A substation transformer air waste heat recovery deluge valve room anti-freezing heating system

Abstract

The utility model discloses a transformer air waste heat recovery deluge valve chamber anti -icing heating system of transformer substation, it includes main transformer chamber, deluge valve chamber, main transformer chamber waste heat recovery system and mechanical exhaust system, the waste heat recovery system is the waste heat direct utilization system, it is configured through heat recovery exhaust of heat exchanger unit in the waste heat and is directly used for the anti -icing heating of deluge valve chamber, the mechanical exhaust system uses low -level silencer louver natural in -the -main transformer body in main transformer chamber, and sets up variable frequency centrifugal fan and carries out mechanical exhaust at high position. Compared with prior art, the application adopts main transformer chamber waste heat recovery system, and under the condition that the main transformer chamber heat is sufficient, can replace the electric heating of deluge valve chamber, and the energy -conserving and consumption -reducing, realize low carbon energy -conserving.

Description

Technical Field

[0001] This utility model relates to substation transformers, specifically to a substation transformer air waste heat recovery deluge valve chamber antifreeze heating system. Background Technology

[0002] The existing implementation schemes for the recovery and reuse of transformer waste heat are divided into two types: direct utilization and indirect utilization.

[0003] Direct utilization of transformer waste heat involves using it directly for room heating. In winter, the warm air from the transformer room is filtered and purified before being transported to rooms requiring heating via fans and ducts. A similar existing solution is a drying device for transformer production that also utilizes waste heat.

[0004] Indirect utilization of transformer waste heat involves using the heat exchange medium (insulating oil in oil-immersed transformers) within the radiator to heat water via a heat exchanger. This heated water is then used to supply domestic hot water, winter heating, and summer air conditioning. Existing similar solutions include: transformer oil waste heat recycling water heaters and subway transformer waste heat recovery water heaters.

[0005] Currently, there is no relevant experience to draw upon for systems that recover and reuse heat from the air from substation transformers. Therefore, there is an urgent need for a transformer air waste heat recovery heating system designed specifically for the large amount of waste heat generated during transformer operation. During transformer operation, this system can recover waste heat from the air to heat the deluge valve chamber. Summary of the Invention

[0006] The purpose of this invention is to directly introduce hot air from the main transformer room into functional rooms with heating needs during winter, achieving 100% fresh air heating. Because the air quality is low after passing through the oil-lined pipelines in the main transformer room, it is not introduced into personnel activity areas and is directly used for anti-freezing heating of unattended deluge valve rooms. This invention represents a completely new system for substation HVAC systems.

[0007] This application discloses a substation transformer air waste heat recovery deluge valve chamber anti-freezing heating system. The system includes a main transformer room, a deluge valve chamber, a main transformer room waste heat recovery system, and a mechanical exhaust system. The waste heat recovery system is a waste heat direct utilization system, which is configured to recover waste heat in the exhaust air through a heat exchanger unit and directly use it for anti-freezing heating of the deluge valve chamber. The rain shower valve chamber is equipped with a heat exchanger unit, and the main transformer chamber is equipped with the main transformer body; The mechanical exhaust system uses low-position silencer louvers for natural air intake at the main transformer body in the main transformer room, and a variable frequency centrifugal fan is installed at a high position for mechanical exhaust. The main transformer body and the radiator in the main transformer room are set separately. The main transformer body is located indoors, and the radiator is open for ventilation.

[0008] In a preferred embodiment, the heat exchange unit is normally closed in summer and only opened in winter when the rain shower valve chamber requires antifreeze heating, thereby obtaining waste heat from the main transformer room.

[0009] In a preferred embodiment, the rain shower valve chamber is characterized by being equipped with a backup conventional electric heating and electric heat tracing system for auxiliary heat preservation.

[0010] In a preferred embodiment, the heat exchange unit is characterized as a total heat exchanger.

[0011] In a preferred embodiment, the number of variable frequency centrifugal fans is 4-8 units.

[0012] In a preferred embodiment, the main transformer room waste heat recovery system has an air volume of 100-150 CMH and an air exchange rate of 4-8 times per hour.

[0013] In a preferred embodiment, the opening of the mechanical ventilation system is provided with an insect-proof and rodent-proof net.

[0014] In a preferred embodiment, the standby conventional electric heating and electric heat tracing system is configured to be normally closed when the residual heat in the main transformer room is sufficient.

[0015] In a preferred embodiment, the waste heat recovery system is configured to activate when the indoor temperature of the deluge valve chamber is ≤5°C.

[0016] In a preferred embodiment, the mechanical ventilation system is configured to maintain the temperature of the transformer body below 40°C.

[0017] The main advantages of this utility model are: 1) This application recovers a large amount of waste heat generated by the transformer in the substation during operation by setting up a transformer air waste heat recovery deluge valve chamber antifreeze heating system. Under the condition that the transformer room temperature is ≤40℃ and the deluge valve chamber temperature rises to 5℃, the waste heat in the transformer room is used for deluge valve chamber antifreeze heating, thereby achieving the effect of energy saving.

[0018] The specification of this application contains numerous technical features distributed across various technical solutions. Listing all possible combinations of these technical features (i.e., technical solutions) would make the specification excessively lengthy. To avoid this problem, the various technical features disclosed in the above-described utility model content, the various technical features disclosed in the following embodiments and examples, and the various technical features disclosed in the accompanying drawings can be freely combined to form various new technical solutions (all of which are considered to have been described in this specification), unless such a combination of technical features is technically infeasible. For example, one example discloses feature A+B+C, and another example discloses feature A+B+D+E. Features C and D are equivalent technical means that serve the same function, and technically only one needs to be used; they cannot be used simultaneously. Feature E can technically be combined with feature C. Therefore, the solution A+B+C+D should not be considered as described because it is technically infeasible, while the solution A+B+C+E should be considered as described. Attached Figure Description

[0019] Figure 1 This is a diagram of a waste heat recovery system for the main transformer room according to an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures: 1-Main transformer room; 2-Waste heat recovery system for main transformer room; 3-Insect and rodent-proof netting; 4-Total heat exchanger; 5-Centrifugal fan. Detailed Implementation

[0021] Through meticulous, in-depth, and extensive research, the inventors of this utility model have developed for the first time a transformer air waste heat recovery and deluge valve chamber anti-freezing heating system. Compared with existing technologies, this application recovers a large amount of waste heat generated by substation transformers during operation, and utilizes the waste heat from the transformer room for anti-freezing heating of the deluge valve chamber under conditions where the transformer room temperature is ≤40℃ and the deluge valve chamber temperature rises to 5℃, thereby achieving energy-saving effects.

[0022] Example The present invention will be further described below with reference to the accompanying drawings and embodiments. This embodiment provides a transformer air waste heat recovery deluge valve chamber anti-freeze heating system, the specific structure of which is as follows: Figure 1 As shown.

[0023] The system includes a main transformer room waste heat recovery system and a mechanical exhaust system. The waste heat recovery system is a direct waste heat utilization system. The main transformer room waste heat recovery system is configured to recover waste heat from the exhaust air through a total heat exchanger 4 and directly use it for anti-freeze heating of the deluge valve chamber. The total heat exchanger 4 is as follows: Figure 1 It is shown to be configured in the deluge valve chamber.

[0024] The mechanical exhaust system is configured in the main transformer room 1, and low-position silencer louvers are used for natural air intake at the main transformer body in the main transformer room 1, while a variable frequency centrifugal fan 6 is set at a high position for mechanical exhaust. The transformer body and the radiator in the main transformer room 1 are set separately; the transformer body is set indoors, and the radiator is open for ventilation.

[0025] Optionally, in one embodiment, the total heat exchanger 4 is normally closed in summer and opened when the rain shower valve chamber needs antifreeze heating in winter, so as to obtain waste heat from the main transformer chamber 1.

[0026] Optionally, in one embodiment, the deluge valve chamber is equipped with a backup conventional electric heating and electric heat tracing system for auxiliary heat preservation.

[0027] Optionally, in one embodiment, the number of variable frequency centrifugal fans is 4-8.

[0028] Optionally, in one embodiment, the air volume of the main transformer room waste heat recovery system is 100-150 CMH, and the air exchange rate is 4-8 times per hour.

[0029] Optionally, in one embodiment, the opening of the mechanical ventilation system is provided with an insect-proof and rodent-proof net 3.

[0030] In practical applications, when it is summer and there is no need for heating, the mechanical ventilation system is used to ensure that the temperature of the main transformer room does not exceed 40°C to prevent overheating. When the temperature of the deluge valve room is ≤5°C in winter, i.e., when heating is required, the mechanical ventilation system of the main transformer room, i.e., the exhaust fan, is turned off, and the excess heat of the main transformer room is sent to the deluge valve room through the heat exchange unit, while ensuring the normal operation of the main transformer body.

[0031] The following are the specific implementation effects of this embodiment. In this embodiment, the main transformer body adopts a ventilation method of low-positioned silencer louvers for natural air intake and high-positioned variable frequency centrifugal fans for mechanical exhaust, in order to maintain the exhaust temperature of the main transformer body not exceeding 40°C. Based on its exhaust heat output and exhaust temperature, there is potential for utilization. Specifically, Table 1 shows the specific heat output statistics of the main transformer. Table 1 Specific heat dissipation of the main transformer Since the main transformer operates at 50% load for the longest period in winter, the waste heat recovery system for the main transformer room primarily considers the operating conditions under this load. This embodiment tentatively estimates a 50% load rate, i.e., 9.5kW of heat dissipation from the main transformer itself; the actual amount will depend on actual operating conditions. In winter, the building's external envelope (such as exterior walls, roof, doors, and windows) experiences heat loss due to the temperature difference between indoors and outdoors. According to calculations using Hongye 8.0 load calculation software, the heat dissipation from the main transformer room itself is approximately 7.5kW, and the usable heat from a single main transformer in winter is 2kW. Table 2: Available Heat and Air Volume Matching Table According to the "Code for Design of Heating, Ventilation and Air Conditioning of Industrial Buildings" GB50019-2015, the outdoor design temperature for air conditioning in Hefei, Anhui Province, is -4.2℃, with a relative humidity of 76% in winter; the outdoor design temperature for ventilation in winter is 2.6℃. Taking Hefei as an example, the indoor parameter requirements for heated rooms are shown in Table 3: Table 3 Statistics on Indoor Parameter Requirements for Heated Rooms Based on the interior design parameters and considering the current situation of no heat dissipation load, the exhaust volume is temporarily set at a load rate of 50% and an exhaust temperature of 20℃ as the benchmark. Therefore, the required exhaust volume for each main transformer room is: Where: V—exhaust air volume kg / h; Q—heat dissipation Kw; ρ—air density kg / m3; C—specific heat capacity of air J / (kg.℃); △T—exhaust air temperature difference ℃.

[0032] Therefore, the required exhaust volume for each main transformer room is 274 m³. 3 / h, the waste heat recovery of the three main transformer rooms described in this embodiment can supply approximately 50m² of waste heat to each transformer room. 2 Winter heating requirements for rain shower valve chambers.

[0033] The total heat exchanger described in this embodiment typically refers to a fresh air and exhaust ventilation device containing a total heat exchange core. It can simultaneously exhaust indoor polluted air to the outside and bring in fresh outdoor air, and recover energy by utilizing the temperature and humidity differences between outdoor and indoor air.

[0034] In this embodiment, a total heat exchanger with an air volume of 1200 CMH is installed in the deluge valve chamber. Normally, the main transformer and deluge valve chamber are ventilated using a low-level, sound-absorbing louvered natural air intake and a high-level centrifugal fan for mechanical exhaust, maintaining the exhaust air temperature below 40°C in summer. In winter, when the deluge valve chamber requires anti-freeze heating, the centrifugal fan is turned off and the total heat exchanger is turned on. Waste heat from the exhaust air is recovered and directly used for anti-freeze heating of the deluge valve chamber. When there is sufficient waste heat in the main transformer room, it can replace electric heating in the deluge valve chamber, achieving energy conservation and emission reduction. The specific embodiments described above provide a detailed explanation of the technical solution and beneficial effects of this utility model. It should be understood that the above description is only the most preferred embodiment of this utility model and is not intended to limit this utility model. Any modifications, additions, and equivalent substitutions made within the scope of the principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A substation transformer air waste heat recovery deluge valve chamber antifreeze heating system, characterized in that, The system includes a main transformer room, a deluge valve room, a main transformer room waste heat recovery system, and a mechanical exhaust system. The waste heat recovery system is a waste heat direct utilization system, which is configured to recover waste heat from the exhaust air through a heat exchanger unit and directly use it for anti-freeze heating of the deluge valve room. The rain shower valve chamber is equipped with a heat exchanger unit, and the main transformer chamber is equipped with the main transformer body; The mechanical exhaust system uses low-position silencer louvers for natural air intake at the main transformer body in the main transformer room, and a variable frequency centrifugal fan is installed at a high position for mechanical exhaust. The main transformer body and the radiator in the main transformer room are set separately. The main transformer body is located indoors, and the radiator is open for ventilation.

2. The substation transformer air waste heat recovery deluge valve chamber antifreeze heating system according to claim 1, characterized in that: The heat exchange unit is normally closed in summer and only opened in winter when the rain shower valve chamber needs antifreeze heating, thereby obtaining waste heat from the main transformer room.

3. The substation transformer air waste heat recovery deluge valve chamber antifreeze heating system according to claim 1, characterized in that: The rain shower valve chamber is equipped with a backup conventional electric heating and electric heat tracing system for auxiliary heat preservation.

4. The substation transformer air waste heat recovery deluge valve chamber antifreeze heating system according to claim 1, characterized in that: The heat exchanger unit is a total heat exchanger.

5. The substation transformer air waste heat recovery deluge valve chamber anti-freezing heating system according to claim 1, characterized in that: The number of variable frequency centrifugal fans is 4-8.

6. The substation transformer air waste heat recovery deluge valve chamber antifreeze heating system according to claim 1, characterized in that: The air volume of the main transformer room waste heat recovery system is 100-150 CMH, and the air exchange rate is 4-8 times per hour.

7. The substation transformer air waste heat recovery deluge valve chamber antifreeze heating system according to claim 1, characterized in that: The opening of the mechanical ventilation system is equipped with insect-proof and rodent-proof netting.

8. The substation transformer air waste heat recovery deluge valve chamber antifreeze heating system according to claim 3, characterized in that: The backup conventional electric heating and electric heat tracing system is configured to be normally closed when there is sufficient residual heat in the main transformer room.

9. The substation transformer air waste heat recovery deluge valve chamber anti-freezing heating system according to claim 1, characterized in that: The waste heat recovery system is configured to start when the indoor temperature of the deluge valve chamber is ≤5°C.

10. The substation transformer air waste heat recovery deluge valve chamber antifreeze heating system according to claim 1, characterized in that, The mechanical ventilation system is configured to maintain the temperature of the transformer body below 40°C.

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