CN110806053A - Closed converter valve external cooling system and method based on ground source heat exchange - Google Patents
Closed converter valve external cooling system and method based on ground source heat exchange Download PDFInfo
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- CN110806053A CN110806053A CN201911222963.5A CN201911222963A CN110806053A CN 110806053 A CN110806053 A CN 110806053A CN 201911222963 A CN201911222963 A CN 201911222963A CN 110806053 A CN110806053 A CN 110806053A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/02—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating liquids, e.g. brine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/001—Arrangement or mounting of control or safety devices for cryogenic fluid systems
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Abstract
A closed converter valve external cooling system and method based on ground source heat exchange comprises an intermediate heat exchanger used for transferring heat of an internal cooling system to an external cooling system, a buried heat exchanger is arranged in the external cooling system, the intermediate heat exchanger receives heat transfer media generated by the internal cooling system and transmits the heat transfer media to the buried heat exchanger, the buried heat exchanger discharges system heat load brought by the heat transfer media to the ground, and the cooled heat transfer media are then introduced into the intermediate heat exchanger for circulation. The circulating cooling working medium of the internal cooling system is cooled by the intermediate heat exchanger, the heat transfer medium after receiving heat is transmitted to the buried heat exchanger, the buried heat exchanger discharges the heat load of the system to the ground, soil in the ground is used as a natural cooling medium, and compared with a cooling mode of a water cooling tower, the water resource is greatly saved, the occupied area of ground equipment is greatly reduced compared with an air cooler and the like, and the running noise of the equipment is reduced.
Description
Technical Field
The invention belongs to the field of converter valve cooling, and relates to a closed converter valve external cooling system and method based on soil source heat exchange.
Background
The converter valve is a core device for realizing alternating current-direct current electric energy conversion in a converter station, the temperature of a thyristor chip can be increased due to heat generated by power loss in the operation process of a thyristor in the converter valve, and once the temperature exceeds the highest junction temperature of the thyristor, the thyristor can be damaged, so that the converter valve needs to use a cooling medium to circularly absorb heat and reduce the temperature. The converter valve cooling system is divided into an inner cooling part and an outer cooling part. The cooling medium of the internal cooling system usually adopts deionized water or ionized water added with glycol, and absorbs heat emitted by the converter valve in operation so as to maintain the normal working temperature of the converter valve. The inner cooling system adopts closed circulation to reduce the contact with the atmosphere and prevent various impurities from entering the inner cooling water system, pure water must be injected into an inner cooling loop of the valve before the converter valve is put into operation for the first time, and the cooling water pipes connect radiators of all elements in the valve. The cooling water with lower temperature is pressurized by the circulating water pump and then enters the cooling water pipe to flow into all radiators in the valve, so that the heat generated by the thyristor element and the auxiliary element thereof is absorbed, and the water temperature is increased.
The cold water in the valve, which is heated by heat exchange with the silicon-controlled element of the converter valve, needs to be cooled by secondary cooling (namely an external cooling system) to reduce the water temperature and then enters the converter valve for cooling. The converter valve external cooling system has the function of providing enough cooling capacity, so that the temperature of internal cooling water is controlled within the range capable of ensuring the normal operation of the valve bank. At present, the technical route adopted by the converter valve external cooling system is three modes of air cooling of an air cooler, water cooling of a cooling tower and serial connection of the air cooler and an auxiliary water cooling tower. The air cooling mode saves water resources, but has the following defects: 1) the requirement on meteorological conditions is severe (the cooling effect can be ensured only when the difference between the outdoor air temperature and the inlet water temperature of the converter valve reaches more than 6 ℃); 2) the occupied area of the equipment is large; 3) the operation noise is large. The water cooling method has high cooling efficiency, but has the following defects: 1) the requirement on the reliability of a water source is high; 2) the water consumption is large; 3) the requirement on water quality is high; the operation mode of the air cooling series auxiliary water cooling mode is flexible, the defect of low water resource shortage of a project is overcome, and the problems of insufficient cooling capacity in summer and the like of the air cooling mode can be effectively solved. But the disadvantages are also more obvious: 1) the cost of equipment is highest; 2) the occupied area of equipment is larger, and the equipment becomes a restriction factor of the arrangement of a converter transformer square when the transportation turning space of the converter transformer is influenced; 3) the auxiliary water cooling system is only put into use in summer high-temperature period for a short time every year, so the system maintenance and management workload is large: the auxiliary water cooling system needs to be emptied after the high-temperature period in summer so as to prevent adverse effects such as water quality deterioration and icing in winter; water is required to be supplemented before the high-temperature period in summer in the next year, and the cycle is repeated every year.
Disclosure of Invention
The invention aims to solve the problems that the converter valve external cooling system in the prior art has many restriction factors in the working process and the occupied area of equipment is large, and provides a closed converter valve external cooling system and a closed converter valve external cooling method based on soil source heat exchange, which avoid the limitation of water resource shortage in a water cooling mode and have the characteristics of small occupied area of equipment, no noise in operation and convenience in maintenance and management.
In order to achieve the purpose, the closed converter valve external cooling system based on the ground source heat exchange has the following technical scheme:
the system comprises an intermediate heat exchanger used for transferring heat of an inner cooling system to an outer cooling system, wherein a buried heat exchanger is arranged in the outer cooling system, the intermediate heat exchanger receives heat transfer media generated by the inner cooling system and transfers the heat transfer media to the buried heat exchanger, the buried heat exchanger discharges system heat load brought by the heat transfer media to the ground, and the cooled heat transfer media are then introduced into the intermediate heat exchanger for circulation.
Preferably, in an embodiment of the closed converter valve external cooling system based on the ground source heat exchange, the intermediate heat exchanger is a shell-and-tube heat exchanger, and the buried heat exchanger is a buried U-shaped tube heat exchanger.
Preferably, in an embodiment of the closed converter valve external cooling system based on the soil source heat exchange, the heat transfer medium in the external cooling system is liquid water, and one or more regulating water tanks are arranged in the external cooling system; the intermediate heat exchanger, the buried heat exchanger and the regulating water tank form a closed circulating system through pipelines.
Preferably, in an embodiment of the closed converter valve external cooling system based on the ground source heat exchange, a first circulating water pump is arranged on an outlet pipeline of the buried heat exchanger; and a second circulating water pump is arranged on an outlet pipeline of the regulating water tank.
Preferably, in an embodiment of the closed converter valve external cooling system based on the soil source heat exchange, one or more nitrogen pressure stabilizing systems for regulating the pressure of the heat transfer medium are connected in the external cooling system.
Preferably, in an embodiment of the closed converter valve external cooling system based on the ground source heat exchange, a plurality of groups of external cooling systems connected in parallel or in series are connected with the internal cooling system through the intermediate heat exchanger.
Preferably, in one embodiment of the closed converter valve external cooling system based on the ground source heat exchange, a plurality of buried heat exchangers connected in parallel or in series are arranged to be connected with the intermediate heat exchanger.
The invention also provides a closed converter valve external cooling method based on the ground source heat exchange, which comprises the steps of firstly connecting the intermediate heat exchanger with an internal cooling system and an external cooling system at the same time, and transferring the heat load generated by the converter valve to the intermediate heat exchanger through the circulating cooling working medium of the internal cooling system; then, cooling the circulating cooling working medium of the internal cooling system through the intermediate heat exchanger, and transmitting the heat transfer medium after receiving the heat to the buried heat exchanger; and finally, discharging the system heat load brought by the heat transfer medium to the ground through the buried heat exchanger.
Preferably, the heat transfer medium of the external cooling system adopts liquid water, and the external cooling system is internally provided with a regulating water tank 6; sufficient circulating water is injected into the loop before the external cooling system is put into operation for the first time, the water temperature and flow signals of the circulating water and the circulating cooling working medium temperature and flow signals of the internal cooling system are monitored, and after logical calculation, the external cooling system is controlled to regulate the output flow of the water tank 6.
Compared with the prior art, the closed converter valve external cooling system based on the soil source heat exchange has the following beneficial effects: the intermediate heat exchanger is the main heat exchange equipment of the inner and outer cooling systems, heat generated by the inner cooling system is taken away by heat transfer media in the outer cooling system through heat exchange of the intermediate heat exchanger, the heat load of the buried heat exchanger system is discharged to the ground, soil of the ground is used as natural cooling media, and the cooled heat transfer media are then introduced into the intermediate heat exchanger for circulation, so that the heat exchange efficiency of the system is improved, the closed circulation of outer cold water is realized, water resources are greatly saved compared with a cooling mode of a water cooling tower, the floor area of the above-ground equipment is greatly reduced compared with a cooling mode of an air cooler and air-to-water cooling, and the operation noise of the equipment is also reduced.
Furthermore, the external cooling system of the invention has flexible installation mode, can be provided with a plurality of groups of external cooling systems which are connected in parallel or in series and are connected with the internal cooling system through the intermediate heat exchanger, and also can be provided with a plurality of buried heat exchangers which are connected in parallel or in series and are connected with the intermediate heat exchanger in the same group of external cooling system.
Compared with the prior art, the closed converter valve external cooling method based on the soil source heat exchange has the following beneficial effects: the circulating cooling working medium of the internal cooling system is cooled by the intermediate heat exchanger, the heat transfer medium after receiving heat is transmitted to the buried heat exchanger, the buried heat exchanger discharges the heat load of the system to the ground, soil in the ground is used as a natural cooling medium, and compared with a cooling mode of a water cooling tower, water resources are greatly saved, and compared with an air cooling mode and an air cooling serial auxiliary water cooling mode, the floor area of the above-ground equipment is greatly reduced, and meanwhile, the operation noise of the equipment is also reduced. The cooling method provided by the invention can reduce the difficulty of equipment and operation management on the premise of ensuring the cooling effect, and has a considerable application prospect.
Drawings
FIG. 1 is a schematic diagram of a single-group structure of a closed converter valve external cooling system based on soil source heat exchange;
in the drawings: 1-a converter valve; 2-an internal cooling circulating pump; 3-an intermediate heat exchanger; 4-buried heat exchanger; 5-a first circulating water pump; 6-adjusting the water tank; 7-a second circulating water pump; 8-nitrogen pressure stabilizing system.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the closed converter valve external cooling system based on the ground source heat exchange of the present invention includes an intermediate heat exchanger 3 for transferring the heat of an internal cooling system to an external cooling system, the intermediate heat exchanger 3 is a shell-and-tube heat exchanger, one pipeline is connected to the internal cooling system, the other pipeline is connected to the external cooling system, and the heat transfer medium is liquid water. A buried heat exchanger 4 is arranged in the external cooling system, and the buried heat exchanger 4 adopts a buried U-shaped pipe heat exchanger. The intermediate heat exchanger 3 receives heat transfer medium generated by the inner cooling system and transmits the heat transfer medium to the buried heat exchanger 4, the buried heat exchanger 4 discharges system heat load brought by the heat transfer medium to the ground, and the cooled heat transfer medium is introduced into the intermediate heat exchanger 3 for circulation. One or more regulating water pools 6 are arranged in the external cooling system, and the intermediate heat exchanger 3, the buried heat exchanger 4 and the regulating water pools 6 form a closed circulating system through pipelines. A first circulating water pump 5 is arranged on an outlet pipeline of the buried heat exchanger 4, and a second circulating water pump 7 is arranged on an outlet pipeline of the adjusting water tank 6. One or more nitrogen pressure stabilizing systems 8 for adjusting the pressure of the heat transfer medium are also connected in the external cooling system.
According to the cooling load requirement of the converter valve, a plurality of groups of external cooling systems which are connected in parallel or in series can be arranged to be connected with an internal cooling system through the intermediate heat exchanger 3. The multiple groups of external cooling systems arranged in parallel are simultaneously connected with the internal cooling system through the intermediate heat exchanger 3, or the multiple groups of external cooling systems arranged in series are sequentially connected with the internal cooling system through the intermediate heat exchanger 3. According to the actual engineering requirements, a plurality of parallel or serial buried heat exchangers 4 can be arranged in a group of external cooling systems, the plurality of parallel buried heat exchangers 4 are simultaneously connected with the intermediate heat exchanger 3, or the plurality of serial buried heat exchangers 4 are sequentially connected with the intermediate heat exchanger 3,
a closed converter valve external cooling method based on ground source heat exchange comprises the following steps:
firstly, connecting an intermediate heat exchanger 3 with an internal cooling system and an external cooling system at the same time, wherein a heat transfer medium of the external cooling system adopts liquid water, sufficient circulating water is injected into a loop before the external cooling system is put into operation for the first time, and a heat load generated by a converter valve is transferred to the intermediate heat exchanger 3 through a circulating cooling working medium of the internal cooling system; then, cooling the circulating cooling working medium of the internal cooling system through the intermediate heat exchanger 3, and transmitting the heat transfer medium after receiving the heat to the buried heat exchanger 4; finally, the system heat load brought by the heat transfer medium is discharged to the ground through the buried heat exchanger 4. The external cooling system is provided with an adjusting water tank 6, the adjusting water tank 6 is internally provided with a monitoring device, the water temperature and flow signals of circulating water and the circulating cooling working medium temperature and flow signals of the internal cooling system are monitored in real time, and after logical calculation, the flow of a second circulating water pump 7 is controlled in an interlocking manner so as to meet the heat exchange load requirement of the internal cooling system. And a nitrogen pressure stabilizing system 8 connected in the external cooling system is mainly used for adjusting the pressure of the external cooling circulating water system.
The converter valve external cooling system utilizes the buried U-shaped pipe heat exchanger to finally discharge the heat load of the internal cooling system to the ground. A shell-and-tube heat exchanger (water-water exchange) is used as a main heat exchange device of the internal and external cooling systems, so that the heat exchange efficiency of the system is improved, the closed circulation of external cooling water is realized, and water resources are greatly saved compared with a cooling mode of a water cooling tower. Compared with an air cooler or an air-water cooling mode, the floor area of the ground equipment is greatly reduced, and the running noise of the equipment is reduced.
The external cooling system is flexible in installation mode, a plurality of groups of external cooling systems connected in parallel or in series can be connected with the internal cooling system through the intermediate heat exchanger, a plurality of buried heat exchangers connected in parallel or in series can be arranged in the same group of external cooling system and connected with the intermediate heat exchanger, the flow of the heat transfer medium of the external cooling system is adjusted through the adjusting water tank according to the actual engineering requirements, the requirement of internal cooling load change is met, the pressure of the heat transfer medium is adjusted through the nitrogen pressure stabilizing system, and the system is efficient and reliable in operation.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical solution of the present invention, and it should be understood by those skilled in the art that the technical solution can be modified and replaced by a plurality of simple modifications and replacements without departing from the spirit and principle of the present invention, and the modifications and replacements also fall within the protection scope defined by the claims.
Claims (9)
1. The utility model provides a closed converter valve external cooling system based on ground source heat exchange which characterized in that: the heat exchanger comprises an intermediate heat exchanger (3) used for transferring heat of an inner cooling system to an outer cooling system, wherein a buried heat exchanger (4) is arranged in the outer cooling system, the intermediate heat exchanger (3) receives heat transfer media generated by the inner cooling system and transmits the heat transfer media to the buried heat exchanger (4), the buried heat exchanger (4) discharges system heat load brought by the heat transfer media to the ground, and the cooled heat transfer media are then led into the intermediate heat exchanger (3) to circulate.
2. The closed converter valve external cooling system based on the ground source heat exchange according to claim 1, characterized in that: the intermediate heat exchanger (3) adopts a shell-and-tube heat exchanger, and the buried heat exchanger (4) adopts a buried U-shaped tube heat exchanger.
3. The closed converter valve external cooling system based on the ground source heat exchange according to claim 1, characterized in that:
the heat transfer medium adopts liquid water, and one or more regulating water pools (6) are arranged in the external cooling system;
the intermediate heat exchanger (3), the buried heat exchanger (4) and the regulating water pool (6) form a closed circulation system through pipelines.
4. The closed converter valve external cooling system based on the ground source heat exchange is characterized in that:
a first circulating water pump (5) is arranged on an outlet pipeline of the buried heat exchanger (4);
and a second circulating water pump (7) is arranged on an outlet pipeline of the regulating water tank (6).
5. The closed converter valve external cooling system based on the ground source heat exchange according to claim 1, characterized in that:
one or more nitrogen pressure stabilizing systems (8) for adjusting the pressure of the heat transfer medium are connected in the external cooling system.
6. The closed converter valve external cooling system based on the ground source heat exchange according to any one of claims 1 to 5, is characterized in that: a plurality of groups of external cooling systems which are connected in parallel or in series are connected with the internal cooling system through the intermediate heat exchanger (3).
7. The closed converter valve external cooling system based on the ground source heat exchange according to any one of claims 1 to 5, is characterized in that: a plurality of buried heat exchangers (4) which are connected in parallel or in series are arranged to be connected with the intermediate heat exchanger (3).
8. A closed converter valve external cooling method based on ground source heat exchange is characterized by comprising the following steps: the intermediate heat exchanger (3) is simultaneously connected with an inner cooling system and an outer cooling system, and the heat load generated by the converter valve is transferred to the intermediate heat exchanger (3) through a circulating cooling working medium of the inner cooling system; the intermediate heat exchanger (3) cools the circulating cooling working medium of the internal cooling system and transmits the heat transfer medium after receiving heat to the buried heat exchanger (4); the buried heat exchanger (4) discharges the system heat load brought by the heat transfer medium to the ground.
9. The closed converter valve external cooling method based on the ground source heat exchange according to claim 8, characterized in that: the heat transfer medium of the external cooling system adopts liquid water, and the external cooling system is provided with a regulating water tank 6; sufficient circulating water is injected into the loop before the external cooling system is put into operation for the first time, the water temperature and flow signals of the circulating water and the circulating cooling working medium temperature and flow signals of the internal cooling system are monitored, and after logical calculation, the external cooling system is controlled to regulate the output flow of the water tank (6).
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| CN201911222963.5A CN110806053A (en) | 2019-12-03 | 2019-12-03 | Closed converter valve external cooling system and method based on ground source heat exchange |
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| CN201911222963.5A CN110806053A (en) | 2019-12-03 | 2019-12-03 | Closed converter valve external cooling system and method based on ground source heat exchange |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113179613A (en) * | 2021-04-15 | 2021-07-27 | 华北电力大学 | Converter valve external cooling system and method based on compressed air energy storage high-quality cold source |
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| CN211012062U (en) * | 2019-12-03 | 2020-07-14 | 中国电力工程顾问集团西北电力设计院有限公司 | Closed converter valve external cooling system based on ground source heat exchange |
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2019
- 2019-12-03 CN CN201911222963.5A patent/CN110806053A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102435033A (en) * | 2011-12-01 | 2012-05-02 | 国家电网公司 | Closed type circulation water cooling device and method thereof |
| US20140367068A1 (en) * | 2012-03-05 | 2014-12-18 | Beijing Terasolar Energy Technologies Co, Ltd. | Ground source cooling apparatus for solar energy electricity generating system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113179613A (en) * | 2021-04-15 | 2021-07-27 | 华北电力大学 | Converter valve external cooling system and method based on compressed air energy storage high-quality cold source |
| CN113179613B (en) * | 2021-04-15 | 2023-02-03 | 华北电力大学 | Converter valve external cooling system and method based on compressed air energy storage high-quality cold source |
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