CN108489307B - Plate-fin heat exchanger - Google Patents

Plate-fin heat exchanger Download PDF

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Publication number
CN108489307B
CN108489307B CN201810067084.9A CN201810067084A CN108489307B CN 108489307 B CN108489307 B CN 108489307B CN 201810067084 A CN201810067084 A CN 201810067084A CN 108489307 B CN108489307 B CN 108489307B
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fin
heat exchange
liquid
phase medium
vapor
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CN108489307A (en
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陈高飞
公茂琼
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Technical Institute of Physics and Chemistry of CAS
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Technical Institute of Physics and Chemistry of CAS
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/02Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations

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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

A plate-fin heat exchanger comprises a heat exchange core body formed by stacking at least two fluid channels, wherein an included angle is formed between the plane of a partition plate between every two adjacent fluid channels and the horizontal plane, a medium inlet, a heat exchange fin and a medium outlet are sequentially arranged in each fluid channel from one end to the other end, each medium outlet comprises a first liquid-phase medium outlet and a vapor-phase medium outlet, the first liquid-phase medium outlet is arranged at the lower part of each fluid channel, and the vapor-phase medium outlet is arranged at the upper part of each fluid channel. In the plate-fin heat exchanger, after the medium enters, the gravitational potential energy difference is generated due to the height difference, and the liquid phase carried by the vapor-liquid two-phase medium or the liquid phase generated by condensation of the vapor-phase medium in the heat exchange process tends to settle towards the gravity direction due to the action of gravity, so that the vapor-phase medium and the liquid-phase medium respectively flow out of the plate-fin heat exchanger. The plate-fin heat exchanger has the heat exchange function and the gas-liquid separation function, is simple in structure, saves the cost and can reduce the occupied space of the structure.

Description

Plate-fin heat exchanger
Technical Field
The invention relates to the technical field of heat exchangers, in particular to a plate-fin heat exchanger.
Background
The existing chemical and heat energy fields widely relate to medium (vapor phase, liquid phase or vapor-liquid two-phase) flow. When a single-phase (vapor phase or liquid phase) medium undergoes heat exchange or pressure change, a vapor-liquid two-phase flow may be formed, and as the density, viscosity and other physical properties of the vapor phase and the liquid phase are remarkably different and have different characteristics and functions in a chemical/thermal process, the vapor-liquid two-phase flow needs to be subjected to phase separation to output the vapor phase and the liquid phase medium respectively.
In a particular example, in the field of natural gas liquefaction, when a natural gas feed gas is initially cooled to-50 ℃, heavy hydrocarbon components contained in the natural gas feed gas are condensed into a liquid phase to form a vapor-liquid two-phase flow with methane gas. If vapor-liquid separation is not carried out, the vapor-liquid two-phase flow is continuously cooled to low temperature, so that partial liquid phase is solidified to block a heat exchanger channel, and the system is shut down. Therefore, the liquid-phase heavy hydrocarbon component and the methane gas need to be subjected to vapor-liquid separation, the separated methane gas enters a subsequent flow, and the liquid-phase heavy hydrocarbon component is led out of the system for additional treatment.
The traditional plate-fin heat exchanger usually adopts a gas-liquid separator at the downstream of the heat exchanger for gas-liquid separation after medium heat exchange, and the heat exchanger and the gas-liquid separator are both pressure vessels and need to occupy space. Therefore, the problems of high cost, complexity and large occupied space exist.
Disclosure of Invention
In view of the above, there is a need for a plate-fin heat exchanger with low cost, simple structure and small space occupation, which can perform gas-liquid separation.
A plate-fin heat exchanger comprises a heat exchange core body formed by stacking at least two fluid channels, wherein an included angle is formed between the plane of a partition plate between every two adjacent fluid channels and the horizontal plane, a medium inlet, a heat exchange fin and a medium outlet are sequentially arranged in each fluid channel from one end to the other end, each medium outlet comprises a first liquid-phase medium outlet and a vapor-phase medium outlet, the first liquid-phase medium outlet is formed in the lower portion of each fluid channel, and the vapor-phase medium outlet is formed in the upper portion of each fluid channel.
In one embodiment, the plane of the partition plate between two adjacent fluid channels forms a right angle with the horizontal plane.
In one embodiment, a first guide fin is further arranged between the medium inlet and the heat exchange fins, and the medium entering the plate-fin heat exchanger from the medium inlet flows into the channel between the heat exchange fins through the guide effect of the first guide fin.
In one embodiment, a second guide fin is arranged between the vapor-phase medium outlet and the heat exchange fins, vapor-phase medium in the channel between the heat exchange fins flows out of the plate-fin heat exchanger from the vapor-phase medium outlet through the guide action of the second guide fin, a third guide fin is further arranged between the first liquid-phase medium outlet and the heat exchange fins, and liquid-phase medium in the channel between the heat exchange fins flows out of the plate-fin heat exchanger from the first liquid-phase medium outlet through the guide action of the third guide fin.
In one embodiment, the heat exchanging fins are saw-toothed fins, perforated fins, or corrugated fins with slits and perforations.
In one embodiment, the heat exchange fins are inclined obliquely downwards to the direction close to the horizontal plane to form an included angle smaller than 90 degrees with the horizontal plane.
In one embodiment, the heat exchange fins include a first section of heat exchange fin close to the medium inlet, a second section of heat exchange fin close to the first liquid-phase medium outlet, and a third section of heat exchange fin close to the vapor-phase medium outlet, the first section of heat exchange fin is inclined obliquely downwards in a direction close to the horizontal plane to form an included angle smaller than 90 degrees with the horizontal plane, the second section of heat exchange fin is arranged in parallel with the horizontal plane, and the third section of heat exchange fin is inclined obliquely upwards in a direction away from the horizontal plane to form an included angle smaller than 90 degrees with the horizontal plane.
In one embodiment at least one of the outlet for the vapour-phase medium and the outlet for the first liquid-phase medium is provided with a throttle regulating valve for controlling the division ratio of the medium flows of the outlet for the vapour-phase medium and the outlet for the first liquid-phase medium.
In one embodiment, the vapor-phase medium outlet port is provided at an end portion of one end of the flow channel, and the first liquid-phase medium outlet port is provided at a bottom portion of one end of the flow channel.
In one embodiment, the bottom of the plate-fin heat exchanger is also provided with a second liquid-phase medium outlet.
A plate-fin heat exchanger comprises a heat exchange core body formed by stacking at least two fluid channels, wherein a medium inlet and a liquid-phase medium outlet are respectively formed in two sides of one end of each fluid channel, heat exchange fins are arranged in the middle of each fluid channel and are perpendicular to the horizontal plane, a vapor-phase medium outlet is formed in the other end of each fluid channel, first guide fins are arranged between the medium inlets and the heat exchange fins, second guide fins are arranged between the vapor-phase medium outlets and the heat exchange fins, and third guide fins are arranged between the liquid-phase medium outlets and the heat exchange fins.
In the plate-fin heat exchanger, after the medium enters the plate-fin heat exchanger from the medium inlet, the medium in the fluid channel generates gravitational potential energy difference due to the height difference, and the liquid phase carried by the vapor-liquid two-phase medium or the liquid phase generated by condensation of the vapor-phase medium in the heat exchange process tends to settle towards the gravity direction due to the action of gravity and is gathered at the bottom of the fluid channel, while the vapor-phase medium flows above the liquid-phase medium, so that the vapor-phase medium and the liquid-phase medium respectively flow out of the plate-fin heat exchanger. Therefore, the plate-fin heat exchanger has the heat exchange function and also has the gas-liquid separation function. The plate-fin heat exchanger is simple in structure, saves cost and can reduce occupied space of the structure.
Drawings
Fig. 1 is a schematic structural diagram of a plate-fin heat exchanger according to an embodiment;
FIG. 2 is a schematic structural diagram of another embodiment of a plate-fin heat exchanger;
FIG. 3 is a schematic structural diagram of another embodiment of a plate-fin heat exchanger;
FIG. 4 is a schematic structural diagram of another embodiment of a plate fin heat exchanger;
FIG. 5 is a schematic structural diagram of another embodiment of a plate fin heat exchanger;
fig. 6 is a schematic structural diagram of another embodiment of a plate-fin heat exchanger.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the plate fin heat exchanger of an embodiment includes a heat exchange core formed by stacking at least two fluid passages 100, a plane of a partition plate between two adjacent fluid passages 100 forms an included angle with a horizontal plane, a medium inlet 10, a heat exchange fin 20 and a medium outlet are sequentially provided in the fluid passages 100 from one end to the other end, wherein the medium outlet includes a first liquid-phase medium outlet 32 and a vapor-phase medium outlet 34, the first liquid-phase medium outlet 32 is provided at a lower portion of the fluid passage 100, and the vapor-phase medium outlet 34 is provided at an upper portion of the fluid passage 100.
In the plate-fin heat exchanger, an included angle is formed between the plane of the partition plates between the fluid channels 100 and the horizontal plane, and after a medium enters the plate-fin heat exchanger from the medium inlet 10, the medium in the fluid channels 100 is generated due to the height differenceThe gravitational potential energy difference, and the vapor-liquid phase separation velocity V of the vapor-liquid two-phase flow is calculated according to the structural characteristics of the heat exchange fins 20 in the fluid channel 100, the physical properties and the flow parameters of the fluiddThe fluid medium to be subjected to vapor-liquid separation is caused to flow in the fluid passage 100 at a flow velocity V < VdThe liquid phase carried by the vapor-liquid two-phase medium or the liquid phase generated by condensation of the vapor-phase medium during the heat exchange process tends to settle toward the direction of gravity due to the action of gravity and is collected at the bottom of the fluid channel 100, while the vapor-phase medium flows above the liquid-phase medium, so that the vapor-phase medium and the liquid-phase medium flow out of the plate-fin heat exchanger from the vapor-phase medium outlet 34 and the first liquid-phase medium outlet 32, respectively. Therefore, the plate-fin heat exchanger has the heat exchange function and also has the gas-liquid separation function. Therefore, the plate-fin heat exchanger is simple in structure, saves cost and can reduce the space occupation of the structure.
The plate-fin heat exchanger makes full use of the cold trapping effect (the wall surface of the heat exchanger with lower temperature than the medium can promote the adsorption and aggregation of liquid-phase medium on the wall surface) in the vapor-liquid separation process, and can obtain better vapor-liquid separation effect.
In one embodiment, the plane of the partition between two adjacent fluid channels 100 forms a right angle with the horizontal plane. That is, the partition between the adjacent two fluid passages 100 is disposed perpendicular to the horizontal plane.
In one embodiment, the heat exchanging fins 20 may be saw-tooth fins, perforated fins with high perforation rate, or corrugated fins with proper cuts and perforations, or other novel fins that facilitate vapor-liquid phase separation. The heat exchange fins 20 are designed to have the above structure, which is advantageous for vapor-liquid separation.
In the plate-fin heat exchanger, the heat exchange fins 20 are saw-tooth fins or other fins beneficial to cross flow, and the medium is self-distributed in the fluid channel 100. Where the fluid passage 100 is not provided with a medium inlet and a medium outlet, a passage seal 40 is provided for sealing the medium in the fluid passage 100.
Referring to fig. 2, in one embodiment, a first guide fin 50 is further disposed between the medium inlet 10 and the heat exchange fins 20 of the plate-fin heat exchanger, and a fluid entering the plate-fin heat exchanger from the medium inlet 10 flows into a channel between the heat exchange fins 20 by the guide effect of the first guide fin 50.
A second guide fin 60 is provided between the vapor-phase medium outlet 34 and the heat exchange fin 20. A third guide fin 70 is arranged between the first liquid-phase medium outlet 32 and the heat exchange fin 20. The vapor-phase medium in the channels between the heat exchange fins 20 flows out of the plate-fin heat exchanger from the vapor-phase medium outlet 34 by the flow guiding action of the second flow guiding fins 60. The liquid-phase medium in the channels between the heat exchange fins 20 flows out of the plate-fin heat exchanger from the first liquid-phase medium outlet 32 by the flow guiding action of the third flow guiding fins 70.
Referring to fig. 3, in one embodiment, the heat exchange fins 20 of the plate-fin heat exchanger are inclined downward toward the horizontal plane to form an included angle smaller than 90 degrees with the horizontal plane. This arrangement is more advantageous for the deposition of the liquid-phase medium toward the bottom of the fluid channel 100.
Referring to FIG. 4, in one embodiment, the heat exchange fins within the fluid channel 100 are arranged in segments. Specifically, the heat exchange fins include a first section of heat exchange fins 22 adjacent to the medium inlet 10, a second section of heat exchange fins 24 adjacent to the first liquid-phase medium outlet 32, and a third section of heat exchange fins 26 adjacent to the vapor-phase medium outlet 34. The first section of heat exchange fins 22 incline obliquely downwards towards the direction close to the horizontal plane to form an included angle smaller than 90 degrees with the horizontal plane. The second section of heat exchange fins 24 are arranged parallel to the horizontal plane. The third section of heat exchange fins 26 is inclined obliquely upwards in the direction away from the horizontal plane to form an included angle smaller than 90 degrees with the horizontal plane. The inclined downward inclination of the first section of heat exchange fins 22 toward the horizontal plane is more favorable for the deposition of the liquid-phase medium toward the bottom of the fluid channel 100. The second stage heat exchange fins 24 are disposed parallel to the horizontal plane, and can guide the liquid-phase medium to smoothly flow to the first liquid-phase medium outlet 32 at the bottom of the fluid channel 100. The third section of heat exchange fins 26 are inclined upwards in a direction away from the horizontal plane, so that the flow resistance of the vapor-phase medium is reduced.
In one embodiment at least one of the outlet 34 for vapour-phase medium and the outlet 32 for first liquid-phase medium is provided with a throttle regulating valve (not shown) for controlling the division ratio of the medium flow rates of the outlet 34 for vapour-phase medium and the outlet 32 for first liquid-phase medium. That is, a throttle regulating valve may be provided at the vapor-phase medium outlet 34 or the first liquid-phase medium outlet 32 to control the medium distribution ratio of the vapor-phase medium outlet 34 and the first liquid-phase medium outlet 32. Alternatively, flow rate regulating valves may be provided at both the vapor-phase medium outlet 34 and the first liquid-phase medium outlet 32 to regulate the flow rate distribution at both the vapor-phase medium outlet 34 and the first liquid-phase medium outlet 32.
In the embodiment shown in fig. 1, the vapor-phase medium outlet 34 is provided at the end of one end of the fluid passage 100. The first liquid-phase medium outlet 32 is provided at the bottom of one end of the flow channel 100 to facilitate the outflow of the liquid-phase medium from the flow channel 100.
Referring to fig. 5, in one embodiment, the bottom of the plate-fin heat exchanger is further provided with two second liquid-phase medium outlets 36, and the number of the second liquid-phase medium outlets 36 is two. It will be appreciated that the number of second liquid-phase medium outlets 36 may be set as desired. Through set up a plurality of liquid phase medium exports at plate fin heat exchanger's bottom, the medium is in the cooling process, continuously produces the condensate, subsides to fluid passage 100 bottom, through the liquid phase medium export of each grade, in time discharges plate fin heat exchanger.
Referring to fig. 6, another embodiment of a plate-fin heat exchanger includes a heat exchange core formed by stacking at least two fluid passages 200, wherein two sides of one end of each fluid passage 200 are respectively provided with a medium inlet 210 and a liquid-phase medium outlet 220, a heat exchange fin 230 is arranged in the middle of each fluid passage 200, the heat exchange fin 230 is perpendicular to a horizontal plane, the other end of each fluid passage 200 is provided with a vapor-phase medium outlet 240, a first guide fin 250 is arranged between the medium inlet 210 and the heat exchange fin 230, a second guide fin 270 is arranged between the vapor-phase medium outlet 240 and the heat exchange fin 230, and a third guide fin 260 is arranged between the liquid-phase medium outlet 220 and the heat exchange fin 230. Where the fluid passage 200 is not provided with a medium inlet and a medium outlet, a passage seal 280 is provided for sealing the medium in the fluid passage 100.
In the plate fin heat exchanger shown in fig. 6, the main flow direction of the medium in the plate fin heat exchanger is from bottom to top, the direction of the heat exchange fins 230 in the plate fin heat exchanger is also arranged in a vertical direction, the medium enters the plate fin heat exchanger from one side of the bottom of the fluid channel 200, the vapor-phase medium flows out from the top of the fluid channel 200, and the liquid-phase medium flows out of the plate fin heat exchanger from the other side of the bottom of the fluid channel 200. Therefore, the plate-fin heat exchanger has the heat exchange function and also has the gas-liquid separation function. Therefore, the plate-fin heat exchanger is simple in structure, saves cost and can reduce the space occupation of the structure.
The plate-fin heat exchanger can be applied to a natural gas liquefaction process. In the natural gas liquefaction process flow, the natural gas feed gas contains heavy hydrocarbon components, and if the natural gas feed gas directly enters a low-temperature stage, the heavy hydrocarbon components can be solidified to block a heat exchanger. By using the plate-fin heat exchanger, a heavy hydrocarbon gas-liquid separator is not required to be arranged in the natural gas liquefaction cold box, and condensate generated in the cooling process of the natural gas feed gas is separated from the plate-fin heat exchanger.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (4)

1. A plate-fin heat exchanger is characterized by comprising a heat exchange core body formed by stacking at least two fluid channels, wherein the plane of a partition plate between every two adjacent fluid channels forms an included angle with the horizontal plane, a medium inlet, a heat exchange fin and a medium outlet are sequentially arranged in each fluid channel from one end to the other end, each medium outlet comprises a first liquid-phase medium outlet and a vapor-phase medium outlet, the first liquid-phase medium outlet is arranged at the lower part of each fluid channel, and the vapor-phase medium outlet is arranged at the upper part of each fluid channel; a first guide fin is arranged between the medium inlet and the heat exchange fins, and a medium entering the plate-fin heat exchanger from the medium inlet flows into a channel between the heat exchange fins under the guide action of the first guide fin; a second guide fin is arranged between the vapor-phase medium outlet and the heat exchange fins, vapor-phase medium in a channel between the heat exchange fins flows out of the plate-fin heat exchanger from the vapor-phase medium outlet under the guide action of the second guide fin, a third guide fin is also arranged between the first liquid-phase medium outlet and the heat exchange fins, and liquid-phase medium in a channel between the heat exchange fins flows out of the plate-fin heat exchanger from the first liquid-phase medium outlet under the guide action of the third guide fin; the heat exchange fins comprise a first section of heat exchange fin close to the medium inlet, a second section of heat exchange fin close to the first liquid-phase medium outlet and a third section of heat exchange fin close to the vapor-phase medium outlet, the first section of heat exchange fin slants obliquely downwards in a direction close to the horizontal plane to form an included angle smaller than 90 degrees with the horizontal plane, the second section of heat exchange fin is arranged in parallel with the horizontal plane, and the third section of heat exchange fin slants obliquely upwards in a direction far away from the horizontal plane to form an included angle smaller than 90 degrees with the horizontal plane.
2. The plate fin heat exchanger of claim 1, wherein the heat exchange fins are saw-tooth fins, perforated fins, or corrugated fins with slits and perforations.
3. The plate fin heat exchanger of claim 1, wherein at least one of the outlet for the vapor phase medium and the outlet for the first liquid phase medium is provided with a throttle regulating valve for controlling the division ratio of the medium flow rates of the outlet for the vapor phase medium and the outlet for the first liquid phase medium.
4. The plate fin heat exchanger of claim 1, wherein the bottom of the plate fin heat exchanger is further provided with a second liquid phase medium outlet.
CN201810067084.9A 2018-01-23 2018-01-23 Plate-fin heat exchanger Active CN108489307B (en)

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Application Number Priority Date Filing Date Title
CN201810067084.9A CN108489307B (en) 2018-01-23 2018-01-23 Plate-fin heat exchanger

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Application Number Priority Date Filing Date Title
CN201810067084.9A CN108489307B (en) 2018-01-23 2018-01-23 Plate-fin heat exchanger

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CN108489307B true CN108489307B (en) 2020-09-25

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112944306B (en) * 2019-12-11 2022-07-26 中国科学院大连化学物理研究所 Water vaporizer structure

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101458044B (en) * 2008-12-31 2011-02-09 张伟君 Highly effective complete aluminum alloy heat exchanger
CN202719906U (en) * 2012-07-16 2013-02-06 无锡市豫达换热器有限公司 Plate-type heat exchanger
CN104990433B (en) * 2015-06-04 2017-01-25 中国科学院理化技术研究所 Plate-fin heat exchanger
CN105716440B (en) * 2015-12-18 2017-08-01 广东工业大学 A kind of plate-type condenser with gas-liquid separating function
CN105651085B (en) * 2016-01-26 2017-10-27 睿能太宇(沈阳)能源技术有限公司 A kind of full-welding plate-type heat exchanger
CN105737647B (en) * 2016-03-22 2017-11-03 江苏远卓设备制造有限公司 A kind of plate type heat exchanger for steam-water separation
CN205679094U (en) * 2016-06-21 2016-11-09 山东豪迈机械制造有限公司 A kind of heat-exchanger rig with vapor-liquid separation
CN106440886A (en) * 2016-09-09 2017-02-22 中国科学院理化技术研究所 Plate-fin heat exchanger
CN107137950B (en) * 2017-07-06 2019-05-17 杭州中泰深冷技术股份有限公司 A kind of overhead condensation separator

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