CN209952256U - Plate-fin heat exchanger device for falling film evaporation - Google Patents

Plate-fin heat exchanger device for falling film evaporation Download PDF

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Publication number
CN209952256U
CN209952256U CN201920395545.5U CN201920395545U CN209952256U CN 209952256 U CN209952256 U CN 209952256U CN 201920395545 U CN201920395545 U CN 201920395545U CN 209952256 U CN209952256 U CN 209952256U
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liquid
plate
heat exchanger
fin heat
guide plate
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CN201920395545.5U
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钱寅国
雷昊
谈硕
刘苗苗
乔玉珍
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HANGZHOU ZHONGTAI CRYOGENIC TECHNOLOGY Co Ltd
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HANGZHOU ZHONGTAI CRYOGENIC TECHNOLOGY Co Ltd
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Abstract

The utility model discloses a plate-fin heat exchanger device for falling film evaporation, which comprises an annular guide plate, an inverted cone-shaped guide plate, a seal head, a liquid seal device and a plate-fin heat exchanger; the liquid oxygen enters the liquid seal device through the annular guide plate and the inverted cone-shaped guide plate. The top of the plate-fin heat exchanger is sealed by a seal head, the top of a liquid seal pipe of the liquid seal device extends out of the seal head to be connected with an outlet at the bottom of the inverted cone-shaped guide plate, and the bottom of the liquid seal pipe is communicated with a main distribution pipe which is horizontally arranged. The main distribution pipe is connected with a plurality of branch distribution pipes, and liquid outlet holes are formed in the bottoms of the main distribution pipe and the branch distribution pipes. The plate-fin heat exchanger is positioned below a liquid distribution area formed by the main distribution pipe and the branch distribution pipes. The bottom of the device shell is provided with a liquid oxygen storage area which is communicated with the exhaust channel. After the device is adopted, the liquid oxygen at the bottom of the heat exchanger has no pressure influence generated by a liquid column, so that the supercooling degree is not needed any more, and the nitrogen can smoothly realize heat transfer to the liquid oxygen, so that the liquid oxygen is evaporated, and the subsequent mass transfer rectification is facilitated.

Description

Plate-fin heat exchanger device for falling film evaporation
Technical Field
The utility model belongs to the heat exchanger field, concretely relates to plate-fin heat exchanger device of falling liquid film evaporation.
Background
At present, a main condensation evaporator commonly used in an oxygen generator is divided into a bath type and a film type, a bath type main cold heat exchange unit is soaked in low-pressure liquid oxygen, and the liquid oxygen is vaporized after heat exchange with nitrogen in a main cold heat exchange channel. The liquid oxygen is also called as thermosyphon-type main cooling because the liquid oxygen continuously self-circulates due to the thermosyphon effect generated by the pressure difference along the height direction in the process of vaporization.
The principle of the membrane type main cooling is that liquid oxygen is conveyed to the top of the membrane type main cooling by means of gravity or a liquid oxygen pump and is uniformly distributed into a channel of a heat exchange unit through a liquid distributor, a layer of liquid membrane flowing downwards is formed on a vertical wall surface of the channel, and the liquid oxygen membrane exchanges heat with gas nitrogen in a nitrogen channel while flowing downwards along the wall surface and is vaporized. Because the evaporation heat transfer surface of the membrane type main cooling is not soaked in liquid oxygen, but exchanges heat through a thin liquid membrane on the heat transfer surface, and static pressure generated by the liquid level of the liquid oxygen does not exist, the average temperature difference of the main cooling can be reduced to 0.7-0.8K from 1.3K, and the pressure at the top of the pressure tower is correspondingly reduced by about 0.02MPa, so that the energy consumption of the air compressor is reduced. The energy saving effect caused by the energy saving method accounts for about 2% -3% of the total energy consumption of the air separation plant, and the amount of the energy saving effect is very considerable.
The heat exchanger adopting membrane evaporation in the market at present is basically a shell-and-tube heat exchanger, the heat exchanger has the defects of low heat transfer efficiency, small specific surface area, large occupied area and the like, and the plate-fin heat exchanger has the advantages of high heat transfer efficiency, compact structure, lightness, strong adaptability and the like.
Disclosure of Invention
The utility model aims at overcoming the not enough of current structure, provide a falling film evaporation's plate-fin heat exchanger device.
The purpose of the utility model is realized by the following method:
a plate-fin heat exchanger device for falling film evaporation comprises an annular guide plate, an inverted cone-shaped guide plate, a seal head, a liquid seal device and a plate-fin heat exchanger; the top of the device shell is provided with a liquid oxygen inlet, and the annular guide plate is fixed at the liquid oxygen inlet and used for converging the inflowing liquid oxygen; the inverted cone-shaped guide plate is positioned below the bottom opening of the annular guide plate and is used for receiving the converged liquid oxygen; an exhaust channel is reserved between the inverted cone-shaped guide plate and the annular guide plate; the top of the plate-fin heat exchanger is sealed by a seal head, and the liquid sealing device is arranged in the seal head; the liquid seal device comprises a liquid seal pipe, a main distribution pipe and branch distribution pipes, wherein the top of the liquid seal pipe extends out of a seal head and is connected with an outlet at the bottom of the inverted cone-shaped guide plate, and the bottom of the liquid seal pipe is communicated with the horizontally arranged main distribution pipe; the main distribution pipe is connected with a plurality of branch distribution pipes, and liquid outlet holes are formed in the bottoms of the main distribution pipe and the branch distribution pipes; the plate-fin heat exchanger is positioned below a liquid distribution area formed by the main distribution pipe and the branch distribution pipes; the bottom of the device shell is provided with a liquid oxygen storage area which is communicated with the exhaust channel.
Preferably, the number of the branch distribution pipes is 4, and two branch distribution pipes are symmetrically arranged on two sides of the main distribution pipe respectively.
Preferably, the liquid outlet holes are densely formed at the bottoms of the main distribution pipe and the branch distribution pipes.
Preferably, the transverse flow guide area of the inverted cone-shaped guide plate is larger than the liquid outlet area of the bottom opening of the annular guide plate.
Preferably, the liquid seal pipe is in an upright state, and the main distribution pipe and the branch distribution pipes are in a horizontal state.
Preferably, the top of the annular guide plate is the same as the liquid oxygen inlet in size, and the annular guide plate and the liquid oxygen inlet are tightly fixed.
Preferably, the end socket is in a hemispherical shell shape.
Preferably, the end of the branch distribution pipe, which faces away from the main distribution pipe, is sealed.
The utility model discloses a plate-fin heat exchanger device of falling liquid film formula evaporation has carried out the membrane formula evaporation improvement with plate-fin heat exchanger, adopts the device after, and the liquid oxygen of heat exchanger bottom does not have the pressure influence that the liquid column produced to no longer there is the super-cooled rate, and nitrogen gas can realize the heat transfer to liquid oxygen smoothly, makes the liquid oxygen evaporate, and carries out subsequent mass transfer rectification.
Drawings
Fig. 1 is a schematic diagram of a plate-fin heat exchanger structure for falling film evaporation;
FIG. 2 is a front view of the structure of the liquid seal apparatus;
FIG. 3 is a side view of the structure of the liquid seal apparatus;
FIG. 4 is a top view of the liquid seal apparatus;
reference numbers in the figures: the device comprises an annular guide plate 1, an inverted cone-shaped guide plate 2, a liquid seal pipe 3, a main distribution pipe 4, branch distribution pipes 5, liquid outlet holes 6, end sockets 7, a liquid oxygen storage region 8, oxygen 9 and a plate-fin heat exchanger 10.
Detailed Description
The invention will be further elucidated and described with reference to the drawings and embodiments. The utility model discloses in the technical characteristics of each embodiment under the prerequisite that does not conflict each other, all can carry out corresponding combination.
As shown in fig. 1, the main structure of the plate-fin heat exchanger device for falling film evaporation in this embodiment includes a ring-shaped guide plate 1, an inverted cone-shaped guide plate 2, a head 7, a liquid seal device, and several parts of a plate-fin heat exchanger 10.
The whole device is positioned in the middle of the upper tower and the lower tower of the air separation rectifying tower, and has the functions of evaporating liquid oxygen of the upper tower and condensing nitrogen of the lower tower. The top of the device shell is provided with a liquid oxygen inlet, and liquid oxygen L of the upper tower flows in from the liquid oxygen inlet. In order to collect and converge the liquid oxygen flowing in the liquid oxygen inlet, an annular guide plate 1 is fixed at the liquid oxygen inlet, the top of the annular guide plate 1 is the same as the liquid oxygen inlet in size, and the annular guide plate 1 and the liquid oxygen inlet are tightly fixed. The liquid oxygen flowing in from the liquid oxygen inlet flows out from the outlet of the annular guide plate 1 to realize confluence. And an inverted cone-shaped guide plate 2 is arranged below the bottom opening of the annular guide plate 1 and is used for receiving the converged liquid oxygen. The horizontal water conservancy diversion region of back taper guide plate 2 needs to be greater than the bottom opening play liquid area of annular guide plate 1, and the diameter of 2 open-tops of back taper guide plate will be greater than the bottom opening diameter of annular guide plate 1 promptly for the liquid oxygen that annular guide plate 1 flowed out can be got into back taper guide plate 2 by the water conservancy diversion completely. Meanwhile, in consideration of the fact that oxygen below the reverse cone-shaped guide plate needs to be discharged into the upper tower again, a certain height difference needs to be formed between the reverse cone-shaped guide plate 2 and the annular guide plate 1, and an exhaust channel is reserved.
The plate-fin heat exchanger 10 is arranged in the device shell, and the top of the plate-fin heat exchanger 10 is sealed through a hemispherical shell-shaped end socket 7. The liquid seal device is arranged in the seal head 7, and as shown in fig. 2-4, the specific structure of the liquid seal device comprises a liquid seal pipe 3, a main distribution pipe 4 and branch distribution pipes 5. The top of the liquid seal pipe 3 extends out of the seal head 7 to be connected with the bottom outlet of the inverted cone-shaped guide plate 2, and the bottom is communicated with the main distribution pipe 4 which is horizontally arranged. The main distributing pipe 4 is connected with 4 branch distributing pipes 5, and one end of each branch distributing pipe 5 departing from the main distributing pipe 4 is sealed. Liquid outlet holes 6 are formed at the bottoms of the main distribution pipe 4 and the branch distribution pipes 5. The liquid seal pipe 3 is in an upright state, the main distributing pipe 4 and the branch distributing pipes 5 are in a horizontal state, and two branch distributing pipes 5 are symmetrically arranged on two sides of the main distributing pipe 4 respectively. From this the liquid oxygen of back taper guide plate 2 department can converge and get into liquid seal pipe 3, then follow main distributing pipe 4 of liquid seal pipe 3 entering below, in the reposition of redundant personnel to a distributing pipe 5, flow out through play liquid hole 6, form a cloth liquid region that has certain coverage. The plate-fin heat exchanger 10 is positioned below a liquid distribution area formed by the main distribution pipe 4 and the branch distribution pipes 5, liquid oxygen can be dispersed into the flow guide pieces of the plate-fin heat exchanger 10, a layer of liquid film flowing downwards is formed on the vertical wall surface of the heat exchange unit channel, and the liquid oxygen film exchanges heat with gas nitrogen input by a lower tower in the nitrogen channel while flowing downwards along the wall surface, and is vaporized. Liquid oxygen is discharged from the bottom of the plate-fin heat exchanger 10, a liquid oxygen storage area 8 is arranged at the bottom of the shell of the device, the liquid oxygen storage area 8 needs to be communicated with an exhaust channel, and gasified oxygen 9 can flow back to the upper tower through the exhaust channel along the gas path direction indicated by the arrow G.
The utility model discloses a work flow as follows:
1. liquid oxygen from the upper tower enters the liquid seal device in the seal head 7 through the annular guide plate 1 and the inverted cone-shaped guide plate 2. In the device, the gas evaporated in the plate-fin heat exchanger 10 cannot flow upwards through the liquid seal device and the seal head 7 with sealed top, so that the gas is forced to flow downwards, and the evaporated gas is ensured not to flow upwards to damage the formation of a liquid film;
2. after entering the sealed end socket 7, liquid oxygen enters the branch distribution pipes 5 through the main distribution pipe 4 at a higher speed (about 2m/s) to form a liquid seal;
3. the liquid oxygen flows out from the liquid outlet holes 6 in the branch distribution pipes 5. Because the liquid outlet holes 6 are densely arranged at the bottoms of the main distribution pipe 4 and the branch distribution pipes 5, the outflow speed can be ensured to be lower (lower than 1m/s) by calculating the number of the liquid outlet holes 6, and then the liquid flows into the flow guide plates of the plate-fin heat exchanger 10 uniformly to finish falling film flow;
4. due to the top liquid seal structure, oxygen at the bottom of the heat exchanger has to be discharged from the bottom of the heat exchanger, enter the liquid oxygen storage zone 8 and then return to the upper column from the space beside.
The biggest advantage of this structure is that the advantage that has combined plate-fin heat exchanger and falling film evaporator heat exchanger (shell and tube type), need not submerge in liquid oxygen, liquid oxygen utilizes self gravity to flow and accomplishes the evaporation in the heat exchanger fin, and the liquid level of liquid oxygen also need not too high simultaneously, has alleviateed the bearing capacity of lower tower head to reduce the operation weight of whole equipment, saved the weight of a considerable part equipment, reduced equipment cost, improved economic benefits.
The above-mentioned embodiments are merely a preferred embodiment of the present invention, but it is not intended to limit the present invention. Various changes and modifications can be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, all the technical schemes obtained by adopting the mode of equivalent replacement or equivalent transformation fall within the protection scope of the utility model.

Claims (8)

1. A plate-fin heat exchanger device for falling film evaporation is characterized by comprising an annular guide plate (1), an inverted conical guide plate (2), a seal head (7), a liquid seal device and a plate-fin heat exchanger (10);
the top of the device shell is provided with a liquid oxygen inlet, and the annular guide plate (1) is fixed at the liquid oxygen inlet and used for converging the inflowing liquid oxygen; the inverted cone-shaped guide plate (2) is positioned below the bottom opening of the annular guide plate (1) and is used for receiving the converged liquid oxygen; an exhaust channel is reserved between the inverted cone-shaped guide plate (2) and the annular guide plate (1);
the top of the plate-fin heat exchanger (10) is sealed by an end enclosure (7), and the liquid sealing device is arranged in the end enclosure (7); the liquid seal device comprises a liquid seal pipe (3), a main distribution pipe (4) and branch distribution pipes (5), wherein the top of the liquid seal pipe (3) extends out of a seal head (7) to be connected with an outlet at the bottom of the inverted cone-shaped guide plate (2), and the bottom of the liquid seal pipe is communicated with the horizontally arranged main distribution pipe (4); the main distribution pipe (4) is connected with a plurality of branch distribution pipes (5), and the bottoms of the main distribution pipe (4) and the branch distribution pipes (5) are provided with liquid outlet holes (6); the plate-fin heat exchanger (10) is positioned below a liquid distribution area formed by the main distribution pipe (4) and the branch distribution pipes (5); the bottom of the device shell is provided with a liquid oxygen storage area (8), and the liquid oxygen storage area (8) is communicated with the exhaust channel.
2. The falling film evaporation plate fin heat exchanger device according to claim 1, characterized in that the number of the branch distribution pipes (5) is 4, and two branch distribution pipes are symmetrically arranged on both sides of the main distribution pipe (4).
3. The plate-fin heat exchanger device of falling film evaporation according to claim 1, characterized in that the liquid outlet holes (6) are densely arranged at the bottom of the main distribution pipe (4) and the branch distribution pipes (5).
4. The falling film evaporation plate-fin heat exchanger device according to claim 1, wherein the lateral flow guiding area of the inverted cone-shaped flow guiding plate (2) is larger than the bottom opening liquid outlet area of the annular flow guiding plate (1).
5. The plate-fin heat exchanger device of falling film evaporation according to claim 1, characterized in that the liquid seal pipe (3) is in an upright state, and the main distribution pipe (4) and the branch distribution pipes (5) are in a horizontal state.
6. The falling film evaporation plate fin heat exchanger device according to claim 1, wherein the top of the ring-shaped baffle (1) is the same size as the liquid oxygen inlet, and the two are tightly fixed.
7. The falling film evaporation plate-fin heat exchanger device according to claim 1, characterized in that the end closures (7) are hemispherical shells.
8. The falling film evaporation plate fin heat exchanger device according to claim 1, characterized in that the end of the branch distribution pipe (5) facing away from the main distribution pipe (4) is sealed.
CN201920395545.5U 2019-03-26 2019-03-26 Plate-fin heat exchanger device for falling film evaporation Active CN209952256U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920395545.5U CN209952256U (en) 2019-03-26 2019-03-26 Plate-fin heat exchanger device for falling film evaporation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920395545.5U CN209952256U (en) 2019-03-26 2019-03-26 Plate-fin heat exchanger device for falling film evaporation

Publications (1)

Publication Number Publication Date
CN209952256U true CN209952256U (en) 2020-01-17

Family

ID=69240263

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201920395545.5U Active CN209952256U (en) 2019-03-26 2019-03-26 Plate-fin heat exchanger device for falling film evaporation

Country Status (1)

Country Link
CN (1) CN209952256U (en)

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