Deep peak shaving system

Abstract

This utility model discloses a deep peak-shaving system, which includes: a thermal storage tank, a top pipeline, a bottom pipeline, a first inlet pipeline, and a first outlet pipeline. The top pipeline is located at the top of the thermal storage tank, and the bottom pipeline is located at the bottom of the thermal storage tank. The inlet end of the first inlet pipeline is connected to the water supply pipeline of the heating network, the outlet end of the first inlet pipeline is connected to the top pipeline, the inlet end of the first outlet pipeline is connected to the bottom pipeline, and the outlet end of the first outlet pipeline is connected to the water supply pipeline. By connecting the thermal storage tank to the water supply pipeline, during peak-shaving, the thermal storage tank can store high-temperature heating medium and release low-temperature heating medium from the storage tank, allowing the low-temperature heating medium to mix with the high-temperature heating medium for heating. The deep peak-shaving system stores excess steam heat from the unit in the thermal storage tank, achieving thermoelectric decoupling and improving the operational flexibility of the unit during the heating season.

Description

Technical Field

[0001] This application relates to the field of heating system technology, and in particular to a deep peak-shaving system. Background Technology

[0002] The integration of large-scale renewable energy sources has brought about tremendous changes to the power system. When the power generation capacity of renewable energy accounts for a large proportion of the power grid, the uncertainty of its output will pose a huge challenge to the power system's regulation capabilities. The rapid development of new energy units has placed increasingly higher demands on the deep peak shaving of thermal power units.

[0003] Thermal power units extract high-temperature steam from the turbine and send it to a heater for heat exchange, raising the temperature of the heating medium before supplying heat. Since the heat comes from the steam extracted from the turbine, when power generation is high, steam production is high and the heating capacity is strong, and when power generation is low, steam production is low and the heating capacity is weak. This leads to heat and electricity often being coupled together, and this thermoelectric coupling characteristic greatly increases the difficulty of peak shaving for the power grid. Utility Model Content

[0004] This application aims to address at least one of the technical problems existing in the prior art or related technologies.

[0005] This application proposes a deep peak-shaving system, which includes: a thermal storage tank, a top pipeline, a bottom pipeline, a first inlet pipeline, and a first outlet pipeline. The top pipeline is located at the top of the thermal storage tank, and the bottom pipeline is located at the bottom of the thermal storage tank. The inlet end of the first inlet pipeline is connected to the water supply pipeline of the heating network, the outlet end of the first inlet pipeline is connected to the top pipeline, the inlet end of the first outlet pipeline is connected to the bottom pipeline, and the outlet end of the first outlet pipeline is connected to the water supply pipeline.

[0006] In some of the technical solutions provided in this application, the deep peak shaving system further includes: a second water outlet pipe, the inlet end of which is connected to the top pipe, and the outlet end of which is connected to the inlet end of the first water outlet pipe.

[0007] In some of the technical solutions provided in this application, the deep peak shaving system further includes: a second water inlet pipe, the inlet end of which is connected to the bottom pipe, and the outlet end of which is connected to the return water pipe of the heating network.

[0008] In some of the technical solutions provided in this application, the deep peak shaving system also includes: a booster pump, which is located in the first outlet water pipeline.

[0009] In some of the technical solutions provided in this application, the deep peak shaving system also includes: a check valve, which is located in the first outlet water pipe and is used to prevent the heating medium from flowing to the inlet end of the first outlet water pipe.

[0010] In some of the technical solutions provided in this application, the deep peak shaving system also includes: a flow meter, which is installed in the first outlet water pipeline.

[0011] In some of the technical solutions provided in this application, the deep peak shaving system further includes: a first regulating valve, which is located in the first water inlet pipe and is used to control the flow rate of the first water inlet pipe.

[0012] In some of the technical solutions provided in this application, the deep peak shaving system further includes: a second regulating valve, which is located in the second water inlet pipe and is used to control the flow rate of the second water inlet pipe.

[0013] In some of the technical solutions provided in this application, the deep peak shaving system also includes at least two shut-off valves, which are respectively located at the inlet and outlet of the booster pump.

[0014] In some of the technical solutions provided in this application, the deep peak shaving system further includes: a control device, which is used to acquire the operating status of the unit. When the operating status is deep peak shaving, the control device is used to control the first inlet pipe and the first outlet pipe to be in a connected state.

[0015] Compared with related technologies, this utility model has at least the following beneficial effects:

[0016] By connecting the thermal storage tank to the water supply pipeline, the thermal power unit can store high-temperature heating medium and release low-temperature heating medium during peak shaving, allowing the low-temperature and high-temperature heating media to mix for heating. The deep peak shaving system stores excess steam heat from the unit in the storage tank, achieving thermoelectric decoupling, improving the unit's operational flexibility during the heating season, laying the foundation for energy release during off-peak periods, strengthening the deep peak shaving capability of the heating unit, expanding the peak shaving range, and providing strong support for continuous and stable heating and increased power plant efficiency. Furthermore, this deep peak shaving system has a simple structure, reliable operation, and is easy to operate. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of some embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0018] Figure 1 This is a connection diagram of a deep peak-shaving system according to an embodiment of this application.

[0019] in, Figure 1 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0020] 100. Heat storage tank; 200. Top pipe; 300. Bottom pipe; 400. First inlet pipe; 410. First regulating valve; 500. First outlet pipe; 510. Booster pump; 520. Check valve; 530. Flow meter; 600. Second outlet pipe; 700. Second inlet pipe; 710. Second regulating valve; 20. Water supply pipe; 30. Return pipe; 40. Heater. Detailed Implementation

[0021] To better understand the above technical solutions, the technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0022] Embodiments of this application provide a deep peak-shaving system, such as Figure 1 As shown, the deep peak-shaving system includes: a thermal storage tank 100, a top pipe 200, a bottom pipe 300, a first inlet water pipe 400, and a first outlet water pipe 500. The top pipe 200 is located at the top of the thermal storage tank 100, and the bottom pipe 300 is located at the bottom of the thermal storage tank 100. The inlet end of the first inlet water pipe 400 is connected to the water supply pipe 20 of the heating network, and the outlet end of the first inlet water pipe 400 is connected to the top pipe 200. The inlet end of the first outlet water pipe 500 is connected to the bottom pipe 300, and the outlet end of the first outlet water pipe 500 is connected to the water supply pipe 20.

[0023] In this embodiment, the deep peak-shaving system is used in a power unit, specifically a thermal power unit. The unit's heating network provides heat energy to the heating recipients through a high-temperature heating medium, such as water. The heating network includes interconnected heaters 40, supply water pipes 20, and return water pipes 30. The heating medium in the return water pipe 30 enters the heaters 40, where the heaters 40 use high-temperature steam generated by the unit to heat the heating medium. The heated high-temperature heating medium then flows into the supply water pipes 20 to provide heat energy to the heating recipients. The heating medium is recycled within the heating network, and the heating medium in the return water pipes 30 can be the circulating return water of the heating network.

[0024] The heat storage tank 100 is used to contain the heating medium. The heat storage tank 100 is an atmospheric pressure heat storage tank. A top pipe 200 and a bottom pipe 300 are respectively provided at the top and bottom of the heat storage tank 100. The two ends of the first inlet pipe 400 are connected to the top pipe 200 and the supply pipe 20, respectively, allowing the supply pipe 20 to connect to the top of the heat storage tank 100. The high-temperature heating medium in the supply pipe 20 can enter the top of the heat storage tank 100 through the first inlet pipe 400. Furthermore, the temperature of the high-temperature heating medium at the top is higher than the temperature of the original heating medium in the heat storage tank 100, thus creating a relatively low-temperature heating medium. In addition, since the density of the heating medium increases as the temperature decreases within the heating temperature range (i.e., the density of cold water is greater than that of hot water), the low-temperature heating medium is more likely to remain at the bottom of the heat storage tank 100. The two ends of the first outlet pipe 500 are connected to the bottom pipe 300 and the water supply pipe 20 respectively, so that the bottom of the heat storage tank 100 can be connected to the water supply pipe 20, and the low temperature heating medium at the bottom of the heat storage tank 100 can enter the water supply pipe 20 through the first outlet pipe 500.

[0025] The deep peak shaving system also includes a control device for controlling the on / off state of the first outlet pipe 500 and the first inlet pipe 400. For example, the first inlet pipe 400 and the first outlet pipe 500 are respectively provided with shut-off valves, and the control device controls the on / off state of the first inlet pipe 400 and the first outlet pipe 500 by opening and closing the shut-off valves.

[0026] The deep peak-shaving system coordinates peak-shaving operations according to the unit's operating status, including low-load and high-load states. The unit alters the steam energy distribution path through "mid-range steam extraction." When operating at low load, the unit is in peak-shaving mode, extracting maximum steam from the mid-range, allowing some boiler steam to be used for heating instead of power generation, thus reducing the unit's load. At this time, the steam volume in heater 40 is sufficient, causing the outlet water temperature of heater 40 to be higher than the required supply water temperature, meaning the heating medium temperature in supply water pipeline 20 is higher than the supply water temperature. The control device connects to the first inlet water pipeline 400, allowing the high-temperature heating medium in supply water pipeline 20 to flow sequentially through the first inlet water pipeline 400 and the top pipeline 200 via pressure difference, and then be stored in the heat storage tank 100. At the same time, the control device connects to the first outlet water pipe 500, so that the low-temperature heating medium at the bottom of the heat storage tank 100 flows sequentially through the bottom pipe 300 and the first outlet water pipe 500, and is sent to the water supply pipe 20, where it mixes with the high-temperature heating medium in the water supply pipe 20, thereby reducing the temperature of the overheated heating medium in the water supply pipe 20 to the water supply temperature, and ensuring that the flow rate of the heating medium flowing to the heating object in the water supply pipe 20 remains unchanged.

[0027] By connecting the thermal storage tank 100 to the water supply pipeline 20, the thermal storage tank 100 can store high-temperature heating medium and release low-temperature heating medium during peak shaving of the thermal power unit, allowing the low-temperature heating medium to mix with the high-temperature heating medium for heating. The deep peak shaving system stores excess steam heat from the unit in the thermal storage tank 100, achieving thermoelectric decoupling, improving the unit's operational flexibility during the heating season, laying the foundation for energy release during off-peak conditions, strengthening the deep peak shaving capability of the heating unit, expanding the peak shaving range, and providing strong support for continuous and stable heating and increased power plant efficiency. Furthermore, this deep peak shaving system has a simple structure, reliable operation, and is easy to operate.

[0028] In some embodiments provided in this application, such as Figure 1 As shown, the deep peak shaving system also includes: a second water outlet pipe 600, the inlet end of the second water outlet pipe 600 is connected to the top pipe 200, and the outlet end of the second water outlet pipe 600 is connected to the inlet end of the first water outlet pipe 500.

[0029] In this embodiment, the two ends of the second outlet pipe 600 are connected to the top pipe 200 and the first outlet pipe 500, respectively, so that the top of the heat storage tank 100 can be connected to the water supply pipe 20 through the first outlet pipe 500, and the heating medium at the top of the heat storage tank 100 can flow into the water supply pipe 20. The second outlet pipe 600 is equipped with a shut-off valve, and the control device controls the on / off state of the second outlet pipe 600 by opening and closing the shut-off valve.

[0030] When the unit is operating at increased load, and deep peak shaving is not required or peak output is needed, the control device disconnects the first inlet pipe 400 and connects the first outlet pipe 500 and the second outlet pipe 600. This allows the heating medium at the top of the thermal storage tank 100 to flow sequentially through the top pipe 200, the second outlet pipe 600, and the first outlet pipe 500, before being injected into the supply pipe 20 for heating. The deep peak shaving system can release heat from the thermal storage tank 100 when the unit is operating at increased load, enhancing the deep peak shaving capability of the heating unit, further improving the unit's operational flexibility during the heating season, as well as the thermoelectric decoupling effect, and increasing the unit's "endurance" for participating in deep peak shaving during the heating season.

[0031] In some embodiments provided in this application, such as Figure 1 As shown, the deep peak shaving system also includes: a second water inlet pipe 700, the inlet end of the second water inlet pipe 700 is connected to the bottom pipe 300, and the outlet end of the second water inlet pipe 700 is connected to the return water pipe 30 of the heating network.

[0032] In this embodiment, the two ends of the second inlet pipe 700 are connected to the bottom pipe 300 and the return pipe 30, respectively, so that the heating medium in the return pipe 30 can enter the bottom of the heat storage tank 100 through the second inlet pipe 700. The second inlet pipe 700 is equipped with a shut-off valve, and the control device controls the on / off state of the second inlet pipe 700 by opening and closing the shut-off valve.

[0033] When the unit is operating under load conditions, the control device disconnects the first inlet water pipe 400 and connects the second inlet water pipe 700, the first outlet water pipe 500, and the second outlet water pipe 600. This allows the heating medium at the top of the heat storage tank 100 to be injected into the water supply pipe 20 for heating. At the same time, the second inlet water pipe 700 sends the portion of the heating medium that has not been heated by the heater 40 into the heat storage tank 100 through pressure difference. The return water pipe 30 is used to replenish the heating medium in the heat storage tank 100, ensuring pressure balance in the heat storage tank 100. This avoids the need for additional water supply equipment, simplifies the system layout, and ensures the integrity of the flow path.

[0034] In some embodiments provided in this application, such as Figure 1 As shown, the deep peak shaving system also includes a booster pump 510, which is located in the first outlet water pipeline 500.

[0035] In this embodiment, the booster pump 510 is used to pump the heating medium in the heat storage tank 100 and deliver it to the water supply pipeline 20. The booster pump 510 provides driving force for the heating medium in the heat storage tank 100, enabling the heating medium to smoothly enter the water supply pipeline 20. Furthermore, the first outlet pipeline 500 serves as a common output channel for the deep peak shaving system under different conditions. By placing the booster pump 510 in the first outlet pipeline 500, one booster pump 510 can provide pumping function for different conditions, avoiding the need for redundant booster pumps 510, simplifying the system layout, reducing the number of driving components, and lowering component costs.

[0036] In some embodiments provided in this application, such as Figure 1 As shown, the deep peak shaving system also includes a check valve 520, which is located in the first outlet water pipe 500 and is used to prevent the heating medium from flowing to the inlet end of the first outlet water pipe 500.

[0037] In this embodiment, the first outlet pipe 500 is equipped with a check valve 520. The check valve 520 allows the heating medium to flow from the inlet end to the outlet end of the first outlet pipe 500, thereby controlling the flow direction within the first outlet pipe 500 and preventing the high-temperature heating medium in the water supply pipe 20 from flowing back into the heat storage tank 100 or other pipes, so that the heating medium can flow smoothly in a preset direction.

[0038] In some embodiments provided in this application, such as Figure 1As shown, the deep peak shaving system also includes a flow meter 530, which is installed in the first outlet water pipe 500.

[0039] In this embodiment, the flow meter 530 is used to detect the flow rate of the heating medium in the first outlet pipe 500 to obtain the water outlet status of the first outlet pipe 500, understand the water outlet status of the deep peak shaving system, and enable the control device to control the operation of the deep peak shaving system based on the flow rate to ensure the smooth operation of the water outlet.

[0040] In some embodiments provided in this application, such as Figure 1 As shown, the deep peak shaving system also includes: a first regulating valve 410, which is located in the first water inlet pipe 400 and is used to control the flow rate of the first water inlet pipe 400.

[0041] In this embodiment, the first regulating valve 410 of the first water inlet pipe 400 is used to control the flow rate of the heating medium. The control device adjusts the water inlet in the first water inlet pipe 400 by controlling the opening and closing state of the first regulating valve 410, thereby controlling the water inlet of the deep peak shaving system under low load conditions of the unit.

[0042] In some embodiments provided in this application, such as Figure 1 As shown, the deep peak shaving system also includes a second regulating valve 710, which is located in the second water inlet pipe 700 and is used to control the flow rate of the second water inlet pipe 700.

[0043] In this embodiment, the second regulating valve 710 of the second water inlet pipe 700 is used to control the flow rate of the heating medium. The control device regulates the water inlet in the second water inlet pipe 700 by controlling the opening and closing state of the second regulating valve 710, thereby controlling the water inlet of the deep peak shaving system under the load increase state of the unit.

[0044] In some embodiments provided in this application, such as Figure 1 As shown, the deep peak shaving system also includes at least two shut-off valves, which are respectively located at the inlet and outlet of the booster pump 510.

[0045] In this embodiment, the shut-off valve can disconnect the upstream and downstream pipelines of the booster pump 510, completely isolating the booster pump 510 from the system. This allows maintenance personnel to disassemble and repair the booster pump 510 without stopping the entire system, enabling live maintenance, improving maintenance efficiency and ease of operation and maintenance, and reducing downtime losses.

[0046] In some embodiments provided in this application, the deep peak shaving system further includes: a control device, which is used to acquire the operating status of the unit. When the operating status is deep peak shaving, the control device is used to control the first inlet pipe and the first outlet pipe to be in a connected state.

[0047] In some embodiments provided in this application, the control device is further configured to control the first water inlet pipe to be disconnected and the first water outlet pipe, the second water inlet pipe, and the second water outlet pipe to be connected when the operating state is the load increase state.

[0048] In this utility model, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "join," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "join" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0049] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0050] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0051] The above are merely some embodiments of this utility model and are not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A deep peak-shaving system, characterized in that, include: Thermal storage tank; Top piping is located at the top of the heat storage tank; Bottom piping is located at the bottom of the heat storage tank; The first water inlet pipe has its inlet end connected to the water supply pipe of the heating network, and its outlet end connected to the top pipe. The first water outlet pipe has its inlet end connected to the bottom pipe and its outlet end connected to the water supply pipe.

2. The deep peak-shaving system according to claim 1, characterized in that, Also includes: The second water outlet pipe has its inlet end connected to the top pipe, and its outlet end connected to the inlet end of the first water outlet pipe.

3. The deep peak-shaving system according to claim 2, characterized in that, Also includes: The second water inlet pipe has its inlet end connected to the bottom pipe and its outlet end connected to the return water pipe of the heating network.

4. The deep peak-shaving system according to claim 1 or 2, characterized in that, Also includes: A booster pump is installed in the first outlet water pipeline.

5. The deep peak-shaving system according to claim 1 or 2, characterized in that, Also includes: A check valve is installed in the first outlet water pipe, and the check valve is used to prevent the heating medium from flowing to the inlet end of the first outlet water pipe.

6. The deep peak-shaving system according to claim 1 or 2, characterized in that, Also includes: A flow meter is installed in the first outlet water pipe.

7. The deep peak-shaving system according to claim 1 or 2, characterized in that, Also includes: A first regulating valve is provided in the first water inlet pipe, and the first regulating valve is used to control the flow rate of the first water inlet pipe.

8. The deep peak-shaving system according to claim 3, characterized in that, Also includes: The second regulating valve is located in the second water inlet pipe and is used to control the flow rate of the second water inlet pipe.

9. The deep peak-shaving system according to claim 4, characterized in that, Also includes: At least two shut-off valves are provided, one at the inlet and one at the outlet of the booster pump.

10. The deep peak-shaving system according to claim 1, characterized in that, Also includes: A control device is used to acquire the operating status of the unit. When the operating status is a deep peak shaving state, the control device is used to control the first inlet pipe and the first outlet pipe to be in a connected state.

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