CN115839632A - Waste heat utilization system suitable for transformer substation and working method thereof - Google Patents
Waste heat utilization system suitable for transformer substation and working method thereof Download PDFInfo
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- CN115839632A CN115839632A CN202211501022.7A CN202211501022A CN115839632A CN 115839632 A CN115839632 A CN 115839632A CN 202211501022 A CN202211501022 A CN 202211501022A CN 115839632 A CN115839632 A CN 115839632A
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Abstract
The invention relates to the technical field of transformer substations, and provides a waste heat utilization system suitable for a transformer substation and a working method thereof, wherein the waste heat utilization system comprises a transformer, a forced circulation oil pump, an oil-water brazed plate heat exchanger, an oil-antifreeze brazed plate heat exchanger, a water source outdoor heat exchanger, an antifreeze source outdoor heat exchanger and a heat pump air conditioning system; the transformer is connected with a forced circulation oil pump; the forced circulation oil pump is respectively connected with the first input ends of the two heat exchangers through different valves; the first output ends of the heat exchangers are respectively connected to the first input ends of the outdoor heat exchangers; the first output ends of the outdoor heat exchangers are connected to the input end of the heat pump air-conditioning system; the second output ends of the outdoor heat exchangers are respectively connected to the second input ends of the heat exchangers; and the output end of the heat pump air-conditioning system is respectively connected to the second input ends of the two outdoor heat exchangers through different valves. The energy consumption of the air conditioning system is reduced, the effective utilization of the heat energy of low-temperature low-grade products is realized, and the effects of energy conservation and emission reduction are achieved.
Description
Technical Field
The invention relates to the technical field of transformer substations, in particular to a waste heat utilization system suitable for a transformer substation and a working method thereof.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
In areas with lower temperatures in winter, indoor work sites of substations need to supply heat. As a large-scale transformer substation is mostly built in the suburbs, the main forms of the heating heat sources of the large-scale transformer substation are a coal-fired boiler, an electric heater and the like. If the technology of recycling the waste heat of the transformer substation is used for heating of the transformer substation, the problem of heating of the transformer substation in winter can be solved, environmental pollution is reduced, the insulating oil temperature of the transformer is reduced, the problem of insulating aging and failure of the transformer caused by overhigh temperature of an inner coil of the transformer is solved, and the service life of the transformer is prolonged.
In order to fully utilize the heat generated by the transformer, the heat exchanger in the invention patent 'waste heat utilization device of power transformer radiating fins' with the application number of 201520180407.7 and the publication number of 2015.11.11 is formed by connecting a plurality of radiating fins in series, and water and insulating oil are introduced into the hollow flow guide pipeline and the outside of the hollow flow guide pipeline, so that the effect of fully utilizing the waste heat is achieved. The invention patent with the application number of 201520098703.2 and the publication date of 2015.08.26 discloses a substation house heating system based on power transformer loss, which utilizes the heat of transformer insulating oil as the heat of a low-temperature hot water floor radiation radiator to heat a substation in winter. The invention patent with the application number of 201721852551.6 and the publication number of 2018.07.13, namely the 'transformer substation waste heat recovery device', and the invention patent with the application number of 201721839251.4 and the publication number of 2018.08.21, namely the 'hoisting type transformer substation waste heat recovery device', utilize an air source heat pump system to supply hot water in a transformer substation for demand.
According to the analysis of the patents, in order to meet the heat demand for supplying heat to the interior of the transformer substation or for living and the like, the best means for utilizing the waste heat of the transformer substation is to utilize hot air or transformer insulating oil in the transformer substation as a heat source. However, the use of the heat of the transformer insulating oil can achieve higher efficiency considering that a large-sized substation transformer is installed outdoors and the heat loss using the indoor hot air is higher than that using the transformer insulating oil. In areas with lower temperature in winter, the outdoor temperature in winter can reach minus 30 ℃, and the freezing point of the #25 transformer oil used by the transformer is minus 25 ℃, so that the transformer insulating oil flows slowly and is easy to freeze when the outdoor temperature in areas with lower temperature in winter is lower, and the requirement of a heat pump cannot be met only by using the transformer insulating oil as a heat source. And the medium water is used for heat exchange, so that the phenomenon of icing can occur when the temperature is lower than 0 ℃ in winter, and long-term heat exchange cannot be realized.
In conclusion, the utilization of the waste heat of the transformer in the transformer substation is an important link for energy conservation and emission reduction of the power transmission system, has a wide application prospect, and can improve the energy conservation of a power grid and relieve the power supply. Therefore, it is necessary to improve energy efficiency by sufficiently utilizing the residual heat of the substation.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides the waste heat utilization system suitable for the transformer substation and the working method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a waste heat utilization system suitable for a transformer substation.
A waste heat utilization system suitable for a transformer substation comprises a transformer, a forced circulation oil pump, an oil-water brazed plate heat exchanger, an oil-antifreeze brazed plate heat exchanger, a water source outdoor heat exchanger, an antifreeze source outdoor heat exchanger and a heat pump air conditioning system;
the output end of the transformer is connected with the input end of the forced circulation oil pump;
the output end of the forced circulation oil pump is respectively connected with the first input ends of the oil-water brazed plate heat exchanger and the oil-antifreeze brazed plate heat exchanger through different valves;
the first output end of the connecting oil-water brazed plate heat exchanger and the first output end of the oil-antifreeze brazed plate heat exchanger are respectively connected to the first input ends of the water source outdoor heat exchanger and the antifreeze source outdoor heat exchanger;
the first output ends of the water source outdoor heat exchanger and the antifreeze liquid source outdoor heat exchanger are connected to the input end of the heat pump air conditioning system; second output ends of the water source outdoor heat exchanger and the antifreeze liquid source outdoor heat exchanger are respectively connected to second input ends of the oil-water brazed plate heat exchanger and the oil-antifreeze liquid brazed plate heat exchanger;
and the output end of the heat pump air-conditioning system is respectively connected to the second input ends of the water source outdoor heat exchanger and the anti-freezing liquid source outdoor heat exchanger through different valves.
Further, a second output end of the antifreeze liquid source outdoor heat exchanger is connected to a second input end of the oil-water brazed plate heat exchanger through an antifreeze liquid pump.
Further, a second output end of the water source outdoor heat exchanger is connected to the oil-water brazed plate heat exchanger through a water pump.
Further, second output ends of the oil-water brazed plate heat exchanger and the oil-antifreeze brazed plate heat exchanger are connected to the input end of the transformer.
Furthermore, the transformer, the forced circulation oil pump, the oil-water brazed plate heat exchanger and the oil-antifreeze brazed plate heat exchanger are connected through insulating oil pipes.
Further, the heat pump air conditioning system comprises a compressor and an indoor heat exchanger;
and the first output ends of the water source outdoor heat exchanger and the antifreeze liquid source outdoor heat exchanger are connected to the input end of the indoor heat exchanger through the compressor.
Furthermore, a fan is arranged on one side of the indoor heat exchanger.
Further, the heat pump air conditioning system also comprises a throttling device;
and the input end of the indoor heat exchanger is connected to the second input ends of the water source outdoor heat exchanger and the antifreeze liquid source outdoor heat exchanger through the throttling device.
Further, the compressor, the indoor heat exchanger, the throttling device, the water source outdoor heat exchanger and the antifreeze liquid source outdoor heat exchanger are connected through a circulating working medium pipe.
The invention provides a working method of the waste heat utilization system suitable for the transformer substation, which comprises the following steps:
when the temperature is higher than a set value, the insulating oil flowing out of the transformer enters the oil-water brazed plate heat exchanger through a forced oil circulating pump, the temperature of the water is raised through heat exchange between the insulating oil and the water, and the water after heat absorption flows into the water source outdoor heat exchanger to exchange heat with a circulating working medium in a heat pump air conditioning system;
when the temperature is lower than the set value, warm insulating oil flowing out of the transformer enters the oil-antifreeze brazing plate type heat exchanger through the forced oil circulating pump, the temperature of the antifreeze is raised through heat exchange between the insulating oil and the antifreeze, and the antifreeze after absorbing heat flows into the antifreeze outdoor heat exchanger to exchange heat with a circulating working medium in a heat pump air conditioning system.
Compared with the prior art, the invention has the beneficial effects that:
according to the waste heat utilization system suitable for the transformer substation, the transformer substation transformer insulating oil is used as a low-temperature heat source, the temperature is raised through the heat pump, the air conditioning system supplies heat to the transformer substation in winter, the energy consumption of the air conditioning system is reduced, the effective utilization of the heat energy of low-temperature low-quality products is realized, and the effects of energy conservation and emission reduction are achieved.
According to the waste heat utilization system suitable for the transformer substation, when the outdoor temperature is low in winter, heat is exchanged by using oil and an anti-freezing solution, and the problem that the heat exchange is difficult due to the fact that the temperature of northern winter reaches below zero and the freezing point of water for exchanging heat with insulating oil is reached is solved.
The two systems are connected in parallel, and when the outdoor temperature is high, heat exchange is carried out by using oil and water with good heat conductivity as a low-temperature heat source of the heat pump, so that the utilization rate of waste heat is increased; when the outdoor temperature is low, the system for exchanging heat by using oil and antifreeze is used, so that the condition that the water is solidified and the heat exchange is difficult due to the over-low temperature in winter is prevented. The two systems are better used to ensure uninterrupted heating in the heating period in winter in the north.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description, serve to explain the invention and not to limit the invention.
Fig. 1 is a structural diagram of a waste heat utilization system applied to a substation according to embodiment 1 of the present invention.
The system comprises a transformer 1, a transformer 2, a forced circulation oil pump 3, an insulating oil pipe water feeding heat exchange system valve 4, an insulating oil pipe antifreeze liquid heat exchange system valve 5, an oil-water brazed plate heat exchanger 6, an oil-antifreeze liquid brazed plate heat exchanger 7, a water pump 8, an antifreeze liquid pump 9, a water source outdoor heat exchanger 10, an antifreeze liquid source outdoor heat exchanger 11, a circulating working medium pipe water feeding heat exchange system valve 12, a circulating working medium pipe antifreeze liquid heat exchange system valve 13, a compressor 14, an indoor heat exchanger 15, a throttling device 16 and a fan.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only terms of relationships determined for convenience of describing structural relationships of the parts or elements of the present invention, and are not intended to refer to any parts or elements of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example 1
As shown in fig. 1, an embodiment 1 of the present invention provides a waste heat utilization system suitable for a substation, including: the system comprises a transformer, a forced circulation oil pump, an oil-water brazed plate heat exchanger, an oil-antifreeze brazed plate heat exchanger, a water source outdoor heat exchanger, an antifreeze source outdoor heat exchanger and a heat pump air conditioning system; the heat pump air conditioning system comprises a compressor, an indoor heat exchanger and a throttling device.
The output end of the transformer is connected with the input end of the forced circulation oil pump; the output end of the forced circulation oil pump is respectively connected with the first input ends of the oil-water brazed plate heat exchanger and the oil-antifreeze brazed plate heat exchanger through different valves; the first output end of the connecting oil-water brazed plate heat exchanger and the first output end of the connecting oil-antifreeze brazed plate heat exchanger are respectively connected to the first input ends of the water source outdoor heat exchanger and the antifreeze source outdoor heat exchanger; the first output ends of the water source outdoor heat exchanger and the antifreeze liquid source outdoor heat exchanger are connected to the input end of the heat pump air conditioning system; second output ends of the water source outdoor heat exchanger and the antifreeze liquid source outdoor heat exchanger are respectively connected to second input ends of the oil-water brazed plate heat exchanger and the oil-antifreeze liquid brazed plate heat exchanger; and the output end of the heat pump air-conditioning system is respectively connected to the second input ends of the water source outdoor heat exchanger and the antifreeze source outdoor heat exchanger through different valves.
And a second output end of the antifreeze liquid source outdoor heat exchanger is connected to a second input end of the oil-water brazed plate heat exchanger through an antifreeze liquid pump. And a second output end of the water source outdoor heat exchanger is connected to the oil-water brazed plate heat exchanger through a water pump.
And the second output ends of the oil-water brazed plate heat exchanger and the oil-antifreeze brazed plate heat exchanger are connected to the input end of the transformer.
The transformer, the forced circulation oil pump, the oil-water brazed plate heat exchanger and the oil-antifreeze brazed plate heat exchanger are connected through insulating oil pipes.
And the first output ends of the water source outdoor heat exchanger and the antifreeze liquid source outdoor heat exchanger are connected to the input end of the indoor heat exchanger through the compressor. And the input end of the indoor heat exchanger is connected to the second input ends of the water source outdoor heat exchanger and the antifreeze liquid source outdoor heat exchanger through the throttling device. The compressor, the indoor heat exchanger, the throttling device, the water source outdoor heat exchanger and the anti-freezing liquid source outdoor heat exchanger are connected through a circulating working medium pipe.
The system is connected with two groups of heat exchange systems in parallel with an insulating oil pipe, and the opening and closing of the systems are controlled by valves, wherein one group is a water heat exchange system, and the other group is an antifreeze liquid heat exchange system. The two groups of heat exchange systems connected in parallel are connected in series with the heat pump air conditioning system to form a complete waste heat utilization system suitable for transformer substations in northern regions.
When the outdoor temperature is above 0 ℃, the antifreeze system is in a closed state by using the water heat exchange system and controlling the valve. When the device is operated, the high-temperature insulating oil flowing out of the transformer 1 enters the oil-water brazed plate heat exchanger 5 through the forced oil circulating pump 2, and the water temperature is increased through heat exchange; the water after absorbing heat flows into the water source outdoor heat exchanger 9 under the driving of the water pump 7 to exchange heat with the circulating working medium in the heat pump air conditioning system.
When the outdoor temperature is below 0 ℃, the antifreeze heat exchange system is used, and the water system is in a closed state by controlling the valve. When the anti-freezing liquid brazing plate type heat exchanger operates, high-temperature insulating oil flowing out of the transformer 1 enters the oil-anti-freezing liquid brazing plate type heat exchanger 6 through the forced oil circulating pump 2, and the temperature of the anti-freezing liquid is raised through heat exchange; the antifreeze after absorbing heat flows into the antifreeze source outdoor heat exchanger 10 to exchange heat with the circulating working medium in the heat pump air conditioning system under the drive of the antifreeze pump 8.
The heat pump air conditioning system in the system is connected with two groups of heat exchange systems in parallel in series and comprises a circulating working medium, a compressor 13, an outdoor heat exchanger (2), a thermal expansion throttle valve 15, an indoor heat exchanger 14 and a fan 16, wherein the compressor 13, the outdoor heat exchanger, the thermal expansion throttle valve 15 and the indoor heat exchanger are connected in series through a circulating working medium pipe, and the fan 16 is used for assisting heat dissipation beside the indoor heat exchanger. The working condition flow is as follows:
when the outdoor temperature is above 0 ℃, the antifreeze solution system is in a closed state by using the water heat exchange system and controlling the valve. At the water source outdoor heat exchanger 9, the water after heat absorption and temperature rise is utilized to heat the low-pressure low-temperature circulating working medium, the water is pressurized by the compressor 13 to flow into the indoor heat exchanger 14 for heat dissipation, and then flows into the antifreeze source outdoor heat exchanger 10 after being throttled by the throttling device 15 to continue heat absorption and temperature rise with the water heat exchange 9, and the cycle work is carried out;
when the outdoor temperature is below 0 ℃, the antifreeze heat exchange system is used, and the water system is in a closed state by controlling the valve. At the outdoor heat exchanger 10 of the antifreeze source, the antifreeze solution which absorbs heat and is heated is used for heating the low-pressure low-temperature circulating working medium, the antifreeze solution is pressurized by the compressor 13 to flow into the indoor heat exchanger 14 for releasing heat, and then flows into the outdoor heat exchanger 9 of the water source after being throttled by the throttling device 15 to continue absorbing heat and heating with the heat exchange 10 of the antifreeze solution, and the cycle work is carried out.
In the air conditioning system, two brazing plate type heat exchangers are connected in series with a transformer, a series of metal sheets with certain corrugated shapes are stacked and brazed to form the novel efficient heat exchanger, thin rectangular channels are formed among various sheet bars, and heat exchange is carried out through the sheet bars. The heat transfer coefficient of the brazed plate heat exchanger is higher than that of the conventional shell-and-tube heat exchanger under the same flow resistance and pump power consumption.
The two systems are connected in parallel, so that the system can still be normally used in a lower outdoor environment in northern areas, and meanwhile, the system also has higher heat exchange efficiency, and the waste heat of the transformer is reasonably utilized.
Under the working condition in winter, the high-temperature insulating oil flowing out of the transformer 1 flows into the brazing plate type heat exchanger through the forced circulation oil pump 2, and exchanges heat with a heat exchange working medium in the brazing plate type heat exchanger to extract heat generated during transformer transformation of the transformer.
When the outdoor temperature is higher than 0 ℃, opening the valve 3 and the valve 11, keeping the valve 4 and the valve 12 closed, enabling the insulating oil to exchange heat with water through the brazing plate type heat exchanger 5, driving the water with the increased temperature after heat exchange to flow into the outdoor heat exchanger 9 under the driving of the water pump 7, transferring heat to the heat pump air conditioner in a heating mode through the opened valve 11 through heat exchange, enabling the circulating working medium to absorb the heat transferred from the transformer to be heated, pressurizing the water through the compressor 13 and then flowing into the indoor heat exchanger 14, discharging the heat from the high-temperature high-pressure circulating working medium to the indoor to be cooled into high-pressure liquid, throttling and expanding the high-pressure liquid into low-pressure liquid through flowing into the throttle valve 15, entering the outdoor heat exchanger 9, absorbing the heat through the evaporation process to become low-pressure steam, and then entering the compressor to be compressed and pressurized into the high-temperature high-pressure liquid, thus the circulation work.
When the outdoor temperature is lower than 0 ℃, the valve 4 and the valve 12 are opened, the valve 3 and the valve 11 are closed, high-temperature insulating oil enters the brazing plate type heat exchanger 6 to exchange heat with the antifreeze solution, the antifreeze solution absorbing heat enters the outdoor heat exchanger 10 by the antifreeze solution pump 8, the heat is transferred to the heat pump air conditioner through the opened valve 12, the circulating working medium absorbs the heat transferred from the transformer to heat up, the circulating working medium is pressurized by the compressor 13 and then enters the indoor heat exchanger 14, the high-temperature and high-pressure circulating working medium discharges heat indoors to be cooled into high-pressure liquid, the high-temperature and high-pressure circulating working medium flows into the throttle valve 15 to be throttled and expanded into low-pressure liquid, the low-pressure liquid enters the outdoor heat exchanger 10, the low-pressure vapor is absorbed by the evaporation process, and the high-temperature and high-pressure liquid is compressed and pressurized by the compressor, and the cycle operation is carried out.
In the indoor part at the tail end, heat required by low-pressure circulating working medium steam is provided by high-temperature insulating oil flowing out of a transformer, heat is condensed and released in the indoor heat exchanger 14, the fan 16 works to blow the heat released by the circulating working medium into the room, so that the indoor temperature is increased, and the purpose of heating the room in winter is achieved.
In the transformer insulating oil circulating part, high-temperature oil flowing out of a transformer 1 flows into a brazed plate heat exchanger under the driving of a forced circulation oil pump 2, heat is transferred to steam of a low-voltage refrigerator, and the transformer insulating oil returns to the transformer 1 after being cooled to maintain the normal operation of the transformer. The circulation of the insulating oil of the transformer is realized, the heat generated during the operation of the transformer is cooled, the normal operation of the transformer is ensured, and meanwhile, the heat is supplied to the system.
Compared with a conventional substation waste heat utilization system, the waste heat utilization system applicable to the substation provided by the embodiment has the advantages that the heat exchange part of the transformer insulating oil and the antifreeze is added, and the brazed plate heat exchanger with a higher heat exchange coefficient is selected to replace the conventional shell and tube heat exchanger, so that the application range of the system is enlarged, and the heat exchange efficiency of the system is improved.
The waste heat utilization system suitable for the transformer substation, provided by the embodiment, makes full use of the self-loss heat of the power generated by the transformer substation during the transformation, supplies heat to the transformer substation in winter, reduces the energy consumption of an air conditioning system, realizes the effective utilization of low-grade heat energy, and achieves the effects of energy conservation and emission reduction.
The utility model provides a waste heat utilization system suitable for transformer substation designs suitable system form to when solving northern area winter temperature and reaching below zero, reach the freezing point with the medium water of insulating oil heat transfer, the unable condition of continuing work of waste heat utilization system.
The waste heat utilization system suitable for the transformer substation that this embodiment provided rationally constructs the system, makes northern area transformer substation's waste heat utilization bigger.
Example 2
An embodiment 2 of the present invention provides a working method of a waste heat utilization system suitable for a substation as in embodiment 1, including the following steps:
under the working condition in winter, the high-temperature insulating oil flowing out of the transformer 1 flows into the brazing plate type heat exchanger through the forced circulation oil pump 2, and exchanges heat with a heat exchange working medium in the brazing plate type heat exchanger to extract heat generated during transformer transformation of the transformer.
When the outdoor temperature is higher than 0 ℃, opening the valve 3 and the valve 11, keeping the valve 4 and the valve 12 closed, enabling the insulating oil to exchange heat with water through the brazing plate type heat exchanger 5, driving the water with the increased temperature after heat exchange to flow into the outdoor heat exchanger 9 under the driving of the water pump 7, transferring heat to the heat pump air conditioner in a heating mode through the opened valve 11 through heat exchange, enabling the circulating working medium to absorb the heat transferred from the transformer to be heated, pressurizing the water through the compressor 13 and then flowing into the indoor heat exchanger 14, discharging the heat from the high-temperature high-pressure circulating working medium to the indoor to be cooled into high-pressure liquid, throttling and expanding the high-pressure liquid into low-pressure liquid through flowing into the throttle valve 15, entering the outdoor heat exchanger 9, absorbing the heat through the evaporation process to become low-pressure steam, and then entering the compressor to be compressed and pressurized into the high-temperature high-pressure liquid, thus the circulation work.
When the outdoor temperature is lower than 0 ℃, the valve 4 and the valve 12 are opened, the valve 3 and the valve 11 are closed, high-temperature insulating oil enters the brazing plate type heat exchanger 6 to exchange heat with the antifreeze solution, the antifreeze solution absorbing heat enters the outdoor heat exchanger 10 by the antifreeze solution pump 8, the heat is transferred to the heat pump air conditioner through the opened valve 12, the circulating working medium absorbs the heat transferred from the transformer to heat up, the circulating working medium is pressurized by the compressor 13 and then enters the indoor heat exchanger 14, the high-temperature and high-pressure circulating working medium discharges heat indoors to be cooled into high-pressure liquid, the high-temperature and high-pressure circulating working medium flows into the throttle valve 15 to be throttled and expanded into low-pressure liquid, the low-pressure liquid enters the outdoor heat exchanger 10, the low-pressure vapor is absorbed by the evaporation process, and the high-temperature and high-pressure liquid is compressed and pressurized by the compressor, and the cycle operation is carried out.
In the indoor part at the tail end, heat required by low-pressure circulating working medium steam is provided by high-temperature insulating oil flowing out of a transformer, heat is condensed and released in the indoor heat exchanger 14, the fan 16 works to blow the heat released by the circulating working medium into the room, so that the indoor temperature is increased, and the purpose of heating the room in winter is achieved.
In the transformer insulating oil circulating part, high-temperature oil flowing out of a transformer 1 flows into a brazed plate heat exchanger under the driving of a forced circulation oil pump 2, heat is transferred to steam of a low-voltage refrigerator, and the transformer insulating oil returns to the transformer 1 after being cooled to maintain the normal operation of the transformer.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a waste heat utilization system suitable for transformer substation which characterized in that: the system comprises a transformer, a forced circulation oil pump, an oil-water brazed plate heat exchanger, an oil-antifreeze brazed plate heat exchanger, a water source outdoor heat exchanger, an antifreeze source outdoor heat exchanger and a heat pump air conditioning system;
the output end of the transformer is connected with the input end of the forced circulation oil pump;
the output end of the forced circulation oil pump is respectively connected with the first input ends of the oil-water brazed plate heat exchanger and the oil-antifreeze brazed plate heat exchanger through different valves;
the first output end of the connecting oil-water brazed plate heat exchanger and the first output end of the connecting oil-antifreeze brazed plate heat exchanger are respectively connected to the first input ends of the water source outdoor heat exchanger and the antifreeze source outdoor heat exchanger;
the first output ends of the water source outdoor heat exchanger and the antifreeze liquid source outdoor heat exchanger are connected to the input end of the heat pump air conditioning system; second output ends of the water source outdoor heat exchanger and the antifreeze liquid source outdoor heat exchanger are respectively connected to second input ends of the oil-water brazed plate heat exchanger and the oil-antifreeze liquid brazed plate heat exchanger;
and the output end of the heat pump air-conditioning system is respectively connected to the second input ends of the water source outdoor heat exchanger and the anti-freezing liquid source outdoor heat exchanger through different valves.
2. The waste heat utilization system suitable for the transformer substation of claim 1, characterized in that: and a second output end of the antifreeze liquid source outdoor heat exchanger is connected to a second input end of the oil-water brazed plate heat exchanger through an antifreeze liquid pump.
3. The waste heat utilization system suitable for the transformer substation of claim 1, characterized in that: and a second output end of the water source outdoor heat exchanger is connected to the oil-water brazed plate heat exchanger through a water pump.
4. The waste heat utilization system suitable for the transformer substation of claim 1, characterized in that: and the second output ends of the oil-water brazed plate heat exchanger and the oil-antifreeze brazed plate heat exchanger are connected to the input end of the transformer.
5. The waste heat utilization system suitable for the transformer substation of claim 1, characterized in that: the transformer, the forced circulation oil pump, the oil-water brazed plate heat exchanger and the oil-antifreeze brazed plate heat exchanger are connected through insulating oil pipes.
6. The waste heat utilization system suitable for the transformer substation of claim 1, characterized in that: the heat pump air conditioning system comprises a compressor and an indoor heat exchanger;
and the first output ends of the water source outdoor heat exchanger and the antifreeze liquid source outdoor heat exchanger are connected to the input end of the indoor heat exchanger through the compressor.
7. The waste heat utilization system suitable for the transformer substation of claim 6, characterized in that: and a fan is arranged on one side of the indoor heat exchanger.
8. The waste heat utilization system suitable for the transformer substation of claim 6, characterized in that: the heat pump air conditioning system also comprises a throttling device;
and the input end of the indoor heat exchanger is connected to the second input ends of the water source outdoor heat exchanger and the anti-freezing liquid source outdoor heat exchanger through the throttling device.
9. The waste heat utilization system suitable for the transformer substation of claim 8, characterized in that: the compressor, the indoor heat exchanger, the throttling device, the water source outdoor heat exchanger and the antifreeze liquid source outdoor heat exchanger are connected through a circulating working medium pipe.
10. The method for operating a waste heat utilization system for a substation according to any one of claims 1 to 9, characterized in that: the method comprises the following steps:
when the temperature is higher than a set value, the insulating oil flowing out of the transformer enters the oil-water brazed plate heat exchanger through a forced oil circulating pump, the temperature of the water is raised through heat exchange between the insulating oil and the water, and the water after heat absorption flows into the water source outdoor heat exchanger to exchange heat with a circulating working medium in a heat pump air conditioning system;
when the temperature is lower than the set value, warm insulating oil flowing out of the transformer enters the oil-antifreeze brazing plate type heat exchanger through the forced oil circulating pump, the temperature of the antifreeze is raised through heat exchange between the insulating oil and the antifreeze, and the antifreeze after absorbing heat flows into the antifreeze outdoor heat exchanger to exchange heat with a circulating working medium in a heat pump air conditioning system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211501022.7A CN115839632A (en) | 2022-11-28 | 2022-11-28 | Waste heat utilization system suitable for transformer substation and working method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211501022.7A CN115839632A (en) | 2022-11-28 | 2022-11-28 | Waste heat utilization system suitable for transformer substation and working method thereof |
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