CN111006416A - In-pipe air mist cooling system - Google Patents
In-pipe air mist cooling system Download PDFInfo
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- CN111006416A CN111006416A CN201911166131.6A CN201911166131A CN111006416A CN 111006416 A CN111006416 A CN 111006416A CN 201911166131 A CN201911166131 A CN 201911166131A CN 111006416 A CN111006416 A CN 111006416A
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- 238000001816 cooling Methods 0.000 title claims abstract description 37
- 239000003595 mist Substances 0.000 title claims description 13
- 239000007788 liquid Substances 0.000 claims abstract description 111
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 50
- 239000000443 aerosol Substances 0.000 claims abstract description 22
- 239000000203 mixture Substances 0.000 claims abstract description 18
- 238000000889 atomisation Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000003860 storage Methods 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 7
- 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
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- 230000000694 effects Effects 0.000 description 6
- 238000010079 rubber tapping Methods 0.000 description 6
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- 238000000034 method Methods 0.000 description 5
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- 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
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
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- 238000002347 injection Methods 0.000 description 1
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- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
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Images
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
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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
- F25B49/00—Arrangement or mounting of control or safety devices
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- 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
Abstract
The invention provides an in-pipe aerosol cooling system which has the principle that high-pressure gas in a nozzle gas supply pipeline forms negative pressure at a nozzle outlet through a nozzle, liquid in a liquid pipeline is sucked out and atomized by using the siphon action, aerosol mixture with atomized liquid drops carries out secondary atomization on the aerosol under the action of high-pressure gas in an ejector pipeline, and the aerosol is accelerated, so that the aerosol has higher speed, the on-way resistance loss of the pipeline can be overcome, the atomizing cone angle of the nozzle can be reduced, and the aerosol mixture can flow in the pipe and the liquid drops in the mixture can be uniformly distributed; 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 high heat exchange efficiency due to the fact that phase change of liquid drops is utilized for absorbing heat, meanwhile, the equipment system is simple to operate, and the content and the diameter of the liquid drops and the flow rate of aerosol are easy to adjust.
Description
Technical Field
The invention belongs to the technical field of flow heat exchange, and relates to an in-pipe air mist cooling system.
Background
At present, the flow heat exchange in the pipe can be mainly divided into single-phase flow heat exchange and two-phase flow heat exchange, the single-phase flow heat exchange can be divided into single-phase gas and single-phase liquid, 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 fins, but the manufacturing cost of the pipe fitting is increased; for single-phase liquid flow heat exchange, although the specific heat capacity is large, the heat exchange capacity is high, when the temperature of the wall surface of the pipe is large or the heat flow density is large, liquid is in contact with the pipe wall and can be rapidly evaporated, steam is generated between the liquid and the pipe wall, heat exchange between the liquid and the pipe wall is blocked, the liquid flow heat exchange capacity is weakened, and even the heat transfer deterioration phenomenon can occur, so that the pipe is damaged. In addition, certain conditions are not suitable for single-phase liquid cooling, and once a pipeline leaks, the potential safety hazard is great; for two-phase flow heat exchange, gas and liquid can be layered in the tube, so that the heat exchange of the tube wall is not uniform, and the thermal stress deformation is easy to generate. How to improve the heat exchange capability as much as possible on the basis of not increasing the manufacturing cost of the heat exchange tube is a main problem in the technical field of heat exchange flow in the tube.
Spray cooling is one of the novel cooling modes at present, and is a high heat flow forced cooling technology which mainly utilizes high-pressure gas or external power to atomize liquid into small droplets of 20-100um through a nozzle, forcibly sprays the small droplets onto the surface of a heated object to form a liquid film, and takes away heat through single-phase flow heat exchange and droplet 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 the liquid drops and introduces the 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 current spray cooling is only limited to large space heat exchange or a heat exchange mode of spraying the spray cooling to a heat exchange wall surface at a certain angle, and cannot be applied to small-caliber pipelines or pipelines with complex shapes (such as spiral pipes). For the heat exchange of the flowing liquid in the pipe, no scholars propose related technical means at present, mainly because the existence of the atomization cone angle causes the liquid drops to impact the inner wall of the pipe, so that the liquid drops are condensed on the inner wall of the pipe. How to weaken the atomizing cone angle of the nozzle and how to make liquid drops impact the inner wall of the pipe becomes a main reason for restricting the application of spray cooling to the flow heat exchange in the pipe.
Disclosure of Invention
The invention aims to provide a system and a method for cooling air mist in a pipe, which improve the heat exchange efficiency of a heat exchanger, can quickly reduce the temperature of the pipe in a short time, breaks through the limitation of the traditional spray cooling method, and has the advantages of simple installation, convenient use and operation, timely response, high heat exchange efficiency and the like.
The invention adopts the following technical scheme to achieve the purpose of the invention.
The invention provides an in-pipe air mist 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, wherein the nozzle device is arranged in the pipe; the nozzle device is a two-phase flow nozzle, is of a long cylindrical structure as a whole, and comprises a bottom air supply interface and a liquid inlet interface below the side part, and the periphery of the middle part is provided with threads; the jet device is integrally of a Y-shaped structure and comprises a main pipe and a side pipe, wherein one side of the main pipe is connected with a pipeline to be cooled, a straight pipe with the caliber smaller than that of the main pipe is connected inside the other side 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 an air supply system of the jet device; threads are arranged at the peripheral port of the side pipe of the jet device; the nozzle device is partially inserted into the side pipe of the ejector, air suction ports are symmetrically arranged on the wall of the connecting sleeve, and the connecting sleeve connects the nozzle device with the side pipe of the ejector 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 simultaneously connected with the ejector gas supply system and the nozzle gas supply system through pipelines.
The nozzle device is characterized in that a liquid supply system and a nozzle gas supply system jointly provide two media of gas and liquid, the two media are atomized into liquid drops near the outlet position of the nozzle, and then high-pressure gas of the ejector gas supply system forms negative pressure inside a side pipe of the ejector to suck an aerosol mixture into a main pipe of the ejector, so that the aerosol mixture is accelerated and uniformly mixed in the main pipe; the connecting sleeve is provided with an air suction inlet which is used for sucking outside 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 width of the gap is 2-5mm, negative pressure formed inside 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 central position of the annular gas channel; the gas flowing in the channel is consistent with the spraying direction of the nozzle, an impulse along the spraying direction is applied to the liquid drop particles outside the atomizing cone angle from the spraying starting point position, the atomizing cone angle formed by the nozzle in an atomizing mode is reduced, in addition, the gas flowing in the channel can compensate the entrainment effect of the nozzle on the air around the nozzle when the nozzle atomizes the liquid, and the reduction of the atomizing cone angle is facilitated.
The distance between the top of the nozzle inserted into the side pipe of the ejector and the bifurcation center of the ejector is 2-10 times of the inner diameter of the side pipe of the ejector, and the optimal mixture for ejecting the aerial fog is provided.
Furthermore, when the included angle between the main pipe and the side pipe of the ejector 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 starting end of the bifurcation of the main pipe and the side pipe of the ejector to the center of the bifurcation, the ejector can effectively suck the aerosol mixture generated by the nozzle into the main pipe and uniformly disperse the aerosol mixture.
Furthermore, when the gas flow range of the nozzle gas supply pipeline system is 50-200L/min and the droplet diameter is in the range of 20-100um, the optimal ejection aerosol mixture is provided.
Furthermore, when the gas flow of the gas supply pipeline system of the ejector is within the range of 50-300L/min, the atomizing cone angle of the nozzle is within the range of 0-10 degrees, and the optimal ejecting 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 liquid supply system is divided into two paths, namely a liquid supply main path and an overflow branch path, through a three-way pipe fitting after the filter, the liquid supply main path is sequentially connected with a one-way valve A, an energy accumulator, a stop valve A, a pressure gauge A and a flowmeter A from the three-way pipe fitting and finally connected with a liquid interface of the nozzle device; the overflow branch is also connected with an overflow valve in sequence from the tee pipe fitting and finally returns to the liquid storage tank; the pressure regulating device is used for regulating the pressure of liquid in the liquid supply main path and relieving the work load of the water pump; the check valve A is used for preventing liquid from flowing back to the liquid storage tank after the water pump stops working, and ensuring that the nozzle pipeline supplies water in time when the water pump is started next time; the energy accumulator is supplemented by gas of a nozzle gas supply pipeline, wave energy of liquid in the liquid supply pipeline is buffered and absorbed, stable flow of the liquid in the liquid supply pipeline system is maintained, an exhaust valve A and a pressure gauge B are installed on the upper portion 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 exhaust the gas, so that the liquid pressure in the energy accumulator is maintained at the preset value; the flowmeter A is used for regulating 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 gas supply system is divided into a nozzle gas supply main path and an energy accumulator supplementing branch path by a three-way pipe fitting behind the pressure tank; the main nozzle air supply path is sequentially connected with a pressure stabilizing tank, a stop valve B, a pressure gauge C and a flowmeter B from a tee pipe fitting and is finally connected with an air supply interface of the nozzle device; the energy accumulator supplementing branch is sequentially connected with a pressure reducing valve A and a stop valve C from a three-way pipe fitting, and is finally connected with an air bag inlet of the energy accumulator of the liquid supply system, and gas in a nozzle gas supply pipeline is used for providing a stable pressure source for the energy accumulator, so that pressure fluctuation of liquid in the liquid supply pipeline during flowing is reduced; and an exhaust valve B and a pressure gauge D are arranged at the upper part of the pressure stabilizing air bag of the pressure stabilizing tank A, and the preset value of the exhaust valve B is equal to the gas pressure of the nozzle gas supply pipeline.
Further, the ejector gas 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 jet device air supply system is sequentially connected with a pressure stabilizing tank B, a stop valve D, a pressure gauge E and a flow meter C from a pressure tank B, and is finally connected with an jet device air supply interface of the nozzle device; and an exhaust valve C and a pressure gauge F are arranged at the upper part of the pressure stabilizing air bag of the pressure stabilizing tank B.
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 air pressure in the air supply pipeline of the nozzle and the ejector. The pressure stabilizing system is divided into two branches by using a three-way pipe fitting after the pressure tank C, and a check valve B, a pressure reducing valve B and a stop valve E are sequentially arranged on one branch and are finally connected with an air source interface of a pressure stabilizing tank A of the nozzle air supply system; the other branch is sequentially provided with a check valve C, a pressure reducing valve C and a stop valve F and is finally connected with a pressure stabilizing tank B air source interface of an ejector air supply system; the branch pressure reducing valve B and the pressure reducing valve C are used for respectively adjusting the pressure values of gas supplied by the nozzle and gas in the gas supply pipeline of the ejector; the branch one-way valve B and the one-way valve C are used for preventing gas in the nozzle gas supply surge tank air bag and gas in the ejector gas supply surge tank air bag from mixing, and the pressure of the two surge tank air bags cannot be set to different pressure values.
The liquid content in the gas-fog mixture can be adjusted by adjusting a flowmeter in the liquid supply system; the atomization size of the liquid drops can be adjusted by adjusting a flow meter in the nozzle air supply pipeline system, and the larger the air flow is, the smaller the atomization size of the liquid drops is; the flow speed of the aerosol mixture in the pipe can be adjusted by adjusting the flow meter in the jet device air supply pipeline system, so that the aerosol mixture has high heat exchange capacity in the pipe.
The tube heat exchange also includes a spiral tube.
The two gas supply pipelines are separated from each other, so that the selection of different gas working media in each pipeline, such as different flow rates, different pressures, different temperatures and different types of working media, can be realized.
The liquid adopted by the liquid supply pipeline system can adopt other liquid with lower boiling temperature or higher boiling temperature besides water, thereby expanding the application range of the system under different heat exchange requirements.
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 cooling liquid is atomized to smaller liquid drops by a gas-assisted atomizing nozzle, then the gas-assisted atomizing nozzle is utilized to accelerate the gas-mist mixture, so that the gas-mist mixture flows smoothly in the pipe, meanwhile, the atomizing cone angle formed by nozzle spraying can be reduced, the outer side of an annular gas channel is tightly attached to the inner wall surface of a side pipe of the ejector, a flowing boundary layer can be formed on the inner wall of the side pipe when the annular gas flows, the flowing boundary layer can bring the liquid drops colliding to the boundary away from an impact point along the flowing direction when liquid drop particles outside the atomizing cone angle move to the wall surface according to the maximum angle direction of the cone angle, the liquid drops are prevented from colliding with the wall surface and attaching to the wall surface, and then a large amount of liquid.
In addition, the content of liquid drops, the size of the liquid drops and the mixed flow speed of aerial fog can be adjusted by adjusting the liquid supply flow, the air supply flow of the nozzle and the air supply flow of the ejector, and the requirement of the pipe cooling effect can be met in a larger range.
Besides air, inert gas can be used as gas, so that the phenomenon that the gas generated by liquid phase change evaporation generates oxidation on the tube is prevented, and the service life of the tube is shortened.
Besides water, other liquid refrigeration media with higher or lower evaporation temperature can be adopted as the liquid, so that the tube heat exchange can be applied to different heat exchange requirements.
The cost is lower, easy and simple to handle, combines different monitoring technologies, can adopt solenoid valve control pipeline's switching and adopt flow electric regulating apparatus to realize the remote control flow size in each pipeline respectively, realizes the remote automatic control of cooling system.
The above description is made only by the principle of design, and the technical means of the present invention can be more clearly understood by following the content of the description.
Drawings
Fig. 1 is a schematic diagram of an in-tube mist cooling system according to the present invention.
Fig. 2 is a schematic view of the nozzle, connecting sleeve and ejector connection of the present invention.
FIG. 3 is a schematic view of a nozzle and connecting sleeve of the present invention: (a) a connecting sleeve, (b) a nozzle, (c) a connecting sleeve and a nozzle body, (d) a connecting sleeve and a nozzle body are integrally sectional schematic views.
FIG. 4 is a schematic structural diagram of electromagnetic tapping.
FIG. 5 shows the cooling effect of the present invention on the induction coil of the electromagnetic tapping technique.
In the figure: 1, a water pump; 2, a filter; 31 a one-way valve A; 32 a check valve B; 33 a check valve C; 4 an accumulator; 51 stop valve A; 52 stop valve B; 53 stop valve C; 54 stop valve D; 55 stop valve E; 56 stop valve F; 61 pressure gauge A; 62 pressure gauge B; 63 pressure gauge C; a 64 pressure gauge D; 65 pressure gauge E; 66 pressure gauge F; 71, a flowmeter A; 72 flow meter B; 73 flow meter 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 pressure tank C; 15 an ejector; 161 exhaust valve A; 162 exhaust valve B; 163 exhaust valve C; 171 pressure reducing valve a; 172 pressure relief valve B; 173 pressure reducing valve C; a, an air supply interface; b, a liquid inlet interface; c, an air suction inlet; d, an air supply interface of the ejector; e, heat exchange pipe interface.
Detailed Description
The operation of the system of the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. The scope of the invention is not limited by the specific embodiments.
The invention relates to an in-pipe air mist cooling system, which 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 an ejector 15, as shown in figure 1.
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 are as follows:
the electromagnetic tapping technology (publication No. CN102274963A, CN1810417A) uses Fe-C particles with the same or similar components with molten steel to replace the traditional flow guiding sand, and realizes automatic casting by melting the sintered Fe-C particles through an induction heating coil arranged in a ladle nozzle pocket brick. The technology avoids the pollution of the drainage sand to the molten steel, realizes the ladle casting rate of 100 percent, and has very wide application prospect. However, the induction heating coil used as the core device in the technology is subjected to heat conduction of high-temperature molten steel for a long time, so that the temperature of the coil reaches about 800 ℃ under the limit condition, the service life of the coil is seriously reduced, and the development of the electromagnetic steel 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 insulation material outside the coil, but in the electrifying casting process, because the coil is protected by heat insulation, almost all heat generated by the self-electrifying of the coil is applied to the coil, and the temperature of the coil is further increased. In order to reduce the high temperature problem of the coil, an efficient cooling method needs to be adopted for the coil so as to reduce the temperature of the coil. However, the cooling efficiency by forced single-phase air cooling is low, and if single-phase liquid cooling is used, although the cooling effect is good, once the (spiral) pipeline is broken and the cooling liquid leaks, a safety accident will occur when the cooling liquid contacts with the molten steel.
Therefore, the in-pipe air mist cooling system can perfectly solve the high temperature problem and the self-heating problem of the induction coil in the electromagnetic steel tapping technology.
The system comprises: the jet device comprises a liquid supply pipeline system, a nozzle air supply pipeline system, a jet device air supply pipeline system, a pressure stabilizing system and a nozzle device.
The liquid supply pipeline system utilizes a water pump 1 to pressurize liquid from a liquid storage tank 10, then removes impurities through a filter 2, and utilizes a three-way pipe to divide the liquid pipeline into a liquid supply pipeline and an overflow branch; the liquid supply pipeline is sequentially connected with a check valve A31, an energy accumulator 4, a stop valve A51, a pressure gauge A61 and a flow meter A71 from the rear of the three-way pipe fitting to reach a liquid inlet interface B of the nozzle, an exhaust valve 16 is required to be installed at the air bag outlet of the energy accumulator 4, the preset pressure value is selected to be 0.1Mpa, the pressure in the air bag of the energy accumulator is kept to be 0.1Mpa, and namely the pressure in the energy accumulator is stabilized to be 0.1 Mpa; the overflow branch is connected with an overflow valve 8 from the back of the tee pipe fitting and finally returns to the liquid storage tank, the overflow pressure of the overflow valve is 0.1Mpa, and the overflow valve is matched with the energy accumulator to realize that the liquid pressure in the liquid supply pipeline is 0.1 Mpa.
The nozzle gas supply pipeline system is divided into a main gas supply main pipeline and an energy accumulator supplementing branch pipeline from the outlet of a pressure tank A11 by using a tee pipe fitting, the nozzle gas supply main pipeline is sequentially connected with a pressure stabilizing tank A131, a stop valve B52, a pressure gauge C63 and a flow meter B72 from the tee pipe fitting, and is finally connected with a gas supply interface A of the nozzle device 9, the outlet of an air bag of the pressure stabilizing tank A131 is connected with a gas exhaust valve B162, the preset value of the gas exhaust valve B162 is 0.4MPa, and the internal gas pressure and the internal pressure of the nozzle gas supply pressure stabilizing tank A131 are guaranteed to be maintained at; the energy accumulator supplementing branch is sequentially connected with a pressure reducing valve A171 and a stop valve C53 from a three-way pipe behind an air compressor of a nozzle air supply system, and is finally connected with an air bag inlet of the energy accumulator of the liquid supply system, and the gas of the nozzle air supply system is used for providing a stable pressure source for the energy accumulator; the preset value of the outlet of the pressure reducing valve is set to be 0.1 MPa.
The jet device 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 flow meter C73 from a pressure tank B, and is finally connected with a jet device air supply interface D, and the jet device interface is in threaded connection with a spiral pipe; the air bag outlet of the pressure stabilizing tank B132 is connected with an exhaust valve C163 and a pressure gauge F66, the preset value of the pressure stabilizing tank is 0.5Mpa, and the gas pressure in the air supply pipeline of the ejector is ensured to be maintained at 0.5 Mpa.
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 and the ejector. The pressure stabilizing system is divided into two branches by using a three-way pipe fitting from the back of a pressure tank C14, a check 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 a pressure stabilizing tank of a nozzle air supply and ejector air supply pipeline system; the branch pressure reducing valve B, C is used for respectively adjusting the pressure values of gas in the nozzle gas supply and ejector gas supply pipeline pressure stabilizing tank, the preset value of a pressure reducing valve outlet on the pressure stabilizing branch connected with the nozzle gas supply pipeline pressure stabilizing tank is 0.4MPa, and the preset value of a pressure reducing valve outlet on the pressure stabilizing branch connected with the ejector gas supply pipeline pressure stabilizing tank is 0.5 MPa; the branch check valve B, C is for preventing that the gas in the nozzle air feed surge tank gasbag and the gas in the ejector air feed surge tank gasbag from mixing, causes two surge tank gasbag pressures can't set up different pressure values.
The nozzle device 9 is connected with the side pipe of the ejector through threads, and the minimum width of a gap between the outer wall of the nozzle and the inner part of the side pipe of the ejector is ensured to be 2mm.
The specific operation steps are detailed as follows.
According to the assembly of the system shown in the figure 1, opening all stop valves for liquid supply, nozzle gas supply and jet device gas supply, starting the water pump 1, the nozzle gas supply pressure tank A11 and the jet device gas supply pressure tank B12 to be switched, and adjusting the preset values of the relief valve of the replenishing branch of the overflow valve 8 and the energy accumulator 4 of the liquid supply system; opening a nitrogen cylinder valve of a pressure stabilizing system and stop valves on two branches of the system, and adjusting the preset value of a pressure reducing valve in the system; and adjusting preset values of an exhaust valve at the upper part of an energy accumulator 4 in the nozzle gas supply system, the pressure stabilizing tank in the ejector gas supply system and the liquid supply system, wherein the adjustment of the preset value of the exhaust valve needs to be changed by combining with the reading of a pressure gauge at the upper part of the pressure stabilizing tank or the energy accumulator. And after the pressure of each pipeline is stable, adjusting valves of flow meters in the liquid supply, nozzle gas supply and ejector gas supply pipeline system to realize the flow numerical value of the required cooling effect.
The experimental result is shown in fig. 4, and it can be seen from the figure that the cooling effect is continuously improved as the highest point temperature of the coil is obviously reduced and the water content is increased when the spiral pipe is cooled by using the gas mist rather than the compressed air.
Claims (8)
1. An in-pipe air mist 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 as a whole, and comprises a bottom air supply interface (A) and a liquid inlet interface (B) below the side part, and the periphery of the middle part is provided with threads; the ejector (15) is integrally 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, a straight pipe with the caliber smaller than that of the main pipe is connected inside the other side (D), 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 air supply system of the ejector; threads are arranged at the peripheral end of the side pipe of the ejector (15); the part of the nozzle device (9) is inserted into a side pipe of the ejector (15), air suction ports (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 simultaneously connected with the ejector gas supply system and the nozzle gas supply system through pipelines;
the nozzle device (9) is provided with two media of gas and liquid by a liquid supply system and a nozzle gas supply system, and is atomized into liquid drops near the outlet position of the nozzle, and then the high-pressure gas of the jet device gas supply system forms negative pressure in the side pipe of the jet device to suck the aerosol mixture into the main pipe of the jet device, 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) for sucking outside 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 width of the gap is 2-5mm, and the starting point of an atomization cone angle formed by the nozzle is positioned at the central position of the annular gas channel;
the distance between the top of the nozzle inserted into the side pipe of the ejector and the branching center of the ejector is 2-10 times of the inner diameter of the side pipe of the ejector.
2. The in-pipe aerosol cooling system of claim 1, wherein the angle between the main pipe of the ejector and the side pipe is in the range of 10 to 30 °, and the straight pipe inserted into the main pipe of the ejector has an insertion end exceeding the distance from the start end of the bifurcation of the main pipe of the ejector and the side pipe to the center of the bifurcation, so that the ejector can effectively suck and uniformly disperse the aerosol mixture generated from the nozzle into the main pipe.
3. The in-pipe fog cooling system of claim 1, wherein 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 accumulator (4), a pressure gauge A (61), a pressure gauge B (62), a flow meter A (71), and a stop valve A (51); the liquid supply system is characterized in that a water pump (1) is positioned in a liquid storage tank (10), liquid is pumped and then passes through a filter (2), the liquid supply system is divided into a liquid supply main path and an overflow branch path through a tee pipe fitting after the filter (2), the liquid supply main path is sequentially connected with a check valve A (31), an energy accumulator (4), a stop valve A (51), a pressure gauge A (61) and a flowmeter A (71) from the tee pipe fitting, and finally is connected with a liquid inlet interface (B) of a nozzle device (9); the overflow branch is also connected with an overflow valve (8) in sequence from the tee pipe fitting and finally returns to the liquid storage tank (10); an exhaust valve A (161) and a pressure gauge B (62) are installed at 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 liquid supply pipeline overflow valve (8), 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 discharge gas, so that the liquid pressure in the energy accumulator (4) is maintained at the preset value.
4. The in-pipe fog cooling system of claim 1, wherein the nozzle gas supply system comprises a pressure tank a (11), a surge tank a (131), a shut-off valve B (52), a shut-off valve C (53), a pressure relief valve a (171), a pressure gauge C (63), a flow meter B (72); the nozzle gas supply system is divided into a nozzle gas supply main path and an energy accumulator supplementing branch path by a tee pipe fitting behind 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 tee pipe fitting, and is finally connected with an air supply interface (A) of the 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 an energy accumulator of a 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.
5. The in-pipe mist cooling system of claim 1, wherein the ejector air supply system comprises a pressure tank B (12), a surge tank B (132), a shutoff valve D (54), a pressure gauge E (65), a pressure gauge F (66), a flow meter C (73); the jet device 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 flow meter C (73) from a pressure tank B (12), and is finally connected with a jet device air supply interface (D) of the nozzle device (9); and 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).
6. The in-pipe fog cooling system of claim 1, wherein the pressure stabilizing system comprises a pressure tank C (14), a pressure reducing valve B (172), a pressure reducing valve C (173), a check valve B (32), a check valve C (33), a shut-off valve E (55), a shut-off valve F (56); the pressure stabilizing system is divided into two branches by using a three-way pipe fitting after the pressure tank C (14), one branch is sequentially provided with a check valve B (32), a pressure reducing valve B (172) and a stop valve E (55), 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; and the other branch is sequentially provided with a check 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.
7. The in-pipe aerosol cooling system of claim 1, wherein the gas flow rate of the nozzle gas supply line system is in the range of 50-200L/min and the droplet diameter is in the range of 20-100 um.
8. The in-pipe aerosol cooling system of claim 1, wherein the nozzle spray 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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