CN111006416B - In-pipe aerosol cooling system - Google Patents
In-pipe aerosol cooling system Download PDFInfo
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- CN111006416B CN111006416B CN201911166131.6A CN201911166131A CN111006416B CN 111006416 B CN111006416 B CN 111006416B CN 201911166131 A CN201911166131 A CN 201911166131A CN 111006416 B CN111006416 B CN 111006416B
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- 238000001816 cooling Methods 0.000 title claims abstract description 34
- 239000000443 aerosol Substances 0.000 title claims abstract description 32
- 239000007788 liquid Substances 0.000 claims abstract description 116
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 49
- 239000000203 mixture Substances 0.000 claims abstract description 21
- 238000000889 atomisation Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000003860 storage Methods 0.000 claims description 13
- 230000001502 supplementing effect Effects 0.000 claims description 6
- 230000005514 two-phase flow Effects 0.000 claims description 4
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 5
- 238000010521 absorption reaction Methods 0.000 abstract description 4
- 238000009827 uniform distribution Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 51
- 238000005516 engineering process Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000010079 rubber tapping Methods 0.000 description 6
- 238000005507 spraying Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000009835 boiling Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 239000000110 cooling liquid Substances 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910017112 Fe—C Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009688 liquid atomisation Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
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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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B19/00—Machines, plants or systems, using evaporation of a refrigerant but without recovery of the vapour
- F25B19/02—Machines, plants or systems, using evaporation of a refrigerant but without recovery of the vapour using fluid jet, e.g. of steam
- F25B19/04—Machines, plants or systems, using evaporation of a refrigerant but without recovery of the vapour using fluid jet, e.g. of steam using liquid jet, e.g. of water
-
- 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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/36—Coil arrangements
- H05B6/42—Cooling of coils
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Nozzles (AREA)
Abstract
The invention provides an in-pipe aerosol cooling system, which is based on the principle that high-pressure gas in a nozzle gas supply pipeline is utilized to form negative pressure at the outlet of a nozzle through the nozzle, liquid in the liquid pipeline is sucked out and atomized by utilizing siphon action, an aerosol mixture with atomized liquid drops is subjected to secondary atomization under the action of the high-pressure gas in a jet ejector pipeline, and the aerosol is accelerated, so that the aerosol has high speed, the loss of resistance along the way of a pipeline can be overcome, meanwhile, the atomizing cone angle of the nozzle can be reduced, the flow of the aerosol mixture in the pipe and the uniform distribution of the liquid drops in the mixture are facilitated; the system mainly comprises a liquid pipeline system, a nozzle air supply pipeline system, an ejector air supply pipeline system, a pressure stabilizing pipeline system, an ejector and a nozzle device. The aerosol cooling method has higher heat exchange efficiency due to the heat absorption by utilizing the phase change of the liquid drops, and meanwhile, the equipment system is simple to operate, and the content and the diameter of the liquid drops and the aerosol flow rate are easy to adjust.
Description
Technical Field
The invention belongs to the technical field of flow heat exchange, and relates to an in-pipe aerosol cooling system.
Background
At present, the flow heat exchange in a pipe can be mainly divided into single-phase flow heat exchange and two-phase flow heat exchange, wherein the single-phase flow heat exchange can be divided into single-phase gas and single-phase liquid, and for the single-phase gas flow heat exchange, the heat exchange capacity is weaker because the specific heat capacity of the gas is smaller, and in order to increase the heat exchange efficiency, the heat exchange capacity is generally improved by adding ribs, but the manufacturing cost of a pipe fitting is increased; for single-phase liquid flow heat exchange, although the heat capacity is larger, the heat exchange capacity is very high, when the wall surface temperature of the pipe fitting is larger or the heat flux density is larger, the contact of the liquid and the pipe wall can generate rapid evaporation of the liquid, steam is generated between the liquid and the pipe wall, heat exchange between the liquid and the pipe wall is blocked, the heat exchange capacity of the liquid flow is weakened, even heat transfer deterioration phenomenon can occur, and the pipe fitting is damaged. In addition, certain conditions are not suitable for cooling by using single-phase liquid, and once a pipeline leaks, the pipeline has a great potential safety hazard; for two-phase flow heat exchange, gas and liquid can be layered in the pipe, so that the heat exchange of the pipe wall is uneven, and thermal stress deformation is easy to generate. On the basis of not increasing the manufacturing cost of the heat exchange tube, the heat exchange capacity is improved as much as possible, and the heat exchange tube has become a main problem in the technical field of heat exchange flow in the tube.
Spray cooling is one of the current novel cooling modes, and is mainly a high-heat-flow forced cooling technology which is used for atomizing liquid into small liquid drops of 20-100 mu m through a nozzle by means of high-pressure gas or external power, forcedly spraying the liquid to the surface of a heated object to form a liquid film, and taking away heat through single-phase flow heat exchange and liquid drop phase change heat absorption. Compared with a single-phase forced convection heat exchange mode, the liquid atomization method expands the convection heat exchange area by atomizing the liquid into liquid drops and introduces phase change heat exchange of the liquid drops. Therefore, the heat exchanger has the advantages of good heat exchange performance, no boiling hysteresis, low system pressure, good temperature uniformity of the cooling surface, small working medium demand and the like. However, the spray cooling is limited to heat exchange in a large space or heat exchange by spraying at a certain angle to the heat exchange wall, and cannot be applied to small-caliber pipelines or pipelines with complex shapes (such as spiral pipes). For the flow heat exchange in the tube, no scholars have proposed related technical means at present, mainly because the existence of an atomization cone angle causes liquid drops to impact the inner wall of the tube, so that the liquid drops are condensed on the inner wall of the tube. How to weaken the atomizing cone angle of the nozzle and the impact of the liquid drops on the inner wall of the pipe becomes a main reason for restricting the application of spray cooling to the heat exchange of the flow in the pipe.
Disclosure of Invention
The invention aims to provide an in-pipe aerosol cooling system and method, which can improve the heat exchange efficiency of a heat exchanger, quickly reduce the temperature of a pipeline in a short time, break the limitation of the traditional spray cooling method, and have the advantages of simple installation, convenient use and operation, timely response, high heat exchange efficiency and the like.
The invention adopts the following technical proposal to realize the aim of the invention.
The invention provides an in-pipe aerosol cooling system which comprises a liquid supply system, a nozzle air supply system, an ejector air supply system, a pressure stabilizing system, a nozzle device, an ejector and a connecting sleeve; the nozzle device is a two-phase flow nozzle, is of a long cylindrical structure as a whole, comprises a bottom air supply interface and a liquid inlet interface below the side part, and is provided with threads on the periphery of the middle part; the whole jet device is of a Y-shaped structure and consists of a main pipe and a side pipe, one side of the main pipe is connected with a pipeline to be cooled, the other side of the main pipe is internally connected with a straight pipe with the caliber smaller than that of the main pipe, one side of the straight pipe is inserted into the main pipe of the jet device and is connected with the main pipe of the jet device through threads, and the other side of the straight pipe is connected with a jet device air supply system; threads are arranged at the peripheral port of the ejector side pipe; the nozzle device is partially inserted into the ejector side pipe, air suction inlets are symmetrically arranged on the wall of the connecting sleeve, and the connecting sleeve connects the nozzle device with the ejector side pipe through threads; the air supply interface of the nozzle device is connected with the nozzle air supply system through a pipeline, and the liquid inlet interface is connected with the nozzle liquid supply system through a pipeline; the pressure stabilizing system is connected with the ejector air supply system and the nozzle air supply system through pipelines.
The nozzle device provides two media of air and liquid together by the liquid supply system and the nozzle air supply system, atomizes the two media into liquid drops near the outlet position of the nozzle, and then utilizes high-pressure gas of the ejector air supply system to form negative pressure in the ejector side pipe to suck the aerosol mixture into the ejector main pipe so that the aerosol mixture is accelerated and uniformly mixed in the main pipe; the connecting sleeve is provided with an air suction inlet, so that external air is sucked into the side pipe of the ejector, an annular gas channel is formed by utilizing a gap between the outer wall of the nozzle and the inner wall of the side pipe, the gap is 2-5mm wide, negative pressure formed in the side pipe when high-pressure gas is introduced into the main pipe of the ejector is compensated, and in addition, the starting point of an atomization cone angle formed by the nozzle is positioned at the center position of the annular gas channel; the gas flowing in the channel is consistent with the spraying direction of the nozzle, impulse along the spraying direction is applied to the liquid drop particles outside the atomizing cone angle from the spraying start point position, so that the atomizing cone angle formed by atomizing the nozzle is reduced.
The nozzle tip inserted into the ejector side tube is at a distance of 2-10 times the inner diameter of the ejector side tube from the center of the ejector fork, and at this time has the optimum ejector aerosol mixture.
Further, when the included angle between the main pipe of the ejector and the side pipe is within the range of 10-30 degrees, and the insertion end of the straight pipe inserted into the main pipe of the ejector exceeds the distance from the forked starting end of the main pipe of the ejector and the side pipe to the forked center, the ejector can effectively suck the aerosol mixture generated by the nozzle into the main pipe and uniformly disperse the aerosol mixture.
Further, the gas flow rate of the nozzle gas supply pipeline system is in the range of 50-200L/min, and the optimal injection of the aerosol mixture is realized when the droplet diameter is in the range of 20-100 um.
Further, when the gas flow of the ejector gas supply pipeline system is in the range of 50-300L/min, the nozzle atomization cone angle is in the range of 0-10 degrees, and the optimal jet aerosol mixture is provided.
Further, the liquid supply system comprises a liquid storage tank, a water pump, a filter, a one-way valve A, an overflow valve, an energy accumulator, a pressure gauge A, a pressure gauge B, a flowmeter A and a stop valve A; the water pump is positioned in the liquid storage tank, liquid is extracted and then passes through the filter, the liquid supply system is divided into two paths by a three-way pipe fitting after the filter, namely a liquid supply main path and an overflow branch path, the liquid supply main path is sequentially connected with the one-way valve A, the energy accumulator, the stop valve A, the pressure gauge A and the flowmeter A from the three-way pipe fitting, and finally is connected with a liquid interface of the nozzle device; the overflow branch is also sequentially connected with an overflow valve from the three-way pipe fitting and finally returns to the liquid storage tank; the hydraulic control system is used for adjusting the pressure of liquid in the liquid supply main path and relieving the work load of the water pump; the one-way valve A is used for preventing liquid from flowing back to the liquid storage tank after the water pump stops working, so that the nozzle pipeline can supply water in time when the water pump is started next time; the energy accumulator is supplemented by utilizing the gas of a nozzle gas supply pipeline, the fluctuation energy of the liquid in the liquid supply pipeline is buffered and absorbed, the stable flow of the liquid in a liquid supply pipeline system is maintained, an exhaust valve A and a pressure gauge B are arranged at the upper part of the energy accumulator, the preset value of the exhaust valve A is equal to the preset value of an overflow valve of the liquid supply pipeline, and when the gas storage pressure of the energy accumulator is greater than the preset value of the exhaust valve A, the valve is opened to discharge the gas, so that the liquid pressure in the energy accumulator is maintained at the preset value; the flow meter a is used for adjusting the liquid flow of the nozzle device.
Further, the nozzle air supply system comprises a pressure tank A, a pressure stabilizing tank A, a stop valve B, a stop valve C, a pressure reducing valve A, a pressure gauge C and a flowmeter B; the nozzle air supply system is divided into a nozzle air supply main path and an energy accumulator supplementing branch path by a three-way pipe fitting after the pressure tank; the nozzle air supply main path is sequentially connected with the pressure stabilizing tank, the stop valve B, the pressure gauge C and the flowmeter B from the three-way pipe fitting, and is finally connected with the nozzle device air supply interface; the energy accumulator supplementing branch is sequentially connected with the pressure reducing valve A and the stop valve C from the three-way pipe fitting, and is finally connected with the air bag inlet of the energy accumulator of the liquid supply system, and the gas of the nozzle gas supply pipeline is utilized to provide a stable pressure source for the energy accumulator, so that the pressure fluctuation of liquid in the liquid supply pipeline during flowing is reduced; the upper part of the pressure stabilizing air bag of the pressure stabilizing tank A is provided with an exhaust valve B and a pressure gauge D, and the preset value of the exhaust valve B is equal to the gas pressure of the nozzle gas supply pipeline.
Further, the ejector air supply system comprises a pressure tank B, a pressure stabilizing tank B, a stop valve D, a pressure gauge E, a pressure gauge F and a flowmeter C; the ejector air supply system is sequentially connected with a pressure stabilizing tank B, a stop valve D, a pressure meter E and a flowmeter C from a pressure tank B and is finally connected with an ejector air supply interface of the nozzle device; the upper part of the pressure stabilizing air bag of the pressure stabilizing tank B is provided with an exhaust valve C and a pressure gauge F.
Further, the pressure stabilizing system comprises a pressure tank C, a pressure reducing valve B, a pressure reducing valve C, a one-way valve B, a one-way valve C, a stop valve E and a stop valve F; the pressure stabilizing system utilizes the pressure tank C to provide a pressure stabilizing air source to maintain the stability of the air pressure in the air supply pipeline of the nozzle air supply and the ejector air supply pipeline. After the pressure stabilizing system is separated from the pressure tank C, the pressure stabilizing system is divided into two branches by utilizing a three-way pipe fitting, a one-way valve B, a pressure reducing valve B and a stop valve E are sequentially arranged on one branch, and finally the pressure stabilizing system is connected with an air source interface of the pressure stabilizing tank A of the nozzle air supply system; the other branch is sequentially provided with a one-way valve C, a pressure reducing valve C and a stop valve F, and is finally connected with an air source interface of a pressure stabilizing tank B of the ejector air supply system; the branch pressure reducing valve B and the pressure reducing valve C are used for respectively adjusting the gas pressure values in the gas supply pipeline of the nozzle and the gas supply pipeline of the ejector; the branch check valve B and the check valve C are used for preventing the gas in the nozzle gas supply surge tank air bag and the gas in the ejector gas supply surge tank air bag from being mixed, so that the pressure of the two surge tank air bags cannot be set to different pressure values.
The liquid content in the aerosol mixture can be adjusted by adjusting a flowmeter in the liquid supply system; the atomizing size of the liquid drops can be adjusted by adjusting the flowmeter in the nozzle air supply pipeline system, and the larger the air flow, the smaller the atomizing size of the liquid drops; the flow speed of the aerosol mixture in the pipe can be adjusted by adjusting the flowmeter in the air supply pipeline system of the ejector, so that the aerosol mixture has higher heat exchange capacity in the pipe.
The tube heat exchange also comprises a spiral tube.
The two paths of air supply pipelines are separated from each other, so that the selection of different flow rates, pressures, temperatures and working medium types of the gas working mediums in the pipelines can be realized.
Besides water, the liquid adopted by the liquid supply pipeline system can also adopt other liquid with lower boiling temperature or higher boiling temperature, so that the application range of the system under different heat exchange requirements is enlarged.
Summarizing the technical scheme, the invention has the following beneficial effects:
the invention adopts the principles of gas-assisted atomization, ejector injection, convective heat transfer and phase change heat absorption, the gas-assisted atomization nozzle atomizes the cooling liquid to smaller liquid drops, then the ejector accelerates the gas fog mixture, so that the gas fog mixture smoothly flows in the pipe, and simultaneously, the atomization cone angle formed by spraying the nozzle can be reduced, the outer side of the annular gas channel is tightly attached to the inner wall surface of the side pipe of the ejector, the annular gas flows to form a flowing boundary layer on the inner wall of the side pipe, when the liquid drop particles outside the atomization cone angle move towards the wall surface according to the maximum angle direction of the cone angle, the flowing boundary layer can bring the liquid drops collided with the boundary away from the impact point along the flowing direction, thereby avoiding the liquid drops from impacting the wall surface and attaching to the wall surface, further, causing a large number of liquid drops to attach to the wall surface and generating liquid films on the wall surface, ensuring the rapid heat absorption of the gas fog mixture in the pipe, and enabling the pipeline to be cooled rapidly.
In addition, the content of liquid drops, the size of the liquid drops and the mixing flow speed of the aerosol can be regulated by regulating the liquid supply flow, the nozzle air supply flow and the ejector air supply flow, so that the requirement of the tube cooling effect can be met in a larger range.
Besides adopting air, the gas can also use inert gas to prevent the oxidation phenomenon of the tube caused by the gas generated by the phase change evaporation of the liquid, thereby reducing the service life of the tube.
Besides water, other liquid refrigeration media with higher or lower evaporation temperature can be adopted for the liquid, so that the tube heat exchange can be applied to different heat exchange requirement environments.
The cost is lower, the operation is simple and convenient, and the electromagnetic valve can be respectively adopted to control the opening and closing of the pipelines and the flow electric regulating device to realize the remote control of the flow in each pipeline by combining different monitoring technologies, so that the remote automatic control of the cooling system is realized.
The above description is merely given in terms of design principles, and the present invention can be implemented in accordance with the content of the specification so that the technical means of the present invention can be more clearly understood.
Drawings
FIG. 1 is a schematic diagram of an in-tube aerosol-cooling system according to the present invention.
Fig. 2 is a schematic view of the nozzle, connection sleeve and jet connection of the present invention.
FIG. 3 is a schematic view of a nozzle and connection sleeve of the present invention: (a) a connection sleeve, (b) a nozzle, (c) a connection sleeve and nozzle integral (d) a connection sleeve and nozzle integral cross-sectional schematic.
Fig. 4 is a schematic structural view of electromagnetic tapping technology.
Fig. 5 shows the cooling effect of the induction coil for the electromagnetic tapping technique according to the present invention.
In the figure: 1, a water pump; 2, a filter; 31 one-way valve a;32 one-way valve B;33 one-way valve C;4 an accumulator; 51 a shut-off valve a;52 shut-off valve B;53 shut-off valve C;54 shut-off valve D; a 55 stop valve E;56 shut-off valve F;61 manometer a;62 manometer B;63 manometer C;64 manometer D;65 manometer E;66 manometer F;71 flowmeter a;72 flowmeter B;73 flowmeter C;8, an overflow valve; 9 a nozzle device; 10, a liquid storage tank; 11 pressure tank A;12 pressure tank B;131 surge tank a;132 surge tank B;14 a pressure tank C;15 jet means; 161 exhaust valve a;162 exhaust valve B;163 exhaust valve C;171 pressure reducing valve a;172 a pressure reducing valve B;173 relief valve C; a, an air supply interface; b is a liquid inlet port; c an air suction inlet; d, a jet device air supply interface; e heat exchange tube interfaces.
Detailed Description
The operation of the system according to the invention will be described in further detail with reference to the accompanying drawings and the specific embodiments. The scope of the invention is not limited by the specific embodiments.
The invention relates to an in-pipe aerosol cooling system, which is shown in figure 1 and comprises a liquid storage tank 10, a water pump 1, a filter 2, three one-way valves, six stop valves, three pressure reducing valves, an overflow valve 8, an energy accumulator 4, two pressure stabilizing tanks, three pressure tanks, six pressure gauges, three flow meters, a nozzle device 9 and a jet device 15.
Taking the application of the method and the device system in the electromagnetic induction heating tapping technology as an example, the method and the device system concretely comprise the following steps:
the electromagnetic tapping technique (publication numbers CN102274963a, CN1810417 a) uses Fe-C particles with the same or similar composition as the molten steel instead of conventional drainage sand, and melts the sintered Fe-C particles by an induction heating coil placed in a ladle nozzle pocket block, thereby realizing automatic casting. The technology avoids the pollution to molten steel caused by using drainage sand, realizes the ladle casting rate reaching 100 percent, and has extremely wide application prospect. However, the core device induction heating coil used in the technology has the advantages that the temperature of the coil is up to about 800 ℃ under the limit condition due to long-time heat conduction of high-temperature molten steel, the service life of the coil is seriously reduced, and the development of the electromagnetic tapping technology is also restricted.
In order to reduce the temperature of the coil, the temperature can be reduced to about 620 ℃ by arranging a heat insulating material outside the coil, but in the process of electrifying and casting, heat generated by electrifying the coil is almost totally applied to the coil by adopting heat insulating protection to the coil, so that the temperature of the coil is further increased. In order to reduce the high temperature problem of the coil, an efficient cooling mode is required to be adopted for the coil so as to reduce the temperature of the coil. However, the forced single-phase air cooling has low cooling efficiency, and if the single-phase liquid cooling is used, the cooling effect is good, but once the (spiral) pipeline is broken, the cooling liquid leaks, and safety accidents occur when the cooling liquid contacts with molten steel.
Therefore, the in-tube aerosol cooling system can perfectly solve the high temperature problem and self-heating problem of the induction coil in the electromagnetic tapping technology.
The system comprises: the device comprises a liquid supply pipeline system, a nozzle air supply pipeline system, an ejector air supply pipeline system, a pressure stabilizing system and a nozzle device.
The liquid supply pipeline system uses a water pump 1 to pressurize liquid from a liquid storage tank 10, then removes impurities through a filter 2, and uses a three-way pipe fitting to divide the liquid pipeline into a liquid supply pipeline and an overflow branch; the liquid supply pipeline is sequentially connected with a one-way valve A31, an energy accumulator 4, a stop valve A51, a pressure gauge A61 and a flow meter A71 from the three-way pipe fitting and reaches a nozzle liquid inlet interface B, an air bag outlet of the energy accumulator 4 is required to be provided with an exhaust valve 16, the pressure preset value of the air bag outlet is 0.1Mpa, and the pressure in the air bag of the energy accumulator is kept to be 0.1Mpa, namely the pressure in the energy accumulator is stabilized at 0.1Mpa; the overflow branch is connected with the overflow valve 8 from the rear of the three-way pipe fitting and finally returns to the liquid storage tank, the overflow valve is provided with an overflow pressure of 0.1Mpa, and the overflow valve is matched with the energy accumulator to realize that the liquid pressure in the liquid supply pipeline is 0.1Mpa.
The nozzle air supply pipeline system is divided into a main air supply main pipeline and an energy accumulator supplementing branch pipeline from an outlet of a pressure tank A11 by using a three-way pipe fitting, the nozzle air supply main pipeline is sequentially connected with a pressure stabilizing tank A131, a stop valve B52, a pressure meter C63 and a flowmeter B72 from the three-way pipe fitting, and finally is connected with an air supply interface A of a nozzle device 9, an air bag outlet of the pressure stabilizing tank A131 is connected with an exhaust valve B162, the preset value of the air bag outlet is 0.4Mpa, and the internal gas pressure and the internal pressure of the pipe of the nozzle air supply pressure stabilizing tank A131 are kept at 0.4Mpa; the energy accumulator supplementing branch is sequentially connected with a pressure reducing valve A171 and a stop valve C53 from a three-way pipe fitting behind an air compressor of a nozzle air supply system, and is finally connected with an air bag inlet of an energy accumulator of a liquid supply system, and a stable pressure source is provided for the energy accumulator by utilizing gas of a nozzle air supply pipeline; the preset value of the outlet of the pressure reducing valve is set to be 0.1Mpa.
The ejector air supply pipeline system is sequentially connected with a pressure stabilizing tank B132, a stop valve D54, a pressure gauge E65, a pressure gauge F66 and a flowmeter C73 from a pressure tank B, and is finally connected with an ejector air supply interface D which is connected with a spiral pipe through threads; the air bag outlet of the pressure stabilizing tank B132 is connected with the exhaust valve C163 and the pressure gauge F66, the preset value is 0.5Mpa, and the gas pressure in the air supply pipeline of the ejector is ensured to be maintained at 0.5Mpa.
The pressure stabilizing system utilizes the pressure tank C14 to provide a pressure stabilizing air source to maintain the stability of the air pressure of the air supply pipeline of the nozzle air supply and the ejector air supply. After the pressure stabilizing system is separated from the pressure tank C14, the pressure stabilizing system is divided into two branches by utilizing a three-way pipe fitting, a one-way valve B32, a pressure reducing valve B172 and a stop valve E55 are respectively and sequentially arranged on each branch, and finally each branch is respectively connected with an air bag inlet of the pressure stabilizing tank of the nozzle air supply and ejector air supply pipeline system; the branch pressure relief valve B, C is used for respectively adjusting the gas pressure values in the nozzle gas supply and the ejector gas supply pipeline surge tank, and the preset value of the pressure relief valve outlet on the surge tank branch connected with the nozzle gas supply pipeline surge tank is 0.4Mpa, and the preset value of the pressure relief valve outlet on the surge tank branch connected with the ejector gas supply pipeline surge tank is 0.5Mpa; the branch check valve B, C is used for preventing the mixture of the gas in the nozzle gas supply surge tank air bag and the gas in the ejector gas supply surge tank air bag from causing that the pressure of the two surge tank air bags cannot be set to different pressure values.
The nozzle device 9 is connected with the ejector side pipe through threads, and the minimum width of a gap between the outer wall of the nozzle and the inner part of the ejector side pipe is ensured to be 2mm.
The specific operation steps are described in detail below.
Completing the assembly of the system according to the diagram shown in fig. 1, opening all stop valves for liquid supply, nozzle air supply and ejector air supply, starting a water pump 1, a nozzle air supply pressure tank A11 and an ejector air supply pressure tank B12 to switch, and adjusting preset values of an overflow valve 8 of the liquid supply system and a supplement branch pressure reducing valve of an energy accumulator 4; opening a nitrogen cylinder valve of a pressure stabilizing system and stop valves on two branches of the system, and adjusting a preset value of a pressure reducing valve in the system; and adjusting preset values of the exhaust valves of the nozzle air supply system, the pressure stabilizing tank in the ejector air supply system and the upper exhaust valve of the energy accumulator 4 in the liquid supply system, wherein the preset values of the exhaust valves are required to be changed by combining the readings of the pressure stabilizing tank or the upper pressure gauge of the energy accumulator. After the pressure of each pipeline is stable, the valves of the flowmeter in the pipeline system for supplying liquid, supplying air by the nozzle and supplying air by the ejector are regulated, so that the flow value of the required cooling effect is realized.
The experimental results are shown in fig. 4, and it can be seen from the graph that the cooling effect of the air mist on the spiral tube is improved as compared with the cooling effect of the compressed air alone, the temperature of the highest point of the coil is obviously reduced, and the cooling effect is continuously improved along with the increase of the water content.
Claims (4)
1. An in-pipe aerosol cooling system is characterized by comprising a liquid supply system, a nozzle air supply system, an ejector air supply system, a pressure stabilizing system, a nozzle device (9), an ejector (15) and a connecting sleeve; the nozzle device (9) is a two-phase flow nozzle, is of a long cylindrical structure, comprises a bottom air supply interface (A) and a liquid inlet interface (B) below the side part, and is provided with threads on the periphery of the middle part; the whole ejector (15) is of a Y-shaped structure and consists of a main pipe and a side pipe, one side (E) of the main pipe is connected with a pipeline to be cooled, the other side (D) is internally connected with a straight pipe with the caliber smaller than that of the main pipe, one side of the straight pipe is inserted into the main pipe of the ejector and is connected with the main pipe of the ejector through threads, and the other side of the straight pipe is connected with an ejector air supply system; threads are arranged at the peripheral port of the side pipe of the ejector (15); the nozzle device (9) is partially inserted into a side pipe of the ejector (15), air suction inlets (C) are symmetrically arranged on the wall of the connecting sleeve, and the connecting sleeve connects the nozzle device (9) with the side pipe of the ejector (15) through threads; the air supply interface (A) of the nozzle device (9) is connected with the nozzle air supply system through a pipeline, and the liquid inlet interface (B) is connected with the nozzle liquid supply system through a pipeline; the pressure stabilizing system is connected with the ejector air supply system and the nozzle air supply system through pipelines;
the nozzle device (9) is characterized in that a liquid supply system and a nozzle air supply system jointly provide two media of air and liquid, the two media are atomized into liquid drops near the outlet position of the nozzle, and then the high-pressure gas of the ejector air supply system forms negative pressure in the ejector side pipe to suck the aerosol mixture into the ejector main pipe, so that the aerosol mixture is accelerated and uniformly mixed in the main pipe; the connecting sleeve is provided with an air suction inlet (C) and is used for sucking external air into the side pipe of the ejector, an annular gas channel is formed by utilizing a gap between the outer wall of the nozzle and the inner wall of the side pipe, the gap width is 2-5mm, and the starting point of an atomization cone angle formed by the nozzle is positioned at the center of the annular gas channel;
the distance between the top of the nozzle inserted into the ejector side pipe and the center of the ejector bifurcation is 2-10 times of the inner diameter of the ejector side pipe;
the liquid supply system comprises a liquid storage tank (10), a water pump (1), a filter (2), a one-way valve A (31), an overflow valve (8), an energy accumulator (4), a pressure gauge A (61), a pressure gauge B (62), a flowmeter A (71) and a stop valve A (51); the water pump (1) is positioned in the liquid storage tank (10), liquid is extracted and then passes through the filter (2), the liquid supply system is divided into two paths, namely a liquid supply main path and an overflow path, by a three-way pipe fitting after the filter (2), the liquid supply main path is sequentially connected with the one-way valve A (31), the energy accumulator (4), the stop valve A (51), the pressure gauge A (61) and the flow meter A (71) from the three-way pipe fitting, and finally is connected with the liquid inlet interface (B) of the nozzle device (9); the overflow branch is also sequentially connected with an overflow valve (8) from a three-way pipe fitting, and finally returns to the liquid storage tank (10); an exhaust valve A (161) and a pressure gauge B (62) are arranged on the upper part of the energy accumulator (4), the preset value of the exhaust valve A (161) is equal to the preset value of the overflow valve (8) of the liquid supply pipeline, and when the gas storage pressure of the energy accumulator (4) is larger than the preset value of the exhaust valve A (161), the valve is opened to exhaust gas, so that the liquid pressure in the energy accumulator (4) is maintained at the preset value;
the nozzle air supply system comprises a pressure tank A (11), a pressure stabilizing tank A (131), a stop valve B (52), a stop valve C (53), a pressure reducing valve A (171), a pressure gauge C (63) and a flowmeter B (72); the nozzle air supply system is divided into a nozzle air supply main path and an energy accumulator supplementing branch path by a three-way pipe fitting after the pressure tank (11); the nozzle air supply main path is sequentially connected with a pressure stabilizing tank A (131), a stop valve B (52), a pressure gauge C (63) and a flowmeter B (72) from a three-way pipe fitting, and is finally connected with an air supply interface (A) of a nozzle device (9); the energy accumulator supplementing branch is sequentially connected with a pressure reducing valve A (171) and a stop valve C (53) from a three-way pipe fitting, and is finally connected with an air bag inlet of the energy accumulator of the liquid supply system; an exhaust valve B (162) and a pressure gauge D (64) are arranged at the upper part of the pressure stabilizing air bag of the pressure stabilizing tank A (131), and the preset value of the exhaust valve B (162) is equal to the gas pressure of the nozzle gas supply pipeline;
the ejector air supply system comprises a pressure tank B (12), a pressure stabilizing tank B (132), a stop valve D (54), a pressure gauge E (65), a pressure gauge F (66) and a flowmeter C (73); the ejector air supply system is sequentially connected with a pressure stabilizing tank B (132), a stop valve D (54), a pressure gauge E (65) and a flowmeter C (73) from a pressure tank B (12), and is finally connected with an ejector air supply interface (D) of a nozzle device (9); an exhaust valve C (163) and a pressure gauge F (66) are arranged at the upper part of the pressure stabilizing air bag of the pressure stabilizing tank B (132);
the pressure stabilizing system comprises a pressure tank C (14), a pressure reducing valve B (172), a pressure reducing valve C (173), a one-way valve B (32), a one-way valve C (33), a stop valve E (55) and a stop valve F (56); after the pressure stabilizing system is separated into two branches by utilizing a three-way pipe fitting from the pressure tank C (14), a one-way valve B (32), a pressure reducing valve B (172) and a stop valve E (55) are sequentially arranged on one branch, and finally the pressure stabilizing system is connected with an air source interface of a pressure stabilizing tank A (131) of the nozzle air supply system; the other branch is sequentially provided with a one-way valve C (33), a pressure reducing valve C (173) and a stop valve F (56), and is finally connected with an air source interface of a pressure stabilizing tank B (132) of the ejector air supply system.
2. An in-line aerosol cooling system as set forth in claim 1, wherein the ejector is effective to suck the aerosol mixture generated by the nozzle into the main pipe and uniformly disperse when the insertion end of the straight pipe inserted into the main pipe of the ejector exceeds the distance from the branching start end of the main pipe and the side pipe of the ejector to the branching center, and the included angle between the main pipe and the side pipe of the ejector is in the range of 10-30 °.
3. An in-line aerosol cooling system as set forth in claim 1, wherein the nozzle gas supply line system has a gas flow rate in the range of 50-200L/min and a droplet diameter in the range of 20-100 um.
4. An in-line aerosol cooling system as set forth in claim 1, wherein the nozzle atomizing cone angle is in the range of 0-10 ° when the gas flow rate of the ejector gas supply line system is in the range of 50-300L/min.
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| WO2022015517A1 (en) * | 2020-07-16 | 2022-01-20 | Corning Incorporated | Cooling system and methods for glass forming rolls |
| CN114420976A (en) * | 2021-12-29 | 2022-04-29 | 上海重塑能源科技有限公司 | Intake air humidifying system for fuel cell |
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