21) and the first hot resteam transmission pipeline (14) to input part of the hot resteam into the mixing chamber (21).

4. The steam network heat storage device according to claim 3, characterized in that: The steam network heat storage device further comprises a temperature reduction structure (42), wherein the temperature reduction structure (42) is arranged on the second hot resteam transmission pipeline (24).

5. The steam network heat storage device according to any one of claims 1 to 4, characterized in that: The steam network heat storage device further comprises a stop valve (43) arranged on the second cold re-steam transmission pipeline (23) to control the on-off of the second cold re-steam transmission pipeline (23); and / or, The steam network heat storage device further comprises a flow valve (44) arranged on the second cold re-steam transmission pipeline (23) to control the flow of the cold re-steam in the second cold re-steam transmission pipeline (23).

6. The steam network heat storage device according to any one of claims 1 to 4, characterized in that: The steam output part (30) comprises a first steam output pipeline (31) and a second steam output pipeline (32), and the steam pipe network heat storage device further comprises a decompression structure (45), wherein the decompression structure (45) is arranged on the first steam output pipeline (31).

7. The steam network heat storage device according to any one of claims 1 to 4, characterized in that: The steam mixing section (20) has a steam inlet (25), the second main steam transmission pipeline (22) is connected to the mixing chamber (21) through the steam inlet (25), and the steam mixing section (20) further includes a steam uniform distribution structure (26) arranged at the steam inlet (25).

8. The steam network heat storage device according to claim 7, characterized in that: The steam mixing section (20) further comprises a mixing body (27), the mixing chamber (21) being formed inside the mixing body (27), and the second main steam transmission pipeline (22) comprising a steam inlet section (221) arranged at the steam inlet port (25), the steam inlet section (221) being arranged obliquely relative to the surface of the mixing body (27).

9. The steam network heat storage device according to claim 8, characterized in that: A spiral guide vane is arranged in the steam inlet section (221).

10. The steam network heat storage device according to claim 7, characterized in that: The steam uniform distribution structure (26) comprises a shell (261) which is arranged to cover the steam inlet (25), and an inclined hole (262) is provided on the shell (261).

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