Heat storage system for heat supply peak regulation
By transporting the hot water from the upper part of the heat storage tank to the hot network return pipe during the heat release stage, the lower fluid pressure in the hot network return pipe is used to solve the problem of high energy consumption and operation costs of the existing heat storage system, and the energy consumption and cost reduction is achieved.
Patent Information
- Application Number
- CN202422600674.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-10-25
AI Technical Summary
The existing heating peak-shaving and heating storage system has high energy consumption and operating costs, mainly because the heat-discharge water pump requires a higher head to transport hot water to the hot network water supply pipeline, resulting in large power consumption of the water pump motor.
A heat storage system is designed to reduce energy consumption by transporting hot water from the upper part of the heat storage tank to the heat grid return pipe instead of the heat grid water supply pipe during the heat release stage, and to reduce energy consumption and cost by optimizing the pipeline arrangement through a shared pipeline.
It reduces the power consumption and equipment cost of the water pump, and reduces the energy consumption and operating costs of the heat storage system.
Smart Images
Figure CN223258270U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of thermal power plant heating systems, in particular to a heat storage system for heating peak regulation. Background Art
[0002] In order to achieve the purpose of peak-shaving heat supply in thermal power plants, thermal power plants are currently carrying out cylinder-cutting heating transformation. The basic principle is to install shut-off valves with good airtightness on the steam pipes of the medium and low-pressure cylinders. When the unit is running, the valves on the steam pipes are closed, and the low-pressure cylinder does not enter steam, that is, the low-pressure cylinder is cut off for operation. The exhaust steam from the medium-pressure cylinder is basically all supplied to the outside for heat, reducing the unit's cold source loss and the unit's coal consumption rate for power generation. Under the same boiler heat load conditions, the unit's heating capacity can be improved; under the condition of unchanged heat supply, the unit's power generation power can be reduced to a certain extent, achieving the purpose of deep peak-shaving.
[0003] Currently, a heat storage system is typically deployed during cylinder-cutting retrofits to achieve matching peak load regulation with heat supply. Existing heat storage systems for heat supply peak load regulation typically utilize hot water storage tanks, which are based on thermocline layer heat storage technology. The basic principle of the thermocline layer is to separate hot and cold media with a temperature gradient layer, that is, to simultaneously store both high and low temperature media within the same hot water storage tank. During heat storage, hot water from the heat network's supply pipe enters the upper water distributor, which delivers water at a uniform rate, preventing mixing of the hot and cold water layers within the heat storage tank. Simultaneously, an equal volume of low-temperature water at the bottom flows through the lower water distributor into the heat network's return pipe. During this process, the thermocline layer gradually descends from top to bottom within the hot water storage tank until it completely disappears. At this point, the tank is filled entirely with hot water, and the heat storage process is complete. Similarly, when the hot water storage tank releases heat, the hot water on the upper part of the hot water storage tank enters the heating network for water supply, and the return water from the heating network enters the lower water distributor. At the same time, the inclined temperature layer moves upward. During the process, the inclined temperature layer gradually rises from bottom to top in the hot water storage tank until it completely disappears. At this time, the tank is full of low-temperature return water from the heating network, and the heat release process ends.
[0004] Existing thermal storage systems typically utilize a heat discharge water pump to discharge hot water from the thermal storage tank into the heating network water supply pipeline. This process requires the heat discharge water pump to have a sufficient head to connect the hot water at normal pressure in the thermal storage tank to the heating network water supply pipeline with a larger water pressure head. This high head requirement for the heat discharge water pump results in a large power consumption of the water pump motor, which increases system power consumption and costs.
[0005] Therefore, there is an urgent need for a heat storage system with low energy consumption and operating costs. Utility Model Content
[0006] The purpose of the utility model is to overcome the technical problem of high energy consumption of heat storage systems in the prior art and to provide a heat storage system for heat supply peak regulation, which has the advantages of low energy consumption and operating costs.
[0007] In order to achieve the above-mentioned objectives, the utility model provides a heat storage system for heat supply peak regulation, comprising: a heating network first station, the inlet and outlet of the heating network first station are respectively connected to the heating network return pipeline and the heating network water supply pipeline, and a heating network water pump is installed on the heating network return pipeline; a heat storage device, the heat storage device includes a hot water storage tank, and the hot water storage tank has an upper interface and a lower interface; a hot water pipeline, the hot water pipeline is used to connect the heating network water supply pipeline and the upper interface; a cold water pipeline, the cold water pipeline is used to connect the heating network return pipeline and the lower interface; a heat release pipeline, the heat release pipeline is used to connect the heating network return pipeline and the upper interface; and a heat storage pipeline, the heat storage pipeline is used to connect the heating network return pipeline and the lower interface.
[0008] Through the above technical solution, when the heat storage system is in normal heating mode, the heating network head station provides heating network water to the heat-consuming system through the heating network water supply pipeline. The heat network return water from the heat-consuming system is transported back to the heating network head station through the heating network return pipeline. After being heated at the heating network head station, it is again transported to the heat-consuming system. When the heat storage system is in heat storage-discharge mode, the hot water pipeline can be connected to the heating network water supply pipeline and the upper interface of the hot water storage tank, the cold water pipeline can be connected to the heating network return pipeline and the lower interface of the hot water storage tank, the heat release pipeline can be connected to the heating network return pipeline and the upper interface of the hot water storage tank, and the heat storage pipeline can be connected to the heating network return pipeline and the lower interface of the hot water storage tank. During the heat storage stage, the hot water in the heat network supply pipe flows into the upper part of the hot water storage tank through the hot water pipe, and at the same time, the cold water in the lower part of the hot water storage tank flows into the heat network return pipe through the heat storage pipe, so that the inclined temperature layer of the hot water storage tank continuously moves downward, completing the heat storage work of the hot water storage tank; during the heat release stage, the hot water in the upper part of the hot water storage tank flows into the heat network return pipe through the heat release pipe, and at the same time, the hot water in the heat network return pipe flows into the lower part of the hot water storage tank through the cold water pipe, so that the inclined temperature layer of the hot water storage tank continuously moves upward, completing the heat release work of the hot water storage tank.
[0009] During the above-mentioned heat release stage, the heat release pipeline is connected to the heat network return pipeline instead of the heat network supply pipeline. Since the fluid pressure in the heat network return pipeline is lower than the fluid pressure in the heat network supply pipeline, the energy consumption of transporting the hot water on the upper part of the hot water storage tank to the heat network return pipeline during the heat release stage is lower than the energy consumption of transporting the hot water to the heat network supply pipeline. For example, when a water pump is used to transport hot water, the water pump head required to transport the hot water on the upper part of the hot water storage tank to the heat network return pipeline is lower than the water pump head required to transport the hot water on the upper part of the hot water storage tank to the heat network supply pipeline, thereby reducing the power consumption and equipment cost of the water pump, and thus reducing the operating cost of the heat storage system.
[0010] Optionally, one end of the heat release pipeline is used to be connected to the heat network return pipeline and is located upstream of the heat network water pump.
[0011] Optionally, one end of the heat storage pipeline is used to be connected to the heat network return pipeline located upstream of the heat network water pump.
[0012] Optionally, the heat storage system provided by the present invention also includes a common pipeline, one end of which is used to connect to the heat network return pipeline located upstream of the heat network water pump, and the other end is respectively connected to the outlet of the heat release pipeline and the outlet of the heat storage pipeline.
[0013] Optionally, a heat release component is installed on the heat release pipeline, and the heat release component includes a heat release water pump, a first electric shut-off valve, a first flow orifice, a first thermometer and a first pressure gauge; a heat storage component is installed on the heat storage pipeline, and the heat storage component includes a heat storage water pump, a second electric shut-off valve, a second flow orifice, a second thermometer and a second pressure gauge.
[0014] Optionally, a plurality of the heat release components are installed in parallel on the heat release pipeline and / or a plurality of the heat storage components are installed in parallel on the heat storage pipeline.
[0015] Optionally, a third electric shut-off valve, a first pressure reducing valve, a third flow orifice plate, a first safety valve, a third pressure gauge, a third thermometer and a fourth electric shut-off valve are respectively installed on the hot water pipeline.
[0016] Optionally, a fifth electric shut-off valve, a second pressure reducing valve, a fourth flow orifice, a second safety valve, a fourth pressure gauge, a fourth thermometer and a sixth electric shut-off valve are respectively installed on the cold water pipeline.
[0017] Optionally, one end of the cold water pipeline is used to be connected to the heat network return pipeline located downstream of the heat network water pump.
[0018] Optionally, the heat storage device further includes a third safety valve disposed on the top of the hot water storage tank. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of a heat storage system for heat peak regulation provided by the present invention.
[0020] Description of Reference Numerals
[0021] 1-Heating network first station; 2-Heating network water supply equipment; 21-Heating network water supply pipeline; 3-Heating network return water equipment; 31-Heating network return water pipeline; 32-Heating network water pump; 4-Heat storage equipment; 41-Hot water storage tank; 42-Third safety valve; 5-Hot water pipeline; 51-Third electric shut-off valve; 52-First pressure reducing valve; 53-Third flow orifice; 54-First safety valve; 55-Third pressure gauge; 56-Third thermometer; 57-Fourth electric shut-off valve; 6-Cold water pipeline; 61-Fifth electric shut-off valve; 62-Second pressure reducing valve; 63-Fourth flow orifice; 64-Fourth pressure gauge; 65-Fourth thermometer; 66-Second safety valve; 67-Sixth electric shut-off valve; 7-Heat release component; 8-Heat storage component; 9-Common pipeline. DETAILED DESCRIPTION
[0022] The following is a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.
[0023] In the present invention, unless otherwise specified, the directions or positional relationships indicated by terms such as "up, down, left, right, inside, outside, top, bottom" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.
[0024] Furthermore, the terms "first," "second," and so forth are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.
[0025] In the present invention, descriptions with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.
[0026] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.
[0027] The utility model aims to solve the problem of high energy consumption of existing heat storage system and provide a heat storage system for peak load regulation. Figure 1 As shown, the heat storage system includes: a heat network first station 1, the inlet and outlet of the heat network first station 1 are respectively connected to the heat network return water pipeline 31 and the heat network water supply pipeline 21, the heat network return water pipeline 31 is installed with a heat network water pump 32, the heat network first station transmits hot water to the heat network water supply equipment 2 through the heat network water supply pipeline 21, and the heat network return water equipment 3 transmits cold water back to the heat network first station 1 through the heat network water pump 32; a heat storage device 4, the heat storage device 4 includes a hot water storage tank 41, the hot water storage tank 41 has an upper interface and a lower interface, the upper interface is located at the upper part of the hot water storage tank 41, and the lower interface is located at the lower part of the hot water storage tank 41; a hot water pipeline 5, the hot water pipeline 5 Used to connect the heating network water supply pipeline 21 and the upper interface to transport the hot water in the heating network water supply pipeline 21 to the upper part of the hot water storage tank 41; the cold water pipeline 6, the cold water pipeline 6 is used to connect the heating network return pipeline 31 and the lower interface to transport the cold water in the heating network return pipeline 31 to the lower part of the hot water storage tank 41; the heat release pipeline, the heat release pipeline is used to connect the heating network return pipeline 31 and the upper interface to transport the hot water in the upper part of the hot water storage tank 41 to the heating network return pipeline 31; the heat storage pipeline, the heat storage pipeline is used to connect the heating network return pipeline 31 and the lower interface to transport the cold water in the lower part of the hot water storage tank 41 to the heating network return pipeline 31.
[0028] Through the above technical solution, when the heat storage system is in normal heating operation mode, the heat network head station 1 supplies hot water to the heat network water supply equipment 2 of the heat consumption system through the heat network water supply pipeline 21. The heat network return water equipment 3 of the heat consumption system transports cold water back to the heat network head station 1 through the heat network return water pipeline 31. After being heated by the heat network head station 1, it is again transported to the heat network water supply equipment 2. When the heat storage system is in heat storage-heat release operation mode, the hot water pipeline 5 can be connected to the upper interface of the heat network water supply pipeline 21 and the hot water storage tank 41, the cold water pipeline 6 can be connected to the lower interface of the heat network return water pipeline 31 and the hot water storage tank 41, the heat release pipeline can be connected to the upper interface of the heat network return water pipeline 31 and the hot water storage tank 41, and the heat storage pipeline can be connected to the lower interface of the heat network return water pipeline 31 and the hot water storage tank 41. During the heat storage stage, the hot water in the heating network water supply pipeline 21 flows into the upper part of the hot water storage tank 41 through the hot water pipeline 5, and at the same time, the cold water in the lower part of the hot water storage tank 41 flows into the heating network return pipeline 31 through the heat storage pipeline, so that the inclined temperature layer of the hot water storage tank 41 continuously moves downward, completing the heat storage work of the hot water storage tank 41; during the heat release stage, the hot water in the upper part of the hot water storage tank 41 flows into the heating network return pipeline 31 through the heat release pipeline, and at the same time, the cold water in the heating network return pipeline 31 flows into the lower part of the hot water storage tank 41 through the cold water pipeline 6, so that the inclined temperature layer of the hot water storage tank 41 continuously moves upward, completing the heat release work of the hot water storage tank 41.
[0029] During the above-mentioned heat release stage, the heat release pipeline is connected to the heating network return pipeline 31 instead of the heating network water supply pipeline 21. Since the fluid pressure in the heating network return pipeline 31 is lower than the fluid pressure in the heating network water supply pipeline 21, the energy consumption of transporting the hot water on the upper part of the hot water storage tank 41 to the heating network return pipeline 31 during the heat release stage is lower than the energy consumption of transporting the hot water to the heating network water supply pipeline 21. For example, when a water pump is used to transport hot water, the water pump head required to transport the hot water on the upper part of the hot water storage tank 41 to the heating network return pipeline 31 is lower than the head required to transport the hot water on the upper part of the hot water storage tank 41 to the heating network water supply pipeline 21, thereby reducing the power consumption and equipment cost of the water pump, and thus reducing the operating cost of the heat storage system.
[0030] In some embodiments, reference Figure 1 As shown, one end of the heat release pipeline is used to connect to the heat network return pipeline 31 located upstream of the heat network water pump 32. Since the fluid pressure upstream of the heat network water pump 32 is lower than the fluid pressure downstream, connecting one end of the heat release pipeline to the heat network return pipeline 31 located upstream of the heat network water pump 32 is more conducive to reducing the energy consumption of transporting hot water to the heat network return pipeline 31, and further reducing the operating cost of the heat storage system.
[0031] In some embodiments, reference Figure 1 As shown, one end of the heat storage pipeline is used to connect to the heat network return pipeline 31 located upstream of the heat network water pump 32, which can reduce the energy consumption of transporting cold water to the heat network return pipeline 31 and further reduce the operating cost of the heat storage system.
[0032] In some embodiments, reference Figure 1 As shown, the thermal storage system provided by the present invention also includes a shared pipeline 9. One end of the shared pipeline 9 is connected to the heat network return pipeline 31, located upstream of the heat network water pump 32, and the other end is connected to the outlet of the heat release pipeline and the outlet of the heat storage pipeline. In this way, the heat release pipeline and the heat storage pipeline share a common pipeline 9, which not only simplifies the piping system, but also reduces piping layout costs, further reducing the operating costs of the thermal storage system.
[0033] In some embodiments, reference Figure 1 As shown, a heat release assembly 7 is installed in the heat release pipeline. This assembly includes a heat release water pump, a first electric shut-off valve, a first flow orifice, a first thermometer, and a first pressure gauge. Specifically, a manual valve is provided at the inlet of the heat release water pump, and a check valve and a first electric shut-off valve are provided at the outlet. The heat release pipeline is also equipped with a first flow orifice, a first thermometer, and a first pressure gauge to monitor the flow, temperature, and pressure of the hot water in the heat release pipeline. The hot water in the upper portion of the hot water storage tank 41 is delivered to the heat network return pipeline 31 via the heat release water pump.
[0034] In some embodiments, a thermal storage assembly 8 is installed on the thermal storage pipeline. The thermal storage assembly 8 includes a hot water pump, a second electric shut-off valve, a second flow orifice plate, a second thermometer, and a second pressure gauge. Specifically, a manual valve is provided at the inlet of the hot water pump, and a check valve and a second electric shut-off valve are provided at the outlet. The second flow orifice plate, a second thermometer, and a second pressure gauge are also provided on the thermal storage pipeline to monitor the flow, temperature, and pressure of the cold water in the thermal storage pipeline. The cold water in the lower portion of the hot water tank 41 is delivered to the heat network return line 31 by the hot water pump.
[0035] In some embodiments, a plurality of heat release components 7 are installed in parallel on the heat release pipeline and / or a plurality of heat storage components 8 are installed in parallel on the heat storage pipeline. Figure 1 As shown, two heat release components 7 are installed in parallel on the heat release pipeline, one for operation and one for backup, which is convenient for shutdown of the heat release components 7 for maintenance and ensures the normal operation of the heat storage system; two heat storage components 8 are installed in parallel on the heat storage pipeline, one for operation and one for backup, which is convenient for shutdown of the heat storage components 8 for maintenance and ensures the normal operation of the heat storage system.
[0036] In some embodiments, reference Figure 1As shown, the hot water pipeline 5 is equipped with a third electric shutoff valve 51, a first pressure reducing valve 52, a third flow orifice 53, a first safety valve 54, a third pressure gauge 55, a third thermometer 56, and a fourth electric shutoff valve 57. Hot water in the heating network water supply pipeline 21 is decompressed by the first pressure reducing valve 52 before being delivered to the upper portion of the hot water storage tank 41. This prevents excessive pressure in the hot water entering the hot water storage tank 41, which could damage the hot water storage tank 41. If the thermal storage system overpressures, the hot water pipeline 5 can be relieved via the first safety valve 54.
[0037] In some embodiments, reference Figure 1 As shown, the cold water pipeline 6 is equipped with a fifth electric shutoff valve 61, a second pressure reducing valve 62, a fourth flow orifice 63, a fourth pressure gauge 64, a fourth thermometer 65, a second safety valve 66, and a sixth electric shutoff valve 67. The cold water in the heat network return pipeline 31 is decompressed by the second pressure reducing valve 62 before being delivered to the lower portion of the hot water storage tank 41. This prevents excessive pressure in the cold water entering the hot water storage tank 41, which could damage the hot water storage tank 41. If the thermal storage system overpressures, the cold water pipeline 6 can relieve pressure through the second safety valve 66.
[0038] In some embodiments, reference Figure 1 As shown, one end of the cold water pipe 6 is used to connect to the heat network return pipe 31 located downstream of the heat network water pump 32. The cold water in the heat network return pipe 31 is more conducive to being transported to the lower part of the hot water storage tank 41 after being pressurized by the heat network water pump 32.
[0039] In some embodiments, reference Figure 1 As shown, the heat storage device 4 further includes a third safety valve 42 disposed on the top of the hot water storage tank 41. When the hot water storage tank 41 is over-pressured, the pressure can be released through the third safety valve 42 to ensure safe operation of the heat storage system.
[0040] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention may be subjected to various simple modifications, including combining the specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be considered as disclosed in the present invention and fall within the scope of protection of the present invention.
Claims
1. A heat storage system for heat peak regulation, characterized in that: include: A heating network first station (1), wherein the inlet and outlet of the heating network first station (1) are respectively connected to a heating network return pipe (31) and a heating network water supply pipe (21), and a heating network water pump (32) is installed on the heating network return pipe (31); A heat storage device (4), the heat storage device (4) comprising a hot water storage tank (41), the hot water storage tank (41) having an upper interface and a lower interface; A hot water pipeline (5), the hot water pipeline (5) being used to connect the heating network water supply pipeline (21) and the upper interface; A cold water pipeline (6), the cold water pipeline (6) being used to connect the heat network return water pipeline (31) and the lower interface; a heat release pipeline, the heat release pipeline being used to connect the heat network return pipeline (31) and the upper interface; and A heat storage pipeline is used to connect the heat network return water pipeline (31) and the lower interface.
2. The heat storage system for heat peak regulation according to claim 1, characterized in that: One end of the heat release pipeline is used to communicate with the heat network return pipeline (31) and is located upstream of the heat network water pump (32).
3. The heat storage system for heat peak regulation according to claim 2, characterized in that: One end of the heat storage pipeline is used to be connected to the heat network return pipeline (31) located upstream of the heat network water pump (32).
4. The heat storage system for heat peak regulation according to claim 3, characterized in that: It also includes a common pipeline (9), one end of which is used to be connected to the heat network return pipeline (31) located upstream of the heat network water pump (32), and the other end of which is respectively connected to the outlet of the heat release pipeline and the outlet of the heat storage pipeline.
5. The heat storage system for heat peak regulation according to claim 3, characterized in that: A heat release component (7) is installed on the heat release pipeline, and the heat release component (7) includes a heat release water pump, a first electric shut-off valve, a first flow orifice plate, a first thermometer, and a first pressure gauge; A heat storage component (8) is installed on the heat storage pipeline, and the heat storage component (8) includes a heat storage water pump, a second electric shut-off valve, a second flow orifice plate, a second thermometer, and a second pressure gauge.
6. The heat storage system for heat peak regulation according to claim 5, characterized in that: A plurality of the heat release components (7) are installed in parallel on the heat release pipeline and / or a plurality of the heat storage components (8) are installed in parallel on the heat storage pipeline.
7. The heat storage system for heat peak regulation according to claim 1, characterized in that: The hot water pipeline (5) is respectively equipped with a third electric shut-off valve (51), a first pressure reducing valve (52), a third flow orifice plate (53), a first safety valve (54), a third pressure gauge (55), a third thermometer (56) and a fourth electric shut-off valve (57).
8. The heat storage system for heat peak regulation according to claim 1, characterized in that: The cold water pipeline (6) is respectively equipped with a fifth electric shut-off valve (61), a second pressure reducing valve (62), a fourth flow orifice plate (63), a fourth pressure gauge (64), a fourth thermometer (65), a second safety valve (66) and a sixth electric shut-off valve (67).
9. The heat storage system for heat peak regulation according to claim 1, characterized in that: One end of the cold water pipeline (6) is used to be connected to the heat network return water pipeline (31) located downstream of the heat network water pump (32).
10. The heat storage system for heat peak regulation according to any one of claims 1 to 9, characterized in that: The heat storage device (4) further comprises a third safety valve (42) arranged on the top of the hot water storage tank (41).