CN107057777B - Experimental device for inducing marangoni condensation by adopting interface fluctuation - Google Patents
Experimental device for inducing marangoni condensation by adopting interface fluctuation Download PDFInfo
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- CN107057777B CN107057777B CN201710118547.5A CN201710118547A CN107057777B CN 107057777 B CN107057777 B CN 107057777B CN 201710118547 A CN201710118547 A CN 201710118547A CN 107057777 B CN107057777 B CN 107057777B
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- venturi tube
- steam
- water inlet
- condensation
- marangoni
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- 230000005494 condensation Effects 0.000 title claims abstract description 32
- 238000009833 condensation Methods 0.000 title claims abstract description 32
- 230000001939 inductive effect Effects 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000000498 cooling water Substances 0.000 claims abstract description 8
- 239000007921 spray Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 abstract description 11
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000011280 coal tar Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/04—Purifying combustible gases containing carbon monoxide by cooling to condense non-gaseous materials
Abstract
The invention discloses an experimental device for inducing marangoni condensation by adopting interface fluctuation, which comprises a venturi tube, a steam generating device, a condensing device and a measuring instrument, wherein the steam generating device and the condensing device are connected with the venturi tube; the steam generating device is used for transmitting steam for the venturi tube, the condensing device is used for providing cooling water for the venturi tube, and the measuring instrument is arranged outside the venturi tube and used for recording pressure and flow of the venturi tube. The steam generating device can provide hot steam for the venturi tube, the condensing device can generate downstream cooling water, and the hot steam is in contact with the generated downstream water column for condensation. Because vacuum suction is generated in the venturi tube, a pressure drop gradient exists, the condensation temperature of steam is changed, liquid drops are fluctuated, the marangoni condensation is induced by the surface tension gradient and interface fluctuation, and the condensation is strengthened. The device has the advantages of ingenious structure, simplicity, compactness, less power required, energy conservation, environmental protection and low cost.
Description
Technical Field
The invention belongs to the technical field of condenser experiments, and relates to an experimental device for inducing marangoni condensation by adopting interface fluctuation.
Background
The venturi tower is the main equipment for condensing and recycling coal tar from raw gas, and energy conservation is particularly important. The steam condensation rate in the existing Venturi tower is only 60-80%, and a rotational flow plate tower needs to be added to increase the steam condensation rate, so that the equipment cost is increased.
The Marangoni Effect (Marangoni Effect) is that when a liquid film of a liquid is locally thinned due to external disturbance (such as temperature and concentration), a Marangoni flow is formed under the action of a surface tension gradient, so that the liquid flows back to the thin liquid surface along an optimal path to be repaired. Although, prior studies have mostly used binary zeotropic mixed steam of water and alcohol to produce marangoni condensation on the surface of the liquid film. However, in the venturi tube, if the structural parameters of the venturi tube are adjusted, a larger pressure drop gradient is obtained, so that the condensation temperature of the surface of the liquid film is changed, and the tension gradient of the surface of the liquid film is also changed, thereby inducing marangoni condensation, and realizing condensation heat exchange enhancement and energy saving of the venturi tower.
Disclosure of Invention
The invention aims to provide an experimental device for inducing marangoni condensation by adopting interface fluctuation, which has reasonable structural design and convenient use and can solve the problem of lower condensation efficiency of the existing Venturi tower.
The invention is realized by the following technical scheme:
the invention discloses an experimental device for inducing marangoni condensation by adopting interface fluctuation, which comprises a venturi tube, a steam generating device, a condensing device and a measuring instrument, wherein the steam generating device and the condensing device are connected with the venturi tube; the steam generating device is used for transmitting steam for the venturi tube, the condensing device is used for providing cooling water for the venturi tube, and the measuring instrument is arranged outside the venturi tube and used for recording pressure and flow of the venturi tube.
Preferably, the steam generating device comprises an evaporator and a booster pump, the booster pump is connected with the evaporator through a water inlet pipe, the evaporator is connected with a venturi tube through a steam pipe, and a heating rod is further arranged in the evaporator.
The water inlet pipe is provided with a water inlet valve, and the steam pipe is provided with a steam valve.
A first flowmeter is arranged on the steam pipe line between the steam valve and the venturi tube.
Preferably, the condensing device consists of a circulating pump, a condensed water inlet pipe and a spray head, wherein one end of the condensed water inlet pipe is connected with the circulating pump, and the other end of the condensed water inlet pipe extends into the venturi tube; the spray head is arranged on a condensed water inlet pipe extending into the venturi tube; and a condensed water inlet valve is also arranged on the cold condensed water inlet pipe.
A second flowmeter is also arranged between the condensed water inlet valve and the circulating pump.
Preferably, the measuring instrument comprises a plurality of pressure gauges arranged on one side of the venturi tube and a third flowmeter arranged on the other side of the venturi tube, wherein the plurality of pressure gauges are sequentially arranged along the height direction of the venturi tube, and the third flowmeter is arranged on a water outlet pipe connected with the venturi tube.
Further preferably, a first pressure gauge, a second pressure gauge, a third pressure gauge, a fourth pressure gauge and a fifth pressure gauge are installed on one side of the venturi tube from top to bottom in sequence.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses an experimental device for inducing marangoni condensation by adopting interface fluctuation, which comprises a venturi tube, a steam generating device, a condensing device and a measuring instrument. The steam generating device can provide hot steam for the venturi tube, the condensing device can generate downstream cooling water, and the hot steam is in contact with the generated downstream water column for condensation. Because vacuum suction is generated in the venturi tube, a pressure drop gradient exists, the condensation temperature of steam is changed, liquid drops are fluctuated, the marangoni condensation is induced by the surface tension gradient and interface fluctuation, and the condensation is strengthened. The device has the advantages of ingenious structure, simplicity, compactness, less power required, energy conservation, environmental protection and low cost.
Drawings
FIG. 1 is a schematic diagram of an experimental apparatus for inducing marangoni coagulation using interfacial fluctuations according to the present invention.
Wherein: 1 booster pump, 2 inlet tube, 3 inlet valve, 4 evaporimeter, 5 heating rod, 6 steam pipe, 7 steam valve, 8 first flowmeter, 9 comdenstion water inlet valve, 10 second flowmeter, 11 circulating pump, 12 third flowmeter, 13 outlet pipe, 14 fifth manometer, 15 fourth manometer, 16 third manometer, 17 second manometer, 18 first manometer, 19 venturi, 20 comdenstion water inlet tube, 21 shower nozzle.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
example 1
Referring to fig. 1, the experimental device for inducing marangoni condensation by adopting interface fluctuation disclosed by the invention comprises a venturi tube 19, a steam generating device, a condensing device and a measuring instrument, wherein the steam generating device and the condensing device are connected with the venturi tube 19; the steam generating device is used for transmitting steam for the venturi tube 19, the condensing device is used for providing cooling water for the venturi tube 19, and the measuring instrument is arranged outside the venturi tube 19 and used for recording the pressure and flow of the venturi tube 19.
The steam generating device comprises an evaporator 4 and a booster pump 1, wherein the booster pump 1 is connected with the evaporator 4 through a water inlet pipe 2, the evaporator 4 is connected with a venturi tube 19 through a steam pipe 6, and a heating rod 5 is further arranged in the evaporator 4. The water inlet pipe 2 is provided with a water inlet valve 3, and the steam pipe 6 is provided with a steam valve 7. A first flowmeter 8 is provided in the steam pipe line between the steam valve 7 and the venturi 19.
The condensing device consists of a circulating pump 11, a condensed water inlet pipe 20 and a spray head 21, wherein one end of the condensed water inlet pipe 20 is connected with the circulating pump 11, and the other end of the condensed water inlet pipe extends into the venturi tube 19; the spray head 21 is arranged on a condensate water inlet pipe 20 extending into the venturi tube 19; the condensed water inlet pipe 20 is also provided with a condensed water inlet valve 9. A second flowmeter 10 is also provided between the condensate water inlet valve 9 and the circulation pump 11.
The measuring instrument comprises a plurality of pressure gauges arranged on one side of the venturi tube 19 and a third flowmeter 12 arranged on the other side of the venturi tube 19, wherein the pressure gauges are sequentially arranged along the height direction of the venturi tube 19, and the third flowmeter 12 is arranged on a water outlet pipe 13 connected with the venturi tube 19. A first pressure gauge 18, a second pressure gauge 17, a third pressure gauge 16, a fourth pressure gauge 15 and a fifth pressure gauge 14 are installed on one side of the venturi tube 19 from top to bottom along the constriction section and the throat section.
Example 2
The booster pump 1 is connected with one end of a water inlet pipe 2, the other end of the water inlet pipe 2 is connected with an evaporator 4, and a water inlet valve 3 is arranged on the water inlet pipe 2. A heating rod 5 is installed inside the evaporator 4. One end of the steam pipe 6 is installed at the upper portion of the evaporator 4, and the other end of the steam pipe 6 is installed at the upper portion of the venturi tube 19. A steam valve 7 and a first flowmeter 8 are respectively mounted on the steam pipe 6. A first pressure gauge 18, a second pressure gauge 17, a third pressure gauge 16, a fourth pressure gauge 15 and a fifth pressure gauge 14 are installed in this order from top to bottom on the left side of the venturi tube 19. A condensate water inlet pipe 20 and a water outlet pipe 13 are installed at the right side of the venturi tube 19. The condensate water inlet pipe 20 is provided with a circulating pump 11, a second flowmeter 10 and a condensate water inlet valve 9 at one end extending into the environment. The other end of the condensate water inlet pipe 20 extending inside the venturi tube 19 is provided with a spray head 21. A third flowmeter 12 is mounted on the outlet pipe 13.
The experimental device for inducing marangoni condensation by adopting interface fluctuation provided by the invention is used for:
the inlet valve 3 is opened and the booster pump 1 is used to add water to the evaporator 4 to a 2/3 liquid level. The water inlet valve 3 is closed, and the heating rod 5 is opened to electrify and heat the water in the evaporator 4. The steam flows along the steam pipe 6 into the venturi 19. At the same time, the circulation pump 11 is turned on, cooling water is introduced into the condensate water inlet pipe 20, and they flow into the venturi tube 19 through the shower head 21. When the downflowing water column contacts steam, the surface temperature of the water column is lower than the saturation temperature of the steam, and the steam condenses on the surface of the water column. Due to the pressure drop gradient in the venturi 19 in the constriction and throat section, condensation of the steam in contact with the downflowing water column in the pressure swing field occurs. The pressure drop gradient causes the vapor condensation temperature to change, and the surface tension of the liquid drops is changed, so that interface fluctuation occurs, and the Marangoni condensation is induced. Steam condensation can be promoted, and a Marangoni condensation effect can be obtained according to the flow values of the three flow meters. Varying the steam flow, cooling water flow, nozzle geometry and venturi configuration parameters can investigate various influencing factors that influence Marangoni condensation.
Claims (2)
1. The experimental device for inducing marangoni condensation by adopting interface fluctuation is characterized by comprising a venturi tube (19), a steam generating device, a condensing device and a measuring instrument, wherein the steam generating device and the condensing device are connected with the venturi tube (19); the steam generating device is used for transmitting steam for the venturi tube (19), the condensing device is used for providing cooling water for the venturi tube (19), and the measuring instrument is arranged outside the venturi tube (19) and used for recording the pressure and flow of the venturi tube (19);
the steam generating device comprises an evaporator (4) and a booster pump (1), wherein the booster pump (1) is connected with the evaporator (4) through a water inlet pipe (2), the evaporator (4) is connected with a venturi tube (19) through a steam pipe (6), and a heating rod (5) is further arranged in the evaporator (4);
a water inlet valve (3) is arranged on the water inlet pipe (2), a steam valve (7) is arranged on the steam pipe (6), and a first flowmeter (8) is arranged on a steam pipe pipeline between the steam valve (7) and the venturi tube (19);
the condensing device consists of a circulating pump (11), a condensed water inlet pipe (20) and a spray head (21), wherein one end of the condensed water inlet pipe (20) is connected with the circulating pump (11), and the other end of the condensed water inlet pipe extends into the venturi tube (19); the spray head (21) is arranged on a condensed water inlet pipe (20) extending into the venturi tube (19); a condensed water inlet valve (9) is further arranged on the condensed water inlet pipe (20), and a second flowmeter (10) is further arranged between the condensed water inlet valve (9) and the circulating pump (11);
the measuring instrument comprises a plurality of pressure gauges arranged on one side of the venturi tube (19) and a third flowmeter (12) arranged on the other side of the venturi tube (19), wherein the pressure gauges are sequentially arranged in the height direction of the venturi tube (19), and the third flowmeter (12) is arranged on a water outlet pipe (13) connected with the venturi tube (19).
2. The experimental device for inducing marangoni condensation using interfacial fluctuation according to claim 1, wherein a first pressure gauge (18), a second pressure gauge (17), a third pressure gauge (16), a fourth pressure gauge (15) and a fifth pressure gauge (14) are installed in this order from top to bottom on one side of the venturi tube (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710118547.5A CN107057777B (en) | 2017-03-01 | 2017-03-01 | Experimental device for inducing marangoni condensation by adopting interface fluctuation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710118547.5A CN107057777B (en) | 2017-03-01 | 2017-03-01 | Experimental device for inducing marangoni condensation by adopting interface fluctuation |
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| CN107057777A CN107057777A (en) | 2017-08-18 |
| CN107057777B true CN107057777B (en) | 2023-11-28 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB791652A (en) * | 1954-10-20 | 1958-03-05 | Robert James Swinton Smith | Improvements in or relating to vapour condensing apparatus |
| GB1299921A (en) * | 1969-01-31 | 1972-12-13 | Baltimore Aircoil Co Inc | Evaporative heat exchangers |
| JPH01134180A (en) * | 1987-11-18 | 1989-05-26 | Hitachi Cable Ltd | Heat transfer tube for absorber |
| SU1669510A1 (en) * | 1989-03-23 | 1991-08-15 | Ровенское Производственное Объединение "Азот" Им.50-Летия Ссср | Scrubber for treating gases with liquid |
| US6109293A (en) * | 1996-04-24 | 2000-08-29 | Big Horn Valve, Inc. | Split venturi, axially-rotated valve |
| CN1278894A (en) * | 1997-09-08 | 2001-01-03 | 比格豪恩阀门公司 | An Improved flow axially-rotated, split venturi valve |
| CN104502176A (en) * | 2014-12-17 | 2015-04-08 | 榆林学院 | Gas mixing device for condensation and heat exchange of steam containing non-condensable gas |
| CN105004638A (en) * | 2014-04-24 | 2015-10-28 | 西北工业大学 | Speed-accurately controlled transparent solution phase-separation observation apparatus |
| CN205979183U (en) * | 2016-07-22 | 2017-02-22 | 天津市川宏仪表系统科技有限公司 | Integral type interface control's superheated steam temperature and pressure reduction device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2412301A (en) * | 1999-12-23 | 2001-07-09 | Ide Til Produkt As | Method, apparatus and system for the condensation of vapours and gases |
| NO312484B1 (en) * | 2000-07-26 | 2002-05-13 | Venturie As | Gasskondensator |
-
2017
- 2017-03-01 CN CN201710118547.5A patent/CN107057777B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB791652A (en) * | 1954-10-20 | 1958-03-05 | Robert James Swinton Smith | Improvements in or relating to vapour condensing apparatus |
| GB1299921A (en) * | 1969-01-31 | 1972-12-13 | Baltimore Aircoil Co Inc | Evaporative heat exchangers |
| JPH01134180A (en) * | 1987-11-18 | 1989-05-26 | Hitachi Cable Ltd | Heat transfer tube for absorber |
| SU1669510A1 (en) * | 1989-03-23 | 1991-08-15 | Ровенское Производственное Объединение "Азот" Им.50-Летия Ссср | Scrubber for treating gases with liquid |
| US6109293A (en) * | 1996-04-24 | 2000-08-29 | Big Horn Valve, Inc. | Split venturi, axially-rotated valve |
| CN1278894A (en) * | 1997-09-08 | 2001-01-03 | 比格豪恩阀门公司 | An Improved flow axially-rotated, split venturi valve |
| CN105004638A (en) * | 2014-04-24 | 2015-10-28 | 西北工业大学 | Speed-accurately controlled transparent solution phase-separation observation apparatus |
| CN104502176A (en) * | 2014-12-17 | 2015-04-08 | 榆林学院 | Gas mixing device for condensation and heat exchange of steam containing non-condensable gas |
| CN205979183U (en) * | 2016-07-22 | 2017-02-22 | 天津市川宏仪表系统科技有限公司 | Integral type interface control's superheated steam temperature and pressure reduction device |
Non-Patent Citations (12)
| Title |
|---|
| Jacobs H R..nffiEC-CONTACT CONDENSATION.《Direct contact heat transfer》.Springer,1988,第223-235页. * |
| Local condensation rates of steam-air mixtures in direct contact with a falling liquid film;T. D. KARAPANTSIOS et al;《Int. Z Heat Mass Transfer. 》;19951231;第38卷(第5期);第779-794页 * |
| 含不凝气体的蒸汽直接接触冷凝换热研究综述;张俊霞;《冶金能源》;20160731;第35卷(第04期);第17页摘要，前言，第17-18页第1节，第18页图1，第20-21页第3节 * |
| 文丘里管内气液两相环状流传热及流动特性研究;田茂诚等;《东南大学学报(自然科学版)》;19981130;第28卷;第12-17页 * |
| 李杨 ; 乔磊 ; 严俊杰 ; 胡申华 ; .蒸汽流速对竖直管外Marangoni凝结换热特性影响的实验研究.工程热物理学报.2008,(第05期),全文. * |
| 杨豫森 ; 武心壮 ; 严俊杰 ; 刘继平 ; .流速对混合蒸汽Marangoni凝结换热影响的实验研究.工程热物理学报.2007,(第06期),全文. * |
| 杨豫森 ; 甄克建 ; 严俊杰 ; 刘继平 ; .蒸汽压力对Marangoni凝结换热特性的影响.工程热物理学报.2006,(第06期),全文. * |
| 流速对混合蒸汽Marangoni凝结换热影响的实验研究;杨豫森;武心壮;严俊杰;刘继平;;工程热物理学报(第06期);全文 * |
| 窄通道中过冷沸腾汽-液界面凝结换热系数;袁德文;潘良明;陈德奇;王小军;;核动力工程(第05期);全文 * |
| 蒸汽压力对Marangoni凝结换热特性的影响;杨豫森;甄克建;严俊杰;刘继平;;工程热物理学报(第06期);全文 * |
| 蒸汽流速对竖直管外Marangoni凝结换热特性影响的实验研究;李杨;乔磊;严俊杰;胡申华;;工程热物理学报(第05期);全文 * |
| 袁德文 ; 潘良明 ; 陈德奇 ; 王小军 ; .窄通道中过冷沸腾汽-液界面凝结换热系数.核动力工程.2009,(第05期),全文. * |
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Effective date of registration: 20231024 Address after: Room 11-1022, 10th Floor, Business Building 11 #, Junhao Shijia, No. 25 Baishuitang Road, Xiuying District, Haikou City, Hainan Province, 570311 Applicant after: Haikou Totem New Energy Application Research and Development Co.,Ltd. Address before: No. 2, cultural North Road, Yulin, Shaanxi Province, Shaanxi Applicant before: YULIN University |
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