A heat storage and energy storage device for boiler steam peak regulation

Abstract

The utility model discloses a kind of heat storage energy storage devices for boiler steam peak shaving, including boiler, first heat exchanger, low-temperature storage tank, high-temperature storage tank, second heat exchanger, cooling water system, user heating system, heat preservation heating system and control system;The heat preservation heating system is connected with high-temperature storage tank, and the controlled end of heat preservation heating system is connected with the output end of control system;The utility model is stored by setting heat storage module and heat release module, realizes steam heat in boiler in electricity low valley section, stored heat is supplied to user heating system with the steam heat of boiler itself in electricity peak section, to reduce the load of electricity peak section boiler heating unit, simultaneously, heat preservation heating system to high-temperature medium in low valley period, avoid heat loss, improve the boiler operation effect, realize the optimized use of energy, reach energy-saving effect.

Description

Technical Field

[0001] This utility model relates to the field of boiler technology, specifically to a thermal energy storage device for boiler steam peak regulation. Background Technology

[0002] Boiler steam peak shaving refers to adjusting the boiler's steam output to adapt to changes in the power system's load and ensure the stable operation of the power grid. Specifically, during off-peak hours, the steam discharged from the boiler during low-load operation is stored, and then the stored heat energy is released during peak hours to reduce the self-consumption of steam in the boiler deaerator and maximize the boiler's heating capacity. Currently, boiler steam peak shaving is usually achieved using accumulators. There are various types of accumulators, which mainly store heat energy by exchanging heat with boiler steam. This method can effectively utilize the boiler steam energy to achieve boiler steam peak shaving. However, because some heat is lost within the accumulator, especially in cold winter conditions, the boiler unit load is not significantly reduced during peak hours, and it does not effectively coordinate with the off-peak electricity conditions of the power grid to achieve peak shaving and valley filling to reduce energy consumption. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a thermal energy storage device for boiler steam peak regulation, which can buffer the load of the unit during boiler operation in conjunction with the power grid operation status, improve boiler operating efficiency, and effectively save energy.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows.

[0005] A boiler steam peak-shaving thermal energy storage device includes a boiler, a first heat exchanger, a low-temperature storage tank, a high-temperature storage tank, a second heat exchanger, a cooling water system, a user heating system, a thermal insulation and heating system for insulating and heating the medium in the high-temperature storage tank during off-peak electricity hours, and a control system. The heat outlets of the boiler and the second heat exchanger are respectively connected to the user heating system. The boiler, low-temperature storage tank, first heat exchanger, and high-temperature storage tank constitute a thermal storage module, and the cooling water system, high-temperature storage tank, second heat exchanger, and low-temperature storage tank constitute a heat release module. The thermal insulation and heating system is connected to the high-temperature storage tank, and the controlled end of the thermal insulation and heating system is connected to the output end of the control system.

[0006] In the aforementioned boiler steam peak-shaving thermal energy storage device, the boiler's steam outlet is connected to the steam inlet of the first heat exchanger via a first pipeline, the first heat exchanger's steam outlet is connected to a second pipeline, the low-temperature medium outlet of the low-temperature storage tank is connected to the first heat exchanger via a third pipeline, and the first heat exchanger's high-temperature medium outlet is connected to the high-temperature medium inlet of the high-temperature storage tank via a fourth pipeline.

[0007] The above-mentioned boiler steam peak-shaving thermal energy storage device has a boiler steam switch valve installed on the first pipeline, and the controlled end of the boiler steam switch valve is connected to the output end of the control system.

[0008] The above-mentioned boiler steam peak-shaving thermal energy storage device has a steam thermometer installed on the second pipeline near the steam outlet of the first heat exchanger, and the output end of the steam thermometer is connected to the input end of the control system; a steam discharge valve is installed on the second pipeline, and the controlled end of the steam discharge valve is connected to the output end of the control system.

[0009] The above-mentioned boiler steam peak-shaving thermal energy storage device has a second pipeline located between the steam thermometer and the steam discharge valve, which is connected to the first pipeline through a circulation pipeline. A steam circulation switch valve is installed on the circulation pipeline, and the controlled end of the steam circulation switch valve is connected to the output end of the control system.

[0010] The above-mentioned boiler steam peak-shaving thermal energy storage device includes a low-temperature medium switching valve and a first circulating pump on the third pipeline. The controlled ends of the low-temperature medium switching valve and the first circulating pump are respectively connected to the output end of the control system.

[0011] In the aforementioned boiler steam peak-shaving thermal energy storage device, in the heat release module, the high-temperature medium outlet of the high-temperature storage tank is connected to the hot inlet end of the second heat exchanger through the fifth pipeline, the cold outlet end of the second heat exchanger is connected to the low-temperature medium inlet of the low-temperature storage tank through the sixth pipeline, and the cooling water system is connected to the cold inlet end of the second heat exchanger through the seventh pipeline.

[0012] The above-mentioned boiler steam peak-shaving thermal energy storage device includes a high-temperature medium switching valve and a second circulation pump on the fifth pipeline. The controlled ends of the high-temperature medium switching valve and the second circulation pump are respectively connected to the output end of the control system.

[0013] The above-mentioned boiler steam peak-shaving thermal energy storage device includes a high-temperature medium thermometer installed on the high-temperature storage tank to detect the temperature of the internal high-temperature medium. The output end of the high-temperature medium thermometer is connected to the input end of the control system.

[0014] The above-mentioned boiler steam peak-shaving thermal energy storage device includes a pressure gauge installed on the boiler, the output end of which is connected to the input end of the control system.

[0015] Due to the adoption of the above technical solutions, the technological progress achieved by this utility model is as follows.

[0016] This utility model provides a thermal energy storage device for boiler steam peak regulation. By setting up a thermal storage module and a heat release module, it enables the storage of steam heat in the boiler during off-peak electricity consumption periods. During peak electricity consumption periods, the stored heat, along with the boiler's own steam heat, is supplied to the user's heating system, thereby reducing the load on the boiler heating unit during peak electricity consumption periods. At the same time, during off-peak periods, the high-temperature medium is heated and kept warm through an insulation and heating system to avoid heat loss, improve boiler operating efficiency, optimize energy utilization, and achieve energy-saving effects. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the specific structure of this utility model.

[0018] The components are: 1. Boiler, 2. First heat exchanger, 3. Low-temperature storage tank, 4. High-temperature storage tank, 5. Second heat exchanger, 6. Cooling water system, 7. User heating system, 8. Pressure gauge, 9. Boiler steam switch valve, 10. Steam thermometer, 11. Low-temperature steam discharge valve, 12. Steam circulation switch valve, 13. Low-temperature medium switch valve, 14. High-temperature medium switch valve, 15. High-temperature medium thermometer, and 16. Insulation and heating system. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] A thermal energy storage device for boiler steam peak regulation, such as Figure 1 As shown, the system includes a boiler 1, a first heat exchanger 2, a low-temperature storage tank 3, a high-temperature storage tank 4, a second heat exchanger 5, a cooling water system 6, a user heating system 7, a heat preservation and heating system 16, and a control system. The heat outlets of the boiler 1 and the second heat exchanger 5 are connected to the user heating system 7. The boiler 1, the low-temperature storage tank 3, the first heat exchanger 2, and the high-temperature storage tank 4 constitute a heat storage module. The cooling water system 6, the high-temperature storage tank 4, the second heat exchanger 5, and the low-temperature storage tank 3 constitute a heat release module. The heat preservation and heating system 16 is connected to the high-temperature storage tank 4 and is used to heat and preserve the medium in the high-temperature storage tank 4 during off-peak electricity hours. The controlled end of the heat preservation and heating system 16 is connected to the output end of the control system.

[0021] A pressure gauge 8 is installed on the boiler 1 to detect the steam pressure inside the boiler in order to control the steam discharge. The output end of the pressure gauge 8 is connected to the input end of the control system.

[0022] In the heat storage module, the steam outlet of boiler 1 is connected to the steam inlet of first heat exchanger 2 through a first pipeline, the steam outlet of first heat exchanger 2 is connected to a second pipeline, the low-temperature medium outlet of low-temperature storage tank 3 is connected to first heat exchanger 2 through a third pipeline, and the high-temperature medium outlet of first heat exchanger 2 is connected to high-temperature medium inlet of high-temperature storage tank 4 through a fourth pipeline.

[0023] A boiler steam switch valve 9 is installed on the first pipeline. The controlled end of the boiler steam switch valve 9 is connected to the output end of the control system. It is used to discharge boiler steam into the first heat exchanger 2 after the steam pressure in the boiler reaches a certain value.

[0024] A steam thermometer 10 is installed on the second pipeline near the steam outlet of the first heat exchanger 2 to measure the temperature of the discharged low-temperature steam in order to determine whether the steam can be discharged. The output end of the steam thermometer 10 is connected to the input end of the control system.

[0025] A steam discharge valve 11 is installed on the second pipeline. The controlled end of the steam discharge valve 11 is connected to the output end of the control system and is used to discharge low-temperature steam.

[0026] The second pipeline located between the steam thermometer 10 and the steam discharge valve 11 is connected to the first pipeline through a circulation pipeline. A steam circulation switch valve 12 is installed on the circulation pipeline, and the controlled end of the steam circulation switch valve 12 is connected to the output end of the control system.

[0027] The third pipeline is equipped with a cryogenic medium switching valve 13 and a first circulation pump. The controlled ends of the cryogenic medium switching valve 13 and the first circulation pump are respectively connected to the output end of the control system and are used to deliver cryogenic medium into the first heat exchanger 2.

[0028] In the heat release module, the high-temperature medium outlet of the high-temperature storage tank 4 is connected to the hot inlet end of the second heat exchanger 5 through the fifth pipeline, the cold outlet end of the second heat exchanger 5 is connected to the low-temperature medium inlet of the low-temperature storage tank 3 through the sixth pipeline, and the cooling water system 6 is connected to the cold inlet end of the second heat exchanger 5 through the seventh pipeline.

[0029] The fifth pipeline is equipped with a high-temperature medium switching valve 14 and a second circulation pump. The controlled ends of the high-temperature medium switching valve 14 and the second circulation pump are respectively connected to the output end of the control system and are used to deliver high-temperature medium into the second heat exchanger 5.

[0030] The high-temperature storage tank 4 is equipped with a high-temperature medium thermometer 15 for detecting the temperature of the internal high-temperature medium. The output terminal of the high-temperature medium thermometer 15 is connected to the input terminal of the control system.

[0031] During off-peak electricity hours, when the high-temperature medium thermometer 15 detects that the temperature of the high-temperature medium is below a certain value, it sends a signal to the control system. The heat preservation and heating system 16 then heats the medium in the high-temperature storage tank 4 to meet the subsequent heat release requirements, thereby reducing the unit's workload during peak electricity hours.

[0032] The heat preservation and heating system 16 is connected to a timer, and the output of the timer is connected to the input of the control system. The time is set to the off-peak period of electricity consumption, so that the heat preservation and heating system 16 can work during the off-peak period and not work during other periods.

[0033] Specifically, during off-peak hours, the boiler discharges steam into the first heat exchanger for heat exchange while operating at low load. The high-temperature medium after heat exchange is then stored in a high-temperature storage tank. At the same time, a high-temperature medium thermometer monitors the temperature of the medium inside the high-temperature storage tank in real time to control the temperature of the high-temperature medium to remain above the set minimum temperature value, so that heat can be released during peak hours to meet electricity demand and reduce the unit's workload during peak hours.

[0034] During peak electricity consumption periods, all the steam generated by the boiler is used to supply the user's heating system. Simultaneously, the high-temperature medium in the high-temperature storage tank and the cold water in the cooling water system exchange heat through a second heat exchanger, and the resulting hot steam is also sent to the user's heating system. This not only reduces the load on the boiler heating unit but also makes rational use of the peak and off-peak electricity flow of the power grid, achieving optimized energy utilization and energy-saving effects.

[0035] This utility model provides a thermal energy storage device for boiler steam peak regulation. By setting up a thermal storage module and a heat release module, it enables the storage of steam heat in the boiler during off-peak electricity consumption periods. During peak electricity consumption periods, the stored heat, along with the boiler's own steam heat, is supplied to the user's heating system, thereby reducing the load on the boiler heating unit during peak electricity consumption periods. At the same time, during off-peak periods, the high-temperature medium is heated and kept warm through an insulation and heating system to avoid heat loss, improve boiler operating efficiency, optimize energy utilization, and achieve energy-saving effects.

Claims

1. A thermal energy storage device for boiler steam peak regulation, characterized in that: The system includes a boiler (1), a first heat exchanger (2), a low-temperature storage tank (3), a high-temperature storage tank (4), a second heat exchanger (5), a cooling water system (6), a user heating system (7), a heat preservation and heating system (16) for heat preservation and heating of the medium in the high-temperature storage tank (4) during off-peak electricity hours, and a control system; the heat outlet ends of the boiler (1) and the second heat exchanger (5) are respectively connected to the user heating system (7); wherein the boiler (1), the low-temperature storage tank (3), the first heat exchanger (2), and the high-temperature storage tank (4) constitute a heat storage module, and the cooling water system (6), the high-temperature storage tank (4), the second heat exchanger (5), and the low-temperature storage tank (3) constitute a heat release module; the heat preservation and heating system (16) is connected to the high-temperature storage tank (4), and the controlled end of the heat preservation and heating system (16) is connected to the output end of the control system.

2. The boiler steam peak-shaving thermal energy storage device according to claim 1, characterized in that: In the heat storage module, the steam outlet of the boiler (1) is connected to the steam inlet of the first heat exchanger (2) through the first pipeline, the steam outlet of the first heat exchanger (2) is connected to the second pipeline, the low temperature medium outlet of the low temperature storage tank (3) is connected to the first heat exchanger (2) through the third pipeline, and the high temperature medium outlet of the first heat exchanger (2) is connected to the high temperature medium inlet of the high temperature storage tank (4) through the fourth pipeline.

3. The boiler steam peak-shaving thermal energy storage device according to claim 2, characterized in that: A boiler steam switch valve (9) is installed on the first pipeline, and the controlled end of the boiler steam switch valve (9) is connected to the output end of the control system.

4. A boiler steam peak-shaving thermal energy storage device according to claim 2, characterized in that: A steam thermometer (10) is installed on the second pipeline near the steam outlet of the first heat exchanger (2), and the output end of the steam thermometer (10) is connected to the input end of the control system; a steam discharge valve (11) is installed on the second pipeline, and the controlled end of the steam discharge valve (11) is connected to the output end of the control system.

5. A boiler steam peak-shaving thermal energy storage device according to claim 4, characterized in that: The second pipeline located between the steam thermometer (10) and the steam discharge valve (11) is connected to the first pipeline through a circulation pipeline. A steam circulation switch valve (12) is installed on the circulation pipeline. The controlled end of the steam circulation switch valve (12) is connected to the output end of the control system.

6. A boiler steam peak-shaving thermal energy storage device according to claim 2, characterized in that: The third pipeline is equipped with a cryogenic medium switching valve (13) and a first circulating pump. The controlled ends of the cryogenic medium switching valve (13) and the first circulating pump are respectively connected to the output end of the control system.

7. A boiler steam peak-shaving thermal energy storage device according to claim 1, characterized in that: In the heat release module, the high temperature medium outlet of the high temperature storage tank (4) is connected to the hot inlet end of the second heat exchanger (5) through the fifth pipeline, the cold outlet end of the second heat exchanger (5) is connected to the low temperature medium inlet of the low temperature storage tank (3) through the sixth pipeline, and the cooling water system (6) is connected to the cold inlet end of the second heat exchanger (5) through the seventh pipeline.

8. A boiler steam peak-shaving thermal energy storage device according to claim 7, characterized in that: The fifth pipeline is equipped with a high-temperature medium switching valve (14) and a second circulation pump. The controlled ends of the high-temperature medium switching valve (14) and the second circulation pump are respectively connected to the output end of the control system.

9. A thermal energy storage device for boiler steam peak regulation according to claim 1, characterized in that: The high-temperature storage tank (4) is equipped with a high-temperature medium thermometer (15) for detecting the temperature of the internal high-temperature medium. The output end of the high-temperature medium thermometer (15) is connected to the input end of the control system.

10. A boiler steam peak-shaving thermal energy storage device according to claim 1, characterized in that: A pressure gauge (8) is installed on the boiler (1), and the output end of the pressure gauge (8) is connected to the input end of the control system.

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