A heat and power comprehensive utilization system for waste heat recovery of a power transformation and storage device

Abstract

A combined heat and power utilization system for waste heat recovery from substation and energy storage equipment is disclosed. The system includes a waste heat recovery unit, comprising a heat exchanger, a phase change hot water storage tank, and a second water pump connected in a loop via pipelines. The heat exchanger includes a first heat exchanger fixed to a battery module and a second heat exchanger fixed to a transformer. A water supply pipeline and a first check valve are provided on the pipeline between the inlet of the first heat exchanger and the outlet of the second water pump. The water supply pipeline includes a first water supply port and a first water pump. The outlet of the second heat exchanger is also connected to a user's heating terminal via a pipeline. This invention can cool the substation equipment and energy storage device while recovering waste heat. It reduces the investment required for the operating environment of substation equipment and ensures the ambient temperature for the substation equipment and energy storage device. Furthermore, the waste heat recovery can meet the heating needs of substation staff.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery technology for power equipment, specifically to a thermoelectric integrated utilization system for waste heat recovery from power storage equipment. Background Technology

[0002] Currently, global energy demand is rising sharply. With my country's urbanization rate gradually increasing and various construction projects underway, people's demands for comfort are also constantly rising. Consequently, the demand for electricity is continuously increasing, and the construction of power systems is expanding. Substations, as the main component and key node of power system construction, consume a significant amount of energy. Indoor substations have advantages such as small footprint, aesthetics, low noise, and ease of management. However, compared to outdoor substations, indoor space is limited, heat dissipation is poor, and the energy consumption for ventilation and cooling of equipment such as transformers will increase accordingly. Indoor substations mainly consist of equipment rooms such as main transformer rooms, station transformer rooms, reactor rooms, distribution equipment rooms, and capacitor rooms.

[0003] Currently, the cooling system for these devices combines natural air intake and mechanical exhaust. However, when natural air intake and mechanical exhaust are insufficient to reduce the temperature to the target level, split-type air conditioners are required to further lower the temperature. This demonstrates that, in addition to being a major component of the power system, the energy consumption of substations is also a significant issue.

[0004] Various power equipment are significant factors affecting substation operation. However, the heat generated by transformer equipment not only impacts its operation but also incurs additional energy input and consumption for cooling. Traditional cooling methods, combining natural air intake, mechanical exhaust, and split-type air conditioning, have the following drawbacks: mechanical exhaust and air conditioning consume significant energy; indoor and outdoor air circulation allows outdoor dust to inevitably enter the room, extending the lifespan of power distribution equipment; and the temperature distribution among substation equipment is often unreasonable, with areas requiring cooling experiencing higher temperatures while areas not requiring cooling remain cool, hindering energy conservation. Photovoltaic technology is a major technology for utilizing renewable energy and can increase its utilization rate. However, photovoltaic power generation is intermittent, and its characteristic curve does not match social electricity demand. Energy storage technology is one way to address this issue, but energy storage batteries generate significant heat during operation, requiring additional cooling measures to ensure their safe operation. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to protect the operation of substation equipment by recovering waste heat from substation equipment, and to improve the substation by modifying the substation so that the system can basically meet the heat and electricity needs of substation employees for production and life. In order to solve the above problems, a comprehensive thermoelectric utilization system for waste heat recovery from substation energy storage equipment is provided.

[0006] The object of this invention is achieved in the following manner:

[0007] A combined heat and power utilization system for waste heat recovery from substation and energy storage equipment, the system includes a waste heat recovery unit, the waste heat recovery unit includes a heat exchanger, a phase change hot water storage tank 10 and a second water pump 5 connected in a loop by pipelines in sequence, the heat exchanger includes a first heat exchanger 15 fixed on a battery module 14 and a second heat exchanger 12 fixed on a transformer 13; a water supply pipeline and a first check valve 3 are provided on the pipeline between the inlet of the first heat exchanger 15 and the outlet of the second water pump 5, the water supply pipeline is provided with a first water supply port 1 and a first water pump 2, and the outlet of the second heat exchanger 12 is also connected to the user's heating terminal by pipeline.

[0008] A fourth solenoid valve 11 is provided on the pipeline between the second heat exchanger 12 and the first inlet of the phase change hot water storage tank 10, and a second solenoid valve 6 is provided on the pipeline between the first outlet of the phase change hot water storage tank 10 and the inlet of the second water pump 5.

[0009] One outlet of the water supply pipeline is connected to the loop, and the other outlet is connected to the first branch. The other end of the first branch is connected to the pipeline between the fourth solenoid valve 11 and the first inlet of the phase change hot water storage tank 10. The first outlet of the phase change hot water storage tank is connected to the second branch, and the other end of the second branch is connected to the user's heating terminal 8. The first branch is equipped with a first solenoid valve 4, and the second branch is equipped with a third solenoid valve 7. A second check valve 9 is provided on the pipeline between the second heat exchanger 12 and the user's heating terminal 8.

[0010] The battery module 14 is electrically connected to the photovoltaic array 21, which is installed on the roof of the substation. The photovoltaic array converts solar energy into electrical energy for users. The output of the photovoltaic array is divided into two paths: one path is electrically connected to the input of the battery module 14 through the first switch 22, and the other path is electrically connected to the user's power terminal 26 after passing through the second switch 23 and the fourth switch 25 in sequence. The output of the battery module 14 is connected between the second switch 23 and the fourth switch 25 through the third switch 24.

[0011] The system also includes a floor heating circulation loop, which includes a second outlet of a phase change hot water storage tank 10, a third water pump 17, a fifth solenoid valve 18, a third check valve 19, an inlet of a floor heating terminal 20, an outlet of a floor heating terminal 20, and a second inlet of a phase change hot water storage tank 10 connected in sequence; a second water supply port 16 is provided on the loop between the second outlet of the phase change hot water storage tank 10 and the third water pump 17.

[0012] The beneficial effects of this invention are as follows: Compared with the prior art, this invention can realize the function of recovering waste heat from substations and energy storage devices. While recovering waste heat, it can also cool down the power equipment and energy storage devices. This reduces the investment in the operating environment protection equipment of substation equipment, while still ensuring the operating temperature of the power equipment and energy storage devices. Furthermore, the waste heat recovery can meet the heating needs of substation staff. Attached Figure Description

[0013] Figure 1 This is a system diagram of the thermoelectric integrated utilization system for waste heat recovery of the substation energy storage equipment of the present invention.

[0014] Figure 2 This is the main view of the first heat exchanger.

[0015] Figure 3 This is a side view of the first heat exchanger.

[0016] Figure 4 This is the main view of the second heat exchanger.

[0017] Figure 5 This is the operation diagram of a phase change hot water storage tank.

[0018] Figure 6 This is a diagram of a waste heat recovery and heat storage cycle.

[0019] Figure 7 This is a diagram of the waste heat recovery and heat release cycle.

[0020] Figure 8 This is a flowchart of the heat control logic.

[0021] Figure 9 This is the flowchart of the power control logic.

[0022] Wherein: 1: First water inlet; 2: First water pump; 3: First check valve; 4: First solenoid valve; 5: Second water pump; 6: Second solenoid valve; 7: Third solenoid valve; 8: User heating terminal; 9: Second check valve; 10: Underground phase change hot water storage tank; 11: Fourth solenoid valve; 12: Second heat exchanger; 13: Transformer; 14: Battery module; 15: First heat exchanger; 16: Second water inlet; 17: Third water pump; 18: Fifth solenoid valve; 19: Third check valve; 20: Underfloor heating terminal; 21: Photovoltaic array; 22: First switch; 23: Second switch; 24: Third switch; 25: Fourth switch; 26: User electricity terminal;

[0023] 1201: Inlet; 1202: Outlet; 1203: Microchannel heat exchange tube; 1204: Fixing bolt; 1205: Double-sided sandwich layer; 1501: Inlet; 1502: Outlet; 1503: Fixing plate; 1504: Bolt; 1505: Plate; 1001: First inlet; 1002: First outlet; 1003: Second inlet; 1004: Second outlet; 1005: Insulation material; 1006: Stainless steel tank; 1007: Square phase change material plate; 1008: Water tank top cover Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same technical meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0026] A combined heat and power utilization system for waste heat recovery from substation and energy storage equipment, the system includes a waste heat recovery unit, the waste heat recovery unit includes a heat exchanger, a phase change hot water storage tank 10 and a second water pump 5 connected in a loop by pipelines in sequence, the heat exchanger includes a first heat exchanger 15 fixed on a battery module 14 and a second heat exchanger 12 fixed on a transformer 13; a water supply pipeline and a first check valve 3 are provided on the pipeline between the inlet of the first heat exchanger 15 and the outlet of the second water pump 5, the water supply pipeline is provided with a first water supply port 1 and a first water pump 2, and the outlet of the second heat exchanger 12 is also connected to the user's heating terminal by pipeline.

[0027] A fourth solenoid valve 11 is provided on the pipeline between the second heat exchanger 12 and the first inlet of the phase change hot water storage tank 10, and a second solenoid valve 6 is provided on the pipeline between the first outlet of the phase change hot water storage tank 10 and the inlet of the second water pump 5.

[0028] One outlet of the water supply pipeline is connected to the loop, and the other outlet is connected to the first branch. The other end of the first branch is connected to the pipeline between the fourth solenoid valve 11 and the first inlet of the phase change hot water storage tank 10. The first outlet of the phase change hot water storage tank is connected to the second branch, and the other end of the second branch is connected to the user's heating terminal 8. The first branch is equipped with a first solenoid valve 4, and the second branch is equipped with a third solenoid valve 7. A second check valve 9 is provided on the pipeline between the second heat exchanger 12 and the user's heating terminal 8.

[0029] The battery module 14 is electrically connected to the photovoltaic array 21, which is installed on the roof of the substation. The photovoltaic array converts solar energy into electrical energy for users. The output of the photovoltaic array is divided into two paths: one path is electrically connected to the input of the battery module 14 through the first switch 22, and the other path is electrically connected to the user's power terminal 26 after passing through the second switch 23 and the fourth switch 25 in sequence. The output of the battery module 14 is connected between the second switch 23 and the fourth switch 25 through the third switch 24.

[0030] The system also includes a floor heating circulation loop, which includes a second outlet of a phase change hot water storage tank 10, a third water pump 17, a fifth solenoid valve 18, a third check valve 19, an inlet of a floor heating terminal 20, an outlet of a floor heating terminal 20, and a second inlet of a phase change hot water storage tank 10 connected in sequence; a second water supply port 16 is provided on the loop between the second outlet of the phase change hot water storage tank 10 and the third water pump 17.

[0031] Both the first heat exchanger and the second heat exchanger of the present invention are plate heat exchangers.

[0032] The system schematic diagram of this invention is attached. Figure 1 The system operates as follows:

[0033] Waste heat recovery loop operation:

[0034] When the recovered waste heat energy meets the heating demand: at this time, the second solenoid valve 6 and the fourth solenoid valve 11 are open, the remaining solenoid valves are closed, and the first water pump 2 and the second water pump 5 are open. Under the action of the first water pump 2, the replenished water enters the loop from the first water inlet 1, mixes with the return water circulating from the first check valve 3, and then flows sequentially through the first heat exchanger 15 (see appendix). Figure 2 ), and the second heat exchanger 12 (see appendix) Figure 4 Low-temperature hot water flows from inlet 1501 into the first heat exchanger 15, where it exchanges heat with the battery module 14, and then flows out from outlet 1502. It then flows into the second heat exchanger 12 through inlet 1201, where it exchanges heat with the transformer 13, and then flows out from outlet 1202. The low-temperature hot water is heated to high-temperature hot water. Part of the high-temperature hot water flows through the second check valve 9 directly to the user's heating terminal 8 for user use, while the other part flows through the fourth solenoid valve 11 into the phase change hot water storage tank 10 (see appendix). Figure 5 In this process, high-temperature hot water flows in through the first inlet 1001, releases heat in the phase change hot water storage tank 10, and then flows out through the first outlet 1002, becoming low-temperature hot water. Under the action of the second pump 5, it flows towards the first check valve 3, completing a full waste heat recovery and heat storage cycle. (See appendix) Figure 6 .

[0035] When the recovered waste heat cannot meet the user's heating needs: At this time, the first solenoid valve 4 and the third solenoid valve 7 are open, all other solenoid valves are closed, the first water pump 2 is open, and the second water pump 5 is closed. Under the action of the first water pump 2, makeup water enters the loop from the first water inlet 1. Part of the makeup water flows through the first heat exchanger 15 and the second heat exchanger 12, where it is heated into high-temperature hot water and flows directly to the user's heating terminal 8 via the second check valve 9 for user use. The other part of the makeup water flows through the first solenoid valve 4 into the phase change hot water storage tank 10. Low-temperature makeup water flows in from the first inlet 1001, is heated in the phase change hot water storage tank 10, and flows out from the first outlet 1002, becoming high-temperature hot water. This high-temperature hot water flows through the third solenoid valve 7 to the user's heating terminal 8 for user use. This completes one waste heat recovery and heat release cycle. (See appendix) Figure 7 .

[0036] Underfloor heating circulation loop operation:

[0037] During heating, the third water pump 17 and the fifth solenoid valve 18 are opened to provide power for the loop operation. Under the action of the third water pump 17, low-temperature hot water flows into the phase change hot water storage tank 10 through the second inlet 1003. In the phase change hot water storage tank 10, heat exchange occurs with high-temperature materials, heating the low-temperature hot water to high-temperature hot water. The high-temperature hot water flows out from the second outlet 1004, passes through the third water pump 17, the fifth solenoid valve 18, and the third check valve 19, and flows into the underfloor heating terminal 20. After releasing heat at the underfloor heating terminal 20, the high-temperature hot water becomes low-temperature hot water and flows out again, returning to the phase change hot water storage tank 10 via the second inlet 1003, completing a full heating cycle. When the circulating water in the loop is too low, the second water inlet 16 can be opened to replenish water.

[0038] Except during the heating season, the underfloor heating circulation loop equipment is shut down.

[0039] The heat control logic is attached. Figure 8 .

[0040] Power consumption regulation methods for photovoltaic power generation:

[0041] A photovoltaic array 21 is installed on the roof of the substation. When sunlight shines on its surface, the photovoltaic array 21 can convert solar energy into electrical energy for users through the photovoltaic effect.

[0042] When the photovoltaic array 21 converts sufficient electricity: a portion of the converted electricity is supplied to the user's power terminal 26 to power air conditioning equipment and other electrical appliances; the remaining electrical energy is converted into chemical energy and stored by the battery module 14. In this case, the electricity flows from the photovoltaic array 21 into the battery module 14 and the user's power terminal 26. At this time, the first switch 22, the second switch 23, and the fourth switch 25 are closed, and the third switch 24 is open.

[0043] When the power converted by the photovoltaic array 21 is insufficient: all the converted power is supplied to the user's power terminal 26, and the insufficient portion is provided by the battery module 14. In this case, power flows from the photovoltaic array 21 and the battery module 14 to the user's power terminal 26. At this time, the second switch 23, the third switch 24, and the fourth switch 25 are closed, and the second switch 22 is open.

[0044] When the user's power terminal 26 is not in use: all the electricity converted by the photovoltaic array 21 is stored in the battery module 14 for use when power generation is insufficient. At this time, the second switch 23, the third switch 24, and the fourth switch 25 are open, and the second switch 22 is closed.

[0045] The power control logic is attached. Figure 9 .

[0046] The phase change hot water storage tank structure in this invention is as follows: Figure 5 As shown, the phase change hot water storage tank includes a stainless steel tank body 1006, and a plurality of square phase change material plates 1007 are arranged inside the stainless steel tank body 1006. The stainless steel tank body 1006 includes two pipes, and the two ends of the two pipes are respectively a first water inlet 1001, a first water outlet 1002, a second water inlet 1003, and a second water outlet 1004.

[0047] This invention is a complete substation waste heat recovery and integrated heat and power utilization system. It utilizes a photovoltaic array to provide power, energy storage devices to regulate user electricity consumption, heat exchange equipment to recover waste heat from the transformer and energy storage devices, thermal storage devices to regulate user heating, and underfloor heating and hot water terminals to meet the heating needs of substation personnel. This system can recover waste heat from the substation and energy storage devices, simultaneously cooling the transformer and energy storage devices. This reduces investment in environmental protection equipment while maintaining the operating temperature of the transformer and energy storage devices, and meets the heating needs of substation staff through waste heat recovery. The photovoltaic array and energy storage devices can basically meet the electricity needs of substation staff. By combining the characteristics of substation buildings and equipment operation, this system can reduce additional electricity and heat input for substation operation, reduce investment in environmental protection equipment, and achieve self-sufficiency in heating and electricity for substation living facilities.

[0048] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A combined heat and power utilization system for waste heat recovery from substation energy storage equipment, characterized in that: The system includes a waste heat recovery unit, which includes a heat exchanger, a phase change hot water storage tank (10), and a second water pump (5) connected in a loop by pipelines in sequence. The heat exchanger includes a first heat exchanger (15) fixed on the battery module (14) and a second heat exchanger (12) fixed on the transformer (13). A water supply pipeline and a first check valve (3) are provided on the pipeline between the inlet of the first heat exchanger (15) and the outlet of the second water pump (5). A first water supply port (1) and a first water pump (2) are provided on the water supply pipeline. The outlet of the second heat exchanger (12) is also connected to the user's heating terminal by pipeline.

2. The combined heat and power utilization system for waste heat recovery from substation energy storage equipment according to claim 1, characterized in that: A fourth solenoid valve (11) is provided on the pipeline between the second heat exchanger (12) and the first inlet of the phase change hot water storage tank (10), and a second solenoid valve (6) is provided on the pipeline between the first outlet of the phase change hot water storage tank (10) and the inlet of the second water pump (5).

3. The combined heat and power utilization system for waste heat recovery from substation energy storage equipment according to claim 2, characterized in that: One outlet of the water supply pipeline is connected to the loop, and the other outlet is connected to the first branch. The other end of the first branch is connected to the pipeline between the fourth solenoid valve (11) and the first inlet of the phase change hot water storage tank (10). The first outlet of the phase change hot water storage tank is connected to the second branch, and the other end of the second branch is connected to the user's heating terminal (8). The first branch is equipped with a first solenoid valve (4), and the second branch is equipped with a third solenoid valve (7). The pipeline between the second heat exchanger (12) and the user's heating terminal (8) is equipped with a second check valve (9).

4. The combined heat and power utilization system for waste heat recovery from substation energy storage equipment according to claim 1, characterized in that: The battery module (14) is electrically connected to the photovoltaic array (21), which is installed on the roof of the substation. The photovoltaic array converts solar energy into electrical energy for users. The output of the photovoltaic array is divided into two paths. One path is electrically connected to the input of the battery module (14) through the first switch (22), and the other path is electrically connected to the user's power terminal (26) after passing through the second switch (23) and the fourth switch (25). The output of the battery module (14) is connected between the second switch (23) and the fourth switch (25) through the third switch (24).

5. The combined heat and power utilization system for waste heat recovery from substation energy storage equipment according to claim 1, characterized in that: The system also includes a floor heating circulation loop, which includes a second outlet of a phase change hot water storage tank (10), a third water pump (17), a fifth solenoid valve (18), a third check valve (19), an inlet of a floor heating terminal (20), an outlet of a floor heating terminal (20), and a second inlet of a phase change hot water storage tank (10) connected in sequence; a second water supply port (16) is provided on the loop between the second outlet of the phase change hot water storage tank (10) and the third water pump (17).

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