CN110285607A - Horizontal impact type falling film evaporator and method - Google Patents
Horizontal impact type falling film evaporator and method Download PDFInfo
- Publication number
- CN110285607A CN110285607A CN201910433496.4A CN201910433496A CN110285607A CN 110285607 A CN110285607 A CN 110285607A CN 201910433496 A CN201910433496 A CN 201910433496A CN 110285607 A CN110285607 A CN 110285607A
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- Prior art keywords
- evaporation tube
- shell
- fin
- falling film
- film evaporator
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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
- F25B39/00—Evaporators; Condensers
- F25B39/04—Condensers
-
- 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
- F25B2339/00—Details of evaporators; Details of condensers
- F25B2339/02—Details of evaporators
- F25B2339/021—Evaporators in which refrigerant is sprayed on a surface to be cooled
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a kind of horizontal impact type falling film evaporator and methods, belong to evaporation technique field.The evaporator mainly includes exhaust passage, evaporation tube, shell and liquid distributor, it is characterised in that: above-mentioned shell is provided with steam (vapor) outlet at the top of it and coolant inlet, bottom are provided with refrigerant outlet；Above-mentioned liquid distributor bottom is equipped with nozzle；The outer wall of above-mentioned first row evaporation tube is disposed with fin；Fluid apertures is provided on fin；A kind of horizontal impact type falling film evaporator proposed by the invention, effluxvelocity is improved by installing nozzle in liquid distributor bottom, and then improves heat exchange rate, and slows down impact jet flow in first row evaporation pipe outer wall arrangement fin, so that refrigerant is sufficiently exchanged heat between evaporation tube, increases heat exchange amount.Under the action of impinging cooling, the heat exchange efficiency of whole falling film evaporator is improved.Present apparatus structure novel, heat exchange rate are fast.
Description
Technical field
The present invention relates to a kind of horizontal impact type falling film evaporator and methods, belong to evaporation technique field.
Background technique
Falling film evaporator is a kind of New Evaporator, few with refrigerant charge, equipment volume is small, oil return performance is good
The advantages that, it is widely used in the systems such as refrigeration air-conditioner, compressor set.Since the heat transfer mechanism of falling film evaporator is extremely complex,
Its heat transfer coefficient is influenced by many factors such as refrigerant category, operating condition, evaporation tube parameter, surface flow forms.Wherein
The limiting factor of operating condition is more, since refrigerant requires flow velocity cannot be excessive when exchanging heat with substance in evaporation tube, to mention
The time of contact of high cold fluid and hot fluid, and then increase heat exchange amount.But it is slow that flow velocity will lead to heat transfer rate again slowly excessively, to limit
Heat exchange efficiency when refrigerant flows between evaporation tube, eventually leads to the problems such as falling film evaporator overall heat exchange efficiency is low.
Summary of the invention
The problems such as present invention is low for existing falling film evaporator heat exchange efficiency proposes a kind of horizontal impact type falling film evaporation
Device and method, it is this evaporator connection and reasonable arrangement, good effect of heat exchange, stable.
A kind of horizontal impact type falling film evaporator, including exhaust passage, evaporation tube, shell and liquid distributor, feature exist
In: above-mentioned shell is in horizontally disposed cylindrical shape；Middle and upper part inside housings, is horizontally disposed with liquid distributor, and liquid distributor bottom is equal
Even to be disposed with nozzle, there are exhaust passages between liquid distributor both ends and inner walls；Middle part and lower part inside housings, it is horizontal
Evaporation tube array is set, and wherein the arrangement mode of the evaporation tube in evaporation tube array is fork row or in-line arrangement mode；Above-mentioned shell top
Portion's midline position offers steam (vapor) outlet, and the refrigerant inlet communicated in the middle part of liquid distributor is additionally provided among steam (vapor) outlet,
Housing bottom midline position offers refrigerant outlet；Row's evaporation tube in above-mentioned evaporation tube array near liquid distributor is known as
First row evaporation tube；Each evaporation tube of first row evaporation tube and corresponding nozzle are corresponding, are exactly in corresponding nozzle
Underface；The outer wall of above-mentioned first row evaporation tube is equipped with fin, and fin is arranged symmetrically centered on corresponding nozzle；And in fin
On open up fluid apertures since the side contacted with evaporation tube.
The working method of the horizontal impact type falling film evaporator, it is characterised in that including the following course of work: refrigeration
Agent passes through refrigerant inlet first and enters liquid distributor, then evaporates pipe outer wall, the jet stream after impact by jet impact first row
Fin is flowed to, by flowing out after fin reduction of speed from fluid apertures, flows to next row in shaped liquid film then along fin and evaporation pipe outer wall
Evaporation tube；For the stability for improving evaporator operation, it should be full of refrigerant in 1/3 region of housing bottom；In impact falling liquid film
Evaporator, unevaporated refrigeration is discharged from the steam (vapor) outlet of case top by exhaust passage in the refrigerant evaporated in heat transfer process
Evaporator is discharged from the refrigerant outlet of housing bottom in agent.
The beneficial effects of the present invention are: a kind of horizontal impact type falling film evaporator proposed by the invention, structure novel,
Heat exchange rate is fast.Effluxvelocity is improved by installing nozzle in liquid distributor bottom, and then improves the heat exchange of first row evaporation tube
Rate and efficiency, and slow down impact jet flow in first row evaporation pipe outer wall arrangement fin, change refrigerant sufficiently between evaporation tube
Heat promotes the heat exchange efficiency of rear evaporator pipe.Under the action of impinging cooling, the heat exchange efficiency of whole falling film evaporator is mentioned
It is high.
A kind of horizontal impact type falling film evaporator, it is characterised in that: the arrangement mode for the fluid apertures arranged on fin
To pitch row's mode, is conducive to impact jet flow reduction of speed in this way and successfully forms preferable liquid film in tube wall.
A kind of horizontal impact type falling film evaporator, it is characterised in that: to make to impact penetrating for first row evaporation tube
Reduction of speed is flowed, and then forms preferable liquid film in tube wall lower end, fin opens up angleaIt should be 45 ° -70 °；Open up angle too small then
It is excessive to will lead to the coolant flow speed that next row evaporation tube is flowed to by fluid apertures, exchanges heat insufficient；It is excessive to open up angle, can lead
Coolant residence time on fin too long formation packing phenomenon is caused, and then influences further changing for coolant and lower row's evaporation tube
Hot property.
A kind of horizontal impact type falling film evaporator, it is characterised in that: according to nozzle, stream distance and refrigerant
Difference, to achieve the effect that impinging cooling, the jet stream Reynolds number of nozzle should be controlled 2.1 × 105-2.1×106；Reynolds number mistake
It is small that effect required by impinging cooling is not achieved；Reynolds number it is excessive not only can to fin arrangement it is more difficult, can also make to the
The impact force of one row's evaporation tube sharply increases, and then seriously affects heat exchange property.
A kind of horizontal impact type falling film evaporator, it is characterised in that: falling film evaporator uses 5 layers of AND DEWATERING FOR ORIFICE STRUCTURE
Liquid distributor can not only save gas-liquid separation equipment, but also can achieve preferable cloth fluidity energy.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention；
Fig. 2 is the schematic cross-section of fin；
Fig. 3 is the impact effect schematic diagram of nozzle and fin
Figure label title: 1. steam (vapor) outlets, 2. refrigerant inlets, 3. exhaust passages, 4. evaporation tubes, 5. refrigerant outlets, 6.
Shell, 7. fins, 8. nozzles, 9. liquid distributors, 10. fluid apertures.
Specific implementation method
In order to make those skilled in the art more fully understand technical solution of the present invention, 1, Fig. 2 and Fig. 3 pairs with reference to the accompanying drawing
The present invention is described in further detail.
Refrigerant passes through refrigerant inlet 2 first and enters liquid distributor 9, is then impacted outside first row evaporation tube 4 by nozzle 8
Wall, the jet stream after impact flow to fin 7, by after 7 reduction of speed of fin from fluid apertures 10 flow out, then along fin 7 and evaporation tube 4 outside
Wall flows to next row evaporation tube 4 in shaped liquid film；For the stability for improving evaporator operation, it should in 6 bottom of shell, 1/3 region
Full of refrigerant, to reduce since bottom coohng agent temperature decrease causes unstable influence to evaporation and heat-exchange；In impact falling liquid film
Evaporator is discharged from the steam (vapor) outlet 1 at 6 top of shell by exhaust passage 3 in the refrigerant evaporated in heat transfer process, unevaporated
Evaporator is discharged from the refrigerant outlet 5 of 6 bottom of shell in refrigerant.
The present invention can realize the year-on-year scaling of geometry according to different refrigerant requirements to nozzle and fin.The above institute
Stating is only implementation example of the invention, it is noted that those of ordinary skill in the art, is not departing from skill of the present invention
The improvement and deformation made on the basis of art principle still falls within protection scope of the present invention.
Claims (6)
1. a kind of horizontal impact type falling film evaporator, including exhaust passage (3), evaporation tube (4), shell (6) and liquid distributor
(9), it is characterised in that:
Above-mentioned shell (6) is in horizontally disposed cylindrical shape；
In the internal middle and upper part of shell (6), it is horizontally disposed with liquid distributor (9), liquid distributor (9) bottom has been evenly arranged nozzle (8), cloth
There are exhaust passage (3) between liquid device (9) both ends and shell (6) inner wall；
At shell (6) internal middle part and lower part, it is horizontally disposed with evaporation tube array, wherein the evaporation tube (4) in evaporation tube array
Arrangement mode be fork row or in-line arrangement mode；
Midline position offers steam (vapor) outlet (1) at the top of above-mentioned shell (6), is additionally provided with and cloth liquid among steam (vapor) outlet (1)
The refrigerant inlet (2) communicated in the middle part of device (9), shell (6) bottom midline position offer refrigerant outlet (5)；
Row's evaporation tube in above-mentioned evaporation tube array near liquid distributor (9) is known as first row evaporation tube (4)；First row evaporation
Each evaporation tube and the corresponding nozzle for managing (4) are corresponding, are exactly in the underface of corresponding nozzle；
The outer wall of above-mentioned first row evaporation tube (4) is equipped with fin (7), and fin (7) is in symmetrical cloth centered on corresponding nozzle (8)
It sets；And fluid apertures (10) are opened up since the side contacted with evaporation tube (4) on fin (7).
2. horizontal impact type falling film evaporator according to claim 1, it is characterised in that: the arrangement side of above-mentioned fluid apertures (10)
Formula is fork row's mode.
3. horizontal impact type falling film evaporator according to claim 1, it is characterised in that: above-mentioned fin (7) opens up angle
DegreeaIt is 45 ° -70 °.
4. horizontal impact type falling film evaporator according to claim 1, it is characterised in that: the jet stream thunder of said nozzle (8)
Promise number is 2.1 × 105-2.1×106。
5. horizontal impact type falling film evaporator according to claim 1, it is characterised in that: above-mentioned liquid distributor (9) is 5 layers of hole
Hardened structure.
6. the working method of horizontal impact type falling film evaporator according to claim 1, which is characterized in that including following work
Make process:
Refrigerant passes through refrigerant inlet (2) into liquid distributor (9) first, then impacts first row evaporation tube by nozzle (8)
(4) outer wall, the jet stream after impact flow to fin (7), by flowing out after fin (7) reduction of speed from fluid apertures (10), then along fin
(7) and evaporation tube (4) outer wall is in that shaped liquid film flows to next row evaporation tube (4)；For the stability for improving evaporator operation, it should
Refrigerant is full of in 1/3 region of shell (6) bottom, to reduce since bottom coohng agent temperature decrease causes shakiness to evaporation and heat-exchange
Fixed influence；The refrigerant evaporated during impacting Falling film heat transfer is gone out by exhaust passage (3) from the steam at the top of shell (6)
Evaporator is discharged in mouth (1), and evaporator is discharged from the refrigerant outlet (5) of shell (6) bottom in unevaporated refrigerant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910433496.4A CN110285607B (en) | 2019-05-23 | 2019-05-23 | Horizontal impact falling-film evaporator and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910433496.4A CN110285607B (en) | 2019-05-23 | 2019-05-23 | Horizontal impact falling-film evaporator and method |
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| Publication Number | Publication Date |
|---|---|
| CN110285607A true CN110285607A (en) | 2019-09-27 |
| CN110285607B CN110285607B (en) | 2021-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910433496.4A Active CN110285607B (en) | 2019-05-23 | 2019-05-23 | Horizontal impact falling-film evaporator and method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10220914A (en) * | 1997-02-07 | 1998-08-21 | Osaka Gas Co Ltd | Plate type evaporator and absorbing device of absorbing type freezer |
| JP2000304377A (en) * | 1999-04-23 | 2000-11-02 | Daikin Ind Ltd | Absorber for water-cooled absorption refrigerating device |
| CN104457040A (en) * | 2014-11-13 | 2015-03-25 | 广东申菱空调设备有限公司 | Spray-type falling film evaporator and liquid level control method thereof |
| CN205425941U (en) * | 2016-04-01 | 2016-08-03 | 山东绿特空调***有限公司 | Liquid distributor of horizontal falling film evaporation ware |
| CN106123400A (en) * | 2016-07-06 | 2016-11-16 | 杭州赛富特设备有限公司 | A kind of falling film type evaporation device of band gravity separatory |
-
2019
- 2019-05-23 CN CN201910433496.4A patent/CN110285607B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10220914A (en) * | 1997-02-07 | 1998-08-21 | Osaka Gas Co Ltd | Plate type evaporator and absorbing device of absorbing type freezer |
| JP2000304377A (en) * | 1999-04-23 | 2000-11-02 | Daikin Ind Ltd | Absorber for water-cooled absorption refrigerating device |
| CN104457040A (en) * | 2014-11-13 | 2015-03-25 | 广东申菱空调设备有限公司 | Spray-type falling film evaporator and liquid level control method thereof |
| CN205425941U (en) * | 2016-04-01 | 2016-08-03 | 山东绿特空调***有限公司 | Liquid distributor of horizontal falling film evaporation ware |
| CN106123400A (en) * | 2016-07-06 | 2016-11-16 | 杭州赛富特设备有限公司 | A kind of falling film type evaporation device of band gravity separatory |
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| Publication number | Publication date |
|---|---|
| CN110285607B (en) | 2021-06-22 |
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