CN107271335B - Spray wall collision experimental device suitable for ocean thermoelectric power generation system falling film evaporator - Google Patents
Spray wall collision experimental device suitable for ocean thermoelectric power generation system falling film evaporator Download PDFInfo
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- 239000007921 spray Substances 0.000 title claims abstract description 42
- 239000011552 falling film Substances 0.000 title claims abstract description 16
- 238000010248 power generation Methods 0.000 title claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 58
- 239000007788 liquid Substances 0.000 claims abstract description 27
- 238000012546 transfer Methods 0.000 claims abstract description 21
- 239000002245 particle Substances 0.000 claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 11
- 238000003384 imaging method Methods 0.000 claims description 11
- 238000003860 storage Methods 0.000 claims description 9
- 238000002474 experimental method Methods 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 5
- 230000037431 insertion Effects 0.000 claims description 5
- 238000000889 atomisation Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000011160 research Methods 0.000 abstract description 3
- 230000007246 mechanism Effects 0.000 abstract description 2
- 238000012827 research and development Methods 0.000 abstract description 2
- 230000001052 transient effect Effects 0.000 abstract 1
- 239000013535 sea water Substances 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000003703 image analysis method Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N2015/0003—Determining electric mobility, velocity profile, average speed or velocity of a plurality of particles
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Abstract
The invention relates to a spray wall collision experimental device suitable for a falling film evaporator of an ocean temperature difference power generation system, which is characterized in that: the device comprises a spray droplet group generation system, a wall surface heating system, a wall surface control system and a flowing heat transfer test system; the spray droplet group generating system sprays the generated spray droplets to the wall surface heating system, the wall surface heating system is connected with the wall surface control system, and the flowing heat transfer testing system is used for collecting flowing parameters and heat transfer parameters of the wall surface heating system. The invention can directly measure the wall collision speed and the atomized particle size of atomized liquid drops, observe the strong transient process of the atomized liquid drop group colliding with the surface of the tube bundle, realize the measurement of the flow heat transfer characteristics of the tube bundle with different temperatures of the atomized liquid drops colliding under different collision speeds, atomized particle sizes and collision angles, provide a basis for the deep research of the wall collision mechanism of the atomized liquid drops and provide experimental support for the research and development of the high-efficiency spray type falling-film evaporator.
Description
Technical Field
The invention relates to a spray wall-collision experimental device, in particular to a spray wall-collision experimental device suitable for an ocean temperature difference energy power generation falling film evaporator.
Background
At present, ocean temperature difference energy reserves are huge, and have advantages such as clean renewable and all-weather operation, ocean temperature difference energy resource development and utilization is an important option of guarantee island reef power supply. Because the temperature difference between the cold seawater and the hot seawater is limited, the energy quality is low, and a large amount of surface temperature seawater is needed to be used for ensuring that the heat load of the evaporator is enough to evaporate the circulating working medium, so that the size of the evaporator is large, and the engineering cost is high. Therefore, the development of high-efficiency evaporators is very important.
The visual experiment device for liquid drop collision wall surface by researchers at home and abroad is realized in the mode that liquid drops are formed by adopting a needle head, the needle head is hung at a certain height, the liquid drops freely fall to vertically collide with a horizontal wall surface, and the whole process before and after the liquid drops collide with the wall surface is recorded by adopting a high-speed camera. The method is researched aiming at single liquid drop, the influence of interaction between the liquid drops of the spray colliding wall is not considered, and the wall colliding speed of the liquid drops is small due to the limited suspension height. Meanwhile, the wall-collision speed of the liquid drop cannot be directly tested, the wall-collision speed is obtained by calculating according to the law of free fall and is influenced by the limitation of an image analysis method, a certain error exists between the calculated wall-collision speed and the actual wall-collision speed, and the existing device is used for researching a liquid drop collision plane, so that the influence of the liquid drop collision on the surface of a tube bundle and the impact angle cannot be researched. In addition, the existing spray experimental device can only realize the research of free spraying, and the wall collision process of spray liquid drop groups cannot be observed.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a spray wall-collision experimental device suitable for a falling film evaporator of an ocean temperature difference power generation system, which can realize the visual observation of the process that a spray droplet group collides with the surface of a tube bundle, and has high simulation degree and accurate experimental result.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a wall experimental apparatus is hit in spraying suitable for ocean thermoelectric generation system falling film evaporation ware which characterized in that: the device comprises a spray droplet group generation system, a wall surface heating system, a wall surface control system and a flowing heat transfer test system; the spray droplet group generating system sprays the generated spray droplets to the wall surface heating system, the wall surface heating system is connected with the wall surface control system, and the flowing heat transfer testing system is used for collecting flowing parameters and heat transfer parameters of the wall surface heating system.
Further, the spray droplet group generation system comprises a storage tank, a pipeline, a working medium pump and a nozzle; the output end of the storage tank is connected with the inlet of the working medium pump through the pipeline, and the outlet of the working medium pump is connected with the nozzle through the pipeline; the nozzle is located above the wall heating system.
Furthermore, a valve and a pressure gauge are arranged on the pipeline between the storage tank and the working medium pump.
Further, the nozzle is a pressure atomization nozzle.
Further, the wall surface heating system comprises a heating device, a heating rod and a thermocouple; the heating device is of a T-shaped structure and is formed by welding a heating column and a tube bundle, and the tube bundle is connected with the wall surface control system; the heating rod is arranged on one side of the heating column, and the thermocouple is arranged on one side of the tube bundle; the nozzle is located above the tube bundle, and the arrangement position of the thermocouple on the tube bundle is located within the spraying range of the nozzle.
Furthermore, a plurality of blind holes are formed in the heating column at intervals, the heating rod is installed on the heating column through the blind holes, a plurality of insertion holes are formed in the tube bundle at intervals, and the thermocouple is inserted into the surface of the tube bundle from bottom to top through the insertion holes.
Further, the wall surface control system comprises a base, a support, a sliding support and a crankshaft; the support is arranged at one end of the base, and the crankshaft is arranged at the other end of the base; the base close to one side of the crankshaft is also provided with the sliding support; one end of the tube bundle is placed on the support, and the other end of the tube bundle is connected to the sliding support; the sliding support is connected with the crankshaft.
Further, the sliding bracket comprises a sliding plate and a fixed seat; the fixed seat is fixed on the base, the fixed seat is provided with a mounting hole, one side of the sliding plate is connected with the tube bundle, and the lower part of the joint of the sliding plate and the tube bundle is movably connected with the fixed seat through the mounting hole; the middle part of the other side of the sliding plate is connected with the crankshaft.
Furthermore, the sliding plate is made of sheet steel plates, and scales are arranged on the sliding plate inserted in the mounting hole.
Further, the flowing heat transfer testing system comprises a particle imaging velocimeter, a high-speed camera and a computer; the particle imaging velocimeter transmits the measured wall collision speed and the measured atomized particle size of the atomized liquid drop to the computer; and the high-speed camera transmits the shot state image information to the computer.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. the invention adopts a high-speed microscopic camera to observe the phenomena of spreading, splashing, rebounding and the like of the spray liquid drops after contacting with the surface of the tube bundle, and can realize the visual observation of the process of the spray liquid drop group colliding with the surface of the tube bundle. 2. The invention adopts the particle imaging velocimeter to carry out measurement, and can realize the measurement of the flow heat transfer characteristic of the spray droplet group colliding with the surface of the tube bundle under different collision speeds and different atomization particle diameters by adjusting the height of the particle imaging velocimeter. 3. The height of the sliding support can be changed by adjusting the crankshaft, so that the measurement of the flow heat transfer characteristic of the spray droplet group impacting the surface of the tube bundle at different impact angles can be realized. 4. The invention can obtain the surface temperatures of different tube bundles by adjusting the power of the heating rod, and can realize the measurement of the flowing heat transfer characteristics of the spray droplet group colliding with the surfaces of the tube bundles with different temperatures. 5. The invention adopts the falling film evaporator to enable the working medium to flow in a film shape along the surface of the heating tube bundle, and compared with the traditional flooded evaporator, the evaporator has higher heat transfer coefficient and good evaporation effect. 6. The spray-type falling-film evaporator provided by the invention atomizes the working medium by adopting the nozzle, so that the working medium is uniformly coated along the heating tube bundle, and the performance of the whole evaporator is high. In conclusion, the device can realize the optimized design of the falling-film evaporator by mastering the flowing and heat transfer characteristic rules of the surface of the spray collision heating tube bundle under different collision speeds and atomization particle sizes, provides a basis for deep research on a spray wall collision mechanism, provides experimental support for research and development of a high-efficiency spray type falling-film evaporator, and can be widely applied to an ocean temperature difference power generation system.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the wall heating system of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
As shown in fig. 1 and fig. 2, the invention provides a spray wall-collision experimental device suitable for a falling film evaporator of an ocean temperature difference power generation system, which comprises a spray droplet group generation system, a wall surface heating system, a wall surface control system and a flow heat transfer test system. The spray droplet group generation system sprays the generated spray droplets to the wall surface heating system, the wall surface heating system is connected with the wall surface control system, the wall surface control system adjusts the angle of the wall surface heating system, and the flowing heat transfer test system is used for collecting the flowing parameters and the heat transfer parameters of the wall surface heating system.
In a preferred embodiment, the spray droplet mass generation system comprises a tank 1, a line 2, a working fluid pump 3 and a nozzle 4. The output end of the storage tank 1 is connected with the inlet of a working medium pump 3 through a pipeline 2, and the outlet of the working medium pump 3 is connected with a nozzle 4 through the pipeline 2; the nozzle 4 is located above the wall heating system. When the device is used, liquid in the storage tank 1 is conveyed to the nozzle 4 through the working medium pump 3 and atomized to form a liquid drop group. Wherein, the wall collision speed and the atomized particle size of the atomized liquid drops can be adjusted by changing the power of the working medium pump 3.
In the above embodiment, the pipeline 2 between the storage tank 1 and the working medium pump 3 is provided with the valve 5 and the pressure gauge 6.
In the above embodiments, the nozzle 4 is a pressure atomizing nozzle.
In a preferred embodiment, as shown in fig. 2, the wall heating system comprises a heating device 7, a heating rod 8 and a thermocouple 9; the heating device 7 is of a T-shaped structure and is formed by welding a heating column 10 and a tube bundle 11, and the tube bundle 11 is connected with a wall surface control system. A heating rod 8 is arranged at one side of the heating column 10, and a thermocouple 9 is arranged at one side of the tube bundle 11. The nozzle 4 is located above the tube bundle 11, and the position where the thermocouple 9 is disposed on the tube bundle 11 is located within the spraying range of the nozzle 4. In the experiment, in order to simulate the condition of an ocean temperature difference heat source, the surface temperatures of different tube bundles 11 can be obtained by adjusting the power of the heating rod 8, and the surface temperature of the tube bundles 11 is controlled to be 25-35 ℃.
In the above embodiment, the heating column 10 is provided with a plurality of blind holes at intervals, and the heating rod 8 is mounted on the heating column 10 through the blind holes. The tube bundle 11 is provided with a plurality of jacks at intervals, the thermocouple 9 is inserted into the surface of the tube bundle 11 from bottom to top through the jacks, and the temperature distribution on the surface of the tube bundle 11 in the wall collision process can be measured in real time. In the present embodiment, the number of the blind holes is preferably 4, and the number of the insertion holes is preferably 5.
In the above embodiments, the heating column 10 and the tube bundle 11 are made of the same material, for example, a titanium alloy material.
In a preferred embodiment, the wall control system includes a base 12, a support 13, a sliding bracket 14, and a crankshaft 15. One end of the base 12 is provided with a support 13, and the other end of the base 12 is provided with a crankshaft 15; the base 12 near the crankshaft 15 is also provided with a sliding bracket 14. One end of the tube bundle 11 is placed on the support 13, and the other end of the tube bundle 11 is connected to the sliding support 14; the sliding bracket 14 is connected with a crankshaft 15, and the crankshaft 15 drives the sliding bracket 14 to move.
In the above embodiment, the sliding bracket 14 includes the sliding plate 16 and the fixed base 17. The fixing seat 17 is fixed on the base 12, a mounting hole is formed in the fixing seat 17, one side of the sliding plate 16 is connected with the tube bundle 11, and the lower portion of the joint of the sliding plate 16 and the tube bundle 11 is movably connected with the fixing seat 17 through the mounting hole. The middle part of the other side of the sliding plate 16 is connected with the crankshaft 15, the crankshaft 15 drives the sliding plate 16 to move up and down, the height of the sliding plate 16 is changed, the height of the tube bundle 11 close to one end of the sliding plate 16 is further changed, different impact angles of atomized liquid drops on the tube bundle 11 can be obtained, and the impact angle can be calculated according to the cosine law. The slide plate 16 is made of a sheet steel plate.
In the above embodiments, the sliding plate 16 inserted into the mounting hole is provided with a scale, and the zero point of the scale is located at the connection position of the sliding plate 16 and the tube bundle 11.
In a preferred embodiment, the flow heat transfer test system includes a particle imaging velocimeter 18, a high speed camera 19 and a computer 20. The particle imaging velocimeter 18 and the high-speed camera 19 are both arranged at one side of the area between the nozzle 4 and the tube bundle 11, and the particle imaging velocimeter 18 transmits the measured wall-impacting speed and the measured atomized liquid drop particle size to the computer 20; the high-speed camera 19 transmits the captured state image information to the computer 20. In the experiment, the wall collision speed and the atomized particle size of atomized liquid drops can be measured by adjusting the height of the particle imaging velocimeter 18; the shooting area size and the shooting frequency can be changed by adjusting the number of shooting frames and pixels of the high-speed camera 19.
In the above embodiment, the imaging area of the high-speed camera 19 is the collision area of the atomized liquid droplets with the surface of the tube bundle 11. The state image information shot by the high-speed camera 19 is the phenomena of spreading, splashing, rebounding and the like after the atomized liquid drops contact with the surface of the tube bundle 11.
The above embodiments are only for illustrating the present invention, and the structure, size, arrangement position and shape of each component can be changed, and on the basis of the technical scheme of the present invention, the improvement and equivalent transformation of the individual components according to the principle of the present invention should not be excluded from the protection scope of the present invention.
Claims (4)
1. The utility model provides a wall experimental apparatus is hit in spraying suitable for ocean thermoelectric generation system falling film evaporation ware which characterized in that: the device comprises a spray droplet group generation system, a wall surface heating system, a wall surface control system and a flowing heat transfer test system; the spray droplet group generating system sprays the generated spray droplets to the wall surface heating system, the wall surface heating system is connected with the wall surface control system, and the flowing heat transfer testing system is used for collecting flowing parameters and heat transfer parameters of the wall surface heating system;
the spray droplet group generation system comprises a storage tank, a pipeline, a working medium pump and a nozzle; the output end of the storage tank is connected with the inlet of the working medium pump through the pipeline, and the outlet of the working medium pump is connected with the nozzle through the pipeline; the nozzle is positioned above the wall surface heating system; the nozzle is a pressure atomization nozzle;
the wall surface heating system comprises a heating device, a heating rod and a thermocouple; the heating device is of a T-shaped structure and is formed by welding a heating column and a tube bundle, and the tube bundle is connected with the wall surface control system; the heating rod is arranged on one side of the heating column, and the thermocouple is arranged on one side of the tube bundle; the nozzle is positioned above the tube bundle, and the arrangement position of the thermocouple on the tube bundle is positioned in the spraying range of the nozzle;
the wall surface control system comprises a base, a support, a sliding support and a crankshaft; the support is arranged at one end of the base, and the crankshaft is arranged at the other end of the base; the base close to one side of the crankshaft is also provided with the sliding support; one end of the tube bundle is placed on the support, and the other end of the tube bundle is connected to the sliding support; the sliding support is connected with the crankshaft;
the flowing heat transfer testing system comprises a particle imaging velocimeter, a high-speed camera and a computer; the particle imaging velocimeter transmits the measured wall collision speed and the measured atomized particle size of the atomized liquid drop to the computer; the high-speed camera transmits the shot state image information to the computer;
the sliding support comprises a sliding plate and a fixed seat; the fixed seat is fixed on the base, the fixed seat is provided with a mounting hole, one side of the sliding plate is connected with the tube bundle, and the lower part of the joint of the sliding plate and the tube bundle is movably connected with the fixed seat through the mounting hole; the middle part of the other side of the sliding plate is connected with the crankshaft.
2. The spray wall collision experiment device suitable for the falling film evaporator of the ocean temperature difference power generation system as claimed in claim 1, wherein: and a valve and a pressure gauge are arranged on the pipeline between the storage tank and the working medium pump.
3. The spray wall collision experiment device suitable for the falling film evaporator of the ocean temperature difference power generation system as claimed in claim 1, wherein: the heating device is characterized in that a plurality of blind holes are formed in the heating column at intervals, the heating rod is installed on the heating column through the blind holes, a plurality of insertion holes are formed in the tube bundle at intervals, and the thermocouple is inserted into the surface of the tube bundle from bottom to top through the insertion holes.
4. The spray wall collision experiment device suitable for the falling film evaporator of the ocean temperature difference power generation system as claimed in claim 1, wherein: the sliding plate is made of sheet steel plates, and scales are arranged on the sliding plate inserted in the mounting hole.
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| CN201710441534.1A CN107271335B (en) | 2017-06-13 | 2017-06-13 | Spray wall collision experimental device suitable for ocean thermoelectric power generation system falling film evaporator |
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| CN201710441534.1A CN107271335B (en) | 2017-06-13 | 2017-06-13 | Spray wall collision experimental device suitable for ocean thermoelectric power generation system falling film evaporator |
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| CN107271335B true CN107271335B (en) | 2020-03-03 |
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| CN111795793B (en) * | 2019-03-21 | 2022-05-13 | 西南科技大学 | Test device for collision of liquid drop and solid wall surface |
| CN111624011B (en) * | 2020-05-29 | 2021-02-26 | 浙江大学 | Spray coupling falling film cooling experiment system |
| CN111665170B (en) * | 2020-06-16 | 2023-02-07 | 中国石油大学(华东) | Liquid drop impact experimental device for quantitatively controlling deformation and tension of flexible substrate through ventilation |
Citations (4)
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| JP2008014880A (en) * | 2006-07-07 | 2008-01-24 | Kawasaki Heavy Ind Ltd | Liquid droplet impingement sensor and ice prevention device |
| CN104019991A (en) * | 2014-06-16 | 2014-09-03 | 西北工业大学 | Liquid drop and solid plate oblique collision testing device |
| CN104931230A (en) * | 2015-05-22 | 2015-09-23 | 中国科学技术大学 | Experimental device for researching law of change in the motion and collision process of droplets |
| CN106092506A (en) * | 2016-08-01 | 2016-11-09 | 西北工业大学 | High speed droplet/wall liquid film angular impact assay device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008014880A (en) * | 2006-07-07 | 2008-01-24 | Kawasaki Heavy Ind Ltd | Liquid droplet impingement sensor and ice prevention device |
| CN104019991A (en) * | 2014-06-16 | 2014-09-03 | 西北工业大学 | Liquid drop and solid plate oblique collision testing device |
| CN104931230A (en) * | 2015-05-22 | 2015-09-23 | 中国科学技术大学 | Experimental device for researching law of change in the motion and collision process of droplets |
| CN106092506A (en) * | 2016-08-01 | 2016-11-09 | 西北工业大学 | High speed droplet/wall liquid film angular impact assay device |
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