CN114518007A - Spraying type cooling circulation heat dissipation method for pipeline wall surface - Google Patents
Spraying type cooling circulation heat dissipation method for pipeline wall surface Download PDFInfo
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- 238000001816 cooling Methods 0.000 title claims abstract description 176
- 238000000034 method Methods 0.000 title claims abstract description 62
- 230000017525 heat dissipation Effects 0.000 title claims abstract description 54
- 238000005507 spraying Methods 0.000 title claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 443
- 239000007788 liquid Substances 0.000 claims abstract description 143
- 239000007921 spray Substances 0.000 claims abstract description 40
- 230000008569 process Effects 0.000 claims abstract description 10
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C3/00—Other direct-contact heat-exchange apparatus
- F28C3/005—Other direct-contact heat-exchange apparatus one heat-exchange medium being a solid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
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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
- F25D16/00—Devices using a combination of a cooling mode associated with refrigerating machinery with a cooling mode not associated with refrigerating machinery
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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
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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- General Engineering & Computer Science (AREA)
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Abstract
The invention provides a spray type cooling circulation heat dissipation method for a pipeline wall surface, which comprises the following steps: arranging a cooling pipeline on the outer wall surface of the vacuum pipeline along the length direction of the vacuum pipeline, and placing a water collecting tank below the vacuum pipeline; when the temperature of the wall surface of the vacuum pipeline exceeds the range of the set temperature threshold value, the first power unit sends the low-temperature liquid water stored in the water storage station to the cooling pipeline, and the plurality of water spraying units of the cooling pipeline spray the low-temperature liquid water to dissipate the heat of the wall surface of the vacuum pipeline; the first water return assembly sends the high-temperature liquid water collected in the water collecting tank to the water storage station, the second power unit sends the liquid water in the water storage station to the cooling assembly for cooling, and the cooled liquid water is sent to the water storage station again; and repeating the process until the wall surface temperature of the vacuum pipeline is within the range of the set temperature threshold. By applying the technical scheme of the invention, the technical problems of huge cooling circulating water quantity on the wall surface of the vacuum pipeline and large electric energy investment in the prior art are solved.
Description
Technical Field
The invention relates to the technical field of magnetic suspension transportation, in particular to a spray type cooling circulation heat dissipation method for a pipeline wall surface.
Background
At present, a vacuum pipeline magnetic suspension transportation system is in an exploration stage, and the pipeline heat dissipation technology of the vacuum pipeline magnetic suspension transportation system has no ready experience to reference. The selection of the heat dissipation manner depends on multiple factors, such as the total heat generation amount of the device, the allowable heat amount of the device, the working environment, the installation manner and layout of the device, and the like. The main cooling modes are air cooling and liquid cooling, depending on the heat dissipation capacity, as shown in particular in fig. 2.
Air cooling is divided into natural cooling and forced cooling. The natural cooling means that under the condition that no external auxiliary energy is used, heat transfer modes such as heat conduction, convection and radiation of the equipment are utilized, and the purpose that the heating equipment radiates to the surrounding environment to achieve cooling is achieved. Generally, low-power consumption devices and components which have low requirements on temperature control and low heat flux density of equipment heating, and sealed or densely assembled devices are not suitable for (or do not need) adopting other cooling modes. Forced cooling is to use a fan or other device to make air around the heat generating equipment form forced convection so as to take away heat emitted by the equipment. This approach may be used if the space between the devices is suitable for air flow or for installation of a partial heat sink.
Direct liquid cooling means that cooling liquid is directly in close contact with heating equipment, electric equipment directly transfers dissipated heat to the cooling liquid, the cooling liquid is transferred to a shell or a heat exchanger, and finally the shell or the heat exchanger dissipates the heat. Typical cooling forms are jet impingement, spray. The jet flow impact cooling is that a fluid normal is utilized to impact the surface of equipment to form a very thin velocity layer and a very thin boundary layer, and because a single nozzle jet impact cooling can generate a large temperature gradient on a heat exchange surface, when the whole-row multi-nozzle jet flow impact cooling is adopted for reducing the gradient, the structure of the whole cooling system is complicated. Spray cooling is a cooling method in which a liquid is atomized into droplets by a nozzle and then sprayed to impinge on a heat exchange surface. The liquid drops atomized by the nozzle form a thin liquid film on the surface of the heat source, the liquid drops generate certain disturbance on the liquid film to generate a vaporization core in the liquid film, and the heat on the surface of the heat source is taken away by means of the convection evaporation of the liquid film and the phase change process of bubbles in the liquid film. Its advantages are high uniformity of temp in space, high heat exchange efficiency, and easy blocking and corrosion of nozzle.
Indirect liquid cooling, in which the cooling liquid is not in direct contact with the device, is used to mount the electrical device on a cold plate that is cooled by the liquid. The heat is transferred from the equipment to the cold plate by heat conduction, convection or radiation, and then transferred to the cooling liquid by the cold plate, and the heat is taken away by the cooling liquid. Typical forms of cooling are pump driven liquid circulation, heat pipes. The pump driving liquid circulation means that a cooling liquid flowing pipeline or a heat exchange plate is arranged on the surface of a heat source, cooling liquid in a cold plate flows through the surface of the heat source to absorb heat released by the heat source, and heat transfer is realized in a circulating flowing mode. A heat pipe is a heat transfer device that uses the phase change of a working fluid to achieve heat transfer. The evaporation section of the heat pipe is attached to the surface of heating equipment, the working liquid in the pipe core is heated and evaporated and takes away heat, the heat is latent heat of evaporation of the working liquid, steam flows to the condensation section of the heat pipe from the central channel and condenses into liquid, and latent heat is released at the same time, and the liquid flows back to the evaporation section under the action of capillary force. In this way, a closed cycle is completed, thereby transferring a large amount of heat from the heating section to the heat dissipation section. Its advantages are small space, no need of additional power consumption, and high heat flux. However, the maximum heat transfer capacity of a single loop heat pipe is usually 1kW, if the heat dissipation requirement of high power needs to be met, a plurality of heat pipes need to be connected in parallel, the pipeline arrangement form is complex, and the heat transfer capacity is limited by the transmission distance and is not suitable for heat dissipation of remote equipment. Secondly, the theoretical temperature control level of the commonly used ammonia working medium loop heat pipe is 30-50 ℃, but because of the existence of the contact thermal resistance between the evaporator and the heating surface, the temperature of the heating surface is usually as high as 70-80 ℃, and the actual temperature control level is influenced. Meanwhile, the cost of the loop heat pipe is high, the price of a single loop heat pipe is different from thousands of yuan to ten thousand yuan, the price of the aerospace-level loop heat pipe is about tens of thousands of yuan, and the economic cost is increased. The heat pipe scheme can be used for heat dissipation of small-scale, low-power electrical equipment.
Aiming at a vacuum pipeline magnetic suspension transportation system, the heat productivity of a metal pipe wall magnetic vortex is large, and the heat dissipation requirement can not be met only by the natural convection of air in the external environment, so that an active refrigeration measure must be taken. Because the pipeline diameter is big, the pipeline is long, and moves along with the train in the operation process, and the position that generates heat constantly changes, if adopt pump drive liquid circulation mode cooling, need lay the cooling cycle pipeline of thousands of kilometers grades, the cooling cycle water yield is huge, and the electric energy input is big.
Disclosure of Invention
The invention provides a spraying type cooling circulation heat dissipation method for a pipeline wall surface, which can solve the technical problems of huge cooling circulation water quantity and large electric energy investment of the vacuum pipeline wall surface in the prior art.
The invention provides a pipeline wall surface spray type cooling circulation heat dissipation method, which is used for dissipating heat of a vacuum pipeline wall surface of a vacuum pipeline magnetic suspension transportation system, and comprises the following steps: arranging a cooling pipeline on the outer wall surface of the vacuum pipeline along the length direction of the vacuum pipeline, and placing a water collecting tank below the vacuum pipeline, wherein the cooling pipeline comprises a pipeline body and a plurality of water spraying units which are arranged on the pipeline body at intervals; connecting a water storage station with a cooling pipeline through a first power unit, connecting a water collecting tank with the water storage station through a first water return assembly, and connecting the water storage station with a cooling assembly through a second power unit; when the temperature of the wall surface of the vacuum pipeline exceeds the range of a set temperature threshold value, the first power unit sends low-temperature liquid water stored in the water storage station to the cooling pipeline, a plurality of water spraying units of the cooling pipeline spray the low-temperature liquid water to dissipate the heat of the wall surface of the vacuum pipeline, part of the low-temperature liquid water is in contact with the wall surface of the vacuum pipeline and then undergoes phase change evaporation to the atmospheric environment, and the rest of the low-temperature liquid water absorbs the heat of the wall surface of the vacuum pipeline and then is collected to the water collecting tank; the first water return component sends the high-temperature liquid water collected in the water collecting tank to the water storage station, the second power unit sends the liquid water in the water storage station to the cooling component for cooling, and the cooled liquid water is sent to the water storage station again; and repeating the process until the wall surface temperature of the vacuum pipeline is within the range of the set temperature threshold.
Further, the pipeline wall surface spray type cooling circulation heat dissipation method further comprises the following steps: the inlet of the cooling pipeline is provided with a first temperature sensor and a pressure sensor, and the opening degree of the first flow regulating valve is regulated according to the temperature of the liquid water in the cooling pipeline acquired by the first temperature sensor and the pressure of the liquid water in the cooling pipeline acquired by the pressure sensor so as to ensure that the pressure and the flow of the liquid water in the cooling pipeline meet the opening pressure of the water spraying unit.
Further, the pipeline wall surface spray type cooling circulation heat dissipation method further comprises the following steps: a first filter is arranged between the first power unit and the first flow regulating valve and used for filtering liquid water output by the water storage station.
Further, the pipeline wall surface spray type cooling circulation heat dissipation method further comprises the following steps: a second temperature sensor is arranged in the water storage tank and used for monitoring the temperature of liquid water in the water storage tank; the first water return assembly comprises a third power unit and a second flow regulating valve, the water collecting tank, the third power unit, the second flow regulating valve and the water storage station are sequentially connected, when the temperature of the wall surface of the vacuum pipeline exceeds a set temperature threshold range, the third power unit conveys the liquid water in the water collecting tank to the water storage station, and the spraying type cooling circulation heat dissipation method of the wall surface of the pipeline adjusts the opening degree of the second flow regulating valve according to the temperature of the liquid water in the water storage tank obtained by the second temperature sensor so as to adjust the water quantity of the liquid water entering the water storage tank.
Further, the pipeline wall surface spray type cooling circulation heat dissipation method further comprises the following steps: and a second filter is arranged between the third power unit and the second flow regulating valve and is used for filtering liquid water output by the water collecting tank.
Further, the pipeline wall surface spray type cooling circulation heat dissipation method further comprises the following steps: a second water return assembly is arranged between the water collecting tank and the water storage station, the second water return assembly comprises a fourth power unit and a third flow regulating valve, the second water return assembly and the first water return assembly are arranged in parallel, and the water collecting tank, the fourth power unit, the third flow regulating valve and the water storage station are sequentially connected; when the temperature of the wall surface of the vacuum pipeline exceeds the range of the set temperature threshold value, the fourth power unit conveys the liquid water in the water collecting tank to the water storage station, and the spray type cooling circulation heat dissipation method of the wall surface of the pipeline adjusts the opening degree of the third flow adjusting valve according to the temperature of the liquid water in the water storage tank acquired by the second temperature sensor so as to adjust the water quantity of the liquid water entering the water storage tank.
Further, the pipeline wall surface spray type cooling circulation heat dissipation method further comprises the following steps: and a third filter is arranged between the fourth power unit and the third flow regulating valve and is used for filtering liquid water discharged by the water collecting tank.
Further, the pipeline wall surface spray type cooling circulation heat dissipation method further comprises the following steps: the water level sensor is arranged in the water storage tank and used for monitoring the water level in the water storage tank, the water storage tank is provided with a supply port, the supply port is used for supplying liquid water to the water storage tank, and the opening of the supply port is adjusted according to the water level in the water storage tank and the temperature of the liquid water in the water storage tank by the pipeline wall surface spray type cooling circulation heat dissipation method.
Further, the cooling assembly specifically cools the liquid water in the water storage station includes: liquid water in a water tank of the cooling assembly is ejected from the nozzle in a pulse mode under the action of the regulator; the water drops sprayed out of the nozzle impact one side with the heat exchange fins to form a water drop film; the heat carried by the liquid water in the water storage station is transferred to the water drop film, and the water drop film is vaporized and flashed into liquid steam and discharged to the atmosphere.
Further, the first power unit comprises a water feeding pump, and the second power unit comprises a cooling pump.
The technical scheme of the invention is applied, a spray cooling circulation heat dissipation method of the pipeline wall surface is provided, the heat dissipation method adopts a spray cooling system to utilize a low-cost cooling working medium, namely tap water, when the temperature of the pipeline wall surface of a vacuum pipeline exceeds a set temperature range, the wall surface of the vacuum pipeline is dissipated by opening a plurality of water spraying units, liquid water after heat absorption is collected by a water collecting tank, the liquid water after heat absorption is sent back to a water storage station again by a first water return assembly and is cooled by a cooling assembly, the process is repeated until the temperature of the wall surface of the vacuum pipeline is within a set temperature threshold range, the method can solve the problem of pipeline wall surface heat dissipation caused by aerodynamic heat and metal pipeline wall vortex magnetic induction heating of a magnetic suspension transportation system of the vacuum pipeline with ultra-long distance and ultra-large pipeline diameter, has high cooling efficiency and can realize the circulation of the liquid water, effectively save the water yield, reduce the electric energy input, satisfy powerful heat dissipation demand.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic structural diagram of a heat dissipation system used in a method for dissipating heat by a pipeline wall-spray cooling cycle according to an embodiment of the present invention;
fig. 2 shows a schematic block diagram summarizing the cooling method provided in the prior art.
Wherein the figures include the following reference numerals:
10. a cooling pipeline; 11. a pipeline body; 12. a water spray unit; 20. a water storage station; 20a, a supply port; 30. a first power unit; 40. a water collection tank; 50. a first water return assembly; 51. a third power unit; 52. a second flow regulating valve; 53. a second filter; 60. a second power unit; 70. a cooling assembly; 80. a first temperature sensor; 90. a pressure sensor; 100. a first flow regulating valve; 110. a first filter; 120. a second temperature sensor; 130. a second water return assembly; 131. a fourth power unit; 132. a third flow rate regulating valve; 133. a third filter; 140. a first solenoid valve; 150. a second solenoid valve; 160. and a third solenoid valve.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
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 example embodiments according to the present application. 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.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
As shown in fig. 1, according to an embodiment of the present invention, there is provided a method for dissipating heat from a vacuum pipeline wall of a vacuum pipeline magnetic levitation transportation system by using a pipeline wall spray cooling cycle, the method comprising: arranging a cooling pipeline 10 on the outer wall surface of the vacuum pipeline along the length direction of the vacuum pipeline, and placing a water collecting tank 40 below the vacuum pipeline, wherein the cooling pipeline 10 comprises a pipeline body 11 and a plurality of water spraying units 12, and the plurality of water spraying units 12 are arranged on the pipeline body 11 at intervals; connecting the water storage station 20 with the cooling pipeline 10 through a first power unit 30, connecting the water collecting tank 40 with the water storage station 20 through a first water return assembly 50, and connecting the water storage station 20 with the cooling assembly 70 through a second power unit 60; when the temperature of the wall surface of the vacuum pipeline exceeds the range of the set temperature threshold value, the first power unit 30 sends the low-temperature liquid water stored in the water storage station 20 to the cooling pipeline 10, the plurality of water spraying units 12 of the cooling pipeline 10 spray the low-temperature liquid water to dissipate the heat of the wall surface of the vacuum pipeline, part of the low-temperature liquid water is in contact with the wall surface of the vacuum pipeline and then undergoes phase change evaporation to the atmospheric environment, and the rest low-temperature liquid water absorbs the heat of the wall surface of the vacuum pipeline and then is collected to the water collecting tank 40; the first water returning component 50 sends the high-temperature liquid water collected in the water collecting tank 40 to the water storage station 20, the second power unit 60 sends the liquid water in the water storage station 20 to the cooling component 70 for cooling, and sends the cooled liquid water to the water storage station 20 again; and repeating the process until the wall surface temperature of the vacuum pipeline is within the range of the set temperature threshold.
By applying the configuration mode, the spray type cooling circulation heat dissipation method for the pipeline wall surface is provided, the spray type cooling method is adopted, a low-cost cooling working medium, namely tap water is utilized, when the temperature of the pipeline wall surface of the vacuum pipeline exceeds a set temperature range, the wall surface of the vacuum pipeline is cooled by opening a plurality of water spraying units, the liquid water after heat absorption is collected by a water collecting tank, the liquid water after heat absorption is sent back to a water storage station by a first water return assembly and is cooled by a cooling assembly, the process is repeated until the temperature of the wall surface of the vacuum pipeline is within a set temperature threshold value range, the mode can solve the problem of pipeline wall surface heat dissipation caused by aerodynamic heat and metal pipeline wall magnetic vortex induction heating of a vacuum pipeline magnetic suspension transportation system with ultra-long distance and ultra-large pipeline diameter, the cooling efficiency is high, and the circulation of the liquid water can be realized, effectively save the water yield, reduce the electric energy input, satisfy powerful heat dissipation demand.
Further, in the present invention, in order to smoothly turn on the water spraying unit when the temperature of the wall surface of the vacuum pipe exceeds the set temperature threshold range, the method for heat dissipation by pipe wall surface spray cooling circulation may further include: the first temperature sensor 80 and the pressure sensor 90 are arranged at the inlet of the cooling pipeline 10, and the opening degree of the first flow regulating valve 100 is regulated according to the temperature of the liquid water in the cooling pipeline 10 acquired by the first temperature sensor 80 and the pressure of the liquid water in the cooling pipeline 10 acquired by the pressure sensor 90 so as to ensure that the pressure and the flow of the liquid water in the cooling pipeline 10 meet the opening pressure of the water spraying unit 12.
Under the configuration mode, when the wall surface temperature of the vacuum pipeline exceeds the range of the set temperature threshold value, the opening degree of the first flow regulating valve is regulated by acquiring the temperature and the pressure of the cooling pipeline in real time, so that the pressure and the flow of liquid water in the cooling pipeline can be ensured to meet the opening pressure of the water spraying unit. In addition, through the temperature of acquiring the interior liquid water of cooling pipeline in real time, when the temperature of liquid water surpassed the settlement temperature threshold value, can control cooling module and cool down the liquid water in the water storage station to the realization is to the heat dissipation of vacuum pipe wall.
Further, in the present invention, since dust, impurities, etc. are easily accumulated in the water storage station, in order to avoid blocking the nozzles by the impurities in the water, hindering the formation of droplets, and affecting the subsequent cooling effect, the method for dissipating heat by spraying cooling circulation on the wall surface of the pipeline may be configured to further include: a first filter 110 is disposed between the first power unit 30 and the first flow rate adjustment valve 100, and the first filter 110 is used for filtering the liquid water output from the water storage station 20. Under the configuration mode, dust, sundries and the like accumulated in the water storage station are filtered through the first filter, and the water quality can be guaranteed to meet the requirement of subsequent cooling and recycling.
In addition, in the invention, in order to effectively cool the wall surface of the vacuum pipeline, it is necessary to ensure that the temperature of the liquid water in the water storage station is in a lower temperature range, and therefore, the temperature in the water storage station needs to be monitored in real time to prevent the liquid water, which is introduced by the first water returning assembly and absorbs too much heat, from entering the water storage station. Specifically, the pipeline wall surface spray type cooling circulation heat dissipation method further comprises the following steps: a second temperature sensor 120 is arranged in the water storage station, and the second temperature sensor 120 is used for monitoring the temperature of liquid water in the water storage tank; the first water return assembly 50 comprises a third power unit 51 and a second flow regulating valve 52, the water collecting tank 40, the third power unit 51, the second flow regulating valve 52 and the water storage station 20 are sequentially connected, when the temperature of the wall surface of the vacuum pipeline exceeds a set temperature threshold range, the third power unit 51 conveys the liquid water in the water collecting tank 40 to the water storage station 20, and the pipeline wall surface spraying type cooling circulation heat dissipation method adjusts the opening degree of the second flow regulating valve 52 according to the temperature of the liquid water in the water storage tank obtained by the second temperature sensor 120 so as to regulate the water quantity of the liquid water entering the water storage tank.
Further, in the present invention, since dust, impurities, etc. are easily accumulated in the water collection tank, in order to avoid blocking the nozzles by impurities in water, hindering the formation of droplets, and affecting the subsequent cooling effect, the method for dissipating heat by spraying cooling circulation on the wall surface of the pipeline may be configured to further include: a second filter 53 is disposed between the third power unit 51 and the second flow rate adjustment valve 52, and the second filter 53 is used for filtering the liquid water output from the water collection tank 40. Under the configuration mode, dust, impurities and the like accumulated in the water collecting tank are filtered through the second filter, and the water quality can be ensured to meet the requirement of subsequent cooling and recycling.
In the present invention, in order to further improve the cooling efficiency and the recovery efficiency, the method for dissipating heat by a pipe wall spray cooling cycle may further include: a second water return assembly 130 is arranged between the water collecting tank 40 and the water storage station 20, the second water return assembly 130 comprises a fourth power unit 131 and a third flow regulating valve 132, the second water return assembly 130 and the first water return assembly 50 are arranged in parallel, and the water collecting tank 40, the fourth power unit 131, the third flow regulating valve 132 and the water storage station 20 are sequentially connected; when the temperature of the wall surface of the vacuum pipeline exceeds the set temperature threshold range, the fourth power unit 131 transports the liquid water in the water collecting tank 40 to the water storage station 20, and the pipeline wall surface spray type cooling circulation heat dissipation method adjusts the opening degree of the third flow regulating valve 132 according to the temperature of the liquid water in the water storage tank acquired by the second temperature sensor 120 to regulate the water amount of the liquid water entering the water storage tank.
Under the configuration mode, after the plurality of water spraying units spray liquid water to dissipate heat of the wall surface of the vacuum pipeline, the water collecting tank collects the liquid water after heat absorption, the first water returning component and the second water returning component jointly convey the liquid water in the water collecting tank to the water storage station, the liquid water is cooled in the water storage station through the action of the cooling component, and the first power unit sends the cooled liquid water to the cooling pipeline again to cool the wall surface of the vacuum pipeline.
Further, in the present invention, since dust, impurities, etc. are easily accumulated in the water collection tank, in order to avoid blocking the nozzles by impurities in water, hindering the formation of droplets, and affecting the subsequent cooling effect, the method for dissipating heat by spraying cooling circulation on the wall surface of the pipeline may be configured to further include: a third filter 133 is disposed between the fourth power unit 131 and the third flow rate adjustment valve 132, and the third filter 133 is used to filter liquid water discharged from the water collection sump 40. In such a configuration mode, dust, impurities and the like accumulated in the water collecting tank are filtered through the third filter, so that the water quality can be ensured to meet the requirement of subsequent cooling and recycling.
In addition, in the invention, in the process of cooling the wall surface of the vacuum pipeline, a part of liquid water is contacted with the high-temperature wall surface and then undergoes phase change to be dispersed in the atmospheric environment in the form of water vapor, and in order to prevent the insufficient water in the water storage station caused by continuous evaporation of the liquid water from affecting the heat dissipation of the wall surface of the vacuum pipeline, the method for heat dissipation of the spray cooling cycle of the wall surface of the pipeline can be configured to further comprise: the water level sensor is arranged in the water storage tank, the water level sensor is used for monitoring the water level in the water storage tank, the water storage tank is provided with a supply port 20a, the supply port 20a is used for supplying liquid water to the water storage tank, and the opening degree of the supply port 20a is adjusted according to the water level in the water storage tank and the temperature of the liquid water in the water storage tank by the pipeline wall surface spray type cooling circulation heat dissipation method.
Under the configuration mode, when the water level sensor senses that the water level in the water storage station is lower than a set value or the temperature of liquid water in the water storage station exceeds a set temperature threshold value, the opening degree of the replenishment port is increased, so that the replenishment rate of the liquid water can be increased, a sufficient amount of liquid water is ensured to enter the water storage station, the temperature of the liquid water in the water storage station is reduced, and the wall surface of the vacuum pipeline is radiated by the liquid water; when the water level sensor senses that the water level in the water storage station is higher than a set value, the opening degree of the supply port can be reduced, so that the supply rate of liquid water can be reduced, and the overflow of the liquid water in the water storage tank caused by the excessively high supply rate of the liquid water is prevented.
Further, as an embodiment of the present invention, in order to cool the cooling medium, a circulating water cooling method may be used to cool the cooling medium. The cooling module 70 is specifically configured to cool the liquid water in the water storage station 20, and includes: the liquid water in the water tank of the cooling assembly 70 is ejected from the nozzle in a pulse mode under the action of the regulator; the water drops sprayed out of the nozzle impact one side with the heat exchange fins to form a water drop film; the heat carried by the liquid water in the storage station 20 is transferred to the water droplet film, which vaporizes and flashes into liquid vapor and vents to the atmosphere.
Alternatively, as another embodiment of the present invention, forced air cooling may be used to cool the cooling medium. Specifically, the cooling device comprises an air cooling unit for cooling the cooling medium. The air-cooling unit may include a fan or the like which generates forced convection of air around the cooling medium to remove heat emitted from the cooling medium. In addition, a refrigeration system in a high-speed rail or an air conditioner can also be used as the cooling device, and is not limited herein.
Further, in the present invention, the first power unit 30 includes a water feed pump, and the second power unit 60 includes a cooling pump.
In order to further understand the present invention, a detailed description of the method and system for cooling and circulating heat dissipation by spraying on the wall of a pipe provided by the present invention is provided below with reference to fig. 1.
As shown in fig. 1, according to an embodiment of the present invention, there is provided a system for performing wall heat dissipation of a vacuum pipe by using a pipe wall spray cooling circulation heat dissipation method, the system including a cooling pipe 10, a water storage station 20, a first power unit 30, a water collection tank 40, a first water return assembly 50, a second power unit 60, a cooling assembly 70, a first temperature sensor 80, a pressure sensor 90, a first flow rate adjustment valve 100, a first filter 110, a second temperature sensor 120, a second water return assembly 130, a first solenoid valve 140, a second solenoid valve 150, a third solenoid valve 160, and a water level sensor, wherein the cooling pipe 10 is disposed on an outer wall surface of the vacuum pipe along a length direction of the vacuum pipe, the cooling pipe 10 includes a pipe body 11 and a plurality of water spray units 12, the plurality of water spray units 12 are disposed on the pipe body 11 at intervals, the water storage station 20, the first power unit 30, the first filter 110, the first flow regulating valve 100 and the first electromagnetic valve 140 are sequentially connected with the cooling pipeline 10, the first temperature sensor 80 and the pressure sensor 90 are arranged at an inlet of the cooling pipeline 10, the first temperature sensor 80 is used for monitoring the temperature of the cooling pipeline 10, the pressure sensor 90 is used for monitoring the pressure of the cooling pipeline 10, and the pipeline wall surface spray type cooling circulation heat dissipation system can regulate the opening degree of the first flow regulating valve 100 according to the temperature of the liquid water in the cooling pipeline 10 acquired by the first temperature sensor 80 and the pressure of the liquid water in the cooling pipeline 10 acquired by the pressure sensor 90 so as to ensure that the pressure and the flow of the liquid water in the cooling pipeline 10 meet the opening pressure of the water spray unit 12. In the present embodiment, a water feed pump may be used as the first power unit 30, and a cooling pump may be used as the second power unit 60.
The second water return assembly 130 and the first water return assembly 50 are arranged between the water collection tank 40 and the water storage station 20 in parallel, the first water return assembly 50 comprises a third power unit 51, a second flow regulating valve 52 and a second filter 53, and the water collection tank 40, the third power unit 51, the second filter 53, the second flow regulating valve 52, the second electromagnetic valve 150 and the water storage station 20 are connected in sequence. The second water return assembly 130 comprises a fourth power unit 131, a third flow regulating valve 132 and a third filter 133, and the water collecting tank 40, the fourth power unit 131, the third filter 133, the third flow regulating valve 132, a third solenoid valve 160 and the water storage station 20 are connected in sequence. In this embodiment, a return pump may be employed as the third power unit 51, and a return pump may be employed as the fourth power unit 131.
The spray type cooling circulation heat dissipation system for the pipeline wall surface provided by the invention specifically comprises the following steps when the wall surface of the vacuum pipeline is subjected to heat dissipation.
Step one, arranging a cooling pipeline 10 on the outer wall surface of a vacuum pipeline along the length direction of the vacuum pipeline, placing a water collecting tank 40 below the vacuum pipeline, wherein the cooling pipeline 10 comprises a pipeline body 11 and a plurality of water spraying units 12, and the plurality of water spraying units 12 are arranged on the pipeline body 11 at intervals; the water storage station 20 is connected with the cooling pipeline 10 through the first power unit 30, the water collecting tank 40 is connected with the water storage station 20 through the first water return assembly 50, and the water storage station 20 is connected with the cooling assembly 70 through the second power unit 60. A first temperature sensor 80 and a pressure sensor 90 are arranged at the inlet of the cooling pipeline 10, a first filter 110 is arranged between the first power unit 30 and the first flow regulating valve 100, a second temperature sensor 120 is arranged in the water storage tank, the first water return assembly 50 comprises a third power unit 51 and a second flow regulating valve 52, a second filter 53 is arranged between the third power unit 51 and the second flow regulating valve 52, a second water return assembly 130 is arranged between the water collecting tank 40 and the water storage station 20, the second water return assembly 130 comprises a fourth power unit 131 and a third flow regulating valve 132, a third filter 133 is arranged between the fourth power unit 131 and the third flow regulating valve 132, and a water level sensor is arranged in the water storage tank.
And step two, monitoring the wall surface temperature of the vacuum pipeline in real time, and when the pipeline wall surface temperature of the vacuum pipeline exceeds the range of the set temperature threshold value, pumping the low-temperature liquid water which is stored in the water storage station 20 along the vacuum pipeline and cooled by the cooling assembly to the first filter 110 by the first power unit 30 installed along the vacuum pipeline.
And step three, the first filter 110 finely filters the cooled water to prevent impurities in the water from blocking the water spraying unit and preventing fog drops from forming to influence the subsequent cooling effect.
And step four, monitoring the water temperature through the first temperature sensor 80 at the inlet of the cooling pipeline and monitoring the pressure through the pressure sensor 90, and adjusting the first flow regulating valve 100 according to the water temperature and the water pressure at the inlet of the cooling pipeline, so that the pressure and the flow of the cooling water in the cooling pipeline meet the opening pressure of the water spraying unit.
And step five, opening the first electromagnetic valve 140, enabling the cooling liquid water to enter a flow channel above the cooling pipeline, automatically opening the water spraying unit to spray the cooling liquid water on the surface of the wall of the high-temperature pipeline in a water droplet form, enabling part of the water droplets to be in contact with the high-temperature wall surface and then to undergo phase change, dispersing the phase change in the atmospheric environment in a steam form, collecting the rest water droplets to water collecting grooves on two sides of the pipeline along the wall of the pipeline to form local heat convection, and realizing the transfer of heat from the wall of the pipeline to the cooling water mainly through the two modes.
And step six, the wastewater collected in the water collecting tank 40 is pumped to the second filter 53 and the third filter 133 by the third power unit 51 and the fourth power unit 131, respectively. The second filter 53 and the third filter 133 filter dust, impurities and the like accumulated in the water collecting tank 40, so that the water quality can meet the requirement of subsequent cooling recycling.
And step seven, monitoring the water temperature in the water storage station 20 through the second temperature sensor 120, opening the second electromagnetic valve and the third electromagnetic valve, and adjusting the water amount and the water temperature entering the water storage station 20 through adjusting the opening degrees of the second flow regulating valve 52, the third flow regulating valve 132 and the supply port. The water level sensor monitors the water level in the water storage station 20, when the water level sensor senses that the water level in the water storage station is lower than a set value or the temperature of liquid water in the water storage station exceeds a set temperature threshold value, the opening of the supply port is increased, so that the supply rate of the liquid water can be increased, a sufficient amount of liquid water is ensured to enter the water storage station, and the wall surface of the vacuum pipeline is radiated by the liquid water; when the water level sensor senses that the water level in the water storage station is higher than a set value, the opening degree of the supply port can be reduced, so that the supply rate of liquid water can be reduced, and the overflow of the liquid water in the water storage tank caused by the excessively high supply rate of the liquid water is prevented.
And step eight, starting the second power unit 60, and cooling the heated cooling water in the water storage station 20 through the built-in cooling component to ensure that the water temperature meets the inlet temperature requirement of the cooling pipeline. And repeating the steps to realize the heat dissipation circulation of the wall surface of the pipeline.
In summary, the invention provides a spray cooling circulation heat dissipation method for the wall surface of a pipeline, which utilizes a low-cost cooling working medium, namely tap water, when the temperature of the wall surface of the vacuum pipeline exceeds a set temperature range, opens a plurality of water spray units to dissipate heat of the wall surface of the vacuum pipeline, collects liquid water after heat absorption through a water collection tank, sends the liquid water after heat absorption back to a water storage station through a first water return assembly and is cooled by a cooling assembly, and repeats the process until the temperature of the wall surface of the vacuum pipeline is within a set temperature threshold range, so that the problem of heat dissipation of the wall surface of the pipeline caused by aerodynamic heat and magnetic vortex induction heating of a metal pipe wall in a magnetic suspension transportation system for the vacuum pipeline with an ultra-long distance and an ultra-large pipe diameter can be solved, the cooling efficiency is high, the circulation of the liquid water can be realized, and the water quantity can be effectively saved, the electric energy input is reduced, and the high-power heat dissipation requirement is met.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …", "above … …", "above … …", "above", and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
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 pipeline wall surface spraying type cooling circulation heat dissipation method is characterized by being used for dissipating heat of the vacuum pipeline wall surface of a vacuum pipeline magnetic suspension transportation system, and comprises the following steps:
arranging a cooling pipeline (10) on the outer wall surface of the vacuum pipeline along the length direction of the vacuum pipeline, and placing a water collecting tank (40) below the vacuum pipeline, wherein the cooling pipeline (10) comprises a pipeline body (11) and a plurality of water spraying units (12), and the plurality of water spraying units (12) are arranged on the pipeline body (11) at intervals;
connecting a water storage station (20) with the cooling pipeline (10) through a first power unit (30), connecting the water collecting tank (40) with the water storage station (20) through a first water return assembly (50), and connecting the water storage station (20) with a cooling assembly (70) through a second power unit (60);
when the temperature of the wall surface of the vacuum pipeline exceeds the range of a set temperature threshold value, the first power unit (30) sends low-temperature liquid water stored in the water storage station (20) to the cooling pipeline (10), a plurality of water spraying units (12) of the cooling pipeline (10) spray the low-temperature liquid water to dissipate the wall surface of the vacuum pipeline, part of the low-temperature liquid water is in contact with the wall surface of the vacuum pipeline and then undergoes phase change evaporation to the atmospheric environment, and the rest of the low-temperature liquid water absorbs the heat of the wall surface of the vacuum pipeline and then is collected to the water collecting tank (40); the first water return assembly (50) sends the high-temperature liquid water collected in the water collecting tank (40) to the water storage station (20), and the second power unit (60) sends the liquid water in the water storage station (20) to the cooling assembly (70) for cooling and sends the cooled liquid water to the water storage station (20) again; and repeating the process until the wall surface temperature of the vacuum pipeline is within the range of the set temperature threshold.
2. The method of claim 1, further comprising: the method comprises the steps that a first temperature sensor (80) and a pressure sensor (90) are arranged at an inlet of a cooling pipeline (10), and the opening degree of a first flow regulating valve (100) is regulated according to the temperature of liquid water in the cooling pipeline (10) acquired by the first temperature sensor (80) and the pressure of the liquid water in the cooling pipeline (10) acquired by the pressure sensor (90) so as to ensure that the pressure and the flow of the liquid water in the cooling pipeline (10) meet the opening pressure of a water spraying unit (12).
3. The method of claim 2, further comprising: a first filter (110) is arranged between the first power unit (30) and the first flow regulating valve (100), and the first filter (110) is used for filtering liquid water output by the water storage station (20).
4. The method of claim 1 to 3, further comprising: arranging a second temperature sensor (120) in the water storage tank, wherein the second temperature sensor (120) is used for monitoring the temperature of liquid water in the water storage tank; the first water return assembly (50) comprises a third power unit (51) and a second flow regulating valve (52), the water collecting tank (40), the third power unit (51), the second flow regulating valve (52) and the water storage station (20) are sequentially connected, when the temperature of the wall surface of the vacuum pipeline exceeds a set temperature threshold range, the third power unit (51) conveys the liquid water in the water collecting tank (40) to the water storage station (20), and the pipeline wall surface spray type cooling circulation heat dissipation method adjusts the opening degree of the second flow regulating valve (52) according to the temperature of the liquid water in the water storage tank acquired by the second temperature sensor (120) so as to adjust the water quantity of the liquid water entering the water storage tank.
5. The method of claim 4, further comprising: a second filter (53) is arranged between the third power unit (51) and the second flow regulating valve (52), and the second filter (53) is used for filtering liquid water output by the water collecting tank (40).
6. The method of claim 1 to 5, further comprising: a second water return assembly (130) is arranged between the water collecting tank (40) and the water storage station (20), the second water return assembly (130) comprises a fourth power unit (131) and a third flow regulating valve (132), the second water return assembly (130) and the first water return assembly (50) are arranged in parallel, and the water collecting tank (40), the fourth power unit (131), the third flow regulating valve (132) and the water storage station (20) are sequentially connected; when the temperature of the wall surface of the vacuum pipeline exceeds the range of the set temperature threshold value, the fourth power unit (131) conveys the liquid water in the water collecting tank (40) to the water storage station (20), and the spray type cooling circulation heat dissipation method of the wall surface of the pipeline adjusts the opening degree of the third flow regulating valve (132) according to the temperature of the liquid water in the water storage tank acquired by the second temperature sensor (120) so as to regulate the water quantity of the liquid water entering the water storage tank.
7. The method of claim 6, further comprising: a third filter (133) is arranged between the fourth power unit (131) and the third flow regulating valve (132), and the third filter (133) is used for filtering liquid water discharged from the water collecting tank (40).
8. The method of claim 4, further comprising: the pipeline wall surface spray type cooling circulation heat dissipation method comprises the steps that a water level sensor is arranged in the water storage tank and used for monitoring the water level in the water storage tank, the water storage tank is provided with a supply port (20a), the supply port (20a) is used for supplying liquid water to the water storage tank, and the opening degree of the supply port (20a) is adjusted according to the water level in the water storage tank and the temperature of the liquid water in the water storage tank.
9. The method of claim 8, wherein the cooling module (70) cools the liquid water in the water storage station (20) by:
liquid water in a water tank of the cooling assembly (70) is ejected from the nozzle in a pulse mode under the action of the regulator;
the water drops sprayed out of the nozzle impact one side with the heat exchange fins to form a water drop film;
the heat carried by the liquid water in the water storage station (20) is transferred to the water drop film, and the water drop film is vaporized and flashed into liquid steam and discharged to the atmosphere.
10. The method of claim 1 to 9, wherein the first power unit (30) comprises a water pump and the second power unit (60) comprises a cooling pump.
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| JPH02208472A (en) * | 1989-02-08 | 1990-08-20 | Mitsubishi Electric Corp | Low-temperature vessel |
| JPH03231062A (en) * | 1990-02-06 | 1991-10-15 | Takenaka Komuten Co Ltd | Cooling in vacuum tube transport system |
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