Adjustable steam extraction type frequency modulation and peak regulation system and method based on hot water storage tank

Abstract

According to the adjustable steam extraction type frequency modulation and peak regulation system and method based on the hot water storage tank, a closed circulating water loop and adjustable steam extraction coordinated heat storage and release framework is constructed, and the heat storage heater and the heat release heater are adopted to be connected with the unit steam extraction system and the hot water storage tank correspondingly; and in combination with flexible control of a two-way pump, a multi-way valve and a booster pump, thermoelectricity decoupling and rapid load adjustment are realized. The system utilizes extracted steam to heat closed circulating water for heat storage when the heat supply amount of the unit is rich, releases stored heat to increase the water supply temperature of a heat supply network when the heat supply amount is insufficient, and directly changes the extracted steam amount to participate in frequency modulation by dynamically adjusting the heat storage flow. According to the method, the pressure loss risk caused by the fact that heat supply network water is directly connected into the storage tank is avoided, the deep peak regulation capacity and the variable load rate of the unit are improved, and meanwhile the system operation efficiency and the heat supply stability are optimized through efficient heat exchange of closed circulating water and flexible distribution of steam extraction.

Description

Technical Field

[0001] The present invention relates to the technical field of cogeneration power generation, and in particular to an adjustable steam extraction type frequency and peak regulation system and method based on a hot water storage tank. Background Art

[0002] To ensure safe winter heating, heating units often operate in a heat-based electricity-demanding mode. This limits the unit's electrical load regulation capabilities, making it difficult to adapt to the grid's deep peak-shaving needs. When the unit's inherent flexibility improvements no longer meet actual needs, thermal decoupling can be achieved by configuring a hot water storage tank. This tank stores excess heat during peak power generation and releases it during off-peak periods to supplement the heat load, thereby reducing the unit's heating load and achieving thermal decoupling.

[0003] Thermoelectric decoupling technology for water tank heat storage achieves the spatiotemporal transfer of energy. It stores cheap thermal energy from thermal power plants in water tanks. During peak load conditions in the heating network, the water tanks and thermal power plants jointly provide heat, which can reduce the amount of heat supplied by high-priced peak heat sources and optimize system operation. While replacing the heating supply of some units, the unit's electrical load regulation range is maximized. Currently, hot water storage tanks are usually directly connected to the heating network. The heat storage and release processes require coordination of the water tank's inlet and return flows. Once the flow deviation is large, it will endanger the stability of the heating network system and cause system decompression. At the same time, since part of the unit's steam is extracted for heating, the steam involved in unit regulation is reduced, and the unit's load change rate during the heating period is significantly reduced. Summary of the Invention

[0004] In a first aspect of the present disclosure, an adjustable steam extraction frequency modulation and peak regulation system based on a hot water storage tank is provided, comprising a hot water storage tank (1), a heat storage heater (2), a heat network heater (3), a heat release heater (4), a heat network circulation pump (5), a heat storage pump (6), first to sixth switch valves (7-12), a heat storage regulating valve (13), a heat release regulating valve (15), a water pumping switch valve (14) and a booster pump (16), wherein:

[0005] The inlet of the heating network circulation pump (5) is connected to the heating network return water pipeline, and the outlet is connected to the cold side inlet of the heating network heater (3);

[0006] The hot water storage tank (1) is connected in sequence to the first switch valve (7), the heat storage pump (6), the third switch valve (9) and the heat release regulating valve (15) via a hot water pipeline to the hot side inlet of the heat release heater (4); the hot side outlet of the heat release heater (4) is connected to the hot water storage tank (1) via a fifth switch valve (11);

[0007] The hot water storage tank (1) is connected in sequence to the second switch valve (8), the heat storage pump (6), and the fourth switch valve (10) via a cold water pipeline to the cold side inlet of the heat storage heater (2); the cold side outlet of the heat storage heater (2) is connected to the hot water storage tank (1) via the heat storage regulating valve (13) and the sixth switch valve (12);

[0008] The cold side inlet of the exothermic heater (4) is connected to the inlet pipeline of the heat network circulation pump (5) via a pumping switch valve (14), and the cold side outlet is connected to the outlet pipeline of the heat network circulation pump (5) via a booster pump (16);

[0009] The hot side inlets of the heat storage heater (2) and the heat network heater (3) are connected in parallel to the steam supply and extraction pipelines of the unit, and the hot side outlet drain pipelines are connected to the condenser after merging.

[0010] In combination with the first aspect, the heat storage pump (6) is simultaneously arranged in the hot water pipeline and the cold water pipeline, and the water flow direction is switched by the opening and closing states of the first switch valve (7), the second switch valve (8), the third switch valve (9), and the fourth switch valve (10).

[0011] In combination with the first aspect, the cold side pipeline of the exothermic heater (4) and the heat network circulation pump (5) form a parallel loop, and the lift of the booster pump (16) is configured to overcome the resistance of the exothermic heater (4) and the pipeline.

[0012] A second aspect of the present disclosure provides an adjustable steam extraction frequency and peak regulation method based on a hot water storage tank, including the following modes:

[0013] Heat storage mode: close the first switch valve (7), the third switch valve (9), the fifth switch valve (11), the water pumping switch valve (14) and the heat release regulating valve (15), open the second switch valve (8), the fourth switch valve (10), the sixth switch valve (12) and the heat storage regulating valve (13), and drive the cold water to circulate between the heat storage heater (2) and the hot water storage tank (1) through the heat storage pump (6) to store heat;

[0014] Heat release mode: the second switch valve (8), the fourth switch valve (10), the sixth switch valve (12) and the heat storage regulating valve (13) are closed, and the first switch valve (7), the third switch valve (9), the fifth switch valve (11), the pumping switch valve (14) and the heat release regulating valve (15) are opened, and the hot water is driven by the heat storage pump (6) to circulate between the heat release heater (4) and the hot water storage tank (1) to release heat;

[0015] Frequency modulation mode: Based on the heat storage mode, the opening of the heat storage regulating valve (13) is dynamically adjusted to change the heat exchange amount of the heat storage heater (2), and the unit load is quickly adjusted by changing the steam extraction amount.

[0016] In combination with the second aspect, in the frequency modulation mode, when the unit load needs to be increased, the opening of the heat storage regulating valve (13) is reduced to reduce the heat storage flow; when the load needs to be reduced, the opening of the heat storage regulating valve (13) is increased to increase the heat storage flow.

[0017] In combination with the second aspect, in the heat release mode, the booster pump (16) and the heat network circulation pump (5) operate in coordination, and the return water flow of the bypass heat network is controlled by adjusting the opening of the pumping switch valve (14).

[0018] In combination with the second aspect, the heat storage mode and the heat release mode can be operated simultaneously, and parallel operation of heat storage and release can be achieved by independently controlling the cold water circulation loop and the hot water circulation loop.

[0019] In combination with the second aspect, the steam flow distribution of the heat storage heater (2) and the heat network heater (3) is adjusted according to the real-time heat load demand, and the total amount of heat extraction steam does not exceed the maximum extraction capacity of the unit.

[0020] In combination with the second aspect, when the temperature of the hot water layer of the hot water storage tank (1) is lower than the set threshold, it automatically switches to the heat storage mode to supplement heat energy; when the water supply temperature of the heating network is lower than the heating requirement, it automatically starts the heat release mode to supplement heat.

[0021] Beneficial effects: The present disclosure provides an adjustable extraction-type frequency-modulation and peak-shaving system and method based on a hot water storage tank. By constructing a heat storage and release architecture that coordinates a closed circulating water loop with adjustable extraction steam, a heat storage heater and a heat release heater are respectively connected to the unit's extraction system and the hot water storage tank, and combined with the flexible control of a two-way pump, a multi-way valve and a booster pump, thermoelectric decoupling and rapid load regulation are achieved. When the unit's heat supply is abundant, the system uses extraction steam to heat the closed circulating water for heat storage. When the heat supply is short, the stored heat is released to increase the water supply temperature of the heating network, and the extraction steam volume is directly changed to participate in frequency modulation by dynamically adjusting the heat storage flow. This method avoids the risk of decompression when the hot network water is directly connected to the storage tank, improves the unit's deep peak-shaving capability and variable load rate, and optimizes the system's operating efficiency and heating stability through efficient heat exchange of closed circulating water and flexible distribution of extraction steam. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of an adjustable steam extraction frequency and peak regulation system based on a hot water storage tank according to an embodiment of the present disclosure;

[0023] Figure 2 The present invention is a flowchart of an adjustable steam extraction frequency and peak regulation method based on a hot water storage tank according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] Exemplary embodiments are described in detail herein, with examples illustrated in the accompanying drawings. When the following description refers to the drawings, identical numerals in different drawings represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present disclosure.

[0025] The terms used in the embodiments of the present disclosure are for the purpose of describing specific embodiments only and are not intended to limit the embodiments of the present disclosure. The singular forms "a," "the," and "the" used in the embodiments of the present disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0026] It should be understood that although the terms first, second, third, etc. may be used to describe various information in the embodiments of the present disclosure, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of the embodiments of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0027] like Figure 1 The figure shows a schematic structural diagram of an adjustable steam extraction frequency modulation and peak regulation system based on a hot water storage tank according to an embodiment of the present disclosure, comprising a hot water storage tank (1), a heat storage heater (2), a heat network heater (3), a heat release heater (4), a heat network circulation pump (5), a heat storage pump (6), first to sixth switch valves (7-12), a heat storage regulating valve (13), a heat release regulating valve (15), a water pumping switch valve (14) and a booster pump (16), wherein:

[0028] The inlet of the heating network circulation pump (5) is connected to the heating network return water pipeline, and the outlet is connected to the cold side inlet of the heating network heater (3);

[0029] The hot water storage tank (1) is connected in sequence to the first switch valve (7), the heat storage pump (6), the third switch valve (9) and the heat release regulating valve (15) via a hot water pipeline to the hot side inlet of the heat release heater (4); the hot side outlet of the heat release heater (4) is connected to the hot water storage tank (1) via a fifth switch valve (11);

[0030] The hot water storage tank (1) is connected in sequence to the second switch valve (8), the heat storage pump (6), and the fourth switch valve (10) via a cold water pipeline to the cold side inlet of the heat storage heater (2); the cold side outlet of the heat storage heater (2) is connected to the hot water storage tank (1) via the heat storage regulating valve (13) and the sixth switch valve (12);

[0031] The cold side inlet of the exothermic heater (4) is connected to the inlet pipeline of the heat network circulation pump (5) via a pumping switch valve (14), and the cold side outlet is connected to the outlet pipeline of the heat network circulation pump (5) via a booster pump (16);

[0032] The hot side inlets of the heat storage heater (2) and the heat network heater (3) are connected in parallel to the steam supply and extraction pipelines of the unit, and the hot side outlet drain pipelines are connected to the condenser after merging.

[0033] Specifically, the system adopts a dual-heater parallel extraction structure. The heat storage heater (2) and the heat network heater (3) are connected to the unit extraction pipeline. The steam at the hot side inlet of the two heaters is dynamically distributed through an adjustable distribution valve. The steam after heat release is drained and merged and returned to the condenser. This design not only retains the conventional heating function, but also provides an efficient heat source for the heat storage process. The hot water storage tank (1) adopts a temperature stratified structure design. The upper high-temperature water is driven by the heat storage pump (6) through an independent hot water pipeline to enter the hot side of the heat release heater (4), and exchanges heat with the low-temperature heat network return water diverted by the pumping switch valve (14). The heated hot network water is pressurized by the booster pump (16) and returned to the main circuit, forming a heat network water supply temperature compensation mechanism. The lower low-temperature water absorbs the extraction steam heat in the heat storage heater (2) through a closed cold water cycle and then returns to the upper part of the tank body after heating, completing the heat energy storage process.

[0034] During operation, the system realizes three typical working condition switching through the combination of valve group states: under the high load heat storage working condition of the unit, the valves related to the heat release circuit are closed, and the heat storage pump drives the cold water to circulate between the heat storage heater (2) and the hot water storage tank (1), converting the excess steam extraction heat into hot water potential energy storage; under the deep peak regulation heat release working condition, the valve group is switched to open the heat release circuit, and the high temperature hot water stored in the hot water storage tank is heated by the heat release heater (4) to heat part of the heat network return water, reducing the unit's heat extraction steam demand; under the frequency modulation fast response working condition, the closed loop water flow is changed by dynamically adjusting the heat storage regulating valve (13), and the balance between the extraction steam volume and the power generation load is adjusted in real time, achieving a fast load change capability of ±2% rated load / second. The coordinated control of the booster pump (16) and the heat network circulation pump (5) can ensure that the heat network water pressure after the bypass heat exchange matches the main circuit requirement, avoiding the heat network hydraulic imbalance.

[0035] The system solves the flow fluctuation and pressure loss risks caused by direct connection of traditional heat storage systems to the heating network through the physical isolation design of the closed heat storage cycle and the main heating circuit.

[0036] Furthermore, the heat storage pump (6) is simultaneously arranged in the hot water pipeline and the cold water pipeline, and the water flow direction is switched by the opening and closing states of the first switch valve (7), the second switch valve (8), the third switch valve (9), and the fourth switch valve (10).

[0037] Specifically, the innovative configuration of the heat storage pump (6) realizes a bidirectional fluid driving function. It is integrated at the key nodes of the hot water pipeline and the cold water pipeline at the same time. The water flow direction is dynamically switched through the coordinated opening and closing operation of the first switch valve (7), the second switch valve (8), the third switch valve (9) and the fourth switch valve (10). Specifically, in the heat storage mode, the second switch valve (8) and the fourth switch valve (10) are opened, and the heat storage pump (6) drives the cold water to flow out from the lower part of the hot water storage tank (1), and returns to the upper part of the tank after absorbing heat through the heat storage heater (2); while in the heat release mode, the first switch valve (7) and the third switch valve (9) are opened, and the same heat storage pump (6) drives the hot water to flow out from the upper part of the tank in the reverse direction, and returns to the lower part after releasing heat through the heat release heater (4). This design of bidirectional pump and valve group linkage not only reduces equipment redundancy, but also realizes independent control of hot and cold water flows through a single pump body, significantly improving system integration and reliability, while avoiding energy loss and failure risks caused by multi-pump switching.

[0038] Furthermore, the cold side pipeline of the exothermic heater (4) and the heat network circulation pump (5) form a parallel loop, and the lift of the booster pump (16) is configured to overcome the resistance of the exothermic heater (4) and the pipeline.

[0039] Specifically, the cold side pipeline of the exothermic heater (4) is connected to the inlet of the heat network circulation pump (5) through the pumping switch valve (14), forming a parallel branch with the main heat supply circuit. The booster pump (16) is arranged at the cold side outlet of the exothermic heater (4), and its head is accurately designed according to the total resistance of the bypass pipeline (including the flow resistance of the exothermic heater, the friction loss of the pipeline and the local resistance), ensuring that the heated heat network water can overcome the resistance and smoothly flow into the main outlet of the heat network circulation pump (5). This design uses a pressure compensation mechanism to achieve a dynamic balance between the bypass flow and the main circuit flow, avoiding the problem of backflow or local vaporization of the heat network water caused by insufficient pressure in the bypass branch. The variable frequency control of the booster pump (16) further adapts to the flow requirements under different exothermic working conditions, ensures the stability of the heat network water supply pressure, and reduces the interference with the operating state of the main circulation pump (5).

[0040] like Figure 2 FIG. 1 is a flow chart of an adjustable steam extraction frequency and peak regulation method based on a hot water storage tank according to an embodiment of the present disclosure, including the following modes:

[0041] S101: heat storage mode, closing the first switch valve (7), the third switch valve (9), the fifth switch valve (11), the water pumping switch valve (14) and the heat release regulating valve (15), opening the second switch valve (8), the fourth switch valve (10), the sixth switch valve (12) and the heat storage regulating valve (13), and driving the cold water to circulate between the heat storage heater (2) and the hot water storage tank (1) through the heat storage pump (6) to store heat;

[0042] S102: Heat release mode, close the second switch valve (8), the fourth switch valve (10), the sixth switch valve (12) and the heat storage regulating valve (13), open the first switch valve (7), the third switch valve (9), the fifth switch valve (11), the pumping switch valve (14) and the heat release regulating valve (15), and drive the hot water to circulate between the heat release heater (4) and the hot water storage tank (1) through the heat storage pump (6) to release heat;

[0043] S103: frequency modulation mode, based on the heat storage mode, dynamically adjusts the opening of the heat storage regulating valve (13) to change the heat exchange amount of the heat storage heater (2), and realizes rapid adjustment of the unit load through the change of the steam extraction amount.

[0044] Specifically, the flexible switching of multiple scenarios is achieved through the combination of valve group states and equipment coordination. In the heat storage mode, the second, fourth, and sixth switch valves (8, 10, 12) and the heat storage regulating valve (13) are opened, and cold water flows out from the lower part of the hot water storage tank (1) driven by the heat storage pump (6), and returns to the upper part of the tank body after absorbing the heat of the extraction steam and heating it through the heat storage heater (2), thus forming a closed heat storage cycle; in the heat release mode, the first, third, and fifth switch valves (7, 9, 11), the water extraction switch valve (14), and the heat release regulating valve (15) are opened, and hot water releases heat from the upper part of the tank body through the heat release heater (4), heats the bypass heat network return water, and returns to the lower part of the tank body, while the booster pump (16) maintains the bypass water pressure; in the frequency modulation mode, based on the heat storage mode, the closed cycle water flow is changed by real-time adjustment of the opening of the heat storage regulating valve (13), thereby dynamically adjusting the extraction steam distribution, and achieving a second-level response to the power generation load of the unit.

[0045] Furthermore, in the frequency modulation mode, when the unit load needs to be increased, the opening of the heat storage regulating valve (13) is reduced to reduce the heat storage flow; when the load needs to be reduced, the opening of the heat storage regulating valve (13) is increased to increase the heat storage flow.

[0046] Specifically, in the frequency modulation mode, the opening adjustment of the heat storage regulating valve (13) directly affects the cold side water flow of the heat storage heater (2). When the power grid requires the unit to quickly increase the load, the opening of the heat storage regulating valve (13) is reduced, resulting in a decrease in the circulating water flow through the heat storage heater (2), and its heat exchange capacity is simultaneously reduced. At this time, more extraction steam returns to the steam turbine to perform work, and the unit's power generation power is rapidly increased; conversely, when the load needs to be reduced, the opening of the heat storage regulating valve (13) is increased, and the circulating water flow increases, allowing the heat storage heater (2) to absorb more extraction steam heat, reducing the steam intake of the steam turbine, and achieving rapid load reduction. This regulation process matches the power grid frequency fluctuation in real time through a closed-loop control system, and the response time can be controlled within 5 seconds, which is significantly better than the minute-level regulation capability of traditional units.

[0047] Furthermore, in the heat release mode, the booster pump (16) and the heat network circulation pump (5) operate in coordination, and the return water flow of the bypass heat network is controlled by adjusting the opening of the pumping switch valve (14).

[0048] Specifically, during the heat release mode, the opening adjustment of the water pumping switch valve (14) and the speed control of the booster pump (16) form a linkage mechanism. By increasing the opening of the water pumping switch valve (14), more return water from the heating network is diverted to the cold side of the heat release heater (4), and after being heated, it is pressurized and sent back to the main circuit by the booster pump (16). The variable frequency speed regulation function of the booster pump (16) can match the bypass flow change in real time, ensuring that the bypass outlet pressure is always slightly higher than the main circuit pressure, preventing the backflow of the heating network water. At the same time, the power allocation algorithm of the main circulation pump (5) and the booster pump (16) can be dynamically optimized according to the total water supply temperature demand of the heating network, avoiding the problem of energy consumption surge caused by the competitive operation of the two pumps.

[0049] Furthermore, the heat storage mode and the heat release mode can be operated simultaneously, and parallel operation of heat storage and release can be achieved by independently controlling the cold water circulation loop and the hot water circulation loop.

[0050] Specifically, the system supports the parallel operation of heat storage and heat release modes, and realizes the bidirectional flow of energy by independently controlling the cold water circulation loop and the hot water circulation loop. Specifically, in the heat storage mode, the second, fourth, and sixth switch valves (8, 10, 12) and the heat storage regulating valve (13) are opened, while the first, third, and fifth switch valves (7, 9, 11) of the heat release loop are kept closed; and when heat storage and release are required at the same time, the cold and hot water flows are independently circulated in their respective loops through time-sharing control or overlapping opening of some valves. For example, in the scenario where the peak load demand of the power grid and the fluctuation of the heating load are superimposed, the dynamic distribution of steam extraction heat can be achieved by adjusting the flow ratio of the two loops, which not only meets the heat storage demand but also supplements the heating gap. This parallel operation capability greatly improves the flexibility of the system in dealing with complex working conditions.

[0051] Furthermore, the steam flow distribution of the heat storage heater (2) and the heat network heater (3) is adjusted according to the real-time heat load demand, and the total amount of heat extraction steam does not exceed the maximum extraction capacity of the unit.

[0052] Specifically, the steam flow distribution between the heat storage heater (2) and the heat network heater (3) adopts a dynamic priority strategy. When the heat network heating demand is high, the steam distribution valve is adjusted to give priority to supplying more steam to the heat network heater (3) to meet the heating temperature requirements; when the power peak demand is urgent, the steam ratio of the heat storage heater (2) is increased, and the excess heat is stored in the hot water storage tank (1). The control system monitors the steam extraction main pressure of the unit in real time to ensure that the total steam flow of the two heaters does not exceed the maximum steam extraction capacity of the unit, thereby preventing unstable boiler operation caused by steam extraction overload. In addition, the steam distribution ratio is also adaptively adjusted according to the heat storage state of the hot water storage tank (1), for example, the steam flow of the heat storage heater (2) is automatically reduced when the tank is full.

[0053] Furthermore, when the temperature of the hot water layer of the hot water storage tank (1) is lower than a set threshold, it automatically switches to a heat storage mode to supplement heat energy; when the water supply temperature of the heating network is lower than the heating requirement, it automatically starts a heat release mode to supplement heat.

[0054] Specifically, the system sets an intelligent temperature threshold trigger mechanism. When the temperature of the hot water layer above the hot water storage tank (1) is lower than the set value (such as 90°C), the heat storage mode is automatically activated, and heat is supplemented by the heat storage heater (2) until the temperature returns to a safe range. When the water supply temperature of the heating network drops below the heating standard (such as 70°C) due to a sudden change in load or a reduction in the unit output, the control system immediately switches to the heat release mode, using the heat stored in the hot water storage tank (1) to heat the bypass return water to maintain the heating quality. This automatic switching logic is implemented through multiple temperature sensors and a PLC controller, with a response delay of less than 10 seconds. In addition, during the mode conversion process, hydraulic shock is avoided through gradual adjustment of the valve, ensuring a smooth transition of the system.

[0055] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present disclosure, and should all be included in the scope of protection of the present disclosure.

Claims

1. An adjustable steam extraction frequency modulation and peak regulation system based on a hot water storage tank, characterized in that: The invention comprises a hot water storage tank (1), a heat storage heater (2), a heat network heater (3), a heat release heater (4), a heat network circulation pump (5), a heat storage pump (6), first to sixth switch valves (7-12), a heat storage regulating valve (13), a heat release regulating valve (15), a water pumping switch valve (14) and a booster pump (16), wherein: The inlet of the heating network circulation pump (5) is connected to the heating network return pipe, and the outlet is connected to the cold side inlet of the heating network heater (3); The hot water storage tank (1) is connected in sequence to the first switch valve (7), the heat storage pump (6), the third switch valve (9) and the heat release regulating valve (15) via a hot water pipeline to the hot side inlet of the heat release heater (4); the hot side outlet of the heat release heater (4) is connected to the hot water storage tank (1) via a fifth switch valve (11); The hot water storage tank (1) is connected in sequence to the second switch valve (8), the heat storage pump (6), and the fourth switch valve (10) via a cold water pipeline to the cold side inlet of the heat storage heater (2); the cold side outlet of the heat storage heater (2) is connected to the hot water storage tank (1) via the heat storage regulating valve (13) and the sixth switch valve (12); The cold side inlet of the exothermic heater (4) is connected to the inlet pipeline of the heat network circulation pump (5) via a pumping switch valve (14), and the cold side outlet is connected to the outlet pipeline of the heat network circulation pump (5) via a booster pump (16); The hot side inlets of the heat storage heater (2) and the heat network heater (3) are connected in parallel to the steam supply and extraction pipelines of the unit, and the hot side outlet drain pipelines are connected to the condenser after merging.

2. The system according to claim 1, wherein: The heat storage pump (6) is simultaneously arranged in the hot water pipeline and the cold water pipeline, and the water flow direction is switched by the opening and closing states of the first switch valve (7), the second switch valve (8), the third switch valve (9), and the fourth switch valve (10).

3. The system according to claim 1, wherein: The cold side pipeline of the exothermic heater (4) and the heat network circulation pump (5) form a parallel loop, and the lift of the booster pump (16) is configured to overcome the resistance of the exothermic heater (4) and the pipeline.

4. A method for operating the system according to any one of claims 1 to 3, characterized in that: The following modes are included: Heat storage mode: close the first switch valve (7), the third switch valve (9), the fifth switch valve (11), the water pumping switch valve (14) and the heat release regulating valve (15), open the second switch valve (8), the fourth switch valve (10), the sixth switch valve (12) and the heat storage regulating valve (13), and drive the cold water to circulate between the heat storage heater (2) and the hot water storage tank (1) through the heat storage pump (6) to store heat; Heat release mode: the second switch valve (8), the fourth switch valve (10), the sixth switch valve (12) and the heat storage regulating valve (13) are closed, and the first switch valve (7), the third switch valve (9), the fifth switch valve (11), the pumping switch valve (14) and the heat release regulating valve (15) are opened, and the hot water is driven by the heat storage pump (6) to circulate between the heat release heater (4) and the hot water storage tank (1) to release heat; Frequency modulation mode: Based on the heat storage mode, the opening of the heat storage regulating valve (13) is dynamically adjusted to change the heat exchange amount of the heat storage heater (2), and the unit load is quickly adjusted by changing the steam extraction amount.

5. The method according to claim 4, characterized in that In the frequency modulation mode, when the unit load needs to be increased, the opening of the heat storage regulating valve (13) is reduced to reduce the heat storage flow rate; when the load needs to be reduced, the opening of the heat storage regulating valve (13) is increased to increase the heat storage flow rate.

6. The method according to claim 4, characterized in that In the heat release mode, the booster pump (16) and the heat network circulation pump (5) operate in coordination, and the return water flow of the bypass heat network is controlled by adjusting the opening of the pumping switch valve (14).

7. The method according to claim 4, characterized in that The heat storage mode and the heat release mode can be operated simultaneously, and parallel operation of heat storage and release can be achieved by independently controlling the cold water circulation loop and the hot water circulation loop.

8. The method according to claim 4, characterized in that The steam flow distribution of the heat storage heater (2) and the heat network heater (3) is adjusted according to the real-time heat load demand, and the total amount of heat extraction steam does not exceed the maximum steam extraction capacity of the unit.

9. The method according to claim 4, characterized in that When the temperature of the hot water layer in the hot water storage tank (1) is lower than a set threshold, it automatically switches to a heat storage mode to supplement heat energy; when the water supply temperature of the heating network is lower than the heating requirement, it automatically starts a heat release mode to supplement heat.

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