Heat storage system for heat supply peak regulation

Abstract

The invention relates to the technical field of heat supply systems of thermal power plants, and discloses a heat storage system for heat supply peak shaving, the heat storage system comprises a heat supply network initial station, a heat storage device, a hot water pipeline, a cold water pipeline, a heat release pipeline and a heat storage pipeline, the inlet and the outlet of the heat supply network initial station are respectively communicated with a heat supply network water return pipeline and a heat supply network water supply pipeline; the heat storage equipment comprises a heat storage water tank with an upper connector and a lower connector, the hot water pipeline is used for communicating a heat supply network water supply pipeline with the upper connector, the cold water pipeline is used for communicating a heat supply network water return pipeline with the lower connector, the heat release pipeline is used for communicating the heat supply network water return pipeline with the upper connector, and the heat storage pipeline is used for communicating the heat supply network water return pipeline with the lower connector. And the heat release pipeline is communicated with the heat supply network water return pipeline instead of the heat supply network water supply pipeline, so that the power consumption of the water pump and the equipment cost are reduced, and the operation cost of the heat storage system is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of thermal power plant heating systems, and in particular to a heat storage system for heating peak regulation. Background Art

[0002] In order to achieve the purpose of peak-shaving of 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 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 supply, which reduces 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] At present, a heat storage system is usually configured in the cylinder cutting transformation technology to achieve the matching of peak load regulation and heating supply. The existing heat storage system for heating peak load regulation generally adopts a hot water storage tank. The hot water storage tank is based on the inclined temperature layer heat storage technology. The basic principle of the inclined temperature layer is to separate the cold and hot media with a temperature gradient layer, that is, to use the same hot water storage tank to store both high and low temperature media. During heat storage, the hot water in the heat network water supply pipe enters the upper water distributor. The water outlet speed of the water distributor is uniform, which can prevent the mixing of the cold and hot water layers in the heat storage tank; at the same time, the same volume of low-temperature water at the bottom flows out through the lower water distributor and enters the heat network return pipe. During the process, the inclined temperature layer gradually descends from top to bottom in the hot water storage tank until it disappears completely. At this time, the tank is full of hot water, and the heat storage process is completed. Similarly, when the hot water tank releases heat, the hot water on the upper part of the hot water 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 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 heat storage systems usually use a heat discharge water pump to discharge the hot water in the heat storage tank into the heat network water supply pipeline. This process requires the heat discharge water pump to have a head sufficient to connect the hot water at normal pressure in the heat storage tank to the heat network water supply pipeline with a larger water pressure head. The heat discharge water pump has relatively high head requirements, and the water pump motor consumes a lot of power, which increases the system power consumption and cost.

[0005] Therefore, there is an urgent need for a heat storage system with low energy consumption and operating costs. Summary of the invention

[0006] The purpose of the present invention 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 peak heat regulation, which has the advantages of low energy consumption and operating costs.

[0007] In order to achieve the above-mentioned purpose, the present invention provides a heat storage system for peak heat supply, comprising: a heating network head station, the inlet and outlet of the heating network head 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 comprises 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; 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 the normal heating working mode, the heat network head station provides the heat network water supply to the heat using system through the heat network water supply pipeline, and the heat network return water of the heat using system is transported back to the heat network head station through the heat network return pipeline, and is transported to the heat using system again after being heated by the heat network head station. When the heat storage system is in the heat storage-heat release working mode, the hot water pipeline can be connected with the heat network water supply pipeline and the upper interface of the hot water storage tank, the cold water pipeline can be connected with the heat network return pipeline and the lower interface of the hot water storage tank, the heat release pipeline can be connected with the heat network return pipeline and the upper interface of the hot water storage tank, and the heat storage pipeline can be connected with the heat 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 pipeline flows into the upper part of the hot water storage tank through the hot water pipeline, and at the same time, the cold water in the lower part of the hot water storage tank flows into the heat network return pipeline through the heat storage pipeline, 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 pipeline through the heat release pipeline, and at the same time, the hot network return water in the heat network return pipeline flows into the lower part of the hot water storage tank through the cold water pipeline, 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] In 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 top 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 top of the hot water storage tank to the heat network return pipeline is lower than the head required to transport the hot water on the top 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 water 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 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-heating 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

[0021] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0022] 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" etc. 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, and 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, and therefore should not be understood as a limitation on the present invention.

[0023] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0024] In the present invention, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In view of the problem of high energy consumption in the existing heat storage system, the present invention provides a heat storage system for peak heating. Figure 1 As shown, the heat storage system includes: a heat network head station 1, the inlet and outlet of the heat network head 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 head 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 head 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.

[0027] Through the above technical solution, when the heat storage system is in the normal heating working mode, the heat network head station 1 provides hot water to the heat network water supply equipment 2 of the heat using system through the heat network water supply pipeline 21, and the heat network return water equipment 3 of the heat using system transports cold water back to the heat network head station 1 through the heat network return water pipeline 31, and after being heated by the heat network head station 1, it is transported to the heat network water supply equipment 2 again. When the heat storage system is in the heat storage-heat release working mode, the hot water pipeline 5 can be connected with 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 with 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 with 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 with the lower interface of the heat network return water pipeline 31 and the hot water storage tank 41. In 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; in 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.

[0028] In the above-mentioned heat release stage, the heat release pipeline is connected to the heat network return pipeline 31 instead of the heat network water supply pipeline 21. Since the fluid pressure in the heat network return pipeline 31 is lower than the fluid pressure in the heat 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 heat network return pipeline 31 in the heat release stage is lower than the energy consumption of transporting the hot water to the heat 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 heat 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 heat 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.

[0029] 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.

[0030] 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.

[0031] In some embodiments, reference Figure 1 As shown, the heat storage system provided by the present invention further includes a common pipeline 9, one end of which is used to be connected to the heat network return water pipeline 31 located upstream of the heat network water pump 32, and the other end is respectively 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 pipeline system, but also reduces the pipeline layout cost, and further reduces the operating cost of the heat storage system.

[0032] In some embodiments, reference Figure 1 As shown, 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. 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. At the same time, a first flow orifice plate, a first thermometer and a first pressure gauge are also provided on the heat release pipeline to monitor the flow, temperature and pressure of hot water in the heat release pipeline. The hot water on the upper part of the hot water storage tank 41 is transported to the heat network return water pipeline 31 through the heat release water pump.

[0033] In some embodiments, a heat storage assembly 8 is installed on the heat storage pipeline, and the heat storage assembly 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. Specifically, a manual valve is provided at the inlet of the heat storage water pump, and a check valve and a second electric shut-off valve are provided at the outlet. At the same time, a second flow orifice plate, a second thermometer, and a second pressure gauge are also provided on the heat storage pipeline to monitor the flow, temperature, and pressure of the cold water in the heat storage pipeline. The cold water at the bottom of the heat storage water tank 41 is transported to the heat network return water pipeline 31 through the heat storage water pump.

[0034] 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 of which is in operation and the other is in reserve, which is convenient for the heat release component 7 to be shut down 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 of which is in operation and the other is in reserve, which is convenient for the heat storage component 8 to be shut down for maintenance and ensures the normal operation of the heat storage system.

[0035] In some embodiments, reference Figure 1As shown, the hot water pipeline 5 is respectively installed with a third electric shut-off 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 shut-off valve 57. The hot water in the heat network water supply pipeline 21 is depressurized by the first pressure reducing valve 52 and then transported to the upper part of the hot water storage tank 41 to prevent the hot water pressure entering the hot water storage tank 41 from being too high, causing damage to the hot water storage tank 41. When the heat storage system is over-pressured, the hot water pipeline 5 can be depressurized through the first safety valve 54.

[0036] In some embodiments, reference Figure 1 As shown, the cold water pipeline 6 is respectively installed with a fifth electric shut-off 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 shut-off valve 67. The cold water in the heat network return water pipeline 31 is decompressed by the second pressure reducing valve 62 and then transported to the lower part of the hot water storage tank 41 to prevent the cold water pressure entering the hot water storage tank 41 from being too high, causing damage to the hot water storage tank 41. When the heat storage system is over-pressured, the cold water pipeline 6 can be decompressed through the second safety valve 66.

[0037] In some embodiments, reference Figure 1 As shown, one end of the cold water pipeline 6 is used to connect to the heat network return water pipeline 31 located downstream of the heat network water pump 32. The cold water in the heat network return water pipeline 31 is more convenient to be transported to the lower part of the hot water storage tank 41 after being pressurized by the heat network water pump 32.

[0038] In some embodiments, reference Figure 1 As shown, the heat storage device 4 also includes a third safety valve 42 arranged 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 the safe operation of the heat storage system.

[0039] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various specific technical features in any appropriate manner. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A heat storage system for peak heat 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 water pipeline (31) and a heating network water supply pipeline (21), and a heating network water pump (32) is installed on the heating network return water pipeline (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 water pipeline (31) and the upper interface; and A heat storage pipeline, the heat storage pipeline is used to connect the heat network return water pipeline (31) and the lower interface.

2. The heat storage system for heating peak regulation according to claim 1, characterized in that: One end of the heat release pipeline is used to be connected to the heat network return pipeline (31) and is located upstream of the heat network water pump (32).

3. The heat storage system for heating peak load 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 water pipeline (31) located upstream of the heat network water pump (32).

4. The heat storage system for heating peak load regulation according to claim 3, characterized in that: It also comprises 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 heating peak load 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) comprises 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) comprises 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 heating peak load 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 heating peak load regulation according to claim 1, characterized in that: The hot water pipeline (5) is respectively installed 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 heating peak load regulation according to claim 1, characterized in that: The cold water pipeline (6) is respectively installed 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 heating peak load 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 heating peak load 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).

Images