CN115523772A - Flow equalizing and liquid distributing device and falling film evaporator - Google Patents
Flow equalizing and liquid distributing device and falling film evaporator Download PDFInfo
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- CN115523772A CN115523772A CN202211120970.6A CN202211120970A CN115523772A CN 115523772 A CN115523772 A CN 115523772A CN 202211120970 A CN202211120970 A CN 202211120970A CN 115523772 A CN115523772 A CN 115523772A
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- 239000007788 liquid Substances 0.000 title claims abstract description 87
- 239000011552 falling film Substances 0.000 title claims abstract description 22
- 238000009826 distribution Methods 0.000 claims abstract description 57
- 239000010408 film Substances 0.000 claims abstract description 15
- 239000012530 fluid Substances 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 4
- 230000002265 prevention Effects 0.000 claims description 3
- 239000003507 refrigerant Substances 0.000 abstract description 55
- 238000005457 optimization Methods 0.000 description 12
- 238000005057 refrigeration Methods 0.000 description 5
- 239000000306 component Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D5/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, using the cooling effect of natural or forced evaporation
- F28D5/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, using the cooling effect of natural or forced evaporation in which the evaporating medium flows in a continuous film or trickles freely over the conduits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention provides a liquid flow equalizing and distributing device and a falling film evaporator. This flow equalizing and liquid distributing device, including the subassembly that flow equalizes, the subassembly that flow equalizes includes first flow channel, install a plurality of baffling boards in the first flow channel, it is a plurality of the baffling board along first flow channel is relative, and interval arrangement for falling liquid film evaporator possesses excellent refrigerant distribution ability, can evenly distribute the refrigerant, in order to reach high-efficient cryogenic purpose.
Description
Technical Field
The invention relates to the technical field of evaporators, in particular to a liquid flow equalizing and distributing device and a falling film evaporator.
Background
The shell and tube evaporator, one of the core components of a commercial chiller, is critical to the performance of the unit. Currently, the commonly used shell-and-tube evaporators are classified into flooded type and falling film type. The former is to carry out pool boiling heat exchange by soaking the heat exchange tube in a liquid refrigerant, while the latter is to carry out evaporation heat exchange by utilizing the liquid refrigerant dripped on the outer surface of the heat exchange tube row by row, and the heat exchange device has two heat exchange modes of nucleate boiling and convection heat exchange. Due to different heat exchange mechanisms, the structure and performance of the falling film evaporator are different, and the falling film evaporator gradually becomes a research focus by virtue of the advantages of high heat exchange efficiency, high evaporation temperature, low refrigerant filling amount and the like.
For the falling film evaporator, the specific working principle is as follows: the gas-liquid mixed refrigerant passing through the throttling device enters the evaporator from the inlet connecting pipe, then the liquid refrigerant is uniformly dripped on the outer surface of the heat exchange tube through the liquid distribution device, a liquid film is formed from top to bottom to exchange heat with fluid in the tube, a small amount of liquid refrigerant which is not consumed in the heat exchange process is accumulated at the bottom of the tube body to form a liquid pool, the liquid pool is evaporated and exchanged with the fluid in the heat exchange tube at the position, and the refrigerant is fully utilized to achieve the purpose of efficient refrigeration. In the above process, whether the liquid refrigerant can be uniformly distributed is a key factor influencing the heat exchange performance of the evaporator.
The existing commonly used liquid distribution device mainly adopts a plurality of layers of pore plates, and the flow is gradually equalized until the refrigerant is distributed on the outer surface of the heat exchange tube. Because the refrigerant velocity of flow that gets into the evaporimeter from the entry takeover is too high for there is the impaired risk of orifice plate in current cloth liquid device, and under the continuous striking of high-speed refrigerant, certain degree deformation and rocking can appear in the cloth liquid device. Meanwhile, gaseous refrigerants cannot be discharged in time, and the flow equalization process of liquid refrigerants is seriously disturbed.
Therefore, a new liquid distribution device is required to be designed to have excellent refrigerant distribution capacity.
Disclosure of Invention
In order to solve the above problems, the present invention provides a liquid-equalizing and distributing device and a falling film evaporator, which have excellent refrigerant-distributing capacity.
The invention discloses a liquid flow equalizing and distributing device which comprises a flow equalizing assembly, wherein the flow equalizing assembly comprises a first flow channel, a plurality of baffle plates are arranged in the first flow channel, and the baffle plates are opposite along the first flow channel and are arranged at intervals.
As further optimization of the invention, the membrane distribution device also comprises a membrane distribution assembly communicated with the flow equalizing assembly, wherein the membrane distribution assembly comprises a cavity, and a first layer of liquid distribution plate and a second layer of liquid distribution plate are arranged in the cavity.
As a further optimization of the present invention, the flow equalizing assembly further includes a second flow channel, and the second flow channel is disposed around the periphery of the first flow channel and is respectively communicated with the first flow channel and the cavity.
As a further optimization of the present invention, the first flow channel is composed of a side plate, a bottom plate and a top cover, and the second flow channel is composed of a side plate, a bottom plate and a side cover; the side plates comprise a first side plate and a second side plate, and the first side plate and the second side plate are tightly connected.
As a further optimization of the invention, the top cover is provided with a second caliber, and the second caliber is provided with a gas-liquid filter screen.
As a further optimization of the invention, an anti-impact platform is further installed in the first flow channel, and the height of the anti-impact platform is greater than that of the baffle plate.
As a further optimization of the present invention, a first caliber communicated with the second flow channel is provided on the oppositely disposed second side plate away from the impact prevention table.
As a further optimization of the invention, the sum L1+ L2 of the lengths of two adjacent baffles is greater than the length L3 of the second side plate.
As a further optimization of the invention, a plurality of through holes communicated with the film distribution assembly are formed in the side plate.
As a further optimization of the invention, the cavity is composed of a sealing plate and a frame, the sealing plate is provided with a second caliber matched with the flow equalizing assembly, and the flow equalizing assembly is embedded on the second caliber and communicated with the cavity.
As a further optimization of the invention, a plurality of openings are distributed on the first layer of liquid distribution plate and the second layer of liquid distribution plate.
The falling film evaporator comprises a barrel, wherein a liquid inlet pipe, an air outlet pipe and a baffle are mounted on the barrel, a plurality of heat exchange pipes are arranged in the baffle, the falling film evaporator also comprises the flow equalizing and liquid distributing device, the flow equalizing and liquid distributing device is mounted in the barrel and communicated with the liquid inlet pipe and the air outlet pipe, and the heat exchange pipes are positioned below the flow equalizing and liquid distributing device.
As a further optimization of the invention, the openings of the second layer of liquid distribution plate are uniformly arranged right above each heat exchange tube along the axial direction.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to a liquid flow equalizing and distributing device which comprises a flow equalizing assembly, wherein the flow equalizing assembly comprises a first flow channel, a plurality of baffle plates are arranged in the first flow channel, and the baffle plates are opposite along the first flow channel and are arranged at intervals, so that a falling film evaporator has excellent refrigerant distribution capacity, can uniformly distribute refrigerants and achieve the purpose of efficient refrigeration.
According to the falling film evaporator, the anti-impact platform is arranged in the first flow channel, so that the falling film evaporator has a good refrigerant impact resistance effect.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the drawings.
FIG. 1 is a schematic structural view of a falling film evaporator according to the present invention;
FIG. 2 is a cross-sectional view of a fluid distribution bar according to the present invention;
FIG. 3 is a schematic diagram of a current share assembly according to the present invention;
fig. 4 is a flow diagram of a liquid refrigerant in the flow equalizing assembly according to the present invention.
In the above figures, 1, an inlet connecting pipe; 2. a cylinder body; 3. a current sharing component; 31. a scour prevention platform; 32. a baffle plate; 33. a side plate; 3301. a first side plate; 3302. a second side plate; 34. a sideboard; 35. a base plate; 36. a gas-liquid filter screen; 37. a top cover; 38. a side cover; 41. closing the plate; 42. a frame; 43. a first layer of liquid distribution plate; 44. a second layer of liquid distribution plate; 5. a heat exchange tube; 6. a baffle plate; 7. and an air outlet pipe.
In the drawings, like parts are given like reference numerals. The figures are not drawn to scale.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1-4, the present invention provides a falling film evaporator, which comprises a cylinder 2, wherein a liquid inlet pipe 1, an air outlet pipe 7, a baffle 6 are installed on the cylinder 2, a plurality of heat exchange pipes 5 are arranged in the baffle 6, and the falling film evaporator further comprises a liquid flow equalizing and distributing device, wherein the liquid flow equalizing and distributing device is installed in the cylinder 2 and is communicated with the liquid inlet pipe 1 and the air outlet pipe 7, and the heat exchange pipes 5 are arranged below the liquid flow equalizing and distributing device, so that the purpose of high efficiency refrigeration is achieved by fully utilizing a refrigerant.
This flow equalizing liquid distribution device, including flow equalizing assembly 3, flow equalizing assembly 3 includes first flow channel, install a plurality of baffling boards 32 in the first flow channel, it is a plurality of baffling board 32 along first flow channel is relative, and interval arrangement for falling film evaporator possesses excellent refrigerant distribution ability, can evenly distribute the refrigerant, in order to reach high-efficient cryogenic purpose.
As another embodiment of the present invention, different from the above embodiments, the present embodiment further includes a film distribution assembly 4 communicated with the flow equalizing assembly 3, where the film distribution assembly 4 includes a cavity, and a first layer of liquid distribution plate 43 and a second layer of liquid distribution plate 44 are installed in the cavity, so as to achieve uniform distribution of a refrigerant and effectively enhance a refrigeration effect of the falling film evaporator.
As another embodiment of the present invention, different from the above embodiments, the flow equalizing assembly 3 further includes a second flow channel, and the second flow channel is disposed around the periphery of the first flow channel and is respectively communicated with the first flow channel and the cavity, so as to effectively reduce the flow velocity of the refrigerant, and enable the refrigerant to be uniformly distributed to the cavity of the film distribution assembly 4.
As another embodiment of the present invention, different from the above embodiments, the first flow channel is composed of a side plate 33, a bottom plate 35, and a top cover 37, the second flow channel is composed of a side plate 33, a side plate 34, a bottom plate 35, and a side cover 38, the side plate 33 includes a first side plate 3301 and a second side plate 3302, and the first side plate 3301 and the second side plate 3302 are tightly connected, so as to reduce the flow velocity of the liquid refrigerant, so that the refrigerant can uniformly flow into the film distribution assembly.
As another embodiment of the present invention, different from the above embodiments, the top cover 37 is provided with a second caliber, and the gas-liquid filter 36 is installed on the second caliber, so that a small amount of liquid refrigerant mixed with the gaseous refrigerant is intercepted and enters the first flow channel formed by the baffle plates 32, and the gaseous refrigerant is successfully separated.
As another embodiment of the present invention, different from the above embodiments, the anti-impact platform 31 is installed in the first flow channel, so that when the refrigerant fluid moves to the anti-impact platform, the refrigerant fluid can be rapidly spread out along the circumferential direction of the anti-impact platform, the speed is greatly reduced, and meanwhile, the anti-impact platform has a certain thickness, so as to avoid component damage caused by too large impact; the height of the anti-impact platform is greater than that of the baffle plate, so that the sputtering of liquid refrigerant is effectively avoided; and the sum L1+ L2 of the lengths of the adjacent two baffle plates is greater than the length L3 of the second side plate 3302, so that the flow velocity of the liquid refrigerant is effectively reduced, and the uniform distribution of the refrigerant is ensured.
As another embodiment of the present invention, different from the above embodiments, a first caliber communicated with the second flow channel is provided on the second side plate 3302 facing away from the impingement platform, so as to reduce the flow rate of the liquid refrigerant, so that the refrigerant can uniformly flow into the film distribution assembly.
As another embodiment of the present invention, different from the above embodiments, the side plate 34 is provided with a plurality of through holes communicated with the film distribution assembly 4, so that the refrigerant can uniformly flow into the film distribution assembly.
As another embodiment of the present invention, different from the above embodiments, the cavity is composed of a sealing plate 41 and a frame 42, the sealing plate 41 is provided with a second aperture matched with the flow equalizing component 3, and the flow equalizing component 3 is embedded on the second aperture and is communicated with the cavity, so that the falling film evaporator can uniformly distribute the refrigerant.
As a further optimization of the present invention, a plurality of openings are distributed on the first layer of liquid distribution plate 43 and the second layer of liquid distribution plate 44, and the openings of the second layer of liquid distribution plate 44 are uniformly arranged along the axial direction right above each heat exchange tube, so that a plurality of downward spray flows are formed along the distributed openings by the liquid refrigerant which has undergone multiple flow equalization, and are uniformly distributed on the outer surface of each heat exchange tube, thereby realizing effective heat exchange of the heat exchange tubes.
The working principle of the invention is as follows: refrigerant fluid (gaseous state and liquid coexists) gets into falling film evaporator from feed liquor pipe 1 high speed, when moving to scour protection platform 31, refrigerant fluid spreads out along this scour protection platform circumference rapidly, and speed reduces by a wide margin, and scour protection platform has certain thickness simultaneously, has avoided leading to the part damage because of assaulting too greatly. At this time, the gaseous refrigerant escapes from the gap of the top cover 37 due to the blocking of the baffle plate 32, and a small amount of liquid refrigerant mixed with the gaseous refrigerant is intercepted and then enters the first flow channel formed by the baffle plate 32 due to the gas-liquid filter screen 36, and the gaseous refrigerant is successfully separated. Meanwhile, a large amount of liquid refrigerant flows along a first flow channel formed by the baffle plates 32, after multiple times of baffling, enters a second flow channel formed by the side plates 33, the side plates 34, the bottom plate 35 and the side covers 38 through notches at two ends of the side plates 33, and the liquid refrigerant in the second flow channel enters the film distribution device 4 through the openings in the side plates 34.
When the liquid refrigerant reaches the film distribution device 4 from the anti-impact flow equalizing device 3, the flow velocity of the liquid refrigerant is greatly reduced, and the motion state is close to stability. A large number of openings are distributed on the first liquid distribution plate 43, and the liquid refrigerant flowing through the openings is equalized again to enter the second liquid distribution plate 44. The second layer of liquid distribution plate 44 is uniformly perforated right above each heat exchange tube along the axial direction, and liquid refrigerants which have been subjected to flow equalization for many times form a plurality of strands of downward spraying flows along the distributed perforated holes, and the downward spraying flows are uniformly distributed on the outer surface of each heat exchange tube, so that the purpose of high-efficiency refrigeration is achieved.
Therefore, the flow equalizing and liquid distributing device of the invention performs speed reduction, flow equalization and gas-liquid separation treatment on the refrigerant fluid (gas and liquid coexisting) entering from the liquid inlet pipe 1 at a high speed through the anti-impact flow equalizing assembly 3; the processed liquid refrigerant enters the film distribution assembly 4 below, and can be better and uniformly dripped on the outer surface of the heat exchange tube through the combined action of the first layer of liquid distribution plate 43 and the second layer of liquid distribution plate 44.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (13)
1. A flow equalizing and liquid distributing device is characterized in that: the flow equalizing assembly comprises a first flow channel, a plurality of baffle plates are arranged in the first flow channel, and the baffle plates are opposite to each other along the first flow channel and are arranged at intervals.
2. The fluid distribution equalizing device of claim 1, wherein: the membrane distribution assembly is communicated with the flow equalizing assembly and comprises a cavity, and a first layer of liquid distribution plate and a second layer of liquid distribution plate are mounted in the cavity.
3. The fluid distribution flow straightener of claim 2, wherein: the flow equalizing assembly further comprises a second flow channel, wherein the second flow channel is arranged around the periphery of the first flow channel and is respectively communicated with the first flow channel and the cavity.
4. The fluid distribution flow straightener of claim 3, wherein: the first flow channel is composed of a side plate, a bottom plate and a top cover, the second flow channel is composed of a side plate, a bottom plate and a side cover, the side plate comprises a first side plate and a second side plate, and the first side plate and the second side plate are tightly connected.
5. The fluid distribution equalizing device of claim 4, wherein: and a second caliber is formed in the top cover, and a gas-liquid filter screen is mounted on the second caliber.
6. The fluid distribution equalizing device of claim 1, wherein: an anti-collision platform is further installed in the first flow channel, and the height of the anti-collision platform is smaller than that of the baffle plate.
7. The fluid distribution flow straightener of claim 6, wherein: and a first caliber communicated with the second flow channel is arranged on the oppositely arranged second side plate far away from the impact prevention platform.
8. The fluid distribution equalizing device of claim 4, wherein: the sum L1+ L2 of the lengths of two adjacent baffle plates is greater than the length L3 of the second side plate.
9. The fluid distribution equalizing device of claim 4, wherein: and a plurality of through holes communicated with the film distribution assembly are formed in the side plate.
10. The fluid distribution flow straightener of claim 2, wherein: the cavity body is formed by a sealing plate and a frame, a second caliber matched with the flow equalizing assembly is arranged on the sealing plate, and the flow equalizing assembly is embedded on the second caliber and communicated with the cavity body.
11. The fluid distribution flow straightener of claim 2, wherein: and a plurality of openings are distributed on the first layer of liquid distribution plate and the second layer of liquid distribution plate.
12. The utility model provides a falling liquid film evaporator, includes a barrel, install feed liquor pipe, outlet duct, baffle on the barrel, be arranged with many heat exchange tubes in the baffle, its characterized in that: the liquid distributor according to any one of claims 1 to 11, wherein the liquid distributor is installed in the cylinder and is communicated with the liquid inlet pipe and the gas outlet pipe, and the heat exchange pipe is arranged below the liquid distributor.
13. The falling film evaporator according to claim 12, characterized in that: the openings of the second layer of liquid distribution plate are uniformly arranged right above each heat exchange tube along the axial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211120970.6A CN115523772A (en) | 2022-09-15 | 2022-09-15 | Flow equalizing and liquid distributing device and falling film evaporator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211120970.6A CN115523772A (en) | 2022-09-15 | 2022-09-15 | Flow equalizing and liquid distributing device and falling film evaporator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115523772A true CN115523772A (en) | 2022-12-27 |
Family
ID=84697573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211120970.6A Pending CN115523772A (en) | 2022-09-15 | 2022-09-15 | Flow equalizing and liquid distributing device and falling film evaporator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115523772A (en) |
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2022
- 2022-09-15 CN CN202211120970.6A patent/CN115523772A/en active Pending
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