Peak shaving system

Abstract

The utility model relates to a peak shaving system which comprises a boiler steam supply loop, and a boiler and a thermoelectric unit used for being connected with a power grid are sequentially connected to the boiler steam supply loop. The heat supply network water supply loop is connected with a heat supply network; the first heat exchanger is respectively connected with the boiler steam supply loop and the heat supply network water supply loop, so that the boiler steam supply loop and the heat supply network water supply loop can exchange heat through the first heat exchanger; the boiler steam supply loop selectively communicates with the heat storage assembly, so that the heat storage assembly and the boiler steam supply loop can exchange heat; and the second heat exchanger is connected with the heat storage assembly and selectively communicates with the heat supply network water supply loop, so that the heat supply network water supply loop and the heat storage assembly can exchange heat. The heat storage assembly can store heat when the heat load of the heat user is low and release heat when the heat load of the heat user is high, the adjusting capacity of the peak regulation system is improved, energy waste is reduced, and economical efficiency is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of electric power technology, and in particular to a peak load regulation system. Background Art

[0002] The existing boiler units have high comprehensive thermal efficiency, but the independence of thermal power supply is poor, and the power generation of the units is subject to changes in thermal load. When the thermal load increases, the electrical load that the unit can bear decreases, and when the thermal load decreases, the electrical load that the unit can bear increases. The changes in thermal load and electrical load are highly synchronized and opposite. In production work, part of the steam is extracted from the unit to meet the heating needs of thermal users, and the remaining steam is used to generate power. Therefore, the power generation of the unit directly depends on the size of the thermal load, and the thermal load is closely related to factors such as season and temperature, so the power generation of the unit has a strong seasonal change. Since electrical energy cannot be stored in large quantities, the generation and use of electrical energy are synchronized. The power generation department will generate as much electricity as needed. If the power generated by the unit is not used by the power user, the excess power cannot be stored and will be wasted. The power load in the power system changes frequently. In order to maintain the balance of active power and keep the system frequency stable, the power generation department needs to change the power supply situation accordingly to adapt to the changes in the power load. Utility Model Content

[0003] The purpose of the present disclosure is to provide a peak load regulation system to regulate the energy of a power grid and reduce energy waste.

[0004] In order to achieve the above object, the present disclosure provides a peak load shaving system, comprising:

[0005] A boiler steam supply circuit, to which a boiler and a thermal power unit for connecting to a power grid are sequentially connected;

[0006] Heating network water supply loop, used to connect to the heating network;

[0007] A first heat exchanger, wherein the first heat exchanger is connected to the boiler steam supply circuit and the heating network water supply circuit respectively, and can enable the boiler steam supply circuit and the heating network water supply circuit to exchange heat through the first heat exchanger;

[0008] a heat storage component, the boiler steam supply circuit being selectively connected to the heat storage component, so that the heat storage component and the boiler steam supply circuit can exchange heat; and

[0009] The second heat exchanger is connected to the heat storage component and selectively conducts the heat network water supply circuit to enable the heat network water supply circuit and the heat storage component to exchange heat.

[0010] Optionally, the boiler steam supply circuit includes:

[0011] A main steam supply path, to which the boiler and the thermal power unit are sequentially connected; and

[0012] The steam supply branch can be connected to the steam supply main circuit in an openable and closable manner, and the steam supply branch is connected to the heat storage component, wherein the boiler steam supply circuit is configured as follows:

[0013] The main steam supply path is directly connected, or the main steam supply path is connected through the steam supply branch path.

[0014] Optionally, the heating network water supply circuit includes:

[0015] a main water supply line connected to the first heat exchanger; and

[0016] The water supply branch line is openably and closably connected to the water supply main line and is connected to the second heat exchanger.

[0017] Optionally, two connection points between the water supply branch and the water supply main line are respectively located on both sides of the first heat exchanger.

[0018] Optionally, the heat storage component includes:

[0019] a heat storage element, the heat storage element selectively communicating with the boiler steam supply circuit; and

[0020] A circulation pipeline, in which a heat storage medium flows, and the heat storage element and the second heat exchanger are sequentially arranged on the circulation pipeline.

[0021] Optionally, the heat storage element is a rock bed.

[0022] Optionally, a circulating water pump is also provided on the circulating pipeline.

[0023] Optionally, the thermal power unit comprises:

[0024] a steam turbine connected to the boiler steam supply circuit; and

[0025] The generator is used to connect to a power grid, and the generator is coaxially connected to the steam turbine.

[0026] Optionally, there are multiple steam turbines and multiple generators, and they are arranged in one-to-one correspondence.

[0027] Optionally, the peak shaving system further includes a controller, the boiler steam supply circuit is provided with a first valve capable of connecting the boiler steam supply circuit with the heat storage component, the heating network water supply circuit is provided with a second valve capable of connecting the heating network water supply circuit with the second heat exchanger, the controller is connected to the first valve and the second valve respectively, and the peak shaving system can be configured as follows:

[0028] In a first state, the first valve is open, the second valve is closed, and the boiler steam supply circuit is connected to the heat storage component; and

[0029] In the second state, the first valve is closed, the second valve is opened, and the heating network water supply circuit is connected to the second heat exchanger.

[0030] Through the above technical solution, it is selected whether the boiler steam supply circuit is connected to the first heat exchanger and the heat storage component for heat exchange and heat storage according to the load of the power grid and the heat network load, and whether the heat network water supply circuit is connected to the second heat exchanger so that the heat storage component exchanges heat with the heat network water supply circuit for heat release. The heat storage component can store heat when the heat load of the heat user is low, and release heat when the heat load of the heat user is high, which improves the regulation capacity of the peak load regulation system, decouples the heat load and the electric load, improves the disadvantage of highly synchronous and reverse changes of the two, and improves the independence of thermal power supply. The heat storage component stores or supplies heat according to the size of the heat load, and can also flexibly adjust the heating capacity, reduce energy waste, and improve economy.

[0031] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0033] Figure 1 is a schematic diagram of a peak shaving system according to an embodiment of the present disclosure.

[0034] Figure 2 It is a schematic diagram of a first state of a peak shaving system according to an embodiment of the present disclosure.

[0035] Figure 3 It is a schematic diagram of a second state of a peak shaving system according to an embodiment of the present disclosure.

[0036] Description of Reference Numerals

[0037] 1- boiler steam supply circuit; 11- boiler; 12- thermal power unit; 121- steam turbine; 122- generator; 13- main steam supply line; 14- steam supply branch line; 2- heating network water supply circuit; 201- heating network return water end; 202- heating network water supply end; 21- main water supply line; 22- water supply branch line; 3- first heat exchanger; 4- heat storage component; 41- heat storage component; 42- circulation pipeline; 421- circulation water pump; 5- second heat exchanger. DETAILED DESCRIPTION

[0038] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0039] In the present disclosure, unless otherwise specified, directional words such as "inner" and "outer" are defined with respect to the outline of the corresponding component. The use of the terms "first", "second", etc. is intended to distinguish different components and does not have order and importance. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same reference numerals in different drawings represent the same or similar elements.

[0040] According to one embodiment of the present disclosure, Figures 1 to 3 As shown, a peak load regulation system is provided, which may include a boiler steam supply circuit 1, a heat network water supply circuit 2, a first heat exchanger 3, a heat storage component 4, and a second heat exchanger 5. The boiler steam supply circuit 1 may be connected in sequence with a boiler 11 and a thermal power unit 12 for connecting to a power grid, and the heat network water supply circuit 2 may be used to connect to a heat network. The first heat exchanger 3 may be connected to the boiler steam supply circuit 1 and the heat network water supply circuit 2, respectively, so that the boiler steam supply circuit 1 and the heat network water supply circuit 2 may exchange heat through the first heat exchanger 3. The boiler steam supply circuit 1 is selectively connected to the heat storage component 4, so that the heat storage component 4 and the boiler steam supply circuit 1 may exchange heat. The second heat exchanger 5 is connected to the heat storage component 4, and selectively connected to the heat network water supply circuit 2, so that the heat network water supply circuit 2 and the heat storage component 4 may exchange heat. Here, the thermal power unit 12 may be a high back pressure heating unit, which is not limited in the present disclosure.

[0041] Through the above technical solution, it is selected whether the boiler steam supply loop 1 is connected to the first heat exchanger 3 and the heat storage component 4 for heat exchange and heat storage according to the load of the power grid and the load of the heat network, and whether the heat network water supply loop 2 is connected to the second heat exchanger 5 so that the heat storage component 4 exchanges heat with the heat network water supply loop 2 for heat release. The heat storage component 4 can store heat when the heat load of the heat user is low, and release heat when the heat load of the heat user is high, thereby improving the regulation capacity of the peak load regulation system, decoupling the heat load and the electric load, improving the disadvantage of the highly synchronous and reverse changes of the two, and improving the independence of the thermal power supply. The heat storage component 4 stores or supplies heat according to the size of the heat load, and can also flexibly adjust the heating capacity, reduce energy waste, and improve economy.

[0042] Furthermore, if Figure 1As shown, the boiler steam supply circuit 1 includes a main steam supply line 13 and a steam supply branch line 14, the boiler 11 and the thermal power unit 12 are connected to the main steam supply line 13 in sequence, the steam supply branch line 14 can be opened and closed and is connected to the main steam supply line 13, and the steam supply branch line 14 is connected to the heat storage component 4, wherein the boiler steam supply circuit 1 is configured to be directly connected to the main steam supply line 13, or the main steam supply line 13 is connected through the steam supply branch line 14. In this way, when the boiler steam supply circuit 1 is directly connected to the main steam supply line 13, that is, at this time, the boiler steam supply circuit 1 is not connected to the heat storage component 4, and does not exchange heat with the heat storage component 4, when the main steam supply line 13 is connected to the steam supply branch line 14, the steam flowing out of the boiler 11 first flows through the main steam supply line 13, and then exchanges heat with the heat storage component 4 through the steam supply branch line 14, and then flows to the main steam supply line 13 and then flows back to the boiler 11. A three-way valve connected to a controller may be connected to the connection between the main steam supply line 13 and the steam supply branch line 14 to control the conduction between the main steam supply line 13 and the steam supply branch line 14. An electric valve may also be provided on the steam supply branch line 14 to control the opening and closing of the steam supply branch line 14. The present disclosure does not limit this.

[0043] According to one embodiment of the present disclosure, Figure 1 and Figure 3 As shown, the heat network water supply circuit 2 may include a main water supply circuit 21 and a branch water supply circuit 22. The main water supply circuit 21 may be connected to the first heat exchanger 3 to exchange heat with the boiler steam supply circuit 1 through the first heat exchanger 3. The branch water supply circuit 22 may be openably and closably connected to the main water supply circuit 21 and connected to the second heat exchanger 5 to exchange heat with the heat storage component 4 through the second heat exchanger 5.

[0044] Furthermore, if Figure 1 and Figure 3 As shown, the two connection points of the water supply branch 22 and the water supply main road 21 are respectively located on both sides of the first heat exchanger 3. In the water supply loop 2 of the heating network, the water from the return water end 201 of the heating network is divided into two streams before entering the first heat exchanger 3, and enters the water supply main road 21 and the water supply branch 22 respectively. The water of the water supply main road 21 exchanges heat with the boiler steam supply loop 1 through the first heat exchanger 3 and flows out of the first heat exchanger 3. The water of the water supply branch 22 exchanges heat with the heat storage component 4 through the second heat exchanger 5 and flows out of the second heat exchanger 5 and then merges with the water of the water supply main road 21 flowing out of the first heat exchanger 3, and finally flows to the heating network water supply end 202 to supply water to the heating network. Here, the two connection points of the water supply branch 22 and the water supply main road 21 can also be located on the same side of the first heat exchanger 3, can be located on the side close to the return water end 201 of the heating network, or can be located on the side close to the water supply end 202 of the heating network, and the present disclosure does not limit this.

[0045] According to one embodiment of the present disclosure, Figures 1 to 3As shown, the heat storage assembly 4 may include a heat storage element 41 and a circulation pipeline 42. The heat storage element 41 may be selectively connected to the boiler steam supply loop 1 to store redundant heat in the boiler steam supply loop 1. The circulation pipeline 42 may be sequentially provided with the heat storage element 41 and the second heat exchanger 5, so that the heat in the heat storage element 41 is transferred to the second heat exchanger 5 through the circulation pipeline 42, and heat is exchanged with the heat network water supply loop 2 through the second heat exchanger 5. It should be noted that the heat storage element 41 may be a rock bed, or a combination of a molten salt cold tank and a molten salt hot tank, which is not limited in the present disclosure.

[0046] Furthermore, if Figures 1 to 3 As shown, a heat storage medium flows in the circulation pipeline 42, and the heat storage medium can be water or other liquid medium that can quickly absorb and release heat, which is not limited in the present disclosure. A circulation water pump 421 can also be provided on the circulation pipeline 42 to make the heat storage medium in the circulation pipeline 42 flow, so as to accelerate the energy exchange between the circulation pipeline 42 and the heat network water supply loop 2.

[0047] According to one embodiment of the present disclosure, Figures 1 to 3 As shown, the thermal power unit 12 may include a steam turbine 121 and a generator 122. The steam turbine 121 may be connected to the boiler steam supply circuit 1, and the generator 122 may be used to connect to the power grid. The generator 122 is coaxially connected to the steam turbine 121. When the steam in the boiler steam supply circuit 1 passes through the steam turbine 121, the steam turbine 121 is driven to do work. The steam turbine 121 drives the coaxially connected generator 122 to generate electricity and transmit the electricity to the power grid. Here, there are multiple steam turbines 121 and generators 122, and they are set one by one. The specific number can be set according to the power generation demand, and this disclosure does not limit this.

[0048] According to an embodiment of the present disclosure, the peak shaving system may further include a controller, which may be a separate controller or a corresponding module of the power plant master control platform, and the present disclosure does not limit this. The boiler steam supply loop 1 may be provided with a first valve that enables the boiler steam supply loop 1 to be connected to the heat storage component 4, and the heat network water supply loop 2 may be provided with a second valve that enables the heat network water supply loop 2 to be connected to the second heat exchanger 5. The controller is connected to the first valve and the second valve, respectively, so that the peak shaving system can be configured in the first state and the second state.

[0049] In the first state, the first valve is open, the second valve is closed, and the boiler steam supply circuit 1 is connected to the heat storage component 4. This state is a state in which the boiler steam supply circuit 1 has a small heat load and a small electrical load. Figure 2As shown, at this time, the boiler steam supply circuit 1 is connected to the heat storage component 4. Since the amount of steam generated by the boiler 11 is constant, when the thermal load of the boiler steam supply circuit 1 is small and the electrical load is small, after the thermal power unit 12 supplies power to the grid and after the boiler steam supply circuit 1 supplies heat to the heat network water supply circuit 2, the redundant energy of the remaining steam is stored in the heat storage component 4 to ensure that the thermal power unit 12 maintains high-efficiency operation.

[0050] In the second state, the first valve is closed and the second valve is open. Figure 3 As shown, at this time, the heat network water supply loop 2 is connected to the second heat exchanger 5. At this time, the peak load of the peak load system may be large. At this time, the thermal power unit 12 can use different power generation powers according to the size of the electric load. The thermal power unit 12 and the heat storage component 4 need to jointly supply heat to meet the heat load requirements of the heat user, so as to obtain better heating and power supply effects. When the peak load of the peak load is large and the heat load is small, heat storage or heat supply can be performed according to the actual size of the electric load and the heat load. When the total amount of the electric load and the heat load exceeds the heat energy generated by the steam of the boiler 11, it is the second state at this time, and the heat storage component 4 releases heat. When the total amount of the electric load and the heat load does not exceed the heat energy generated by the steam of the boiler 11, it is the first state at this time, and the heat storage component 4 stores heat. Flexibly adjust the heating capacity, reduce energy waste, and improve economy. The first valve and the second valve can be electric butterfly valves or three-way valves, which are not limited in this disclosure.

[0051] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0052] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0053] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A peak load regulation system, characterized in that: include: A boiler steam supply circuit, to which a boiler and a thermal power unit for connecting to a power grid are sequentially connected; Heating network water supply loop, used to connect to the heating network; A first heat exchanger, wherein the first heat exchanger is connected to the boiler steam supply circuit and the heating network water supply circuit respectively, and can enable the boiler steam supply circuit and the heating network water supply circuit to exchange heat through the first heat exchanger; a heat storage component, the boiler steam supply circuit being selectively connected to the heat storage component, so that the heat storage component and the boiler steam supply circuit can exchange heat; and The second heat exchanger is connected to the heat storage component and selectively conducts the heat network water supply circuit to enable the heat network water supply circuit and the heat storage component to exchange heat.

2. The peak load shaving system according to claim 1, characterized in that: The boiler steam supply circuit comprises: A main steam supply path, to which the boiler and the thermal power unit are sequentially connected; and The steam supply branch can be connected to the steam supply main circuit in an openable and closable manner, and the steam supply branch is connected to the heat storage component, wherein the boiler steam supply circuit is configured as follows: The main steam supply path is directly connected, or the main steam supply path is connected through the steam supply branch path.

3. The peak load shaving system according to claim 1, characterized in that: The heating network water supply circuit comprises: a main water supply line connected to the first heat exchanger; and The water supply branch line is openably and closably connected to the water supply main line and is connected to the second heat exchanger.

4. The peak load shaving system according to claim 3, characterized in that: The two connection points between the water supply branch and the water supply main road are respectively located on both sides of the first heat exchanger.

5. The peak load shaving system according to claim 1, characterized in that: The heat storage component comprises: a heat storage element, the heat storage element selectively communicating with the boiler steam supply circuit; and A circulation pipeline, in which a heat storage medium flows, and the heat storage element and the second heat exchanger are sequentially arranged on the circulation pipeline.

6. The peak load shaving system according to claim 5, characterized in that: The heat storage element is a rock bed.

7. The peak load shaving system according to claim 5, characterized in that: The circulation pipeline is also provided with a circulation water pump.

8. The peak load shaving system according to claim 1, characterized in that: The thermal power unit comprises: a steam turbine connected to the boiler steam supply circuit; and The generator is used to connect to a power grid, and the generator is coaxially connected to the steam turbine.

9. The peak load shaving system according to claim 8, characterized in that: There are multiple steam turbines and generators, which are arranged in one-to-one correspondence.

10. The peak load shaving system according to any one of claims 1 to 9, characterized in that: The peak shaving system further includes a controller, a first valve capable of connecting the boiler steam supply circuit with the heat storage component is provided on the boiler steam supply circuit, a second valve capable of connecting the heating network water supply circuit with the second heat exchanger is provided on the heating network water supply circuit, the controller is connected to the first valve and the second valve respectively, and the peak shaving system can be configured as follows: In a first state, the first valve is open, the second valve is closed, and the boiler steam supply circuit is connected to the heat storage component; and In the second state, the first valve is closed, the second valve is opened, and the heating network water supply circuit is connected to the second heat exchanger.

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