CN116294378A - Full-closed circulating water cooling device, method and application for polysilicon production - Google Patents
Full-closed circulating water cooling device, method and application for polysilicon production Download PDFInfo
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- CN116294378A CN116294378A CN202310329243.9A CN202310329243A CN116294378A CN 116294378 A CN116294378 A CN 116294378A CN 202310329243 A CN202310329243 A CN 202310329243A CN 116294378 A CN116294378 A CN 116294378A
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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
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D3/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium flows in a continuous film, or trickles freely, over the conduits
- F28D3/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium flows in a continuous film, or trickles freely, over the conduits with tubular conduits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
- F28F25/04—Distributing or accumulator troughs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
- F28F25/06—Spray nozzles or spray pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F2025/005—Liquid collection; Liquid treatment; Liquid recirculation; Addition of make-up liquid
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The invention discloses a fully-closed circulating water cooling device for polysilicon production, which comprises: the closed air cooling tower comprises a closed air cooling tower main body, wherein a plurality of air cooling tube bundles are arranged in the closed air cooling tower main body, and the air cooling tube bundles are arranged vertically; the closed wet cooling tower comprises a closed wet cooling tower main body, wherein a plurality of wet cooling tube bundles are arranged in the closed wet cooling tower main body, and a spray pipe is arranged at the top of the closed wet cooling tower main body; the air cooling circulation water inlet pipe and the closed air cooling tower main body are connected in series to form a first closed loop to form an air cooling circulation cooling system; the wet cooling circulation water inlet pipe and the closed wet cooling tower main body are connected in series to form a second closed loop to form a wet cooling circulation cooling system; after the first closed loop and the second closed loop are connected in parallel, the first closed loop and the second closed loop are connected in series with a circulating water pump (3) and a plurality of parallel whole plant heat exchange devices to form a fully closed circulating water cooling loop for polysilicon production, and the fully closed circulating water cooling loop is connected into a constant pressure water supplementing device. Also discloses a corresponding cooling method and application of the purified oxygen in the production of polysilicon.
Description
Technical Field
The invention relates to the technical field of circulating water cooling in polysilicon production by using polycrystalline silicon, industrial silicon and Siemens method, in particular to a fully-closed circulating water cooling device, method and application for polysilicon production.
Background
The circulating water system comprises an open cooling mode and a closed cooling mode, and the closed circulating cooling system becomes a main flow process selection of circulating water cooling heat exchange under the condition of water resource and electric power resource deficiency.
The closed circulating water cooling system takes a tubular air cooler as a medium and is used for indirectly cooling industrial circulating water. The industrial closed circulating water cooling system consists of an internal circulation system, an external circulation system and a forced air flow system, wherein the internal circulation system takes soft water or demineralized water in a pipe as a refrigerant, heat of a process stream to be cooled is removed from the process heat exchange equipment, so that the temperature of circulating backwater is increased (the temperature is usually 10 ℃ in design), the circulating backwater is returned into an air cooler pipe of the closed circulating water cooling system, and the heat of the circulating backwater is taken away by air and/or a water film forced to flow outside the pipe, so that the circulating backwater is sent into the process heat exchange equipment through a circulating water pump after being cooled, and the circulating backwater is circulated.
The circulating water cooling system is a main heat exchange mode in the production and operation process of the polysilicon, has great influence on index control in the production process, so that economic and stable operation of the circulating water cooling system in the production process of the polysilicon becomes an important control point of the production cost of the polysilicon, and in the scene of deficient water and electricity resources and large temperature difference, how to make electricity saving and water saving and long-term winterization is an urgent technical problem to be solved by the circulating water cooling system.
CN211199470U relates to the field of solar silicon wafers, and is a device for circulating cooling water for a polysilicon ingot furnace. The water chiller is characterized in that one end of the water chiller is connected with a buffer water tank, the other end of the water chiller is connected with a front valve, and the other end of the front valve is respectively connected with a rear valve and an external circulating water pump; the other end of the external circulating water pump is connected with a cache water tank, and the other end of the cache water tank is connected with a water tank; the other end of the rear valve is connected with the water tank; one end of the internal circulating water pump is connected with the buffer water tank, and the other end of the internal circulating water pump is connected with the ingot furnace. Due to the adoption of the technical scheme, the system is in an internal closed type independent circulation, and has the advantages of reducing scaling, reducing the loss of a cold source, increasing smoothness, flexibly changing the operating frequency of the pump through the change of the load of a heat source, so that the aim of energy conservation and stability is fulfilled, however, the system cannot realize long-term winterization, and the adopted mode is a buffer water tank, so that the system can be kept stable only at the moment when circulating water enters the system, and the pressure of the system at other moments is still difficult to ensure to be stable. CN202131390U discloses a circulating cooling water energy-saving device for polycrystalline ingot production, which comprises a cooling tower 1, an external circulating water tank 2, an external circulating water pump 12, an external circulating water inlet pipe 10, a water inlet and a water outlet of group a of a heat exchanger 5 and an external circulating water return pipe 11 which are sequentially connected in series to form a first closed loop to form an external circulating cooling system; the water inlets and water outlets of the inner circulating water tank 3, the inner circulating water pump 4 and the B group of the heat exchanger 5, the inner circulating water inlet pipe 6, the water cooling system of the polysilicon ingot furnace 7 and the inner circulating water return pipe 6 are sequentially connected in series to form a second closed loop to form an inner circulating cooling system. The device not only meets the requirement of circulating cooling water for producing the polycrystalline silicon cast ingot, but also can save investment cost, reduce operation cost and ensure product quality; the requirements of energy conservation, high efficiency, stable performance and the like of the circulating water device can be met; however, the internal circulating water pump inlet has no buffer equipment or other alternatives, so that the operation stability of the system is not high.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the technical scheme that the fully-closed circulating water cooling device for polysilicon production is provided, an inlet buffer pool of an internal circulating water pump is canceled, a constant-pressure water supplementing device is added to stabilize the pressure of the system, so that the complete closed circulation of the internal circulating water is realized, the lift of the circulating pump can be increased by 30 meters from 55 meters, the shaft power of the water pump is reduced, and the electric energy is saved by 45% compared with the prior technical scheme; the air cooler is arranged in a vertical mode, on one hand, heat exchange can be carried out by utilizing transverse natural ventilation and an air cooling tube bundle, the running frequency and the number of air cooling variable frequency fans are reduced, the arrangement mode can shorten the operation time of a wet cooling tube bundle and spray water by more than 720 hours under the condition of the same air temperature, water is saved by 10%, electric energy is saved by 30% compared with other arrangement modes, and the effect and the efficiency of circulating water cooling are remarkably improved; on the other hand, the air cooler is arranged in a vertical mode, accumulated water in a single tube bundle can be completely drained when the heat load is reduced in production, and the problem of tube bundle frost cracking during low-temperature operation of the air cooler in winter is effectively solved.
In one aspect, the present invention provides a fully closed circulating water cooling apparatus for polysilicon production, comprising:
the closed air cooling tower (1), wherein the closed air cooling tower (1) comprises a closed air cooling tower main body, a plurality of air cooling tube bundles are arranged in the closed air cooling tower main body, and the air cooling tube bundles are arranged vertically;
the closed wet cooling tower (2), wherein the closed wet cooling tower (2) comprises a closed wet cooling tower main body, a plurality of wet cooling tube bundles are arranged in the closed wet cooling tower main body, and a spray pipe is arranged at the top of the closed wet cooling tower main body;
the air cooling circulation water inlet pipe and the closed air cooling tower main body are connected in series to form a first closed loop to form an air cooling circulation cooling system;
the wet cooling circulation water inlet pipe and the closed wet cooling tower main body are connected in series to form a second closed loop to form a wet cooling circulation cooling system;
after the first closed loop and the second closed loop are connected in parallel, the first closed loop and the second closed loop are connected in series with a circulating water pump (3) and a plurality of parallel whole-plant heat exchange devices to form a fully closed circulating water cooling loop for producing polysilicon; the first closed loop and the second closed loop are connected in parallel, and then a constant-pressure water supplementing device is connected between the first closed loop and the circulating water pump.
Preferably, the constant pressure water supplementing device comprises a constant pressure water supplementing tank (61) and a constant pressure water supplementing pump (62), a fourth valve (63) is arranged between the constant pressure water supplementing tank (61) and the constant pressure water supplementing pump (62) in series, and a fifth valve (64) and a sixth valve (65) are arranged between the constant pressure water supplementing pump (62) and an inlet of the circulating water pump.
Preferably, the first blades are arranged above the air cooling tube bundles, so that the air flow rate and the cooling efficiency are improved.
Preferably, a second blade is arranged between the spray pipe and the wet cooling pipe bundle, and the cooling liquid sprayed out of the spray pipe is atomized and homogenized through the second blade, so that the consumption of the cooling liquid is reduced while the wet cooling efficiency is ensured.
Preferably, the cooling liquid is cooling water.
Preferably, a first valve (11) is arranged in the first closed circuit.
Preferably, a second main valve (21) and a second branch valve (22) are arranged in the second closed loop.
Preferably, a third valve (5) is arranged in the parallel circuit after the first closed circuit is connected in parallel with the second closed circuit.
Preferably, a seventh valve (66) is arranged between the outlet of the circulating water pump (3) and the plurality of whole-plant heat exchange devices.
Preferably, a plurality of parallel whole plant heat exchange devices are respectively connected with the main circuit of the fully-closed circulating water cooling loop through two valves.
A second aspect of the present invention is to provide a totally-enclosed circulating water cooling method for polycrystalline silicon production, comprising:
the circulating water is sent into a fully-closed circulating water cooling loop;
heat of the process stream to be cooled is removed from the plurality of whole plant heat exchange devices through the circulating water, thereby raising the temperature of the circulating backwater;
the circulating backwater returns to a plurality of air cooling tube bundles of a closed air cooling tower of a closed circulating water cooling loop, and part of heat of the circulating backwater is taken away by air forced to flow outside the tubes of the plurality of air cooling tube bundles;
sending the circulating backwater subjected to partial heat removal treatment into a plurality of wet cooling tube bundles of a closed wet cooling tower, and removing partial heat of the circulating backwater through a water film or water mist generated by a spray pipe to cool the circulating backwater;
the water is sent into heat exchange equipment of the whole plant again through a circulating water pump (3) for circulating cooling;
and detecting the water pressure in the totally-closed circulating water cooling loop, comparing the water pressure value with a constant pressure threshold value, and starting the constant pressure water supplementing device to conduct water pressure compensation when the difference between the water pressure value and the constant pressure threshold value exceeds a certain threshold value.
A third aspect of the present invention is to provide the use of a fully closed circulating water cooling apparatus in the production of polysilicon.
The beneficial effects of the invention include:
(1) The inlet buffer pool of the internal circulating water pump is canceled, a constant-pressure water supplementing device is added to stabilize the pressure of the system, so that complete closed-loop circulation of the internal circulating water is realized, the lift of the circulating pump can be increased by 30 meters from 55 meters, the shaft power of the water pump is reduced, and electric energy is saved by 45% compared with the original technical scheme;
(2) The arrangement mode of the air cooler adopts vertical arrangement, on one hand, the transverse natural ventilation and the air cooling tube bundles can be utilized to carry out heat exchange, the running frequency and the number of the air cooling variable frequency fans are reduced, the arrangement mode can shorten the operation time of the wet cooling tube bundles and spray water to be longer than 720 hours under the condition of the same air temperature, the water is saved by 10 percent, the electric energy is saved by 30 percent compared with other arrangement modes, and the effect and the efficiency of circulating water cooling are obviously improved; on the other hand, the air cooler is arranged in a vertical mode, accumulated water in a single tube bundle can be completely drained when the heat load is reduced in production, and the problem of tube bundle frost cracking during low-temperature operation of the air cooler in winter is effectively solved.
Drawings
Fig. 1 is a schematic diagram of a fully-closed circulating water cooling device according to the present invention.
Fig. 2 is a schematic diagram of the overall structure of the vertical arrangement of the air cooling tube bundles according to the invention.
Fig. 3 is a schematic view of a vertical arrangement partial enlarged three-dimensional structure of an air cooling tube bundle according to the present invention.
Fig. 4 is a schematic diagram of a vertical top view overall structure of an air cooling tube bundle according to the present invention.
Detailed Description
In order to better understand the above technical solutions, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
Example 1
Referring to fig. 1-4, the present embodiment provides a fully closed circulating water cooling apparatus for polysilicon production, comprising:
the closed air cooling tower 1, wherein the closed air cooling tower 1 comprises a closed air cooling tower main body, a plurality of air cooling tube bundles are arranged in the closed air cooling tower main body, and the air cooling tube bundles are arranged vertically (more preferably, blades are arranged above the air cooling tube bundles, so that the air flow rate and the cooling efficiency are improved);
the closed wet cooling tower 2, wherein the closed wet cooling tower 2 comprises a closed wet cooling tower main body, a plurality of wet cooling tube bundles are arranged in the closed wet cooling tower main body, and spray pipes are arranged at the top (more preferably, blades are arranged between the spray pipes and the wet cooling tube bundles, and the cooling liquid sprayed out of the spray pipes is atomized and homogenized through the blades, so that the efficiency of wet cooling is ensured, the consumption of the cooling liquid is reduced, and the cooling liquid is usually cooling water, and of course, the person skilled in the art should know that other cooling liquids can be adopted, so long as the cooling liquid is suitable for the safety and other requirements of the polysilicon production process and is within the protection scope of the invention);
the air cooling circulation water inlet pipe and the closed air cooling tower main body are connected in series to form a first closed loop to form an air cooling circulation cooling system;
the wet cooling circulation water inlet pipe and the closed wet cooling tower main body are connected in series to form a second closed loop to form a wet cooling circulation cooling system;
after the first closed loop and the second closed loop are connected in parallel, the first closed loop and the second closed loop are connected in series with the circulating water pump 3 and a plurality of parallel whole-plant heat exchange devices to form a fully-closed circulating water cooling loop for producing polysilicon; the constant-pressure water supplementing device is connected between the first closed loop and the second closed loop which are connected in parallel and the circulating water pump, so that the system is stabilized, the complete closed-loop circulation of the internal circulating water is realized, the lift of the circulating pump can be increased by 30 meters from 55 meters, the shaft power of the water pump is reduced, and the electric energy is saved by 45 percent compared with the prior technical scheme.
As a preferred embodiment, the constant pressure water supplementing device comprises a constant pressure water supplementing tank 61 and a constant pressure water supplementing pump 62, a fourth valve 63 is arranged in series between the constant pressure water supplementing tank 61 and the constant pressure water supplementing pump 62, and a fifth valve 64 and a sixth valve 65 are arranged between the constant pressure water supplementing pump 62 and an inlet of the circulating water pump.
As a preferred embodiment, a first valve 11 is provided in the first closed circuit.
As a preferred embodiment, a second main valve 21 and a second branch valve 22 are provided in the second closed circuit.
In a preferred embodiment, the first closed circuit is connected in parallel with the second closed circuit, and a third valve 5 is provided in the parallel circuit.
As a preferred embodiment, a seventh valve 66 is provided between the outlet of the circulating water pump 3 and the plurality of plant heat exchange devices.
In a preferred embodiment, a plurality of parallel heat exchange devices of the whole plant are respectively connected with the main circuit of the fully-closed circulating water cooling loop through two valves.
Example two
A fully closed circulating water cooling method for polysilicon production, comprising:
the circulating water is sent into a fully-closed circulating water cooling loop;
heat of the process stream to be cooled is removed from the plurality of whole plant heat exchange devices through the circulating water, thereby raising the temperature of the circulating water (typically 10 ℃ in design);
the circulating backwater returns to a plurality of air cooling tube bundles of a closed air cooling tower of a closed circulating water cooling loop, and part of heat of the circulating backwater is taken away by air forced to flow outside the tubes of the plurality of air cooling tube bundles;
sending the circulating backwater subjected to partial heat removal treatment into a plurality of wet cooling tube bundles of a closed wet cooling tower, and removing partial heat of the circulating backwater through a water film or water mist generated by a spray pipe to cool the circulating backwater;
the water is sent into the whole plant heat exchange equipment again through the circulating water pump 3 for circulating cooling;
and detecting the water pressure in the totally-closed circulating water cooling loop, comparing the water pressure value with a constant pressure threshold value, and starting the constant pressure water supplementing device to conduct water pressure compensation when the difference between the water pressure value and the constant pressure threshold value exceeds 20%.
Example III
The utility model provides an application of a full-closed circulating water cooling device in polysilicon production.
The beneficial effects of the embodiment include:
(1) The inlet buffer pool of the internal circulating water pump is canceled, a constant-pressure water supplementing device is added to stabilize the pressure of the system, so that complete closed-loop circulation of the internal circulating water is realized, the lift of the circulating pump can be increased by 30 meters from 55 meters, the shaft power of the water pump is reduced, and electric energy is saved by 45% compared with the original technical scheme;
(2) The arrangement mode of the air cooler adopts vertical arrangement, on one hand, the transverse natural ventilation and the air cooling tube bundles can be utilized to carry out heat exchange, the running frequency and the number of the air cooling variable frequency fans are reduced, the arrangement mode can shorten the operation time of the wet cooling tube bundles and spray water to be longer than 720 hours under the condition of the same air temperature, the water is saved by 10 percent, the electric energy is saved by 30 percent compared with other arrangement modes, and the effect and the efficiency of circulating water cooling are obviously improved; on the other hand, the air cooler is arranged in a vertical mode, accumulated water in a single tube bundle can be completely drained when the heat load is reduced in production, and the problem of tube bundle frost cracking during low-temperature operation of the air cooler in winter is effectively solved.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A full-closed circulating water cooling device for polysilicon production, comprising:
the closed air cooling tower (1), wherein the closed air cooling tower (1) comprises a closed air cooling tower main body, a plurality of air cooling tube bundles are arranged in the closed air cooling tower main body, and the air cooling tube bundles are arranged vertically;
the closed wet cooling tower (2), wherein the closed wet cooling tower (2) comprises a closed wet cooling tower main body, a plurality of wet cooling tube bundles are arranged in the closed wet cooling tower main body, and a spray pipe is arranged at the top of the closed wet cooling tower main body;
the air cooling circulation water inlet pipe and the closed air cooling tower main body are connected in series to form a first closed loop to form an air cooling circulation cooling system;
the wet cooling circulation water inlet pipe and the closed wet cooling tower main body are connected in series to form a second closed loop to form a wet cooling circulation cooling system;
after the first closed loop and the second closed loop are connected in parallel, the first closed loop and the second closed loop are connected in series with a circulating water pump (3) and a plurality of parallel whole-plant heat exchange devices to form a fully closed circulating water cooling loop for producing polysilicon; the first closed loop and the second closed loop are connected in parallel, and then a constant-pressure water supplementing device is connected between the first closed loop and the circulating water pump.
2. The fully-closed circulating water cooling device for polysilicon production according to claim 1, wherein the constant-pressure water supplementing device comprises a constant-pressure water supplementing tank (61) and a constant-pressure water supplementing pump (62), a fourth valve (63) is arranged in series between the constant-pressure water supplementing tank (61) and the constant-pressure water supplementing pump (62), and a fifth valve (64) and a sixth valve (65) are arranged between the constant-pressure water supplementing pump (62) and an inlet of the circulating water pump.
3. The fully-closed circulating water cooling apparatus for polysilicon production of claim 1, wherein the air cooling tube bundle is provided with a first vane above, improving air flow rate and cooling efficiency.
4. The fully-closed circulating water cooling device for producing polysilicon according to claim 1, wherein a second blade is arranged between the spray pipe and the wet cooling pipe bundle, and the cooling liquid sprayed out of the spray pipe is atomized and homogenized through the second blade, so that the consumption of the cooling liquid is reduced while the wet cooling efficiency is ensured.
5. The fully closed circulating water cooling apparatus for polycrystalline silicon production of claim 4, wherein the cooling liquid is cooling water.
6. A fully closed circulating water cooling apparatus for polysilicon production according to claim 1, wherein a first valve (11) is provided in the first closed circuit; a second trunk valve (21) and a second branch valve (22) are arranged in the second closed loop; the first closed loop and the second closed loop are connected in parallel, and then a third valve (5) is arranged in the parallel loop.
7. A fully closed circulating water cooling apparatus for polysilicon production according to claim 1, wherein a seventh valve (66) is provided between the outlet of the circulating water pump (3) and the plurality of plant heat exchange devices.
8. The totally closed circulating water cooling apparatus for polycrystalline silicon production according to claim 1, wherein a plurality of parallel heat exchange devices of the whole plant are connected with the main circuit of the totally closed circulating water cooling circuit through two valves respectively.
9. A totally closed circulating water cooling method for polysilicon production, realized based on the device of any one of claims 1-8, characterized by comprising:
the circulating water is sent into a fully-closed circulating water cooling loop;
heat of the process stream to be cooled is removed from the plurality of whole plant heat exchange devices through the circulating water, thereby raising the temperature of the circulating backwater;
the circulating backwater returns to a plurality of air cooling tube bundles of a closed air cooling tower of a closed circulating water cooling loop, and part of heat of the circulating backwater is taken away by air forced to flow outside the tubes of the plurality of air cooling tube bundles;
sending the circulating backwater subjected to partial heat removal treatment into a plurality of wet cooling tube bundles of a closed wet cooling tower, and removing partial heat of the circulating backwater through a water film or water mist generated by a spray pipe to cool the circulating backwater;
the water is sent into heat exchange equipment of the whole plant again through a circulating water pump (3) for circulating cooling;
and detecting the water pressure in the totally-closed circulating water cooling loop, comparing the water pressure value with a constant pressure threshold value, and starting the constant pressure water supplementing device to conduct water pressure compensation when the difference between the water pressure value and the constant pressure threshold value exceeds a certain threshold value.
10. Use of a fully closed circulating water cooling apparatus according to any one of claims 1 to 8 in the production of polycrystalline silicon.
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| CN202310329243.9A CN116294378A (en) | 2023-03-30 | 2023-03-30 | Full-closed circulating water cooling device, method and application for polysilicon production |
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| CN102636043A (en) * | 2012-04-16 | 2012-08-15 | 双良节能系统股份有限公司 | Dry and wet type united industrial circulating water cooling system |
| CN203545717U (en) * | 2013-11-14 | 2014-04-16 | 天津辰创环境工程科技有限责任公司 | Device for treating highly saline waste water with circulating water afterheat |
| US20170082370A1 (en) * | 2014-05-15 | 2017-03-23 | Frigel Firenze S.P.A. | Combined convector |
| CN105135577A (en) * | 2015-09-25 | 2015-12-09 | 大连国霖技术有限公司 | Cooling system combining natural cooling units and air-cooled water chilling units |
| CN205642068U (en) * | 2015-11-30 | 2016-10-12 | 北京朗博科科技发展有限公司 | Air cooler of multistage spray humidification |
| CN106091543A (en) * | 2016-08-17 | 2016-11-09 | 甘肃蓝科石化高新装备股份有限公司 | A kind of closed-type circulating cooling water system |
| CN206919702U (en) * | 2017-07-18 | 2018-01-23 | 福建立信换热设备制造股份公司 | A kind of integral type dry and wet combines air cooling tower |
| CN114739196A (en) * | 2022-05-13 | 2022-07-12 | 华电重工股份有限公司 | Tower type direct air cooling system |
| CN217929863U (en) * | 2022-06-14 | 2022-11-29 | 内蒙古岱海发电有限责任公司 | Dry-wet combined closed water cooling system |
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